CN107735657A - Portable electric appts and its pressure-detecting device and method - Google Patents
Portable electric appts and its pressure-detecting device and method Download PDFInfo
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- CN107735657A CN107735657A CN201680000658.XA CN201680000658A CN107735657A CN 107735657 A CN107735657 A CN 107735657A CN 201680000658 A CN201680000658 A CN 201680000658A CN 107735657 A CN107735657 A CN 107735657A
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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
- G06F3/0447—Position sensing using the local deformation of sensor cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- 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
A kind of pressure detection method for portable electric appts, comprise the following steps：Detect deformation signal (S10) caused by pressure corresponding to touch；Deformation signal is converted into electric signal (S20)；Electric signal is captured and quantification treatment is to obtain pressure detecting information (S30)；Calculation of pressure parameter, and the pressure value (S40) according to corresponding to calculation of pressure parameter and pressure detecting information calculate touch are obtained by the way of curve matching.The pressure detection method can realize the accurate detection to touch-control pressure, fully meet the needs of user.A kind of pressure-detecting device for portable electric appts and a kind of portable set are also provided.
Description
The present invention relates to the field of touch technologies, and in particular, to a pressure detection method for a portable electronic device, a pressure detection apparatus for a portable electronic device, and a portable electronic device.
The portable electronic equipment brings great convenience to daily life and work of people and becomes an indispensable tool for people. Input devices for portable electronic devices are various, such as a button, a mouse, a joystick, a laser pointer, a touch screen, etc., wherein the touch screen is rapidly applied to various electronic devices due to its good interactivity.
With the continuous development of the technology, the user has higher and higher requirements on the operation experience of the portable electronic equipment such as a mobile phone, a tablet and the like, and more convenient human-computer interaction experience is expected, so that the pressure detection technology is brought to the birth, and a brand-new operation experience is brought for people to use the portable electronic equipment.
However, the technology of the built-in pressure detection device in the portable electronic device is still in the research and development stage, and some pressure detection schemes in the market need to place a plurality of pressure sensors at the edge of the electronic device such as a mobile phone, a tablet and the like, which not only has high cost, but also increases the thickness of the electronic device.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first objective of the present invention is to provide a pressure detection method for a portable electronic device, which can accurately detect touch strength information.
A second object of the present invention is to provide a pressure detection apparatus for a portable electronic device. A third object of the present invention is to provide a portable electronic device.
In order to achieve the above object, a pressure detection method for a portable electronic device according to an embodiment of a first aspect of the present invention includes the following steps: detecting a deformation signal generated by pressure corresponding to the touch action; converting the deformation signal into an electric signal; capturing and quantizing the electric signal to acquire pressure detection information; and acquiring a pressure calculation parameter by adopting a curve fitting mode, and calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information.
According to an embodiment of the invention, the deformation signal is converted into an electrical signal through an inductive electrode, wherein the inductive electrode is arranged in a capacitive array, a touch area of the portable electronic device is divided into a plurality of areas according to the position of the inductive electrode, each area is defined as a logic channel, and each logic channel corresponds to a group of pressure calculation parameters. The division of the plurality of regions may be uniform or non-uniform.
According to an embodiment of the present invention, the pressure detecting method further includes: acquiring coordinate information of a touch position corresponding to the touch action; and acquiring a corresponding logic channel according to the coordinate information, and acquiring a pressure calculation parameter corresponding to the logic channel.
According to an embodiment of the present invention, N corresponding logic channels are further obtained according to the coordinate information, a pressure calculation parameter corresponding to each logic channel in the N logic channels is obtained, N pressure values corresponding to the N logic channels are respectively calculated according to N groups of pressure calculation parameters, and a pressure value corresponding to the touch action is calculated by using a spatial interpolation method according to the N pressure values and center position coordinates of the N logic channels, where N is an integer greater than 1.
Specifically, the pressure value corresponding to the touch action may be calculated according to the following formula:
the Rawdata is the pressure detection information, the F is a pressure value corresponding to the touch action, and the a, the b, the c and the d are pressure calculation parameters.
According to an embodiment of the present invention, calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information includes: establishing a pressure detection information-pressure value table at preset force intervals according to the pressure calculation parameters and the pressure detection information; and calculating a pressure value corresponding to the touch action in a piecewise approximate linear mode according to the pressure detection information and the pressure detection information-pressure value table.
According to one embodiment of the invention, the pressure calculation parameters are obtained by adopting a curve fitting mode, and the method comprises the following steps: respectively adopting m different pressure values FiPressing is carried out, and corresponding pressure detection information r is respectively recordediWherein i is 1, 2, …, m; according to the acquired m groups of data (F)i,ri) And fitting the pressure calculation parameters a, b, c and d by adopting a least square method.
In summary, according to the pressure detection method for the portable electronic device in the embodiments of the present invention, based on the obtained pressure detection information, the pressure calculation parameter can be obtained by adopting a curve fitting manner, and the coordinate information of the touch position is combined, and the accurate detection of the touch pressure is realized by adopting the virtual logic channel and the spatial interpolation algorithm, so that the same pressure value can be accurately detected at different touch positions with the same touch force, the consistency of pressure output at different touch positions is improved, and the needs of the user are fully satisfied.
In order to achieve the above object, a pressure detection apparatus for a portable electronic device according to an embodiment of a second aspect of the present invention includes: the sensing electrode is used for detecting a deformation signal generated by pressure corresponding to the touch action and converting the deformation signal into an electric signal; the detection circuit is used for capturing and quantizing the electric signal to acquire pressure detection information; and the computing system acquires pressure computing parameters in a curve fitting mode and computes pressure values corresponding to the touch actions according to the pressure computing parameters and the pressure detection information.
According to one embodiment of the invention, the sensing electrodes are arranged in a capacitive array, and the sensing electrodes divide a touch area of the portable electronic device into a plurality of logic channels, and each logic channel corresponds to a set of pressure calculation parameters.
According to an embodiment of the present invention, the computing system is further configured to obtain coordinate information of a touch position corresponding to the touch action, obtain a corresponding logical channel according to the coordinate information, and obtain a pressure calculation parameter corresponding to the logical channel.
According to an embodiment of the present invention, the computing system is further configured to obtain N corresponding logic channels according to the coordinate information, obtain a pressure calculation parameter corresponding to each logic channel of the N logic channels, calculate N pressure values corresponding to the N logic channels according to N sets of pressure calculation parameters, and calculate a pressure value corresponding to the touch action by using a spatial interpolation method according to the N pressure values and center position coordinates of the N logic channels, where N is an integer greater than 1.
Specifically, according to an embodiment of the present invention, the calculation system may calculate the pressure value corresponding to the touch action according to the following formula:
the Rawdata is the pressure detection information, the F is a pressure value corresponding to the touch action, and the a, the b, the c and the d are pressure calculation parameters.
According to an embodiment of the present invention, a pressure detection information-pressure value table is further preset in the computing system, and the computing system is further configured to calculate a pressure value corresponding to the touch action by using a piecewise approximate linear manner according to the pressure detection information and the pressure detection information-pressure value table.
According to an embodiment of the present invention, the calculation system is further configured to obtain the pressure calculation parameter according to m different pressure values F by using a curve fitting methodiPressure detection information r corresponding to pressingiObtaining m sets of data (F)i,ri) And according to said m sets of data (F)i,ri) And fitting the pressure calculation parameters a, b, c and d by adopting a least square method, wherein i is 1, 2, … and m.
According to the pressure detection device for the portable electronic equipment, disclosed by the embodiment of the invention, based on the pressure detection information acquired by the detection circuit, the calculation system can acquire the pressure calculation parameter in a curve fitting mode, and in combination with the coordinate information of the touch position, the accurate detection of the touch pressure is realized by adopting the virtual logic channel and the spatial interpolation algorithm, so that the same pressure value can be accurately detected when the same touch force is adopted by different touch positions, the consistency of pressure output of different touch positions is improved, and the requirements of users are fully met.
In addition, the embodiment of the invention also provides a portable electronic device which comprises the pressure detection device.
The portable electronic equipment provided by the embodiment of the invention can realize accurate detection of the touch pressure, can accurately detect the same pressure value when different touch positions adopt the same touch force, improves the consistency of pressure output of different touch positions, fully meets the requirements of users and improves the user experience.
Fig. 1 is a block schematic diagram of a pressure detection apparatus for a portable electronic device according to an embodiment of the present invention;
FIG. 2a is a schematic layout of a sensing electrode according to an embodiment of the present invention;
FIG. 2b is a schematic layout of a sensing electrode according to another embodiment of the present invention;
FIG. 2c is a schematic layout of a sensing electrode according to another embodiment of the present invention;
FIG. 3a is a schematic diagram of a structural arrangement of a sensing electrode according to an embodiment of the present invention;
FIG. 3b is a schematic diagram of a structural arrangement of a sensing electrode according to another embodiment of the present invention;
FIG. 3c is a schematic diagram of a structural arrangement of a sensing electrode according to yet another embodiment of the present invention;
FIG. 4a is a block diagram of a detection circuit according to one embodiment of the present invention;
FIG. 4b is a block schematic diagram of a detection circuit according to another embodiment of the present invention;
FIG. 4c is a block schematic diagram of a detection circuit according to yet another embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating capacitance variation when a corresponding region of a sensing electrode is pressed according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a Rawdata-F curve after curve parameter fitting according to an embodiment of the present invention;
FIG. 7a is a schematic view of the amount of deformation during center position pressing according to one embodiment of the present invention;
FIG. 7b is a schematic view of the amount of deformation near the press at the right edge according to one embodiment of the present invention;
FIG. 7c is a schematic view of the amount of deformation when pressed near the left edge according to one embodiment of the present invention;
FIG. 8 is a diagram illustrating a touch screen divided into 32 logic channels by 9 sensing electrodes according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a Rawdata-F curve corresponding to the type variables of different position pressing according to an embodiment of the present invention;
FIG. 10a is a schematic diagram of a touch screen divided into 32 logic channels by 3 sensing electrodes according to another embodiment of the present invention;
FIG. 10b is a schematic diagram of a Rawdata data curve corresponding to a plurality of points pressed by a logic channel along a horizontal direction with the same force according to an embodiment of the present invention;
fig. 11 is a flowchart of a pressure detection method for a portable electronic device according to an embodiment of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
First, it should be noted that the pressure detection technology is different from the touch detection technology, and not only the presence or absence of pressure but also the magnitude of the pressure need to be detected during pressure detection, that is, accurate pressure measurement is realized. Moreover, in order to ensure the consistency of the user operation experience, the calculated force is required to be the same when the same force is pressed at different positions. However, in practical applications, the deformation amount generated when the same force acts on different positions may be different, which results in different detected deformation amounts and thus different final detected forces.
Therefore, a method for changing the size of the sensing electrode is proposed in the related art, that is, the sensing electrodes placed at different positions have different sizes, so as to solve the above problem. However, due to the non-linearity of the capacitance versus distance relationship, changing the size of the sensing electrode does not completely solve the above problem, and this approach also limits the flexibility of the sensing electrode layout.
Based on the knowledge and research of the above problems, the pressure detection method for the portable electronic device, the pressure detection apparatus for the portable electronic device, and the portable electronic device according to the present invention can achieve accurate detection of pressure without specially designing the size of the sensing electrode, and keep the pressure outputs at different touch positions consistent.
A pressure detection method for a portable electronic device, a pressure detection apparatus for a portable electronic device, and a portable electronic device according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the pressure detection apparatus for a portable electronic device according to the embodiment of the present invention includes a sensing electrode 10, a detection circuit 20, and a computing system 30.
When pressure acts on an input medium (for example, a touch screen of a portable electronic device), the input medium generates a deformation signal, and the sensing electrode 10 is configured to detect the deformation signal generated by the pressure corresponding to a touch action and convert the deformation signal into an electrical signal. The detection circuit 20 is used for capturing and quantizing the electrical signal to obtain pressure detection information. The calculation system 30 obtains the pressure calculation parameter by curve fitting, and calculates a pressure value corresponding to the touch control action according to the pressure calculation parameter and the pressure detection information. That is, the sensing electrode 10 converts the deformation signal into a certain form of electrical signal, the detection circuit 20 captures and quantizes the electrical signal, and then sends the quantized signal to the computing system 30 for processing, so as to extract the required pressure information and accurately compute the pressure.
According to an embodiment of the present invention, the sensing electrode 10 may be disposed in a capacitive array, and particularly, refer to fig. 2a to 2 c. The sensing electrode 10 adopts a capacitive array, so that the existing touch chip in the portable electronic device can be used for pressure detection, or the sensing electrode is integrated into a touch system, so that an additional control chip is not required, and the cost can be greatly reduced.
In addition, the capacitive array can be used for embedding the induction electrode into the liquid crystal display module, so that the structure does not bring more thickness increase.
Fig. 3a, 3b, and 3c show three different embodiments of the sensing electrode. Specifically, as shown in fig. 3a, the sensing electrode 10 is attached below an LCD (Liquid Crystal Display), and a certain gap exists between the sensing electrode 10 and a middle frame supporting the LCD module, and the gap may be filled with foam having good compressibility, where the middle frame supporting the LCD module may be a middle frame of a mobile phone or a middle frame of other kinds of electronic devices. After the system is electrified to work, the Vcom ITO layer and the middle frame of the LCD module are connected to the system ground, and the capacitance C exists between the sensing electrode 10 and the Vcom ITO layer of the LCD module1The induction electrode 10 and the middle frame have a capacitor C2，C1And C2Are connected in parallel. When the Cover plate is pressed, the Cover plate deforms, the distance between the induction electrode 10 and the middle frame is reduced, and the capacitor C2Increase, at this time C1Is substantially negligible, and thus can be detected by detecting C2The current pressing force can be determined according to the change of the pressure.
The structure shown in fig. 3b is similar to that shown in fig. 3a, in which the sensing electrode 10 can be attached to the middle frame of the mobile phone supporting the LCD module, and a certain gap exists between the sensing electrode 10 and the LCD module. When the system is powered on, the ITO layer (Vcom) and the middle frame of the LCD module are connected to the system ground, and the sensing electrode 10 and the ITO layer (Vcom) of the LCD module existCapacitor C1The induction electrode 10 and the middle frame have a capacitor C2，C1And C2Are connected in parallel. When the Cover plate is pressed, the Cover plate deforms and the distance between the ITO layer (Vcom) of the LCD module and the sensing electrode 10 is reduced, and the capacitor C1Increase, at this time C2Is substantially negligible, and is thus detected by C1The current pressing force can be determined according to the change of the pressure.
The structure shown in fig. 3c is applied to the embodiment where the LCD module has a metal back frame, and the structure is similar to the structure shown in fig. 3b, except that the sensing electrode 10 is attached to the metal back frame of the LCD module, which is not described in detail here.
It should be noted that the illustration shown in fig. 3a to 3c only shows the structural positions of the sensing electrodes, and the number and specific layout of the sensing electrodes are not limited. In the embodiment of the present invention, the number and the specific layout of the sensing electrodes can be as shown in fig. 2a to 2b, but it is understood that the present invention is not limited thereto.
In the embodiment of the present invention, the detection circuit 20 may also have various implementations, as shown in fig. 4a to 4 b. Fig. 4a and 4b are self-capacitance detection circuits, and fig. 4c is a mutual capacitance detection circuit. Of course, the practical application is not limited to these three detection circuits.
Specifically, as shown in fig. 4a, the detection circuit adopts an RC voltage division structure, where Tx is a driving signal, and may be a signal in various forms such as a sine wave, a square wave, and the like. The driving signal Tx is coupled to the capacitor Ctp to be detected through the resistor R0, the signal on the capacitor Ctp to be detected is amplified through the amplifying circuit, the signal amplified by the amplifying circuit is sent to the filtering circuit for filtering, and the output signal of the filtering circuit is sent to the demodulating circuit for demodulation, so as to obtain the original data (Rawdata) in a specific form, namely, certain specific characteristic of the original signal, namely, the pressure detection information. The Rawdata is sent to the computing system 30, and the computing system 30 can calculate the current pressure information according to the change of the current pressure detection information Rawdata.
The detection circuit shown in FIG. 4b is a capacitance detection circuit using charge transferIn the above description, Tx is a driving signal, and may be a sine wave, a square wave, or other various signals. Control switch phi1Close and control switch phi2When the detection circuit is disconnected, the capacitor Ctp to be detected is charged, and meanwhile, the capacitor Ca is discharged; at the control switch phi1Opening and simultaneously closing the control switch phi2When the voltage is measured, the capacitor Ca is subjected to voltage division charging by using a capacitor Ctp to be detected, and Cb is subjected to integral charging; the output signal of the integrating circuit is sent to a filter circuit for filtering processing, and the output signal of the filter circuit is sent to a demodulation circuit for demodulation to obtain original data (Rawdata) in a specific form, namely certain specific characteristic of the original signal, namely pressure detection information; the Rawdata is sent to the computing system 30, and the computing system 30 can calculate the current pressure information according to the change of the current pressure detection information Rawdata.
In the detection circuit shown in fig. 4c, Tx is a driving signal, and may be a signal in various forms such as a sine wave, a square wave, and the like. The driving signal Tx is coupled to an integral amplifying circuit at the rear end through a capacitor Ctp to be detected, the output signal of the integral amplifying circuit is sent to a filter circuit for filtering processing, the output signal of the filter circuit is sent to a demodulation circuit for demodulation, and original data Rawdata in a specific form, namely certain specific characteristics of the original signal, namely pressure detection information, is obtained; the Rawdata is fed into the computing system 30 so that the computing system 30 can calculate the current pressure magnitude information according to the change of the current pressure detection information Rawdata.
Further, the pressure calculation process of the pressure detection device according to the embodiment of the present invention is described by taking the sensing electrode shown in fig. 3a and the detection circuit shown in fig. 4a as examples.
Wherein, the capacitor C to be detectedtp＝C1+C2During the pressing process, C1Remains substantially unchanged, C2Increases with the increase of the pressure and is in the local area C of the press2Can be equivalent to a parallel plate capacitor, as shown in FIG. 5, before pressing, C2＝C20After the pressing, the pressing is carried out,
when the driving signal Tx is the gain G of the amplifying circuit, the demodulating circuit adopts an amplitude demodulation mode, and the output Rawdata is expressed by the following formula:
where Δ d is a deformation amount generated by a certain pressure F, and F and Δ d approximately satisfy hooke's law, that is, F ═ k Δ d, elastic stiffness coefficients k corresponding to different touch positions are different, so that formula (1) can be expressed as:
wherein, a is AG, b is wR0C1，c＝wR0C20kd0，d＝kd0Equation (2) can be simplified as:
therefore, in an embodiment of the present invention, the computing system 30 can calculate the pressure value corresponding to the touch action according to the above formula (3), where Rawdata is the pressure detection information, F is the pressure value corresponding to the touch action, and a, b, c, and d are the pressure calculation parameters.
However, it is difficult to accurately obtain the gain G and the capacitance C of the amplifier circuit in advance1、C20Initial distance d0And the value of the elastic stiffness coefficient k. Therefore, in the embodiment of the present invention, the calculation system 30 may obtain the pressure calculation parameters a, b, c, and d by curve fitting, so as to perform the pressure calculation using the above formula (3), and achieve a higher calculation accuracy.
In an embodiment of the present invention, when the calculation system 30 obtains the pressure calculation parameters by curve fitting, it is further configured to obtain the pressure calculation parameters according to m different pressure values FiPressure detection information r corresponding to pressingiObtaining m sets of data (F)i,ri) And according to said m sets of data (F)i,ri) And fitting pressure calculation parameters a, b, c and d by adopting a least square method, wherein i is 1, 2, … and m.
That is, when the calculation system 30 obtains the pressure calculation parameters a, b, c, and d in advance by curve fitting, m different forces F are used in advanceiPressing is carried out, and the corresponding pressure detection information r is respectively recordediWhere i is 1, 2, …, m, and then m sets of data (F) are acquiredi,ri) Finally, fitting pressure calculation parameters a, b, c and d by adopting a least square method,and saving the pressure calculation parameters a, b, c and d, so that the calculation system 30 substitutes the Rawdata obtained in real time into the above formula (3) to calculate F.
In a specific example of the present invention, sample data of 0g, 100g, 200g, 300g, 400g, 500g, and 600g may be collected in advance, and the sample data may be used to fit the pressure calculation parameters a, b, c, and d and draw a Rawdata-F curve, as shown in fig. 6. As can be seen from fig. 6, the sample data can basically well fall on the fitting curve, so that accurate pressure magnitude information can be calculated by substituting the pressure detection information Rawdata output by the detection circuit and corresponding to any pressure degree F into the formula (3).
In the above description, F is a time for acquiring sample dataiThe method is not limited to 0g, 100g, 200g, 300g, 400g, 500g and 600g, and any force within the range of the measuring range can be used, and the number m of sample data is larger than 4.
Since the above formula (3) relates to square and square operations, and the operation amount is relatively large for a general MCU, in an embodiment of the present invention, the calculation system 30 may further preset a table of pressure detection information-pressure value table, i.e., F-Rawdata, so that the calculation system 30 is further configured to calculate the pressure value corresponding to the touch action by using a piecewise approximate linear manner according to the pressure detection information Rawdata and the pressure detection information-pressure value table.
Specifically, a table about F-Rawdata may be built according to the above equation (3) at a certain strength interval step (e.g. 50g), for example, as shown in table 1 below, and the table is stored in the system flash/memory in advance. If the computing system 30 obtains that the Rawdata when a certain force is pressed is y in real time, and y isi>y≥yi+1The pressure value can be calculated in a piecewise approximately linear manner, i.e.
TABLE 1
However, in practical applications, the deformation amount generated when the same force acts on different positions may be different, which results in different detected deformation amounts, and thus different final detected forces, as shown in fig. 7a to 7 c.
Fig. 7a to 7c are schematic diagrams of deformation amounts of the same force pressing at different positions in the X direction, in which the sensing electrodes are placed at the bottom for convenience of description. The X direction is referred to herein as the horizontal direction (lateral direction) and the vertical direction is the Y direction (longitudinal direction) of the touch screen. Fig. 7a is a schematic diagram of the amount of deformation when pressing at the center, fig. 7b is a schematic diagram of the amount of deformation when pressing near the right edge, and fig. 7c is a schematic diagram of the amount of deformation when pressing near the left edge. As shown in fig. 7a to 7c, the amount of deformation pressed near the left and right edges is smaller than that pressed at the center position, i.e., Δ d in fig. 7a is different from Δ d in fig. 7b or 7 c. If the pressure information is measured only according to the deformation amount, the pressure calculated by the system at different positions will have larger deviation when the same force is pressed at different positions.
Similarly, the amount of deformation will be different when pressed with the same force at different positions along the Y direction.
Therefore, the pressure detection device of the embodiment of the invention can calculate the pressure value corresponding to the touch action by adopting a virtual logic channel and a spatial interpolation mode in combination with the coordinate information of the touch position, thereby improving the consistency of pressure output at different positions.
According to one embodiment of the invention, the touch area of the portable electronic device is divided into a plurality of areas by combining the positions of the sensing electrodes, each area is defined as a logic channel, and each logic channel corresponds to a group of pressure calculation parameters. The division of the plurality of regions may be uniform division or non-uniform division.
Specifically, as shown in fig. 8, the pressure detection device includes 9 independent sensing electrodes S0-S8, and can divide the touch screen into 32 areas according to positions, and each area corresponds to one logic channel, that is, there are 32 logic channels C0-C31. It should be noted that the 32 logical channels C0 to C31 are virtual, and actually, there is no need for physical sensing electrodes. For example, logic channel C14 selects data for sense electrode S4, and logic channel C12 selects data for sense electrode S3. Referring to fig. 9, the two Rawdata-F curves corresponding to the logic channels C12 and C14 have a significant difference, which reflects the difference in deformation amount generated by the two presses. Therefore, in order to obtain consistent pressure output at different positions, it is necessary to obtain pressure calculation parameters corresponding to each logic channel in advance, and during actual operation, the corresponding logic channel is selected according to the position coordinate information to perform real-time pressure calculation.
In an embodiment of the present invention, the computing system 30 is further configured to obtain coordinate information of a touch position corresponding to the touch action, obtain a corresponding logical channel according to the coordinate information, and obtain a pressure calculation parameter corresponding to the logical channel, so as to facilitate accuracy of subsequent pressure calculation.
Specifically, the logical channel C is first determinediAnd a sensing electrode SiOf logical channels C, i.e. logical channels CiThe data of which sensing electrode is used for pressure calculation, and then each logic channel C is obtained according to the curve fitting modeiPressure calculation parameter a ofi，bi，ci，diThere are 32 sets, which are stored in the flash memory. Then sample data is acquired (F)i,ri) When the center position of the logical channel is pressed, as in the position of the circle in fig. 8. And finally, calculating the area of the logic channel where the current pressing center position falls by using the position coordinate information reported by the system, and reading out the pressure calculation parameters of the logic channel from the flash memory. Meanwhile, according to the mapping relation table of the logic channel and the sensing electrode, the data of the sensing electrode corresponding to the logic channel is selected and the data and the pressure calculation parameter are substituted into the formula (3) for pressure calculation, and then the accurate pressure calculation value can be obtained.
When the mapping relation table of the logic channel and the sensing electrode is established, the mapping method can be various. For example, one approach may be to choose based on location, with each logic channel choosing the sensing electrode closest to it. Another method may be to select based on the magnitude of the amount of deformation, each logic channel selecting the sensing electrode whose amount of deformation is the greatest when pressed at its location; in addition, one logic channel can be considered to select data of a plurality of sensing electrodes. And are not limited thereto.
Of course, in the above embodiment, the touch screen is divided into 32 logic channels, and in practical applications, any number of logic channels may be divided according to needs, and the dividing manner is not limited.
In an embodiment of the present invention, in order to further improve the pressure calculation accuracy of the position outside the center position of the logic channel, the calculation system 30 is further configured to obtain N corresponding logic channels according to the coordinate information, obtain a pressure calculation parameter corresponding to each of the N logic channels, and calculate N pressure values corresponding to the N logic channels according to N sets of pressure calculation parameters, respectively, so as to calculate the pressure value corresponding to the touch action by adopting a spatial interpolation manner according to the N pressure values and the center position coordinates of the N logic channels, where N is an integer greater than 1.
Specifically, taking three sensing electrodes as an example, as shown in fig. 10a, a pressure detection apparatus for a portable electronic device in one embodiment includes 3 sensing electrodes S0-S2 and 32 logic channels C0-C31 corresponding to the 3 sensing electrodes S0-S2, and presses at 13 different points with the same force along a horizontal line where the logic channel C12 is located, and Rawdata data output by the sensing electrode S1 is shown in fig. 10 b.
If the actual pressing center position is P0 in FIG. 10a, then it can be seen from FIG. 10b that the Rawdata output by S1 when pressed at P0 is smaller than the Rawdata output by S1 when pressed at logic channel C12 and larger than the Rawdata output by S1 when pressed at logic channel C13. If the pressure calculation parameters corresponding to the logic channels C12 or C13 are directly used for calculation, the calculated pressure value is larger or smaller.
Similarly, the same phenomenon exists in the vertical direction, and if the calculated pressure value is directly calculated by using the pressure calculation parameter corresponding to the logic channel C5 or C9 at P1 in fig. 10a, the calculated pressure value will be larger or smaller.
Therefore, in order to reduce the deviation of the calculated pressure of a single logic channel, in one embodiment of the present invention, the pressure calculation may be performed by using multiple logic channels at the same time, which is described as P2 in fig. 10 a.
Firstly, selecting pressure calculation parameters corresponding to four logic channels C4, C5, C8 and C9 which are nearest to P2 for pressure calculation, and respectively marking the calculated pressure values as F1，F2，F3，F4Assuming that the coordinates at P2 are (x, y), the coordinates of the center positions of the logical channels C4, C5, C8 and C9 are (x, y), respectively1,y1)，(x2,y2)，(x3,y3)，(x4,y4) And calculating the pressure at the position P2 by a bilinear interpolation method, wherein the specific method is as follows:
interpolation in the X direction:
Fx1＝αxF1+(1-αx)F2,Fx2＝αxF3+(1-αx)F4,
interpolation in the Y direction:
Fy＝αyFx1+(1-αy)Fx2,
the method of spatial interpolation is not limited to the above method, and may be selected reasonably according to specific situations. For example, a plurality of logical channels near P2 may be selected to calculate the pressure at P2 by a surface fitting method, and as shown in fig. 10a, 9 logical channels of C0, C1, C2, C4, C5, C6, C8, C9 and C10 may be selected to calculate the pressure at P2 by a quadratic surface fitting estimation method.
Therefore, the pressure value corresponding to the touch action is calculated by selecting the pressure calculation parameters corresponding to the plurality of logic channels and adopting a spatial interpolation mode, and the accuracy of pressure calculation can be further improved.
According to the pressure detection device for the portable electronic equipment, disclosed by the embodiment of the invention, based on the pressure detection information acquired by the detection circuit, the calculation system can acquire the pressure calculation parameter in a curve fitting mode, and in combination with the coordinate information of the touch position, the accurate detection of the touch pressure is realized by adopting the virtual logic channel and the spatial interpolation algorithm, so that the same pressure value can be accurately detected when the same touch force is adopted by different touch positions, the consistency of pressure output of different touch positions is improved, and the requirements of users are fully met.
Fig. 11 is a flowchart of a pressure detection method for a portable electronic device according to an embodiment of the present invention. As shown in fig. 11, the pressure detection method for a portable electronic device includes the steps of:
s10, detecting a deformation signal generated by a pressure corresponding to the touch control action.
When a pressure corresponding to the touch action acts on an input medium (e.g., a touch screen of the portable electronic device), the input medium generates a deformation signal.
And S20, converting the deformation signal into an electric signal.
Wherein, in one embodiment of the present invention, the deformation signal is converted into an electrical signal through the sensing electrode. Also, the structure of the sensing electrode may be as shown in fig. 3a to 3 b.
And S30, capturing and quantizing the electric signal to acquire pressure detection information.
And S40, acquiring pressure calculation parameters by adopting a curve fitting mode, and calculating a pressure value corresponding to the touch action according to the pressure calculation parameters and the pressure detection information.
That is to say, the sensing electrode converts the deformation signal into an electric signal in a certain form, the electric signal is captured and quantized through the detection circuit, and then the quantized signal is sent to the computing system to be processed, so that required pressure information is extracted, and the pressure is accurately calculated.
In an embodiment of the present invention, the sensing electrodes may be disposed in a capacitive array, which can be referred to in fig. 2a to 2 c. The sensing electrodes adopt the capacitive array, so that the existing touch control chip in the portable electronic equipment can be utilized for pressure detection, or the sensing electrodes are integrated into a touch control system, so that an additional control chip is not required, and the cost can be greatly reduced.
In addition, the capacitive array can be used for embedding the induction electrode into the liquid crystal display module, so that the structure does not bring more thickness increase.
However, in practical applications, the deformation amount generated when the same force acts on different positions may be different, which results in different detected deformation amounts, and thus different final detected forces, as shown in fig. 7a to 7 c.
Therefore, the pressure detection method of the embodiment of the invention can calculate the pressure value corresponding to the touch action by adopting a virtual logic channel and a spatial interpolation mode in combination with the coordinate information of the touch position, thereby improving the consistency of pressure output at different positions.
According to one embodiment of the invention, the touch area of the portable electronic device is divided into a plurality of areas by combining the positions of the sensing electrodes, each area is defined as a logic channel, and each logic channel corresponds to a group of pressure calculation parameters. The division of the plurality of regions may be uniform division or non-uniform division. Specifically, as shown in fig. 8, the 9 independent sensing electrodes S0 to S8 can divide the touch screen into 32 areas according to position, and each area corresponds to one logic channel, that is, there are 32 logic channels C0 to C31.
And, as shown in fig. 8 and 9, the logic channel C14 selects data of the sensing electrode S4, and the logic channel C12 selects data of the sensing electrode S3, so that there is a significant difference between two Rawdata-F curves corresponding to the logic channels C12 and C14, which reflects the difference in deformation amount generated when the two pressing points are pressed. Therefore, in order to obtain consistent pressure output at different positions, it is necessary to obtain pressure calculation parameters corresponding to each logic channel in advance, and during actual operation, the corresponding logic channel is selected according to the position coordinate information to perform real-time pressure calculation.
Therefore, according to an embodiment of the present invention, the pressure detecting method further includes: acquiring coordinate information of a touch position corresponding to the touch action; and acquiring a corresponding logic channel according to the coordinate information, and acquiring a pressure calculation parameter corresponding to the logic channel. And then, calculating the pressure of the touch position according to the acquired pressure calculation parameter corresponding to the logic channel.
Further, to reduce the bias of a single logic channel to calculate pressure, in one embodiment of the present invention, multiple logic channels may be utilized simultaneously to perform pressure calculations. That is to say, in the pressure detection method according to the embodiment of the present invention, N corresponding logic channels are further obtained according to the coordinate information, a pressure calculation parameter corresponding to each logic channel in the N logic channels is obtained, N pressure values corresponding to the N logic channels are respectively calculated according to N groups of pressure calculation parameters, and a pressure value corresponding to the touch action is calculated by adopting a spatial interpolation method according to the N pressure values and center position coordinates of the N logic channels, where N is an integer greater than 1.
Specifically, the example is shown at P2 in fig. 10 a. Firstly, selecting pressure calculation parameters corresponding to four logic channels C4, C5, C8 and C9 which are nearest to P2 for pressure calculation, and respectively marking the calculated pressure values as F1，F2，F3，F4Assuming that the coordinates at P2 are (x, y), the coordinates of the center positions of the logical channels C4, C5, C8 and C9 are (x, y), respectively1,y1)，(x2,y2)，(x3,y3)，(x4,y4) And calculating the pressure at the position P2 by a bilinear interpolation method, wherein the specific method is as follows:
interpolation in the X direction:
Fx1＝αxF1+(1-αx)F2,Fx2＝αxF3+(1-αx)F4,
interpolation in the Y direction:
Fy＝αyFx1+(1-αy)Fx2,
therefore, the pressure calculation parameters corresponding to the plurality of logic channels are selected, and the pressure value corresponding to the touch action is calculated in a spatial interpolation mode, so that the accuracy of pressure calculation can be further improved.
In an embodiment of the present invention, the pressure value corresponding to the touch action may be calculated according to the following formula:
the Rawdata is the pressure detection information, the F is a pressure value corresponding to the touch action, and the a, the b, the c and the d are pressure calculation parameters.
Furthermore, according to another embodiment of the present invention, in step S40, the calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information includes: establishing a pressure detection information-pressure value table at preset force intervals according to the pressure calculation parameters and the pressure detection information, for example, as shown in table 1 above; and calculating a pressure value corresponding to the touch action in a piecewise approximate linear mode according to the pressure detection information and the pressure detection information-pressure value table.
Wherein, adopt the mode of curve fitting to obtain pressure calculation parameter, include: respectively adopting m different pressure values FiPressing is carried out, and corresponding pressure detection information r is respectively recordediWherein i is 1, 2, …, m; according to the acquired m groups of data (F)i,ri) And fitting the pressure calculation parameters a, b, c and d by adopting a least square method.
In summary, according to the pressure detection method for the portable electronic device in the embodiments of the present invention, based on the obtained pressure detection information, the pressure calculation parameter can be obtained by adopting a curve fitting manner, and the coordinate information of the touch position is combined, and the accurate detection of the touch pressure is realized by adopting the virtual logic channel and the spatial interpolation algorithm, so that the same pressure value can be accurately detected at different touch positions with the same touch force, the consistency of pressure output at different touch positions is improved, and the needs of the user are fully satisfied.
In addition, the embodiment of the invention also provides a portable electronic device which comprises the pressure detection device. The portable electronic device may be a mobile terminal such as a mobile phone, a tablet, etc., among others.
The portable electronic equipment provided by the embodiment of the invention can realize accurate detection of the touch pressure, can accurately detect the same pressure value when different touch positions adopt the same touch force, improves the consistency of pressure output of different touch positions, fully meets the requirements of users and improves the user experience.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (15)
- A pressure detection method for a portable electronic device, comprising:detecting a deformation signal generated by pressure corresponding to the touch action;converting the deformation signal into an electric signal;capturing and quantizing the electric signal to acquire pressure detection information;and acquiring a pressure calculation parameter by adopting a curve fitting mode, and calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information.
- The pressure detection method according to claim 1, wherein the deformation signal is converted into an electrical signal by an inductive electrode, wherein the inductive electrode is disposed in a capacitive array, and a touch area of the portable electronic device is divided into a plurality of areas according to a position of the inductive electrode, each area is defined as a logical channel, and each logical channel corresponds to a set of pressure calculation parameters.
- The pressure detection method according to claim 2, further comprising:acquiring coordinate information of a touch position corresponding to the touch action;and acquiring a corresponding logic channel according to the coordinate information, and acquiring a pressure calculation parameter corresponding to the logic channel.
- The pressure detection method according to claim 3, further obtaining N corresponding logical channels according to the coordinate information, obtaining a pressure calculation parameter corresponding to each of the N logical channels, and calculating N pressure values corresponding to the N logical channels according to N sets of pressure calculation parameters, respectively, so as to calculate a pressure value corresponding to the touch action by using a spatial interpolation method according to the N pressure values and center position coordinates of the N logical channels, where N is an integer greater than 1.
- The pressure detection method according to any one of claims 1-4, wherein the pressure value corresponding to the touch action is calculated according to the following formula:the Rawdata is the pressure detection information, the F is a pressure value corresponding to the touch action, and the a, the b, the c and the d are pressure calculation parameters.
- The pressure detection method according to any one of claims 1 to 4, wherein calculating a pressure value corresponding to the touch action according to the pressure calculation parameter and the pressure detection information includes:establishing a pressure detection information-pressure value table at preset force intervals according to the pressure calculation parameters and the pressure detection information;and calculating a pressure value corresponding to the touch action in a piecewise approximate linear mode according to the pressure detection information and the pressure detection information-pressure value table.
- The pressure detection method according to claim 1, wherein the obtaining of the pressure calculation parameter by means of curve fitting comprises:respectively adopting m different pressure values FiPressing is carried out, and corresponding pressure detection information r is respectively recordediWherein i is 1, 2, …, m;according to the acquired m groups of data (F)i,ri) And fitting the pressure calculation parameters a, b, c and d by adopting a least square method.
- A pressure detection apparatus for a portable electronic device, comprising:the sensing electrode is used for detecting a deformation signal generated by pressure corresponding to the touch action and converting the deformation signal into an electric signal;the detection circuit is used for capturing and quantizing the electric signal to acquire pressure detection information;and the computing system acquires pressure computing parameters in a curve fitting mode and computes pressure values corresponding to the touch actions according to the pressure computing parameters and the pressure detection information.
- The pressure detection device of claim 8, wherein the sensing electrodes are disposed in a capacitive array, and a touch area of the portable electronic device is divided into a plurality of areas according to positions of the sensing electrodes, each area is defined as a logic channel, and each logic channel corresponds to a set of pressure calculation parameters.
- The pressure detection apparatus according to claim 9, wherein the computing system is further configured to obtain coordinate information of a touch position corresponding to the touch action, obtain a corresponding one of the logic channels according to the coordinate information, and obtain a pressure calculation parameter corresponding to the logic channel.
- The pressure detection apparatus according to claim 10, wherein the computing system is further configured to obtain, according to the coordinate information, N corresponding logic channels, obtain a pressure calculation parameter corresponding to each logic channel of the N logic channels, and calculate, according to N sets of pressure calculation parameters, N pressure values corresponding to the N logic channels, respectively, so as to calculate, according to the N pressure values and center position coordinates of the N logic channels, a pressure value corresponding to the touch action by using a spatial interpolation method, where N is an integer greater than 1.
- The pressure detection device according to any one of claims 8-11, wherein the computing system calculates the pressure value corresponding to the touch action according to the following formula:the Rawdata is the pressure detection information, the F is a pressure value corresponding to the touch action, and the a, the b, the c and the d are pressure calculation parameters.
- The pressure detection apparatus according to any one of claims 8 to 11, wherein a pressure detection information-pressure value table is further preset in the computing system, and the computing system is further configured to calculate a pressure value corresponding to the touch action by using a piecewise-approximately-linear manner according to the pressure detection information and the pressure detection information-pressure value table.
- The pressure detection device of claim 8The method is characterized in that when the calculation system obtains the pressure calculation parameters in a curve fitting mode, the calculation system is also used for obtaining the pressure calculation parameters according to m different pressure values FiPressure detection information r corresponding to pressingiObtaining m sets of data (F)i,ri) And according to said m sets of data (F)i,ri) And fitting the pressure calculation parameters a, b, c and d by adopting a least square method, wherein i is 1, 2, … and m.
- A portable electronic device, characterized in that it comprises a pressure detection apparatus according to any one of claims 8-14.
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