CN110196657B - Common voltage generation circuit, common voltage generation method and touch display panel - Google Patents
Common voltage generation circuit, common voltage generation method and touch display panel Download PDFInfo
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- CN110196657B CN110196657B CN201910430298.2A CN201910430298A CN110196657B CN 110196657 B CN110196657 B CN 110196657B CN 201910430298 A CN201910430298 A CN 201910430298A CN 110196657 B CN110196657 B CN 110196657B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
The invention discloses a public voltage generating circuit and a public voltage generating method using the same, wherein the method comprises the steps of firstly presetting public voltage, then detecting and recording real-time change waveform of actual voltage on a touch electrode under the environment of the preset public voltage, and calculating optimized public voltage waveform by combining the preset waveform and factors such as delay of a panel signal transmission system, so that the actual voltage waveforms of the touch electrode subjected to Gate couples in all rows are consistent, thereby improving the cross grain problem near the interface of the touch electrode, and simultaneously inhibiting voltage fluctuation caused by other factors such as signal interference; the invention also discloses a touch display panel comprising the common voltage generating circuit.
Description
Technical Field
The invention relates to the technical field of display, in particular to a common voltage generation circuit, a common voltage generation method and a touch display panel.
Background
The embedded touch screen technology can not only improve the integration level of the panel to reduce the cost, but also better meet the requirements of users on lightness and thinness of electronic equipment. As shown in fig. 1, the conventional in-cell touch screen technology generally divides a common electrode into small blocks as touch electrodes (sensors) 11, each corresponding to a plurality of pixel units, and a driving chip 13(IC) supplies a touch signal to the touch electrodes through touch signal transmission lines 12.
Fig. 2 is a schematic structural diagram of two adjacent touch electrodes 12, fig. 3 is a waveform of a common voltage signal corresponding to one touch electrode 12 in the touch display panel, and fig. 3 shows a variation of the common voltage from the upper edge to the middle line and then to the edge of the touch electrode at a certain time from left to right, and correspondingly, fig. 3 also shows waveforms of scanning signals corresponding to pixel units at the upper edge, the middle line and the lower edge of the touch electrode. In a conventional touch display panel, an overlap capacitor (Gate Couple) exists between a scan line and a touch electrode, and when a voltage on the scan line jumps, the voltage on the touch electrode jumps due to coupling. Referring to fig. 2 and fig. 3, a Couple caused by falling of a scanning signal (e.g. Gn) of a scanning line in the middle of the touch electrode is cancelled by a Couple caused by rising of a scanning signal (e.g. Gn +2) of a subsequent scanning line; for the last several rows of scanning lines at the boundary of the touch electrode, the corresponding next scanning line is covered by the next touch electrode and cannot be offset from C outer. The difference in coupling between the boundary and the inside causes a difference in voltage variation of the touch electrodes of the pixel units at the edge of the touch electrode and the inside pixel units, and finally causes a difference in voltage applied to the liquid crystal of the pixel units in the middle row and the boundary row of the touch electrode, so that cross striations are formed at the boundary of the touch electrode.
Disclosure of Invention
The invention provides a common voltage generation circuit, a common voltage generation method and a touch display panel, which are used for solving the problem of horizontal stripes near the junction of a touch electrode and simultaneously inhibiting voltage fluctuation caused by other signal interference and other factors.
The technical scheme provided by the invention is as follows:
the invention discloses a common voltage generating circuit which is used for generating an adjusted common voltage signal and inputting the adjusted common voltage signal into a touch display panel and comprises a plurality of pairs of common voltage signal lines, a preset signal generating module, a common voltage signal adjusting module and a storage module, wherein each pair of common voltage signal lines comprises a signal transmission line and a signal detection line which are connected to the same touch electrode, and the signal transmission line and the signal detection line are connected to the same touch electrode of the touch display panel; the preset signal generating module is electrically connected with the signal transmission line and the signal detection line and outputs a preset common voltage signal to the signal transmission line and the signal detection line; the signal transmission line and the signal detection line receive a preset common voltage signal at a preset stage and output the preset common voltage signal to the touch electrode; the signal transmission line receives a preset common voltage signal and outputs the preset common voltage signal to the touch electrode in a detection stage, and the signal detection line detects an actually measured common voltage signal of the touch electrode in the detection stage and transmits the actually measured common voltage signal to the common voltage signal adjusting module; the public voltage signal adjusting module calculates to obtain an adjusted public voltage signal according to the actually-measured public voltage signal and a preset public voltage signal, and writes the adjusted public voltage signal into the storage module; the storage module is electrically connected with the signal transmission line and the signal detection line and inputs the adjusted common voltage signal into the signal transmission line and the signal detection line in the display stage.
Preferably, the common voltage signal adjusting module comprises a simulation delay submodule, a delay calculation submodule, an amplitude value operator module and a signal generating submodule; the simulation delay submodule receives the actual measurement public voltage signal, simulates a capacitor and a resistor of a touch display panel to delay and calculate the actual measurement public voltage signal and then outputs a simulation public voltage signal; the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal; the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal; and the signal generation submodule calculates the adjusted public voltage signal according to the delay time, the amplitude ratio, the actually-measured public voltage signal and the preset public voltage signal.
Preferably, the analog delay submodule is an N-order RC circuit built according to a capacitance and a resistance of the touch display panel, and N is a positive integer.
Preferably, the adjusted common voltage signal satisfies:
V_4(t)＝AV_3(t+2Δt±δt)+AV_0(t+Δt±0.5δt)；
wherein, V _4(t) is the adjusted common voltage signal, V _3(t) is the actually measured common voltage signal, V _0(t) is the preset common voltage signal, Δ t is the delay time, and δ t is the fine tuning value of Δ t.
Preferably, the common voltage signal adjusting module comprises an analog delay submodule, a delay calculation submodule, an amplitude calculation submodule, an adjustment factor setting submodule and a signal generating submodule; the simulation delay submodule receives the actual measurement public voltage signal, simulates a capacitor and a resistor of a touch display panel to delay and calculate the actual measurement public voltage signal and then outputs a simulation public voltage signal; the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal; the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal; the adjusting factor setting submodule is used for setting an adjusting factor; and the signal generation submodule calculates the adjusted common voltage signal according to the delay time, the amplitude ratio, the actually-measured common voltage signal, the adjustment factor and the preset common voltage signal.
Preferably, the adjusted common voltage signal satisfies:
V_4(t)＝AV_3(t+2Δt±δt)+xAV_0(t)+AV_0(t+Δt±0.5δt)；
wherein, V _4(t) is the adjusted common voltage signal, V _3(t) is the actually measured common voltage signal, Δ t is the delay time, δ t is the fine adjustment value made to Δ t, V _0(t) is the preset common voltage signal, and x is the adjustment factor.
Preferably, the common voltage signal adjusting module comprises a frequency domain converting submodule, a transfer function calculating submodule, a frequency domain signal generating submodule and a time domain converting submodule; the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function; the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on a signal transmission line; the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually-measured frequency domain common voltage function and a transfer function; and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal.
Preferably, the adjusted frequency domain common voltage signal satisfies:
F_4(w)＝""F_0(w)+(F_0(w))/H(jw)-(F_3(w))/〖H(jw)〗^2；
wherein, F _4(w) is the adjusted frequency domain common voltage function, F _0(w) is the preset frequency domain common voltage function, F _3(w) is the actually measured frequency domain common voltage function, h (jw) is the transfer function, and w is the frequency independent variable.
Preferably, the common voltage signal adjusting module comprises a frequency domain converting submodule, a transfer function calculating submodule, a frequency domain adjusting factor setting submodule, a frequency domain signal generating submodule and a time domain converting submodule; the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function; the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on a signal transmission line; the frequency domain adjusting factor setting submodule is used for setting a frequency domain adjusting factor; the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually measured frequency domain common voltage function, a transfer function and an adjustment factor; and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal.
Preferably, the adjusted frequency domain common voltage signal satisfies:
F_4(w)＝F_0(w)(2+jwyτ)-F_3(w)(2+jwyτ)^2；
f _4(w) is an adjusted frequency domain common voltage function, F _0(w) is a preset frequency domain common voltage function, F _3(w) is an actually measured frequency domain common voltage function, y is a frequency domain adjusting factor, w is a frequency independent variable, τ is R × C, R is a panel estimated total resistance, and C is a panel estimated total capacitance.
The invention also discloses a touch display panel, which comprises a common electrode, scanning lines, data lines and pixel units, wherein the scanning lines and the data lines are criss-cross, the pixel units are defined by the scanning lines and the data lines in a crossed mode, the common electrode is divided into a plurality of touch electrodes, each touch electrode corresponds to a plurality of pixel units, and the touch display panel also comprises the common voltage generating circuit.
The invention also discloses a public voltage generation method, which is suitable for the public voltage generation circuit and comprises the following steps:
s1: in a preset stage, a preset signal generation module generates a preset common voltage signal and inputs the preset common voltage signal into a signal transmission line and a signal detection line;
s2: selecting a plurality of touch electrodes on a touch display panel, and switching to a detection stage before pixels corresponding to the touch electrodes are charged; in the detection stage, the signal detection line is switched from a preset state to a detection state, the voltage of the touch electrodes is detected through the signal detection line, the waveform finally detected by the signal detection line is an actually measured common voltage signal, and the actually measured common voltage signal is recorded until a period of time after the pixels corresponding to the touch electrodes are charged;
s3: the public voltage signal adjusting module receives the actually measured public voltage signal and the preset public voltage signal, and calculates according to the actually measured public voltage signal and the preset public voltage signal to obtain an adjusted public voltage signal; and writing the adjusted common voltage signal into the storage module.
Preferably, the step S3 specifically includes the following steps:
s311: a simulation delay submodule of the public voltage signal adjusting module receives the actual measurement public voltage signal, simulates a capacitor and a resistor of the touch display panel to carry out delay calculation on the actual measurement public voltage signal and then outputs a simulation public voltage signal;
s312: the phase shift calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal; the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
s313: the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude ratio, the actually-measured public voltage signal and a preset public voltage signal and writes the adjusted public voltage signal into the storage module; the adjusted common voltage signal satisfies:
V_4(t)＝AV_3(t+2Δt±δt)+AV_0(t+Δt±0.5δt)；
wherein, V _4(t) is the adjusted common voltage signal, V _3(t) is the actually measured common voltage signal, V _0(t) is the preset common voltage signal, Δ t is the delay time, and δ t is the fine tuning value of Δ t.
Preferably, the step S3 specifically includes the following steps:
s131: a simulation delay submodule of the public voltage signal adjusting module receives the actually measured public voltage signal, simulates a capacitor and a resistor of the touch display panel to carry out delay calculation on the actually measured public voltage signal and then outputs a simulated public voltage signal;
s132: the phase shift calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal; the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal; the adjustment factor setting submodule sets an adjustment factor;
s133: the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude proportion, the actually-measured public voltage signal, the adjustment factor and the preset public voltage signal and writes the adjusted public voltage signal into the storage module; the adjusted common voltage signal satisfies:
V_4(t)＝AV_3(t+2Δt±δt)+xAV_0(t)+AV_0(t+Δt±0.5δt)；
wherein, V _4(t) is the adjusted common voltage signal, V _3(t) is the actually measured common voltage signal, Δ t is the delay time, δ t is the fine adjustment value made to Δ t, V _0(t) is the preset common voltage signal, and x is the adjustment factor.
Preferably, the step S3 specifically includes the following steps:
s321: the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
s322: the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the touch display panel, the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually-measured frequency domain common voltage function and the transfer function, and the adjusted frequency domain common voltage function meets the following requirements:
F_4(w)＝""F_0(w)+(F_0(w))/H(jw)-(F_3(w))/〖H(jw)〗^2
wherein, F _4(w) is the adjusted frequency domain common voltage function, F _0(w) is the preset frequency domain common voltage function, F _3(w) is the actually measured frequency domain common voltage function, H (jw) is the transfer function, and w is the frequency independent variable;
s323: and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and writes the adjusted common voltage signal into the storage module.
Preferably, the step S3 specifically includes the following steps:
s321: the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
s322: the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, and the frequency domain adjusting factor setting submodule sets a frequency domain adjusting factor y; the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually measured frequency domain common voltage function, a transfer function and a frequency domain adjustment factor, and the adjusted frequency domain common voltage function meets the following requirements:
F_4(w)＝F_0(w)(2+jwyτ)-F_3(w)(2+jwyτ)^2；
f _4(w) is an adjusted frequency domain common voltage function, F _0(w) is a preset frequency domain common voltage function, F _3(w) is an actually measured frequency domain common voltage function, y is a frequency domain adjusting factor, w is a frequency independent variable, τ is R C, R is a panel estimated total resistance, and C is a panel estimated total capacitance;
s323: and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and writes the adjusted common voltage signal into the storage module.
The invention can bring at least one of the following beneficial effects:
the common voltage generation method comprises the steps of presetting common voltage, detecting and recording real-time change waveforms of actual voltage on the touch electrodes in a preset common voltage environment, and calculating optimized common voltage waveforms by combining the preset waveforms and factors such as delay of a panel signal transmission system, so that the actual voltage waveforms of the touch electrodes subjected to the Gate couples are consistent, the problem of cross striations near the junctions of the touch electrodes is solved, and voltage fluctuation caused by other factors such as signal interference can be inhibited.
Drawings
The present invention will be further described in the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic diagram of an in-cell touch display panel according to the prior art;
fig. 2 is a schematic structural diagram of two adjacent touch electrodes in the touch display panel shown in fig. 1;
fig. 3 is a schematic waveform diagram of a common voltage signal and a scanning signal corresponding to a certain touch electrode in the touch display panel shown in fig. 1;
FIG. 4 is a schematic diagram of a common voltage generating circuit according to the present invention;
FIG. 5 is a schematic diagram of signal conversion of a common voltage generation circuit according to one embodiment of the present invention;
FIG. 6 is a flow chart illustrating a common voltage generation method according to one embodiment of the present invention;
FIG. 7 is a waveform diagram illustrating a plurality of voltage signals in a common voltage generating circuit according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of signal conversion of a common voltage generation circuit according to a second embodiment of the present invention;
fig. 9 is a flowchart illustrating a common voltage generation method according to a second embodiment of the present invention.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
The common voltage generating circuit of the present invention is configured to generate an adjusted common voltage signal and input the adjusted common voltage signal to a touch display panel, where the touch display panel includes a common electrode, criss-cross scan lines and data lines, and pixel units defined by intersections of the scan lines and the data lines, the common electrode is divided into a plurality of touch electrodes 12 (sensors), and each touch electrode 12 corresponds to a plurality of pixel units.
Fig. 4 is a schematic structural diagram of a common voltage generating circuit according to the present invention, where the common voltage generating circuit includes a plurality of pairs of common voltage signal lines, a preset signal generating module 10, a common voltage signal adjusting module 20, and a storage module 30, and each pair of common voltage signal lines includes a signal transmission line 41 and a signal detection line 42 connected to the same touch electrode 12.
The preset signal generating module 10 is electrically connected to the signal transmission line 41 and the signal detection line 42, and outputs a preset common voltage signal to the signal transmission line 41 and the signal detection line 42;
the signal transmission line 41 and the signal detection line 42 output a preset common voltage signal to the touch electrode 12 at a preset stage;
the signal transmission line 41 outputs a predetermined common voltage signal V to the touch electrode 12 during the probing phase0(t), the signal detection line 42 detects the actually measured common voltage signal V of the touch electrode 12 in the detection stage3(t) and measuring the common voltage signal V3(t) to the common voltage signal adjustment module 20;
the common voltage signal adjusting module 20 adjusts the common voltage signal V according to the measured common voltage signal V3(t) and a preset common voltage signal V0(t) calculating to obtain the adjusted common voltage signal V4(t) and adjusting the common voltage signal V4(t) write to the memory module 30;
the memory module 30 is electrically connected to the signal transmission line 41 and the signal detection line 42, and adjusts the adjusted common voltage signal V in the display stage4(t) the signal transmission line 41 and the signal detection line 42 are inputted.
The common voltage generation circuit obtains a pair G by combining RC delay calculation in a preset stage and a detection stageadjusted common voltage signal V after compensation of factors such as ate Couple and the like4(t) adjusting the common voltage signal V4(t) write to the memory module 30. In the subsequent display stage, the signal transmission line 41 and the signal detection line 42 will adjust the common voltage signal V4(t) inputting the touch electrode 12 to make the actual common voltage waveforms of the Gate Couple applied to each region of the touch electrode 12 consistent, thereby improving the problem of horizontal stripes at the boundary of the touch electrode 12 and simultaneously inhibiting voltage fluctuation caused by other signal interference and other factors.
The first embodiment is as follows:
the common voltage signal adjusting module 20 of this embodiment includes a simulation delay submodule, a delay calculating submodule, an amplitude value operator module and a signal generating submodule;
the simulation delay submodule receives the actual measurement public voltage signal, simulates a capacitor and a resistor of a touch display panel to delay and calculate the actual measurement public voltage signal and then outputs a simulation public voltage signal;
the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal;
the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
and the signal generation submodule calculates the adjusted public voltage signal according to the delay time, the amplitude ratio, the actually-measured public voltage signal and the preset public voltage signal.
Fig. 5 is a schematic diagram showing signal conversion of the common voltage generation circuit to which the present embodiment is applied, and fig. 6 is a schematic diagram showing a flow of the common voltage generation method to which the common voltage generation circuit of the present embodiment is applied. Referring to fig. 5 and fig. 6, the present embodiment further discloses a common voltage generation method, including the following steps:
s1: in the preset stage, the preset signal generation module 10 generates a preset common voltage signal V0(t) and input into the signal transmission line 41 and the signal detection line 42, a common voltage signal V is preset0(t) becomes the first Delay common through the RC Delay (Sx Delay for short) on the signal transmission line 41 or the signal detection line 42Voltage signal V1(t) adding the Gate Couple and other signal interference factors (Couple for short)&SI), the actual voltage on the touch electrode 12 is the second delayed common voltage signal V2(t)；
S2: selecting a plurality of touch electrodes 12 on a touch display panel, and switching to a detection stage before charging of pixels corresponding to the touch electrodes 12 is completed; in the detection stage, the signal detection line 42 is switched from the preset state to the detection state, the voltage of the touch electrode 12 is detected through the signal detection line 42, and due to RC delay on the signal detection line 42, the waveform finally detected by the signal detection line 42 is an actually measured common voltage signal V3(t) recording the measured common voltage signal V3(t) a period of time after the charging of the pixels corresponding to the touch electrodes 12 is completed;
s3: the common voltage signal adjustment module 20 receives the measured common voltage signal V3(t) and a preset common voltage signal V0(t) from the measured common voltage signal V3(t) and a preset common voltage signal V0(t) calculating to obtain the adjusted common voltage signal V4(t); and the adjusted common voltage signal V4(t) write to the memory module 30.
Specifically, step S3 includes the steps of:
s311: the analog delay sub-module of the common voltage signal adjustment module 20 receives the measured common voltage signal V3(t) simulating the actually measured common voltage signal V of the capacitance and resistance pairs of the touch display panel3(t) output the analog common voltage signal V after performing delay calculationx(t); the analog delay sub-module may be an N-level RC circuit built according to a capacitance and a resistance of the touch display panel, where N is a positive integer, and preferably N is 10;
s312: the phase shift calculation submodule is used for calculating the phase shift according to the actually measured common voltage signal V3(t) and an analog common voltage signal Vx(t) calculating the delay time delta t; the amplitude calculation submodule is used for calculating the amplitude according to the actually measured common voltage signal V3(t) and an analog common voltage signal Vx(t) setting an amplitude ratio A; the amplitude ratio A is a negative number and can be-1, but is not limited thereto;
s313: the signal generation submodule is used for generating a signal according to the delay time delta t, the amplitude proportion A and the actually measured common voltage signal V3(t) and a preset common voltage signal V0(t) calculating the adjusted common voltage signal V4(t) and adjusting the common voltage signal V4(t) write to memory module 30; regulated common voltage signal V4(t) satisfies:
V4(t)＝AV3(t+2Δt±δt)+AV0(t+Δt±0.5δt)；
wherein, V4(t) is the adjusted common voltage signal, V3(t) measured common voltage signal, V0(t) is a preset common voltage signal, Δ t is a delay time, and δ t is a fine adjustment value of Δ t according to an actual effect. Presetting a common voltage signal V0(t) may be 0, a constant value, or a function of time.
Preferably, the common voltage signal adjusting module 20 further includes an adjustment factor setting submodule, and the adjustment factor setting submodule is used for setting an adjustment factor x; the adjustment factor setting submodule in step S312 sets an adjustment factor x, and the signal generation submodule in step 313 sets an adjustment factor x according to the delay time Δ t, the amplitude ratio a, and the actually measured common voltage signal V3(t), an adjustment factor x and a preset common voltage signal V0(t) calculating the adjusted common voltage signal V4(t) and outputting; regulated common voltage signal V4(t) satisfies:
V4(t)＝AV3(t+2Δt±δt)+xAV0(t)+AV0(t+Δt±0.5δt)；
wherein, V4(t) is the adjusted common voltage signal, V3(t) is the actually measured common voltage signal, Δ t is the delay time, Δ t is the fine adjustment value made to Δ t according to the actual effect, V0And (t) is a preset common voltage signal, and x is an adjusting factor. Presetting a common voltage signal V0(t) may be 0, a constant value, or a function of time.
As shown in FIG. 5, the memory module 30 will adjust the common voltage signal V during the display period4(t) inputting the signal transmission line 41 and the signal detection line 42, and adjusting the common voltage signal V4(t) becomes a third delayed common voltage signal V via RC delay on the signal transmission line 41 or the signal detection line 425(t), after adding Gate Copple and other signal interference factors, the actual voltage on the touch electrode 12 is V0(t)，V0The target common voltage (t) is a target common voltage that matches the common voltage waveforms of the respective areas of the touch electrode 12.
In this embodiment, the common voltage signal V is preset0(t) actually measuring the common voltage signal V3(t) adjusted common voltage signal V4(t) and adjusting the common voltage signal V4(t) the measured voltage signal on the touch electrode 12 after being input to the touch display panel is shown in fig. 7.
Example two
The common voltage signal adjusting module 20 of this embodiment includes a frequency domain converting submodule, a simulation delay submodule, a transfer function calculating submodule, a frequency domain signal generating submodule, and a time domain converting submodule;
the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on the signal transmission line 41;
the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually-measured frequency domain common voltage function and a transfer function;
and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal.
Fig. 8 is a schematic diagram showing signal conversion of the common voltage generation circuit to which the present embodiment is applied, and fig. 9 is a schematic flowchart showing a common voltage generation method to which the common voltage generation circuit of the present embodiment is applied. Referring to fig. 8 and fig. 9, the present embodiment further discloses a common voltage generation method, including the following steps:
s1: in the presetting phase, a presetting signal is generatedThe module 10 generates a preset common voltage signal V0(t) and input into the signal transmission line 41 and the signal detection line 42, a common voltage signal V is preset0(t) becomes the first delayed common voltage signal V via RC delay on the signal transmission line 41 or the signal detection line 421(t), after adding the Gate Couple and other signal interference factors, the actual voltage on the touch electrode 12 is the second delayed common voltage signal V2(t)；
From the aspect of frequency domain, the steps are equivalent to the preset frequency domain common voltage function F0(w) after being processed by the transfer function H (jw), the first delay frequency domain common voltage function F1(w), wherein the transfer function h (jw) is used to model the signal delay on the signal transmission line 41; after adding the Gate Couple and other signal interference factors, the actual voltage on the touch electrode 12 satisfies the second delayed common voltage function as F2(w)；
S2: selecting a plurality of touch electrodes 12 on a touch display panel, and switching to a detection stage before charging of pixels corresponding to the touch electrodes 12 is completed; in the detection stage, the signal detection line 42 is switched from the preset state to the detection state, the voltage of the touch electrode 12 is detected through the signal detection line 42, and due to the RC delay on the signal detection line 42, the waveform finally detected by the signal detection line 42 is an actually measured common voltage signal V3(t); recording measured common voltage signal V3(t) a period of time after the charging of the pixels corresponding to the touch electrodes 12 is completed;
s3: the common voltage signal adjusting module 20 receives the measured common voltage signal V3(t) from the measured common voltage signal V3(t) and a preset common voltage signal V0(t) calculating to obtain the adjusted common voltage signal V4(t); and will adjust the common voltage signal V4(t) write to the memory module 30.
Specifically, step S3 includes the steps of:
s321: the frequency domain conversion submodule is used for presetting a common voltage signal V0(t) conversion to a predetermined frequency domain common voltage function F0(w) measuring the actual common voltage signal V3(t) conversion to measured frequency domain common voltageFunction F3(w)；
S322: the transfer function calculation submodule calculates a transfer function H (jw) according to a design value of the touch display panel or data obtained by detecting the panel, and the frequency domain signal generation submodule calculates a common voltage function F according to a preset frequency domain0(w), actually measured frequency domain common voltage function F3(w) calculating an adjusted frequency domain common voltage function F from the transfer function H (jw)4(w) adjusted frequency domain common voltage function F4(w) satisfies:
wherein, F4(w) is the adjusted frequency domain common voltage function, F0(w) is a predetermined frequency domain common voltage function, F3(w) is an actually measured frequency domain common voltage function, H (jw) is a transfer function, and w is a frequency independent variable;
s323: the time domain conversion submodule adjusts the common voltage function F of the adjusted frequency domain4(w) conversion to an adjusted common voltage signal V4(t) and adjusting the common voltage signal V4(t) write to the memory module 30.
In step S322, the transfer function calculation sub-module establishes a first-order or multi-order RC model according to the design value of the touch display panel or the data obtained by detecting the panel to simulate the delay on the signal transmission line 41.
Preferably, the common voltage signal adjusting module 20 further includes a frequency domain adjustment factor setting sub-module, and the frequency domain adjustment factor setting sub-module is configured to set a frequency domain adjustment factor y; in step S322, the frequency domain adjustment factor setting submodule sets the frequency domain adjustment factor y, and the frequency domain signal generating submodule generates the frequency domain signal according to the preset frequency domain common voltage function F0(w), actually measured frequency domain common voltage function F3(w), transfer function H (jw) and frequency domain regulating factor y to calculate the adjusted frequency domain common voltage function F4(w)。
For example, the transfer function computation sub-module performs an estimation according to a first order RC model:
and then F4(w)＝F0(w)(2+jwyτ)-F3(w)(2+jwyτ)2. Wherein, F4(w) is the adjusted frequency domain common voltage function, F0(w) is a predetermined frequency domain common voltage function, F3And (w) is a measured frequency domain common voltage function, y is a frequency domain regulating factor, w is a frequency independent variable, tau is R and C, R is the estimated total resistance of the panel, and C is the estimated total capacitance of the panel. But are not limited to a first order RC model.
In the display stage, the memory module 30 will adjust the common voltage signal V4(t) inputting the signal transmission line 41 and the signal detection line 42, and adjusting the common voltage signal V4(t) becomes the second delayed common voltage signal V via RC delay on the signal transmission line 41 or the signal detection line 425(t) corresponding to the adjusted frequency domain common voltage function F4(w) processed by transfer function H (jw) and converted into third delay frequency domain common voltage function F5(w), after adding the Gate Couple and other signal interference factors, the actual voltage on the touch electrode 12 is V0(t)，V0The target common voltage (t) is a target common voltage that matches the common voltage waveforms of the respective areas of the touch electrode 12.
The invention also discloses a touch display panel, which comprises a common electrode, scanning lines and data lines which are crisscrossed, and pixel units defined by the scanning lines and the data lines in a crossed manner, wherein the common electrode is divided into a plurality of touch electrodes 12, each touch electrode 12 corresponds to a plurality of pixel units, the touch display panel also comprises any one of the common voltage generating circuits, and the signal transmission lines 41 and the signal detection lines 42 of the same pair of common voltage signal lines in the common voltage generating circuit are connected with the same touch electrodes 12.
It should be noted that the common voltage generating circuit of the present invention may be only used to generate the adjusted common voltage signal before the touch display panel leaves factory and input the adjusted common voltage signal to the touch display panel, and after the input is completed, the preset signal generating module 10 and the common voltage signal adjusting module 20 in the common voltage generating circuit may be separated from the touch display panel main body, and only a plurality of pairs of common voltage signal lines and the storage module 30 are reserved for normal display, but is not limited thereto.
The invention discloses a common voltage generating circuit and a common voltage generating method using the same, wherein the method comprises the steps of presetting a common voltage, detecting and recording a real-time change waveform of an actual voltage on a touch electrode 12 under a preset common voltage environment, and calculating an optimized common voltage waveform by combining the preset waveform and factors such as delay of a panel signal transmission system, so that the actual voltage waveforms of the touch electrode subjected to Gate couples in each row are consistent, the problem of cross striations near the boundary of the touch electrode is improved, and voltage fluctuation caused by other factors such as signal interference can be inhibited.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the foregoing embodiments, and various equivalent changes (such as number, shape, position, etc.) may be made to the technical solution of the present invention within the technical spirit of the present invention, and these equivalent changes are all within the protection scope of the present invention.
Claims (12)
1. A public voltage generating circuit is used for generating an adjusted public voltage signal and inputting the adjusted public voltage signal into a touch display panel and is characterized by comprising a plurality of pairs of public voltage signal lines, a preset signal generating module, a public voltage signal adjusting module and a storage module, wherein each pair of public voltage signal lines comprises a signal transmission line and a signal detection line, and the signal transmission line and the signal detection line are connected to the same touch electrode of the touch display panel;
the preset signal generating module is electrically connected with the signal transmission line and the signal detection line and outputs a preset common voltage signal to the signal transmission line and the signal detection line;
the signal transmission line and the signal detection line receive a preset common voltage signal at a preset stage and output the signal to the touch electrode;
the signal transmission line receives a preset common voltage signal and outputs the preset common voltage signal to the touch electrode in a detection stage, and the signal detection line detects an actually measured common voltage signal of the touch electrode in the detection stage and transmits the actually measured common voltage signal to the common voltage signal adjusting module;
the public voltage signal adjusting module calculates to obtain an adjusted public voltage signal according to the actually-measured public voltage signal and a preset public voltage signal, and writes the adjusted public voltage signal into the storage module;
the storage module is electrically connected with the signal transmission line and the signal detection line and inputs the adjusted common voltage signal into the signal transmission line and the signal detection line in the display stage;
the public voltage signal adjusting module comprises a simulation delay submodule, a delay calculating submodule, an amplitude value operator module and a signal generating submodule;
the simulation delay submodule receives the actual measurement public voltage signal, simulates a capacitor and a resistor of a touch display panel to delay and calculate the actual measurement public voltage signal and then outputs a simulation public voltage signal;
the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal;
the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude ratio, the actually-measured public voltage signal and a preset public voltage signal;
or
The common voltage signal adjusting module comprises a simulation delay submodule, a delay calculation submodule, an amplitude calculation submodule, an adjusting factor setting submodule and a signal generating submodule;
the simulation delay submodule receives the actual measurement public voltage signal, simulates a capacitor and a resistor of a touch display panel to delay and calculate the actual measurement public voltage signal and then outputs a simulation public voltage signal;
the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal;
the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
the adjusting factor setting submodule is used for setting an adjusting factor;
the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude proportion, the actually-measured public voltage signal, the adjustment factor and the preset public voltage signal;
or
The public voltage signal adjusting module comprises a frequency domain conversion submodule, a transfer function calculating submodule, a frequency domain signal generating submodule and a time domain conversion submodule;
the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on a signal transmission line;
the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually-measured frequency domain common voltage function and a transfer function;
the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal;
or
The public voltage signal adjusting module comprises a frequency domain conversion submodule, a transfer function calculating submodule, a frequency domain adjusting factor setting submodule, a frequency domain signal generating submodule and a time domain conversion submodule;
the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on a signal transmission line;
the frequency domain adjusting factor setting submodule is used for setting a frequency domain adjusting factor;
the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually measured frequency domain common voltage function, a transfer function and an adjustment factor;
and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal.
2. The common voltage generation circuit according to claim 1, wherein:
the analog delay submodule is an N-order RC circuit which is built according to the capacitance and the resistance of the touch display panel, and N is a positive integer.
3. The common voltage generation circuit according to claim 1, wherein the common voltage signal adjustment module includes a simulation delay sub-module, a delay calculation sub-module, an amplitude value operator module, and a signal generation sub-module;
the simulation delay submodule receives the actual measurement public voltage signal, simulates a capacitor and a resistor of a touch display panel to delay and calculate the actual measurement public voltage signal and then outputs a simulation public voltage signal;
the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal;
the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude ratio, the actually-measured public voltage signal and a preset public voltage signal;
the adjusted common voltage signal satisfies:
V4(t)＝AV3(t+2Δt±δt)+AV0(t+Δt±0.5δt)；
wherein A is amplitude ratio, V4(t) is the adjusted common voltage signal, V3(t) measured common voltage signal, V0(t) is a predetermined common voltage signal, Δ t is a delay time, and δ t is a fine adjustment value for Δ t.
4. The common voltage generation circuit according to claim 1, wherein the common voltage signal adjustment module comprises an analog delay submodule, a delay calculation submodule, an amplitude calculation submodule, an adjustment factor setting submodule, and a signal generation submodule;
the simulation delay submodule receives the actual measurement public voltage signal, simulates the capacitance and the resistance of the touch display panel to carry out delay calculation on the actual measurement public voltage signal and then outputs a simulation public voltage signal;
the delay calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal;
the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
the adjusting factor setting submodule is used for setting an adjusting factor;
the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude proportion, the actually-measured public voltage signal, the adjustment factor and the preset public voltage signal;
the adjusted common voltage signal satisfies:
V4(t)＝AV3(t+2Δt±δt)+xAV0(t)+AV0(t+Δt±0.5δt)；
wherein A is amplitude ratio, V4(t) is the adjusted common voltage signal, V3(t) is the measured common voltage signal,. DELTA.t is the delay time,. DELTA.t is the fine adjustment made to. DELTA.t, and V0And (t) is a preset common voltage signal, and x is an adjusting factor.
5. The common voltage generation circuit according to claim 1, wherein the common voltage signal adjustment module comprises a frequency domain conversion sub-module, a transfer function calculation sub-module, a frequency domain signal generation sub-module, and a time domain conversion sub-module;
the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on a signal transmission line;
the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually-measured frequency domain common voltage function and a transfer function;
the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal;
the adjusted frequency domain common voltage function satisfies:
wherein, F4(w) is the adjusted frequency domain common voltage function, F0(w) is a predetermined frequency domain common voltage function, F3(w) is the measured frequency domain common voltage function, H (jw) is the transfer function, and w is the frequency independent variable.
6. The common voltage generation circuit according to claim 1, wherein the common voltage signal adjustment module comprises a frequency domain conversion sub-module, a transfer function calculation sub-module, a frequency domain adjustment factor setting sub-module, a frequency domain signal generation sub-module, and a time domain conversion sub-module;
the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, wherein the transfer function is used for simulating signal delay on a signal transmission line;
the frequency domain adjusting factor setting submodule is used for setting a frequency domain adjusting factor;
the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually measured frequency domain common voltage function, a transfer function and an adjustment factor;
the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and outputs the adjusted common voltage signal;
the adjusted frequency domain common voltage function satisfies:
F4(w)＝F0(w)(2+jwyτ)-F3(w)(2+jwyτ)2；
wherein, F4(w) is the adjusted frequency domain common voltage function, F0(w) is a predetermined frequency domain common voltage function, F3And (w) is an actually measured frequency domain common voltage function, y is a frequency domain adjusting factor, w is a frequency independent variable, tau is R and C, R is the estimated total resistance of the panel, and C is the estimated total capacitance of the panel.
7. A touch display panel comprising a common electrode, criss-cross scanning lines and data lines, and pixel units defined by intersections of the scanning lines and the data lines, the common electrode being divided into a plurality of touch electrodes, each touch electrode corresponding to a plurality of pixel units, and further comprising the common voltage generation circuit according to any one of claims 1 to 6.
8. A common voltage generation method applied to the common voltage generation circuit according to claim 1, comprising the steps of:
s1: in a preset stage, a preset signal generation module generates a preset common voltage signal and inputs the preset common voltage signal into a signal transmission line and a signal detection line;
s2: selecting a plurality of touch electrodes on a touch display panel, and switching to a detection stage before pixels corresponding to the touch electrodes are charged; in the detection stage, the signal detection line is switched from a preset state to a detection state, the voltage of the touch electrodes is detected through the signal detection line, the waveform finally detected by the signal detection line is an actually measured common voltage signal, and the actually measured common voltage signal is recorded until a period of time after the pixels corresponding to the touch electrodes are charged;
s3: the public voltage signal adjusting module receives the actually measured public voltage signal and the preset public voltage signal, and calculates according to the actually measured public voltage signal and the preset public voltage signal to obtain an adjusted public voltage signal; and writing the adjusted common voltage signal into the storage module.
9. The method according to claim 8, wherein the step S3 specifically includes the steps of:
s311: a simulation delay submodule of the public voltage signal adjusting module receives the actually measured public voltage signal, simulates a capacitor and a resistor of the touch display panel to carry out delay calculation on the actually measured public voltage signal and then outputs a simulated public voltage signal;
s312: the phase shift calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal; the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal;
s313: the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude ratio, the actually-measured public voltage signal and a preset public voltage signal and writes the adjusted public voltage signal into the storage module; the adjusted common voltage signal satisfies:
V4(t)＝AV3(t+2Δt±δt)+AV0(t+Δt±0.5δt)；
wherein A is amplitude ratio, V4(t) is the adjusted common voltage signal, V3(t) measured common voltage signal, V0(t) is a predetermined common voltage signal, Δ t is a delay time, and Δ t is a fine tuning value for Δ t.
10. The common voltage generation method according to claim 8, wherein the step S3 specifically includes the steps of:
s131: a simulation delay submodule of the public voltage signal adjusting module receives the actual measurement public voltage signal, simulates a capacitor and a resistor of the touch display panel to carry out delay calculation on the actual measurement public voltage signal and then outputs a simulation public voltage signal;
s132: the phase shift calculation submodule calculates delay time according to the actually measured public voltage signal and the simulated public voltage signal; the amplitude calculation submodule sets an amplitude ratio according to the actual measurement public voltage signal and the simulation public voltage signal; the adjustment factor setting submodule sets an adjustment factor;
s133: the signal generation submodule calculates an adjusted public voltage signal according to the delay time, the amplitude proportion, the actually-measured public voltage signal, the adjustment factor and the preset public voltage signal and writes the adjusted public voltage signal into the storage module; the adjusted common voltage signal satisfies:
V4(t)＝AV3(t+2Δt±δt)+xAV0(t)+AV0(t+Δt±0.5δt)；
wherein A is amplitude ratio, V4(t) is the adjusted common voltage signal, V3(t) is the measured common voltage signal,. DELTA.t is the delay time,. DELTA.t is the fine adjustment made to. DELTA.t, and V0And (t) is a preset common voltage signal, and x is an adjusting factor.
11. The common voltage generation method according to claim 8, wherein the step S3 specifically includes the steps of:
s321: the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
s322: the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the touch display panel, the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually-measured frequency domain common voltage function and the transfer function, and the adjusted frequency domain common voltage function meets the following requirements:
wherein, F4(w) is the adjusted frequency domain common voltage function，F0(w) is a predetermined frequency domain common voltage function, F3(w) is the measured frequency domain common voltage function, H (jw) is the transfer function, and w is the frequency independent variable;
s323: and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and writes the adjusted common voltage signal into the storage module.
12. The common voltage generation method according to claim 8, wherein the step S3 specifically includes the steps of:
s321: the frequency domain conversion sub-module converts the preset common voltage signal into a preset frequency domain common voltage function and converts the actual measurement common voltage signal into an actual measurement frequency domain common voltage function;
s322: the transfer function calculation submodule calculates a transfer function according to a design value of the touch display panel or data obtained by detecting the panel, and the frequency domain adjusting factor setting submodule sets a frequency domain adjusting factor y; the frequency domain signal generation submodule calculates an adjusted frequency domain common voltage function according to a preset frequency domain common voltage function, an actually measured frequency domain common voltage function, a transfer function and a frequency domain adjustment factor, and the adjusted frequency domain common voltage function meets the following requirements:
F4(w)＝F0(w)(2+jwyτ)-F3(w)(2+jwyτ)2；
wherein, F4(w) is the adjusted frequency domain common voltage function, F0(w) is a predetermined frequency domain common voltage function, F3(w) is an actually measured frequency domain common voltage function, y is a frequency domain adjusting factor, w is a frequency independent variable, τ is R × C, R is the estimated total resistance of the panel, and C is the estimated total capacitance of the panel;
s323: and the time domain conversion submodule converts the adjusted frequency domain common voltage function into an adjusted common voltage signal and writes the adjusted common voltage signal into the storage module.
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