Display screen, display module and electronic equipment

Abstract

The invention discloses a display screen, a display module and electronic equipment. The display screen comprises a display pixel circuit and a controller. The display pixel circuit includes a first display pixel circuit and a second display pixel circuit. Within each frame of scanning time of the display screen, when any current scanning line in a plurality of current scanning lines is located in a non-display area, the controller controls an input voltage parameter value of a first display pixel circuit corresponding to the current scanning line located in the display area to be a first voltage; a reset current value of a photodiode in the first display pixel circuit is a first current value, and when the plurality of current scanning lines are all located in the display area, an input voltage parameter value of the second display pixel circuit corresponding to the plurality of current scanning lines is controlled to be a second voltage, the reset current value of the photodiode in the second display pixel circuit is a second current value, and the deviation between the second current value and the first current value is smaller than a preset threshold value. According to the invention, the problem of non-uniform brightness display of the display screen can be avoided.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display screen, a display module and an electronic device. Background Art

[0002] Currently, users pay more and more attention to the display effect of electronic devices, and screen contrast is an important indicator for evaluating the display effect.

[0003] The prior art is to improve the screen contrast by resetting the anode of the photodiode in the display pixel circuit multiple times within one frame scanning time. However, due to the existence of the front and rear porch areas when the screen is driven, when the anode of the photodiode in the display pixel circuit is reset multiple times, one of the resets will fall into the front and rear porch areas and will not be actually driven on the screen. Therefore, this reset method will cause the problem of uneven screen brightness display. Summary of the invention

[0004] The present application provides a display screen, a display module and an electronic device, which can effectively avoid the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen, the display module and the electronic device.

[0005] In a first aspect, an embodiment of the present application provides a display screen, which includes a display pixel circuit and a controller. The display pixel circuit is arranged in an array in a display area of ​​the display screen, the display pixel circuit includes a photodiode, and the display pixel circuit includes a first display pixel circuit and a second display pixel circuit. During each frame scanning time of the display screen, the controller is used to control the input voltage parameter value of the first display pixel circuit to be a first voltage when any current scanning line among multiple current scanning lines is located in a non-display area, the reset current value of the photodiode in the first display pixel circuit is a first current value, the first display pixel circuit is a display pixel circuit corresponding to the current scanning line located in the display area, and when multiple current scanning lines are all located in the display area, the input voltage parameter value of the second display pixel circuit is controlled to be a second voltage, the reset current value of the photodiode in the second display pixel circuit is a second current value, the deviation between the second current value and the first current value is less than a preset threshold value, and the second display pixel circuit is a display pixel circuit corresponding to multiple current scanning lines.

[0006] In this embodiment, since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are located in the display area, the input voltage parameter value of the first display pixel circuit can be controlled differently from the input voltage parameter value of the second display pixel circuit, so that the deviation between the first current value and the second current value is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen.

[0007] In combination with the first aspect, in a first possible implementation, the display pixel circuit also includes a reset switch tube and an initial voltage input terminal, and the initial voltage input terminal is connected to the anode of the photodiode through the reset switch tube; the input voltage parameter value of the display pixel circuit is the anode voltage value of the photodiode.

[0008] In this embodiment, the display screen controls the reset current value of the photodiode by controlling the anode voltage value of the photodiode, so that the deviation between the first current value and the second current value is smaller than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen.

[0009] In combination with the first possible implementation manner of the first aspect, in a second possible implementation manner, the controller is used to control the voltage value of the initial voltage input terminal of the first display pixel circuit to be the first voltage when any current scanning line in the current scanning line is located in the non-display area, and control the reset switch tube of the first display pixel circuit to be turned on; when multiple current scanning lines are all located in the display area, control the voltage value of the initial voltage input terminal of the second display pixel circuit to be the second voltage, and control the reset switch tube of the second display pixel circuit to be turned on.

[0010] In combination with the first aspect, in a third possible implementation, the display pixel circuit also includes a reset switch tube and an initial voltage input terminal, and the initial voltage input terminal is connected to the cathode of the photodiode through the reset switch tube; the input voltage parameter value of the display pixel circuit is the cathode voltage value of the photodiode.

[0011] In this embodiment, the display screen controls the reset current value of the photodiode by controlling the cathode voltage value of the photodiode, so that the deviation between the first current value and the second current value is less than the preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen. In addition, the display screen has various ways to control the reset current value of the photodiode, and has high flexibility.

[0012] In combination with the third possible implementation of the first aspect, in a fourth possible implementation, the controller is used to, when any current scanning line in the current scanning lines is located in the non-display area, control the voltage value of the initial voltage input terminal of the first display pixel circuit to be the first voltage, and control the reset switch tube of the first display pixel circuit to be turned on; when multiple current scanning lines are all located in the display area, control the voltage value of the initial voltage input terminal of the second display pixel circuit to be the second voltage, and control the reset switch tube of the second display pixel circuit to be turned on.

[0013] In combination with the first aspect, in a fifth possible implementation, the display pixel circuit also includes a driving switch tube, a storage capacitor, a data transmission switch tube, a data input end and a power supply end, the first end of the driving switch tube is connected to the power supply end, the second end of the driving switch tube is connected to the anode of the photodiode, the control end of the driving switch tube is connected to the data input end through the data transmission switch tube, and the storage capacitor is connected between the first end of the driving switch tube and the control end; the input voltage parameter value of the display pixel circuit is the voltage value of the storage capacitor.

[0014] In this embodiment, the display screen controls the reset current value of the photodiode by controlling the voltage value of the storage capacitor, so that the deviation between the first current value and the second current value is less than the preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen. In addition, the display screen has various ways to control the reset current value of the photodiode, and has high flexibility.

[0015] In combination with the fifth possible implementation of the first aspect, in a sixth possible implementation, the controller is used to control the conduction duration of the data transmission switch tube in the first display pixel circuit to be a first duration, and the voltage value of the storage capacitor in the first display pixel circuit to be a first voltage when any current scanning line in the current scanning lines is located in the non-display area; when multiple current scanning lines are all located in the display area, the conduction duration of the data transmission switch tube in the second display pixel circuit is controlled to be a second duration, and the voltage value of the storage capacitor in the second display pixel circuit is a second voltage; when the voltage value of the storage capacitor is the first voltage or the second voltage, the switch tube is driven to be in the on state.

[0016] In combination with the first aspect, in a seventh possible implementation, the display pixel circuit also includes a data transmission switch tube, a driving switch tube, a data input terminal and a power supply terminal, wherein the first terminal of the driving switch tube is connected to the power supply terminal, the second terminal of the driving switch tube is connected to the anode of the photodiode, and the control terminal of the driving switch tube is connected to the data input terminal through the data transmission switch tube; the input voltage parameter value of the display pixel circuit is the control terminal voltage value of the driving switch tube.

[0017] In this embodiment, the display screen controls the reset current value of the photodiode by controlling the voltage value of the control terminal of the driving switch tube, so that the deviation between the first current value and the second current value is less than the preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen. In addition, the display screen has various ways to control the reset current value of the photodiode, which is highly flexible.

[0018] In combination with the seventh possible implementation of the first aspect, in an eighth possible implementation, the controller is used to, when any current scanning line in the current scanning lines is located in the non-display area, control the voltage value of the data input terminal of the first display pixel circuit to be a first voltage, and control the data transmission switch tube of the first display pixel circuit to be turned on; when multiple current scanning lines are all located in the display area, control the voltage value of the data input terminal of the second display pixel circuit to be a second voltage, and control the data transmission switch tube of the second display pixel circuit to be turned on, wherein the first voltage and the second voltage are both greater than the turn-on voltage threshold of the driving switch tube.

[0019] In combination with the first aspect, in a ninth possible implementation, the display pixel circuit also includes a data transmission switch tube, a driving switch tube, a data input terminal and a power supply terminal, wherein the first terminal of the driving switch tube is connected to the power supply terminal, the second terminal of the driving switch tube is connected to the anode of the photodiode, and the control terminal of the driving switch tube is connected to the data input terminal through the data transmission switch tube; the input voltage parameter value of the display pixel circuit is the control terminal voltage value of the data transmission switch tube.

[0020] In this embodiment, the display screen controls the reset current value of the photodiode by controlling the voltage value of the control terminal of the data transmission switch tube, so that the deviation between the first current value and the second current value is less than the preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen. In addition, the display screen has various ways to control the reset current value of the photodiode, and has high flexibility.

[0021] In combination with the ninth possible implementation of the first aspect, in a tenth possible implementation, the first voltage and the second voltage are both smaller than a turn-on voltage threshold of the data transmission switch tube.

[0022] In this embodiment, the display screen adjusts the magnitude of the current flowing out of the channel of the data transmission switch tube by adjusting the magnitude of the voltage value of the control terminal of the data transmission switch tube when the data transmission switch tube is in the off state, thereby adjusting the magnitude of the reset current value of the photodiode. Since the deviation between the second current value and the first current value is less than the preset threshold value, the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time can be avoided.

[0023] In combination with the ninth possible implementation of the first aspect, in an eleventh possible implementation, the first voltage and the second voltage are both greater than a turn-on voltage threshold of the data transmission switch tube.

[0024] In this embodiment, the display screen adjusts the control terminal voltage of the driving switch tube by adjusting the control terminal voltage of the data transmission switch tube when the data transmission switch tube is in the on state, thereby adjusting the reset current value of the photodiode. Since the deviation between the second current value and the first current value is less than the preset threshold value, the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time can be avoided.

[0025] In combination with the first aspect to the eleventh possible implementation of the first aspect, in a twelfth possible implementation, the display pixel circuit further includes a third display pixel circuit and a fourth display pixel circuit. During each frame scan time when the frame rate of the display screen is the first frame rate, the controller is used to control the input voltage parameter value of the first display pixel circuit to be the first voltage when any current scan line among the multiple current scan lines is located in the non-display area, and to control the input voltage parameter value of the second display pixel circuit to be the second voltage when the multiple current scan lines are all located in the display area. During each frame scan time after the frame rate of the display screen is switched from the first frame rate to the second frame rate, the controller is also used to control the input voltage parameter value of the third display pixel circuit to be the first voltage when any current scan line among the multiple current scan lines is located in the non-display area, the reset current value of the photodiode in the third display pixel circuit is the first current value, and the third display pixel circuit is the display pixel circuit corresponding to the current scan line located in the display area, and when the multiple current scan lines are all located in the display area, the input voltage parameter value of the fourth display pixel circuit is controlled to be the second voltage, the reset current value of the photodiode in the fourth display pixel circuit is the second current value, and the fourth display pixel circuit is the display pixel circuit corresponding to the multiple current scan lines.

[0026] In this embodiment, before and after the frame rate of the display screen is switched, the difference between the first current value and the second current value is always smaller than the preset threshold value. Therefore, regardless of whether the frame rate of the display screen is switched, the problem of uneven brightness display caused by multiple resets of the photodiode within each frame scanning time can be avoided.

[0027] In combination with the twelfth possible implementation manner of the first aspect, in the thirteenth possible implementation manner, the first frame rate and the second frame rate are any two preset frame rates among K preset frame rates, wherein K≥F*x-x+1, the i-th preset frame rate among the K preset frame rates is F*x / (x+i-1), i is a positive integer, F is the maximum frame rate of the display screen, and x is the number of multiple current scanning lines.

[0028] In this embodiment, the preset frame rate values ​​included in a set of Gamma of the display screen are more diverse than the preset frame rate values ​​included in a set of Gamma in the prior art, so that the display screen can complete frame rate switching within the same set of Gamma, thereby avoiding the problem of screen brightness and color flickering when the display screen switches the frame rate between different sets of Gamma, thereby improving the display effect of the display screen.

[0029] In a second aspect, an embodiment of the present application provides a display module, which includes a protective layer, an anti-fingerprint layer, and a display screen provided by any one of the first to thirteenth possible implementations of the first aspect. The protective layer is located on the first surface of the display screen, and the anti-fingerprint layer is located on the surface of the protective layer away from the display screen.

[0030] In this embodiment, since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are located in the display area, the input voltage parameter value of the first display pixel circuit can be controlled differently from the input voltage parameter value of the second display pixel circuit, so that the deviation between the first current value and the second current value is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display module.

[0031] In a third aspect, an embodiment of the present application provides an electronic device, which includes a housing and a display module provided in the third aspect connected to the housing.

[0032] In an embodiment of the present application, since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are all located in the display area, the input voltage parameter value of the first display pixel circuit can be controlled differently from the input voltage parameter value of the second display pixel circuit, so that the deviation between the first current value and the second current value is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time, thereby improving the screen display effect of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of an application scenario of an electronic device provided in an embodiment of the present application;

[0034] Figure 2 It is a scanning schematic diagram of resetting the anode of a photodiode three times within one frame scanning time provided by the prior art;

[0035] Figure 3 is a schematic diagram of the structure of a display screen provided in an embodiment of the present application;

[0036] Figure 4a is a structural schematic diagram of a display pixel circuit provided by an embodiment of the present application;

[0037] Figure 4b is another structural schematic diagram of a display pixel circuit provided in an embodiment of the present application;

[0038] Figure 5 It is a waveform diagram of input voltage parameters of a display pixel circuit before and after the display screen frame rate is switched according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] The display screen, display module and electronic device provided in this application are applicable to electronic devices with display screens, such as smart phones, tablet computers, desktop computers, televisions, printers, wearable devices, etc., and can be applied to the fields of electronic equipment, automobiles, and aerospace, etc. The following uses a smart phone as an example to illustrate the application scenarios of the electronic device.

[0040] See also Figure 1 , Figure 1 This is a schematic diagram of an application scenario of an electronic device provided in an embodiment of the present application. The electronic device provided in this application is suitable for Figure 1 The smart phone shown in (a) includes a display module 1 and a housing 2 connected to the display module 1. Figure 1As shown in (b), the display module 1 includes a display screen 11, a protective layer 12 and an anti-fingerprint layer 13. The protective layer 12 is located on the upper surface of the display screen 11 to protect the display screen 11. The anti-fingerprint layer 13 is located on the surface of the protective layer 12 away from the display screen 11 to improve the contact angle of the display module to prevent fingerprints from remaining on the surface of the display module. The display screen 11 includes a display pixel circuit, the number of which is n*m, and the n*m ​​display pixel circuits are arranged in the display area of ​​the display screen 11 in the form of n rows and m columns, and each display pixel circuit includes a photodiode.

[0041] When the smart phone is working normally, the controller in the display screen 11 controls the multiple scanning lines to scan the display screen 1 in order from top to bottom, and in each frame scanning time of the display screen 11, when any current scanning line among the multiple current scanning lines is located in the non-display area, the input voltage parameter value of the first display pixel circuit is controlled to be the first voltage, and the first display pixel circuit is the display pixel circuit corresponding to the current scanning line in the above n*m ​​display pixel circuits located in the display area. The controller also controls the input voltage parameter value of the second display pixel circuit to be the second voltage, and the second display pixel circuit is the display pixel circuit corresponding to the multiple current scanning lines in the above n*m ​​display pixel circuits, when the multiple current scanning lines are all located in the display area, so that the deviation between the reset current value of the photodiode in the first display pixel circuit and the reset current value of the photodiode in the second display pixel circuit is less than the preset threshold. Afterwards, after resetting the photodiode in the display pixel circuit of the current scanning row in the display area, the controller 21 controls the display pixel circuit of the current scanning row in the display area to write a data voltage, and controls the brightness of the photodiode in the display pixel current of the current scanning row in the display area based on the data voltage, thereby realizing the driving of the display screen 11.

[0042] It can be understood that since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are all located in the display area, the input voltage parameter value of the first display pixel circuit can be controlled differently from the input voltage parameter value of the second display pixel circuit, so that the deviation between the reset current value of the photodiode in the first display pixel circuit and the reset current value of the photodiode in the second display pixel circuit is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen 11 resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen 11, the display module 1 and the smart phone.

[0043] The above is only an example of the application scenarios of the electronic device provided by this application, and is not an exhaustive list. This application does not limit the application scenarios.

[0044] For ease of understanding, let's first combine Figure 2 Taking the case of resetting the anode of the photodiode three times within one frame scanning time as an example, the cause of uneven display brightness of the display screen is explained. Figures 3 to 5 The structure and working principle of the display screen provided in this application are illustrated by way of example.

[0045] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of scanning in which the anode of a photodiode is reset three times within one frame scanning time provided by the prior art. Figure 2 As shown in the figure, the driving area of ​​the display screen includes the display area and the front and rear porch areas. For example, the display area has 2520 lines and the front and rear porch areas have 60 lines. It can be considered that the display screen is driven according to 2580 lines. Assuming that the photodiode is reset three times and the time intervals of the three resets are equal, the time intervals of the three resets are 2580 / 3=860 lines corresponding to the scanning time. When the display screen starts to be scanned, Figure 2 As shown in (a) of FIG. 1 , the first scanning line of the three scanning lines of the display screen starts scanning downward from the first line in the display area, the second scanning line starts scanning downward from the position 860 lines below the first scanning line in the display area, and the third scanning line starts scanning downward from the position 860 lines below the second scanning line in the display area. After the scanning time corresponding to 800 lines has passed, as shown in FIG. Figure 2 As shown in (b) in the figure, the third scan line enters the front and back porch area from the display area, and in the subsequent 60 scan lines, the third scan line is always in the front and back porch area. Obviously, after the third scan line enters the front and back porch area, the number of rows of display pixel circuits that need to be reset changes from three to two. Since the reset voltage value of the photodiode is the same before and after the third scan line enters the front and back porch area, but the number of photodiodes that need to be reset is different, there will be Figure 2 The display screen shown in (b) shows uneven brightness. It should be noted that Figure 2 The example of uneven brightness display on the display screen when the number of rows of display pixel circuits that need to be reset changes from small to large is used for explanation. In fact, when the number of rows of display pixel circuits that need to be reset changes from large to small, the display screen will still have uneven brightness display.

[0046] Based on this, the present application provides a display screen, which can avoid the problem of uneven brightness display when the display screen resets the photodiode multiple times within each frame scanning time by controlling the input voltage parameter value of the display pixel circuit corresponding to the current scanning line located in the display area when any current scanning line among multiple current scanning lines is located in the front or rear porch area, which is different from the input voltage parameter value of the display pixel circuit corresponding to the current scanning line when multiple current scanning lines are all located in the display area.

[0047] See also Figure 3 , Figure 3 Schematic diagram of the structure of the display screen provided in the embodiment of the present application. Figure 3 As shown, the display screen 11 includes a controller 21 and a display pixel circuit. The number of the display pixel circuits is n*m, and the n*m ​​display pixel circuits correspond to Figure 3 The display pixel circuits 111, ..., display pixel circuit 11m; ...; display pixel circuit 1j1, ..., display pixel circuit 1jm; ...; display pixel circuit 1n1, ..., display pixel circuit 1nm are shown. n*m display pixel circuits are arranged in an array in the display area of ​​the display screen 11. Exemplarily, the n*m ​​display pixel circuits are arranged in the display area of ​​the display screen 11 in the form of n rows and m columns. Each display pixel circuit includes a photodiode.

[0048] In one embodiment, after the display screen 11 starts working, the controller 21 controls the multiple scanning lines to start scanning the display screen 11 in order from top to bottom. During each frame scanning time of the display screen 11, when any current scanning line among the multiple current scanning lines is located in the non-display area, that is, when the controller 21 is Figure 3 During the T2 time period shown, the input voltage parameter value Vin of the first display pixel circuit is controlled to be the first voltage V1, so that the reset current value of the photodiode of the first display pixel circuit is the first current value. Among them, the driving area when the display screen 11 is driven includes a display area and a non-display area. The non-display area can be a front and rear porch area. The front and rear porch areas do not contain display pixel circuits, and the screen is not displayed. The first display pixel circuit is a display pixel circuit corresponding to the current scan line located in the display area among the above-mentioned n*m display pixel circuits. The controller 21 also when multiple current scan lines are all located in the display area, that is, the controller 21 is still Figure 3In the T1 time period shown, the input voltage parameter value Vin of the second display pixel circuit is controlled to be the second voltage V2, so that the reset current value of the photodiode of the second display pixel circuit is the second current value. Wherein, the second display pixel circuit is a display pixel circuit corresponding to multiple current scanning rows in the above-mentioned n*m display pixel circuits, and the deviation between the second current value and the first current value is less than the preset threshold value. In addition, the display screen 11 provided in the present application realizes multiple resets of the photodiode within each frame scanning time by controlling the number of photodiode resets within each frame scanning time and the frame rate of the display screen 11 by two separate circuits. The number of multiple current scanning rows within each frame scanning time corresponds to the number of resets of the anode of the photodiode in the display pixel circuit within each frame scanning time. Exemplarily, when the number of multiple current scanning rows is 3, it means that the controller 21 resets the anode of the photodiode 3 times within each frame scanning time.

[0049] It should be noted that, as the display pixel circuit structure changes, the magnitude relationship between the first voltage and the second voltage will also change, such as the second voltage being greater than the first voltage. Based on this, the present application only limits the deviation between the first current value and the second current value to be less than a preset threshold, and does not limit the magnitude relationship between the first voltage and the second voltage.

[0050] In an embodiment of the present application, since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are all located in the display area, it is possible to control the input voltage parameter value of the first display pixel circuit and the input voltage parameter value of the second display pixel circuit differently so that the deviation between the reset current value of the photodiode in the first display pixel circuit and the reset current value of the photodiode in the second display pixel circuit is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen 11 resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display screen 11.

[0051] Since the circuit structures of the display pixel circuits in the display screen 11 are the same, the structure of the display pixel circuit and the working principle of the display screen are introduced below by taking the display pixel circuit 111 as an example.

[0052] Please also see Figure 4a , Figure 4a 1 is a schematic diagram of a display pixel circuit provided by an embodiment of the present application. Figure 4aAs shown, the display pixel circuit 111 includes a photodiode PD, a reset switch tube RTFT, a driving switch tube DTFT, a data transmission switch tube STFT, a storage capacitor Cst, an initial voltage input terminal int, a data input terminal data, a power supply terminal ELVDD and a power supply terminal ELVSS. Among them, the anode of the photodiode PD is connected to the initial voltage input terminal int through the reset switch tube RTFT. Specifically, the source and drain of the reset switch tube RTFT are respectively connected to the anode of the photodiode PD and the initial voltage input terminal int. The cathode of the photodiode PD is connected to the power supply terminal ELVSS. The source of the driving switch tube DTFT is connected to the power supply terminal ELVDD, and the drain of the driving switch tube DTFT is connected to the anode of the photodiode PD. The source of the data transmission switch tube STFT is connected to the data input terminal data, and the drain of the data transmission switch tube STFT is connected to the gate of the driving switch tube DTFT. The storage capacitor Cst is connected between the source and the gate of the driving switch tube DTFT. The initial voltage input terminal int, the data input terminal data, the power supply terminal ELVDD and the power supply terminal ELVSS are respectively connected to the voltages Vint, Vdata, VDD and VSS.

[0053] Among them, any of the reset switch tube RTFT, the drive switch tube DTFT and the data transmission switch tube STFT can be a low temperature polysilicon-thin film transistor (LTPS-TFT), an oxide TFT or a mixture of LTPS-TFT and oxide TFT. Since the source and drain of the oxide TFT are symmetrical, when any switch tube in the present application is connected, the source and drain of the oxide TFT can be used interchangeably. Exemplarily, the drain and source of the reset switch tube RTFT are respectively connected to the anode of the photodiode PD and the initial voltage input terminal int.

[0054] In one embodiment, during each frame scanning time of the display screen 11, when any current scanning row among the multiple current scanning rows is located in the non-display area, the controller 21 controls the input voltage parameter value of the first display pixel circuit to be the first voltage, wherein the first display pixel circuit is the display pixel circuit corresponding to the current scanning row located in the display area among the above n*m ​​display pixel circuits. The controller 21 also controls the input voltage parameter value of the second display pixel circuit to be the second voltage when the multiple current scanning rows are all located in the display area, wherein the second display pixel circuit is the display pixel circuit corresponding to the multiple current scanning rows among the above n*m ​​display pixel circuits. Thus, the deviation between the reset current value of the photodiode in the first display pixel circuit and the reset current value of the photodiode in the second display pixel circuit is less than a preset threshold. Among them, the input voltage parameter value of the display pixel circuit includes at least one of the anode voltage value of the photodiode PD in the display pixel circuit, the cathode voltage value of the photodiode PD, the voltage value of the storage capacitor Cst, the gate voltage value of the drive switch tube DTFT, and the gate voltage value of the data switch tube STFT.

[0055] In an optional embodiment, the input voltage parameter value of the display pixel circuit is the anode voltage value of the photodiode PD.

[0056] Specifically, during each frame scan time of the display screen 11, when any current scan line among the multiple current scan lines is located in the front and rear porch area, the controller 21 controls the voltage value of the initial voltage input terminal int in the first display pixel circuit to be the first voltage, and controls the reset switch tube RDTD of the first display pixel circuit to be turned on, so that the anode voltage value of the photodiode PD of the first display pixel circuit is the first voltage, and the reset current value of the photodiode PD when the anode voltage value of the photodiode PD is the first voltage is the first current value. The controller 21 also controls the voltage value of the initial voltage input terminal int in the second display pixel voltage to be the second voltage when the multiple current scan lines are all located in the display area, and controls the reset switch tube RTFT of the second display pixel circuit to be turned on, so that the anode voltage value of the photodiode PD of the second display pixel circuit is the second voltage, and the reset current value of the photodiode PD when the anode voltage value of the photodiode PD is the second voltage is the second current value, and the deviation between the second current value and the first current value is greater than the preset deviation. In addition, the problem of uneven brightness display when the display screen 11 resets the photodiode PD multiple times during each frame scan time can be avoided.

[0057] In another optional embodiment, the input voltage parameter value of the display pixel circuit is the voltage value of the storage capacitor Cst.

[0058] During each frame scan time of the display screen 11, when any current scan line among the multiple current scan lines is located in the front and rear porch area, the controller 21 controls the conduction time of the data transmission switch tube STFT of the first display pixel circuit to be the first time length, thereby charging the storage capacitor Cst, so that the voltage value of the storage capacitor Cst is the first voltage, and when the voltage value of the storage capacitor Cst is the first voltage, the switch tube DTFT is driven to be in a conducting state, and the reset current value of the photodiode is the first current value. The controller 21 also controls the conduction time of the data transmission switch tube STFT of the second display pixel circuit to be the second time length when the multiple current scan lines are all located in the display area, thereby charging the storage capacitor Cst, so that the voltage value of the storage capacitor Cst is the second voltage, and when the voltage value of the storage capacitor Cst is the second voltage, the switch tube DTFT is driven to be in a conducting state, and the reset current value of the photodiode is the second current value, and the deviation between the second current value and the first current value is less than the preset threshold value. In addition, the problem of uneven brightness display when the display screen 11 resets the photodiode PD multiple times during each frame scan time can be avoided.

[0059] In another optional embodiment, the input voltage parameter value of the display pixel circuit is the gate voltage value of the driving switch tube DTFT.

[0060] During each frame scan time of the display screen 11, when any current scan line among the multiple current scan lines is located in the front and rear corridor porch area, the controller 21 controls the voltage value of the data input terminal data of the first display pixel circuit to be the first voltage, and controls the data transmission switch tube STFT of the first display pixel circuit to be turned on, so that the gate voltage value of the driving switch tube DTFT in the first display pixel circuit is the first voltage, and the reset current value of the photodiode PD is the first current value when the gate voltage value of the driving switch tube DTFT is the first voltage. The controller 21 also controls the voltage value of the data input terminal data of the second display pixel circuit to be the second voltage when the multiple current scan lines are all located in the display area, and controls the data transmission switch tube STFT of the second display pixel circuit to be turned on, so that the gate voltage value of the driving switch tube DTFT of the second display pixel circuit is the second voltage, and the reset current value of the photodiode PD is the second current value when the gate voltage value of the driving switch tube DTFT is the second voltage, and the deviation between the second current value and the first current value is less than the preset threshold value. In addition, the problem of uneven brightness display when the display screen 11 resets the photodiode PD multiple times during each frame scan time can be avoided.

[0061] In another optional embodiment, the input voltage parameter value of the display pixel circuit is the gate voltage value of the data transmission switch tube STFT.

[0062] Specifically, during each frame scanning time of the display screen 11, when any current scanning line among the multiple current scanning lines is located in the front and rear porch area, the controller 21 controls the gate voltage value of the data transmission switch tube STFT of the first display pixel circuit to be a first voltage, the first voltage is less than the conduction voltage threshold of the data transmission switch tube STFT, and the reset current value of the photodiode is a first current value when the control terminal voltage value of the data transmission switch tube STFT is the first voltage. The controller 21 also controls the gate voltage value of the data transmission switch tube STFT of the second display pixel circuit to be a second voltage when the multiple current scanning lines are all located in the display area, the second voltage is less than the conduction voltage threshold of the data transmission switch tube STFT, and the reset current value of the photodiode is a second current value when the off voltage value of the data transmission switch tube STFT is the second voltage, and the deviation between the second current value and the first current value is less than the preset threshold. It can be understood that the display screen 11 adjusts the current flowing out of the channel of the data transmission switch tube STFT by adjusting the gate voltage value of the data transmission switch tube STFT when the data transmission switch tube STFT is in the off state, thereby adjusting the reset current value of the photodiode PD. Furthermore, since the deviation between the second current value and the first current value is smaller than the preset threshold value, the problem of uneven brightness display when the display screen 11 resets the photodiode PD multiple times within each frame scanning time can be avoided.

[0063] Optionally, during each frame scanning time of the display screen 11, when any current scanning line among the multiple current scanning lines is located in the front and rear porch areas, the controller 21 controls the gate voltage value of the data transmission switch tube STFT of the first display pixel circuit to be a first voltage, the first voltage is greater than the conduction voltage threshold of the data transmission switch tube STFT, and the reset current value of the photodiode is a first current value when the gate voltage value of the data transmission switch tube STFT is the first voltage. The controller 21 also controls the gate voltage value of the data transmission switch tube STFT of the second display pixel circuit to be a second voltage when the multiple current scanning lines are all located in the display area, the second voltage is greater than the conduction voltage threshold of the data transmission switch tube STFT, and the reset current value of the photodiode is a second current value when the turn-off voltage value of the data transmission switch tube STFT is the second voltage, and the deviation between the second current value and the first current value is less than the preset threshold. It can be understood that the display screen 11 adjusts the gate voltage value of the driving switch tube DTFT by adjusting the gate voltage value of the data transmission switch tube STFT when the data transmission switch tube STFT is in the on state, thereby adjusting the reset current value of the photodiode PD. Furthermore, since the deviation between the second current value and the first current value is smaller than the preset threshold value, the problem of uneven brightness display when the display screen 11 resets the photodiode PD multiple times within each frame scanning time can be avoided.

[0064] In yet another optional embodiment, the input voltage parameter value of the display pixel circuit is the cathode voltage value of the photodiode PD.

[0065] Optional, Figure 4a The reset switch tube RTFT shown can also be connected to the cathode of the photodiode PD. For details, please refer to Figure 4b The display pixel circuit shown in FIG. Figure 4b As shown, the cathode of the photodiode PD is connected to the initial voltage input terminal int through the reset switch tube RTFT. Specifically, the source and drain of the reset switch tube RTFT are connected to the cathode of the photodiode PD and the initial voltage input terminal int respectively.

[0066] During each frame scan time of the display screen 11, when any current scan line among the multiple current scan lines is located in the front and back porch area, the controller 21 controls the voltage value of the initial voltage input terminal int in the first display pixel circuit to be the first voltage, and controls the reset switch tube RDTD of the first display pixel circuit to be turned on, so that the cathode voltage value of the photodiode PD of the first display pixel circuit is the first voltage, and the anode voltage value of the photodiode PD is the first voltage when the reset current value of the photodiode PD is the first current value. The controller 21 also controls the voltage value of the initial voltage input terminal int in the second display pixel voltage to be the second voltage when the multiple current scan lines are all located in the display area, and controls the reset switch tube RTFT of the second display pixel circuit to be turned on, so that the cathode voltage value of the photodiode PD of the second display pixel circuit is the second voltage, and the anode voltage value of the photodiode PD is the second voltage when the reset current value of the photodiode PD is the second current value, and the deviation between the second current value and the first current value is greater than the preset deviation. In addition, the problem of uneven brightness display when the display screen 11 resets the photodiode PD multiple times during each frame scan time can be avoided.

[0067] Furthermore, the display screen 11 can also realize seamless switching between high and low frame rates by resetting the photodiode multiple times within each frame scanning time, thereby avoiding the problem of screen brightness and color flickering when switching frame rates between different sets of Gamma.

[0068] During each frame scanning time of the display screen 11 having a frame rate of the first frame rate, the controller 21 controls the input voltage parameter value of the first display pixel circuit to be the first voltage when any current scanning line among multiple current scanning lines is located in the non-display area, and controls the input voltage parameter value of the second display pixel circuit to be the second voltage when all multiple current scanning lines are located in the display area.

[0069] Afterwards, the controller 21 controls the frame rate of the display screen 11 to switch from the first frame rate to the second frame rate, and in each frame scanning time after the frame rate of the display screen switches from the first frame rate to the second frame rate, when any current scanning line among the multiple current scanning lines is located in the non-display area, the input voltage parameter value of the third display pixel circuit is controlled to be the first voltage, so that the reset current value of the photodiode in the third display pixel circuit is the first current value. Among them, the third display pixel circuit is the display pixel circuit corresponding to the current scanning line located in the display area among the above-mentioned n*m display pixel circuits. The controller 21 also controls the input voltage parameter value of the fourth display pixel circuit to be the second voltage when multiple current scanning lines are all located in the display area, so that the reset current value of the photodiode in the fourth display pixel circuit is the second current value. Among them, the fourth display pixel circuit is the display pixel circuit corresponding to multiple current scanning lines among the above-mentioned n*m display pixel circuits. Here, the specific control method of the input voltage parameter value of the display pixel circuit by the display screen 11 in each frame scanning time before and after the frame rate switching, please refer to the description of the above-mentioned embodiment, which will not be repeated here.

[0070] Among them, the first frame rate and the second frame rate are any two preset frame rates among K preset frame rates, K≥F*x-x+1, the i-th preset frame rate among the K preset frame rates is F*x / (x+i-1), i is a positive integer, F is the maximum frame rate of the display screen 11, and x is the number of multiple current scanning lines. It can be understood that the K preset frame rates are frame rates included in a set of Gamma. Since i is a positive integer, the number of frame rates that can be achieved in a set of Gamma provided in this application can be infinite.

[0071] For example, assuming that the maximum frame rate F of the display screen 11 is 120Hz, the number of resets of the photodiode within each frame scanning time is 3, that is, the number of multiple current scanning lines within each frame scanning time is 3, then the at least 358 preset frame rates contained in a set of Gamma of the display screen 11 are 120*3 / (3+1-1)=120Hz, 120*3 / (3+2-1)=90Hz, 120*3 / (3+3-1)=72Hz, 120*3 / (3+4-1)=60Hz, 120*3 / (3+5-1)=51.4Hz, ..., 120*3 / (3+358-1)=1Hz. For details, please refer to Figure 5 , Figure 5 is a waveform diagram of input voltage parameters of a display pixel circuit before and after the display screen frame rate is switched according to an embodiment of the present application. Figure 5 As shown, the frame rate of the display screen 11 can be any one of 120 Hz, 90 Hz, 72 Hz, 60 Hz, ..., 1 Hz. When the frame rate of the display screen 11 is 120 Hz, the three working cycles T of the display screen 11 constitute a frame scanning time when the frame rate of the display screen 11 is 120 Hz, that is, Figure 5 1-frame as shown. Among them, one working cycle T of the display screen 11 = T1 + T2, T1 represents the time period corresponding to when the three current scanning lines of the display screen 11 are all located in the display area, and T2 represents the time period corresponding to when any of the three current scanning lines of the display screen 11 is located in the front and back porch areas. When the frame rate of the display screen 11 is 90Hz, the four working cycles T of the display screen 11 constitute one frame scanning time of the display screen 11; when the frame rate of the display screen 11 is 72Hz, the five working cycles T of the display screen 11 constitute one frame scanning time of the display screen 11; when the frame rate of the display screen 11 is 60Hz, the six working cycles T of the display screen 11 constitute one frame scanning time of the display screen 11.

[0072] In addition, assuming that the first frame rate is 120 Hz, the second frame rate is 90 Hz, the frame rate of the display screen 11 is 120 Hz during the time period from t1 to t7, and the frame rate of the display screen 11 switches from 120 Hz to 90 Hz after time t7, then during the time period from t1 to t2, i.e., the time period corresponding to when the three current scanning lines of the display screen 11 are all located in the display area, the controller 21 controls the input voltage parameter value of the second display pixel circuit to be the second voltage V2. During the time period from t2 to t3, i.e., the time period corresponding to when any one of the three current scanning lines of the display screen 11 is located in the display area, the controller 21 controls the input voltage parameter value of the first display pixel circuit to be the first voltage V1. .... During the time period from t6 to t7, i.e., the time period corresponding to when any one of the three current scanning lines of the display screen 11 is located in the display area, the controller 21 controls the input voltage parameter value of the first display pixel circuit to be the first voltage V1. After time t7, the frame rate of the display screen 11 switches from 120 Hz to 90 Hz. In the time period from t7 to t8, i.e., the time period corresponding to when the three current scanning lines of the display screen 11 are all located in the display area, the controller 21 controls the input voltage parameter value of the fourth display pixel circuit to be the second voltage V2. In the time period from t8 to t9, i.e., the time period corresponding to when any of the three current scanning lines of the display screen 11 is located in the display area, the controller 21 controls the input voltage parameter value of the third display pixel circuit to be the first voltage V1.

[0073] Based on this, it can be known that the values ​​of the preset frame rates included in a set of Gamma of the display screen 11 are more diverse than the values ​​of the preset frame rates included in a set of Gamma in the prior art. For example, assuming that the maximum frame rate of the display screen 11 is 120Hz, the frame rates included in a set of Gamma in the prior art are 120Hz, 60Hz, 40Hz, 30Hz, 24Hz, 20Hz, ..., 1Hz. Obviously, a set of Gamma in the prior art does not include frame rates such as 90Hz and 72Hz. In addition, based on a set of Gamma in the prior art, if the frame rate of the display screen 11 is to be switched from 120Hz to 90Hz, the control timing output by the drive circuit to the display pixel circuit will change, and it is necessary to switch from the current set of Gamma containing 120Hz to another set of Gamma containing 72Hz, which will cause the brightness and color of the display screen 11 to flicker. The display screen 11 in the present application can provide a set of Gammas with more diverse preset frame rate values, so that the display screen 11 can complete frame rate switching within the same set of Gammas, thereby avoiding the problem of screen brightness and color flickering when the display screen 11 switches the frame rate between different sets of Gammas, thereby improving the display effect of the display screen 11.

[0074] based on Figure 3 The display screen 11 shown, and Figure 4a or Figure 4b The display pixel circuit shown in the figure, the present application also provides a display module, the display module includes a display screen 11, a protective layer and an anti-fingerprint layer. The protective layer is located on the upper surface of the display screen 11, and is used to protect the display screen 11. The anti-fingerprint layer is located on the surface of the protective layer away from the display screen 11, and is used to improve the contact angle of the display module to prevent fingerprints from remaining on the surface of the display module. Here, the specific structure of the display module can be seen in Figure 1 The structural diagram of the display module 1 shown in (b) is not repeated here. The display module can also add layers based on actual needs to meet different application scenarios. For example, the display module can also include an antistatic layer, which is located between the anti-fingerprint layer and the protective layer to reduce the friction static electricity generated on the surface of the display module.

[0075] In an embodiment of the present application, since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are all located in the display area, it is possible to control the input voltage parameter value of the first display pixel circuit and the input voltage parameter value of the second display pixel circuit differently so that the deviation between the reset current value of the photodiode in the first display pixel circuit and the reset current value of the photodiode in the second display pixel circuit is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen 11 resets the photodiode multiple times within each frame scanning time, thereby improving the display effect of the display module.

[0076] Based on the display module in the above embodiment, the present application also provides an electronic device, which includes a display module and a housing connected to the display module. Figure 1 The electronic device shown in (a) is a schematic diagram of the structure when it is a smart phone, which will not be repeated here.

[0077] In an embodiment of the present application, since the number of photodiodes that need to be reset when any current scanning row among multiple current scanning rows is located in the non-display area is different from the number of photodiodes that need to be reset when multiple current scanning rows are all located in the display area, it is possible to control the input voltage parameter value of the first display pixel circuit and the input voltage parameter value of the second display pixel circuit differently so that the deviation between the reset current value of the photodiode in the first display pixel circuit and the reset current value of the photodiode in the second display pixel circuit is less than a preset threshold value, thereby effectively avoiding the problem of uneven brightness display when the display screen 11 resets the photodiode multiple times within each frame scanning time, thereby improving the screen display effect of the electronic device.

[0078] The above are only specific implementations 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 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 screen, characterized in that: The display screen includes a display pixel circuit and a controller, wherein: The display pixel circuits are arranged in an array in a display area of ​​the display screen, the display pixel circuits include photodiodes, and the display pixel circuits include a first display pixel circuit and a second display pixel circuit; During each frame scanning time of the display screen, the controller is used to, when any current scanning row among multiple current scanning rows is located in the non-display area, control the input voltage parameter value of the first display pixel circuit to be a first voltage, the reset current value of the photodiode in the first display pixel circuit to be a first current value, and the first display pixel circuit is a display pixel circuit corresponding to the current scanning row located in the display area; when the multiple current scanning rows are all located in the display area, control the input voltage parameter value of the second display pixel circuit to be a second voltage, the reset current value of the photodiode in the second display pixel circuit to be a second current value, the deviation between the second current value and the first current value is less than a preset threshold value, and the second display pixel circuit is a display pixel circuit corresponding to the multiple current scanning rows.

2. The display screen according to claim 1, characterized in that: The display pixel circuit also includes a reset switch tube and an initial voltage input terminal, wherein the initial voltage input terminal is connected to the anode of the photodiode through the reset switch tube; and the input voltage parameter value of the display pixel circuit is the anode voltage value of the photodiode.

3. The display screen according to claim 2, characterized in that: The controller is used to control the voltage value of the initial voltage input terminal of the first display pixel circuit to be the first voltage and control the reset switch tube of the first display pixel circuit to be turned on when any current scanning row among the current scanning rows is located in the non-display area, and to control the voltage value of the initial voltage input terminal of the second display pixel circuit to be the second voltage and control the reset switch tube of the second display pixel circuit to be turned on when the multiple current scanning rows are all located in the display area.

4. The display screen according to claim 1, characterized in that: The display pixel circuit also includes a reset switch tube and an initial voltage input terminal, wherein the initial voltage input terminal is connected to the cathode of the photodiode through the reset switch tube; and the input voltage parameter value of the display pixel circuit is the cathode voltage value of the photodiode.

5. The display screen according to claim 4, characterized in that: The controller is used to control the voltage value of the initial voltage input terminal of the first display pixel circuit to be the first voltage and control the reset switch tube of the first display pixel circuit to be turned on when any current scanning row among the current scanning rows is located in the non-display area, and to control the voltage value of the initial voltage input terminal of the second display pixel circuit to be the second voltage and control the reset switch tube of the second display pixel circuit to be turned on when the multiple current scanning rows are all located in the display area.

6. The display screen according to claim 1, characterized in that: The display pixel circuit also includes a driving switch tube, a storage capacitor, a data transmission switch tube, a data input end and a power supply end. The first end of the driving switch tube is connected to the power supply end, the second end of the driving switch tube is connected to the anode of the photodiode, the control end of the driving switch tube is connected to the data input end through the data transmission switch tube, and the storage capacitor is connected between the first end and the control end of the driving switch tube; the input voltage parameter value of the display pixel circuit is the voltage value of the storage capacitor.

7. The display screen according to claim 6, characterized in that: The controller is used to control the conduction duration of the data transmission switch tube in the first display pixel circuit to be a first duration, and the voltage value of the storage capacitor in the first display pixel circuit to be the first voltage when any current scanning row among the current scanning rows is located in the non-display area; when the multiple current scanning rows are all located in the display area, control the conduction duration of the data transmission switch tube in the second display pixel circuit to be a second duration, and the voltage value of the storage capacitor in the second display pixel circuit to be the second voltage; when the voltage value of the storage capacitor is the first voltage or the second voltage, the driving switch tube is in the on state.

8. The display screen according to claim 1, characterized in that: The display pixel circuit also includes a data transmission switch tube, a driving switch tube, a data input terminal and a power supply terminal, wherein the first terminal of the driving switch tube is connected to the power supply terminal, the second terminal of the driving switch tube is connected to the anode of the photodiode, and the control terminal of the driving switch tube is connected to the data input terminal through the data transmission switch tube; the input voltage parameter value of the display pixel circuit is the control terminal voltage value of the driving switch tube.

9. The display screen according to claim 8, characterized in that: The controller is used to control the voltage value of the data input terminal of the first display pixel circuit to be the first voltage and control the data transmission switch tube of the first display pixel circuit to be turned on when any current scanning row among the current scanning rows is located in the non-display area, and to control the voltage value of the data input terminal of the second display pixel circuit to be the second voltage and control the data transmission switch tube of the second display pixel circuit to be turned on when the multiple current scanning rows are all located in the display area, wherein the first voltage and the second voltage are both greater than the turn-on voltage threshold of the driving switch tube.

10. The display screen according to claim 1, characterized in that: The display pixel circuit also includes a data transmission switch tube, a driving switch tube, a data input terminal and a power supply terminal, wherein the first terminal of the driving switch tube is connected to the power supply terminal, the second terminal of the driving switch tube is connected to the anode of the photodiode, and the control terminal of the driving switch tube is connected to the data input terminal through the data transmission switch tube; the input voltage parameter value of the display pixel circuit is the control terminal voltage value of the data transmission switch tube.

11. The display screen according to claim 10, characterized in that: The first voltage and the second voltage are both less than a turn-on voltage threshold of the data transmission switch tube.

12. The display screen according to claim 10, characterized in that: The first voltage and the second voltage are both greater than a turn-on voltage threshold of the data transmission switch tube.

13. The display screen according to any one of claims 1 to 12, characterized in that: The display pixel circuit further includes a third display pixel circuit and a fourth display pixel circuit; During each frame scan time when the frame rate of the display screen is the first frame rate, the controller is used to control the input voltage parameter value of the first display pixel circuit to be the first voltage when any current scan line among the multiple current scan lines is located in the non-display area, and to control the input voltage parameter value of the second display pixel circuit to be the second voltage when all the multiple current scan lines are located in the display area; The controller is further configured to, during each frame scan time after the frame rate of the display screen switches from the first frame rate to the second frame rate, control the input voltage parameter value of the third display pixel circuit to be the first voltage, the reset current value of the photodiode in the third display pixel circuit to be the first current value, and the third display pixel circuit to be the display pixel circuit corresponding to the current scan row located in the display area when any current scan row among the multiple current scan rows is located in the non-display area; and control the input voltage parameter value of the fourth display pixel circuit to be the second voltage, the reset current value of the photodiode in the fourth display pixel circuit to be the second current value, and the fourth display pixel circuit to be the display pixel circuit corresponding to the multiple current scan rows when all the multiple current scan rows are located in the display area.

14. The display screen according to claim 13, characterized in that: The first frame rate and the second frame rate are any two preset frame rates among K preset frame rates, wherein K≥F*x-x+1, the i-th preset frame rate among the K preset frame rates is F*x / (x+i-1), i is a positive integer, F is the maximum frame rate of the display screen, and x is the number of the multiple current scanning lines.

15. A display module, comprising a protective layer, an anti-fingerprint layer and the display screen according to any one of claims 1 to 14, wherein: The protection layer is located on a first surface of the display screen, and the anti-fingerprint layer is located on a surface of the protection layer away from the display screen.

16. An electronic device, characterized in that: The electronic device comprises a housing and a display module as claimed in claim 15 connected to the housing.

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