WO2022126468A1

WO2022126468A1 - Pressure calibration method, test machine, touch-control chip and touch panel

Info

Publication number: WO2022126468A1
Application number: PCT/CN2020/137103
Authority: WO
Inventors: 邓仁雄; 黄海泉; 鲁旭
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2022-06-23

Abstract

A pressure calibration method applied to a touch panel (20), and a test machine, a touch-control chip and the touch panel (20). The touch panel (20) comprises N pressure sensors (21) below same and an actuator (26), wherein the actuator (26) is used for performing tactile feedback according to the magnitude of a calibrated pressure, and N > 1. The method comprises: sequentially placing a first heavy object (22) N times at N different nodes (23) pre-arranged on the touch panel (20), wherein the weight of the first heavy object (22) placed each time is the same (S310); every time the first heavy object (22) is placed, receiving, at the same time, first pressure values output by the N pressure sensors (21) (S320); and calculating N first pressure calibration coefficients according to the received first pressure values output by the N pressure sensors (21) and a first preset value (S330), wherein the N first pressure calibration coefficients are used for calibrating the magnitude of the pressure on the touch panel (20), and the first preset value is greater than 0. According to the pressure calibration method, the consistency of the pressure on the whole touch panel (20) can be improved, thereby improving the user experience.

Description

Pressure calibration method, testing machine, touch chip and touch panel

technical field

The embodiments of the present application relate to applications in the field of pressure calibration, and more particularly, to a pressure calibration method, a testing machine, a touch chip, and a touch panel.

Background technique

FIG. 1 is a schematic diagram of the structure of a traditional touchpad. The traditional touchpad 10 is usually provided with a key area 11. The key area includes left and right buttons, which are used as the left and right buttons of the mouse, respectively. Due to the limited mechanical structure, As a result, the traditional touchpad has a button blind area, that is, a part of the area cannot press the button.

Compared with the traditional touchpad, the pressure touchpad cancels the mechanical and physical keys, and the pressing of the keys can be realized on the entire pressure touchpad. In order to maintain a consistent pressing feel, it is expected that at different positions of the touchpad, with the same pressing force, the detected pressure is the same. Due to the mechanical installation error and the sensitivity difference of the pressure sensor, when the same pressure is used in different positions of the touchpad, there is a large error in the detected pressure, which affects the pressing feel, resulting in some areas requiring gravity to be pressed to trigger. key, and some areas only need to be pressed lightly to trigger the key, which greatly reduces the user experience.

Application content

Embodiments of the present application provide a pressure calibration method, a testing machine, a touch control chip and a touch panel, which reduce pressure errors and achieve a consistent pressing feel on the entire touch panel.

In a first aspect, a pressure calibration method is provided, which is applied to a touchpad. The touchpad includes N pressure sensors and an actuator under the touchpad, and the actuator is used to perform tactile feedback according to the calibrated pressure, N> 1, the method includes:

N different nodes preset on the touchpad are sequentially placed with the first heavy object N times, and the weight of the first heavy object is the same each time;

Each time the first heavy object is placed, the first pressure values output by the N pressure sensors are simultaneously received;

calculating N first pressure calibration coefficients according to the received first pressure values and the first preset values output by the N pressure sensors;

The N first pressure calibration coefficients are used to calibrate the pressure on the touch panel, and the first preset value is greater than 0.

In the pressure calibration method in this embodiment of the present application, the first heavy objects are sequentially placed N times at different nodes on the touch panel, and the first pressure values output by N pressure sensors are simultaneously received. value to calculate the first pressure calibration value, which reduces the pressure error and can improve the consistency of the pressure on the entire touchpad. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold to ensure the consistency of the entire touchpad. The pressing feel improves the user experience.

In a possible implementation manner, the touchpad includes four pressure sensors, and the four pressure sensors are located at four corners below the touchpad.

In a possible implementation manner, the different nodes preset on the touchpad to sequentially place heavy objects N times include:

Place heavy objects four times in sequence on the four corners above the touchpad or on the four sides of the touchpad.

In a possible implementation, the method further includes:

Set M different nodes on the touchpad in advance;

Compensation reference coefficients of the M different nodes are calculated according to the M different nodes.

In a possible implementation manner, the calculating, according to the M different nodes, the compensation reference coefficients of the M different nodes includes:

The second weights are sequentially placed M times on M different nodes on the touch panel, and the calculation of the compensation reference coefficients of the M different nodes according to the M different nodes includes:

The second heavy objects are placed M times in sequence on M different nodes preset on the touchpad, and the weight of the second heavy objects is the same each time;

Each time the heavy object is placed, the second pressure values output by the N pressure sensors are simultaneously received;

Compensation reference coefficients of the M different nodes are calculated, where the compensation reference coefficients of the M different nodes are related to the second pressure value and a second preset value, and the second preset value is greater than 0.

In a possible implementation manner, the calculating the compensation reference coefficients of the M different nodes includes:

obtaining reference pressure values of the M different nodes according to the N first pressure calibration coefficients and the second pressure values output by the N pressure sensors;

Compensation reference coefficients of the M different nodes are calculated according to the reference pressure value and the second preset value, where the second preset value is greater than 0.

In a possible implementation manner, the weight of the first preset value and the first weight are equal.

In a possible implementation manner, the weight of the second preset value and the second weight are equal.

In a second aspect, a pressure calibration method is provided, which is applied to a touchpad. The touchpad includes N pressure sensors and an actuator under the touchpad, and the actuator is used to perform haptic feedback according to the calibrated pressure, N> 1, the method includes:

receiving the pressure values output by the N pressure sensors;

calculating a reference pressure value according to the pressure value and the N first pressure calibration coefficients;

The pressure on the touch panel is calibrated according to the reference pressure value.

In a possible implementation, the method further includes:

Set M different nodes on the touchpad in advance;

According to the M different nodes, the touchpad area is divided into O sub-areas, and each of the sub-areas is composed of I nodes, and I<M.

In a possible implementation, the method further includes:

calculating the coordinates of the object on the touchpad;

According to the coordinates of the object, determine the sub-region where the object is located on the touchpad;

The second pressure calibration coefficient is calculated according to the compensation reference coefficients of the I nodes of the sub-region.

In a possible implementation manner, the determining of the second pressure calibration coefficient of the region according to the compensation reference coefficients of I nodes of the sub-region includes:

In the sub-area, a node on the touch panel that is closest to the coordinates of the object is determined, and the compensation coefficient of the closest node is the second pressure calibration coefficient.

In a possible implementation manner, the determining of the second pressure calibration coefficient of the region according to the compensation reference coefficients of I nodes in the region includes:

Calculate the average value of the compensation reference coefficients of the I nodes, and the average value is the second pressure calibration coefficient.

Calculate the average value of the compensation reference coefficient of the I nodes, and the average value is the second pressure calibration coefficient

According to the compensation reference coefficients at both ends of the X direction and/or the Y direction of the sub-area, insert a plurality of compensation coefficients in the sub-area, and determine the corresponding node of the object where the object is located according to the node where the object is located on the touch panel. The compensation coefficient of is the second pressure calibration coefficient.

In a possible implementation manner, the calibrating the pressure on the touch panel according to the reference pressure value includes:

The pressure on the touch panel is calibrated according to the second pressure calibration coefficient and the reference pressure value.

By calculating the second pressure calibration coefficient, the pressure on the touch panel is calibrated, so that the pressure error after calibration is smaller.

In one possible implementation, I=4.

In one possible implementation, O=16.

In a possible implementation, M=25.

The pressure calibration method in the embodiment of the present application calculates a reference pressure value by receiving the first pressure values and N first pressure calibration coefficients output by N pressure sensors, and calibrates the touch panel according to the reference pressure value It reduces the pressure error and improves the consistency of the pressure on the entire touchpad. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold, which ensures a consistent pressing feel on the entire touchpad and improves the user experience.

In a third aspect, a testing machine is provided, which is applied to pressure calibration on a touch panel and performs the method in the first aspect or any possible implementation manner of the first aspect.

The testing machine in the embodiment of the present application, by performing the pressure calibration method, reduces the pressure error, and can improve the consistency of the pressure on the entire touch panel. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold to ensure that A consistent pressing feel on the entire touchpad improves user experience.

In a fourth aspect, a touch control chip is provided, which is applied to pressure calibration on a touch panel and executes the method in the second aspect or any possible implementation manner of the second aspect.

The touch chip in the embodiment of the present application reduces the pressure error by implementing the pressure calibration method, and can improve the consistency of the pressure on the entire touch panel. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold.

According to a fifth aspect, a touch panel is provided, including the touch control chip described in the fourth aspect, a pressure sensor, and an actuator, wherein the actuator is configured to perform calibration according to the calibrated pressure output by the touch control chip. Haptic feedback.

The touch panel in the embodiment of the present application includes a touch chip for executing the pressure calibration method, which can calibrate the pressure, reduce the pressure error, and improve the consistency of the pressure on the entire touch panel. value and pressure threshold, and perform vibration feedback to ensure a consistent pressing feel on the entire touchpad and improve user experience.

Description of drawings

FIG. 1 is a simplified schematic diagram of a touch panel in the prior art.

FIG. 2 is a schematic structural diagram of a touch panel in an embodiment of the present application.

FIG. 3 is a flowchart of a pressure calibration method for a touch panel in an embodiment of the present application.

FIG. 4 is a schematic diagram of applying a first weight on a touch panel in an embodiment of the present application.

FIG. 5 is a flowchart of a pressure calibration method for a touch panel in another embodiment of the present application.

FIG. 6 is a specific flowchart of step S350 of the pressure calibration method of the touch panel in another embodiment of the present application.

FIG. 7 is a specific flowchart of step S3503 of the pressure calibration method of the touch panel in another embodiment of the present application.

FIG. 8 is a schematic diagram of applying a second weight on the touch panel according to another embodiment of the present application.

FIG. 9 is a flowchart of a pressure calibration method for a touch panel performed by a chip in another embodiment of the present application.

FIG. 10 is a partial flowchart of a method for pressure calibration of a touch panel performed by a chip in another embodiment of the present application.

FIG. 11 is a schematic diagram of setting nodes on a touch panel in another embodiment of the present application.

FIG. 12 is a schematic diagram of a method for calculating a second pressure calibration coefficient performed by a chip in another embodiment of the present application.

FIG. 13 is a schematic diagram of an object touching the touchpad in another embodiment of the present application.

FIG. 14 is a schematic diagram of calculating the second pressure calibration coefficient by the bilinear interpolation method in another embodiment of the present application.

FIG. 15 is a schematic structural diagram of a touch panel in another embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

As shown in FIG. 2 is a schematic diagram of the structure of the touchpad. The bottom of the touchpad 20 includes four pressure sensors 21 and an actuator 26. In order to ensure that each position on the touchpad 20 can measure the pressure, the pressure sensors 21 are respectively set at the 4 corners of the touchpad 20. The actuator 26 is arranged at the center of the touch panel, and is used for vibration feedback according to the pressure magnitude and pressure threshold output by the pressure sensor 21 . When an object is pressed on the touch panel 20, the touch chip collects the pressure values W ₁ -W ₄ of the four pressure sensors, and accumulates the pressure values W ₁ -W ₄ of the pressure sensors to obtain the pressure measurement value W _b . The pressure measurement W _b should be equal to the actual weight W _a of the object. Due to the difference in sensitivity of each pressure sensor and the tolerance caused by the installation of the touchpad, when an object of the same weight is pressed on the touchpad 20, the pressure output by the pressure sensors 21 arranged at different positions is quite different. There is a big difference between the W _b and the actual weight W _a .

To this end, an embodiment of the present application provides a pressure calibration method applied to a touch panel, the method comprising:

S310 , place the first heavy object N times in sequence on N different nodes preset on the touch panel, and the weight of the first heavy object is the same each time.

S320, each time the first heavy object is placed, simultaneously receive the first pressure values output by the N pressure sensors.

S330: Calculate N first pressure calibration coefficients according to the received first pressure values and the first preset value output by the N pressure sensors.

The first pressure calibration coefficient is used to calibrate the pressure on the touch panel, and the first preset value is greater than 0.

In S310, N different nodes are preset on the touch panel. The node can be understood as a specific position on the touch panel, and only the first heavy object needs to be placed on different nodes. Preferably, different nodes The distance between them is long, so that the final measured error is smaller. Taking N equal to 4 as an example, as shown in Figure 4, the first weight 22 can be placed four times in sequence at the node 23 of the four sides above the touchpad, or The first weights 22 are placed four times in sequence at the nodes of the four corners of the touchpad. In the embodiment of the present application, placing the first weights 22 sequentially four times can be understood as placing the first weights 22 in sequence clockwise, or placing them in sequence counterclockwise, or placing the upper left corner for the first time, the lower right corner for the second time, and the upper right corner for the third time, The lower left corner is placed for the fourth time, and the embodiment of the present application does not limit the specific position where the first weight 22 is placed and the order in which it is placed in sequence.

The embodiment of the present application is described by taking the example of placing the first heavy objects 22 four times in sequence at the nodes 23 of the four sides of the touchpad 20. As shown in FIG. 4 , in S320, each time the first heavy objects 22 are placed, four heavy objects 22 are placed The pressure sensor 21 outputs the first pressure value at the same time, and the chip under the touchpad 20 receives the first pressure value output by the four pressure sensors. The chip can process the first pressure value to obtain the first pressure calibration value, or the chip can process the first pressure value. After processing, it is output to the testing machine, and the testing machine obtains the first pressure calibration value according to the processed first pressure value. Therefore, step S320 can be completed by a testing machine or a chip. If it is completed by a testing machine, the storage space of the chip can be reduced, and the cost of the chip can be reduced.

In S330, N first pressure calibration coefficients are calculated according to the first preset value and the first pressure value, where the first pressure value refers to the first pressure value simultaneously output by the N pressure sensors. This step can be done by a tester or by a chip. The first preset value is preset in the tester and/or the chip. Preferably, for the convenience of calculation, the first preset value W and the weight of the first weight 22 are set to be equal. Substitute the first preset value W and the first pressure value W ₁ -W _N into the formula:

W=k ₁ W ₁ +k ₂ W ₂ +k ₃ W ₃ +…k _N W _N ,

Wherein, the first pressure calibration coefficient k ₁ -k _N is greater than 0. Since N first pressure calibration coefficients k ₁ -k _N need to be calculated, the chip or the testing machine needs to obtain the first pressure values W ₁ -W _N output by the pressure sensor N times. Taking N equal to 4 as an example, the chip successively receives the first pressure values output by the pressure sensors 21 four times, the first pressure values of the four pressure sensors 21 are collected W ₁₁ to W ₄₁ for the first time, and the first pressure values of the four pressure sensors 21 are collected for the second time. The first pressure values of the sensors 21 are W ₁₂ to W ₄₂ , the first pressure values of the four pressure sensors 21 collected for the third time are W ₁₃ to W ₄₃ , and the first pressure values of the four pressure sensors 21 collected for the fourth time are W 13 to W 43 . W ₁₄ to W ₄₄ . The first pressure calibration coefficients k ₁ to k ₄ can be solved by substituting into the following equations.

W=k ₁ W ₁₁ +k ₂ W ₂₁ +k ₃ W ₃₁ +k ₄ W ₄₁

W=k ₁ W ₁₂ +k ₂ W ₂₂ +k ₃ W ₃₂ +k ₄ W ₄₂

W=k ₁ W ₁₃ +k ₂ W ₂₃ +k ₃ W ₃₃ +k ₄ W ₄₃

W=k ₁ W ₁₄ +k ₂ W ₂₄ +k ₃ W ₃₄ +k ₄ W ₄₄

The number of pressure sensors is equal to the number of the first pressure calibration coefficients, and by placing the first weight at different positions on the touchpad 20 the number of times and the first pressure calibration coefficients are equal, according to the received first pressure sensor output. The first pressure calibration coefficient can be obtained from the pressure value. The touch chip calibrates the pressure pressed on the touchpad through the first pressure calibration coefficient to reduce the pressure error and improve the consistency of the pressure on the entire touchpad. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold. For example, the chip compares the calibrated pressure value with a preset pressure threshold, and if the calibrated pressure value is greater than the pressure threshold, it outputs an actuation signal to the actuator, and the actuator performs vibration feedback. The pressure sensor calibration method ensures a consistent pressing feel on the entire touch panel and improves user experience.

For a touchpad with good rigidity, after the above-mentioned linear normalization correction, the error can be controlled to be about 5%-10%, and a better pressure detection consistency can be achieved on the touchpad. The difference in pressure detection can be controlled within a relatively small range to achieve a small error. However, the field of consumer electronics is constantly pursuing thinning. After the thickness of the touchpad is reduced, the rigidity of the touchpad is affected to a certain extent. For example, when the pressure sensors are located at the four corners of the touchpad, the middle area of the touchpad is affected by the object. The pressure will cause a certain collapse and deformation in the middle area, which seriously affects the pressure detection accuracy of the middle area of the touchpad. Even after the above linear normalization, the error is as high as 20%.

The pressure detection deviation caused by the collapse and deformation of the touch panel is usually nonlinear, or completely irregular, and cannot be corrected at one time by the above-mentioned linearization method. In a preferred embodiment, a pressure estimation compensation method is introduced for calculation, and after the above steps S310-S330 are completed, the method further includes

S340, set M different nodes on the touch panel in advance.

S350: Calculate compensation reference coefficients of the M different nodes according to the M different nodes.

The embodiment of the present application can further calibrate the pressure detection deviation caused by the collapse and deformation of the touchpad by further calculating the compensation reference coefficients of M different nodes, so that when the object presses the touchpad, the pressure error is smaller, and the pressure error is 5%- 10%, this method can better accommodate thinner touchpads.

In S350, calculating the compensation reference coefficients of the M different nodes according to the M different nodes specifically includes:

S3501 , place the second heavy object M times in sequence on M different nodes preset on the touch panel, and the weight of the second heavy object is the same each time.

S3502, each time the second heavy object is placed, simultaneously receive the second pressure values output by the N pressure sensors.

S3503: Calculate compensation reference coefficients of the M different nodes, where the compensation reference coefficients of the M different nodes are related to the second pressure value and a second preset value, and the second preset value is greater than 0.

A weight is applied on the touch panel again, and compensation reference coefficients of M different nodes are calculated, and the compensation reference coefficients of the M different nodes are related to the second pressure value and the second preset value. The calculation process can be completed by the testing machine, and can also be completed by the chip. If completed by the testing machine, the storage space of the chip can be reduced, and the cost of the chip can be reduced. The "chip" in this application can be understood as a "touch chip".

In S3503, the compensation reference coefficients of the M different nodes are calculated, the compensation reference coefficients of the M different nodes are related to the second pressure value and the second preset value, and the second preset value is greater than 0 , including:

S35031: Acquire reference pressure values of the M different nodes according to the N first pressure calibration coefficients and the second pressure values output by the N pressure sensors.

S35032: Calculate compensation reference coefficients of the M different nodes according to the reference pressure value and the second preset value.

In a specific implementation, taking M=9 and N=4 as an example for illustration, as shown in FIG. 8 , the four pressure sensors (not shown in the figure) below the touchpad are Set 9 nodes 1-9, respectively apply the second weight 82 on these 9 nodes in turn, each time the second weight 82 is applied, the 4 pressure sensors output the second pressure values W ₁ -W ₄ , record 9 For the second pressure value output by the secondary pressure sensor, substitute the second pressure value W ₁ -W ₄ and the first pressure calibration coefficient k ₁ -k ₄ into the formula: W _m =k ₁ W ₁ +k ₂ W ₂ +k ₃ W ₃ +k ₄ W ₄ , calculate the reference pressure value W _m , the reference pressure value W _m at the 9 nodes can be obtained, at this time, the obtained reference pressure value W _m still has errors, and the reference pressure value can be further calibration.

Substitute the reference pressure value W _m and the second preset value W _n into the formula:

The compensation reference coefficient k _c of each node is obtained by calculation, and the compensation reference coefficients k _c1 to k _c9 of 9 nodes can be calculated by the above formula. The second preset value W _n is related to the weight of the second weight 82 . For the convenience of calculation, the second preset value W _n and the weight of the second weight are set to be equal.

In the above embodiment, the process of calculating the reference pressure value W _m and the compensation reference coefficient k _c can be completed by a testing machine or a chip. Preferably, the calculation process is completed by a testing machine, which can reduce the storage space of the chip. Reduced chip cost.

The chip needs to obtain the first pressure calibration coefficient and compensation reference coefficient before leaving the factory. The first pressure calibration coefficient and compensation reference coefficient can be obtained by the chip through processing and calculation, or can be processed and calculated by the testing machine and then transmitted to the chip through the communication line. The chip calibrates the pressure value of the object (eg, finger) pressed on the touch panel according to the obtained first pressure calibration coefficient and the compensation reference coefficient, which can reduce the pressure error.

The present application also provides a pressure calibration method applied to a touch panel, the method comprising:

S910: Receive the third pressure values output by the N pressure sensors.

S920: Calculate a reference pressure value according to the third pressure value and the N first pressure calibration coefficients.

S930, calibrate the pressure on the touch panel according to the reference pressure value.

In one embodiment, the N first pressure calibration coefficients k ₁ -k _N and the first pressure values W ₁ -W _N are substituted into the formula:

W _m =k ₁ W ₁ +k ₂ W ₂ +k ₃ W ₃ +...k _N W _N ,

The reference pressure value W _m can be obtained.

The first pressure calibration coefficients k ₁ -k _N are calculated by the above-mentioned methods S310-S330. The calculation may be completed by the chip, or after the test machine is completed, it may be transmitted to the chip through a communication line, such as I ₂ C, and the chip will then The reference pressure value is calculated according to the third pressure value output by the pressure sensor and the first pressure calibration coefficient.

For a touchpad with good rigidity, the reference pressure value calculated according to the third pressure value output by the pressure sensor and the first pressure calibration coefficient has a small error, which can be controlled at about 5%-10%, which can achieve a relatively low error. With good pressure detection consistency, the pressure detection differences at different positions in the touchpad can be controlled within a relatively small range, so as to achieve a small error. However, the field of consumer electronics is constantly pursuing thinning. After the thickness of the touchpad is reduced, the rigidity of the touchpad is affected to a certain extent. For example, when the pressure sensors are located at the four corners of the touchpad, the middle area of the touchpad is affected by the object. The pressure will cause a certain collapse and deformation in the middle area, which seriously affects the pressure detection accuracy of the middle area of the touchpad. Even with the reference pressure value obtained through the above processing, the error is as high as 20%.

The pressure detection deviation caused by the collapse and deformation of the touch panel is usually nonlinear or completely irregular, and cannot be corrected at one time through the above-mentioned processing. In a preferred embodiment, further calibration needs to be performed by looking up a table, and the method further includes:

S1010, set M different nodes on the touch panel in advance.

S1020, according to the M different nodes, divide the touchpad area into O sub-areas, each of the sub-areas is composed of I nodes, and I<M.

As shown in Figure 11, taking M equal to 25, O equal to 16, and I equal to 4 as an example, 25 nodes are set on the touchpad in advance, and the 25 nodes divide the touchpad into 16 sub-areas, each sub-area consists of It consists of 4 nodes. The method also includes:

S1210, calculate the coordinates of the object on the touch panel.

S1220, according to the coordinates of the object, determine the sub-region where the object is located on the touchpad.

S1230: Calculate a second pressure calibration coefficient according to the compensation reference coefficients of the I nodes in the sub-region.

In S1230, the method for calculating the second pressure calibration coefficient may be, for example, a nearest neighbor interpolation method, an averaging method, a bilinear interpolation method, or the like.

The nearest neighbor interpolation method is: after determining the sub-area where the object coordinates are located, determine the node of the sub-area that is closest to the object coordinates on the touchpad, and the compensation coefficient of the nearest node of the sub-area is the second pressure Calibration factor.

The averaging method is to calculate the average value of the compensation reference coefficients of I nodes in the sub-region, and the average value is the second pressure calibration coefficient.

The bilinear interpolation method is to insert a plurality of compensation coefficients in the sub-area according to the compensation reference coefficients at both ends of the X direction and/or the Y direction of the sub-area, and determine the The compensation reference coefficient corresponding to the node where the object is located is a second pressure calibration coefficient.

As shown in Figure 13, assuming that the compensation reference coefficients at the 25 nodes have been calculated, the compensation reference coefficients of the 5 nodes in the first row are 1.07, 1.08, 1.15, 1.13, and 1.05, respectively, and the 5 nodes in the second row. The compensation reference coefficients are 1.23, 1.17, 1.19, 1.23, 1.31 respectively, the compensation reference coefficients of the 5 nodes in the third row are 1.25, 1.30, 1.24, 1.30, 1.33 respectively, and the compensation reference coefficients of the 5 nodes in the fourth row are They are 1.22, 1.22, 1.15, 1.16, and 1.26, respectively, and the compensation reference coefficients of the five nodes in the fifth row are 1.00, 1.11, 1.09, 0.96, and 1.03, respectively.

The following takes the nearest neighbor interpolation method, the average method, and the bilinear interpolation method as examples for description.

In the nearest neighbor interpolation method, the coordinates of the object 30 are first determined, and the sub-region on the touchpad where the object 30 is located is 6 according to the coordinates. The sub-region 6 includes 4 nodes, and the compensation reference coefficients of the 4 nodes are 1.17 respectively. , 1.19, 1.30, 1.24, determine that the node closest to the coordinates of the object 30 on the touch panel is the node in the upper right corner, and the compensation reference coefficient of this node is 1.19, so the compensation reference coefficient 1.19 is determined as the second pressure calibration coefficient. However, if the calculated coordinates are located at the center of area 6, then the four nodes of sub-area 6 are at the same distance from the center, which will cause the compensation reference coefficient of object 30 to not stop at one of the four compensation reference coefficients at the four nodes. changes from time to time, resulting in data jitter

In the averaging method, the coordinates of the object 30 are first determined, and the sub-region on the touchpad where the object 30 is located is determined as 6 according to the coordinates of the object. The sub-region 6 includes 4 nodes, and the compensation reference coefficients of the 4 nodes are 1.17 and 1.19 respectively. , 1.30, 1.24, calculate the average value of the compensation reference coefficients of the four nodes in the sub-region, where the average value is the second pressure calibration coefficient. However, when the calculated position of the object 30 is at the boundary of the sub-region, there will also be a problem of data jitter.

In the bilinear interpolation method, the coordinates of the object 30 are first determined, and according to the coordinates, the sub-area on the touchpad where the object 30 is located is 6, and the sub-area 6 includes 4 nodes, and the compensation reference coefficients of the 4 nodes are 1.17, 1.19, 1.30, 1.24, as shown in FIG. 14, according to the compensation reference coefficients at both ends of the X direction and/or the Y direction of the subregion, in the subregion, insert a plurality of compensation coefficients, for example, according to the X direction The compensation reference coefficients are 1.17, 1.19, and 3 compensation coefficients 1.175, 1.18, and 1.185 are inserted, so that the compensation coefficient in the X direction changes linearly. The coefficients are 1.2025, 1.235, and 1.2675, so that the compensation coefficient in the Y direction changes linearly and incrementally. In a preferred embodiment, according to the number of coordinates on the touch panel, each coordinate corresponds to a node, and the node includes a compensation reference coefficient. Then, according to the compensation reference coefficient at the node where the object 30 is located on the touch panel, the compensation reference coefficient corresponding to the node where the object is located is determined as the second pressure calibration coefficient, and the second pressure calibration coefficient at the object 30 is 1.2025. Compared with the average method and the nearest neighbor method, the bilinear interpolation method can avoid the problem of data jitter.

After the second pressure calibration coefficient is determined, the magnitude of the pressure pressed by the object on the touch panel is calibrated according to the second pressure calibration coefficient and the reference pressure value. Specifically, the second pressure calibration coefficient k'c and the reference pressure value W _m are substituted into the formula: W' _m =k' _c *W _m , where W _m =k ₁ W ₁ +k ₂ W ₂ +k ₃ W ₃ +k ₄ W ₄ , the calibrated pressure magnitude W′ _m is obtained by calculation. The actuator provides vibration feedback based on the calibrated pressure value and pressure threshold. For example, the chip compares the calibrated pressure value with a preset pressure threshold, and if the calibrated pressure value is greater than the pressure threshold, outputs an actuation signal to the actuator, and the actuator performs vibration feedback.

The pressure calibration method in this embodiment of the present application calculates a reference pressure value by receiving third pressure values and N first pressure calibration values output by N pressure sensors, and calibrates the touch panel according to the reference pressure value It can reduce the pressure error and improve the consistency of the pressure on the entire touch panel. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold. The pressure sensor calibration method ensures a consistent pressing feel on the entire touch panel and improves user experience.

The embodiment of the present application provides a testing machine, which is applied to pressure calibration on a touch panel and implements any one of the above embodiments. The testing machine in the embodiment of the present application reduces the pressure error by performing the pressure calibration method, and can improve the consistency of the pressure on the entire touch panel. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold. The pressure sensor calibration method ensures a consistent pressing feel on the entire touch panel and improves user experience.

An embodiment of the present application provides a touch chip, which is applied to pressure calibration on a touch panel and implements any one of the foregoing embodiments. The chip in the embodiment of the present application, by performing the pressure calibration method, reduces the pressure error, and can improve the consistency of the pressure on the entire touch panel, and the actuator performs vibration feedback according to the calibrated pressure value and pressure threshold. The pressure sensor calibration method ensures a consistent pressing feel on the entire touch panel and improves user experience.

An embodiment of the present application provides a touchpad 150 . The touchpad 150 includes the above-mentioned touch chip 1501 , a pressure sensor 1502 and an actuator 1503 , and the actuator 1503 is used for post-calibration based on the output of the touch chip. The amount of pressure for haptic feedback. The touchpad in the embodiment of the present application can calibrate the pressure, reduce the pressure error, and improve the consistency of the pressure on the entire touchpad. The actuator performs vibration feedback according to the calibrated pressure value and pressure threshold, ensuring that The consistent pressing feel on the entire touchpad improves the user experience.

It should be noted that, on the premise of no conflict, each embodiment described in this application and/or the technical features in each embodiment can be arbitrarily combined with each other, and the technical solution obtained after the combination should also fall within the protection scope of this application .

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application, and those skilled in the art can Various improvements and modifications can be made, and these improvements or modifications all fall within the protection scope of the present application.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A pressure calibration method, applied to a touch panel, characterized in that, N pressure sensors and actuators are included under the touch panel, and the actuators are used to perform tactile feedback according to the calibrated pressure, N>1, The method includes:

N different nodes preset on the touchpad are sequentially placed with the first heavy object N times, and the weight of the first heavy object is the same each time;

Each time the first heavy object is placed, simultaneously receive the first pressure values output by the N pressure sensors;

calculating N first pressure calibration coefficients according to the received first pressure values and the first preset values output by the N pressure sensors;

The N first pressure calibration coefficients are used to calibrate the pressure on the touch panel, and the first preset value is greater than 0.
The pressure calibration method according to claim 1, wherein the touchpad comprises 4 pressure sensors, and the 4 pressure sensors are located at 4 corners below the touchpad.
The pressure calibration method according to claim 2, wherein the step of sequentially placing heavy objects N times on different nodes preset on the touchpad comprises:

Place heavy objects four times in sequence on the four corners above the touchpad or on the four sides of the touchpad.
The pressure calibration method according to claim 1, wherein the method further comprises:

Setting M different nodes on the touch panel in advance;

Compensation reference coefficients of the M different nodes are calculated according to the M different nodes.
The pressure calibration method according to claim 4, wherein calculating the compensation reference coefficients of the M different nodes according to the M different nodes comprises:

The second heavy objects are placed M times in sequence on M different nodes preset on the touchpad, and the weight of the second heavy objects is the same each time;

Each time the second heavy object is placed, simultaneously receive the second pressure values output by the N pressure sensors;

Compensation reference coefficients of the M different nodes are calculated, where the compensation reference coefficients of the M different nodes are related to the second pressure value and a second preset value, and the second preset value is greater than 0.
The pressure calibration method according to claim 5, wherein the calculating the compensation reference coefficients of the M different nodes comprises:

obtaining reference pressure values of the M different nodes according to the N first pressure calibration coefficients and the second pressure values output by the N pressure sensors;

Compensation reference coefficients of the M different nodes are calculated according to the reference pressure value and the second preset value.
The pressure calibration method according to claim 1, wherein the first preset value is equal to the weight of the first weight.
The pressure calibration method according to claim 5, wherein the second preset value is equal to the weight of the second weight.
A pressure calibration method, applied to a touch panel, characterized in that, N pressure sensors and actuators are included under the touch panel, and the actuators are used to perform tactile feedback according to the calibrated pressure, N>1, The method includes:

receiving the third pressure values output by the N pressure sensors;

calculating a reference pressure value according to the third pressure value and the N first pressure calibration coefficients;

According to the reference pressure value, the pressure on the touch panel is calibrated.
The pressure calibration method according to claim 9, wherein the touchpad comprises 4 pressure sensors, and the 4 pressure sensors are located at 4 corners below the touchpad.
The pressure calibration method according to claim 9, wherein the method further comprises:

Setting M different nodes on the touch panel in advance;

According to the M different nodes, the touchpad area is divided into O sub-areas, and each of the sub-areas is composed of I nodes, and I<M.
The pressure calibration method according to claim 11, wherein the method further comprises:

calculating the coordinates of the object on the touchpad;

According to the coordinates of the object, determine the sub-region where the object is located on the touchpad;

The second pressure calibration coefficient is calculated according to the compensation reference coefficients of the I nodes of the sub-region.
The pressure calibration method according to claim 12, wherein the determining the second pressure calibration coefficient of the region according to the compensation reference coefficients of I nodes of the sub-region comprises:

In the sub-area, the node of the sub-area that is closest to the coordinates of the object on the touch panel is determined, and the compensation reference coefficient of the node of the closest sub-area is the second pressure calibration coefficient.
The pressure calibration method according to claim 12, wherein the determining the second pressure calibration coefficient of the region according to the compensation reference coefficients of I nodes of the sub-region comprises:

Calculate the average value of the compensation reference coefficients of the I nodes, and the average value is the second pressure calibration coefficient.
The pressure calibration method according to claim 12, wherein the determining the second pressure calibration coefficient of the region according to the compensation reference coefficients of I nodes of the sub-region comprises:

According to the compensation reference coefficients at both ends of the X direction and/or the Y direction of the sub-area, insert a plurality of compensation coefficients in the sub-area, and determine the corresponding node of the object on the touch panel according to the node where the object is located The compensation coefficient of is the second pressure calibration coefficient.
The pressure calibration method according to any one of claims 9-15, wherein the calibrating the pressure on the touch panel according to the reference pressure value comprises:

The pressure on the touch panel is calibrated according to the second pressure calibration coefficient and the reference pressure value.
The pressure calibration method according to any one of claims 9-15, wherein I=4.
The pressure calibration method according to any one of claims 9-15, wherein O=16.
The pressure calibration method according to any one of claims 9-15, wherein M=25.
A testing machine, which is applied to pressure calibration on a touch panel, is characterized in that the method according to any one of claims 1-8 is performed.
A touch chip, which is applied to pressure calibration on a touch panel, is characterized in that the method according to any one of claims 9-19 is performed.
A touch panel, characterized in that it comprises the touch control chip as claimed in claim 21, a pressure sensor and an actuator, wherein the actuator is used for performing haptic feedback according to the calibrated pressure output by the touch control chip .