Display panel, control method thereof, and display device

Abstract

The present invention relates to a display panel, a control method thereof, and a display device, wherein the display panel includes a first electrode layer, an auxiliary electrode layer, an organic light-emitting layer, and a second electrode layer disposed in a display area; and further includes a touch module disposed in a non-display area, the touch module including a touch detection unit and a fingerprint recognition unit, the auxiliary electrode layer being connected to the touch detection unit and the fingerprint recognition unit, respectively, and the touch module being configured to perform touch detection and fingerprint recognition by detecting changes in capacitance between the auxiliary electrode layer and a human body. The auxiliary electrode layer of the display panel is reused as both a touch sensing electrode and a fingerprint recognition electrode. By reusing the electrodes, the thickness of the display panel can be reduced, while also enabling full-screen fingerprint recognition and touch detection functions without requiring a recess in the display panel, thereby improving operational convenience and aesthetics.

Description

Technical Field

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

[0002] With the development of technology, mobile terminals such as mobile phones have more and more functions, and mobile phones with fingerprint recognition function have become the current mainstream development.

[0003] Currently, fingerprint recognition functions are mainly implemented by creating a recess on the front or back of a display terminal and placing a fingerprint recognition component within the recess to facilitate fingerprint recognition. The inventors discovered during the implementation of this traditional technology that users can only perform fingerprint recognition within the recess, which affects the convenience of use. Summary of the Invention

[0004] Based on this, it is necessary to provide a display panel, a control method thereof, and a display device to address the problem that traditional display panels need to be provided with pits for fingerprint recognition, which affects the convenience of use.

[0005] A display panel comprises a display area and a non-display area arranged around the display area;

[0006] The display area also includes an auxiliary electrode layer and a touch module;

[0007] The auxiliary electrode layer is disposed in the display area;

[0008] The touch module is arranged in the non-display area, and the touch module includes a touch detection unit and a fingerprint recognition unit. The auxiliary electrode layer is respectively connected to the touch detection unit and the fingerprint recognition unit. The touch module is used to perform touch detection and fingerprint recognition by detecting the change in capacitance between the auxiliary electrode layer and the human body.

[0009] In one embodiment, the fingerprint recognition unit includes a capacitance detection circuit and a signal processing circuit, the capacitance detection circuit is connected to the auxiliary electrode layer and is used to detect the capacitance value of the auxiliary electrode layer, and the signal processing circuit is connected to the capacitance detection circuit and is used to receive the capacitance value and process the capacitance value.

[0010] In one embodiment, the touch module further includes a switch unit, one end of the switch unit is connected to the auxiliary electrode layer, and the other end is connected to the touch detection unit. When the switch unit is closed, the switch unit processes the capacitance value of the auxiliary electrode layer and outputs a touch signal to the touch detection unit.

[0011] In one embodiment, the display panel further includes an insulating layer and a first electrode layer, the auxiliary electrode layer is disposed on a surface of the insulating layer, and the first electrode layer is disposed on a surface of the insulating layer away from the auxiliary electrode layer;

[0012] A first via hole is provided on the insulating layer, and the auxiliary electrode layer is connected to the first electrode layer through the first via hole.

[0013] In one embodiment, the first electrode layer and the auxiliary electrode layer are connected to a positive driving voltage.

[0014] In one embodiment, the display panel further includes a first electrode layer, the auxiliary electrode layer is arranged in the same layer as the first electrode layer, the first electrode layer includes a plurality of first electrodes arranged at intervals, and the auxiliary electrode layer includes auxiliary electrodes arranged at intervals between the first motor poles.

[0015] In one embodiment, the display panel further includes an organic light-emitting layer and a second electrode layer, the organic light-emitting layer is disposed on a surface of the first electrode layer, and the second electrode layer is disposed on a surface of the organic light-emitting layer facing away from the first electrode layer; the second electrode layer and the auxiliary electrode layer are connected to the negative electrode of the driving voltage;

[0016] The display panel further includes a pixel defining layer, the pixel defining layer is provided with a via hole, and the auxiliary electrode is connected to the second electrode layer through the via hole.

[0017] A display device comprises the above-mentioned display panel.

[0018] In one embodiment, the display device includes a main control module, which is connected to the switch unit and is used to control the switch unit to be turned on when touch detection is performed.

[0019] A control method for a display panel, characterized in that the display panel includes a first electrode layer, an auxiliary electrode layer, an organic light-emitting layer, and a second electrode layer, wherein the first electrode layer is connected to a positive driving voltage, and the auxiliary electrode layer and the second electrode layer are connected to a negative driving voltage;

[0020] The method comprises the following steps:

[0021] detecting a state of the display panel;

[0022] obtaining a capacitance value of the auxiliary electrode layer;

[0023] When detecting that the display panel is in a locked state, constructing a fingerprint image according to the capacitance value;

[0024] Matching the fingerprint image with a preset image, if the similarity reaches a preset value, the match is successful, otherwise the match fails;

[0025] When detecting that the display panel is in a touch state, generating a touch signal according to the capacitance value;

[0026] Respond to the touch operation according to the touch signal.

[0027] The above-mentioned display panel and touch control method thereof reuse the auxiliary electrode layer, that is, the auxiliary electrode layer is reused as both a touch sensing electrode and a fingerprint recognition electrode. By reusing the electrodes, the thickness of the display panel can be reduced, and the full-screen fingerprint recognition function and touch detection function can also be realized. There is no need to open a pit on the display panel, thereby improving the operational convenience and aesthetics. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a display panel provided for one embodiment of the present application;

[0029] Figure 2 A schematic diagram of a display panel provided in yet another embodiment of the present application;

[0030] Figure 3 A structural diagram of a display panel provided for one embodiment of the present application;

[0031] Figure 4 A structural diagram of a display panel provided in yet another embodiment of the present application;

[0032] Figure 5 A structural diagram of a display panel provided in yet another embodiment of the present application;

[0033] Figure 6 A flow chart of a display panel control method provided in one embodiment of the present application. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] See Figure 1 One embodiment of the present application provides a display panel including a display area and a non-display area surrounding the display area. The display area of ​​the display panel is provided with an auxiliary electrode layer 120, while the non-display area is provided with a touch module 150. The auxiliary electrode layer 120 is connected to the touch module 150 via lead wires.

[0038] It should be noted that the display panel also includes a first electrode layer 110, an organic light-emitting layer 130, and a second electrode layer 140. The auxiliary electrode layer 120 can be connected in parallel with the first electrode layer 110 to reduce the wiring resistance of the first electrode layer 110, or connected in parallel with the second electrode layer 140 to reduce the resistance of the second electrode layer 140. It is understood that in this embodiment, the first electrode layer 110 can be an anode and the second electrode layer 140 can be a cathode. In addition, the display panel also includes a (Thin Film Transistor) array substrate, a packaging structure, a cover plate and other structures, which are well known in the art and will not be described in detail here.

[0039] The display panel also includes a touch module 150, located in the non-display area. The auxiliary electrode layer 120 is connected to the touch module 150 via lead wires. In this embodiment, the touch module 150 is an integrated chip that integrates touch and fingerprint recognition functions. The touch module 150 is connected to the auxiliary electrode layer 120. When a finger touches the screen, a capacitor is formed between the finger and the auxiliary electrode layer 120. The touch module 150 detects changes in the capacitance of the auxiliary electrode layer 120 to perform touch detection and fingerprint recognition.

[0040] The display panel provided in the above embodiment includes an auxiliary electrode layer, which is connected to the touch module via lead wires. The touch module is an integrated chip that integrates touch detection and fingerprint recognition functions. Therefore, when a finger touches the display panel, the capacitance value of the auxiliary electrode layer changes. By using the touch module to detect the capacitance change, touch detection and fingerprint recognition can be performed. Therefore, in this embodiment, the auxiliary electrode layer is reused as both a touch sensing electrode and a fingerprint recognition electrode. By reusing the electrodes, the thickness of the display panel can be reduced, and full-screen fingerprint recognition and touch detection functions can also be realized. There is no need to provide a pit on the display panel, thereby improving operational convenience and aesthetics.

[0041] See Figure 2 In one embodiment, the touch module 150 includes a touch detection unit 151 and a fingerprint recognition unit 152. The auxiliary electrode layer 120 is connected to the touch detection unit 151 and the fingerprint recognition unit 152 through lead wires.

[0042] Specifically, the fingerprint recognition unit 152 may include a capacitance detection circuit connected to the auxiliary electrode layer 120 for detecting changes in the capacitance value of the auxiliary electrode layer 120. In this embodiment, the auxiliary electrode layer 120 and the second electrode layer 140 are connected to the negative electrode of the driving voltage, that is, the driving voltage charges the auxiliary electrode layer 120. Because the fingerprint of a finger has valleys and ridges, the distance between valleys and valleys is approximately 300um-500um, and the height difference between valleys and ridges is approximately 100um-400um. When a touch occurs, the distance between the valleys and ridges of the fingerprint and the auxiliary electrode layer 120 is different. According to the relationship between capacitance value and distance, the capacitance value of the auxiliary electrode layer 120 corresponding to the valleys and the capacitance value of the auxiliary electrode layer 120 corresponding to the ridges are also different. The fingerprint recognition unit 152 also includes a data processing circuit connected to the capacitance detection circuit. After the capacitance detection circuit detects the capacitance of multiple sensing electrodes at the touch position, the capacitance value is sent to the data processing circuit. The data processing circuit processes the capacitance value and converts the data into data that can be recognized by the main control module of the display device, and then sends it to the main control module. The main control module reconstructs the valley and ridge patterns based on the detected capacitance value and compares it with the preset fingerprint pattern. If the comparison results are consistent, the unlocking is performed; if the comparison results are inconsistent, the unlocking is not performed. Therefore, by using a self-capacitive sensing capacitor, the signal strength can be increased, effectively generating a fingerprint recognition signal.

[0043] For further information, please see Figure 2The touch module 150 may also include a switch unit 153. One end of the switch unit 153 is connected to the auxiliary electrode layer 120, and the other end is connected to the touch detection unit 151. Because the finger touches a small area, the signal strength of the sensing capacitors is mixed, resulting in low touch sensitivity. Therefore, to improve touch sensitivity, the switch unit 153 can be used to connect the various sensing capacitors to form a sensor with a larger signal strength. The switch unit 153 integrates the signals of the multiple sensing capacitors into a single touch signal with a stronger signal strength and transmits it to the touch detection unit 151.

[0044] The touch detection unit 151 may also include a signal processing circuit for processing the received touch signal and sending it to the main control module, which is configured to respond to the corresponding touch operation according to the received signal.

[0045] In this embodiment, the touch module integrates touch detection and fingerprint recognition functions. Compared to traditional separate chips, the touch module provided by this embodiment improves chip integration. Furthermore, by using a switch unit to increase signal strength, it can improve touch sensitivity, enhance the user experience, and increase user convenience.

[0046] See Figure 3 In one embodiment, the display panel further includes an insulating layer 160. The auxiliary electrode layer 120 is disposed on one surface of the insulating layer 160, and the first electrode layer 110 is disposed on a surface of the insulating layer 160 facing away from the auxiliary electrode layer. A first via hole 161 is disposed in the insulating layer 160, and the auxiliary electrode layer 120 is connected to the first electrode layer 110 through the first via hole 161. It is understandable that the display panel provided in this embodiment can be a top-emitting display panel or a bottom-emitting display panel. When the display panel is a top-emitting display panel, the arrangement order of the film layers of the display panel is TFT array substrate, auxiliary electrode layer 120, insulating layer 160, first electrode layer 110, organic light-emitting layer 130, and second electrode layer 140. When the display panel is a bottom-emitting display panel, the arrangement order of the film layers of the display panel is TFT array substrate, second electrode layer 140, organic light-emitting layer 130, first electrode layer 110, insulating layer 160, and auxiliary electrode layer 120.

[0047] Specifically, the auxiliary electrode layer 120 can be connected to the same potential as the first electrode layer 110. In this embodiment, the first electrode layer 110 can be an anode connected to the positive driving voltage, so the auxiliary electrode layer 120 can also be connected to the positive driving voltage.

[0048] In the display panel provided by the above embodiment, since the auxiliary electrode layer 120 and the first electrode layer 110 are connected to the same potential and the auxiliary electrode layer 120 is connected in parallel with the first electrode layer 110 through the first via 161, the auxiliary electrode layer 120 can be used to reduce the wiring resistance of the first electrode layer 110, thereby improving the display effect of the display panel.

[0049] See Figure 4 In another embodiment, the auxiliary electrode layer 120 can be provided in the same layer as the first electrode layer 110. Figure 4 As shown, the display panel also includes a pixel defining layer 170 disposed on the surfaces of the first electrode layer 110 and the auxiliary electrode layer 120. The organic light-emitting layer 130 is disposed within the opening of the pixel defining layer 170, and the second electrode layer 140 is disposed on the surface of the organic light-emitting layer 130 facing away from the first electrode layer. A second via hole 171 is defined within the pixel defining layer 170, and the second via hole 171 is filled with a conductive medium. The auxiliary electrode layer 120 is connected to the second electrode layer 140 through the second via hole 171. Similarly, the display panel provided in this embodiment can be a top-emitting display panel or a bottom-emitting display panel. When the display panel is a top-emitting display panel, the first electrode layer 110 and the auxiliary electrode layer 120, the pixel defining layer 170, the organic light-emitting layer 130, and the second electrode layer 140 are sequentially disposed on the TFT array substrate of the display panel. When the display panel is a bottom-emitting display panel, the second electrode layer 140, the pixel defining layer 170, the organic light-emitting layer 130, and the first electrode layer 110 and the auxiliary electrode layer 120 are sequentially disposed on the TFT array substrate of the display panel.

[0050] Specifically, the first electrode layer 110 includes a plurality of first electrodes spaced apart, and the auxiliary electrode layer 120 includes auxiliary electrodes spaced apart between the first electrodes. Figure 5 In this embodiment, the auxiliary electrodes may include a first auxiliary electrode 121 extending along a first direction D1 and a second auxiliary electrode 122 extending along a second direction D2. The first auxiliary electrode 121 and the second auxiliary electrode 122 form a grid, wherein the first direction D1 is perpendicular to the second direction D2. The first auxiliary electrode 121 and the second auxiliary electrode 122 may be strip-shaped and disposed on the same layer as the anode, thereby reducing the thickness of the display panel. The first auxiliary electrode 121 and the second auxiliary electrode 122 may be made of the same material as the first electrode layer, such as nanosilver or graphene. Therefore, when manufacturing the display panel, the auxiliary electrode layer 120 and the first electrode layer 110 may be formed simultaneously to reduce process complexity. Of course, the auxiliary electrode layer 120 may also be disposed on the first electrode layer 110, and the material of the auxiliary electrode layer 120 may also be different from that of the first electrode layer 110, as long as they are conductive materials.

[0051] In the display panel provided by the above embodiment, the first auxiliary electrode 121 and the second auxiliary electrode 122 are connected to the negative pole of the driving voltage at the same time as the second electrode layer 140, and the first auxiliary electrode 121 and the second auxiliary electrode 122 are connected to the second electrode layer 140 through the second via 171. By connecting the auxiliary electrode layer 120 and the second electrode layer 140 in parallel, the wiring resistance of the second electrode layer 140 can be reduced and the brightness of the display panel can be improved.

[0052] In one embodiment, the touch module 150 includes a flexible circuit board, a bonding area is provided on the flexible circuit board, and the auxiliary electrode is connected to the touch module through the bonding area.

[0053] Specifically, the touch module 150 includes a flexible circuit board and an integrated chip arranged on the flexible circuit board. The first auxiliary electrode 121 and the second auxiliary electrode 122 have lead wires, which are routed along the frame of the display panel and connected to the bonding area on the flexible circuit board to achieve electrical connection between the first auxiliary electrode 121 and the second auxiliary electrode 122 and the touch module 150.

[0054] Another embodiment of the present application provides a display device comprising the aforementioned display panel. The display device further comprises a main control module, which is connected to a switch unit and is used to control the opening and closing of the switch unit. When feedback of a touch function is required, the main control module can control the closure of the switch in the switch unit. By using a switch unit to connect the various sensing capacitors to form a sensor with a large signal amount, the switch unit integrates the signals of the multiple sensing capacitors into a touch signal with a strong signal strength and transmits it to the touch detection unit, thereby improving touch sensitivity.

[0055] The main control module is also connected to the touch detection unit and the fingerprint recognition unit, and is used to respond to the touch function or fingerprint recognition function according to the screen status.

[0056] The above-mentioned display device realizes a full-screen fingerprint recognition function without increasing the thickness of the display panel by using an auxiliary electrode layer to reuse the electrodes of the touch sensing capacitor and the fingerprint recognition capacitor. There is no need to open pits on the display device to set physical buttons, the process is simple, and the convenience of operation and the appearance are improved.

[0057] See Figure 6 Another embodiment of the present application provides a method for controlling a display panel, wherein the display panel includes a display area and a non-display area. The display area includes a first electrode layer, an auxiliary electrode layer, an organic light-emitting layer, and a second electrode layer. The first electrode layer is connected to a positive driving voltage, and the auxiliary electrode layer and the second electrode layer are connected to a negative driving voltage. In this embodiment, the first electrode layer may be an anode, and the second electrode layer may be a cathode. The control method includes the following steps:

[0058] S100: Detecting the status of the display panel.

[0059] Before performing touch detection or fingerprint recognition, the main control module first detects the current state of the display panel and determines whether the display panel is in a locked state.

[0060] S200: Obtaining the capacitance value of the auxiliary electrode layer.

[0061] Specifically, this embodiment uses a touch module to obtain the capacitance value of the auxiliary electrode layer. The touch module includes a touch detection unit and a fingerprint recognition unit. Both the touch detection unit and the fingerprint recognition unit are connected to the auxiliary electrode layer. When a touch occurs, a capacitance is formed between the auxiliary electrode layer and the human body.

[0062] The fingerprint recognition unit detects the capacitance of the auxiliary electrode layer. Because a fingerprint has valleys and ridges, when a touch occurs, the distances between the valleys and ridges of the fingerprint and the auxiliary electrode layer differ. Based on the relationship between capacitance and distance, the capacitance of the auxiliary electrode layer corresponding to the valleys and ridges also differs.

[0063] S300: When it is detected that the display panel is in a locked state, a fingerprint image is constructed according to the capacitance value.

[0064] Specifically, when the display panel is detected to be locked, the main control module controls the fingerprint recognition unit to detect the capacitance value of the touch position, processes the detected capacitance value into a data format recognizable by the main control module, and then sends the processed capacitance value to the main control module. The main control module reconstructs the valley and ridge patterns based on the capacitance value to obtain a fingerprint image.

[0065] S400: Matching the fingerprint image with the pre-stored image. If the similarity reaches a preset value, the match is successful; otherwise, the match fails.

[0066] The main control module contains a pre-stored image, which is a pre-collected fingerprint image of a specific user. The main control module compares the acquired fingerprint image with the pre-stored image. If the similarity exceeds a preset value, the match is successful and the main control module performs the corresponding unlocking operation. Otherwise, the match fails and the main control module does not unlock the device.

[0067] S500: When it is detected that the display panel is in a touch state, a touch signal is generated according to the capacitance value.

[0068] It should be noted that this step can be performed simultaneously with step S300 or after step S400. Figure 4The control proceeds in the direction of the arrow shown, which is not limited in this embodiment. When the main control module detects that the display panel is in a touch state, it controls the touch detection unit to detect the capacitance value of the touch position. The touch detection unit includes a switching circuit, which is connected to the auxiliary electrode layer. When a touch occurs, the switching circuit is used to connect the multiple capacitors of the auxiliary electrode layer to form a large capacitor to increase the capacitance, and integrate the detected capacitance values ​​to form a touch signal and send it to the touch detection unit. The touch detection unit sends the received touch signal to the main control module.

[0069] S600: Responding to the touch operation according to the touch signal.

[0070] The main control module responds to the corresponding touch operation according to the received touch signal.

[0071] The control method of the above-mentioned display panel reuses the auxiliary electrode layer to collect the capacitance value on the auxiliary electrode layer to perform touch detection and fingerprint recognition respectively. By reusing the electrodes, the thickness of the display panel is reduced and the full-screen fingerprint recognition function can be realized.

[0072] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A display panel, characterized in that: comprising a display area and a non-display area arranged around the display area; The display panel further includes an auxiliary electrode layer and a touch module; The auxiliary electrode layer is provided in the display area, and the auxiliary electrode layer is reused as both a touch sensing electrode and a fingerprint recognition electrode; The touch module is arranged in the non-display area, and the touch module is a chip integrating touch function and fingerprint recognition function. The touch module includes a touch detection unit and a fingerprint recognition unit. The auxiliary electrode layer is connected to the touch detection unit and the fingerprint recognition unit respectively. The touch module is used to perform touch detection and fingerprint recognition by detecting the change in capacitance between the auxiliary electrode layer and the human body; The display panel further includes a first electrode layer, a pixel defining layer, an organic light-emitting layer, and a second electrode layer, the auxiliary electrode layer being disposed on the same layer as the first electrode layer, the pixel defining layer being located on surfaces of the first electrode layer and the auxiliary electrode layer, the organic light-emitting layer being disposed within an opening of the pixel defining layer, and the second electrode layer being disposed on a surface of the organic light-emitting layer facing away from the first electrode layer, a second via hole being formed in the pixel defining layer, the second via hole being filled with a conductive medium, and the auxiliary electrode layer being connected to the second electrode layer through the second via hole; The auxiliary electrode layer and the second electrode layer are connected to a negative electrode of a driving voltage, and the driving voltage charges the auxiliary electrode layer.

2. The display panel according to claim 1, wherein: The fingerprint recognition unit includes a capacitance detection circuit and a signal processing circuit. The capacitance detection circuit is connected to the auxiliary electrode layer and is used to detect the capacitance value of the auxiliary electrode layer. The signal processing circuit is connected to the capacitance detection circuit and is used to receive the capacitance value and process the capacitance value.

3. The display panel according to claim 2, wherein: The touch module also includes a switch unit, one end of which is connected to the auxiliary electrode layer, and the other end is connected to the touch detection unit. When the switch unit is closed, the switch unit processes the capacitance value of the auxiliary electrode layer and outputs a touch signal to the touch detection unit.

4. The display panel according to claim 1, wherein: The first electrode layer includes a plurality of first electrodes spaced apart from each other, and the auxiliary electrode layer includes auxiliary electrodes spaced apart from each other between the first electrodes.

5. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 4.

6. The display device according to claim 5, wherein: The display device includes a main control module, which is connected to the switch unit and is used to control the switch unit to be turned on when touch detection is performed.

7. A method for controlling a display panel, characterized in that: The display panel includes a first electrode layer, an auxiliary electrode layer, an organic light-emitting layer, and a second electrode layer. The first electrode layer is connected to a positive electrode of a driving voltage, and the auxiliary electrode layer and the second electrode layer are connected to a negative electrode of a driving voltage. The auxiliary electrode layer is reused as a touch sensing electrode and a fingerprint recognition electrode. The touch module is a chip integrating touch and fingerprint recognition functions. The display panel also includes a pixel defining layer, an organic light-emitting layer, and a second electrode layer. The auxiliary electrode layer is arranged on the same layer as the first electrode layer. The pixel defining layer is located on the surface of the first electrode layer and the auxiliary electrode layer. The organic light-emitting layer is arranged in an opening of the pixel defining layer, and the second electrode layer is arranged on the surface of the organic light-emitting layer facing away from the first electrode layer. A second via hole is opened in the pixel defining layer, and a conductive medium is filled in the second via hole. The auxiliary electrode layer is connected to the second electrode layer through the second via hole. The auxiliary electrode layer and the second electrode layer are connected to a negative electrode of a driving voltage, and the driving voltage charges the auxiliary electrode layer. The method comprises the following steps: detecting a state of the display panel; obtaining a capacitance value of the auxiliary electrode layer; When detecting that the display panel is in a locked state, constructing a fingerprint image according to the capacitance value; Matching the fingerprint image with a preset image, if the similarity reaches a preset value, the match is successful, otherwise the match fails; When detecting that the display panel is in a touch state, generating a touch signal according to the capacitance value; Respond to the touch operation according to the touch signal.

Images