CN106055157B - A kind of sensitivity consistency calibration method of pressure touch equipment - Google Patents
A kind of sensitivity consistency calibration method of pressure touch equipment Download PDFInfo
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- CN106055157B CN106055157B CN201610395199.1A CN201610395199A CN106055157B CN 106055157 B CN106055157 B CN 106055157B CN 201610395199 A CN201610395199 A CN 201610395199A CN 106055157 B CN106055157 B CN 106055157B
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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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
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention discloses a kind of sensitivity consistency calibration methods of pressure touch equipment, and this method comprises the following steps: 101, in advance by all coordinate points Sensitivity Calibrations of X/Y plane, and being stored；102, all the sensors corresponding pressure value is measured；103, pressure is judged whether there is to press；104, sensitivity calibration is handled, and obtains final pressure value.The present invention passes through the calibration and pressure calibration to each sensor coordinates, it can guarantee touch screen/Trackpad marginal position, same pressure is pressed in place or sensor position directly above between sensor, the problem of obtaining same pressure value, well solved sensitivity consistency.
Description
Technical field
The invention belongs to the technical fields of pressure touch, the in particular to sensitivity correction method of pressure touch equipment.
Background technique
With the high speed development of intelligent electronic device, pressure touch technology appears in mobile phone, smartwatch and notes application,
And have the tendency that widely available.Due to the constraint of pressure sensor volume and cost, keep pressure sensor very intensive
Ground is arranged in touch screen or Trackpad, this can make same pressure by the position of different touch screens or Trackpad, and pressure detecting goes out
Different pressure values reflects the problem of touch screen or touch-control sensitivity consistency difference.
Patent application 201310358756.9 discloses a kind of three based on diaphragm pressure sensor and three axis accelerometer
Tie up multi-point touch screen, comprising: capacitance touch screen body, several diaphragm pressures sensing that the capacitance touch screen body back side is set
Device, capacitance touch screen control chip, pressure sensor interface circuit, main control chip；The capacitance touch screen body connects capacitive touch
Screen control chip is touched, the diaphragm pressure sensor connects pressure sensor interface circuit；Capacitance touch screen controls chip and pressure
Force snesor interface circuit is connect with main control chip respectively；One 3-axis acceleration sensor of the main control chip connection, described three
Axle acceleration sensor is for obtaining the acceleration value perpendicular to capacitance touch screen body surface face and being transferred to main control chip；The present invention
It can be realized when equipment is under different lateral attitudes and motion state to the accurate of the touch-control pressure perpendicular to touch screen surface
Perception, to accurately obtain the corresponding practical touch-control pressure in multiple touch points.However, this method is by measuring pressure sensor
Pressure value, the deviation of each pressure sensor is 0.25*M*Za.Main control chip calculates the pressure measuring value after being corrected,
And for multiple pressure sensors, using the method for minimum secondary variance matrix inversion, for four diaphragm pressure sensors
Available any touch-control pressure value for being less than or equal to 4 touch points, although this method is capable of providing pair to a certain extent
In the accuracy of touch-control pressure, but not can solve due to touch screen bring sensitivity variations itself, and this method is main
Touch screen pressure perception applied to inclination and when motion state, can't resolve that touch screen different location sensitivity is inconsistent to ask
Topic.
Summary of the invention
To solve the above problems, the purpose of the present invention is to provide a kind of calibrations of the sensitivity consistency of pressure touch equipment
Method, this method solve low quantity pressure sensor matrix arrange the touch control device whole district between sensitivity consistency the problem of.
To achieve the above object, technical scheme is as follows.
A kind of sensitivity consistency calibration method of pressure touch equipment, it is characterised in that this method comprises the following steps:
101, it in advance by all coordinate points Sensitivity Calibrations of X/Y plane, and is stored；
Touching is applied to all coordinate points determined by the touch screen or Trackpad on touch control device using calibration facility one by one
Control screen or Trackpad can identify the corresponding pressure of minimum scale division (LSB), and pressure-detecting device detects each sensor pressure values
The sum of, and record；1,2,3 is numbered to all the sensors by certain rule ..., M+N, their corresponding pressure values
For P1, P2, P3 ..., PM+N.
Coordinate is that the pressure value (also referred to as calibration factor) of (x, y) corresponding minimum scale is PXYlsb=PXY1+PXY2+
PXY3+…+PXYM+N。
The number, pressure value and calibration factor are stored, and write power down nonvolatile memory by controller, with
It is convenient for sensitivity calibration.
102, all the sensors corresponding pressure value is measured；
When touch control device works normally, sensor is measured, the pressure value of each sensor is obtained.
103, pressure is judged whether there is to press.
The pressure value of all the sensors is added up, saves the minimum in calibration factor if it is larger than or equal to memory
Value, then it represents that there is pressure to press, then carry out pressure-sensitivity calibration adjustment；If it is less than the minimum resolution of pressure value, then
Continue to measure pressure sensor.
104, sensitivity calibration is handled, and obtains final pressure value.
When having detected that pressure is pressed, all the sensors are numbered 1,2,3 ..., M+N, their corresponding pressure
Value be P1, P2, P3 ..., PM+N.
Obtain all the sensors pressure value and be PXYtotal=P1+P2+P3+ ...+PM+N.
The coordinate (x, y) being pressed is determined later, determines (x, y) coordinate method are as follows:
The corresponding relative pressure of each sensor is Pi1=P1/PXYtotal；Pi2=P2/PXYtotal；…；Pi(M
+ N)=PM+N/PXYtotal.
The corresponding relative pressure of all the sensors is { Pi1, Pi2, Pi3 ..., Pi (M+N) }, corresponding sensor number
It is 1,2,3 ..., M+N.
The relative pressure of all the sensors is sorted from large to small, the relative pressure value list after sequence be Pk1,
Pk2, Pk3 ..., Pk (M+N) }, corresponding sensor number is k1, k2, k3 ..., k (M+N).
Institute is first found out compared with the sensor number for each coordinate being stored in memory sequence with sensor number sequence
There are an identical coordinate points of sensor number sequence, i.e., by the number k1, k2, k3 ... of sensor, k (M+N) and in memory
The number j1, j2, j3 ... of each coordinate point sensor, j (M+N) compare one by one, find out the coordinate of identical numbered sequence
Point, then with the corresponding relative pressure of sensor and corresponding with all coordinate points found before in each opposite of memory
Pressure value compares, △ P=(Pk1-P0j1)2+(Pk2-P0j2)2+(Pk3-P0j3)2+…+(Pk(M+N)-P0j(M+N))2,
The coordinate that △ P is minimum value is found out, this coordinate points is exactly (x, y) coordinate points that pressure is pressed.
After determining (x, y) coordinate points, calibration factor PXYlsb corresponding for (x, y) coordinate is gone out by memory look-up,
So carrying out sensitivity calibration treated pressure value is PYX=PXYtotal/PXYlsb.
The sensitivity consistency calibration method of the realized pressure touch equipment of the present invention, by each sensor coordinates
Calibration and pressure calibration, it is ensured that touch screen/Trackpad marginal position, right above the place or sensor between sensor position
The problem of setting by same pressure, obtaining same pressure value, well solved sensitivity consistency.
Detailed description of the invention
Fig. 1 is the hardware structural diagram that the present invention is implemented.
Fig. 2 is the control flow chart that the present invention is implemented.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The hardware structure diagram that Fig. 1 is implemented for the present invention, Fig. 2 show the control flow chart that the present invention is implemented.Fig. 1 institute
Show, 11 be that the touch screen or Trackpad of equipment, touch screen or Trackpad are arranged using 36 matrix form M*N distribution of pressure sensor
Cloth, wherein 24 position where pressure sensor, the distance between X-direction pressure sensor center is Q, and Y-direction pressure passes
The distance between 36 center of sensor is P.
The method that the present invention is realized includes the following steps:
201, it first determines the arrangement array of matrix form pressure touch sensor 36, determines that sensor arrangement array has determined that XY
All coordinate points that plane can identify.According to practical application scene, considers the volume and cost of pressure sensor 36, determine touch-control
The accuracy of identification for shielding X/Y plane coordinate, between m column (P=ng) are averagely divided X-direction pressure sensor 36 again, to Y-direction pressure
N row (Q=mh) averagely is divided again between sensor 36, that is, determines that X/Y plane can identify ((M-1) * m+M) * ((N-1) * n+N) a seat
Cursor position.If using the lower left corner Fig. 1 center sensor value as origin (0,0), then the coordinate that all pressure touchs recognize is all
It has defined.
202, in advance by all coordinate points Sensitivity Calibrations of X/Y plane.
All coordinate Sensitivity Calibrations are carried out to touch control device in advance.I.e. using calibration facility to the touch-control on touch control device
All coordinate points determined by screen or Trackpad apply touch screen or Trackpad one by one can identify that minimum scale division (LSB) is corresponding
One pressure, pressure-detecting device 66 detects the sum of each sensor pressure values, and records.By certain rule to all sensings
Device is numbered 1,2,3 ..., M+N, their corresponding pressure values are P01, P02, P03 ..., P0M+N.
Coordinate is that the pressure value (also referred to as calibration factor) of (x, y) corresponding minimum scale is PXYlsb=PXY1+PXY2+
PXY3+…+PXYM+N。
The corresponding relative pressure of each sensor 36 is P0i1=P01/PXYlsb；P0i2=P02/PXYlsb；…；
P0i (M+N)=P0M+N/PXYlsb.
The corresponding relative pressure of all the sensors 36 is { P0i1, P0i2, P0i3 ..., P0i (M+N) }, corresponding sensing
Device number is 1,2,3 ..., M+N.
In order to facilitate the complexity for simplifying subsequent coordinates identification, the relative pressure of all the sensors 36 is arranged from big to small
Sequence, the relative pressure value list after sequence are { P0j1, P0j2, P0j3 ..., P0j (M+N) }, and the corresponding number of sensor 36 is
j1,j2,j3,…,j(M+N)。
203, all the sensors corresponding pressure value is measured.
When touch control device works normally, controller passes through pressure detecting module in real time and measures to sensor 36, obtains
Obtain the pressure value of each sensor.
204, pressure is judged whether there is to press.
The pressure value of all the sensors 36 is added up, is saved in calibration factor most if it is larger than or equal to memory 96
Small value, then it represents that there is pressure to press, then carry out pressure-sensitivity calibration adjustment；If it is less than in the calibration factor of pressure value
Minimum value then continues to measure pressure sensor.
205, sensitivity calibration is handled, and obtains final pressure value.
When having detected that pressure is pressed, all the sensors 36 are numbered 1,2,3 ..., M+N, their corresponding pressures
Force value is P1, P2, P3 ..., PM+N.
Obtain all the sensors 36 pressure value and be PXYtotal=P01+P02+P03+ ...+P0M+N.
The coordinate (x, y) being pressed is determined later, determines xy coordinate method are as follows:
The corresponding relative pressure of each sensor 36 is Pi1=P01/PXYtotal；Pi2=P02/PXYtotal；…；
Pi (0M+N)=P0M+N/PXYtotal.
The corresponding relative pressure of all the sensors 36 is { Pi1, Pi2, Pi3 ..., Pi (M+N) }, corresponding sensor 36
Number is 1,2,3 ..., M+N.
The relative pressure of all the sensors 36 is sorted from large to small, the relative pressure value list after sequence be Pk1,
Pk2, Pk3 ..., Pk (M+N) }, the corresponding number of sensor 36 is k1, k2, k3 ..., k (M+N).
First with 36 number order of sensor compared with 36 number order of sensor there are each coordinate in memory 96,
It finds out the identical coordinate points of 36 number order of all the sensors, i.e., by the number k1, k2, k3 ... of sensor, k (M+N) and is depositing
The number j1, j2, j3 ... of each coordinate point sensor 36 in reservoir 96, j (M+N) compare one by one, find out identical volume
The coordinate points of number sequence then with the corresponding relative pressure of sensor 36 and corresponding with all coordinate points found before are being deposited
Each relative pressure of reservoir 96 compares, △ P=(Pk1-P0j1)2+(Pk2-P0j2)2+(Pk3-P0j3)2+…+(Pk(M
+N)-P0j(M+N))2, the coordinate that △ P is minimum value is found out, this coordinate points is exactly the XY coordinate points that pressure is pressed.
Calibration factor PXYlsb corresponding for (x, y) coordinate is found out by memory 96, then carrying out sensitivity school
Quasi- treated that pressure value is PYX=PXYtotal/PXYlsb, ensures that touch screen/Trackpad marginal position in this way, passes
Same pressure is pressed in place or 36 position directly above of sensor between sensor 36, is obtained same pressure value, has been well solved spirit
The problem of sensitivity consistency.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of sensitivity consistency calibration method of pressure touch equipment, it is characterised in that this method comprises the following steps:
101, it in advance by all coordinate points Sensitivity Calibrations of X/Y plane, and is stored；
102, all the sensors corresponding pressure value is measured；
When touch control device works normally, sensor is measured, the pressure value of each sensor is obtained；
103, pressure is judged whether there is to press；
104, sensitivity calibration is handled, and obtains final pressure value；
In the step 101, using calibration facility to all coordinate points determined by the touch screen or Trackpad on touch control device
The corresponding pressure of minimum scale division (LSB) can be identified by applying touch screen or Trackpad one by one, and pressure-detecting device detects each biography
The sum of sensor pressure value, and record；1,2,3 is numbered to all the sensors by certain rule ..., M+N, they are right
The pressure value answered be P01, P02, P03 ..., P0M+N；Coordinate is the pressure value of (x, y) corresponding minimum scale, is also referred to as calibrated
Coefficient is PXYlsb=PXY1+PXY2+PXY3+ ...+PXYM+N, and wherein PXY1 is the pressure of the corresponding minimum scale of sensor 1
Value ... PXYM+N is the pressure value of the corresponding minimum scale of sensor M+N；
In 104 step, when having detected that pressure is pressed, all the sensors are numbered 1,2,3 ..., M+N, they
Corresponding pressure value is P1, P2, P3 ..., PM+N；
Obtain all the sensors pressure value and be PXYtotal=P1+P2+P3+ ...+PM+N；
The coordinate (x, y) being pressed is determined later, after determining (x, y) coordinate points, is gone out by memory look-up for (x, y) coordinate
Corresponding calibration factor PXYlsb, then carrying out sensitivity calibration treated pressure value is PYX=PXYtotal/PXYlsb.
Determine (x, y) coordinate method are as follows:
The corresponding relative pressure of each sensor is Pi1=P1/PXYtotal；Pi2=P2/PXYtotal；…；Pi(M+N)
=PM+N/PXYtotal；
The corresponding relative pressure of all the sensors is { Pi1, Pi2, Pi3 ..., Pi (M+N) }, and corresponding sensor number is 1,
2,3,…,M+N；
The relative pressure of all the sensors is sorted from large to small, the relative pressure value list after sequence be Pk1, Pk2,
Pk3 ..., Pk (M+N) }, corresponding sensor number is k1, k2, k3 ..., k (M+N)；
All biographies are first found out compared with the sensor number for each coordinate being stored in memory sequence with sensor number sequence
The identical coordinate points of sensor number order, i.e., by the number k1, k2, k3 ... of sensor, k (M+N) and each of in memory
The number j1, j2, j3 ... of coordinate point sensor, j (M+N) compare one by one, find out the coordinate points of identical numbered sequence,
Then with the corresponding relative pressure of sensor and each opposite pressure in memory corresponding with all coordinate points found before
Force value compares, △ P=(Pk1-P0j1)2+(Pk2-P0j2)2+(Pk3-P0j3)2+…+(Pk(M+N)-P0j(M+N))2, look for
△ P is the coordinate of minimum value out, this coordinate points is exactly (x, y) coordinate points that pressure is pressed.
2. the sensitivity consistency calibration method of pressure touch equipment as described in claim 1, it is characterised in that the number,
Pressure value and calibration factor are stored, and write power down nonvolatile memory by controller, in order to carry out sensitivity school
It is quasi-.
3. the sensitivity consistency calibration method of pressure touch equipment as described in claim 1, it is characterised in that 103 step
In rapid, the pressure value of all the sensors is added up, saves the minimum value in calibration factor if it is larger than or equal to memory, then
It indicates that pressure is pressed, then carries out pressure-sensitivity calibration adjustment；If it is less than the minimum value in calibration factor, then continue pair
Pressure sensor measures.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3407169A4 (en) | 2016-11-08 | 2019-04-17 | Shenzhen Goodix Technology Co., Ltd. | Method for determining change in initial distance of sensing electrode |
| JP6900763B2 (en) * | 2017-04-18 | 2021-07-07 | ティアック株式会社 | Electronics |
| CN107678594A (en) * | 2017-09-30 | 2018-02-09 | 努比亚技术有限公司 | Calibration method, device, terminal device and the storage medium of touch screen |
| CN107765918B (en) * | 2017-10-18 | 2021-02-09 | 广州视源电子科技股份有限公司 | Method and system for optimizing edge touch effect of capacitive touch screen |
| CN110672262B (en) * | 2018-07-03 | 2021-04-23 | Oppo广东移动通信有限公司 | Pressure key threshold calibration method and device, storage medium and electronic equipment |
| CN111176473B (en) * | 2018-11-12 | 2024-05-24 | 北京钛方科技有限责任公司 | Pressing force identification method and system of touch pad |
| CN109342984A (en) * | 2018-11-16 | 2019-02-15 | 南方电网科学研究院有限责任公司 | Temperature and humidity influence correction compensation system and method for magnetic resistance chip |
| CN114323422B (en) * | 2020-10-12 | 2023-09-29 | 北京钛方科技有限责任公司 | Method, terminal and storage medium for detecting strength |
| CN112558791B (en) * | 2020-12-17 | 2022-11-01 | 深圳市汇顶科技股份有限公司 | Pressure calibration method, test machine, touch chip and touch panel |
| WO2022126468A1 (en) * | 2020-12-17 | 2022-06-23 | 深圳市汇顶科技股份有限公司 | Pressure calibration method, test machine, touch-control chip and touch panel |
| CN113419646B (en) * | 2021-06-03 | 2023-05-16 | 维沃移动通信有限公司 | Calibration method and device of pressure sensing channel and electronic equipment |
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