Display panel and driving method thereof, and display device

Abstract

The present application provides a display panel and a driving method thereof, and a display device, wherein the display panel includes: a signal reading circuit, a plurality of first gating units electrically connected to the signal reading circuit, and a plurality of photosensitive sensors located in a display area; the plurality of photosensitive sensors are distributed in a plurality of read-write partitions in the display area and arranged in an array; the plurality of first gating units are electrically connected to a plurality of read control signal terminals, respectively, and are electrically connected to the photosensitive sensors in the plurality of read-write partitions, respectively; the plurality of read control signal terminals are used to respectively input read control signals to the plurality of first gating units, so that the plurality of first gating units are turned on in time-sharing, and each first gating unit outputs the photosensitive signal output by the connected photosensitive sensor to the signal reading circuit when turned on. The technical solution of the present application can realize time-sharing multiplexing of the same signal reading circuit, reduce the number of signal reading circuits, and thus reduce the occupied space.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a driving method thereof, and a display device. Background Art

[0002] Smart devices such as mobile phones and tablets usually provide fingerprint recognition functions to collect fingerprints in order to identify the user's identity. Optical fingerprint recognition is one of the common means to achieve fingerprint recognition. The current optical fingerprint recognition technology is mostly implemented using photosensitive sensors (also called fingerprint collection pixels or photosensitive pixels). The principle is: when the user's finger touches the screen of the smart device, the external ambient light or the light emitted by the mobile device's own light source is reflected or transmitted by the finger and irradiated onto the photosensitive sensor to generate an electric charge. The charge can be read by the back-end signal reading circuit to realize fingerprint collection.

[0003] The existing in-screen optical fingerprint recognition technology requires multiple signal reading circuits to be set up at the back end to achieve full-screen fingerprint collection, which takes up a large space and is not conducive to mass production and the thinness of smart devices such as mobile phones and tablets. Summary of the invention

[0004] The embodiments of the present application provide a display panel and a driving method thereof, and a display device to solve the problems existing in the related art. The technical solutions are as follows:

[0005] In a first aspect, an embodiment of the present application provides a display panel, comprising: a signal reading circuit, a plurality of first gating units electrically connected to the signal reading circuit, and a plurality of photosensitive sensors located in a display area;

[0006] A plurality of light-sensitive sensors are distributed in a plurality of read-write partitions in the display area and arranged in an array;

[0007] A plurality of first selection units are electrically connected to the plurality of read control signal terminals, respectively, and are electrically connected to the photosensitive sensors in the plurality of read-write partitions, respectively;

[0008] The multiple read control signal terminals are used to respectively input read control signals to the multiple first selection units, so that the multiple first selection units are turned on in time division. When turned on, each first selection unit outputs the photosensitive signal output by the connected photosensitive sensor to the signal reading circuit.

[0009] In a second aspect, an embodiment of the present application provides a display device, including: a display panel provided by any embodiment of the present application.

[0010] In a third aspect, an embodiment of the present application provides a method for driving a display panel, including:

[0011] The plurality of read control signal terminals output read control signals to the plurality of first selection units respectively, so that the plurality of first selection units are turned on in time division, and each first selection unit outputs the photosensitive signal output by the connected photosensitive sensor to the signal reading circuit when turned on.

[0012] In a fourth aspect, an embodiment of the present application provides a method for driving a display panel, comprising:

[0013] In the touch detection stage, the touch area in the display area is determined according to the change of the photosensitive signals of the photosensitive devices in different read-write partitions in the display area;

[0014] During the fingerprint collection stage, the read control signal terminal corresponding to the touch area outputs a read control signal to the first selection unit corresponding to the touch area, turning on the first selection unit and outputting the photosensitive signal output by the photosensitive sensor in the touch area to the signal reading circuit.

[0015] The advantages or beneficial effects of the above technical solution include at least:

[0016] Through the control of multiple read control signals, multiple first selection units can be turned on in time-sharing mode, thereby realizing time-sharing multiplexing of the same signal reading circuit. Only one signal reading circuit is needed to read the photosensitive signals of the photosensitive sensors in multiple read-write partitions, thereby realizing fingerprint collection of multiple read-write partitions. In the case of a high resolution display panel, the above technical solution can effectively reduce the number of signal reading circuits, thereby reducing the space occupied, which is conducive to mass production and reducing the size of smart devices such as mobile phones and tablets, and realizing the thinness of smart devices.

[0017] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0019] Figure 1 is a schematic diagram of the structure of a display panel in the related art;

[0020] Figure 2 A schematic diagram of the circuit principle of a display panel structure in the related art;

[0021] Figure 3 A schematic diagram of a structural framework of a display panel provided in an embodiment of the present application;

[0022] Figure 4 A schematic structural diagram of an optional implementation of a display panel provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the circuit principle of a part of the structure of the display panel provided in an embodiment of the present application;

[0024] Figure 6 A schematic structural diagram of another optional implementation of a display panel provided in an embodiment of the present application;

[0025] Figure 7 A signal timing diagram of a display panel driving method provided in an embodiment of the present application;

[0026] Figure 8 A schematic flow chart of another method for driving a display panel provided in an embodiment of the present application;

[0027] Fig. 9 A signal timing diagram of another display panel driving method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0029] The inventor of this application discovered in his research that in the related technologies of optical fingerprint recognition, the fingerprint recognition acquisition module is integrated with the display module to realize in-screen fingerprint recognition, and the photosensitive sensor is arranged in the entire display area of ​​the display panel to realize full-screen fingerprint acquisition, that is, fingerprint acquisition can be performed at any position on the screen. This full-screen fingerprint acquisition pixel design has a high pixel resolution of 1800*768, that is, 1800 pixels in one column and 768 pixels in one row.

[0030] In the related art, the arrangement of the photosensitive sensors is as follows: Figure 1 As shown, the principle of fingerprint collection based on one of the photosensitive sensors in this arrangement is as follows Figure 2 shown.

[0031] Reference Figure 1 , a plurality of light-sensitive sensors 101 are arranged in the entire display area of ​​the display panel, and a plurality of scanning signal lines extend in the horizontal direction (such as Figure 1G1 to G3 shown), multiple read signal lines (such as Figure 1 The R1 to R2, R255 to R258, R511 to R512 shown in the figure extend in the vertical direction. The photosensors in the same row are electrically connected to the gate drive circuit 102 through the same scanning signal line in the horizontal direction, and the photosensors in the same column are electrically connected to the signal reading circuit 103 through the same reading signal line in the vertical direction. The gate drive circuit inputs a scanning signal to turn on the transistor Tgate in the photosensor 101, and the electrical signal generated by the photosensor PIN (including photosensors of P-type semiconductors, intrinsic semiconductors and N-type semiconductors) in the photosensor is read out to the signal reading circuit through the turned-on transistor Tgate and the scanning signal line, and then read out to other circuits at the back end. Figure 2 , the transistor Tgate is connected to other components through vias.

[0032] Reference Figure 2 When the photosensitive device PIN (including the diode and the capacitor Cs) receives light intensity, charges will be accumulated at both ends of the photosensitive device PIN. When the scanning signal GATE controls the transistor Tgate to turn on, the charges on the photosensitive device PIN will be output to the capacitor Cf in the signal reading circuit 103 through the transistor Tgate. When the transistor Tgate is closed, the signal reading circuit 103 outputs the signal Vout to other circuits at the back end, such as the analog-to-digital conversion circuit (ADC), so that the charges accumulated at both ends of the photosensitive device PIN during a period of integration time can be read. Figure 2 , the transistor Tgate is connected to other components through vias.

[0033] The signal reading circuit used in the related art usually has 256 signal channels, that is, one signal reading circuit can only be connected to one reading signal line, and then can only be connected to one column of photosensors. When the number of columns of photosensors in the display area (the same as the number of reading signal lines) is greater than 256, that is, when the pixel resolution is high, at least two signal reading circuits are required to connect all photosensors. Each time the signal is read, in order to reduce power consumption, usually only one signal reading circuit is working. More than two signal reading circuits occupy a large space, and in actual production, the mass production cost is high, and when integrated into smart devices such as mobile phones and tablets, they occupy a large space.

[0034] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0035] The present application embodiment provides a display panel, such as Figure 3As shown, the display panel includes: a signal reading circuit 301, a plurality of first gating units 302 electrically connected to the signal reading circuit 301, and a plurality of photosensitive sensors 303 located in a display area.

[0036] Multiple photosensitive sensors 303 are distributed in multiple read-write partitions (such as Figure 3 The first selection units 302 are respectively connected to the plurality of read control signal terminals ( Figure 3 ) and are electrically connected to the photosensitive sensors 303 in the plurality of read-write partitions ( Figure 3 This connection is not directly shown).

[0037] The multiple read control signal terminals are used to respectively input read control signals to the multiple first selection units 302, so that the multiple first selection units 302 are turned on in time division. When turned on, each first selection unit 302 outputs the photosensitive signal output by the connected photosensor to the signal reading circuit.

[0038] Figure 3 Only two first gating units and two read-write partitions are shown as examples. In actual applications, the display panel may have more first gating units and read-write partitions.

[0039] The display panel provided in the embodiment of the present application can make multiple first selection units conduct in time by controlling multiple read control signals, thereby realizing time-sharing multiplexing of the same signal reading circuit, and only one signal reading circuit is needed to read the photosensitive signals of the photosensitive sensors in multiple read-write partitions, thereby realizing fingerprint collection of multiple read-write partitions. In the case of a high resolution display panel and a high pixel density (Pixels Per Inch, PPI), the above scheme can effectively reduce the number of signal reading circuits, thereby reducing the space occupied, which is conducive to mass production and reducing the size of smart devices such as mobile phones and tablet computers, and realizing the thinness of smart devices.

[0040] Optionally, each first selection unit 302 includes multiple selection branches, and each selection branch in the same first selection unit 302 is electrically connected to the same read control signal terminal; each read control signal terminal is used to synchronously output a read control signal to multiple selection branches in a connected first selection unit 302, so that the multiple selection branches are synchronously turned on or off.

[0041] The synchronous conduction of multiple selection branches in the same first selection unit can make the signal reading circuit simultaneously connected to the path between multiple columns of photosensors in the same read-write partition, so that during a single use of the signal circuit, the signal reading circuit can read the photosensitive signals of multiple columns of photosensors in a read-write partition, thereby realizing fingerprint collection for the read-write partition.

[0042] Figure 4 An example diagram of a display panel provided by an embodiment of the present application is shown. Figure 4 2 shows two first gating units 302 as an example, and each of the two first gating units 302 includes a plurality of gating branches. Each gating branch in the first first gating unit 302 is connected to the first read control signal terminal ( Figure 4 ) is electrically connected to receive the read control signal EN1 output by the first read control signal terminal, and the read control signal EN1 can make each gating branch in the first first gating unit 302 synchronously turned on or off; each gating branch in the second first gating unit 302 is connected to the second read control signal terminal ( Figure 4 The second first gating unit 302 is electrically connected to the first gating unit 302 (not shown) to receive the read control signal EN2 output by the second read control signal terminal. The read control signal EN2 can make each gating branch in the second first gating unit 302 synchronously turned on or off.

[0043] Optionally, the signal reading circuit 301 includes multiple signal channels; the number of selection branches in each first selection unit 302 is the same as the number of signal channels in the signal reading circuit; and the multiple selection branches in each first selection unit are electrically connected to the multiple signal channels respectively.

[0044] By setting the number of gating branches of the first gating unit based on the number of signal channels in the signal reading circuit, full utilization of the signal reading circuit can be achieved.

[0045] Reference Figure 4 In the example of FIG. 3 , the signal reading circuit 301 includes 256 signal channels, and the number of gating branches in the two first gating units 302 is 256.

[0046] In the embodiment of the present application, the read-write partitions can be divided according to the number of signal channels in the signal reading circuit 301. Figure 4 For example, when the signal reading circuit 301 includes 256 signal channels, the area where each 256 columns of photosensors 303 are located can be divided into a read-write partition. Figure 4 There are 512 columns of photosensors 303, which can be evenly divided into two read-write partitions; in the embodiment of the present application, the read-write partitions can also be divided according to other actual needs, which is not limited in the embodiment of the present application.

[0047] The number of the first selection units 302 and the number of the read control signal terminals in the embodiment of the present application can be set according to the number of read-write partitions. Figure 4For example, for the two divided read-write partitions, two first selection units 302 and two read control signal terminals can be correspondingly set to respectively control the on-off of the path between the photosensitive sensor 303 and the signal reading circuit 301 in the two read-write partitions.

[0048] In the embodiment of the present application, the photosensitive sensors 303 of the corresponding columns in different read-write partitions can be electrically connected to the same signal channel of the signal reading circuit 301 through the gating branches at the corresponding positions of different gating units to realize the multiplexing of the same signal channel, and then realize the multiplexing of the same signal reading circuit. The above-mentioned corresponding columns are the columns with the same serial number in different read-write partitions, for example Figure 4 The first column in read-write partition 1 and the first column in read-write partition 2 (the 257th column in total) are corresponding columns, the second column in read-write partition 1 and the second column in read-write partition 2 (the 258th column in total) are corresponding columns, and the same goes for other corresponding columns. The above-mentioned method for determining corresponding positions is similar to the method for determining corresponding columns. When the two selection branches of each group of corresponding positions are turned on in time, the photosensors 303 of each group of corresponding columns can also be turned on in time and output corresponding photosensitivity signals.

[0049] Optional, see Figure 4 For example, the photosensitive sensor 303 includes: a photosensitive device (such as Figure 4 PIN shown in FIG. 1 ) and a second gating unit Tgate; a second gating unit Tgate, whose control end is connected to a scanning signal line (such as Figure 1 The first end is electrically connected to the photosensitive device in the photosensitive sensor 303, and the second end is electrically connected to the read signal line (such as the read signal line in the read-write partition) in the corresponding Figure 4 One of the R1 to R2, R255 to R258, and R511 to R512 shown is electrically connected to the corresponding enable branch.

[0050] Based on the above structure, the photosensitive device can output the photosensitive signal through the corresponding second selection unit, the reading signal line and the selection branch. The dual selection setting of the second selection unit and the selection branch can enable the display panel to realize time-sharing multiplexing of the signal reading circuit while meeting the normal refresh frequency.

[0051] exist Figure 4 In the example, for the first column, the control ends of the second selection units Tgate in the three photosensors 303 are electrically connected to the gate driving circuit through the scanning signal lines G1, G2, and G3, respectively, and the second ends of the second selection units Tgate in the three photosensors 303 in the first column are electrically connected to the first selection branch in the first first selection unit 302 through the first reading signal line R1. The connection method of the second selection units Tgate in the photosensors 303 in the remaining columns is similar to that of the first column and will not be repeated.

[0052] Figure 4 Only two first gating units 302 and two read-write partitions are shown as examples. In actual applications, more first gating units and read-write partitions may be included.

[0053] Figure 5 Shows Figure 4 The schematic circuit diagram shows the connection between the photosensitive sensors 303 in the two read-write partitions and the signal reading circuit 301.

[0054] Figure 5 PIN1 indicates Figure 4 The photosensitive device in the photosensitive sensor 303 in the first row and first column (the first row and first column of the read-write partition 1), Tgate1 represents the second gating unit in the photosensitive sensor 303 in the first row and first column; PIN2 represents Figure 4 The photosensitive device in the photosensitive sensor 303 in the second row and second column (the second row and second column of the read-write partition 1), Tgate2 represents the second gating unit in the photosensitive sensor 303 in the second row and second column; PIN257 represents Figure 4 The photosensitive device in the photosensitive sensor 303 at the 257th column of the 1st row (the 1st column of the read-write partition 2), Tgate257 represents the second selection unit in the photosensitive sensor 303 at the 257th column of the 1st row; PIN258 represents Figure 4 The photosensitive device in the photosensitive sensor 303 at the 2nd row and the 258th column (the 2nd row and the 2nd column of the read-write partition 2), Tgate258 represents the second gating unit in the photosensitive sensor 303 at the 2nd row and the 258th column. Ten1, Ten2, Ten257 and Ten258 are transistors of the gating branches corresponding to the photosensitive sensors 303 at the 1st column, the 2nd column, the 257th column and the 258th column, respectively.

[0055] Reference Figure 5 In the upper half of the circuit, the photosensitive device PIN1, the second selection unit Tgate1 and the transistor Ten1 are connected in series, wherein the gate of the second selection unit Tgate1 can be connected to the scanning signal GATE1 output by the gate driving circuit 304 through the scanning signal line G1, and the gate of the transistor Ten1 can be connected to the reading control signal EN1 output by the first reading control signal terminal. The photosensitive device PIN257, the second selection unit Tgate257 and the transistor Ten257 are connected in series, wherein the gate of the second selection unit Tgate257 can be connected to the scanning signal GATE1 output by the gate driving circuit 304 through the scanning signal line G1, and the gate of the transistor Ten1 can be connected to the reading control signal EN2 output by the second reading control signal terminal.

[0056] In the above structure, the second selection unit Tgate1 in the 1st column and the second selection unit Tgate257 in the 257th column are connected to the same scanning signal GATE1, and the transistor Ten1 corresponding to the 1st column and the transistor Ten257 corresponding to the 257th column are connected to different reading control signals, namely EN1 and EN2, respectively. EN1 and EN2 can control the transistor Ten1 and the transistor Ten257 to be turned on in time-sharing manner, so that the two photosensitive devices PIN1 and PIN257 can output the photosensitive signal PD to the signal channel 1 of the signal reading circuit 301 in time-sharing manner.

[0057] Reference Figure 5 In the lower half of the circuit, the photosensitive device PIN2, the second selection unit Tgate2 and the transistor Ten2 are connected in series, wherein the gate of the second selection unit Tgate2 can be connected to the scanning signal GATE2 output by the gate driving circuit 304 through the scanning signal line G2, and the gate of the transistor Ten2 can be connected to the reading control signal EN1 output by the first reading control signal terminal. The photosensitive device PIN258, the second selection unit Tgate258 and the transistor Ten258 are connected in series, wherein the gate of the second selection unit Tgate258 can be connected to the scanning signal GATE2 output by the gate driving circuit 304 through the scanning signal line G2, and the gate of the transistor Ten2 can be connected to the reading control signal EN2 output by the second reading control signal terminal.

[0058] In the above structure, the second selection unit Tgate2 in the 2nd column and the second selection unit Tgate258 in the 258th column are connected to the same scanning signal, namely GATE2, and the transistor Ten2 corresponding to the 2nd column and the transistor Ten258 corresponding to the 258th column are connected to different reading control signals, namely EN1 and EN2 respectively. EN1 and EN2 can control the transistor Ten2 and the transistor Ten258 to be turned on in time-sharing manner, so that the two photosensitive devices PIN2 and PIN258 can output the photosensitive signal PD to the signal channel 2 of the signal reading circuit 301 in time-sharing manner.

[0059] Figure 5 Only the related devices of the 1st column, the 2nd column, the 257th column and the 258th column are shown as examples, and the connection relationship and the principle of the output signal of the other columns are similar to those of the above four columns, which will not be repeated. Figure 5 In order to facilitate the distinction of different signal channels of the signal reading circuit 301, the same signal reading circuit 301 is shown in both the upper and lower parts, which does not mean that Figure 5 The circuit shown is provided with two signal reading circuits 301, Figure 5 The two parts of the signal reading circuit 301 shown in FIG. 3 should be the same signal reading circuit. Figure 5Vref is a reference voltage terminal, and OUT1 is an output signal of the signal reading circuit 301 .

[0060] In the embodiment of the present application, the scan signal line extends along a first direction, and the read signal line extends along a second direction. The first direction may be as follows: Figure 4 The horizontal direction shown, the second direction can be as Figure 4 Vertical orientation shown.

[0061] The selection branch and the second selection unit in the embodiment of the present application may include at least one transistor, which may be a single-gate transistor (having one gate) or a multi-gate transistor (having more than two gates). The transistor may be a thin-film transistor, a field-effect transistor or other devices with the same characteristics. The source (also called source electrode) and the drain (also called drain electrode) of each transistor are symmetrical, so their source and drain are interchangeable.

[0062] In the embodiment of the present application, the source of the transistor can be used as the first end of the gating branch or the second gating unit, and the drain can be used as the second end of the gating branch or the second gating unit, or the drain of the transistor can be used as the first end of the gating branch or the second gating unit, and the source can be used as the second end of the gating branch or the second gating unit, and the middle end of each transistor is the gate (also called the gate electrode) as the control end of the gating branch or the second gating unit. The at least one transistor can be a P-type transistor or an N-type transistor.

[0063] The photosensitive sensor in the embodiment of the present application can be a passive pixel sensor (Passive Pixel Sensor, PPS) or an active pixel sensor (Active Pixel Sensor, APS), or other types of pixel sensors, which are not limited in the embodiment of the present application. The circuit schematics shown in the embodiment of the present application all take passive pixel sensors as examples, but do not limit the present application.

[0064] The photosensitive device in the embodiment of the present application may be a photodiode, such as a PN photodiode (a diode formed by a P-type semiconductor and an N-type semiconductor), a PIN photodiode (a diode formed by a P-type semiconductor, an intrinsic semiconductor and an N-type semiconductor), an avalanche photodiode, etc., or other types of photosensitive devices, which are not limited in the embodiment of the present application. When the photosensitive device is a photodiode, the anode of the photodiode is electrically connected to the bias voltage terminal Vbias, and the cathode is electrically connected to the first end of the second gating unit Tgate.

[0065] Reference Figure 6 The display panel provided in the embodiment of the present application may include a plurality of gate driving circuits, each of which is connected to at least one scanning signal line (eg Figure 6G1 to G3 or G31 to G33) are electrically connected, and the area controlled by each gate driving circuit can be used as a scanning partition. Figure 6 Only two gate driving circuits 304 are shown as an example. In actual application scenarios, more gate driving circuits may be provided according to actual needs.

[0066] The gate driver circuit 304 may be a GOA (Gate Driver On Array, array substrate row driver) circuit, and each GOA circuit may include a plurality of cascaded GOA units. Figure 6 As shown, in the case where the gate drive circuit 304 is a GOA circuit, each gate drive circuit 304 has an independent frame start signal STV1 or STV2, and an independent first control signal VGH1 or VGH2, all gate drive circuits 304 can share clock signals GCK and GCB, and share the second control signal VGL, and under the control of the above signals, each gate drive circuit 304 can scan each row of photosensors 303 in a corresponding scanning partition.

[0067] Figure 6 In the figure, one gate driving circuit is connected to 30 rows of scanning signal lines to control 30 rows of photosensors. This number is only used as an example and does not limit the present application. In actual applications, the number of rows controlled by one gate driving circuit can be set according to actual needs.

[0068] Based on the same inventive concept, an embodiment of the present application further provides a method for driving a display panel, including:

[0069] The plurality of read control signal terminals output read control signals to the plurality of first selection units respectively, so that the plurality of first selection units are turned on in time division, and each first selection unit outputs the photosensitive signal output by the connected photosensitive sensor to the signal reading circuit when turned on.

[0070] The driving method of the display panel provided in the embodiment of the present application can realize the time-sharing conduction of multiple first gating units by respectively sending multiple reading control signals to multiple first gating units, thereby realizing the time-sharing multiplexing of the same signal reading circuit, and only one signal reading circuit is needed to read the photosensitive signals of the photosensitive sensors in multiple read-write partitions, thereby realizing the fingerprint collection of multiple read-write partitions. In the case of a high resolution display panel, the above scheme can help reduce the number of signal reading circuits, thereby reducing the space occupied, which is conducive to mass production and reducing the size of smart devices such as mobile phones and tablets, and realizing the lightness and thinness of smart devices.

[0071] Optionally, the above steps specifically include: each read control signal terminal outputs a read control signal to multiple selection branches in a first selection unit connected thereto, so that the multiple selection branches are synchronously turned on or off, and when turned on, the photosensitive signals output by the multiple photosensors connected thereto are synchronously output to the signal reading circuit.

[0072] The read control signal may include a first level stage and a second level stage. The first level may cause the corresponding enable branch to be synchronously turned on, and the second level may cause the corresponding enable branch to be synchronously turned off. The first level and the second level may be a high level and a low level, respectively, or a low level and a high level, respectively (this case will be used as an example in the subsequent timing diagram).

[0073] Based on the above method, multiple selection branches in the same first selection unit can be synchronously turned on, so that the signal reading circuit can be simultaneously turned on between multiple columns of photosensors in the same read-write partition, and then during a single use of the signal circuit, the signal reading circuit can read the photosensitive signals of multiple columns of photosensors in a read-write partition, thereby realizing fingerprint collection for the read-write partition.

[0074] Optionally, the display panel driving method provided in the embodiment of the present application further includes:

[0075] For each selection branch in the first selection unit, when the selection branch and the second selection unit connected to the selection branch are both turned on, the photosensitive signal of the photosensitive device in the photosensitive sensor to which the second selection unit belongs is output to the signal reading circuit through the second selection unit, the selection branch, and the reading signal line between the second selection unit and the selection branch.

[0076] Based on the above method, the photosensitive device can output the photosensitive signal through the corresponding second selection unit, the reading signal line and the selection branch. The dual selection setting of the second selection unit and the selection branch can enable the display panel to realize time-sharing multiplexing of the signal reading circuit while meeting the normal refresh frequency.

[0077] The connection relationship between the selection branch, the second selection unit, the photosensitive sensor, the signal reading circuit, etc. is as follows: Figure 4 As shown, Figure 4 The corresponding driving method timing signal is as follows Figure 7 As shown, Figure 7EN1 and EN2 are respectively two read control signal terminals providing read control signals to the two first selection units 302, GCK and GCB are clock signals provided to the gate drive circuit 304, STV is a frame start signal provided to the gate drive circuit 304, GATE1 and GATE2 are scanning signals provided by the gate drive circuit 304 to the first row photosensors 303 and the second row photosensors 303, PIN1 and PIN2 are respectively photosensors of the first row, first column and the second row, second column (also the first row, first column and the second row, second column of read-write partition 1), PIN257 and PIN258 are respectively photosensors of the first row, second column and the first row, second column (also the first row, first column and the second row, second column of read-write partition 2).

[0078] Combine the following Figure 7 and Figure 4 , the principle of the above driving method is introduced:

[0079] Under the control of the frame start signal STV, and the clock signals GCK and GCB, the gate drive circuit 304 outputs a scan signal GATE1 to the photosensors 303 in the first row, and outputs a scan signal GATE2 to the photosensors 303 in the second row. Both the scan signals GATE1 and GATE2 are pulse signals, and the valid signal of GATE2 is after the valid signal of GATE1.

[0080] In the first fingerprint acquisition stage, the read control signal EN1 is at a low level, the read control signal EN2 is at a high level, the gating branches corresponding to the read-write partition 1 are turned on, and the gating branches corresponding to the read-write partition 2 are turned off; the second gating unit in the first row and the second gating unit in the second row are turned on in time-sharing under the control of the scanning signals GATE1 and GATE2, and the second gating unit connected to the photosensitive device PIN1 of the read-write partition 1 is turned on first, at which time the photosensitive device PIN1 outputs a valid photosensitive signal (low-level signal) to the signal reading circuit 301, and then the second gating unit connected to the photosensitive device PIN2 of the read-write partition 1 is turned on, at which time the photosensitive device PIN2 outputs a valid photosensitive signal (low-level signal) to the signal reading circuit 301, and the signal reading circuit 301 can read the photosensitive signal of the read-write partition 1 to realize the fingerprint acquisition of the read-write partition 1.

[0081] In the second fingerprint acquisition stage, the read control signal EN1 is at a high level, the read control signal EN2 is at a low level, the gating branches corresponding to the read-write partition 1 are turned off, and the gating branches corresponding to the read-write partition 2 are turned on; the second gating unit in the first row of photosensors 303 and the second gating unit in the second row of photosensors 303 are turned on in time-sharing under the control of the scanning signals GATE1 and GATE2, and the second gating unit connected to the photosensitive device PIN257 of the read-write partition 2 is turned on first, at which time the photosensitive device PIN257 outputs a valid photosensitive signal (low-level signal) to the signal reading circuit 301, and then the second gating unit connected to the photosensitive device PIN258 of the read-write partition 2 is turned on, at which time the photosensitive device PIN258 outputs a valid photosensitive signal (low-level signal) to the signal reading circuit 301, and the signal reading circuit 301 can read the photosensitive signal of the read-write partition 2 to realize the fingerprint acquisition of the read-write partition 2.

[0082] Figure 7 Only the signal timing of the scanning signal and the photosensitive signal of some rows or columns is shown. Figure 7 Based on the signal timing shown, the signal timings of the scanning signals and photosensitive signals corresponding to other rows or columns are similar.

[0083] Based on the same inventive concept, the embodiment of the present application further provides a method for driving a display panel, such as Figure 8 As shown, the method includes:

[0084] S801, in the touch detection stage, determining a touch area in the display area according to changes in photosensitive signals of photosensitive devices in different read-write partitions in the display area;

[0085] S802, in the fingerprint collection stage, the read control signal terminal corresponding to the touch area outputs a read control signal to the first selection unit corresponding to the touch area, so that the first selection unit is turned on and the photosensitive signal output by the photosensitive sensor in the touch area is output to the signal reading circuit.

[0086] The driving method of the display panel provided in the embodiment of the present application can determine the touch area in the display area based on the change of the photosensitive signal, which can effectively reduce the area for fingerprint collection. Fingerprint collection is performed in the reduced fingerprint collection area, that is, the touch area, and the remaining areas do not need to be collected, which can effectively improve the efficiency of fingerprint collection and reduce power consumption.

[0087] In the process of fingerprint collection in the touch area, by sending multiple read control signals to multiple first selection units respectively, the time-sharing conduction of multiple first selection units can be realized, and then the time-sharing multiplexing of the same signal reading circuit can be realized. Only one signal reading circuit is needed to read the photosensitive signals of the photosensitive sensors in multiple read-write partitions, so as to realize fingerprint collection of multiple read-write partitions. In the case of a high resolution display panel, the above scheme can help reduce the number of signal reading circuits, thereby reducing the space occupied, which is conducive to mass production and reducing the size of smart devices such as mobile phones and tablets, and realizing the lightness and thinness of smart devices.

[0088] Optionally, the touch detection phase may include a first touch detection phase and a second touch detection phase.

[0089] In the first touch detection stage, when all the photosensors in multiple read-write partitions are turned on, multiple read control signal terminals respectively output read control signals to multiple first selection units, so that the multiple first selection units are turned on or off in time-sharing. When turned on, each first selection unit outputs the photosensitive signal output by the connected photosensor to the signal reading circuit, and determines the area where the signal change occurs according to the photosensitive signal as the initial touch area.

[0090] In the second touch detection stage, the gate drive circuit corresponding to the initial touch area outputs a scanning signal to the connected multiple rows of photosensors in a time-sharing manner, and the read control signal end corresponding to the initial touch area outputs a read control signal to the first selection unit corresponding to the initial touch area, so that the first selection unit is turned on, and the photosensitive signal output by the photosensor in the initial touch area is output to the signal reading circuit, and the area in the initial touch area where the signal change occurs is determined according to the photosensitive signal as the touch area.

[0091] Based on the above method, the initial touch area (which can be a read-write partition or a column pixel area) can be first determined in each read-write partition divided along the first direction. Based on the determined initial touch area, the area where the signal change occurs can be further determined in each scanning partition divided along the second direction, and then the touch area can be accurately determined by combining the signal changes in the two directions.

[0092] The connection relationship between the selection branch, the second selection unit, the photosensitive sensor, the signal reading circuit, etc. is as follows: Figure 6 As shown, Figure 6 The corresponding driving method timing signal is as follows Fig. 9 As shown, Fig. 9EN1 and EN2 are two read control signal terminals respectively provided to the two first gating units 302 for read control signals, GCK and GCB are clock signals provided to the gate drive circuit 304, STV1 and STV2 are respectively provided to the two gate drive circuits 304 for frame start signals, GOA1-GATE1 and GOA1-GATE2 are respectively Figure 6 The first gate driving circuit 304 shown in the figure provides scanning signals GOA2-GATE1 and GOA2-GATE2 to the first row of photosensors 303 and the second row of photosensors 303 in scanning partition 1, respectively. Figure 6 The second gate drive circuit 304 shown is provided to the first row ( Figure 6 Total 31 rows) photosensor 303 and 2 rows ( Figure 6 (Total 32 lines) Scanning signal of photosensor 303.

[0093] PIN1 and PIN2 are both photosensors in the overlapping area of ​​read-write partition 1 and scan partition 1, wherein they are photosensors at row 1, column 1 and row 1, column 2 (also row 1, column 1 and row 2, column 2 of read-write partition 1); PIN31 and PIN32 are both photosensors in the overlapping area of ​​read-write partition 1 and scan partition 2, wherein they are photosensors at row 31, column 1 and row 32, column 2 (also row 31, column 1 and row 32, column 2 of read-write partition 1); PIN257 and PIN258 are both photosensors in the overlapping area of ​​read-write partition 2 and scan partition 1, wherein they are photosensors at row 1, column 257 and row 2, column 258 (also row 1, column 1 and row 2, column 2 of read-write partition 2).

[0094] Combine the following Fig. 9 and Figure 6 , the principle of the above driving method is introduced:

[0095] In the first touch detection stage, under the control of the frame start signal STV1 and the clock signals GCK and GCB, Figure 6 The first gate drive circuit 304 in the embodiment outputs scanning signals GOA1-GATE1 and GOA1-GATE2 to the photosensitive sensors 303 in the first and second rows; under the control of the frame start signal STV2 and the clock signals GCK and GCB, Figure 6 The second gate drive circuit 304 in the embodiment outputs scanning signals GOA2-GATE1 and GOA2-GATE2 to the photosensors 303 in rows 31 and 31. In this stage, the scanning signals GOA1-GATE1, GOA1-GATE2, GOA2-GATE1 and GOA2-GATE2 are all pulse signals, and the pulse variation rules of the four signals are consistent.

[0096] In the first touch detection stage, the two gate drive circuits 304 output scanning signals under the control of frame start signals STV1 and STV2, and the second selection units of all rows in read-write partition 1 and read-write partition 2 (including rows 1 to 2 and rows 31 to 32) are synchronously turned on under the control of scanning signals (including signals GOA1-GATE1, GOA1-GATE2, GOA2-GATE1 and GOA2-GATE2). When any one or more photosensitive devices in read-write partition 1 and read-write partition 2 generate photosensitive signals, they can be output to the signal reading circuit 301 through the connected second selection units, read signal lines and selection branches. Based on the changes in the signals received by the signal reading circuit 301, the read-write partition where the photosensitive device generating the photosensitive signal is located can be determined as the initial touch area.

[0097] Specifically, when the read control signal EN1 is at a low level and the read control signal EN2 is at a high level, each strobe branch corresponding to the read-write partition 1 is turned on, and each strobe branch corresponding to the read-write partition 2 is turned off. If at least one photosensitive device in the read-write partition 1 outputs a photosensitive signal, causing the signal received by the signal reading circuit 301 to change, it means that the user has performed a touch, press, or other operation on the read-write partition 1, and the read-write partition 1 can be used as the initial touch area. Fig. 9 In this stage, the photosensitive devices PIN1, PIN2, PIN31 and PIN32 in the read-write partition 1 all output photosensitive signals, which means that the user has performed touch, press and other operations on the read-write partition 1, and the read-write partition 1 can be used as the initial touch area. Furthermore, based on the photosensitive signals output by PIN1, PIN2, PIN31 and PIN32, the pixel areas in the first and second columns can also be used as the initial touch area.

[0098] When the read control signal EN1 is at a high level and the read control signal EN2 is at a low level, the gate branches corresponding to the read-write partition 2 are turned on, and the gate branches corresponding to the read-write partition 1 are turned off. If at least one photosensitive device in the read-write partition 2 outputs a photosensitive signal, causing the signal received by the signal reading circuit 301 to change, it means that the user has performed touch, press, etc. operations on the read-write partition 2, and the read-write partition 2 can be used as the initial touch area. Fig. 9 In this stage, the photosensitive devices PIN257 and PIN258 in the read-write partition 2 both output photosensitive signals, which means that the user has performed touch, press, and other operations on the read-write partition 2, and the read-write partition 2 can be used as the initial touch area. Furthermore, based on the photosensitive signals output by PIN257 and PIN258, the pixel areas of the 257th and 258th columns can also be used as the initial touch area.

[0099] Assuming that the initial touch area determined in the first touch detection stage is the read-write partition 1, then in the second touch detection stage, the read control signal EN1 is a pulse signal, and the gate branches corresponding to the read-write partition 1 are periodically turned on and off, the read control signal EN2 maintains a high level, and the gate branches corresponding to the read-write partition 2 remain in the off state. The two gate drive circuits 304 output the scanning signal in time-sharing under the control of the time-sharing frame start signals STV1 and STV2, so that the second gate unit in the scanning partition 1 and the second gate unit in the scanning partition 2 are turned on in time-sharing, so as to respectively detect the signal changes of the two scanning partitions, and determine the scanning partition or row where the photosensitive device that generates the photosensitive signal is located as the touch area.

[0100] Specifically, refer to Fig. 9 In the example of, when the scanning signal (including GOA1-GATE1 and GOA1-GATE2) output by the first gate driving circuit 304 is at a low level and the scanning signal (including GOA2-GATE1 and GOA2-GATE2) output by the second gate driving circuit 304 is at a high level, the second gating units of all rows in the scanning partition 1 are turned on, and the second gating units of all rows in the scanning partition 2 are turned off. If at least one photosensitive device in the scanning partition 1 outputs a photosensitive signal, causing the signal received by the signal reading circuit 301 to change, it means that the user has performed touch, press, etc. operations in the scanning partition 1, and the touch area can be further determined based on the initial touch area of ​​the scanning partition 1. For example, Fig. 9 In this stage, if both the photosensitive devices PIN1 and PIN2 in the scanning partition 1 output photosensitive signals, it means that the user has performed a touch or press operation on the scanning partition 1. When the initial touch area is the read-write partition 1, the overlapping area of ​​the scanning partition 1 and the read-write partition 1 can be used as the touch area. Furthermore, based on the photosensitive signals output by the photosensitive devices PIN1 and PIN2, the overlapping area of ​​the pixel areas of the first and second rows and the initial touch area can also be used as the touch area.

[0101] Reference Fig. 9 In the example of, when the scanning signal output by the first gate driving circuit 304 is high level and the scanning signal output by the second gate driving circuit 304 is low level, the second gating units of all rows in the scanning partition 1 are turned off, and the second gating units of all rows in the scanning partition 2 are turned on. If at least one photosensitive device in the scanning partition 2 outputs a photosensitive signal, causing the signal received by the signal reading circuit 301 to change, it means that the user has performed touch, press, etc. in the scanning partition 2, and the touch area can be further determined based on the initial touch area of ​​the scanning partition 2. For example, Fig. 9In this stage, the photosensitive devices PIN31 and PIN32 in the scanning partition 2 both output photosensitive signals, which means that the user has performed touch, press, and other operations in the scanning partition 2. When the initial touch area is the read-write partition 2, the overlapping area of ​​the scanning partition 2 and the read-write partition 1 can be used as the touch area. Furthermore, based on the photosensitive signals output by the photosensitive devices PIN31 and PIN32, the overlapping area of ​​the pixel area of ​​the 31st and 32nd rows and the initial touch area can also be used as the touch area.

[0102] In the case where the touch area determined in the second touch detection phase is the overlapping area of ​​the scanning partition 1 and the read-write partition 1, in the fingerprint collection phase, if Fig. 9 , outputs a corresponding signal (with Figure 7 The signal timing in FIG. 1 is similar to that in FIG. 1 ) to realize fingerprint collection of the overlapping area.

[0103] It should be noted that Fig. 9 Only the scanning signals of four rows, GOA1-GATE1, GOA1-GATE2, GOA2-GATE1 and GOA2-GATE2, are shown as examples, and the scanning signals of other rows are similar to the scanning signals of these four rows, which will not be described in detail.

[0104] Fig. 9 Only the signal timing of the second touch detection stage is shown in the case where the initial touch area determined in the first touch detection stage is the read-write partition 1. If the initial touch area determined in the first touch detection stage is the read-write partition 2, then in the second touch detection stage, the read control signal EN1 is kept at a high level, the read control signal EN2 is a pulse signal, and the other signals are similar to the current Fig. 9 The signal timing of the second touch detection phase shown in FIG. 1 is as follows; if the initial touch area determined in the first touch detection phase is the read-write partition 1 and the read-write partition 2, then in the current Fig. 9 Based on the timing of each signal in the second touch detection stage shown in FIG. 1 , each signal needs to increase a timing. In the increased timing, the read control signal EN1 is kept at a high level, the read control signal EN2 is a pulse signal, and the other signals are similar to the current Fig. 9 The signal timing of the second touch detection stage is shown.

[0105] Fig. 9 The signal timing of the fingerprint collection stage is shown only when the touch area determined in the second touch detection stage is the overlapping area of ​​the scan partition 1 and the read-write partition 1. If the touch area determined in the second touch detection stage is the overlapping area of ​​other partitions or the overlapping area of ​​a column and row, the signal timing of the fingerprint collection stage can be adjusted according to the determined touch area, for example, a frame start signal corresponding to the overlapping area is output.

[0106] Based on the same inventive concept, an embodiment of the present application further provides a display device, including any display panel provided in the embodiment of the present application, and capable of executing any display panel driving method provided in the embodiment of the present application.

[0107] The display device provided in the embodiment of the present application may be a liquid crystal display device or an organic light emitting diode display device. For example, the display device may be a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, or any other product or component with a display function.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0109] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0110] Any process or method description in the flow chart or otherwise described herein can be understood to represent a module, fragment or portion of a code including one or more executable instructions for implementing the steps of a specific logical function or process. And the scope of the preferred embodiment of the present application includes other implementations, in which the functions may not be performed in the order shown or discussed, including in a substantially simultaneous manner or in a reverse order according to the functions involved.

[0111] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0112] The orientation or position relationship indicated by terms such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0113] In the description of the specification, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0114] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0115] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: A signal reading circuit, a plurality of first gating units electrically connected to the signal reading circuit, and a plurality of photosensitive sensors located in a display area; The plurality of light-sensitive sensors are distributed in a plurality of read-write partitions in the display area and arranged in an array; The plurality of first gating units are electrically connected to the plurality of read control signal terminals, respectively, and are electrically connected to the photosensitive sensors in the plurality of read-write partitions, respectively; The multiple read control signal terminals are used to respectively output read control signals to the multiple first selection units, so that the multiple first selection units are turned on in time, and each first selection unit outputs the photosensitive signal output by the connected photosensor to the signal reading circuit when turned on; wherein each first selection unit includes multiple selection branches, and each selection branch in the same first selection unit is electrically connected to the same read control signal terminal; each read control signal terminal is used to synchronously output a read control signal to multiple selection branches in a connected first selection unit, so that the multiple selection branches are synchronously turned on or off.

2. The display panel according to claim 1, characterized in that: The signal reading circuit includes a plurality of signal channels; The number of gating branches in each first gating unit is the same as the number of signal channels in the signal reading circuit; The multiple gating branches in each first gating unit are electrically connected to the multiple signal channels respectively.

3. The display panel according to claim 1 or 2, characterized in that: The photosensitive sensor comprises: a photosensitive device and a second gating unit; The second gating unit has a control end electrically connected to the gate driving circuit via a scanning signal line, a first end electrically connected to a photosensitive device in the corresponding photosensitive sensor, and a second end electrically connected to a corresponding gating branch via a read signal line in the corresponding read-write partition; The scanning signal line extends along a first direction, and the reading signal line extends along a second direction.

4. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 3.

5. A method for driving a display panel, characterized in that: include: The plurality of read control signal terminals output read control signals to the plurality of first gating units respectively, so that the plurality of first gating units are turned on in time division, and each first gating unit outputs the photosensitive signal output by the connected photosensitive sensor to the signal reading circuit when turned on; The plurality of read control signal terminals respectively output read control signals to the plurality of first gating units, so that the plurality of first gating units are turned on or off in time division, and each first gating unit outputs the photosensitive signal output by the connected photosensitive sensor to the signal reading circuit when turned on, including: Each read control signal terminal outputs a read control signal to multiple selection branches in a connected first selection unit, so that the multiple selection branches are synchronously turned on or off, and when turned on, the photosensitive signals output by the connected multiple photosensors are synchronously output to the signal reading circuit.

6. The method for driving a display panel according to claim 5, characterized in that: Also includes: The gate driving circuit outputs a scanning signal to the second gating units in the plurality of photosensitive sensors through the plurality of scanning signal lines, so as to turn on or off the plurality of second gating units; Synchronously outputting the photosensitive signals output by the connected plurality of photosensitive sensors to the signal reading circuit, comprising: For each selection branch in the first selection unit, when the selection branch and the second selection unit connected to the selection branch are both turned on, the photosensitive signal of the photosensitive device in the photosensitive sensor to which the second selection unit belongs is output to the signal reading circuit through the second selection unit, the selection branch, and the reading signal line between the second selection unit and the selection branch.

7. A method for driving a display panel, characterized in that: include: In the touch detection stage, the touch area in the display area is determined according to the change of the photosensitive signals of the photosensitive devices in different read-write partitions in the display area; In the fingerprint collection stage, the read control signal terminal corresponding to the touch area outputs a read control signal to the first selection unit corresponding to the touch area, so that the first selection unit is turned on and the photosensitive signal output by the photosensitive sensor in the touch area is output to the signal reading circuit; In the touch detection stage, the touch area in the display area is determined according to the change of the photosensitive signals of the photosensitive devices in different read-write partitions in the display area, including: In the first touch detection stage, when all the photosensors in the multiple read-write partitions are turned on, the multiple read control signal terminals respectively output read control signals to the multiple first gating units, so that the multiple first gating units are turned on or off in time division, and each first gating unit outputs the photosensitive signal output by the connected photosensor to the signal reading circuit when turned on, and determines the area where the signal change occurs according to the photosensitive signal as the initial touch area; In the second touch detection stage, the gate drive circuit corresponding to the initial touch area outputs a scanning signal to the connected multiple rows of photosensors in a time-sharing manner, and the read control signal end corresponding to the initial touch area outputs a read control signal to the first selection unit corresponding to the initial touch area, so that the first selection unit is turned on, and the photosensitive signal output by the photosensor in the initial touch area is output to the signal reading circuit, and the area where the signal change occurs in the initial touch area is determined according to the photosensitive signal as the touch area.

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