CN108762538A - capacitive pressure detection device - Google Patents
capacitive pressure detection device Download PDFInfo
- Publication number
- CN108762538A CN108762538A CN201810147592.8A CN201810147592A CN108762538A CN 108762538 A CN108762538 A CN 108762538A CN 201810147592 A CN201810147592 A CN 201810147592A CN 108762538 A CN108762538 A CN 108762538A
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- Prior art keywords
- base material
- module
- display screen
- gap
- detection device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- 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
-
- 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 capacitive pressure detection device for detect application pressing force on a display screen, including is each provided with the first base material and the second base material and data processing module of electrode.The first base material and the second base material front relatively fit together, and make to form gap between respectively set electrode, the gap and the air communication outside the first base material and the second base material.At least one in the first base material and the second base material to be used as pressure loading end, pressure loading end can be attached to below the display module of display screen.The present invention is not necessarily to form pressure sensing capacitance by the component in display screen, can be suitable for current most of display screens；The present invention provides physical support to form the gap of pressure sensing capacitance, it is ensured that gap thickness is controllable；The present invention ensures the rate of change of capacitance of pressure sensing capacitance by substrate material and foam medium, improves the sensitivity of pressure detecting.
Description
Technical field
The present invention relates to the device that power is acquired to and is converted to electric signal, more particularly to using capacitance as conversion medium,
It will reflect that the Electric signal processing of pressure is the pressure-detecting device of pressure data.
Background technology
The prior art based on capacitance principle, can detect that apply the display screen of pressing force thereon include for completing image
The display module of display, pressure detecting electrode, and the backlight module with iron frame.A kind of implementation is pressure detecting electrode
It is bonded with display module, the air gap is formed between pressure detecting electrode and backlight module, be ginseng with the iron frame of backlight module
Plane is examined, pressure sensing capacitance is formed between pressure detecting electrode and backlight module.When there is pressing force to apply on a display screen,
Pressure detecting electrode is deformed upon with the deformation of compression display module, because the iron frame of pressure detecting electrode and backlight module it
Between spacing change and pressure sensing capacitance between the two made to change, by data processing by pressure sensing capacitance
Variable quantity be converted to the pressure value of pressing force.Another implementation is that pressure detecting electrode is bonded with backlight module, is being pressed
The air gap is formed between power detecting electrode and display module, using display module as reference planes, pressure detecting electrode and display
Pressure sensing capacitance is formed between module.When there is pressing force to apply on a display screen, display module as a reference plane
It deforms upon, makes pressure sensing capacitance between the two because the spacing between pressure detecting electrode and display module changes
It changes, the variable quantity of pressure sensing capacitance is converted to the pressure value of pressing force by data processing.The prior art exists
Defect and shortcoming below：
1. energy when needing the air gap there are adequate thickness between display module and backlight module to ensure to occur push action
It is enough to generate the pressure sensing capacitance variable quantity for being different from interference signal enough, but air can not resist interstructural variation and make
The thickness of the air gap is not easy to control；
2. not all display screen is both provided with the backlight module with iron frame；
When display module uses thin film transistor liquid crystal display Thin Film Transistor Liquid Crystal
When the display module of Display, the backlight module of nonmetallic frame is used in some applications, this is caused to use the backlight of nonmetallic frame
Module can not form pressure sensing capacitance between pressure detecting electrode as a reference plane, also just cannot achieve pressure detecting；
Thin film transistor liquid crystal display Thin Film Transistor Liquid Crystal Display abbreviations TFT-LCD；
When display module uses active-matrix Organic Light Emitting Diode Active Matrix Organic Light Emitting
When the display module of Diode, it is not necessary that backlight module is arranged, pressure detecting electrode is flat because of the reference for not forming pressure sensing capacitance
Face and cannot achieve pressure detecting；Active-matrix Organic Light Emitting Diode Active Matrix Organic Light
Emitting Diode abbreviations AMOLED.
Invention content
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art place and propose can be used in current big
The capacitive pressure detection device of most display screens.
The present invention, which solves the technical problem, to be realized by using following technical scheme：
It designs, manufacture a kind of capacitive pressure detection device, for detecting the pressing force applied on a display screen.The display screen packet
Include can due to applying pressing on a display screen the display module of deformation.Capacitive pressure detection device includes can be by swaging
The first base material of change and the second base material, at least first electrode being arranged on the first base material front, setting the second base material just
An at least second electrode on face, and it is electrically connected the data processing module of first electrode and second electrode.The first base material
It relatively fits together with the second base material front, shape between face where face where making all first electrodes and all second electrodes
At gap, and the gap and the air communication outside the first base material and the second base material.Face and all second where all first electrodes
The distance between face is the thickness in gap where electrode, and the first base material and the second base material are not pressurized described in the thickness of deformation time gap
Normality thickness.At least one in the first base material and the second base material to be used as pressure loading end, pressure loading end can be attached to display
Below the display module of screen, enable the deformation with the deformation of display screen of pressure loading end；It is applied to display screen when there is pressing
When upper, pressure loading end deforms upon, and the thickness in the gap changes；When there is no pressing to apply on a display screen, institute
It states gap and keeps normality thickness.
When capacitive pressure detection device is based on mutual capacitance principle, the data processing module includes for sending out driving letter
Number drive module, and the sensing module for passive electrode response signal.In all first electrodes and all second electrodes
One group of electrical connection drive module, another group of electrical connection sensing module.
When capacitive pressure detection device is based on self-capacitance principle, the data processing module includes that can send out excitation letter
Number and detect self-capacitance variation self-capacitance data processing module.One group in all first electrodes and all second electrodes is electrically connected
It is connected to capacitance data processing module, another group of electrical connection reference potential.
Specifically, the front edge of the first base material is bonded envelope with the front edge of the second base material using annular colloid
It closes, the air-flow through-hole of an at least communication gap is machined at least one of the first base material and the second base material, make gap and the
Air communication outside one base material and the second base material.
To improve the deformation quantity of pressure loading end, the first base material is attached to the display of display screen as pressure loading end
Below module, the Young's modulus of the first base material is less than the Young's modulus of the second base material.
Similarly, second base material is attached to as pressure loading end below the display module of display screen, the second base material
Young's modulus is less than the Young's modulus of the first base material.
To improve rate of change of capacitance, foam made of material of the useful dielectric constant higher than air is filled in the gap
Medium.
Specifically, the dielectric constant is high density polyurethane material higher than the material of air.
The display module of a kind of application scheme, the display screen is the display module of thin film transistor liquid crystal display, this is aobvious
Display screen further includes one layer of backlight module being arranged below thin film transistor liquid crystal display module.The first base material or the second base material
It is attached to below backlight module as pressure loading end.
The display module of another application scheme, the display screen is active-matrix organic light-emitting diode display module.
The first base material or the second base material are attached to the cathode of active-matrix organic light-emitting diode display module as pressure loading end
Face.
Compared with the existing technology compared with " capacitive pressure detection device " of the invention has technical effect that：
1. the present invention without forming pressure sensing capacitance as a reference plane by the component in display screen, by pressure loading end
It is fitted on the deformable element of display screen and pressure detecting can be realized, current most of display screens can be suitable for；
2. the present invention provides physical support to form the gap of pressure sensing capacitance, it is ensured that gap thickness is controllable；
3. the present invention ensures the rate of change of capacitance of pressure sensing capacitance by substrate material and foam medium, pressure detecting is improved
Sensitivity.
Description of the drawings
Fig. 1 is the orthographic projection schematic front view of " capacitive pressure detection device " first embodiment of the invention；
Fig. 2 is the orthographic projection schematic top plan view of the first embodiment；Wherein the first base material 11 is cut away by demifacet；
Fig. 3 is A-A schematic cross-sectional views shown in Fig. 2；
Fig. 4 is the schematic cross-sectional view along A-A directions shown in Fig. 2 when the first embodiment is depressed；
Fig. 5 be the first embodiment be used for TFT-LCD display screens when along A-A directions shown in Fig. 2 schematic cross-sectional view；
Fig. 6 be the first embodiment be used for AMOLED display screens when along A-A directions shown in Fig. 2 schematic cross-sectional view；
Fig. 7 is the orthographic projection schematic top plan view of second embodiment of the invention；Wherein the first base material 11 is cut away by demifacet.
Specific implementation mode
It is described in further detail below in conjunction with each embodiment shown in attached drawing.
The present invention proposes a kind of capacitive pressure detection device, for detecting the pressing force applied on a display screen.Apply
Pressing force on a display screen is different from the input of the touching to screen, and pressing force is to apply pressure to display screen, and touch input
Pressure need not be applied, it is only necessary to have contact to display screen.The display screen includes can be because applying on a display screen
It presses and the display module of deformation.As shown in Figures 1 to 7, capacitive pressure detection device includes that can be pressurized the first of deformation
Base material 11 and the second base material 12, at least first electrode 21 being arranged on the front of the first base material 11 are arranged in the second base material
An at least second electrode 22 on 12 front, and it is electrically connected the data processing module of first electrode and second electrode.First
The flexible printed circuit board Flexible Printed Circuit of abbreviation FPC may be used in base material 11 and the second base material 12,
Film F ilm may be used.First electrode 21 and second electrode 22 may be used silver coating material and be made, and metal can also be used to spread
Copper product is made, and can also be made of the tin indium oxide Indium Tin Oxide materials of abbreviation ITO.The first base material 11
It relatively fits together with 12 front of the second base material, makes 21 place face of all first electrodes and 22 place face of all second electrodes
Between form gap 5, and the air communication outside the gap 5 and the first base material 11 and the second base material 12, that is, gap 5 is non-envelope
The space closed.At least one in the first base material 11 and the second base material 12 to be used as pressure loading end, pressure loading end can be attached to
Below the display module of display screen, enable pressure loading end deformation with the deformation of display screen.In most cases,
One in one base material 11 and the second base material 12 is used as pressure loading end, but under special circumstances, such as by capacitive pressure
When detection device is used for double-sided screen, the first base material 11 and the second base material 12 are used as pressure loading end.First embodiment of the invention
It is all made of the first base material 11 with second embodiment and is used as pressure loading end.The present invention is by 21 place face of all first electrodes and owns
Thickness of the distance between the 22 place face of second electrode as gap 5, then the first base material and the second base material are not pressurized when deformation
The thickness in gap 5 is exactly normality thickness.The face where 21 place face of first electrode and second electrode is all plane and parallel to each other
When, normality thickness is to determine value；And the face where 21 place face of first electrode and second electrode is when being not plane or the first electricity
When face where 21 place face of pole and second electrode is not parallel to each other, normality thickness is exactly according to the different and different change of two sides relative position
That is, according to the form in first electrode 21 and second electrode 22 face where respective consecutive variations occur for amount.Therefore normality thickness cannot
The letter for being understood merely as being a fixed amount, but joining with the morphologic correlation in first electrode 21 and second electrode 22 face where respective
Number variable.When there is pressing to apply on a display screen, pressure loading end deforms upon, and the thickness in the gap 5 is with respect to normality thickness
Degree changes, and pressure sensing capacitance can also change；When not having pressing to apply on a display screen, the gap 5 is kept
Normality thickness.Data processing module applies voltage to first electrode 21 and second electrode 22 and forms voltage difference therebetween
When, pressure sensing capacitance is just formed between first electrode 21 and second electrode 22.
When capacitive pressure detection device is based on self-capacitance principle, data processing module includes that can send out excitation letter
Number and detect self-capacitance variation self-capacitance data processing module.One group in all first electrodes 21 and all second electrodes 22
It is electrically connected self-capacitance data processing module, another group of electrical connection reference potential.First embodiment of the invention is former based on self-capacitance
The capacitive pressure detection device of reason, as shown in Figures 1 to 6, three first electrodes 21 of setting and a second electrode 22, first
Electrode 21 distinguishes face second electrode 22, and all first electrodes 21 are electrically connected self-capacitance data processing module, all second electrodes
22 electrical connection reference potentials, form pressure detecting self-capacitance between first electrode 21 and second electrode 22.
When capacitive pressure detection device is based on mutual capacitance principle, data processing module includes for driving electrodes
It sends out the drive module of drive signal, and generates the sensing mould of response signal for collecting sensing electrode because of drive signal
Block.One group of electrical connection drive module in all first electrodes 21 and all second electrodes 22 and be used as driving electrodes, another group
It is electrically connected sensing module and is used as sensing electrode.Second embodiment of the invention is the capacitive pressure detection based on mutual capacitance principle
Device, as shown in fig. 7, three first electrodes 21 of setting and four second electrodes 22, first electrode 21 is mutual with second electrode 22
It orthogonally lays, all first electrodes 21 are electrically connected drive module, and all second electrodes 22 are electrically connected sensing module, in the first electricity
Pressure detecting mutual capacitance is formed between pole 21 and second electrode 22.
The data processing module for being used alone as pressure detection data processing may be used in data processing module.Data processing mould
Block can also use the data processing module of display screen, both complete the data processing of display screen, also complete capacitive pressure detection
The data processing of device.Namely data processing module is not limited to physically the standalone module on either hardware, Ke Yishi
The function module for completing pressure detection data processing in independent hardware can also be more than two hardware module collaborations
Complete the function module of pressure detection data processing.It should be according to concrete application environment using suitable physical device or hardware
Configuration.
First embodiment of the invention and second embodiment, as shown in Figure 1, Figure 2 and Figure 7, the front of the first base material 11
Edge is bonded closing with the front edge of the second base material 12 using annular colloid 3.In the first base material 11 and the second base material 12
At least one air-flow through-hole 4 for being machined with an at least communication gap 5 makes outside gap 5 and the first base material 11 and the second base material 12
Air communication.First embodiment of the invention and second embodiment are machined with air-flow on the second base material 12 as shown in Figure 2 and Figure 7
Through-hole 4 is communication gap 5, some air-flow through-holes 4 run through the second base material 12, some air-flow through-holes 4 are through the second base material 12 and the
Two electrodes 22.
First embodiment of the invention, as shown in figure 4, when there is pressing to apply on a display screen, the first base material 11 is as pressure
Power loading end deforms upon, while the second base material 12 can also deform upon, since pressing force directly acts in the first base material 11,
The deformation quantity of second base material 12 is less than the deformation quantity of the first base material 11, and the thickness in the gap 5 changes with respect to normality thickness,
Arrow direction as shown in Figure 4, the air in gap 5 are squeezed and are discharged from each air-flow through-hole 4.The thickness in gap 5 changes
Mean that the distance between first electrode 21 and second electrode 22 change, the pressure sensing capacitance formed between them also can
It changes, the variation of pressure sensing capacitance can be converted to the pressure value of pressing force by data processing.When not pressing
When pressure is applied on a display screen, the first base material 11 and the second base material 12 return to normal, and capacitive pressure detection device is from shown in Fig. 4
State is restored to state shown in Fig. 3, the caliper recovery normality thickness in the gap 5, outside the first base material 11 and the second base material 12
Air sucks in gap 5.
First embodiment of the invention, when the first base material 11 is attached to as pressure loading end the display module of display screen
When lower section, the Young's modulus of the first base material 11 is less than the Young's modulus of the second base material 12, makes the first base as pressure loading end
Material 11 is easier to deform upon compared with the second base material 12, to increase the thickness change amplitude in gap 5, increases pressure sensing capacitance
Rate of change of capacitance, improve pressure detecting sensitivity.
Similarly, when second base material 12 is attached to as pressure loading end below the display module of display screen, second
The Young's modulus of base material 12 is less than the Young's modulus of the first base material 11, can also increase the rate of change of capacitance of pressure sensing capacitance,
Improve pressure detecting sensitivity.
In said program and first embodiment and second embodiment, useful dielectric constant is filled in the gap 5
Foam medium made of material higher than air improves so as to further increase the rate of change of capacitance of pressure sensing capacitance
Pressure detecting sensitivity.In addition, filling foam medium in gap 5 also contributes to the first base material 11 and the second base material 12
Flatness further improves pressure detecting sensitivity.
The dielectric constant can be high density polyurethane material higher than the material of air.
As shown in figure 5, when the capacitive pressure detection device of first embodiment of the invention is loaded in TFT-LCD display screens
When, i.e. the display module of display screen is the display module 61 of thin film transistor liquid crystal display TFT-LCD, which further includes setting
Set one layer of backlight module 62 below the display module 61 of TFT-LCD.11 conduct of the first base material of first embodiment of the invention
Pressure loading end is attached to 62 lower section of backlight module.Obviously when the second base material 12 is as pressure loading end, the second base material 12 is answered
When being attached to the lower section of backlight module 62.Using capacitive pressure detection device of the present invention, no matter backlight module 62 is provided with metal
Whether frame, capacitive pressure detection device can be worked normally without being influenced by backlight module 62, not need backlight module 62
The reference planes for forming pressure sensing capacitance are provided.
As shown in fig. 6, when the capacitive pressure detection device of first embodiment of the invention is loaded in AMOLED display screens,
The display module of the display screen is the display module 71 of active-matrix Organic Light Emitting Diode AMOLED.The present invention first is implemented
The first base material 11 of example is attached to the cathode plane of the display module 71 of AMOLED as pressure loading end.Obviously when the second base material 12
When as pressure loading end, the second base material 12 should be attached to the cathode plane of the display module 71 of AMOLED.Using electricity of the invention
Appearance formula pressure-detecting device does not need AMOLED display screens and provides the reference planes to form pressure sensing capacitance, capacitive pressure
Detection device itself can form pressure sensing capacitance.
Claims (10)
1. a kind of capacitive pressure detection device, for detecting the pressing force applied on a display screen；The display screen includes can
The display module of deformation due to applying pressing on a display screen；It is characterized in that：
The first base material including the deformation that can be pressurized and the second base material, at least one first electricity being arranged on the first base material front
At pole, at least second electrode being arranged on the second base material front, and the data of electrical connection first electrode and second electrode
Manage module；
The first base material and the second base material front relatively fit together, face and all second where making all first electrodes
Gap, and the gap and the air communication outside the first base material and the second base material are formed between face where electrode；All first electrodes
The distance between face where place face and all second electrodes is the thickness in gap, and the first base material and the second base material are not pressurized deformation
When gap thickness be normality thickness；
At least one in the first base material and the second base material to be used as pressure loading end, pressure loading end is attached to the display mould of display screen
Group lower section, enables the deformation with the deformation of display screen of pressure loading end, and when there is pressing to apply on a display screen, pressure is held
Section deforms upon, and the thickness in the gap changes；When not having pressing to apply on a display screen, the gap keeps normal
State thickness.
2. capacitive pressure detection device according to claim 1, it is characterised in that：
The data processing module includes the drive module for sending out drive signal, and for passive electrode response signal
Sensing module；
One group of electrical connection drive module in all first electrodes and all second electrodes, another group of electrical connection sensing module.
3. capacitive pressure detection device according to claim 1, it is characterised in that：
The data processing module includes the self-capacitance data processing module that can be sent out pumping signal and detect self-capacitance variation；
One group of electrical connection self-capacitance data processing module in all first electrodes and all second electrodes, another group of electrical connection ginseng
Examine current potential.
4. capacitive pressure detection device according to claim 1, it is characterised in that：
The front edge of the first base material is bonded closing with the front edge of the second base material using annular colloid, in the first base material
It is machined with the air-flow through-hole of an at least communication gap at least one of the second base material, makes gap and the first base material and the second base
Air communication outside material.
5. capacitive pressure detection device according to claim 1, it is characterised in that：
The first base material is attached to as pressure loading end below the display module of display screen, and the Young's modulus of the first base material is small
In the Young's modulus of the second base material.
6. capacitive pressure detection device according to claim 1, it is characterised in that：
Second base material is attached to as pressure loading end below the display module of display screen, and the Young's modulus of the second base material is small
In the Young's modulus of the first base material.
7. according to the capacitive pressure detection device described in claim 1,5 or 6, it is characterised in that：
Foam medium made of material of the useful dielectric constant higher than air is filled in the gap.
8. capacitive pressure detection device according to claim 7, it is characterised in that：
The dielectric constant is high density polyurethane material higher than the material of air.
9. capacitive pressure detection device according to claim 1, it is characterised in that：
The display module of the display screen is thin film transistor liquid crystal display module, which further includes being arranged in film crystal
One layer of backlight module below pipe liquid crystal display die set；
The first base material or the second base material are attached to as pressure loading end below backlight module.
10. capacitive pressure detection device according to claim 1, it is characterised in that：
The display module of the display screen is active-matrix organic light-emitting diode display module；
The first base material or the second base material are attached to active-matrix organic light-emitting diode display module as pressure loading end
Cathode plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810147592.8A CN108762538A (en) | 2018-02-12 | 2018-02-12 | capacitive pressure detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810147592.8A CN108762538A (en) | 2018-02-12 | 2018-02-12 | capacitive pressure detection device |
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| Publication Number | Publication Date |
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| CN108762538A true CN108762538A (en) | 2018-11-06 |
Family
ID=63980080
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810147592.8A Pending CN108762538A (en) | 2018-02-12 | 2018-02-12 | capacitive pressure detection device |
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| CN106855758A (en) * | 2015-12-09 | 2017-06-16 | 南昌欧菲光科技有限公司 | Touch display unit |
| US20180031885A1 (en) * | 2016-08-01 | 2018-02-01 | Japan Display Inc. | Force sensing device and display device comprising the same |
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| CN105278792A (en) * | 2015-04-13 | 2016-01-27 | 希迪普公司 | Pressure detecting module and touch input device including the same |
| CN106569628A (en) * | 2015-10-11 | 2017-04-19 | 压力剖面系统公司 | Force-sensing touch screen input device |
| CN106708305A (en) * | 2015-11-13 | 2017-05-24 | 南昌欧菲光科技有限公司 | Touch display apparatus |
| CN106855758A (en) * | 2015-12-09 | 2017-06-16 | 南昌欧菲光科技有限公司 | Touch display unit |
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| US20180031885A1 (en) * | 2016-08-01 | 2018-02-01 | Japan Display Inc. | Force sensing device and display device comprising the same |
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Application publication date: 20181106 |