CN115599238A - Display panel and touch method thereof - Google Patents

Abstract

The application discloses a display panel and a touch method thereof, wherein the display panel comprises a substrate, a touch layer and a processing circuit; the touch layer is positioned on the substrate and comprises a plurality of strain sensors distributed in an array manner; the processing circuit is electrically connected with the plurality of strain sensors and used for determining touch point positions based on actual electric signals of each strain sensor. The display panel provided by the application can realize real-time accurate and quick acquisition of the touch signals through the combined use of the plurality of strain sensors and the processing circuit, and can make accurate response according to the touch signals.

Description

Display panel and touch method thereof

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display panel and a touch method thereof.

Background

At present, a capacitive touch technology is mostly adopted in a touch panel used with an OLED (Organic Light-Emitting display, organic Light-Emitting semiconductor) display panel, the technology needs to perform uninterrupted charging and discharging on a node capacitor array to detect the change of the capacitance value of each node, then the capacitance value change of a current frame caused by touch is obtained according to comparison between a collected current frame capacitance value data matrix (RawData) and a reference frame capacitance data matrix (BaseData), further a coordinate of touch occurrence is obtained and reported to an MCU micro control unit, and the MCU performs corresponding actions (clicking, sliding, and the like).

Generally, the distance between the touch sensor layer of the flexible folding screen and the cathode of the OLED is small, which results in a very large coupling capacitance between the touch electrode and the cathode of the OLED. As the size of the touch panel increases, the impedance and the self-capacitance of each touch electrode increase, and if the capacitive touch scheme is continuously used, the time required for detecting the capacitance of a single node is long, which may cause the touch report efficiency to decrease, and affect the touch experience of the consumer.

In addition, the increase of the coupling capacitance also causes the capacitive touch sensor to be more easily affected by environmental noise, resulting in low signal-to-noise ratio (SNR), and causes problems of point misreading, touch insensitivity and the like.

Disclosure of Invention

The application mainly provides a display panel and a touch method thereof, and through the design of strain sensors and a processing circuit which are positioned on a touch layer of the display panel, touch point positions can be determined according to actual electric signals of each strain sensor, so that the touch efficiency of the display panel is effectively improved by responding to the pressing of the display panel.

In order to solve the technical problem, the application adopts a technical scheme that: a display panel is provided, which comprises a substrate, a touch layer and a processing circuit; the touch layer is positioned on the substrate and comprises a plurality of strain sensors distributed in an array; the processing circuit is electrically connected with the plurality of strain sensors and used for determining touch point positions based on actual electric signals of each strain sensor.

Another technical solution adopted by the present application is a touch method of a display panel, including: acquiring an actual electric signal of each strain sensor on the display panel through collection; and determining touch point positions based on the actual electric signals of each strain sensor.

The beneficial effect of this application is: different from the prior art, in the present application, by using a strain sensor in the touch layer, when the display panel is pressed, a certain strain is generated in the corresponding strain sensor area. Then, the strain sensor is connected with the processing circuit, and the processing circuit processes signals generated by the strain sensor, so that touch point positions can be determined. Through the application of the strain sensor and the processing circuit, the touch point position can be effectively and timely determined, the feedback is timely made to operations such as pressing, the touch efficiency is improved, and the use experience of a user is improved. Simultaneously through the application of strain sensor avoided using the electric capacity when touching-control among the prior art through the electric capacity charge-discharge of electric capacity to detect the touch-control position and the capacitive coupling problem that produces, this application has the advantage that the report rate is high and SNR is high.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. Wherein:

FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;

FIG. 2 is a schematic plan view illustrating a touch layer of a display panel according to an embodiment of the present disclosure;

FIG. 3 is an enlarged view of the present application taken in the area C of FIG. 2;

FIG. 4 is a schematic diagram of a display panel processing circuit according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a gate circuit unit according to an embodiment of the present application;

FIG. 6 is a schematic diagram of the structure of one embodiment of a bridge according to the present application;

FIG. 7 is a flowchart illustrating a touch method of a display panel according to an embodiment of the present disclosure;

FIG. 8 is a flowchart illustrating an embodiment corresponding to step S2 in FIG. 7 of the present application;

FIG. 9 is a diagram illustrating an embodiment corresponding to step S21 in FIG. 8;

fig. 10 is a flowchart illustrating an embodiment of obtaining the pressure level in step S22 of fig. 8.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be obtained by a person skilled in the art without making creative efforts based on the embodiments in the present application belong to the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a display panel according to the present application. The display panel 100 includes a substrate (not shown), a touch layer 1 and a processing circuit 2, wherein the touch layer 1 is disposed on the substrate and includes a plurality of strain sensors 10 distributed in an array; the processing circuit 2 is electrically connected to the plurality of strain sensors 10 for determining touch location based on the actual electrical signal of each strain sensor 10. The display panel 100 has a display area 103 and a non-display area 104, wherein the strain sensor 10 is located in the display area 103 and the processing circuit 2 is located in the non-display area 104. In other embodiments, the processing circuit 2 may be disposed on a side of the substrate away from the touch layer 1 through a bending process or a substrate layer opening process, in which case an orthogonal projection of the processing circuit 2 on the substrate may partially coincide with an orthogonal projection of the display area 103 on the substrate. By using the strain sensor 10 in the touch layer 1, when the display panel 100 is pressed, a certain strain is generated in the corresponding strain sensor 10 region. Then, the strain sensor 10 is connected to the processing circuit 2, and the processing circuit 2 processes the electrical signal generated by the strain sensor 10 to determine the touch point position. Through the application of the strain sensor 10 and the processing circuit 2, the touch point position can be effectively and timely determined, and the feedback can be timely made to operations such as pressing, so that the touch efficiency is improved, and the use experience of a user is improved. Meanwhile, the application of the strain sensor 10 avoids the capacitive coupling problem caused by the fact that the touch point position is detected through the charging and discharging of the capacitor when the capacitor is used for touch control in the prior art, and the strain sensor has the advantages of high point reporting rate and high signal-to-noise ratio (SNR).

When the strain sensor 10 is used as the touch layer 1, the touch layer 1 may be placed at a plurality of positions in the display panel 100, and for the display panel 100 adopting a flexible cover plate, the touch layer 1 and the cover plate layer are stacked, and the touch layer 1 may be stacked on a thin flexible cover plate to form a plug-in type; for the On-cell (the touch layer 1 may be disposed On the package layer of the display panel 100), the touch layer 1 may be disposed On the package layer TFE of the display panel 100, and for the In-cell (the touch layer 1 is disposed On the driving substrate of the display panel 100 and disposed On a different layer from the pixel driving circuit), the touch layer 1 may be disposed On the substrate layer of the display panel 100.

Referring to fig. 2 and 3, fig. 2 is a schematic plan view illustrating a touch layer of a display panel according to an embodiment of the present disclosure, and fig. 3 is an enlarged view of a region C in fig. 2. The touch layer 1 further includes a plurality of first metal traces 101 and a plurality of second metal traces 102; optionally, the first metal trace 101 and the plurality of second metal traces 102 may be made of conductive materials with the same material, or made of conductive materials with different materials.

The strain sensors 10 are arranged in multiple rows along a first direction X, and the strain sensors 10 located in the same row are arranged at intervals along a second direction Y; each strain sensor 10 comprises a first end a and a second end B, the first ends a of the plurality of strain sensors 10 located in the same column are electrically connected with the processing circuit 2 through the same first metal wire 101, and the second ends B of the plurality of strain sensors 10 located in the same column are electrically connected with the processing circuit 2 through the corresponding second metal wires 102 respectively; the first metal trace 101 is communicated with the first end a of the strain sensor 10, and the second metal trace 102 is communicated with the second end B of the strain sensor 10, that is, the signal of the strain sensor 10 is derived through the metal trace.

Preferably, the first direction X and the second direction Y are perpendicular. When first direction X and second direction Y are perpendicular, because a plurality of strain sensor 10 arrange into the multiseriate along first direction X, lie in a plurality of strain sensor 10 of same row and arrange along second direction Y interval, a plurality of strain sensor 10 are the array at touch-control layer 1 this moment and arrange, do benefit to and detect the strain of display area.

Preferably, the first metal trace 101 and the second metal trace 102 are disposed on the same layer, and the strain sensor 10 is disposed on a different layer from the first metal trace 101. The first metal wire 101 and the second metal wire 102 form a metal wire, the first metal wire and the second metal wire can be arranged on the same layer, the strain sensor 10 and the metal wire are arranged on different layers, the strain sensor 10 and the metal wire respectively belong to different plane layers at the moment, an insulating layer is arranged between the strain sensor 10 and the metal wire, and the metal wire is connected with the strain sensor 10 through punching on the insulating layer. Therefore, gaps among the strain sensors 10 can be reduced, meanwhile, the space required by the metal lead wires arranged on the side edges of the strain sensors 10 on the same layer can be eliminated, the arrangement density of the strain sensors 10 is increased, touch blind areas are eliminated, touch precision is improved, touch performance is improved, meanwhile, the frame of the display panel 100 can be reduced, and the strain sensors 10 and metal wiring can be arranged in the display panel 100 designed by adopting a narrow frame.

In another embodiment, a design that the metal trace and the strain sensor 10 are disposed in the same layer may also be adopted, the metal trace is disposed on the side surface of the strain sensor 10, and is communicated with the first end a of the strain sensor 10 through the first metal trace 101, and the second metal trace 102 is communicated with the second end B of the strain sensor 10, so as to lead out the signal and communicate with the processing circuit 2.

With continued reference to fig. 3, the orthographic projection of the strain sensor 10 on the substrate is S-shaped; the strain sensor 10 may be a resistance-type strain sensor, each strain sensor 10 includes a first end a and a second end B, preferably, the resistance-type strain sensor may be a strain resistance wire, and the strain resistance wires are arranged in an S-shape along the second direction, and specifically, one strain resistance wire may be routed back and forth along the first direction X to form an S-shape. The starting point position of the distribution of the resistance wires of each strain sensor 10 is a first end A, and the end point position is a second end B. The strain sensor 10 is a resistance-type strain sensor which deforms under pressure and the resistance value of the resistance-type strain sensor changes accordingly. Therefore, when the resistance type strain sensor generates a detection signal according to the change of the resistance value, the touch point position information can be obtained according to the detection signal. The pressure is different in size, and resistance-type strain sensor's deformation volume is different to can improve the change volume of strain sensor resistance, improve the sensitivity to deformation detection.

Preferably, the material of the strain sensor comprises low-temperature polysilicon P-Si. The resolution and the stability of the P-Si are higher than those of other polysilicon, such as hydrogenated polysilicon A-Si, and the resistance type strain sensor made of the P-Si adopts an S-shaped design, so that the resistance type strain sensor has the characteristics of large resistance change range and large strain capacity formed under the same stress condition, is sensitive to pressure reaction, and is beneficial to acquiring an electric signal generated after subsequent pressing.

With reference to fig. 2 and fig. 3, orthographic projections of the first ends a of the plurality of strain sensors 10 located in the same column on the substrate are located on the same line; preferably, the extension direction of the straight line is parallel to the second direction Y; and/or orthographic projections of the second ends B of the plurality of strain sensors 10 positioned in the same column on the substrate are arranged along the first direction X in a staggered mode. As shown in fig. 2, m strain sensors 10 may be arranged in the first direction X, n strain sensors 10 may be arranged in the second direction Y, and at this time, m × n strain sensors 10 distributed in an array are arranged on the touch layer 1, where the first metal trace 101 is communicated with the first end a, and the second metal trace 102 is communicated with the second end B, and as can be seen from fig. 2, in the second direction Y, the first end a of each strain sensor 10 in the strain sensors 10 is on a straight line. Therefore, the first metal trace 101 may be connected to the first end a of each strain sensor 10 in turn, i.e. the first metal trace 101 is a common line. In the second direction Y, the second ends B of each of the strain sensors 10 in the strain sensors 10 are arranged in a staggered manner in the X direction, so that N second ends B are provided on a plurality of strain sensors 10 arranged in the same column in the second direction Y, and at this time, the second metal trace 102 is sequentially connected to the second ends B _1 to B _ N of the strain sensors 10. The second metal trace is not one, and has n pieces, that is, the number of the second metal traces 102 is the same as the number of the strain sensors in the same column of the strain sensors 11. The first metal traces 101 are connected to the first ends a of all the strain sensors 10 in the strain sensors 10, and the n second metal traces 102 are connected to the second ends B of all the strain sensors 10 in the same column of strain sensors 11, so that the same column of strain sensors 11 is connected to the processing circuit 2.

The display panel 100 further includes a light emitting layer between the touch layer 1 and the substrate; the light-emitting layer comprises a plurality of light-emitting units arranged at intervals; the orthographic projection of the strain sensor 10 on the substrate does not coincide with the orthographic projection of the light-emitting unit on the substrate. That is, the S-shaped P-si trace and the metal lead do not overlap with the orthographic projection of the light emitting unit on the substrate, and the arrangement of the S-shaped P-si trace and the metal lead does not affect the light emitting unit, so that the strain sensor 10 is disposed in the display area of the display panel 100 and does not affect the display effect. Of course, in other embodiments, when the materials of the strain sensor 10 and the metal leads are transparent, the orthographic projection of the strain sensor 10 on the substrate may at least partially coincide with the orthographic projection of the light-emitting unit on the substrate.

Each strain sensor 10 may generate a detection signal when subjected to a pressing force or the like perpendicular to the plane of the touch layer 1. Therefore, when the display panel 100 is pressed in a plane perpendicular to the first direction X and the second direction Y, the resistance of the strain sensor 10 changes, and it can be determined that the area where the pressing occurs is the area where the strain sensor 10 generating the detection signal is located among the plurality of strain sensors 10. For changes in resistance values, which are generally difficult to quantify and obtain directly, in one embodiment of the invention, the detection signal generated from the change in resistance values may be converted by a processing circuit 2 connected to the strain sensor to obtain a converted signal.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a display panel processing circuit according to the present application; the processing circuit 2 includes: a gate unit 20, an acquisition unit 30 and a processing unit 40. The gate circuit unit 20 is electrically connected with the plurality of second metal traces 102, and is used for receiving actual electrical signals output by the plurality of strain sensors 10 located in the same column in a time-sharing manner; the acquisition unit 30 is electrically connected with the first metal routing 101 and the gate circuit unit 20, and is used for acquiring and obtaining an actual electric signal of the corresponding strain sensor 10; the processing unit 40 is electrically connected to the acquisition unit 30, and is configured to determine a touch point location based on the actual electrical signal of each strain sensor 10.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of a gate circuit unit in the present application; the gate circuit unit 20 includes a control unit 21, a shift register circuit 22, and a plurality of transistors 23. The shift register circuit 22 is electrically connected with the control unit 21; one end of one transistor 23 is electrically connected with the shift register circuit 22, and the other end of one transistor 23 is electrically connected with one second metal wire 102; wherein, the control unit 21 controls the shift register circuit 22 to sequentially transmit a pulse signal to each transistor 23, so as to turn on the corresponding transistor 23; wherein only one transistor 23 is turned on at the same time; the control unit 21 can control the operation of the shift register circuit 22, and control the signal output by the shift register circuit 22 by outputting a start signal, a clock signal and a reset signal, wherein the single pulse signal output by the shift register circuit 22 can be effectively transmitted to the gate of the transistor 23, so as to control the on/off of the pipeline where the transistor 23 is located, thereby implementing time division multiplexing of the strain sensor 10.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a bridge according to the present application; the acquisition unit 30 includes a bridge 31, an amplification circuit 32 and an analog-to-digital conversion circuit 33. Wherein the bridge 31 is connected to the gate unit 20, the first metal trace 101 and the second metal trace 102; the first end a and the second end B of the strain sensor 10 are connected to the bridge 31 via a first metal track 101 and a second metal track 102. The amplifying circuit 32 is electrically connected to the bridge 31, and is configured to amplify the signal output by the bridge 31; the analog-to-digital conversion circuit 33 is electrically connected to the amplification circuit 32, and converts the signal supplied from the amplification circuit 32 to obtain an actual electrical signal of the strain sensor 10.

The bridge 31 comprises a first resistor R1, a second resistor R2, a third resistor R3 and a voltage detector Vout, in the connection relationship of the bridge 31, a first end A and a second end B of the strain sensor 10 are sequentially connected to the bridge 31, and the first end of the first resistor R1 is connected with the first end A of the strain sensor 10; the first end of the second resistor R2 is connected with the second end of the first resistor R1; a first end of the third resistor R3 is connected with a second end of the second resistor R2, and a second end of the third resistor R3 is connected with a second end B of the strain sensor 10; a first end of the voltage detector Vout is connected to the first end a of the strain sensor 10, a second end of the voltage detector Vout is connected to a first end of the third resistor R3, and an output end of the voltage detector Vout outputs a voltage signal. Meanwhile, a power supply is connected to the first end of the first resistor R1 and the second end of the second resistor R2, and the voltage of the power supply is Vin, so as to provide power for the operation of the bridge 31.

Wherein epsilon is the strain degree value of the strain sensor 10, and K is a constant corresponding to the strain sensor 10.

In the bridge 31, assuming that the resistances corresponding to the first resistor R1, the second resistor R2, and the third resistor R3 are R1, R2, and R3, respectively, the resistance when the strain sensor 10 is not deformed is Rs, the variation of the resistance when the strain sensor 10 is deformed is Δ Rs, and the voltage of the preset power supply is Vin, the voltage output by the voltage detector Vout can be calculated as the difference between the voltages of the first terminal a and the second terminal B of the strain sensor 10 according to the above circuit structure of the bridge 31, and since R1, R2, R3, rs, and Vin are all constant values, the voltage Vout output by the voltage detector Vout only depends on the variation of the resistance Δ Rs when the strain sensor 10 is deformed.

The signal of the change in resistance of the strain sensor 10 can be converted into a voltage signal by a wheatstone bridge as shown in fig. 6. In other embodiments, the signal of the change in resistance of the strain sensor 10 may be converted to a current signal by a wheatstone bridge as shown in fig. 6.

The converted current signal or voltage signal is typically very small, and therefore, as shown in fig. 4, an amplification circuit 32 connected to the bridge 31 may be provided to amplify the converted signal obtained by the bridge 31. In addition, since the processing unit 40 generally recognizes digital signals, as shown in fig. 4, an analog-to-digital conversion circuit 33 connected to the amplification circuit 32 may also be provided to perform AD conversion (analog-to-digital conversion) on the amplified converted signals. After the converted signal is obtained, the converted signal is generally recognized by the processing unit 40 or the like to finally determine the region where the deformation occurs. The processing unit 40 may be an MCU microprocessor, such as a single chip microcomputer or an Arm chip (Advanced RISC Machine).

It should be noted that, for each strain sensor 10, one gate unit 20 and one acquisition unit 30 may be correspondingly disposed, or, one gate unit 20 may be correspondingly disposed for each strain sensor 10, and a plurality of gate units 20 disposed corresponding to a plurality of strain sensors 10 are connected to one acquisition unit 30, that is, one acquisition unit 30 is shared by a plurality of strain sensors 10. The processing circuit 2 may be a chip IC, which may be placed in a non-display area of the display panel 100. Thus, the processing circuit 2 can determine the area of the display panel 100 where the deformation occurs according to the received electrical signal sent by the strain sensor 10, thereby facilitating further display control of the display panel 100 accordingly. As described above, according to the display panel 100 of the embodiment of the present invention, the strain sensor 10 and the processing circuit 2 are provided on the display panel, so that the region where the strain occurs can be detected easily and efficiently.

The display panel 100 of the embodiment of the present invention may further include a processing unit 40, wherein the processing unit 40 is connected to the collecting unit 30, and the processing unit 40 collects quantized data sent by the collecting unit 30 in a time-sharing manner into data frames; comparing data of the data frames after frame filtering (multi-frame averaging and background noise removal) with reference data to obtain a change value array of the electric signals of each pressed strain sensor 10; for determining the area of the display panel 100 where the deformation occurs from the electrical signal generated by the strain sensor 10, for determining the pixel coordinates from the area of the display panel 100 where the deformation occurs, and for determining the pressure level from the magnitude of the deformation in the detection signal. The processing unit 40 fits the variation values of the electrical signals of the strain sensors to the coordinates of the actual touch center, quantizes the variation values of the electrical signals to pressure levels, and outputs the pixel coordinates and the pressure levels to the outside. The processing circuit 2 may further include a response unit 50, and the response unit 50 may execute a corresponding action according to the touch point location and the pressure level information obtained by the processing unit 40, so as to implement touch control.

Referring to fig. 7, fig. 7 is a flowchart illustrating a touch method of a display panel according to an embodiment of the present disclosure; according to the display panel 100 comprising the strain sensor 10 and the processing circuit 2, the executable touch method comprises the following steps:

s1: acquiring an actual electric signal of each strain sensor 10 on the display panel 100;

the strain sensor 10 may be a resistive strain sensor. When a certain deformable area deforms, the corresponding resistance-type strain sensor deforms, and the resistance value of the resistance-type strain sensor can change accordingly. Therefore, when the resistance type strain sensor generates an electric signal according to the change of the resistance value, the deformation area which is correspondingly deformed can be obtained according to the electric signal. For the change in resistance value, it is generally difficult to directly quantify and obtain, and therefore, an electric signal generated according to the change in resistance value may be converted to obtain a converted signal. In an embodiment of the present invention, time division multiplexing of the acquisition unit 30 can be realized through the gate circuit unit 20, so as to improve the accuracy of the detection result. In the acquisition unit 30, the signal of the strain sensor 10 with a changed resistance value is converted into a current signal or a voltage signal by a wheatstone bridge shown in fig. 6. The converted current signal or voltage signal is generally very small, so that the amplifying circuit 32 amplifies the converted signal, the analog-to-digital converting circuit 33 performs analog-to-digital conversion on the converted signal, and the digital signal generated thereby is transmitted to the processing unit 40. The conversion signal is generally recognized by the processing unit 40 to finally determine the deformed area, i.e., the touch point location, and further, the processing unit 40 may determine the pressure level according to the magnitude of the conversion signal. Therefore, the processing circuit 2 can determine the area of the display panel 100 deformed and the pressure applied to the display panel according to the received digital signal, so as to facilitate the touch operation of the response unit 50.

S2: the touch location is determined or touched based on the actual electrical signal of each strain sensor.

The processing unit 40 determines the resistance-type strain sensor with the resistance value changing according to the digital signal output by the acquisition unit 30, so as to determine the area of deformation in the display panel 100. And determines pixel coordinates according to the area where the deformation occurs in the display panel 100 and determines a pressure level according to the magnitude of the deformation in the detection signal.

Referring to fig. 8, fig. 8 is a schematic flowchart illustrating an embodiment corresponding to step S2 in fig. 7 of the present application; the specific implementation process of the step S2 may include:

s21: the difference amount of the actual electric signal from the preset electric signal is determined based on the actual electric signal of each strain sensor 10, and the touch area and the touch center coordinates of the touch area are obtained based on at least one strain sensor 10 of which the difference amount is greater than the threshold value.

First, establishing a coordinate origin, taking an initial point where a display area of the display panel 100 crosses in a first direction X and a second direction Y as the coordinate origin (0, 0); of course, in other embodiments, the origin coordinates may be other positions, which is not limited in this application.

Then, the difference amount of the actual electric signal from the preset electric signal is determined based on the actual electric signal of each strain sensor 10, and based on at least one strain sensor with the difference amount larger than the threshold, all the strain sensors with the difference amount larger than the threshold constitute a touch area.

Further, the process of obtaining the touch center coordinates of the touch area may be: A. obtaining a first coordinate (x) of a first strain sensor having a greatest amount of variance in the touch area ₀ ,y ₀ ) (ii) a Since the strain sensor is generally in a block shape, for convenience of calculation, the coordinates of the center point or the coordinates of a certain corner of the strain sensor may be subsequently used as the coordinates of the strain sensor. B. Obtaining a differential quantity of strain sensors adjacent to the first strain leaflet; C. and fitting to obtain a touch center coordinate based on the first coordinate, the difference of the first strain sensor and the difference of the strain sensor adjacent to the first strain sensor.

Optionally, the step of obtaining the touch center coordinate based on the first coordinate and the difference fitting includes: obtaining the touch center coordinates (X, Y) by fitting according to the following formula:

wherein x is ₀ Abscissa, y, representing a first coordinate ₀ An ordinate representing the first coordinate, a being the length of the first strain sensor in the first direction X, B being the width of the first strain sensor in the second direction Y, wherein a is the difference of the first strain sensor, B, c are the differences of two strain sensors 10 adjacent to the first strain sensor in the second direction Y, d, e are the differences of two strain sensors 10 adjacent to the first strain sensor in the first direction X. And (X, Y) calculated according to the formula is the touch center coordinate.

In an embodiment, please refer to fig. 9, fig. 9 is an exemplary diagram of an embodiment corresponding to step S21 in fig. 8 of the present application. Obtaining a first coordinate (x) of a first strain sensor having a largest amount of difference in a touch area ₀ ,y ₀ ) As shown in FIG. 9, at the coordinate (x) ₂ ,y ₃ ) The difference value of the first strain sensor is 800 at most, and at the moment, the value of a is 800, and the coordinate (x) ₂ ,y ₃ ) Is a first coordinate (x) ₀ ,y ₀ ). Then, difference quantities of four strain sensors 10 which are respectively adjacent to the first strain waybill up, down, left and right are obtained; the difference b of the strain sensors 10 located above the first strain sensor is 400, the difference c of the strain sensors 10 located below the first strain sensor is 400, the difference d of the strain sensors 10 located at the left side of the first strain sensor is 400, the difference e of the strain sensors 10 located at the right side of the first strain sensor is 400, and then based on the first coordinate (x) where x is ₂ ,y ₃ ) The difference a between the first strain sensors, and the differences b and c between the four strain sensors 10 adjacent to the first strain sensorsAnd d, fitting to obtain the touch center coordinates.

S22: and obtaining a pixel coordinate of the light-emitting unit corresponding to the touch center based on the touch center coordinate, wherein the pixel coordinate is the touch point position.

The step of obtaining the pixel coordinates of the light emitting unit corresponding to the touch center based on the touch center coordinates includes assuming that the length and width of a single pixel in the first direction X and the second direction Y are both e, where (X, Y) is the touch center coordinates of the touch area. Obtaining the pixel coordinates of the light emitting unit corresponding to the touch center by the following formula:

x＝int(X/e)

y＝int(Y/e)

then X = int (X/e) and Y = int (Y/e), the numerical values of X/e and Y/e can be converted into integers by int function operation, the obtained (X, Y) coordinates are pixel coordinates of the display panel 100 mapped by the change position of the electrical signal, and the pixel coordinates are touch point positions.

S23: and obtaining the pressure level of each strain sensor in the touch area based on the touch center coordinate and the difference of each strain sensor in the touch area.

Referring to fig. 10, fig. 10 is a schematic flowchart illustrating an embodiment of obtaining the pressure level in step S22 of fig. 8 according to the present application. The step of obtaining the pressure level of each strain sensor in the touch area based on the touch center coordinate and the difference between each strain sensor in the touch area in step S22 includes:

s231: and obtaining the touch type based on the relative position relation between the touch center coordinate and the strain sensor in the touch area.

Specifically, there are various relative position relationships between the touch center coordinate and the strain sensor in the touch area, for example, the touch center coordinate is located inside the strain sensor in the touch area, the touch center coordinate is located in the middle of two adjacent strain sensors in the touch area, or the touch center coordinate is located in the middle of four adjacent strain sensors in the touch area. Each different position relationship corresponds to a different touch type.

In step S231, the step of obtaining the touch type based on the relative position relationship between the touch center coordinate and the strain sensor in the touch area includes: determining the touch type to be a first touch type in response to the touch center coordinate being located inside the strain sensor in the touch area; or, in response to the touch center coordinate being located between two adjacent strain sensors in the touch area, determining the touch type as a second touch type; or, determining that the touch type is the third touch type in response to the fact that the touch center coordinate is located in the middle of four adjacent strain sensors in the touch area.

S232: and acquiring a target expansion coefficient corresponding to the current touch type according to a preset corresponding relation between the touch type and the expansion coefficient.

The number of the strain sensors 10 having the largest electrical signal variation value is different among different touch types. Therefore, when the variation of the electrical signal is converted into the pressure level, the corresponding expansion coefficients between the variation of the electrical signal and the pressure level are different in different touch types. The expansion coefficients can be obtained experimentally.

In the first touch type: referring to point D in fig. 2, the touch center coordinate is located inside the strain sensor in the touch area, that is, when only one of the strain sensors 10 has the largest electrical signal variation value, at this time, the electrical signal variation value of the strain sensor 10 and the stress applied by the strain sensor have a linear relationship.

In the second touch type: referring to point E in fig. 2, when the touch center coordinate is located between two adjacent strain sensors in the touch area, and the touch center coordinate of the strain sensor 10 is located between two adjacent strain sensors 10 in the first direction or the second direction, that is, when the electrical signal variation values of two strain sensors 10 are the maximum, the electrical signal variation value of the strain sensor 10 and the applied stress are in a linear relationship.

In a third touch type: referring to point F in fig. 2, the touch center coordinate is located in the middle of four adjacent strain sensors in the touch area, and when the touch center coordinate of the strain sensor 10 is located in the middle of the four adjacent strain sensors 10, that is, when there is the largest change value of the electrical signals of the four strain sensors 10 at the same time, the change value of the electrical signals of the strain sensors 10 and the stress applied to the strain sensors are in a linear relationship.

In the touch types, the expansion coefficient of the second touch type is smaller than that of the first touch type and larger than that of the third touch type. The pressure grade can be obtained by multiplying the electric signal change value of the strain sensor 10 by the corresponding expansion coefficient in a quantification manner; the processing circuit 2 performs corresponding action response for the touch point location information and the pressure level information. The touch point provides a pixel position for response, and the pressure level provides a basis for what kind of response is performed for touch control of the display panel 100. For example, in a design, the display panel may operate differently depending on the pressure level.

S233: and determining the pressure level based on the expansion coefficient and the difference quantity of each strain sensor in the touch area.

Specifically, the pressure level information can be obtained by multiplying the difference in the strain sensors 10 by the corresponding expansion coefficient and combining the difference of each strain sensor.

S24: and executing corresponding operation based on the pressure level and the touch point position.

According to the application, the touch point reporting and pressure detecting functions of the display panel 100 are further realized by detecting the external force and the touch position of the strain sensor 10 under the conditions of pressing and the like; and effectively obtain the pressure level and the touch point location information of the display panel 100, thereby implementing touch. The display panel 100 has the characteristics of high report rate and high SNR (Signal-Noise Ratio).

According to the display panel 100 provided by the application, by arranging the strain sensor 10 and the processing circuit 2, the processing circuit 2 can conveniently and effectively determine the area of deformation in the display panel 100 according to the change value of the electric signal output by the strain sensor 10, namely, the pixel coordinate of deformation in the display panel 100 is obtained, and the pressure grade is determined. The processing circuit 2 further executes corresponding operations according to the pixel coordinates and the pressure levels, thereby realizing touch control.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. A display panel, comprising:

a substrate;

the touch layer is positioned on the substrate and comprises a plurality of strain sensors distributed in an array;

and the processing circuit is electrically connected with the plurality of strain sensors and used for determining touch point positions based on the actual electric signals of each strain sensor.

2. The display panel of claim 1,

the touch layer further comprises a plurality of first metal wires and a plurality of second metal wires;

the strain sensors are arranged in a plurality of rows along a first direction, and the strain sensors in the same row are arranged at intervals along a second direction; each strain sensor comprises a first end and a second end, the first end of each strain sensor is electrically connected with the processing circuit through the first metal wire, and the second end of each strain sensor is electrically connected with the processing circuit through the second metal wire;

preferably, the first ends of the plurality of strain sensors located in the same column are electrically connected to the processing circuit through the same first metal trace, and the second ends of the plurality of strain sensors located in the same column are electrically connected to the processing circuit through corresponding second metal traces, respectively;

preferably, the first metal trace and the second metal trace are arranged on the same layer, and the strain sensor and the first metal trace are arranged on different layers;

preferably, orthographic projections of the first ends of the plurality of strain sensors on the substrate, which are positioned in the same column, are positioned on the same line; preferably, the extension direction of the straight line is parallel to the second direction; and/or the presence of a gas in the gas,

orthographic projections of the second ends of the strain sensors on the substrate in the same column are arranged in a staggered mode along the first direction.

3. The display panel of claim 1, further comprising:

the light-emitting layer is positioned between the touch layer and the substrate; the light-emitting layer comprises a plurality of light-emitting units arranged at intervals; the orthographic projection of the strain sensor on the substrate is not coincident with the orthographic projection of the light-emitting unit on the substrate.

4. The display panel of claim 2,

the processing circuit includes:

the gate circuit unit is electrically connected with the second metal wirings and is used for receiving actual electric signals output by the strain sensors in the same column in a time-sharing manner;

the acquisition unit is electrically connected with the first metal wire and the gate circuit unit and is used for acquiring and obtaining the corresponding actual electric signal of the strain sensor;

the processing unit is electrically connected with the acquisition unit and used for determining touch point positions based on the actual electric signals of each strain sensor;

5. the display panel of claim 4,

the gate circuit unit includes:

a control unit;

the shift register circuit is electrically connected with the control unit;

one end of one transistor is electrically connected with the shift register circuit, and the other end of one transistor is electrically connected with one second metal wire; the control unit controls the shift register circuit to sequentially transmit a pulse signal to each transistor so as to enable the corresponding transistor to be conducted; wherein only one of the transistors is turned on at the same time;

the acquisition unit includes:

a bridge connected to the gate cell, the first metal trace and the second metal trace;

the amplifying circuit is electrically connected with the electric bridge and is used for amplifying the signal output by the electric bridge;

and the analog-to-digital conversion circuit is electrically connected with the amplifying circuit and is used for converting the signal provided by the amplifying circuit to obtain the actual electric signal of the strain sensor.

6. The display panel of claim 4, wherein the processing unit is specifically configured to:

determining the difference of the actual electric signal relative to a preset electric signal based on the actual electric signal of each strain sensor, and obtaining a touch area and touch center coordinates of the touch area based on at least one strain sensor of which the difference is greater than a threshold value;

and obtaining pixel coordinates of a light-emitting unit corresponding to the touch center based on the touch center coordinates, wherein the pixel coordinates are the touch point positions.

7. The touch control method of the display panel is characterized in that the display panel comprises a substrate; the touch layer is positioned on the substrate and comprises a plurality of strain sensors distributed in an array; the processing circuit is electrically connected with the strain sensors and used for determining touch point positions based on actual electric signals of the strain sensors;

the touch control method comprises the following steps:

acquiring and obtaining an actual electric signal of each strain sensor on the display panel;

and determining touch point positions based on the actual electric signals of each strain sensor.

8. The touch method of claim 7,

the step of determining touch location based on the actual electrical signal of each strain sensor comprises:

determining the difference of the actual electric signal relative to a preset electric signal based on the actual electric signal of each strain sensor, and obtaining a touch area and touch center coordinates of the touch area based on at least one strain sensor of which the difference is greater than a threshold value;

obtaining pixel coordinates of a light-emitting unit corresponding to the touch center based on the touch center coordinates, wherein the pixel coordinates are the touch point positions;

optionally, the method further comprises:

obtaining the pressure level of each strain sensor in the touch area based on the touch center coordinates and the difference amount of each strain sensor in the touch area;

and executing corresponding operation based on the pressure grade and the touch point position.

9. The touch method of claim 8,

the step of determining a difference amount of an actual electrical signal from a preset electrical signal based on the actual electrical signal of each strain sensor, and obtaining a touch area and a touch center coordinate of the touch area based on at least one strain sensor of which the difference amount is greater than a threshold value includes:

obtaining a first coordinate of a first strain sensor with the largest difference in the touch area;

obtaining a differential amount of the strain sensors adjacent to the first strain leaflet;

obtaining the touch center coordinate based on the first coordinate and the difference fitting of the strain sensors adjacent to the first strain leaflet;

optionally, the obtaining the touch center coordinate based on the first coordinate and the fitting of the difference amount of the strain sensor adjacent to the first strain leaflet includes:

obtaining the touch center coordinates (X, Y) by fitting according to the following formula:

wherein x is ₀ An abscissa, y, representing said first coordinate ₀ A vertical coordinate representing the first coordinate, a being a length of the first strain sensor in the first direction X, B being a width of the first strain sensor in the second direction Y, wherein a is a difference amount of the first strain sensor, B, c are difference amounts of two strain sensors adjacent to the first strain sensor in the second direction Y, d, e are difference amounts of two strain sensors adjacent to the first strain sensor in the first direction X;

preferably, the step of obtaining pixel coordinates of a light-emitting unit corresponding to the touch center based on the touch center coordinates, where the pixel coordinates are the touch point locations, includes:

assuming that the length and width of a single pixel in a first direction X and a second direction Y are both e, (X, Y) is the touch center coordinate of a touch area, the pixel coordinate of a light emitting unit corresponding to the touch center is obtained by the following formula:

x＝int(X/e)

y＝int(Y/e)

the (x, y) coordinates are the pixel coordinates mapped by the touch center coordinates, and the pixel coordinates are the touch point locations.

10. The touch method of claim 8,

the step of obtaining the pressure level of each strain sensor in the touch area based on the touch center coordinates and the difference amount of each strain sensor in the touch area includes:

obtaining a current touch type based on the relative position relation between the touch center coordinates and the strain sensor in the touch area;

acquiring a target expansion coefficient corresponding to the current touch type according to a preset corresponding relation between the touch type and the expansion coefficient;

determining the pressure level based on the target expansion coefficient and the amount of difference for each of the strain sensors within the touch area;

preferably, the step of obtaining a current touch type based on a relative position relationship between the touch center coordinates and the strain sensor in the touch area includes:

if the touch center coordinate is located inside the strain sensor in the touch area, determining that the touch type is a first touch type;

if the touch center coordinate is located between two adjacent strain sensors in the touch area, determining that the touch type is a second touch type;

if the touch center coordinate is located in the middle of four adjacent strain sensors in the touch area, determining that the touch type is a third touch type;

the expansion coefficient corresponding to the second touch type is smaller than the expansion coefficient corresponding to the first touch type and larger than the expansion coefficient corresponding to the third touch type.

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