TW201741831A - Touch panel, electronic device and method of three-point touch measuring - Google Patents

Abstract

The present invention provides a touch panel with a touch region and trace region surrounding the touch region. The touch panel includes a cover and a sensing structure. The cover has first and second opposed surfaces. The sensing structure is disposed on the second surface. At least a piezo-resistive layer is disposed on the second surface corresponding to the trace region. Each piezo-resistive layer is electrically connected to a first lead configuring to input voltage and a second lead configuring to output voltage. The resistance of the piezo-resistive layer is able to be varied when under pressure, further caused change of the corresponding output voltage. The present invention also provides a method of detecting three-point touch pressure using the touch panel.

Description

Touch panel, electronic device and method for detecting three-touch

The invention relates to a touch panel capable of sensing touch pressure, an electronic device using the touch panel, and a method for performing three-point touch detection using the touch panel.

At present, electronic devices such as smart phones and tablet computers with touch display functions often use a pressure sensor to sense touch force to realize more functional features of the electronic device. Common pressure sensors include capacitive pressure sensors and resistive pressure sensors. The pressure sensor generally includes a pair of upper and lower electrodes and a dielectric layer between the upper and lower electrodes. When a touch pressing operation occurs, a capacitance value or a resistance value between the upper and lower electrodes changes. The magnitude of the touch pressing force is converted by the amount of change in the capacitance value or the resistance value. However, the structure of the pressure sensor is relatively complicated, and for multi-touch, it is difficult to separately detect the touch pressure of each touch point.

In view of this, it is necessary to provide a touch panel that facilitates structural simplification and an electronic device using the touch panel.

A touch panel defines a touch area and a routing area surrounding the touch area, the touch panel includes a cover and a touch sensing structure, and the cover has a first surface and a second surface opposite to each other The touch sensing structure is located on the second surface, and the second surface is provided with a piezoresistive layer at least one position corresponding to the area of the wiring area, and each of the piezoresistive layers is respectively associated with a first lead and a first The two lead electrical connection, the first lead input voltage, the second lead output voltage, the resistive layer changes in resistivity when subjected to stress, thereby causing a corresponding change in the output voltage of the second lead.

In an embodiment of the invention, the second surface is provided with an ink layer corresponding to the wiring region, and the piezoresistive layer is formed by embedding a plurality of piezoresistive particles in the ink layer.

In an embodiment of the invention, the second surface is provided with an ink layer corresponding to the wiring region, and the ink layer is disposed between the piezoresistive layer and the cover.

In an embodiment of the invention, the piezoresistive layer is disposed at each of the four corners of the second surface.

In an embodiment of the invention, the method further includes a reading module and a data processing module, wherein the reading module reads an output voltage of the second lead and a coordinate value of the touch pressing point, and the data processing module is configured to: Processing the data read by the reading module. An electronic device further includes a display panel, wherein the display panel is coupled to the touch sensing structure of the touch panel away from a surface of the cover. The electronic device uses the above touch panel.

A method for detecting a three-touch using a touch panel, the touch panel having a touch area and a routing area surrounding the touch area, the touch panel includes a cover and a touch sensing structure, the cover The first and second surfaces of the second and second surfaces of the second surface are respectively provided with a piezoresistive layer, wherein the four piezoresistive layers are respectively The four first leads input the same voltage, and the four piezoresistive layers respectively output voltages by the four second leads. When the piezoresistive layer is subjected to stress, the resistivity changes, causing the output voltage of the second lead to be corresponding. The touch panel further includes a reading module and a data processing module, wherein the data processing module is configured to process the data read by the reading module, and the method includes:

The reading module reads the output voltage of the four piezoresistive layer, and converts the touch of the four piezoresistive layer by performing three-point touch by using the data processing module. Pressing force size W ₁ , W ₂ , W ₃ , W ₄ ;

The data processing module calculates a vector coordinate of the sum of the touch pressures of the three points touched by the touch and the sum of the pressing forces of the three points according to the touch pressing force received by each of the piezoresistive layers (X , Y);

The reading module reads the coordinate values (X _a , Y _a ), (X _b , Y _b ), (Xc, Y _c ) of the three points pressed by the touch;

The data processing module converts the touch pressing force levels Wa, W _b , W _c at three points pressed by the touch.

Compared with the prior art, the pressure sensor of the present invention comprises a piezoresistive layer, a first lead and a second lead, the first lead inputs a voltage to the piezoresistive layer, the second lead input voltage, the piezoresistive layer When subjected to stress, the resistivity changes, causing a corresponding change in the output voltage of the second lead to convert the magnitude of the touch pressing force according to the amount of change in the output voltage. The pressure sensor of the present invention has a simple structure and is advantageous in reducing structural cost.

1 is a plan view of an electronic device according to a first embodiment of the present invention.

Figure 2 is a cross-sectional view taken along line II-II of Figure 1.

3 is a plan view of an electronic device according to a second embodiment of the present invention.

Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3.

FIG. 5 is a flow chart of a method for detecting the touch pressure of each point when using the touch panel of the present invention to detect three-point touch.

FIG. 6 is a structural block diagram of a functional module of a touch panel according to an embodiment of the invention.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 simultaneously, the electronic device 10 of the first embodiment may be a mobile phone, a computer, a game machine, a television, or the like. This embodiment will be described by taking a mobile phone as an example. The electronic device 10 includes a touch panel 100 and a display panel 200 and a frame 300. The frame 300 is disposed around the touch panel 100 and the display panel 200 to fix the two. The touch panel 100 defines a touch area 101 and a routing area 102 surrounding the touch area 101.

The touch panel 100 further includes a cover 110, a touch sensing structure 140, a reading module 400, and a data processing module 500 (see FIG. 6). The touch sensing structure 140 is located between the cover 110 and the display panel 200 . The reading module 400 and the data processing module 500 are communicatively coupled to each other. The data processing module 500 is configured to perform analytical calculation on the data read by the reading module 400 to obtain a desired result. The reading module 400 and the data processing module 500 may be a hardware module or a software module integrated on the control IC in the electronic device 10, or may be a hardware module separately disposed in the electronic device 10. The touch panel 100 is configured to implement a touch function of the electronic device 10 , for example, sensing touch location information to output a corresponding touch command. The display panel 200 is disposed below the touch panel 100 for implementing a screen display function.

The touch panel 100 can be, but not limited to, a One Glass Solution (OGS) touch panel 100, a single film (Glass-Film, GF) touch panel 100, or a dual film type (Glass-Film- Film, GFF) Touch panel 100. It can be understood that the touch function of the touch panel 100 can be integrated into the display panel 200 to form an in-cell touch display panel without additionally providing the touch panel 100. The display panel 200 is an organic light emitting display (OLED) or a liquid crystal display (LCD).

The cover plate 110 protects the entire electronic device 10. In the embodiment, the frame 300 carries the cover plate 110. The cover plate 110 can be fixed to the frame 300 by tape, for example. The cover 110 has a first surface 111 and a second surface 112 opposite to the first surface 111 . The first surface 111 serves as a touch operation interface, and the touch sensing structure 140 is located on the second surface 112 . The second surface 112 has two opposite first sides 1121 and two opposite second sides 1122 , and the two second sides 1122 are connected between the two first sides 1121 . In this embodiment, the first side 1121 is shorter than the length of the second side 1122. The touch sensing structure 140 further includes a sensing electrode and a signal line (not shown), the sensing electrode is disposed corresponding to the touch area 101, and the signal line is disposed corresponding to the routing area 102, and the signal line is The sensing electrode is connected to transmit the touch signal sensed by the sensing electrode to an external circuit (such as the above control IC).

Further, the cover 110 is larger than the touch sensing structure 140 and the display panel 200 , so that the periphery of the cover 110 protrudes beyond the touch sensing structure 140 and the display panel 200 . The second surface 112 is formed with an ink layer 120 corresponding to the area of the wiring area 102. The ink layer 120 can shield the route provided in the routing area 102 to beautify the appearance of the electronic device 10. In the present embodiment, the ink layer 120 is preferably a black ink.

The ink layer 120 covers the area of the second surface 112 corresponding to the routing area 102. In this embodiment, the cover plate 110 is substantially rectangular and defines four corners. A plurality of piezoresistive particles 134 are respectively embedded in the ink layer 120 at the four corners of the cover plate 110, thereby correspondingly forming four piezoresistive layers 131. The piezoresistive particles 134 are piezoresistive materials that change in electrical resistivity when subjected to stress. Each of the piezoresistive layers 131 is electrically connected to a first lead 132 and a second lead 133. Each of the piezoresistive layers 131 and the first lead 132 and the second lead 133 connected thereto form a pressure sensor 130, so that the electronic device 10 has four of the pressure sensors 130. They are located at four corners of the cover plate 110, respectively. In this embodiment, each of the pressure sensors 130 is located between the cover 110 and the touch sensing structure 140 and adjacent to the frame 300 .

For convenience of description, the four pressure sensors 130 are defined as a first pressure sensor 130a, a second pressure sensor 130b, a third pressure sensor 130c, and a fourth pressure sensor 130d, respectively. The first pressure sensor 130a, the second pressure sensor 130b, the third pressure sensor 130c, and the fourth pressure sensor 130d are arranged counterclockwise, and the first pressure sensor 130a The second pressure sensor 130b and the fourth pressure sensor 130d are respectively located at the other side of the second side 1122. Both ends. In the direction of the first side 1121, the distance between two adjacent pressure sensors 130 is L ₁ , and in the direction of the second side 1122, two adjacent pressure sensors 130 are adjacent. The distance between them is L ₂ . The distances L ₁ and L ₂ are both stored in the data processing module 500 in advance. It can be understood that the distances L ₁ and L ₂ indicated in FIG. 1 only roughly show the distance between two adjacent pressure sensors 130, and the two adjacent pressure sensors in the actual product. The distance between 130 is not necessarily exactly as shown in Figure 1.

As shown in FIG. 1, all of the first leads 132 of the four pressure sensors 130 are connected to the same input port, and the second leads 133 of the four pressure sensors 130 are respectively connected to different ones. The output is 埠. The first lead 132 inputs a voltage V _in , and the second lead 133 outputs a voltage V _out to the reading module 400 . When the touch control is performed on the electronic device 10, the resistivity of each of the piezoresistive layers 131 is changed, so that the output voltages V _out1 and V of the second leads 133 corresponding to the piezoresistive layers 131 _{OUT2 of the,} corresponding changes V _out3, V _out4 occurs, according to the output voltage _{V out1, V out2, V out3} , in terms of the amount of change V _out4 the pressing force of the touch size.

When the electronic device 10 is used to perform a touch action of a specific scene, such as playing a game, multi-touch, for example, three-touch, is usually required. As shown in FIG. 1, FIG. 1 shows an example of three-point touch. For convenience of description, the first pressure sensor 130a, the second pressure sensor 130b, the third pressure sensor 130c, and the fourth pressure sensor 130d are respectively subjected to a pressing force of W _{1 .} , W ₂ , W ₃ , W ₄ . The extending direction of the first side 1121 is the Y axis, and the extending direction of the second side 1122 is the X axis, and the pressing pressures of the three points subjected to the touch pressing are defined as W _a , W _{b .} The coordinates of W _c and the three points are (X _a , Y _a ), (X _b , Y _b ), (X _c , Y _c ), respectively. The vector of the sum of the pressing forces of the three points is D and the sum of the pressing forces of the three points is (X, Y).

When the operator performs the touch control on the three points simultaneously, the reading module 400 reads the output voltages of the four pressure sensors 130, and obtains the pressure sensors by converting the data processing module 500. The pressing force magnitudes W ₁ , W ₂ , W ₃ , and W ₄ received by the three-point touch. At the same time, the reading module 400 synchronously reads the coordinate values (X _a , Y _a ), (X _b , Y _b ), (X _c , Y _c ) of the three points pressed by the touch, and outputs the data to the data processing. Module 500. The data processing module 500 reads the data read by the reading module 400 (including the output voltage of the four pressure sensors 130 and the coordinate values of the three points pressed by the touch) and the distance stored in advance therein. The values of L1 and L2 are converted, and finally the touch pressing force amounts W _a , W _b , W _c received at the respective points when the three-point touch is simultaneously applied are obtained.

Wherein, when the data processing module 500 performs data analysis processing, the relationship used includes, but is not limited to, the following relationship:

.

Referring to FIG. 3 and FIG. 4 simultaneously, the electronic device 10 of the second embodiment may be a mobile phone, a computer, a game machine, a television, or the like. This embodiment will be described by taking a mobile phone as an example. It should be noted that, for convenience of explanation, each component symbol in the present embodiment follows the component symbol of the above-described first embodiment. The electronic device 10 includes a touch panel 100 and a display panel 200 and a frame 300. The frame 300 is disposed around the touch panel 100 and the display panel 200 for fixing. The touch panel 100 defines a touch area 101 and a routing area 102 surrounding the touch area 101.

The touch panel 100 further includes a cover 110, a touch sensing structure 140, a reading module 400, and a data processing module 500 (see FIG. 6). The touch sensing structure 140 is located between the cover 110 and the display panel 200 . The reading module 400 and the data processing module 500 are communicatively coupled to each other. The data processing module 500 is configured to perform analytical calculation on the data read by the reading module 400 to obtain a desired result. The reading module 400 and the data processing module 500 may be a hardware module or a software module integrated on the control IC in the electronic device 10, or may be a hardware module separately disposed in the electronic device 10. The touch panel 100 is configured to implement a touch function of the electronic device 10 , for example, sensing touch location information to output a corresponding touch command. The display panel 200 is disposed below the touch panel 100 for implementing a screen display function.

The touch panel 100 can be, but not limited to, a One Glass Solution (OGS) touch panel 100, a single film (Glass-Film, GF) touch panel 100, or a dual film type (Glass-Film- Film, GFF) Touch panel 100. It can be understood that the touch function of the touch panel 100 can be integrated into the display panel 200 to form an in-cell touch display panel without additionally providing the touch panel 100. The display panel 200 is an organic light emitting display (OLED) or a liquid crystal display (LCD).

The cover plate 110 protects the entire electronic device 10. In the embodiment, the frame 300 carries the cover plate 110. The cover plate 110 can be fixed to the frame 300 by tape, for example. The cover 110 has a first surface 111 and a second surface 112 opposite to the first surface 111 . The first surface 111 serves as a touch operation interface, and the touch sensing structure 140 is located on the second surface 112 . The second surface 112 has two opposite first sides 1121 and two opposite second sides 1122 , and the two second sides 1122 are connected between the two first sides 1121 . In this embodiment, the first side 1121 is shorter than the length of the second side 1122. The touch sensing structure 140 further includes a sensing electrode and a signal line (not shown), the sensing electrode is disposed corresponding to the touch area 101, and the signal line is disposed corresponding to the routing area 102, and the signal line is The sensing electrode is connected to transmit the touch signal sensed by the sensing electrode to an external circuit (such as the above control IC).

Further, the cover 110 is larger than the touch sensing structure 140 and the display panel 200 , so that the periphery of the cover 110 protrudes beyond the touch sensing structure 140 and the display panel 200 . The second surface 112 is formed with an ink layer 120 corresponding to the area of the wiring area 102. The ink layer 120 can shield the route provided in the routing area 102 to beautify the appearance of the electronic device 10. The ink layer 120 is black, white, colored or other suitable color. In the present embodiment, the ink layer 120 is white.

The ink layer 120 covers the area of the second surface 112 corresponding to the routing area 102. In this embodiment, the cover 110 is substantially rectangular and defines four corners. A pressure resist layer 131 is formed on the ink layer 120 at the four corners of the cover plate 110, and each of the ink layers 120 is located between the cover plate 110 and the piezoresistive layer 131. The piezoresistive layer 131 is a piezoresistive material that changes in electrical resistivity when subjected to stress. Each of the piezoresistive layers 131 is electrically connected to a first lead 132 and a second lead 133. Each of the piezoresistive layers 131 and the first lead 132 and the second lead 133 connected thereto form a pressure sensor 130, so that the electronic device 10 has four of the pressure sensors 130. They are located at four corners of the cover plate 110, respectively. In the present embodiment, the vector coordinate of the sum of the pressing forces of the three points and the sum of the pressing forces of the three points is (X, Y).

For convenience of description, the four pressure sensors 130 are defined as a first pressure sensor 130a, a second pressure sensor 130b, a third pressure sensor 130c, and a fourth pressure sensor 130d, respectively. The first pressure sensor 130a, the second pressure sensor 130b, the third pressure sensor 130c, and the fourth pressure sensor 130d are arranged counterclockwise, and the first pressure sensor 130a The second pressure sensor 130b and the fourth pressure sensor 130d are respectively located at the other side of the second side 1122. Both ends. Along the first side 1121, a distance between two adjacent pressure sensors 130 is L ₁ , along the second side 1122, between two adjacent pressure sensors 130 The distance is L ₂ . The distances L ₁ and L ₂ are both stored in the data processing module 500 in advance. It can be understood that the distances L ₁ and L ₂ indicated in FIG. 3 only roughly show the distance between two adjacent pressure sensors 130, and the two adjacent pressure sensors in the actual product. The distance between 130 is not necessarily exactly as shown in Figure 3.

All of the first leads 132 of the four pressure sensors 130 are connected to the same input port, and the second leads 133 of the four pressure sensors 130 are respectively connected to different output ports. The first lead 132 inputs a voltage V _in , the second lead 133 outputs a voltage V _out , and the second lead 133 outputs a voltage V _out to the reading module 400 . When the touch control is performed on the electronic device 10, the resistivity of each of the piezoresistive layers 131 is changed, so that the output voltages V _out1 and V of the second leads 133 corresponding to the piezoresistive layers 131 _{OUT2 of the,} corresponding changes V _out3, V _out4 occurs, according to the output voltage _{V out1, V out2, V out3} , in terms of the amount of change V _out4 the pressing force of the touch size. When the electronic device 10 is used to perform a touch action of a specific scene, such as playing a game, multi-touch, for example, three-touch, is usually required. As shown in FIG. 3, FIG. 3 shows an example of three-point touch. For convenience of description, the first pressure sensor 130a, the second pressure sensor 130b, the third pressure sensor 130c, and the fourth pressure sensor 130d are respectively subjected to a pressing force of W _{1 .} , W ₂ , W ₃ , W ₄ . The extending direction of the first side 1121 is the Y axis, and the extending direction of the second side 1122 is the X axis, and the pressing pressures of the three points subjected to the touch pressing are defined as W _a , W _{b .} The coordinates of W _c and the three points are (X _a , Y _a ), (X _b , Y _b ), (X _c , Y _c ), respectively. The vector of the sum of the pressing forces of the three points is D and the sum of the pressing forces of the three points is (X, Y).

When the operator performs the touch control on the three points simultaneously, the reading module 400 reads the output voltages of the four pressure sensors 130, and obtains the pressure sensors by converting the data processing module 500. The pressing force magnitudes W ₁ , W ₂ , W ₃ , and W ₄ received by the three-point touch. At the same time, the reading module 400 synchronously reads the coordinate values (X _a , Y _a ), (X _b , Y _b ), (X _c , Y _c ) of the three points pressed by the touch, and outputs the data to the data processing. Module 500. The data processing module 500 is pre-stored in the data processing module 500 according to the data read by the reading module 400 (including the output voltage of the four pressure sensors 130 and the coordinate values of the three points pressed by the touch). The values of the distances L ₁ and L ₂ are converted, and finally the touch pressing force amounts W _a , W _b , W _c received at the respective points when the three-point touch is simultaneously applied are obtained.

Wherein, when the data processing module 500 performs data analysis processing, the relationship used includes, but is not limited to, the following relationship:

.

Referring to FIG. 5 and FIG. 6 , the method steps of calculating the touch pressure of each point when the electronic device 10 is touched by three points in the above embodiments are further described below.

In step 501, when the three-touch operation is performed, the output voltages of the four pressure sensors 130 are read to convert the touch pressure received by each of the pressure sensors 130 due to the implementation of the three-point touch. Sizes W ₁ , W ₂ , W ₃ , W ₄ .

Specifically, the reading module 400 reads the output voltages of the four pressure sensors 130, wherein the first pressure sensor 130a, the second pressure sensor 130b, and the third pressure sensing The output voltages corresponding to the fourth pressure sensor 130d are respectively V _out1 , V _out2 , V _out3 , V _out4 , and the data processing module 500 respectively outputs output voltages V _out1 according to the four pressure sensors 130 . V _out2 , V _out3 , and V _{out4 are} converted according to the first pressure sensor 130a, the second pressure sensor 130b, the third pressure sensor 130c, and the fourth pressure sensor 130d. Pressure magnitudes W ₁ , W ₂ , W ₃ , W ₄ .

Step 502: Calculate the sum D of the touch pressures of the three points touched by the touch and the coordinates (X, Y) according to the touch pressure received by each of the pressure sensors 130. The conversion relationship is as follows:

.

Specifically, the data processing module 500 receives the pressing force according to the first pressure sensor 130a, the second pressure sensor 130b, the third pressure sensor 130c, and the fourth pressure sensor 130d. W ₁ , W ₂ , W ₃ , W ₄ and the values of the distances L ₁ and L ₂ stored in advance are converted to obtain the sum of the touch pressures of the three points subjected to the touch pressing and the coordinates D ( X, Y).

Step 503, the reading module 400 reads the coordinate values (X _a , Y _a ), (X _b , Y _b ), (X _c , Y _c ) of the three points pressed by the touch.

In step 504, the data processing module 500 converts the touch pressing pressures W _a , W _b , and W _c at three points of the touch pressing according to the data obtained in steps 501 to 503 , and the conversion relationship is as follows:

.

In summary, the creation meets the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be equivalently modified or changed according to the spirit of the present invention. It should be covered by the following patent application.

10‧‧‧Electronic devices

130c‧‧‧ third pressure sensor

100‧‧‧ touch panel

130d‧‧‧fourth pressure sensor

101‧‧‧ touch area

131‧‧‧ piezoresistive layer

102‧‧‧Drop area

132‧‧‧First lead

110‧‧‧ cover

133‧‧‧second lead

111‧‧‧ first surface

134‧‧‧ piezoresistive particles

112‧‧‧ second surface

140‧‧‧Touch sensing structure

1121‧‧‧ first side

200‧‧‧ display panel

1122‧‧‧ second side

300‧‧‧ frame

120‧‧‧Ink layer

400‧‧‧Read module

130‧‧‧pressure sensor

500‧‧‧Data Processing Module

130a‧‧‧First pressure sensor

L ₁ , L ₂ ‧‧‧ distance

Second pressure sensor: 130b

no

10‧‧‧Electronic devices

101‧‧‧ touch area

102‧‧‧Drop area

110‧‧‧ cover

111‧‧‧ first surface

1121‧‧‧ first side

1122‧‧‧ second side

130a‧‧‧First pressure sensor

130b‧‧‧Second pressure sensor

130c‧‧‧ third pressure sensor

130d‧‧‧fourth pressure sensor

132‧‧‧First lead

133‧‧‧second lead

L ₁ , L ₂ ‧‧‧ distance

Claims (11)

A touch panel defines a touch area and a wiring area surrounding the touch area, wherein the touch panel includes a cover and a touch sensing structure, the cover has a first surface opposite to the first surface a second surface, the touch sensing structure is located on the second surface, the second surface is provided with a piezoresistive layer at least one position of the area corresponding to the wiring area, and each of the piezoresistive layers and a first lead and a second lead is electrically connected, the first lead input voltage, the second lead output voltage, the resistive layer changes in resistivity when subjected to stress, thereby causing a corresponding change in the output voltage of the second lead; The control panel further includes a reading module and a data processing module, the reading module is electrically connected to the second lead to read an output voltage of the second lead and a coordinate value of the touch pressing point, and the data processing module is electrically The connection module is used to process the data read by the reading module. The touch panel of claim 1, wherein the second surface is provided with an ink layer corresponding to the wiring region, and the piezoresistive layer is formed by embedding a plurality of piezoresistive particles in the ink layer. The touch panel of claim 1, wherein the second surface is provided with an ink layer corresponding to the wiring area, and the ink layer is disposed between the piezoresistive layer and the cover. The touch panel of claim 1, wherein the piezoresistive layer is disposed at each of four corners of the region of the second surface. The touch panel of claim 4, wherein the second surface has two opposite first sides and two opposite second sides, and the second sides are connected to the second Between the two sides, the second surface is respectively provided with a piezoresistive layer corresponding to the four corners of the wiring area, and each of the piezoresistive layer and the first lead connected to the piezoresistive layer and The second leads connected correspondingly to the piezoresistive layer collectively constitute a pressure sensor, and the four pressure sensors disposed at four corners of the wiring area of the second surface are respectively defined as the first a pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, the first pressure sensor, the second pressure sensor, the third pressure sensor, and The fourth pressure sensor is arranged counterclockwise. The touch panel of claim 5, wherein the first pressure sensor and the second pressure sensor are respectively located at two ends of a second side, the third pressure sensor and the fourth The pressure sensors are respectively located at two ends of the other second side, and along the first side direction, the distance between the adjacent two of the pressure sensors is L ₁ along the second side direction The distance between the two adjacent pressure sensors is L ₂ , and the distances L ₁ and L ₂ are both stored in the data processing module in advance. The electronic device of the touch panel of any one of claims 1 to 6, further comprising a display panel, wherein the display panel is coupled to the surface of the touch sensing structure away from the cover. A method for detecting a three-touch using a touch panel, the touch panel having a touch area and a routing area surrounding the touch area, the touch panel includes a cover and a touch sensing structure, the cover The first and second surfaces of the second and second surfaces of the second surface are respectively provided with a piezoresistive layer, wherein the four piezoresistive layers are respectively The four first leads input the same voltage, and the four piezoresistive layers respectively output voltages by the four second leads. When the piezoresistive layer is subjected to stress, the resistivity changes, causing the output voltage of the second lead to be corresponding. The touch panel further includes a reading module and a data processing module, wherein the data processing module is configured to process the data read by the reading module, wherein the method comprises:
The reading module reads the output voltage of the four piezoresistive layer, and converts the touch of the four piezoresistive layer by performing three-point touch by using the data processing module. Pressing force size W ₁ , W ₂ , W ₃ , W ₄ ;
The data processing module calculates a vector coordinate of the sum of the touch pressures of the three points touched by the touch and the sum of the pressing forces of the three points according to the touch pressing force received by each of the piezoresistive layers (X , Y);
The reading module reads the coordinate values (Xa, Ya), (Xb, Yb), (Xc, Yc) of the three points pressed by the touch;
The data processing module converts the touch pressing force levels Wa, Wb, and Wc at three points pressed by the touch. The method for detecting the touch pressure of each point when the three-touch is performed according to claim 8, wherein each of the piezoresistive layers and the adjacent two are pre-processed before performing the three-touch operation. The distance values L ₁ , L ₂ between the piezoresistive layers are stored in the data processing module. The method for detecting the touch pressure of each point when three-touch is performed according to claim 9, wherein the sum of the touch pressures of the three points pressed by the touch is calculated and the three points are received. The conversion relationship of the vector coordinate (X, Y) of the sum of the pressures is as follows:
. The method of claim 3, wherein the data processing module converts the touch pressure of the three points at the three points of the touch control by a pressure amount W _a , W _b , W _c , the conversion relationship is as follows:
.