Display panel and display equipment

Abstract

The embodiment of the invention discloses a display panel and display equipment, a first cathode power line is connected with the cathodes of a plurality of light emitting devices in a fingerprint identification area, a second cathode power line is disconnected from the first cathode power line, and the second cathode power line is connected with the cathodes of a plurality of light emitting devices in a non-fingerprint identification area; the fingerprint identification judgment module is configured to judge whether a fingerprint identification mode is started or not, and if yes, a first control signal is sent; the circuit selection module is configured to input a first voltage to the first cathode power line according to a first control signal so as to enable the fingerprint identification area to have first set brightness; the power supply module is configured to input a second voltage to the second cathode power line so that the non-fingerprint identification area has a second set brightness, and the first set brightness is greater than the second set brightness. According to the embodiment of the invention, the cathode power line is divided into two blocks, so that the situation that cathode voltages influence each other when the fingerprint identification area works in the prior art is avoided.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly relates to a display panel and a display device. Background Art

[0002] As one of the mainstream application scenarios at the whole machine end currently, the under-screen optical fingerprint unlocking technology is favored by users for its high convenience and efficiency. This technology uses a light source under the screen to illuminate the finger and captures the user's fingerprint through a high-resolution sensor. The system determines whether to unlock the screen by comparing the stored fingerprint image data.

[0003] During the research and practice of the prior art, the inventors of the present application found that in the fingerprint recognition mode, the brightness of the fingerprint recognition area should be higher than the normal display brightness of the entire display area to better complete fingerprint recognition. However, since the cathode traces of the fingerprint recognition area and the entire display area are connected and the two areas are connected to the same cathode voltage, the brightness of the fingerprint recognition area is affected by the display of the entire display area, and the brightness of the fingerprint recognition area cannot be accurately controlled.

[0004] Especially in the low-brightness display scenario, the cathode voltage value in the low-brightness display scenario is smaller than that in the high-brightness display scenario, making the brightness of the fingerprint recognition area in the low-brightness display scenario unable to reach the brightness of the fingerprint recognition area in the high-brightness display scenario, resulting in a decrease in the accuracy of fingerprint recognition. Summary of the Invention

[0005] Embodiments of the present application provide a display panel and a display device, which can improve the accuracy of fingerprint recognition.

[0006] Embodiments of the present application provide a display panel, including a display area, the display area includes a fingerprint recognition area and a non-fingerprint recognition area, the non-fingerprint recognition area is located on at least one side of the fingerprint recognition area, and the display panel includes:

[0007] A first cathode power line and a second cathode power line, the first cathode power line is connected to the cathodes of a plurality of light-emitting devices in the fingerprint recognition area, the second cathode power line is disconnected from the first cathode power line, and the second cathode power line is connected to the cathodes of a plurality of light-emitting devices in the non-fingerprint recognition area;

[0008] A fingerprint recognition determination module, configured to determine whether to enable the fingerprint recognition mode. If so, it sends a first control signal and a second control signal;

[0009] A circuit selection module, configured to input a first voltage to the first cathode power line according to the first control signal so that the fingerprint recognition area has a first set brightness;

[0010] The power supply module is configured to input a second voltage to the second cathode power line so that the non-fingerprint recognition area has a second set brightness, and the first set brightness is greater than the second set brightness.

[0011] In some embodiments of the present application, the circuit selection module includes a first thin-film transistor and a second thin-film transistor. The first thin-film transistor is one of an N-type transistor and a P-type transistor, and the second thin-film transistor is the other of the N-type transistor and the P-type transistor;

[0012] The gates of the first thin-film transistor and the second thin-film transistor are connected to the same output terminal of the fingerprint recognition determination module. The input terminal of the first thin-film transistor is connected to a first power supply terminal, and the first power supply terminal is configured to provide the first voltage. The input terminal of the second thin-film transistor is connected to the power supply module, and the power supply module is configured to provide the second voltage. The output terminals of the first thin-film transistor and the second thin-film transistor are both connected to the first cathode power line, and the power supply module is also connected to the second cathode power line.

[0013] In some embodiments of the present application, in the fingerprint recognition mode, the gates of the first thin-film transistor and the second thin-film transistor are both connected to the first control signal. The first thin-film transistor is turned on, and the second thin-film transistor is turned off.

[0014] In some embodiments of the present application, the fingerprint recognition determination module is further configured to determine whether to enable the fingerprint recognition mode. If not, a second control signal is sent;

[0015] The circuit selection module is further configured to form a path between the power supply module and the first cathode power line according to the second control signal;

[0016] The power supply module is further configured to input the second voltage to both the first cathode power line and the second cathode power line simultaneously.

[0017] In some embodiments of the present application, in the non-fingerprint recognition mode, the gates of the first thin-film transistor and the second thin-film transistor are both connected to the second control signal. The first thin-film transistor is turned off, and the second thin-film transistor is turned on.

[0018] In some embodiments of the present application, in the fingerprint recognition mode, both the first voltage and the second voltage are negative voltages, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

[0019] In some embodiments of the present application, the first set brightness is greater than or equal to 1400 nits.

[0020] In some embodiments of the present application, the display panel further includes a display integrated chip, and both the fingerprint recognition determination module and the first power terminal are integrated in the display integrated chip.

[0021] In some embodiments of the present application, the display integrated chip and the circuit selection module are disposed in the bending area of the display panel.

[0022] In some embodiments of the present application, the fingerprint recognition determination module includes a digital-to-analog converter and a voltage comparator. The first input terminal of the voltage comparator is connected to the output terminal of the digital-to-analog converter, the second input terminal of the voltage comparator is connected to a reference voltage terminal, the output terminal of the voltage comparator is connected to the gates of the first thin-film transistor and the second thin-film transistor, and the input terminal of the digital-to-analog converter is configured to receive a digital signal.

[0023] Correspondingly, an embodiment of the present application further provides a display device, which includes the display panel described in any one of the above embodiments.

[0024] The display panel and the display device according to the embodiments of the present application both include a first cathode power line and a second cathode power line. The first cathode power line is connected to the cathodes of a plurality of light-emitting devices in the fingerprint recognition area, the second cathode power line is disposed disconnected from the first cathode power line, and the second cathode power line is connected to the cathodes of a plurality of light-emitting devices in the non-fingerprint recognition area; the fingerprint recognition determination module is configured to determine whether to enable the fingerprint recognition mode. If so, a first control signal is sent; the circuit selection module is configured to input a first voltage to the first cathode power line according to the first control signal so that the fingerprint recognition area has a first set brightness; the power module is configured to input a second voltage to the second cathode power line so that the non-fingerprint recognition area has a second set brightness, and the first set brightness is greater than the second set brightness.

[0025] It can be understood that in the embodiments of the present application, the cathode power line connected across the entire surface is split into two blocks, that is, the first cathode power line is connected to the light-emitting devices in the fingerprint recognition area, and the second cathode power line is connected to the light-emitting devices in the non-fingerprint recognition area, so that the fingerprint recognition area and the non-fingerprint recognition area are independently connected to the cathode voltage, avoiding the situation where the cathode voltages affect each other during the operation of the fingerprint recognition area in the prior art; secondly, in the embodiments of the present application, by controlling the input voltage of the cathode power line, compared with controlling the input voltage of the anode power line, the dynamic power consumption can be reduced and the risk of signal interference can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the module connection structure of the display panel provided by the embodiment of the present application;

[0027] Figure 2 is a schematic structural diagram of a display panel provided by an embodiment of the present application;

[0028] Figure 3 is a schematic structural diagram of a display device provided by an embodiment of the present application. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the embodiments can be combined with each other without further elaboration, and in the case of no contrary description, the orientation terms such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; and "inside" and "outside" refer to the outline of the device; the terms "first", "second", "third", etc. are only used as labels and do not impose numerical requirements or establish an order.

[0030] An embodiment of the present application provides a display panel and a display device, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments.

[0031] Please refer to Figure 1 and Figure 2 , an embodiment of the present application provides a display panel 100, which includes a display area AA. The display area AA includes a fingerprint recognition area A1 and a non-fingerprint recognition area A2. The non-fingerprint recognition area A2 is located on at least one side of the fingerprint recognition area A1.

[0032] The display panel 100 includes a first cathode power line VSS1, a second cathode power line VSS2, a fingerprint recognition determination module 11, a circuit selection module 12, and a power module 13.

[0033] The first cathode power line VSS1 is connected to the cathodes of a plurality of light-emitting devices in the fingerprint recognition area A1. The second cathode power line VSS2 is connected to the cathodes of a plurality of light-emitting devices in the non-fingerprint recognition area A2. The second cathode power line VSS2 is disconnected from the first cathode power line VSS1.

[0034] The fingerprint recognition determination module 11 is configured to determine whether to enable the fingerprint recognition mode. If so, it sends a first control signal and a second control signal. The circuit selection module 12 is configured to input a first voltage to the first cathode power line VSS1 according to the first control signal to make the fingerprint recognition area A1 have a first set brightness. The power supply module 13 is configured to input a second voltage to the second cathode power line VSS2 to make the non-fingerprint recognition area A2 have a second set brightness, and the first set brightness is greater than the second set brightness.

[0035] That is to say, in the fingerprint recognition mode, the circuit selection module 12 inputs a first voltage to the first cathode power line VSS1 to make the fingerprint recognition area A1 have a first set brightness, and the power supply module 13 inputs a second voltage to the second cathode power line VSS2 to make the non-fingerprint recognition area A2 have a second set brightness.

[0036] Optionally, the first cathode power supply trace VSS1 is arranged in the fingerprint recognition area A1, and the second cathode power supply trace VSS2 is arranged in the non-fingerprint recognition area A2.

[0037] It can be understood that in the embodiment of the present application, the cathode power line connected as a whole surface is split into two blocks. That is, the first cathode power line VSS1 is connected to the light-emitting devices in the fingerprint recognition area A1, and the second cathode power line VSS2 is connected to the light-emitting devices in the non-fingerprint recognition area A2, so that the fingerprint recognition area A1 and the non-fingerprint recognition area A2 are independently connected to the cathode voltage, avoiding the situation that the cathode voltages affect each other when the fingerprint recognition area works in the prior art. Secondly, the embodiment of the present application adopts the method of separately and independently controlling the input voltage of the cathode power line. Compared with separately and independently controlling the input voltage of the anode power line, it can reduce the dynamic power consumption and the risk of signal interference.

[0038] It can be understood that the voltage accessed by the anode power line is the VDD voltage, and the VDD voltage is a high-level voltage. If the anode power line is divided into two independent blocks corresponding to the fingerprint recognition area and the non-fingerprint recognition area, a large dynamic power consumption will be generated when switching between the fingerprint recognition mode and the non-fingerprint recognition mode. And the cathode power line accesses the VSS voltage signal, and the voltage swing of the VSS voltage signal is usually 30%-50% smaller than that of the VDD voltage signal, so the dynamic power consumption can be reduced.

[0039] For example, if the brightness of the fingerprint recognition area needs to be doubled, the VDD scheme needs to increase the VDD voltage from 3.8V to 4.5V (ΔV = 0.7V), while the embodiment of the present application only needs to adjust the VSS voltage from 0V to -0.5V (ΔV = 0.5V). The dynamic power consumption ratio P_VSS / P_VDD = (0.5V)2 / (0.7V)2 ≈ 51%, that is, the dynamic power consumption is reduced by about 49%.

[0040] Secondly, since the VDD voltage signal is at a high-level voltage, it will generate significant electromagnetic interference during the switching between fingerprint recognition and non-fingerprint recognition modes, affecting the stability of the display panel and peripheral circuits. In contrast, the embodiment of the present application switches the VSS voltage signal, which is a low-level voltage and operates at a low frequency during switching, so the degree of electromagnetic interference generated is relatively low, thereby reducing the risk of signal interference.

[0041] In addition, in the fingerprint recognition mode, the brightness of the fingerprint recognition area A1 is relatively high. In the VDD solution, the VDD voltage needs to be increased to a relatively high level, which will accelerate the aging of organic materials and shorten the lifespan of the OLED light-emitting device. However, in the embodiment of the present application, by adjusting the VSS voltage signal of the cathode power line, the electrical stress impact on the light-emitting layer caused by high voltage can be avoided, thereby improving the service life.

[0042] Optionally, the power supply module 13 is a power management unit (PMIC).

[0043] It should be noted that the first voltage refers to the voltage provided to the first cathode power line VSS1, and the second voltage refers to the voltage provided to the second cathode power line VSS2. The first set brightness refers to the brightness used for fingerprint recognition, and the first set brightness can be set according to the actual situation. The second set brightness refers to the set display brightness of the non-fingerprint recognition area A2. The set display brightness can be determined by video source data.

[0044] In some embodiments of the present application, in the fingerprint recognition mode, both the first voltage and the second voltage are negative voltages, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

[0045] It can be understood that the light-emitting brightness of the light-emitting device is related to the voltage difference between the anode and the cathode. The larger the voltage difference, the greater the electric field strength, the higher the recombination efficiency of electrons and holes in the light-emitting layer, and the greater the brightness. Therefore, when the voltage applied to the anode remains unchanged, the larger the absolute value of the first voltage, the larger the voltage difference across the light-emitting layer, and the greater the light-emitting brightness. Secondly, the negative value of the first voltage can provide more electrons to the light-emitting layer, improving the recombination efficiency of electrons and holes and further increasing the light-emitting brightness.

[0046] For example, in the display module of the comparative example, the cathode power supply lines of the entire display area are connected to the same VSS voltage signal. In the fingerprint recognition mode of the high-brightness display scenario, the brightness of the non-fingerprint recognition area is 500 nits (nit), and the brightness of the fingerprint recognition area is 1400 nits. The corresponding VSS voltage is -2.0 volts. In the fingerprint recognition mode of the low-brightness display scenario, the brightness of the non-fingerprint recognition area is 60 nits (nit), and the brightness of the fingerprint recognition area is 1173 nits. The corresponding VSS voltage is -1.0 volts. Obviously, in the low-brightness display scenario, the brightness of the fingerprint recognition area has decreased by 227 nits compared to the high-brightness scenario.

[0047] As shown in Table 1, Table 1 is a brightness table of the fingerprint recognition area A1 measured by setting different voltage values of the first voltage when the brightness of the non-fingerprint recognition area A2 in the embodiment of the present application is 60 nits.

[0048] Voltage value of the first voltage (V) -1.0 -1.3 -1.5 -2.0 Brightness of the fingerprint recognition area A1 (nit) 1173 1266 1316 1404 Brightness difference from 1400 nit (nit) 227 134 84 4

[0049] According to Table 1, as the absolute value of the first voltage increases, the brightness of the fingerprint recognition area A1 becomes greater. When the first voltage is -2.0 volts, the brightness of the fingerprint recognition area A1 is 1404 nits, which is basically close to the brightness of the fingerprint recognition area in the high-brightness display scenario of the comparative example.

[0050] Therefore, when the anode voltages connected to the fingerprint recognition area A1 and the non-fingerprint recognition area A2 are the same, in the fingerprint recognition mode, both the first voltage and the second voltage are negative voltages, and the absolute value of the first voltage is greater than the absolute value of the second voltage, so that the light-emitting brightness of the fingerprint recognition area A1 is greater than that of the non-fingerprint recognition area A2, thereby improving the accuracy of fingerprint recognition.

[0051] In some embodiments of the present application, the first set brightness is greater than or equal to 1400 nits.

[0052] It can be understood that setting the first brightness to be greater than or equal to 1400 nits can better improve the accuracy of fingerprint recognition. Optionally, the first set brightness is 1400 nits, 1500 nits, 1600 nits, 1700 nits, or 1800 nits, etc.

[0053] In some embodiments, the first set brightness can also be less than 1400 nits, for example, between 1000 nits and 1400 nits.

[0054] It should be noted that the brightness value of the first set brightness can be set according to the actual situation.

[0055] In some embodiments of the present application, the fingerprint recognition determination module 11 includes a digital-to-analog converter 111 and a voltage comparator 112. The first input terminal of the voltage comparator 112 is connected to the output terminal of the digital-to-analog converter 111, the second input terminal of the voltage comparator 112 is connected to the reference voltage terminal, the output terminal of the voltage comparator 112 is connected to the gates of the first thin-film transistor T1 and the second thin-film transistor T2, and the input terminal of the digital-to-analog converter 111 is configured to receive a digital signal.

[0056] It should be noted that when the analog voltage signal output by the digital-to-analog converter 111 is greater than the reference voltage of the reference voltage terminal, the voltage comparator 112 outputs the first control signal; when the analog voltage signal output by the digital-to-analog converter 111 is less than the reference voltage of the reference voltage terminal, the voltage comparator 112 outputs the second control signal.

[0057] In some embodiments of the present application, the circuit selection module 12 includes a first thin-film transistor T1 and a second thin-film transistor T2. The first thin-film transistor T1 is one of an N-type transistor and a P-type transistor, and the second thin-film transistor T2 is the other of an N-type transistor and a P-type transistor.

[0058] It can be understood that if the first thin-film transistor T1 is an N-type transistor, then the second thin-film transistor T2 is a P-type transistor. If the first thin-film transistor T1 is a P-type transistor, then the second thin-film transistor T2 is an N-type transistor.

[0059] Optionally, the gates of the first thin-film transistor T1 and the second thin-film transistor T2 are connected to the same output terminal of the fingerprint recognition determination module 11. The input terminal of the first thin-film transistor T1 is connected to the first power supply terminal V1, and the first power supply terminal V1 is configured to provide the first voltage. The input terminal of the second thin-film transistor T2 is connected to the power supply module 13, and the power supply module 13 is configured to provide the second voltage. The output terminals of the first thin-film transistor T1 and the second thin-film transistor T2 are both connected to the first cathode power line VSS1. The power supply module 13 is also connected to the second cathode power line VSS2.

[0060] In some embodiments of the present application, in the fingerprint recognition mode, the gates of the first thin-film transistor T1 and the second thin-film transistor T2 are both connected to the first control signal, the first thin-film transistor T1 is turned on, and the second thin-film transistor T2 is turned off.

[0061] In some embodiments of the present application, the fingerprint recognition determination module 11 is further configured to determine whether to enable the fingerprint recognition mode. If not, a second control signal is sent. The circuit selection module 12 is further configured to form a path between the power supply module 13 and the first cathode power line VSS1 according to the second control signal. The power supply module 13 is further configured to input the second voltage to both the first cathode power line VSS1 and the second cathode power line VSS2 simultaneously.

[0062] In some embodiments of the present application, in the non-fingerprint recognition mode, the gates of the first thin-film transistor T1 and the second thin-film transistor T2 are both connected to the second control signal. The first thin-film transistor T1 is turned off, and the second thin-film transistor T2 is turned on.

[0063] It can be understood that the circuit selection module 12 of the embodiments of the present application can control the conduction and cutoff of two paths simultaneously according to only one control signal, which simplifies the circuit structure and facilitates the switching between the fingerprint recognition mode and the non-fingerprint recognition mode.

[0064] In the embodiments of the present application, the first thin-film transistor T1 is a P-type transistor, and the second thin-film transistor T2 is an N-type transistor as an example for illustration.

[0065] In the fingerprint recognition mode, the fingerprint recognition determination module 11 outputs a low-level signal. The first thin-film transistor T1 is turned on, and the second thin-film transistor T2 is turned off. The first power supply terminal V1 outputs the first voltage to the first cathode power line VSS1; the power supply module 13 outputs the second voltage to the second cathode power line VSS2.

[0066] In the non-fingerprint recognition mode, the fingerprint recognition determination module 11 outputs a high-level signal. The first thin-film transistor T1 is turned off, and the second thin-film transistor T2 is turned on. The power supply module 13 outputs the second voltage to the first cathode power line VSS1 and the second cathode power line VSS2.

[0067] In some embodiments of the present application, the display panel 100 further includes a display integrated chip 10. The fingerprint recognition determination module 11 and the first power supply terminal V1 are both integrated in the display integrated chip 10.

[0068] It can be understood that integrating the fingerprint recognition determination module 11 and the first power supply terminal V1 in the display integrated chip 10 can save the layout area of the circuit. Also, based on the integration of the first power supply terminal V1 in the display integrated chip 10, the display integrated chip 10 provides the first voltage to the first cathode power line VSS1.

[0069] In some embodiments of the present application, the display integrated chip 10 and the circuit selection module 12 are arranged in the bending area W1 of the display panel 100.

[0070] It can be understood that both the display integrated chip 10 and the circuit selection module 12 are disposed in the bending area W1 of the display panel 100. By utilizing the bending feature of the bending area W1, the display integrated chip 10 and the circuit selection module 12 are bent to the back of the display panel 100, thereby avoiding an increase in the width of the border.

[0071] Please refer to Figure 3 , correspondingly, an embodiment of the present application further provides a display device 1000, which includes the display panel 100 described in any one of the above embodiments.

[0072] It should be noted that the structure of the display panel 100 of the display device 1000 in the embodiment of the present application is similar to or the same as the structure of the display panel 100 in any one of the above embodiments. Specifically, reference can be made to Figure 1 and Figure 2 for the elaboration, so it will not be repeated here.

[0073] The display device 1000 in the embodiment of the present application includes a first cathode power line VSS1 and a second cathode power line VSS2. The first cathode power line VSS1 is connected to the cathodes of a plurality of light-emitting devices in the fingerprint recognition area A1, and the second cathode power line VSS2 is disposed disconnected from the first cathode power line VSS1. The second cathode power line VSS2 is connected to the cathodes of a plurality of light-emitting devices in the non-fingerprint recognition area A2. The fingerprint recognition determination module 11 is configured to determine whether to enable the fingerprint recognition mode. If so, a first control signal is sent. The circuit selection module 12 is configured to input a first voltage to the first cathode power line VSS1 according to the first control signal so that the fingerprint recognition area A1 has a first set brightness. The power supply module 13 is configured to input a second voltage to the second cathode power line VSS2 so that the non-fingerprint recognition area A2 has a second set brightness, and the first set brightness is greater than the second set brightness.

[0074] That is to say, in the fingerprint recognition mode, the circuit selection module 12 inputs a first voltage to the first cathode power line VSS1 so that the fingerprint recognition area A1 has a first set brightness, and the power supply module 13 inputs a second voltage to the second cathode power line VSS2 so that the non-fingerprint recognition area A2 has a second set brightness.

[0075] It can be understood that in the embodiment of the present application, the cathode power line connected to the entire surface is split into two blocks, that is, the first cathode power line VSS1 is connected to the light-emitting devices in the fingerprint recognition area A1, and the second cathode power line VSS2 is connected to the light-emitting devices in the non-fingerprint recognition area A2, so that the fingerprint recognition area A1 and the non-fingerprint recognition area A2 are independently connected to the cathode voltage, avoiding the mutual influence of the cathode voltages generated during the operation of the fingerprint recognition area in the prior art. Secondly, the embodiment of the present application adopts a method of separately and independently controlling the input voltage of the cathode power line. Compared with separately and independently controlling the input voltage of the anode power line, it can reduce the dynamic power consumption and the risk of signal interference.

[0076] The above has introduced in detail a display panel and a display device provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A display panel, comprising a display area, wherein the display area comprises a fingerprint recognition area and a non-fingerprint recognition area, wherein the non-fingerprint recognition area is located on at least one side of the fingerprint recognition area, wherein: The display panel comprises: a first cathode power line and a second cathode power line, wherein the first cathode power line is connected to cathodes of a plurality of light-emitting devices in the fingerprint recognition area, and the second cathode power line is disconnected from the first cathode power line and connected to cathodes of a plurality of light-emitting devices in the non-fingerprint recognition area; A fingerprint recognition determination module is configured to determine whether to enable the fingerprint recognition mode, and if so, send a first control signal; a circuit selection module configured to input a first voltage to the first cathode power line according to the first control signal so that the fingerprint recognition area has a first set brightness; and The power module is configured to input a second voltage to the second cathode power line so that the non-fingerprint recognition area has a second set brightness, and the first set brightness is greater than the second set brightness.

2. The display panel according to claim 1, characterized in that: The circuit selection module includes a first thin film transistor and a second thin film transistor, the first thin film transistor is one of an N-type transistor and a P-type transistor, and the second thin film transistor is the other of the N-type transistor and the P-type transistor; The gate of the first thin film transistor and the gate of the second thin film transistor are connected to the same output terminal of the fingerprint identification and determination module, the input terminal of the first thin film transistor is connected to the first power supply terminal, the first power supply terminal is configured to provide the first voltage, the input terminal of the second thin film transistor is connected to the power supply module, the power supply module is configured to provide the second voltage, the output terminal of the first thin film transistor and the output terminal of the second thin film transistor are both connected to the first cathode power line, and the power supply module is also connected to the second cathode power line.

3. The display panel according to claim 2, characterized in that: In the fingerprint recognition mode, the gate of the first thin film transistor and the gate of the second thin film transistor are both connected to the first control signal, the first thin film transistor is turned on, and the second thin film transistor is turned off.

4. The display panel according to claim 3, characterized in that: The fingerprint recognition determination module is further configured to determine whether to turn on the fingerprint recognition mode, and if not, send a second control signal; The circuit selection module is further configured to enable the power module and the first cathode power line to form a path according to the second control signal; The power module is further configured to input the second voltage to the first cathode power line and the second cathode power line simultaneously.

5. The display panel according to claim 4, characterized in that: In the non-fingerprint recognition mode, the gate of the first thin film transistor and the gate of the second thin film transistor are both connected to the second control signal, the first thin film transistor is turned off, and the second thin film transistor is turned on.

6. The display panel according to any one of claims 1 to 5, characterized in that: In the fingerprint recognition mode, the first voltage and the second voltage are both negative voltages, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

7. The display panel according to any one of claims 1 to 5, characterized in that: The first set brightness is greater than or equal to 1400 nits.

8. The display panel according to any one of claims 2 to 5, characterized in that: The display panel also includes a display integrated chip, and the fingerprint identification and determination module and the first power supply terminal are both integrated in the display integrated chip.

9. The display panel according to claim 8, characterized in that: The display integrated chip and the circuit selection module are arranged in a bending area of ​​the display panel.

10. The display panel according to claim 8, characterized in that: The fingerprint identification and determination module includes a digital-to-analog converter and a voltage comparator, wherein a first input terminal of the voltage comparator is connected to an output terminal of the digital-to-analog converter, a second input terminal of the voltage comparator is connected to a reference voltage terminal, an output terminal of the voltage comparator is connected to a gate of the first thin film transistor and a gate of the second thin film transistor, and an input terminal of the digital-to-analog converter is configured to receive a digital signal.

11. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-10.

Images