Display driving system, display module, display screen driving method and electronic equipment

Abstract

Embodiments of the present application provide a display driving system, a display screen driving method and an electronic device, which can improve the flexibility of the design of the display driving system. The electronic device comprises a display screen, the display screen comprising a first display area and a second display area; a display driving system comprising a first EM signal output end configured to send a first EM signal to the display screen; the display driving system further comprises a second EM signal output end configured to send a second EM signal to the display screen; wherein the first EM signal is configured to control the first display area to display an image in a first time period, and the second EM signal is configured to control the second display area not to display an image in the first time period.

Description

[0001] This application is a divisional application. The original application has the application number 201910843928.9 and the original application date is September 6, 2019. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of terminal technology, and in particular to display driving systems, display modules, display screen driving methods, and electronic devices. Background Technology

[0003] With the rapid development of electronic technology, smart terminals, tablets, and other electronic devices have drastically changed people's lives and work. To meet users' diverse needs for entertainment, work, video viewing, and web browsing, the screen size of electronic devices is becoming increasingly larger. Furthermore, to improve user experience, a single screen can be divided into multiple display areas, each capable of displaying different images or applications. For example, one display area might be used to play a video, while another could be used to present a chat interface, simultaneously satisfying multiple user needs. Multiple display areas can also be combined to present the same image or video. Foldable screens are a typical example of displays with multiple display areas. For portability, electronic devices are designed with foldable screens, allowing users to fold the screen to create a smaller display or unfold it into a larger display for functions such as web browsing and video viewing.

[0004] However, multi-area displays also present significant design challenges for display driver systems. For instance, as the display area increases and the design complexity of the display driver system grows, the power consumption of electronic devices also increases. How to design display driver systems to reduce the power consumption of electronic devices is a pressing issue for the industry. Summary of the Invention

[0005] This application provides a display driving system, a display module, a driving method for a display screen, and an electronic device, which can improve the flexibility of display driving system design.

[0006] In a first aspect, an electronic device is provided, comprising: a display screen, the display screen including a first display area and a second display area; a display driving system including a first EM signal output terminal for sending a first EM signal to the display screen; the display driving system further including a second EM signal output terminal for sending a second EM signal to the display screen; wherein the first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period.

[0007] In this embodiment, different EM signals are used to independently control the light-emitting and non-light-emitting states of the pixel circuits in each of the multiple display areas of the display screen, providing independent EM management functions for each display area. Therefore, when a display area is not displaying an image, the EM signal can be used to control that display area to not display an image, without continuously outputting a video source signal indicating a black screen. This improves the flexibility of the display driving system design and provides the possibility of reducing the power consumption of the display driving circuit.

[0008] In conjunction with the first aspect, in one possible implementation, the first EM signal remains at a first level or transitions between the first level and a second level during the first time period, and the second EM signal remains at the second level during the first time period; wherein, when the first EM signal is at the first level, the first display area is controlled to emit light, and when the first EM signal is at the second level, the first display area is controlled to not emit light; when the second EM signal is at the first level, the second display area is controlled to emit light, and when the second EM signal is at the second level, the second display area is controlled to not emit light.

[0009] As an example, the first EM signal can be a pulse width modulation (PWM) signal during the first time period.

[0010] In conjunction with the first aspect, in one possible implementation, the display driving system further includes a video source output terminal, configured to: output a video source signal corresponding to the first display area within a first time interval in a first time frame, and turn off the video source signal corresponding to the second display area within a second time interval in the first time frame, wherein the first time frame belongs to the first time period.

[0011] In this embodiment, the display driving system can turn off the video source signal corresponding to one of the multiple display areas during a period when one of the display areas does not display an image, thereby reducing the power consumption of the display driving system.

[0012] In conjunction with the first aspect, in one possible implementation, the display driving system further includes a video source output terminal, configured to: output a video source signal corresponding to the first display area indicating a black screen within the first time interval of the second time frame, wherein the second time frame is adjacent to and precedes the third time frame, and wherein the first EM signal is further configured to control the first display area to switch from displaying an image to not displaying an image starting from the third time frame.

[0013] In this embodiment of the application, in order to avoid screen distortion during the switching of the display area between the display state and the non-display state, the display driving system can first instruct the display area to display a black screen through the video source signal before switching the state, and then switch to the display image state or the non-display image state, thereby avoiding the screen distortion phenomenon and improving the user experience.

[0014] In conjunction with the first aspect, in one possible implementation, the display driving system further includes a video source output terminal, configured to: output a video source signal corresponding to the first display area indicating a black screen within the first time interval of the fourth time frame, wherein the fourth time frame is adjacent to and precedes the fifth time frame, and wherein the first EM signal is further configured to control the first display area to switch from displaying an image to displaying an image starting from the fourth time frame.

[0015] In this embodiment of the application, in order to avoid screen distortion during the switching of the display area between the display state and the non-display state, the display driving system can first instruct the display area to display a black screen through the video source signal before switching the state, and then switch to the display image state or the non-display image state, thereby avoiding the screen distortion phenomenon and improving the user experience.

[0016] In conjunction with the first aspect, in one possible implementation, the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters.

[0017] In the embodiments of this application, different brightness correction parameters can be used to generate video source signals for different display areas. Therefore, the brightness of different display areas can be different, thereby improving the design flexibility of the display driving system and enhancing the user experience.

[0018] In conjunction with the first aspect, in one possible implementation, the brightness correction parameters include the display brightness vector (DBV).

[0019] In conjunction with the first aspect, in one possible implementation, the display driving system further includes: a first light-emitting layer positive voltage ELVDD output terminal for outputting a first ELVDD, the first ELVDD being used to provide a high power supply voltage for the pixel circuit of the first display area; and a second ELVDD output terminal for outputting a second ELVDD, the second ELVDD being used to provide a high power supply voltage for the pixel circuit of the second display area, wherein the voltage values ​​of the first ELVDD and the second ELVDD are different.

[0020] In the embodiments of this application, the display driving system can provide an independent power supply voltage signal for each of the multiple display areas, thereby facilitating the independent management of the power supply voltage of different display areas and improving the flexibility of the display driving system design.

[0021] In conjunction with the first aspect, in one possible implementation, the display driving system further includes: a first light-emitting layer negative voltage ELVSS output terminal for outputting a first ELVSS, the first ELVSS being used to provide a low power supply voltage for the pixel circuit of the first display area; and a second ELVSS output terminal for outputting a second ELVSS, the second ELVSS being used to provide a low power supply voltage for the pixel circuit of the second display area, wherein the voltage values ​​of the first ELVSS and the second ELVSS are different.

[0022] In the embodiments of this application, the display driving system can provide an independent power supply voltage signal for each of the multiple display areas, thereby facilitating the independent management of the power supply voltage of different display areas and improving the flexibility of the display driving system design.

[0023] In conjunction with the first aspect, in one possible implementation, the display driving system includes a first display driving circuit and a second display driving circuit, wherein the first display driving circuit includes a first EM signal output terminal, and the second display driving circuit includes a second EM signal output terminal.

[0024] In conjunction with the first aspect, in one possible implementation, the display driving system includes a first display driving circuit, which includes a first EM signal output terminal and a second EM signal output terminal.

[0025] In conjunction with the first aspect, in one possible implementation, the display screen includes a foldable display screen.

[0026] Secondly, a display driving system is provided for controlling a display screen, the display screen including a first display area and a second display area, the display driving system including: a first EM signal output terminal for sending a first EM signal to the display screen; and a second EM signal output terminal for sending a second EM signal to the display screen; wherein the first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period.

[0027] It should be understood that the display driving system of the second aspect and the electronic device of the first aspect are based on the same inventive concept. Therefore, the beneficial technical effects that the technical solution of the third aspect can achieve can be referred to the description of the first aspect, and will not be repeated here.

[0028] In conjunction with the second aspect, in one possible implementation, the first EM signal remains at a first level or transitions between the first and second levels during the first time period, and the second EM signal remains at the second level during the first time period; wherein, when the first EM signal is at the first level, the first display area is controlled to emit light, and when the first EM signal is at the second level, the first display area is controlled to not emit light; when the second EM signal is at the first level, the second display area is controlled to emit light, and when the second EM signal is at the second level, the second display area is controlled to not emit light.

[0029] As an example, the first EM signal can be a PWM signal during the first time period.

[0030] In conjunction with the second aspect, in one possible implementation, the display driving system further includes a video source output terminal, configured to: output a video source signal corresponding to the first display area within a first time interval in the first time frame, and turn off the video source signal corresponding to the second display area within a second time interval in the first time frame, wherein the first time frame belongs to the first time period.

[0031] In conjunction with the second aspect, in one possible implementation, the display driving system further includes a video source output terminal, configured to: output a video source signal corresponding to the first display area indicating a black screen within the first time interval of the second time frame, wherein the second time frame is adjacent to and precedes the third time frame, and wherein the first EM signal is further configured to control the first display area to switch from displaying an image to not displaying an image starting from the third time frame.

[0032] In conjunction with the second aspect, in one possible implementation, the display driving system further includes a video source output terminal, configured to: output a video source signal corresponding to the first display area indicating a black screen within the first time interval of the fourth time frame, wherein the fourth time frame is adjacent to and precedes the fifth time frame, and wherein the first EM signal is further configured to control the first display area to switch from displaying an image to displaying an image starting from the fourth time frame.

[0033] In conjunction with the second aspect, in one possible implementation, the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters.

[0034] In conjunction with the second aspect, in one possible implementation, the brightness correction parameter includes the display brightness vector (DBV).

[0035] In conjunction with the second aspect, in one possible implementation, the display driving system further includes: a first light-emitting layer positive voltage ELVDD output terminal for outputting a first ELVDD, the first ELVDD being used to provide a high power supply voltage for the pixel circuit of the first display area; and a second ELVDD output terminal for outputting a second ELVDD, the second ELVDD being used to provide a high power supply voltage for the pixel circuit of the second display area, wherein the voltage values ​​of the first ELVDD and the second ELVDD are different.

[0036] In conjunction with the second aspect, in one possible implementation, the display driving system further includes: a first light-emitting layer negative voltage ELVSS output terminal for outputting a first ELVSS, the first ELVSS being used to provide a low power supply voltage for the pixel circuit of the first display area; and a second ELVSS output terminal for outputting a second ELVSS, the second ELVSS being used to provide a low power supply voltage for the pixel circuit of the second display area, wherein the voltage values ​​of the first ELVSS and the second ELVSS are different.

[0037] In conjunction with the second aspect, in one possible implementation, the display driving system includes a first display driving circuit and a second display driving circuit, wherein the first display driving circuit includes a first EM signal output terminal, and the second display driving circuit includes a second EM signal output terminal.

[0038] In conjunction with the second aspect, in one possible implementation, the display driving system includes a first display driving circuit, which includes a first EM signal output terminal and a second EM signal output terminal.

[0039] In conjunction with the second aspect, in one possible implementation, the display screen includes a foldable display screen.

[0040] Thirdly, a driving method for a display screen is provided, the display screen including a first display area and a second display area, the method including: sending a first emitting EM signal to the display screen; sending a second EM signal to the display screen, wherein the first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period.

[0041] It should be understood that the driving method of the display screen in the third aspect is based on the same inventive concept as the electronic device in the first aspect. Therefore, the beneficial technical effects that the technical solution of the third aspect can achieve can be referred to the description of the first aspect, and will not be repeated here.

[0042] In conjunction with the third aspect, in one possible implementation, the first EM signal remains at a first level or transitions between the first level and a second level during the first time period, and the second EM signal remains at the second level during the first time period; wherein, when the first EM signal is at the first level, the first display area is controlled to emit light, and when the first EM signal is at the second level, the first display area is controlled to not emit light; when the second EM signal is at the first level, the second display area is controlled to emit light, and when the second EM signal is at the second level, the second display area is controlled to not emit light.

[0043] As an example, the first EM signal can be a PWM signal during the first time period.

[0044] In conjunction with the third aspect, in one possible implementation, the method further includes: outputting a video source signal corresponding to the first display area to the display screen during a first time interval in the first time frame, and turning off the video source signal corresponding to the second display area during a second time interval in the first time frame, wherein the first time frame belongs to the first time period.

[0045] In conjunction with the third aspect, in one possible implementation, the method further includes: outputting a video source signal corresponding to the first display area indicating a black screen to the display screen during a first time interval in the second time frame, wherein the second time frame is adjacent to and precedes the third time frame, and wherein the first EM signal is further used to control the first display area to switch from displaying an image to not displaying an image starting from the third time frame.

[0046] In conjunction with the third aspect, in one possible implementation, the method further includes: outputting a video source signal corresponding to the first display area indicating a black screen to the display screen within a first time interval in the fourth time frame, wherein the fourth time frame is adjacent to and precedes the fifth time frame, and wherein the first EM signal is further used to control the first display area to switch from not displaying an image to displaying an image starting from the fourth time frame.

[0047] In conjunction with the third aspect, in one possible implementation, the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters.

[0048] In conjunction with the third aspect, in one possible implementation, the brightness correction parameters include the display brightness vector (DBV).

[0049] In conjunction with the third aspect, in one possible implementation, the method further includes: outputting a first ELVDD to the display screen, the first ELVDD being used to provide a high power supply voltage for the pixel circuit of the first display area; and outputting a second ELVDD to the display screen, the second ELVDD being used to provide a high power supply voltage for the pixel circuit of the second display area, wherein the voltage values ​​of the first ELVDD and the second ELVDD are different.

[0050] In conjunction with the third aspect, in one possible implementation, the method further includes: outputting a first ELVSS to the display screen, the first ELVSS being used to provide a low power supply voltage for the pixel circuitry of the first display area; and outputting a second ELVSS to the display screen, the second ELVSS being used to provide a low power supply voltage for the pixel circuitry of the second display area, wherein the voltage values ​​of the first ELVSS and the second ELVSS are different.

[0051] In conjunction with the third aspect, in one possible implementation, the display screen includes a foldable display screen.

[0052] Fourthly, a chip is provided, including a processor. The processor is configured to read and execute a computer program stored in a memory to perform the methods of the third aspect or any possible implementation thereof.

[0053] Fifthly, a computer program product is provided, the computer program product comprising computer program code, which, when run on a computer, causes the computer to perform the method of the third aspect or any possible implementation thereof.

[0054] Sixthly, this application provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the method of the third aspect or any possible implementation thereof.

[0055] In a seventh aspect, this application provides a display module, the display module including a display screen and a display driving system in the second aspect or any possible implementation of the second aspect. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the unfolded state of an electronic device according to an embodiment of this application.

[0057] Figure 2 This is a schematic diagram of the folded state of an electronic device according to an embodiment of this application.

[0058] Figure 3This is a schematic diagram of the display state of a display screen according to an embodiment of this application.

[0059] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application.

[0060] Figure 5 This is a circuit diagram of a pixel circuit according to an embodiment of this application.

[0061] Figure 6 This is a circuit diagram of the reset stage of a pixel circuit according to an embodiment of this application.

[0062] Figure 7 This is a circuit diagram of the data voltage Vdata writing stage of a pixel circuit according to an embodiment of this application.

[0063] Figure 8 This is a circuit diagram of the light-emitting stage of a pixel circuit according to an embodiment of this application.

[0064] Figure 9 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application.

[0065] Figure 10 This is a schematic diagram of the structure of an electronic device according to another embodiment of this application.

[0066] Figure 11 This is a schematic diagram of the structure of an electronic device according to another embodiment of this application.

[0067] Figure 12 This is a schematic diagram of the structure of an electronic device according to another embodiment of this application.

[0068] Figure 13 This is a schematic diagram of the structure of a display driving system according to an embodiment of this application.

[0069] Figure 14 This is a schematic diagram of the clock signal of a display driving system according to an embodiment of this application.

[0070] Figure 15 This is a schematic diagram of a brightness control method for a display driving system according to an embodiment of this application.

[0071] Figure 16 This is a timing diagram showing the switching of the display state of a foldable display screen from region A+B to region A according to an embodiment of this application.

[0072] Figure 17 This is a timing diagram showing the switching of the display state of a foldable display screen from region A+B to region B according to an embodiment of this application.

[0073] Figure 18 This is a timing diagram showing the switching of the display state of a foldable display screen from region A to region A+B according to an embodiment of this application.

[0074] Figure 19 This is a timing diagram showing the switching of the display state of a foldable display screen from region A to region A+B according to another embodiment of this application.

[0075] Figure 20 This is a timing diagram showing the switching of the display state of a foldable display screen from region B to region A+B according to an embodiment of this application.

[0076] Figure 21 This is a timing diagram showing the switching of the display state of a foldable display screen from region B to region A+B according to another embodiment of this application.

[0077] Figure 22 This is a timing diagram showing the switching of the display state of a foldable display screen from region A to region B according to an embodiment of this application.

[0078] Figure 23 This is a timing diagram showing the switching of the display state of a foldable display screen from region A to region B according to another embodiment of this application.

[0079] Figure 24 This is a timing diagram showing the switching of the display state of a foldable display screen from region B to region A according to an embodiment of this application.

[0080] Figure 25 This is a timing diagram showing the switching of the display state of a foldable display screen from region B to region B according to another embodiment of this application. Detailed Implementation

[0081] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0082] This application provides a display driving system, a driving method for a display screen, and an electronic device. The display screen and display driving system can be installed in the electronic device.

[0083] In this application, the electronic device may include any electronic device with a display screen, such as a user device, mobile terminal, smartphone, or tablet computer. This application does not limit this type of electronic device.

[0084] The display screen in this application may include a foldable display screen or a non-foldable display screen. The following uses a foldable display screen as an example, combined with… Figure 1 and Figure 2 The appearance of an electronic device according to one embodiment of this application is described.

[0085] Figure 1 and Figure 2 This is a schematic diagram of the appearance of an electronic device 100 according to an embodiment of this application. Figure 1 The electronic device 100 is in the unfolded state. Figure 2The electronic device 100 is in a folded state. For example... Figure 1 As shown, the display screen 10 of the electronic device 100 includes a first display area 11 and a second display area 12. The first display area 11 can be folded relative to the second display area 12, and the dashed line shows the boundary line between the first display area 11 and the second display area 12. Figure 1 In this embodiment, when the display screen 10 is in the unfolded state, both the first display area 11 and the second display area 12 can be used to display images. Optionally, the display screen 10 can be implemented using a flexible screen. The flexible screen may include, for example, an organic light-emitting diode (OLED) display screen, etc., and this application embodiment does not limit this.

[0086] like Figure 2 As shown, when the display screen is in a folded state, the first display area 11 and the second display area 12 are folded back to back. If the user is facing the first display area 11, the first display area 11 can display an image, while the second display area 12 does not display an image. Alternatively, if the user is facing the second display area 12, the first display area 11 does not display an image, while the second display area 12 displays an image.

[0087] It should be understood that Figure 1 and Figure 2 The electronic device 100 is merely an example. This application does not limit the shape of the electronic device, as long as its display screen includes two or more display areas. This application uses an example with two display areas (11, 12) to describe the display driving system and the display screen driving method. Those skilled in the art will understand that the solutions in this application's embodiments are also applicable to electronic devices with two or more display areas; for simplicity, further details are omitted in this application's embodiments.

[0088] Figure 3 This is a schematic diagram of the display state of the screen in an embodiment of this application. For example... Figure 3 As shown, the display screen 10 may include a first display area 11 and a second display area 12, which may also be referred to as a first sub-screen and a second sub-screen, respectively. For ease of description, in this embodiment, the first display area 11 may be identified as area A, and the second display area 12 may be identified as area B. In some examples, the first display area 11 and the second display area 12 may be referred to as the front screen and the rear screen, respectively.

[0089] Optionally, such as Figure 3As shown in (a)-(c), the foldable display screen includes three display states. In the first operating state (Figure a), both areas A and B display images. For example, taking a foldable screen as an example, when the foldable screen is in the unfolded state, both areas A and B can be used to display images.

[0090] In the second operating state (Figure b), area A does not display an image, while area B displays an image. For example, taking a foldable screen as an example, when the display is folded, area B faces the user, and area A faces away from the user. Therefore, area B can be used to display an image, while area A does not display an image.

[0091] In the third display state (Figure c), the display screen is folded, with area A displaying an image and area B not displaying an image. For example, taking a foldable screen as an example, when the display screen is folded, area A faces the user, and area B faces away from the user. Therefore, area A can display an image, while area B does not.

[0092] Figure 4 This is a schematic diagram of the structure of an electronic device according to another embodiment of this application. Figure 4 As shown, the electronic device 100 includes a main controller 110, a display driving system 120, and a display screen 130. The main controller 110 is connected to the display driving system 120. For ease of explanation, the following description will be provided. Figure 4 The definition of modules or terms involved.

[0093] Main controller 110: Used to output video data, clock signals and / or main commands to display driver system 120. The main controller includes, but is not limited to, various types of processors such as system on chip (SOC), application processor (AP) or general-purpose processor.

[0094] Display driving system 120: Receives video data sent from the main controller 110, and performs digital and analog processing on the video data through a video processing module to obtain a video source signal. The video source signal is output to the display screen 130 to drive the display screen 130 to display images. Additionally, display driving system 120 can also perform EM control management, GOA control management, and power management on the display screen 130. It also outputs emission (EM) signals, emission layer positive voltage (EVDD, ELVDD), emission layer negative voltage (EVSS, ELVSS), and GOA signals to the display screen. In this embodiment, the video source signal can also be referred to as the source signal.

[0095] Display driver circuit: The display driver system 120 may include one or more display driver circuits, each of which may be a display driver hardware module. When the display driver system 120 includes multiple display driver circuits, interfaces may exist between the multiple display driver circuits to facilitate synchronization or interaction. In one example, the display driver circuit may also be referred to as a display driver integrated circuit (DDIC).

[0096] Pixel circuit: This is the smallest circuit unit in a display screen. One pixel circuit is equivalent to a sub-pixel (or sub-pixel) in the display screen circuit. The display screen includes multiple rows of sub-pixels. Based on the structure of the pixel circuit, the sub-pixels in the display screen are scanned and illuminated line by line. Therefore, when displaying a frame of image, after the first row of sub-pixels illuminates, they need to remain illuminated until the last row of sub-pixels illuminates in order to display a frame of image.

[0097] Gate driver on array (GOA): Used to provide strobe signals for each row of pixel circuits to control the on or off state of each row of pixel circuits. In this embodiment, the gate driver array can also be simply referred to as a gate array.

[0098] To facilitate understanding of the solutions in this application, the structure and working principle of the pixel circuit in the display screen of this application will be described below with reference to the accompanying drawings. It should be noted that the following description is merely an example of a pixel circuit and not a limitation on the scope of protection of this application. Solutions or modifications thereof obtained by those skilled in the art based on the solutions in this application without inventive effort also fall within the scope of protection of this application.

[0099] Figure 5 This is a circuit diagram of a pixel circuit according to an embodiment of this application. Figure 5 As shown, the pixel circuit 50 may include a capacitor Cst, a light-emitting device L, and multiple transistors (M1, M2, M3, M4, M5, M6, M7). For ease of explanation, transistor M1 is referred to as the first reset transistor, transistor M7 as the second reset transistor, transistor M4 as the driving transistor, transistor M6 as the first light-emitting control transistor, and transistor M5 as the second light-emitting control transistor. It should be noted that this is merely an example of a pixel circuit; other designs are also possible, such as a 2T1C circuit with only two transistors and one capacitor, a 4T1C circuit with four transistors and one capacitor, or a 5T2C circuit with five transistors and two capacitors. These pixel circuit designs can all control the conduction and cutoff of a transistor connected in series with the light-emitting device using an EM signal, thereby controlling the light emission of the light-emitting device. This application does not limit the scope of these designs.

[0100] It should be noted that the light-emitting device L mentioned above can be an organic light-emitting diode (OLED). In this case, the display screen is an OLED display. Alternatively, the light-emitting device L can be a micro light-emitting diode (micro LED). In this case, the display screen is a micro LED display. For ease of description, the following examples all use OLED as the light-emitting device L.

[0101] based on Figure 5 The structure of the pixel circuit 50 shown includes the following operation process: Figures 6-8 The three stages shown are: Stage 1①, Stage 2②, and Stage 3③. Figure 6 , Figure 7 as well as Figure 8 For ease of explanation, the cut-off transistors are distinguished by adding an "×" mark.

[0102] In the first stage ①, under the control of the gating signal N-1, such as Figure 6 As shown, the first reset transistor M1 and the second reset transistor M7 are turned on. The initial voltage Vint is transmitted to the gate of the driving transistor M4 through the first reset transistor M1, thereby resetting the gate of the driving transistor M4. Furthermore, the initial voltage Vint is transmitted to the anode (a) of the OLED through the second reset transistor M7, resetting the anode (a) of the OLED. At this time, the voltage Va of the anode (a) of the OLED and the voltage Vg4 of the gate (g) of the driving transistor M4 are both Vint.

[0103] In this way, in the first stage ①, the voltages of the gate g of the driving transistor M4 and the anode a of the OLED can be reset to the initial voltage Vint, thereby preventing the voltages remaining in the gate g of the driving transistor M4 and the anode a of the OLED from the previous image frame from affecting the next image frame. Therefore, the first stage ① described above can be called the reset stage.

[0104] In the second stage ②, under the control of the gating signal N, such as Figure 7 As shown, transistors M2 and M3 are turned on. With transistor M3 on, the gate g of the driving transistor M4 is coupled to its drain (d), and the driving transistor M4 is in a diode-on state. At this time, the data voltage Vdata is written to the source s of the driving transistor M4 through the turned-on transistor M2. Therefore, the above-mentioned second stage ② can be called the data voltage Vdata writing stage of the pixel circuit.

[0105] In the third stage ③, under the control of the light-emitting control signal EM, the second light-emitting control transistor M5 and the first light-emitting control transistor M6 are turned on, and the current path between the high power supply voltage ELVDD and the low power supply voltage ELVSS is opened. The driving current I generated by the driving transistor M4 is transmitted to the OLED through the above current path to drive the OLED to emit light.

[0106] Since OLEDs emit light in the third stage ③ described above, this third stage ③ can be called the light-emitting stage. As can be seen from the description of the third stage ③, the EM signal can control whether the pixel circuit is in a light-emitting or non-light-emitting state.

[0107] It should be noted that Vdata can be understood as the voltage signal corresponding to that pixel circuit in the video source signal output by the display driver system 120 to the display screen. Each pixel circuit corresponds to a different Vdata, which can be used to control the magnitude of the drive current I, thereby controlling the light emission intensity of the pixel circuit. For example, depending on the design of some pixel circuits, the drive current I∝(ELVDD-Vdata) 2 Of course, this is just an example. Depending on the pixel circuit design, the driving current I and Vdata may satisfy other functional relationships. It should be noted that when the display screen is in a black state, the light-emitting device L does not emit light. However, due to the structure and design principle of the pixel circuit, the pixel circuit still needs to receive the Vdata signal. The voltage of the Vdata signal should be set so that the driving current I is as close to zero as possible, thus preventing the light-emitting device L from emitting light. In some examples, in the black screen state, the voltage of Vdata can be set higher than the voltage of ELVDD, for example, Vdata = 5.3V, ELVDD = 4.6V.

[0108] As can be seen from the above description, even when the display screen is black, the display driver system 120 still needs to continuously output video source signals (i.e., Vdata) to the display screen. Therefore, the display driver system 120 also needs to generate video source signals, which obviously increases the power consumption of the display driver system 120.

[0109] Within one time frame in which the display screen displays each frame of image, the display driver system 120 outputs a video source signal corresponding to the first display area in a first time interval of the time frame, and outputs a video source signal corresponding to the second display area in a second time interval of the time frame. For example, if an image is displayed in the first display area of ​​the display screen, but not in the second display area, the display driver system 120 also needs to output a video source signal indicating a black screen in the second time interval of each time frame to keep the second display area from displaying an image, thus increasing the power consumption of the display driver system 120.

[0110] If, in order to save power, the video source signal is directly turned off in the second time interval of each time frame, then since the EM signals of the first and second display areas are the same, the EM signal will still control the second light-emitting control transistor M5 and the first light-emitting control transistor M6 in the pixel circuit to conduct during the light-emitting phase. Current may still flow through the light-emitting device L, resulting in a distorted screen in the second display area, severely impacting the user experience. Therefore, existing solutions typically choose to output a video source signal indicating a black screen to the second display area, which is a Vdata signal where the current flowing through the light-emitting device L is close to 0.

[0111] To further reduce the power consumption of the display screen, this application proposes a driving scheme for a display driving system. In this scheme, the display driving system can provide independent EM management functions for each display area in multiple display areas, thereby improving the flexibility of the display driving system design and providing the possibility of reducing the power consumption of the display screen driving circuit.

[0112] Figure 9 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application, such as... Figure 9 As shown, the electronic device 100 includes a main controller 110, a display driving system 120, and a display screen 130. The display screen 130 includes a first display area 11 and a second display area 12. The display screen 130 can be a foldable screen or a non-foldable screen, and can be a flexible screen or a rigid display screen.

[0113] The display driving system 120 includes a first EM signal output terminal for sending a first EM signal to the display screen 130. The display driving system 120 also includes a second EM signal output terminal for sending a second EM signal to the display screen 130. The first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period; and / or, the first EM signal is used to control the first display area not to display an image during a second time period, and the second EM signal is used to control the second display area to display an image during the second time period.

[0114] Optionally, the first EM signal is used to control the first display area to display an image during the third time period, and the second EM signal is used to control the second display area to display an image during the third time period.

[0115] The first EM signal and the second EM signal mentioned above can be control signals used to control the pixel circuits in the display screen to emit light or not emit light. As an example, the first EM signal and the second EM signal can be... Figures 5-8The EM signals described herein. In other words, the first EM signal and the second EM signal are used to control the light-emitting device L in the pixel circuit to emit light during the light-emitting phase of the pixel circuit.

[0116] Optionally, the first, second, and / or third time periods described above may include multiple time frames, with the display scanning one frame of image in each time frame. As an example, the duration of each time frame may be 16.67 ms, i.e., the refresh rate of the display is 60 Hz.

[0117] As an example, assuming the EM signal controls the light-emitting device L in the pixel circuit to emit light when it is low, and controls the light-emitting device L in the pixel circuit to not emit light when it is high, then when an image is displayed in the display area, since the EM signal is high during the reset phase and the Vdata write phase, and low during the light-emitting phase, the EM signal in each time frame when the image is displayed on the screen is a pulse width modulation (PWM) signal. That is, the EM signal is in a state of rapid switching between high and low levels, which can be referred to as the EM signal being in a normal working state in this embodiment. Due to the fast switching frequency of the EM signal, based on the persistence of vision phenomenon of the human eye, the display area appears to be constantly displaying an image. However, when no image is displayed in the display area, the EM signal remains at a high level for multiple consecutive time frames, which can be referred to as the EM signal being in a closed state in this embodiment. That is, from the human eye's perspective, the display area appears to be not displaying an image.

[0118] Alternatively, the EM signal can also control the light-emitting device L in the pixel circuit to emit light when it is high, and control the light-emitting device L in the pixel circuit to not emit light when it is low. Therefore, in this case, when the EM signal is low for multiple time frames, the display area it controls does not display an image.

[0119] In one example, during the first time period described above, the first EM signal is a signal that transitions between a first level and a second level (e.g., a PWM signal) or remains at the first level, while the second EM signal remains at the second level. And / or, during the second time period described above, the first EM signal remains at the first level, and the second EM signal is a signal that transitions between a first level and a second level (e.g., a PWM signal) or remains at the first level. And / or, during the third time period described above, both the first EM signal and the second EM signal are signals that transition between a first level and a second level (e.g., PWM signals) or both remain at the first level.

[0120] Specifically, when the EM signal is at a first level, it controls the light-emitting device in the pixel circuit to emit light; when the EM signal is at a second level, it controls the light-emitting device in the pixel circuit to not emit light. In one example, the first level is high and the second level is low. Alternatively, in another example, the first level is low and the second level is high.

[0121] In this embodiment, the display driving system 120 controls the first display area 11 and the second display area 12 in the display screen through independent first EM signals and second EM signals, providing independent EM management functions for different display areas. During the time period when one of the display areas does not display an image, the EM signal can control the pixel circuits in that display area to not emit light. Figure 8 Taking the description of the pixel circuit in the light-emitting stage as an example, during the period when the display area is not displaying an image under the control of the EM signal, the EM signal can control the second light-emitting control transistor M5 and the first light-emitting control transistor M6 to not conduct. Therefore, the path between ELVDD and ELVSS will not be connected, and no current will flow in the light-emitting device L. Thus, it is not necessary to set the voltage Vdata to make the pixel circuit not emit light. In other words, by providing independent EM management functions for each display area, the display driving system can turn off the corresponding video source signal during the period when a certain display area is not displaying an image, thereby achieving the purpose of saving power consumption.

[0122] In this embodiment, different EM signals are used to independently control the light-emitting and non-light-emitting states of the pixel circuits in each of the multiple display areas of the display screen, providing independent EM management functions for each display area. Therefore, when a display area is not displaying an image, the EM signal can be used to control that display area to not display an image, without continuously outputting a video source signal indicating a black screen. This improves the flexibility of the display driving system design and provides the possibility of reducing the power consumption of the display driving circuit.

[0123] The display driving system 120 also includes a video output terminal for outputting a video source signal, which is used to drive the display screen to display an image.

[0124] Optionally, when an image is displayed in the first display area and no image is displayed in the second display area, the video source output terminal is further configured to: output a video source signal corresponding to the first display area within the first time interval of the first time frame, and turn off the video source signal corresponding to the second display area within the second time interval of the first time frame, wherein the first time frame belongs to the first time period.

[0125] Similarly, when the first display area does not display an image and the second display area displays an image, the video source output terminal is further configured to: turn off the video source signal corresponding to the first display area within the first time interval of the sixth time frame, and output the video source signal corresponding to the second display area within the sixth time interval of the sixth time frame, wherein the sixth time frame belongs to the second time period.

[0126] In this embodiment, the display driving system can turn off the video source signal corresponding to one of the multiple display areas during a period when one of the display areas does not display an image, thereby reducing the power consumption of the display driving system.

[0127] The display driving system shutting down the video source signal may include opening the output terminal of the video source or setting a bias voltage. Optionally, during the corresponding time interval of shutting down the video source signal in each time frame, all or part of the modules in the display driving circuit used to process the corresponding video source signal may also be shut down to reduce power consumption.

[0128] The display driving system may include one display driving circuit or multiple display driving circuits. In the case of multiple display driving circuits, there may be interfaces between the multiple display driving circuits.

[0129] As an example, Figure 10 This is a schematic diagram of the structure of an electronic device according to another embodiment of this application. Figure 10 The display driver system in the image includes multiple display driver circuits. For example... Figure 10 As shown, the display driving system 120 may include a first display driving circuit 1201 and a second display driving circuit 1202. The first display driving circuit 1201 is used to output the first EM signal and a first video source signal corresponding to the first display area 11, and the second display driving circuit 1202 is used to output the second EM signal and a second video source signal corresponding to the second display area 12. An interface may exist between the first display driving circuit 1201 and the second display circuit 1202. Figure 10 (not shown in the image) to facilitate synchronization and interaction between multiple display driver circuits. Figure 10 The working principle of the display driver system in Figure 10 The electronic devices mentioned are the same or similar, and will not be elaborated here.

[0130] Optionally, the display driving system can provide independent power voltage management for each of the multiple display areas in the display screen.

[0131] Figure 11This is a schematic diagram of the structure of an electronic device according to another embodiment of this application. Figure 11 As shown, the display driving system 120 further includes a first emission layer positive voltage (ELVDD) output terminal for outputting a first ELVDD, which provides a high power supply voltage to the pixel circuit of the first display area; and a second ELVDD output terminal for outputting a second ELVDD, which provides a high power supply voltage to the pixel circuit of the second display area. The voltage values ​​of the first ELVDD and the second ELVDD may be different. As an example, when an image is not displayed in one of the display areas, the display driving system can turn off the power supply voltage of that display area. For example, the first ELVDD can be the operating voltage, and the second ELVDD can be 0, open circuit, or biased to other voltages.

[0132] As an example, the first ELVDD and the second ELVDD may include Figures 5-8 ELVDD in the context of ELVDD.

[0133] See also Figure 11 The display driving system further includes: a first emission layer negative voltage (ELVSS) output terminal for outputting a first ELVSS, which provides a low power supply voltage to the pixel circuit of the first display area; and a second ELVSS output terminal for outputting a second ELVSS, which provides a low power supply voltage to the pixel circuit of the second display area. The voltage values ​​of the first ELVSS and the second ELVSS may be different. For example, the voltage value of the first ELVSS may be 0 or ground, and the voltage value of the second ELVSS may be open circuit or connected to other bias voltages.

[0134] The first ELVSS and the second ELVSS may include Figures 5-8 ELVSS in the middle.

[0135] In the embodiments of this application, the display driving system can provide an independent power supply voltage signal for each of the multiple display areas, thereby facilitating the independent management of the power supply voltage of different display areas and improving the flexibility of the display driving system design.

[0136] Optionally, the display driving system can also provide independent GOA clock control management for different display areas and provide independent GOA signals for different display areas. The GOA signal is used to control the GOA's on / off state. As an example, the display driving system further includes a first GOA output terminal, which outputs a first GOA signal corresponding to a first display area to the display screen. The first GOA signal is used to control the GOA in the first display area to be on or off. The display driving system also includes a second GOA output terminal, which outputs a second GOA signal, which is used to control the GOA in a second display area to be on or off. During a given time period, the phase, voltage value, or voltage value switching state between the first GOA signal and the second GOA signal can be the same or different.

[0137] In this embodiment, the display driving system can provide an independent GOA clock signal for each of the multiple display areas, thereby facilitating the independent management of the GOA activation and deactivation of different display areas and improving the flexibility of the display driving system design.

[0138] Figure 12 This is a schematic diagram of the structure of an electronic device according to another embodiment of this application. Figure 12 The display driver system in the image includes multiple display driver circuits. For example... Figure 12 As shown, the display driving system 120 includes a first display driving circuit 1201 and a second display driving circuit 1202. The first display driving circuit 1201 further includes a first ELVDD output terminal and a first ELVSS output terminal, and the second display driving circuit 1202 further includes a second ELVDD output terminal and a second ELVSS output terminal. Figure 12 The working principle of the display driver system in Figure 11 The display driver systems in these systems are the same or similar, and will not be described further here.

[0139] To avoid screen flickering during the switching between display and non-display states, the display driving system can first instruct the display area to display a black screen via a video source signal before switching to either the display image state or the non-display image state. This can prevent screen flickering and improve the user experience.

[0140] Taking the switching of the display area from displaying an image to not displaying an image as an example, the video source output terminal can first send a video source signal indicating a black screen to the display area within one or more time frames, thus instructing the display area to display a black screen. Then, within one or more time frames after the time frame indicating the black screen, the video source signal corresponding to the display area is turned off, thereby avoiding screen flickering and improving the user experience. It should be noted that, in this embodiment, for the human eye, there is no difference between the display area being in a black screen state or a source-off state; that is, in both states, the display area seen by the human eye does not display an image.

[0141] In one example, taking the first display area switching from displaying an image to a non-display state as an example, the video source output terminal is further used to: output a video source signal corresponding to the first display area indicating a black screen within the first time interval in the second time frame, wherein the second time frame is adjacent to the third time frame and is located before the third time frame, wherein the first EM signal is further used to control the first display area to switch from displaying an image to a non-displaying image starting from the third time frame.

[0142] Taking the switching of the display area from a non-display state to display an image as an example, the video source output terminal can first send a video source signal indicating a black screen to the display area within one or more time frames to instruct the display area to display a black screen. Then, the image is displayed within one or more time frames following the time frame indicating the black screen.

[0143] In one example, taking the first display area switching from displaying an image to not displaying an image as an example, the video source output terminal is further used to: output a video source signal corresponding to the first display area indicating a black screen within the first time interval in the fourth time frame, wherein the fourth time frame is adjacent to the fifth time frame and is located before the fifth time frame, wherein the first EM signal is further used to control the first display area to switch from not displaying an image to displaying an image starting from the fourth time frame.

[0144] Optionally, before outputting the video source signal, the display driver system typically needs to perform brightness processing on the video data. Two methods are generally used for brightness processing of video data. The first is pulse width modulation (PWM), which adjusts the brightness by changing the duty cycle of the EM signal. The longer the EM signal controls the pixel circuit to emit light within a time frame, the higher the display brightness of the display area, and vice versa. For example, assuming a time frame is 16ms long, the EM signal controls the pixel circuit to emit light for 8ms and keeps it off for the remaining 8ms. To increase the brightness, the EM signal can be set to control the pixel circuit to emit light for 10ms and keep it off for the remaining 6ms. In the prior art, since the EM signals of multiple display areas in a display screen are controlled by the same EM management module, multiple display areas can only use the same brightness control method. However, in this embodiment, since multiple EM signals are used to independently manage multiple display areas, different display areas can use different brightness control modes, improving the user experience. For example, if a user needs to use the first display area to watch videos and the second display area to browse web pages, the brightness of the two display areas can be adjusted to be different.

[0145] The second method of brightness modulation is based on voltage and current adjustment, meaning the brightness can be adjusted according to the magnitude of the voltage Vdata. The digital circuitry in a display driver system typically includes a brightness processing module for processing the brightness of the video data. In this embodiment, the brightness processing module can perform brightness correction on the video data of different display areas based on different brightness correction parameters. Therefore, different display areas can employ different brightness control modes, improving the user experience.

[0146] As an example, OLED displays typically use a combination of the two methods described above to adjust the brightness of the display area.

[0147] It's important to note that brightness processing typically includes gamma correction. Gamma correction refers to a method of adjusting image brightness or contrast. Specifically, in the field of image display, since the human visual system's perception of screen brightness is roughly logarithmic rather than linear, gamma correction is needed to ensure that the image displayed on the screen is identical to the original image. This involves adjusting the screen's grayscale curve to achieve the best visual effect. The grayscale curve is a characteristic curve indicating the relationship between different gray levels and brightness on the screen. Gamma correction can be implemented using a gamma lookup table (LUT). A gamma LUT can be a mapping table of pixel grayscale values. It can transform the actual sampled pixel grayscale values ​​through certain transformations, such as thresholding, inversion, binarization, contrast adjustment, and linear transformation, into another corresponding grayscale value. This achieves the effect of highlighting useful information in the image and enhancing image contrast.

[0148] In the embodiments of this application, different brightness correction parameters can be used to generate video source signals for different display areas. Therefore, the brightness of different display areas can be different, thereby improving the design flexibility of the display driving system and enhancing the user experience.

[0149] Optionally, in the embodiments of this application, different brightness processing modules can be used to implement brightness control functions for different display areas, or the same brightness processing module can be used to implement brightness control functions for different display areas. The brightness processing module is typically located in the digital circuit section of the display driving system. In one example, the brightness processing module can be a voltage code generator.

[0150] In one example, the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters. Optionally, the brightness correction parameters include the display brightness vector (DBV).

[0151] In the embodiments of this application, since different display areas use independent brightness control management, the brightness adjustment range of each display area is not limited by the brightness levels of other display areas, thereby increasing the degree of freedom in brightness adjustment of each display area.

[0152] Figure 13 This is a schematic diagram of the display driving circuit according to an embodiment of this application. Figure 13 As shown, the display driver circuit includes a video processing module, an EM management module, a power management module, and a GOA management module. It should be noted that... Figure 13The structure described above is merely an example. The display driver circuit may include more or fewer functional modules than those described above, and this application does not limit this.

[0153] It should be noted that the display driving circuit can be used to drive one display area or multiple display areas in the display screen. The following explanation will use the display driving circuit driving the first and second display areas as an example. Those skilled in the art will understand that if the display driving circuit is only used to drive one display area, then the display driving circuit is only used to output the video source signal, EM signal, GOA signal, and power supply voltage signal corresponding to that display area. For simplicity, this will not be elaborated further.

[0154] The video processing module receives video data from the main controller, processes the video data, and generates and outputs a video source signal. The video processing module includes digital circuitry and analog circuitry. As an example, the digital circuitry may include, but is not limited to, frame buffers, a decoder, and a pixel pipeline. The pixel pipeline includes multiple modules for pipelined processing of pixel data, such as a voltage code generator, which can be used for brightness control. The analog processing section includes, but is not limited to, shift registers, data latches, digital-to-analog converters (DACs), and data output buffers.

[0155] It should be noted that when the display driving circuit drives two display areas, the display driving circuit may include a video source output terminal, and use the video output terminal to output the video source signal corresponding to the first display area and the video source signal corresponding to the second display area. Alternatively, the display driving circuit may include two video source output terminals, which are used to output the video source signals of the first display area and the second display area, respectively.

[0156] The EM management module is used to output EM signals to the display screen. Specifically, the EM management module can output a first EM signal corresponding to a first display area and / or output a second EM signal corresponding to a second display area. Within a certain time period, the first EM signal and the second EM signal may have the same or different phases.

[0157] The power management module is used to output ELVDD and ELVSS to the display screen. Optionally, the power management module can output the same ELVDD and ELVSS voltages to different display areas, or it can output different ELVDD and ELVSS voltages to different display areas. For example, the power management module can output a first ELVDD and a first ELVSS corresponding to a first display area, and / or output a second ELVDD and a second ELVSS corresponding to a second display area. In some examples, the power management module may include a power management integrated circuit (PMIC).

[0158] The GOA management module is used to output GOA signals. These GOA signals are used to control the on / off state of the GOA array on the display screen. The GOA management module can output independently varying GOA signals to different display areas. Optionally, the GOA management module can output GOA clock signals with the same phase, voltage value, and on / off state to different display areas, or it can output GOA clock signals with different phases, voltage values, and on / off states to different display areas. As an example, the GOA management module typically outputs a pair of mutually inverted GOA signals to each display area to control the on / off state of the GOA array.

[0159] Optionally, the EM management module can be used to provide independent EM management for each display area. The video processing module can be used to provide independent brightness control for the displayed image in each display area. The power management module can be used to provide independent operating voltage for each display area. The aforementioned GOA management module can be used to provide independent GOA signals for each display area.

[0160] The aforementioned EM management module can use the same hardware to manage the EM of multiple display areas, or it can use different hardware to manage the EM of multiple display areas. Similarly, the video processing module can use the same hardware to control the brightness of multiple display areas, or it can use different hardware to control the brightness of multiple display areas. The power management module can use the same hardware to manage the power supply voltage of multiple display areas, or it can use different hardware to manage the power supply voltage of multiple display areas. The GOA management module can use the same hardware to control the GOA of multiple display areas, or it can use different hardware to control the electrical GOA of multiple display areas.

[0161] When different modules use different hardware to manage each display area, if a certain display area does not display an image, the hardware module corresponding to that display area can be turned off. For example, if the first display area does not display an image, all or some of the hardware modules corresponding to the first display area in the video processing module, EM management module, power management module, and / or GOA management module can be turned off.

[0162] Optionally, the display driving scheme of this application aims to support two or more independent display areas in a display screen. Each independent display area can be completely identical or completely different in terms of pixel density (PPI), pixel arrangement, aperture ratio, pixel current density, and brightness level. Therefore, the display driving system may include two or more independent EM management modules, video processing modules, power management modules, and / or GOA management modules. As an example, the display driving system may include two or more display driving circuits, each controlling an independent display area. The phase, voltage value, and on / off state of the EM signal, ELVDD, ELVSS, and / or GOA clock signal output by each display driving circuit can be the same or different. The image brightness of the display area corresponding to each display driving circuit can be adjusted independently. As another example, the display driving system may also include a display driving circuit, wherein the phase, voltage value, and on / off state of the EM signal, ELVDD, ELVSS and / or GOA clock signal output by the display driving circuit to different display areas may be the same or different, and the display driving circuit may independently adjust the brightness of different display areas.

[0163] Figure 14 This is a timing diagram of the clock signals of a display driving system according to an embodiment of this application. EM1 represents the first EM signal, EM2 represents the second EM signal, ECK represents the EM clock (emission clock, ECK) signal, and GCK represents the gate array clock (GOA clock, GCK) signal. ECK is used to control the EM signals, and GCK is used to control the GOA signals. Figure 14The image also shows the horizontal and vertical scanning directions of the display screen. The horizontal scanning direction represents the scanning direction of each row of subpixels, and the vertical scanning direction represents the scanning direction of the GOA (Gross Orbit). Optionally, to ensure synchronization of the EM1 and EM2 signals during synchronous linear scanning, the two EM signals need to operate in a cascaded architecture. Therefore, the EM management module in the display driver system also needs to provide an ECK signal to implement and guarantee the start-up delay in the cascaded configuration. In the timing design, the ECK and GCK signals can be synchronized in the two display areas to ensure that the GOA clock signal and EM clock signal on each line remain consistent during full-screen display. In this embodiment, the display driver system uses different EM start pulse delay signals for different EM signals. The EM start pulse delay signal is used to control the timing of the EM signal's state switching. For example, the EM signal can only switch from a normal operating state to a closed state, or from a closed state to a normal operating state, when the EM start pulse delay signal is triggered.

[0164] Figure 15 This is a schematic diagram of a brightness control method in a display driving system according to an embodiment of this application. The brightness control can be performed by a voltage code generator. Specifically, the voltage code generator receives pixel data and independent DBV A and DBV B. Based on DBV A, it selects parameters in the gamma LUT corresponding to region A and generates a voltage code for region A on the display screen; and based on DBV B, it selects parameters in the gamma LUT corresponding to region B and generates a voltage code for region B on the display screen. After further processing in the video processing module, the voltage codes generate a video source signal for displaying images on the display screen.

[0165] The voltage code generator can generate voltage codes corresponding to different display areas based on different DBVs and achieve rapid gamma switching between two display areas. Gamma switching refers to the process where, after the scanning of area A ends, area B begins scanning the image based on different brightness correction parameters than area A. Since the update of the gamma adjustment point (i.e., gamma switching) is completed in the digital circuitry, it can be performed over multiple pixel cycles. Optionally, the speed of the voltage code generator's internal pixel clock can be increased to compensate for the time required to insert the gamma voltage adjustment point into the internal pipeline. Additionally, during scanning, a dummy line can be inserted between the two display areas to compensate for the gamma voltage setting time. This dummy line can also be understood as a blank GOA.

[0166] Figures 16 to 25The timing diagram of the display driver system's clock signal under different display states is shown. Next, combined with... Figures 16 to 25 The following describes the display screen driving method according to the embodiments of this application.

[0167] Figure 16 This shows a timing diagram of the image display area switching from region A+B to region A. (See diagram for example.) Figure 16 As shown, EM1 and EM2 signals are used to control whether images are displayed in areas A and B, respectively. The EM1 startpulse signal controls the state switching time of the EM1 signal. Similarly, the EM2 start pulse signal controls the state switching time of the EM2 signal. The source signal is the aforementioned video source signal. The TE signal represents the clock synchronization signal of the display drive system. The V_Sync signal represents the vertical synchronization signal. The MIPI Tx signal represents the instruction sent by the host controller of the electronic device to the DDIC, which instructs the display screen to switch from area A+B to area A. Optionally, in practice, this instruction may include several indication messages related to the switching area.

[0168] For example, by way of example and not limitation, the above instructions include instruction 1 and instruction 2. Instruction 1 is used to instruct the following: (1) The host controller supports sending a black image on region B; (2) By instructing the region mode register to update via the main command, DDIC will switch to region A state at the next vertical synchronization (V-Sync) moment.

[0169] Instruction 2 is used to instruct the following: (1) DDIC bypass in the frame buffer and decoder in region B; (2) DDIC reads the starting column and row address of the first pixel in region A; (3) The main command to write the starting column and row address is received from the main controller and can be supported in the previous or subsequent frames; (4) The source operational amplifier is turned off in region B; (5) The EM1 signal is triggered to a high level (H) by the EM2 start pulse signal.

[0170] like Figure 16As shown, within the time frame of receiving instruction 1, the source signal indicates that region B displays a black screen, thus region B switches to a black screen display. Within the time frame of receiving instruction 2, the EM2 signal switches to a high level to indicate that the pixel circuit of region B is turned off, and simultaneously the display driving system turns off the source signal during the time interval of scanning region B in each time frame. Figure 16 In this embodiment, the display screen can switch from region A+B to region A mode within two time frames. Alternatively, if instruction 1 and instruction 2 can also be sent to the display driver system within the same time frame, the display screen can complete the switching of display state within one time frame. This is also the case in subsequent embodiments. Therefore, this application can achieve rapid switching of the display state of the display screen.

[0171] Figure 17 The diagram shows the timing of the display state switching from area A+B to area B. Figure 17 The definitions and functions of each signal in the code are as follows: Figure 16 The same applies, and will not be repeated here. This is an example, not a limitation. Figure 17 Instruction 1 in the code can be used to instruct the following: (1) The host controller supports sending black screen images on region A; (2) By receiving the master command to instruct the region mode register to be updated, DDIC will switch to region B state at the next vertical synchronization (V-Sync) moment.

[0172] Instruction 2 is used to instruct the following: (1) DDIC bypasses the frame buffer and decoder in region A; (2) DDIC reads the starting column and row address of the first pixel in region B; (3) The main command to write the starting column and row address is received from the main controller and can be supported in the previous or subsequent frames; (4) The source operational amplifier is turned off in region A; (5) The EM2 signal is triggered by the EM1 start pulse signal to be at a high level (H).

[0173] like Figure 17 As shown, within the time frame of receiving instruction 1, the source signal indicates that area A displays a black screen, thus switching area A to a black screen display. Within the time frame of receiving instruction 2, the EM1 signal is converted to a high level to indicate that area A does not display an image, and at the same time, the display drive system turns off the source signal during the time interval of scanning area A in each time frame.

[0174] Figure 18 A timing diagram is shown illustrating the switching of the display state of a screen from region A to region A+B according to an embodiment of this application. Figure 18 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 18 Instruction 1 in the code can be used to instruct the following: (1) By receiving the master command to instruct the region mode register to be updated, the DDIC is converted to region A+B state at the next vertical synchronization (V-Sync) moment; (2) The source channel remains closed in area B.

[0175] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region A; (2) The main command to write the starting column and row address is received from the main controller and can be supported in the previous or subsequent frames; (3) The source begins normal operation at the beginning of region B; (4) EM2 starts to operate normally.

[0176] like Figure 18 As shown, after receiving commands 1 and 2, the EM1 signal remains unchanged, while the EM2 signal changes from high level to normal output after the EM2 start pulse. Area A maintains normal display status, while area B changes from a power-off state to a black screen state, and then back to normal display status.

[0177] Figure 19 This diagram illustrates a timing sequence of the display state switching from region A to region A+B according to another embodiment of this application. Figure 19 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 19 Instruction 1 in the code can be used to instruct the following: (1) By receiving the master command to instruct the region mode register to be updated, the DDIC is converted to region A+B state at the next vertical synchronization (V-Sync) moment; (2) Receive the main command from the main controller to write the starting column and row address; (3) The source channel remains closed in area B.

[0178] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region A; (2) The source begins normal operation at the beginning of region B; (3) EM2 starts to operate normally.

[0179] in, Figure 18 and Figure 19 The switching states of the displays are the same, both switching from area A to area A+B. The difference is that the former sends instruction 1 and instruction 2 separately in two time frames, while the latter sends instruction 1 and instruction 2 in the same time frame. Therefore, the latter can complete the rapid display state switching within a single time frame.

[0180] Figure 20 A timing diagram is shown illustrating the switching of the display state of a screen from region B to region A+B according to an embodiment of this application. Figure 20 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 20 Instruction 1 in the code can be used to instruct the following: (1) By receiving the master command to instruct the region mode register to be updated, the DDIC is converted to region A+B state at the next vertical synchronization (V-Sync) moment; (2) The source channel remains closed in area A.

[0181] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region A; (2) The main command to write the starting column and row address is received from the main controller and can be supported in the previous or subsequent frames; (3) The source begins normal operation at the beginning of region A; (4) EM1 starts to run normally.

[0182] like Figure 20 As shown, after receiving commands 1 and 2, the EM1 signal switches from high level to normal output after the EM1 start pulse, while the EM2 signal remains in normal output mode. Area A switches from a power-off state to a black screen state, and then back to a normal display state. Area B remains in a normal display state.

[0183] Figure 21 This illustration shows a timing diagram of the display state switching from region B to region A+B in another embodiment of this application. Figure 21 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 21 Instruction 1 in the code can be used to instruct the following: (1) By receiving the master command to instruct the region mode register to be updated, the DDIC is converted to region A+B state at the next vertical synchronization (V-Sync) moment; (2) Receive the main command from the main controller to write the starting column and row address; (3) The source channel remains closed in area A.

[0184] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region A; (2) The source begins normal operation at the beginning of region A; (3) The EM1 signal starts to operate normally.

[0185] in, Figure 20 and Figure 21 The switching states of the displays are the same, both switching from area B to area A+B. The difference is that the former sends instruction 1 and instruction 2 separately in two time frames, while the latter sends instruction 1 and instruction 2 in the same time frame. Therefore, the latter can complete the rapid display state switching within a single time frame.

[0186] Figure 22 This diagram illustrates a timing diagram showing the switching of the display state of a screen from region A to region B according to an embodiment of this application. Figure 22 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 22 Instruction 1 in the code can be used to instruct the following: (1) The frame buffer of region A is written with a black screen image before the source is closed; (2) By receiving the master command to instruct the region mode register to be updated, the DDIC will switch to region B state at the next vertical synchronization (V-Sync) moment; (3) The source channel remains closed in region B; (4) The main controller supports sending black screen images in area A.

[0187] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region B; (2) Receive the main command to write the starting column and row address from the main controller, and the main command can be supported in the previous or subsequent frames; (3) The source begins normal operation at the beginning of region B; (4) The source operational amplifier is turned off in region A; (5) The EM2 signal begins to operate normally; (6) The EM1 signal is triggered by the EM1 start pulse signal to be at a high level (H).

[0188] Depend on Figure 22 As can be seen, Command 1 and Command 2 are sent separately within two time frames. After receiving Command 1 and Command 2, the EM1 signal changes from normal output to high level, and the EM2 signal changes from high level to normal output. Area A switches from normal display state to black screen state, and then switches to source-off state. Area B switches from source-off state to black screen state, and then switches to normal display state.

[0189] Figure 23 This illustration shows a timing diagram of the display state switching from region A to region B of a display screen according to another embodiment of this application. Figure 23 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 23 Instruction 1 in the code can be used to instruct the following: (1) The frame buffer of region A is written with a black screen image before the source is closed; (2) By receiving the master command to instruct the region mode register to be updated, the DDIC will switch to region B state at the next vertical synchronization (V-Sync) moment; (3) Receive the main command from the main controller to write the starting column and row address; (4) The source channel remains closed in region B; (5) The main controller supports sending black screen images in area A.

[0190] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region B; (2) The source begins normal operation at the beginning of region B; (3) The source operational amplifier is turned off in region A; (4) The EM2 signal begins to operate normally; (5) The EM1 signal is triggered by the EM1 start pulse signal to be at a high level (H).

[0191] Depend on Figure 23 As can be seen, Command 1 and Command 2 sent by the main controller are sent in the same time frame. Therefore, the display screen can quickly switch display states within one time frame.

[0192] Figure 24 This illustration shows a timing diagram of the display state switching from region B to region A on a display screen according to an embodiment of this application. Figure 24 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 24 Instruction 1 in the code can be used to instruct the following: (1) The frame buffer of region B writes the black screen image before closing the source; (2) By receiving the master command to instruct the region mode register to be updated, DDIC switches to region A state at the next vertical synchronization (V-Sync) moment; (3) The source channel remains closed in area A; (4) The main controller supports sending black screen images in region B.

[0193] Instruction 2 is used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region A; (2) The main command to write the starting column and row address is received from the main controller and can be supported in the previous or subsequent frames; (3) The source begins normal operation at the beginning of region A; (4) The source operational amplifier is turned off in region B; (5) The EM2 signal is triggered by the EM2 start pulse signal to be at a high level (H).

[0194] (6) The EM1 signal starts to operate normally after the delayed start pulse.

[0195] like Figure 24 As shown, Command 1 and Command 2 are sent in different time frames. After receiving Command 1 and Command 2, the EM1 signal changes from high level to normal output, and the EM2 signal changes from normal output to high level. Region A switches from the off-source state to the black screen state, and then switches to the normal display state. Region B switches from the normal display state to the black screen state, and then switches to the off-source state.

[0196] Figure 25 This illustration shows a timing diagram of the display state switching from region B to region A in another embodiment of this application. Figure 25 The definitions and functions of signals in this context can be found in the previous text, and will not be repeated here. This is provided as an example, not a limitation. Figure 25 Instruction 1 in the code can be used to instruct the following: (1) The frame buffer of region B writes the black screen image before closing the source; (2) By receiving the master command to instruct the region mode register to be updated, DDIC switches to region A state at the next vertical synchronization (V-Sync) moment; (3) Receive the main command from the main controller to write the starting column and row address. (4) The source channel remains closed in area A; (5) The main controller supports sending black screen images in region B.

[0197] Instruction 2 can be used to instruct the following: (1) DDIC reads the starting column and row address of the first pixel in region A; (2) The main command to write the starting column and row address is received from the main controller and can be supported in the previous or subsequent frames; (3) The source begins normal operation at the beginning of region A; (4) The source operational amplifier is turned off in region B; (5) The EM2 signal is triggered by the EM2 start pulse signal to be at a high level (H); (6) The EM1 signal starts to operate normally after the delayed start pulse.

[0198] in, Figure 24 and Figure 25 The switching states of the displays are the same, both switching from area B to area A. The difference is that the former sends instruction 1 and instruction 2 separately in two time frames, while the latter sends instruction 1 and instruction 2 in the same time frame. Therefore, the latter can complete the rapid display state switching within a single time frame.

[0199] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in hardware, or a combination of software and hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0200] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0201] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0202] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0203] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0204] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0205] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electronic device, characterized in that, include: The display screen includes a first display area and a second display area; The display driving system includes a first display driving circuit and a second display driving circuit. The first display driving circuit includes a first EM signal output terminal, which is used to send a first EM signal to the display screen. The second display driving circuit includes a second EM signal output terminal, which is used to send a second EM signal to the display screen; The first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period.

2. The electronic device as claimed in claim 1, characterized in that, The first EM signal remains at a first level or transitions between the first level and a second level during the first time period, and the second EM signal remains at the second level during the first time period; Specifically, when the first EM signal is at the first level, the first display area is controlled to emit light; when the first EM signal is at the second level, the first display area is controlled not to emit light. When the second EM signal is at the first level, the second display area is controlled to emit light; when the second EM signal is at the second level, the second display area is controlled not to emit light.

3. The electronic device as described in claim 1 or 2, characterized in that, The first display driving circuit further includes a first video source output terminal, which is used to output a video source signal corresponding to the first display area within a first time interval in the first time frame. The second display driving circuit further includes a second video source output terminal, which is used to: turn off the video source signal corresponding to the second display area within a second time interval in the first time frame, wherein the first time frame belongs to the first time interval.

4. The electronic device as claimed in any one of claims 1 to 3, characterized in that, The first display driving circuit further includes a first video source output terminal, which is used to output a video source signal corresponding to the first display area indicating a black screen in a first time interval in the second time frame. The second time frame is adjacent to and precedes the third time frame. The first EM signal is also used to control the first display area to switch from displaying an image to not displaying an image starting from the third time frame.

5. The electronic device as claimed in any one of claims 1 to 4, characterized in that, The first display driving circuit further includes a first video source output terminal, which is used for: In the first time interval of the fourth time frame, a video source signal corresponding to the black screen indication of the first display area is output. The fourth time frame is adjacent to the fifth time frame and is located before the fifth time frame. The first EM signal is also used to control the first display area to switch from not displaying an image to displaying an image starting from the fourth time frame.

6. The electronic device as claimed in any one of claims 1 to 5, characterized in that, The video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters.

7. The electronic device as claimed in claim 6, characterized in that, The brightness correction parameters include the display brightness vector (DBV).

8. The electronic device as claimed in any one of claims 1 to 7, characterized in that, The first display driving circuit further includes a first light-emitting layer positive voltage ELVDD output terminal, which is used to output a first ELVDD, and the first ELVDD is used to provide a high power supply voltage for the pixel circuit of the first display area; The second display driving circuit also includes a second ELVDD output terminal, which is used to output a second ELVDD. The second ELVDD is used to provide a high power supply voltage to the pixel circuit of the second display area. The voltage values ​​of the first ELVDD and the second ELVDD are different.

9. The electronic device as claimed in any one of claims 1 to 8, characterized in that, The first display driving circuit also includes a first light-emitting layer negative voltage ELVSS output terminal, which is used to output a first ELVSS, which is used to provide a low power supply voltage for the pixel circuit of the first display area. The second display driving circuit also includes a second ELVSS output terminal, which is used to output a second ELVSS. The second ELVSS is used to provide a low power supply voltage for the pixel circuit of the second display area. The voltage values ​​of the first ELVSS and the second ELVSS are different.

10. The electronic device as claimed in any one of claims 1 to 9, characterized in that, The display screen includes a foldable display screen.

11. A display driving system for controlling a display screen, characterized in that, The display screen includes a first display area and a second display area, and the display driving system includes a first display driving circuit and a second display driving circuit. The first display driving circuit includes a first EM signal output terminal, which is used to send a first EM signal to the display screen. The second display driving circuit includes a second EM signal output terminal, which is used to send a second EM signal to the display screen; The first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period.

12. The display driving system as described in claim 11, characterized in that, The first EM signal remains at a first level or transitions between the first level and the second level during the first time period, and the second EM signal remains at the second level during the first time period; Specifically, when the first EM signal is at the first level, the first display area is controlled to emit light; when the first EM signal is at the second level, the first display area is controlled not to emit light. When the second EM signal is at the first level, the second display area is controlled to emit light; when the second EM signal is at the second level, the second display area is controlled not to emit light.

13. The display driving system as described in claim 11 or 12, characterized in that, The first display driving circuit further includes a first video source output terminal, which is used to output a video source signal corresponding to the first display area within a first time interval in the first time frame. The second display driving circuit further includes a second video source output terminal, which is used to turn off the video source signal corresponding to the second display area within a second time interval in the first time frame, wherein the first time frame belongs to the first time interval.

14. The display driving system as described in any one of claims 11 to 13, characterized in that, The first display driving circuit further includes a first video source output terminal, which is used for: Within the first time interval of the second time frame, a video source signal corresponding to the black screen indication of the first display area is output. The second time frame is adjacent to and precedes the third time frame. The first EM signal is also used to control the first display area to switch from displaying an image to not displaying an image starting from the third time frame.

15. The display driving system as described in any one of claims 11 to 14, characterized in that, The first display driving system further includes a first video source output terminal, which is used for: Within the first time interval of the fourth time frame, a video source signal corresponding to the black screen indication of the first display area is output. The fourth time frame is adjacent to and precedes the fifth time frame. The first EM signal is also used to control the first display area to switch from displaying an image to displaying an image starting from the fourth time frame.

16. The display driving system as described in any one of claims 13 to 15, characterized in that, The video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters.

17. The display driving system as described in claim 16, characterized in that, The brightness correction parameters include the display brightness vector (DBV).

18. The display driving system as described in any one of claims 11 to 17, characterized in that, The first display driving circuit further includes a first light-emitting layer positive voltage ELVDD output terminal, which is used to output a first ELVDD, and the first ELVDD is used to provide a high power supply voltage for the pixel circuit of the first display area; The second display driving circuit also includes a second ELVDD output terminal, which is used to output a second ELVDD. The second ELVDD is used to provide a high power supply voltage to the pixel circuit of the second display area. The voltage values ​​of the first ELVDD and the second ELVDD are different.

19. The display driving system as described in any one of claims 11 to 18, characterized in that, The first display driving circuit also includes a first light-emitting layer negative voltage ELVSS output terminal, which is used to output a first ELVSS, which is used to provide a low power supply voltage for the pixel circuit of the first display area. The second display driving circuit also includes a second ELVSS output terminal, which is used to output a second ELVSS. The second ELVSS is used to provide a low power supply voltage for the pixel circuit of the second display area. The voltage values ​​of the first ELVSS and the second ELVSS are different.

20. The display driving system as described in any one of claims 11 to 19, characterized in that, The display screen includes a foldable display screen.

21. A method for driving a display screen, characterized in that, A method applicable to an electronic device according to any one of claims 1 to 10 or a display driving system according to any one of claims 11 to 20, wherein the display screen includes a first display area and a second display area, the method comprising: Send a first luminous EM signal to the display screen; A second EM signal is sent to the display screen, wherein the first EM signal is used to control the first display area to display an image during a first time period, and the second EM signal is used to control the second display area not to display an image during the first time period.

22. The method as described in claim 21, characterized in that, The first EM signal remains at a first level or transitions between the first level and a second level during the first time period, and the second EM signal remains at the second level during the first time period; Specifically, when the first EM signal is at the first level, the first display area is controlled to emit light; when the first EM signal is at the second level, the first display area is controlled not to emit light. When the second EM signal is at the first level, the second display area is controlled to emit light; when the second EM signal is at the second level, the second display area is controlled not to emit light.

23. The method as described in claim 21 or 22, characterized in that, The method further includes: The video source signal corresponding to the first display area is output to the display screen during a first time interval in the first time frame, and the video source signal corresponding to the second display area is turned off during a second time interval in the first time frame, wherein the first time frame belongs to the first time period.

24. The method according to any one of claims 21 to 23, characterized in that, The method further includes: Within a first time interval of the second time frame, a video source signal corresponding to the first display area indicating a black screen is output to the display screen. The second time frame is adjacent to and precedes the third time frame. The first EM signal is also used to control the first display area to switch from displaying an image to not displaying an image starting from the third time frame.

25. The method according to any one of claims 21 to 24, characterized in that, The method further includes: In the first time interval of the fourth time frame, a video source signal corresponding to the first display area indicating a black screen is output to the display screen. The fourth time frame is adjacent to the fifth time frame and is located before the fifth time frame. The first EM signal is also used to control the first display area to switch from not displaying an image to displaying an image starting from the fourth time frame.

26. The method according to any one of claims 21 to 25, characterized in that, The video source signal corresponding to the first display area and the video source signal corresponding to the second display area are generated based on different brightness correction parameters.

27. The method as described in claim 26, characterized in that, The brightness correction parameters include the display brightness vector (DBV).

28. The method according to any one of claims 21 to 27, characterized in that, The method further includes: A first ELVDD is output to the display screen, the first ELVDD being used to provide a high power supply voltage to the pixel circuitry of the first display area; A second ELVDD is output to the display screen. The second ELVDD is used to provide a high power supply voltage to the pixel circuit of the second display area. The voltage values ​​of the first ELVDD and the second ELVDD are different.

29. The method according to any one of claims 21 to 28, characterized in that, The method further includes: A first ELVSS is output to the display screen, the first ELVSS being used to provide a low power supply voltage to the pixel circuitry of the first display area; A second ELVSS is output to the display screen. The second ELVSS is used to provide a low power supply voltage to the pixel circuit of the second display area. The voltage values ​​of the first ELVSS and the second ELVSS are different.

30. The method according to any one of claims 21 to 29, characterized in that, The display screen includes a foldable display screen.

31. A display module, characterized in that, Includes a display screen and a display driving system as described in any one of claims 11 to 20.

Images