CN111613173A - Display driving system, display module, driving method of display screen and electronic device - Google Patents

Abstract

The embodiment of the application provides a display driving system, a driving method of a display screen and electronic equipment, which can improve the flexibility of the design of the display driving system. The electronic device includes: the display screen comprises a first display area and a second display area; the display driving system comprises a first EM signal output end and a second EM signal output end, wherein the first EM signal output end is used for sending a first EM signal to the display screen; the display driving system further comprises a second EM signal output end used for sending a second EM signal to the display screen; the first EM signal is used for controlling the first display area to display the image in the first time period, and the second EM signal is used for controlling the second display area not to display the image in the first time period.

Description

Display driving system, display module, driving method of display screen and electronic device

technical field

The present application relates to the field of terminal technology, and in particular, to a display driving system, a display module, a driving method for a display screen, and an electronic device.

Background technique

With the rapid development of electronic technology, electronic devices such as smart terminals and tablet computers have greatly changed the way people live and work. In order to meet various different demands of users for entertainment, office work, watching videos or browsing web pages, the area of the display screen of electronic devices is designed to be larger and larger. And in order to improve user experience, the same display screen can be divided into multiple display areas, and the multiple display areas in the same display screen can display different images or applications. For example, one display area is used for playing video, and the other display area can be used for presenting a chat interface, so as to meet various needs of users at the same time. And multiple display areas can also be combined to present the same image or video. For example, a folding screen is a typical representative of a display screen that includes multiple display areas. In order to be portable and portable, the screen of the electronic device is designed as a foldable display screen. Users can fold the folding display screen to form a smaller display screen according to different needs, or unfold the folding display screen to form a larger display screen. screen to browse web pages, watch videos and other functions.

However, the display screen with multiple display areas also brings a lot of design difficulties to the design of the display driving system. For example, as the area of the display screen increases and the design complexity of the display driving system increases, the power consumption of the electronic device also increases. How to design a display driving system to reduce the power consumption of electronic devices is an urgent problem to be solved in the industry.

SUMMARY OF THE INVENTION

The present 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 the design of the display driving system.

In a first aspect, an electronic device is provided, including: a display screen, the display screen includes a first display area and a second display area; a display drive system, including a first luminescent EM signal output end, used for displaying to the display The display screen sends a first EM signal; the display driving system further includes a second EM signal output terminal for sending a second EM signal to the display screen; wherein, the first EM signal is used for the first time period. The first display area is controlled to display an image, and the second EM signal is used to control the second display area not to display an image during the first time period.

In the embodiments of the present application, the light-emitting and non-light-emitting states of the pixel circuits in each of the multiple display areas of the display screen are independently controlled by different EM signals, so as to provide independent EM management functions for each display area. Therefore, when no image is displayed in a certain display area, the EM signal can be used to control the display area to not display an image, without the need to always output a video source signal indicating a black screen, thereby improving the flexibility of the display drive system design, and reducing the display screen. The power dissipation of the drive circuit offers the possibility.

With reference to the first aspect, in a possible implementation manner, the first EM signal remains at a first level during the first time period or jumps between the first level and the second level changing, the second EM signal is maintained at the second level during the first period of time; wherein, 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, and when the second EM signal is at the first level When the second EM signal is at the second level, the second display area is controlled not to emit light.

As an example, the first EM signal may be a pulse width modulation (PWM) signal in the first time period.

With reference to the first aspect, in a possible implementation manner, the display driving system further includes a video source output terminal, configured to: output a video corresponding to the first display area in a first time interval in a first time frame and the video source signal corresponding to the second display area is turned off in a second time interval in the first time frame, wherein the first time frame belongs to the first time interval.

In the embodiment of the present application, the display driving system may turn off the video source corresponding to the display area in a corresponding partial time interval in each time frame during a time period in which an image is not displayed in one display area of the plurality of display areas signal, thereby reducing the power consumption of the display drive system.

With reference to the first aspect, in a possible implementation manner, the display driving system further includes a video source output end, configured to: output a video source corresponding to the first time interval in the first time interval in the second time frame A video source signal indicating a black screen in the display area, the second time frame is adjacent to and before the third time frame, wherein the first EM signal is also used to control the first display The region is switched from displaying an image to not displaying an image starting from the third time frame.

In the embodiment of the present application, in order to avoid a blurry screen in the process of switching the display area between the display state and the non-display state, the display driving system may first instruct the display area to display a black screen through a video source signal before the state switching. Then, it is switched to display image state or non-display image state, so as to avoid the phenomenon of blurred screen and improve user experience.

With reference to the first aspect, in a possible implementation manner, the display driving system further includes a video source output terminal, configured to: output a video source corresponding to the first time interval in the fourth time frame within the first time interval. a video source signal indicating a black screen in the display area, the fourth time frame is adjacent to and before the fifth time frame, wherein the first EM signal is also used to control the first display The region switches from not displaying an image to displaying an image starting from the fourth time frame.

In the embodiment of the present application, in order to avoid a blurry screen in the process of switching the display area between the display state and the non-display state, the display driving system may first instruct the display area to display a black screen through a video source signal before the state switching. Then, it is switched to display image state or non-display image state, so as to avoid the phenomenon of blurred screen and improve user experience.

With reference to the first aspect, in a possible implementation manner, 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.

In the embodiment of the present application, different brightness correction parameters can be used to generate video source signals in different display areas, so the brightness of different display areas can be different, thereby improving the design flexibility of the display driving system and improving the user experience.

With reference to the first aspect, in a possible implementation manner, the brightness correction parameter includes a display brightness vector DBV.

With reference to the first aspect, in a possible implementation manner, the display driving system further includes: a first light-emitting layer positive voltage ELVDD output terminal for outputting a first ELVDD, where the first ELVDD is used for the first ELVDD A pixel circuit in a display area provides a high power supply voltage; the second ELVDD output terminal is used for outputting a second ELVDD, the second ELVDD is used for providing a high power supply voltage for the pixel circuit in the second display area, the first ELVDD and the second ELVDD have different voltage values.

In the embodiment of the present application, the display driving system can provide an independent power supply voltage signal for each display area in the plurality of display areas, thereby facilitating the independent management of the power supply voltages of different display areas and improving the flexibility of the design of the display driving system .

With reference to the first aspect, in a possible implementation manner, the display driving system further includes: a first light-emitting layer negative voltage ELVSS output terminal for outputting a first ELVSS, and the first ELVSS is used for the first ELVSS A pixel circuit in a display area provides a low power supply voltage; the second ELVSS output terminal is used for outputting a second ELVSS, the second ELVSS is used for providing a low power supply voltage for the pixel circuit in the second display area, the first The voltage values of ELVSS and the second ELVSS are different.

In the embodiment of the present application, the display driving system can provide an independent power supply voltage signal for each display area in the plurality of display areas, thereby facilitating the independent management of the power supply voltages of different display areas and improving the flexibility of the design of the display driving system .

With reference to the first aspect, in a possible implementation manner, the display driving system includes a first display driving circuit and a second display driving circuit, wherein the first display driving circuit includes the first EM signal output terminal , the second display driving circuit includes the second EM signal output terminal.

With reference to the first aspect, in a possible implementation manner, the display driving system includes a first display driving circuit, and the first display driving circuit includes the first EM signal output terminal and the second EM signal output end.

With reference to the first aspect, in a possible implementation manner, the display screen includes a folding display screen.

In a second aspect, a display driving system is provided for controlling a display screen, the display screen includes a first display area and a second display area, and the display driving system includes: a first light-emitting EM signal output end for sending a first EM signal to the display screen; 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 The first display area displays an image, and the second EM signal is used to control the second display area not to display an image during the first time period.

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, so the beneficial technical effects that can be achieved by the technical solution of the third aspect can be referred to the description of the first aspect, and will not be repeated.

With reference to the second aspect, in a possible implementation manner, the first EM signal remains at a first level or jumps between the first level and the second level during the first period of time , the second EM signal is maintained 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 first level 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 first EM signal is at the first level, the second display area is controlled to emit light. When the two EM signals are at the second level, the second display area is controlled not to emit light.

As an example, the first EM signal may be a PWM signal during the first time period.

With reference to the second aspect, in a possible implementation manner, the display driving system further includes a video source output terminal, configured to: output a video source corresponding to the first display area in a first time interval in the first time frame and the video source signal corresponding to the second display area is turned off in a second time interval in the first time frame, wherein the first time frame belongs to the first time interval.

With reference to the second aspect, in a possible implementation manner, the display driving system further includes a video source output end, configured to: output a video source corresponding to the first time interval in the first time interval in the second time frame A video source signal indicating a black screen in the display area, the second time frame is adjacent to and before the third time frame, wherein the first EM signal is also used to control the first display The region is switched from displaying an image to not displaying an image starting from the third time frame.

With reference to the second aspect, in a possible implementation manner, the display driving system further includes a video source output terminal, configured to: output a video source corresponding to the first time interval in the fourth time frame within the first time interval. a video source signal indicating a black screen in the display area, the fourth time frame is adjacent to and before the fifth time frame, wherein the first EM signal is also used to control the first display The region switches from not displaying an image to displaying an image starting from the fourth time frame.

With reference to the second aspect, in a possible implementation manner, 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.

With reference to the second aspect, in a possible implementation manner, the brightness correction parameter includes a display brightness vector DBV.

With reference to the second aspect, in a possible implementation manner, the display driving system further includes: a first light-emitting layer positive voltage ELVDD output terminal for outputting a first ELVDD, where the first ELVDD is used for the first ELVDD A pixel circuit in a display area provides a high power supply voltage; the second ELVDD output terminal is used for outputting a second ELVDD, the second ELVDD is used for providing a high power supply voltage for the pixel circuit in the second display area, the first ELVDD and the second ELVDD have different voltage values.

With reference to the second aspect, in a possible implementation manner, the display driving system further includes: a first light-emitting layer negative voltage ELVSS output terminal for outputting a first ELVSS, and the first ELVSS is used for the first ELVSS A pixel circuit in a display area provides a low power supply voltage; the second ELVSS output terminal is used for outputting a second ELVSS, the second ELVSS is used for providing a low power supply voltage for the pixel circuit in the second display area, the first The voltage values of ELVSS and the second ELVSS are different.

With reference to the second aspect, in a possible implementation manner, the display driving system includes a first display driving circuit and a second display driving circuit, wherein the first display driving circuit includes the first EM signal output terminal , the second display driving circuit includes the second EM signal output terminal.

With reference to the second aspect, in a possible implementation manner, the display driving system includes a first display driving circuit, and the first display driving circuit includes the first EM signal output terminal and the second EM signal output end.

With reference to the second aspect, in a possible implementation manner, the display screen includes a folding display screen.

In a third aspect, a method for driving a display screen is provided, the display screen includes a first display area and a second display area, the method includes: sending a first luminescent EM signal to the display screen; sending a first luminescent EM signal to the display screen; The screen sends a second EM signal, wherein the first EM signal is used to control the first display area to display an image within a first time period, and the second EM signal is used to control the first time period The second display area does not display images.

It should be understood that the driving method of the display screen of the third aspect and the electronic device of the first aspect are based on the same inventive concept. Therefore, the beneficial technical effects that can be obtained by the technical solution of the third aspect can refer to the description of the first aspect, and no longer Repeat.

With reference to the third aspect, in a possible implementation manner, the first EM signal remains at a first level during the first period of time or jumps between the first level and the second level changing, the second EM signal is maintained at the second level during the first period of time; wherein, 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, and when the second EM signal is at the first level When the second EM signal is at the second level, the second display area is controlled not to emit light.

As an example, the first EM signal may be a PWM signal during the first time period.

With reference to the third aspect, in a possible implementation manner, the method further includes: outputting a video source signal corresponding to the first display area to the display screen within a first time interval in the first time frame, and turning off the video source signal corresponding to the second display area in the second time interval in the first time frame, wherein the first time frame belongs to the first time period.

With reference to the third aspect, in a possible implementation manner, the method further includes: outputting a video indicating a black screen corresponding to the first display area to the display screen within a first time interval in the second time frame source signal, the second time frame is adjacent to and before the third time frame, wherein the first EM signal is also used to control the first display area from the third time frame The frame starts to switch from displaying an image to not displaying an image.

With reference to the third aspect, in a possible implementation manner, the method further includes: outputting a video indicating a black screen corresponding to the first display area to the display screen within a first time interval in a fourth time frame source signal, the fourth time frame is adjacent to and before the fifth time frame, wherein the first EM signal is also used to control the first display area from the fourth time frame The frame starts to switch from not displaying an image to displaying an image.

With reference to the third aspect, in a possible implementation manner, 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.

With reference to the third aspect, in a possible implementation manner, the brightness correction parameter includes a display brightness vector DBV.

With reference to the third aspect, in a possible implementation manner, the method further includes: outputting a first ELVDD to the display screen, where the first ELVDD is used to provide a high power supply for a pixel circuit of the first display area voltage; outputting a second ELVDD to the display screen, the second ELVDD is used to provide a high power supply voltage for the pixel circuit of the second display area, and the voltage values of the first ELVDD and the second ELVDD are different.

With reference to the third aspect, in a possible implementation manner, the method further includes: outputting a first ELVSS to the display screen, where the first ELVSS is used to provide a low power supply for pixel circuits in the first display area voltage; outputting a second ELVSS to the display screen, the second ELVSS is used to provide a low power supply voltage for the pixel circuit of the second display area, and the voltage values of the first ELVSS and the second ELVSS are different.

With reference to the third aspect, in a possible implementation manner, the display screen includes a folding display screen.

In a fourth aspect, a chip is provided, including a processor. The processor is configured to read and execute the computer program stored in the memory, so as to execute the method in the third aspect or any possible implementation manner of the third aspect.

In a fifth aspect, a computer program product is provided, the computer program product includes computer program code, when the computer program code is executed on a computer, the computer program code enables the computer to perform the third aspect or any one of the possible possibilities of the third aspect method in the implementation.

In a sixth aspect, the present application provides a computer-readable storage medium, where computer instructions are stored in the computer-readable storage medium, and when the computer instructions are executed on a computer, the computer is made to execute the third aspect or any one of the third aspects. method in one possible implementation.

In a seventh aspect, the present application provides a display module, the display module comprising a display screen and a display driving system in the second aspect or any possible implementation manner of the second aspect.

Description of drawings

FIG. 1 is a schematic diagram of an expanded state of an electronic device according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a folded state of an electronic device according to an embodiment of the present application.

FIG. 3 is a schematic diagram of a display state of a display screen according to an embodiment of the present application.

FIG. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

FIG. 5 is a schematic circuit diagram of a pixel circuit according to an embodiment of the present application.

FIG. 6 is a schematic circuit diagram of a reset stage of a pixel circuit according to an embodiment of the present application.

FIG. 7 is a schematic circuit diagram of a data voltage Vdata writing stage of a pixel circuit according to an embodiment of the present application.

FIG. 8 is a schematic circuit diagram of a light-emitting stage of a pixel circuit according to an embodiment of the present application.

FIG. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

FIG. 10 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

FIG. 11 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

FIG. 12 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

FIG. 13 is a schematic structural diagram of a display driving system according to an embodiment of the present application.

FIG. 14 is a schematic diagram of a clock signal of a display driving system according to an embodiment of the present application.

FIG. 15 is a schematic diagram of a brightness control method of a display driving system according to an embodiment of the present application.

FIG. 16 is a timing diagram of switching the display state of the folding display screen from the area A+B to the area A according to an embodiment of the present application.

FIG. 17 is a timing diagram of switching the display state of the folding display screen from the area A+B to the area B according to an embodiment of the present application.

FIG. 18 is a timing diagram of switching the display state of the folding display screen from area A to area A+B according to an embodiment of the present application.

FIG. 19 is a timing diagram of switching the display state of the folding display screen from the area A to the area A+B according to another embodiment of the present application.

FIG. 20 is a timing diagram of switching the display state of the folding display screen from the area B to the area A+B according to an embodiment of the present application.

FIG. 21 is a timing diagram of switching the display state of the folding display screen from the area B to the area A+B according to another embodiment of the present application.

FIG. 22 is a timing diagram of switching the display state of the folding display screen from area A to area B according to an embodiment of the present application.

FIG. 23 is a timing chart of switching the display state of the folding display screen from area A to area B according to another embodiment of the present application.

FIG. 24 is a timing diagram of switching the display state of the folding display screen from area B to area A according to an embodiment of the present application.

FIG. 25 is a timing diagram of switching the display state of the folding display screen from area B to area B according to another embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

Embodiments of the present application provide a display driving system, a driving method for a display screen, and an electronic device. Wherein the display screen and the display driving system can be installed in the electronic device.

The electronic devices in the embodiments of the present application may include user equipment, mobile terminals, smart phones, tablet computers (pads), and other electronic devices including display screens, which are not limited in the embodiments of the present application.

The display screen in this application may include a foldable display screen or a non-folding display screen. Taking a folding display screen as an example below, the appearance of an electronic device in an embodiment of the present application will be described with reference to FIG. 1 and FIG. 2 .

FIG. 1 and FIG. 2 are schematic appearance diagrams of an electronic device 100 according to an embodiment of the present application. The electronic device 100 in FIG. 1 is in an unfolded state, and the electronic device 100 in FIG. 2 is in a folded state. As shown in FIG. 1 , 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 , wherein the dotted line shows the boundary line between the first display area 11 and the second display area 12 . In FIG. 1 , 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 may be implemented by a flexible screen. The flexible screen may, for example, include structures such as an organic light-emitting diode (organic light-emitting diode, OLED) display screen, which is not limited in this embodiment of the present application.

As shown in FIG. 2 , when the display screen is in a folded state, the first display area 11 and the second display area 12 are folded away from each other. If the user faces the first display area 11 , the first display area 11 can display an image, and the second display area 12 does not display an image. Alternatively, if the user faces the second display area 12 , the first display area 11 does not display the image, and the second display area 12 displays the image.

It should be understood that the electronic device 100 in FIG. 1 and FIG. 2 is only an example, and the embodiment of the present application does not limit the shape of the electronic device, as long as the display screen includes two or more display areas. In this application, two display areas (11, 12) are taken as an example to introduce the display driving system and the driving method of the display screen. Those skilled in the art can understand that the solutions in the embodiments of the present application are also applicable to electronic devices including more than two display areas, and for the sake of brevity, detailed descriptions are not repeated in the embodiments of the present application.

FIG. 3 is a schematic diagram of a display state of a display screen according to an embodiment of the present application. As shown in FIG. 3 , the display screen 10 may include a first display area 11 and a second display area 12 , and the first display area 11 and the second display area 12 may also be referred to as a first sub-screen and a second sub-screen, respectively. For ease of description, in this embodiment of the present application, 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 a front screen and a back screen, respectively.

Optionally, as shown in (a)-(c) of FIG. 3 , the folding display screen includes three display states. In the first working state (figure a), both area A and area B display images. For example, taking a folding screen as an example, when the folding screen is in an unfolded state, both area A and area B can be used to display images.

In the second working state (Fig. b), the area A does not display the image, and the area B displays the image. For example, taking a folding screen as an example, when the display screen is in a folded state, area B faces the user, and area A faces away from the user. Then area B can be used to display images, while area A does not display images.

In the third display state (Fig. c), the display screen is in a folded state, an image is displayed in area A, and an image is not displayed in area B. For example, taking a folding screen as an example, when the display screen is in a folded state, area A faces the user, and area B faces away from the user. Then area A can display an image, while area B does not display an image.

FIG. 4 is a schematic structural diagram of an electronic device according to another embodiment of the present application. As shown in FIG. 4 , 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 the convenience of description, the definitions of the modules or terms involved in FIG. 4 are described below.

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

Display driving system 120: used for receiving the video data sent from the main controller 110, and performing digital processing and analog processing on the video data through a video processing module to obtain a video source signal. The video source signal is used to output to the display screen 130 to drive the display screen 130 to display images. In addition, the display driving system 120 can also perform EM control management, GOA control management, and power management on the display screen 130 . And output an emission (EM) signal, a positive emission layer VDD (ELVDD), a negative emission layer VSS (ELVSS), and a GOA signal to the display screen. In this embodiment of the present application, the video source signal may also be referred to as a source signal.

Display drive circuit: The display drive system 120 may include one or more display drive circuits, and each display circuit may be a display drive hardware module. In the case where the display drive system 120 includes multiple display drive circuits, multiple display drive circuits Interfaces can exist between 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).

Pixel circuit: It is the smallest circuit unit in the display screen, wherein a pixel circuit is equivalent to a sub-pixel (or sub-pixel) in the display screen circuit, and 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 row by row and emit light. Therefore, when a frame of image is displayed, after the first row of sub-pixels emits light, it needs to keep the light-emitting state until the last row of sub-pixels emits light. Realize the display of a frame of image.

Gate driver on array (GOA): used to provide a gate signal for each row of pixel circuits to control the on or off of each row of pixel circuits. In this embodiment of the present application, the gate drive array may also be referred to as a gate array for short.

In order to facilitate the understanding of the solution of the present application, the following describes the structure and working principle of the pixel circuit in the display screen of the embodiment of the present application with reference to the accompanying drawings. It should be noted that the following description is only used as an example of a pixel circuit rather than a limitation on the protection scope of the present application. According to the solution of the present application, the solution or its modification obtained without creative work by those skilled in the art also falls within the protection scope of the present application.

FIG. 5 is a schematic circuit diagram of a pixel circuit according to an embodiment of the present application. As shown in FIG. 5 , the pixel circuit 50 may include a capacitor Cst, a light emitting device L, and a plurality of transistors ( M1 , M2 , M3 , M4 , M5 , M6 , and M7 ). For the convenience of description, the transistor M1 is called the first reset transistor, the transistor M7 is called the second reset transistor, the transistor M4 is called the driving transistor, the transistor M6 is called the first light-emitting control transistor, and the transistor M5 is called the second light-emitting control transistor . It should be noted that this is just an example of a pixel circuit, and other designs can also be used for the pixel circuit, such as a 2T1C circuit including only 2 transistors and 1 capacitor, a 4T1C circuit including 4 transistors and 1 capacitor, including 5T2C circuits with 5 transistors and 2 capacitors, etc. The design of these pixel circuits can control the on and off of a transistor connected in series with the light-emitting device through the EM signal, so as to realize the control of the light-emitting device. This is not limited in the application examples.

It should be noted that, the above-mentioned light emitting device L may be an organic light emitting diode (organic light emitting diode, OLED). In this case, the display is an OLED display. Alternatively, the light emitting device L may be a micro light emitting diode (mirco light emitting diode, mirco LED). In this case, the display is a mirco LED display. In the following, for the convenience of description, the light-emitting device L is taken as an OLED for illustration.

Based on the structure of the pixel circuit 50 shown in FIG. 5 , the working process of the pixel circuit 50 includes three stages shown in FIGS. 6-8 , the first stage ①, the second stage ② and the third stage ③. In FIG. 6 , FIG. 7 , and FIG. 8 , for the convenience of description, the transistors that are turned off are distinguished by adding “x” marks.

In the first stage ①, under the control of the strobe signal N-1, as shown in FIG. 6, 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. In addition, the initial voltage Vint is transmitted to the anode (anode, a) of the OLED through the second reset transistor M7 to reset 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 Vint.

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, so as to avoid the last image frame remaining on the gate g of the driving transistor M4 and the anode of the OLED The voltage of a affects the next image frame. Therefore, the above-mentioned first stage ① can be called a reset stage.

In the second stage ②, under the control of the strobe signal N, as shown in FIG. 7 , the transistor M2 and the transistor M3 are turned on. When the transistor M3 is turned on, the gate g of the driving transistor M4 is coupled to the drain (drain, d for short), 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 referred to as the data voltage Vdata writing stage of the pixel circuit.

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 turned on. The driving current I generated by the driving transistor M4 is transmitted to the OLED through the above-mentioned current path, so as to drive the OLED to emit light.

Since the OLED emits light in the above-mentioned third stage ③, the above-mentioned third stage ③ can be called a light-emitting stage. It can be seen from the description of the third stage ③ that the EM signal can control the pixel circuit to be in a light-emitting state or a non-light-emitting state.

It should be noted that, Vdata can be understood as a voltage signal corresponding to the pixel circuit in the video source signal output by the display driving system 120 to the display screen. Each pixel circuit corresponds to a different Vdata, and Vdata can be used to control the magnitude of the driving current I, thereby controlling the luminous intensity of the pixel circuit. For example, according to the design of some pixel circuits, the driving current I∝(ELVDD-Vdata) ² . Of course, this is just an example. According to the different pixel circuit designs, 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, and the light-emitting device L does not emit light. In some examples, in a black screen state, the voltage of Vdata may be set to a voltage higher than ELVDD, eg, Vdata=5.3V, ELVDD=4.6V.

It can be seen from the above description that even when the display screen is in a black screen, the display driving system 120 still needs to output the video source signal (ie Vdata) to the display screen all the time, so the display driving system 120 also needs to generate the video source signal, which obviously increases the number of video source signals. The power consumption of the drive system 120 is displayed.

In one time frame when the display screen displays each frame of image, the display driving system 120 outputs the video source signal corresponding to the first display area in the first time interval in the one time frame, and outputs the video source signal corresponding to the first display area in the second time interval in the one time frame The video source signal corresponding to the second display area is output in the interval. For example, in the case where an image is displayed in the first display area of the display screen and no image is displayed in the second display area. The display driving system 120 also needs to output a video source signal indicating a black screen in the second time interval in each time frame, so that the second display area remains in a state of not displaying images, thus increasing the power consumption of the display driving system 120 .

If, in order to save power consumption, the video source signal is directly turned off in the second time interval in each time frame, since the EM signals of the first display area and the second display area are the same, the EM signals will still be controlled during the lighting phase. The second light-emitting control transistor M5 and the first light-emitting control transistor M6 in the above-mentioned pixel circuit are turned on, and the light-emitting device L may also have current flowing, and the second display area may appear blurry, which seriously affects the user experience. Therefore, in the existing solution, it is usually selected to output a video source signal indicating a black screen to the second display area, that is, a Vdata signal that makes the current flowing through the light-emitting device L close to 0.

In order to further reduce the power consumption of the display screen, an embodiment of the present application proposes a driving scheme for a display driving system, in which the display driving system can provide an independent EM for each display area in a plurality of display areas management function, thereby improving the flexibility of the display drive system design and providing the possibility to reduce the power consumption of the display drive circuit.

FIG. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in FIG. 9 , 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, and the display screen 130 may be a folding screen, a non-folding screen, a flexible screen, or a rigid display screen.

The display driving system 120 includes a first EM signal output terminal for sending the first EM signal to the display screen 130 . The display driving system 120 further includes a second EM signal output terminal for sending a second EM signal to the display screen 130 . Wherein, the first EM signal is used to control the first display area to display an image during the first time period, and the second EM signal is used to control the second display area to not display the image during the first time period Displaying an image; and/or, the first EM signal is used to control the first display area not to display an image in a second time period, and the second EM signal is used to control all the images in the second time period The second display area displays an image.

Optionally, the first EM signal is used to control the first display area to display images in a third time period, and the second EM signal is used to control the second display in the third time period area displays the image.

Wherein, the above-mentioned first EM signal and second EM signal may be control signals for controlling the pixel circuit in the display screen to emit light or not to emit light. As an example, the first EM signal and the second EM signal may be the EM signals described in FIGS. 5-8 . 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.

Optionally, the above-mentioned first time period, second time period and/or third time period may include multiple time frames, and the display screen scans one frame of image in each time frame. As an example, the duration of each time frame may be 16.67ms (milliseconds), that is, the refresh rate of the display screen is 60 Hz.

As an example, it is assumed that the EM signal controls the light-emitting device L in the pixel circuit to emit light when the EM signal is at a low level, and controls the light-emitting device L in the pixel circuit to not emit light when the EM signal is at a high level. Phase and Vdata write phase is high, and in the light-emitting phase is low. Therefore, the EM signal in each time frame when an image is displayed on the display screen is a pulse width modulation (pulse width modulation, PWM) signal, that is, the EM signal is in a state of fast switching between high and low levels, which can be referred to as the embodiment of the present application. for the EM signal to be in normal working condition. Since the switching frequency of the EM signal is very fast, based on the phenomenon of persistence of vision of the human eye, the display area is always in a state of displaying an image in the eyes of the human eye. In the case where no image is displayed in the display area, the EM signal is always in a high level state in multiple consecutive time frames, which may be referred to as the EM signal being in an off state in this embodiment of the present application. That is, in the eyes of the human eye, the display area is in a state where no image is displayed.

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

In one example, during the above-mentioned first period of time, the first EM signal is a signal that jumps between a first level and a second level (eg, a PWM signal) or remains at a first level, the The second EM signal remains at the second level. And/or, during the above-mentioned second period of time, the first EM signal is maintained at a first level, and the second EM signal is a signal that jumps between the first level and the second level (eg PWM). signal) or remain at the first level. And/or, in the above-mentioned third time period, both the first EM signal and the second EM signal are signals that jump between the first level and the second level (for example, a PWM signal) or both remain at the first level.

Wherein, when the EM signal is at the first level, it is used to control the light-emitting device in the pixel circuit to emit light, and when the EM signal is at the second level, it is used to control the light-emitting device in the pixel circuit to not emit light. In one example, the first level is a high level, and the second level is a low level. Or, in another example, the first level is a low level, and the second level is a high level.

In the embodiment of the present application, the display driving system 120 controls the first display area 11 and the second display area 12 in the display screen through the mutually independent first EM signal and the second EM signal, so as to provide independent EM for different display areas management functions. During a period of time when no image is displayed in one of the display areas, the EM signal can control the pixel circuits in the display area not to emit light. Taking the description that the pixel circuit in FIG. 8 is in the light-emitting stage as an example, in the time period when the EM signal controls the display area not to display an image, the EM signal can control the second light-emitting control transistor M5 and the first light-emitting control transistor M6 to be non-conductive, Therefore, the path between ELVDD and ELVSS will not be turned on, and no current will flow in the light-emitting device L, so it is not necessary to set the voltage of Vdata to prevent the pixel circuit from emitting light. In other words, by providing an independent EM management function for each display area, the display drive system can turn off the corresponding video source signal during the time period when an image is not displayed in a certain display area, thereby achieving the purpose of saving power consumption.

In the embodiments of the present application, the light-emitting and non-light-emitting states of the pixel circuits in each of the multiple display areas of the display screen are independently controlled by different EM signals, so as to provide independent EM management functions for each display area. Therefore, when no image is displayed in a certain display area, the EM signal can be used to control the display area to not display an image, without the need to always output a video source signal indicating a black screen, thereby improving the flexibility of the display drive system design, and reducing the display screen. The power dissipation of the drive circuit offers the possibility.

The display driving system 120 further includes a video output terminal for outputting a video source signal, and the video source signal is used for driving the display screen to display images.

Optionally, in the case where 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 the corresponding the video source signal in the first display area, and turn off the video source signal corresponding to the second display area in the second time interval in the first time frame, wherein the first time A frame belongs to the first time period.

Similarly, in the case where no image is displayed in the first display area and an image is displayed in the second display area, the video source output end is further configured to: turn off corresponding to the first time interval in the sixth time frame the video source signal of the first display area, and output the video source signal corresponding to the second display area in the sixth time interval in the sixth time frame, wherein the sixth time frame belongs to the second time period.

In the embodiment of the present application, the display driving system may turn off the video source corresponding to the display area in a corresponding partial time interval in each time frame during a time period in which an image is not displayed in one display area of the plurality of display areas signal, thereby reducing the power consumption of the display drive system.

Wherein, turning off the video source signal by the display driving system may include opening the output end of the video source or setting a bias voltage. Optionally, in the corresponding time interval when the video source signal is turned off in each time frame, all or part of the modules in the display driving circuit for processing the corresponding video source signal can also be turned off to reduce power consumption.

The display drive system may include one display drive circuit, or may include multiple display drive circuits, and in the case of including multiple display drive circuits, an interface may exist between the multiple display drive circuits.

As an example, FIG. 10 is a schematic structural diagram of an electronic device according to another embodiment of the present application. The display driving system in FIG. 10 includes a plurality of display driving circuits. As shown in FIG. 10 , 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 for outputting the first EM signal and the first video source signal corresponding to the first display area 11, and the second display driving circuit 1202 is used for outputting the second EM signal signal and the second video source signal corresponding to the second display area 12 . An interface (not shown in FIG. 10 ) may exist between the first display driving circuit 1201 and the second display driving circuit 1202 to facilitate synchronization and interaction among multiple display driving circuits. The working principle of the display driving system in FIG. 10 is the same as or similar to that of the electronic device in FIG. 10 , and details are not repeated here.

Optionally, the display drive system may provide an independent power supply voltage management function for each of the plurality of display areas in the display screen.

FIG. 11 is a schematic structural diagram of an electronic device according to another embodiment of the present application. As shown in FIG. 11 , the display driving system 120 further includes a first emission layer VDD (ELVDD) output terminal for outputting a first ELVDD, and the first ELVDD is used for the first display The pixel circuit in the second display area provides a high power supply voltage; the second ELVDD output terminal is used to output a second ELVDD, and the second ELVDD is used to provide a high power supply voltage for the pixel circuit in the second display area. The first ELVDD and the The voltage values of the second ELVDD may be different. As an example, when the display driving system does not display an image in one of the display areas, the power supply voltage of the display area may be turned off. For example, the first ELVDD may be an operating voltage, and the second ELVDD may be 0, open circuit, or biased to other voltages.

As an example, the first ELVDD and the second ELVDD may include the ELVDD in FIGS. 5-8 .

Continuing to refer to FIG. 11 , the display driving system further includes: a first emission layer VSS (ELVSS) output terminal for outputting a first ELVSS, and the first ELVSS is used for the first display area The pixel circuit provides a low power supply voltage; and a second ELVSS output terminal 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 first ELVSS and all The voltage values of the second ELVSS may be different. For example, the voltage value of the first ELVSS may be 0 or grounded, and the voltage value of the second ELVSS may be open circuit or connected to other bias voltages.

Wherein the first ELVSS and the second ELVSS may include the ELVSS in FIG. 5 to FIG. 8 .

In the embodiment of the present application, the display driving system can provide an independent power supply voltage signal for each display area in the plurality of display areas, thereby facilitating the independent management of the power supply voltages of different display areas and improving the flexibility of the design of the display driving system .

Optionally, the display driving system may further provide independent GOA clock control management for different display areas, and provide mutually independent GOA signals for different display areas. The GOA signal is used to control the on and off of GOA. As an example, the display driving system further includes a first GOA output terminal, the first GOA output terminal is configured to output a first GOA signal corresponding to the first display area to the display screen, and the first GOA signal is used for To control the GOA in the first display area to be turned on or off. The display driving system further includes a second GOA output terminal, the second GOA output terminal is used to output a second GOA signal, and the second GOA signal is used to control the GOA in the second display area to be turned on or off. Wherein, in a period of time, the phase, voltage value or voltage value switching state between the first GOA signal and the second GOA signal may be the same or different.

In the embodiment of the present application, the display driving system can provide an independent GOA clock signal for each display area in the plurality of display areas, so that it is convenient to independently manage the opening and closing of the GOA of different display areas, and the design of the display driving system is improved. flexibility.

FIG. 12 is a schematic structural diagram of an electronic device according to another embodiment of the present application. The display driving system in FIG. 12 includes a plurality of display driving circuits. As shown in FIG. 12 , 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. The working principle of the display driving system in FIG. 12 is the same as or similar to that of the display driving system in FIG. 11 , and details are not repeated here.

In order to avoid a blurry screen when the display area is switched between the display state and the non-display state, the display driving system may first instruct the display area to display a black screen through a video source signal before switching the state, and then switch to the display image state or non-display image state, so as to avoid the phenomenon of blurred screen and improve user experience.

Taking the switching of the display area from displaying an image to not displaying an image as an example, the video source output terminal may first send a video source signal indicating a black screen to the display area within the duration of one time frame or multiple time frames to indicate the display area. A black screen is displayed. And in 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, so as to avoid the occurrence of a blurry screen and improve the user experience. It should be noted that, in the embodiment of the present application, for the human eye, there is no difference between the display area in the black screen state or the source-off state, that is, in the above two states, the display area seen by the human eye is not displayed. image.

In an example, taking the switching of the first display area from displaying an image to a non-displaying state as an example, the video source output end is further configured to: output an image corresponding to the video source in the first time interval in the second time frame A video source signal indicating a black screen in the first display area, the second time frame is adjacent to and before the third time frame, wherein the first EM signal is also used to control the first time frame. A display area is switched from displaying an image to not displaying an image starting from the third time frame.

Taking the display area switching from the non-display state to display the 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 the duration of one time frame or multiple time frames to indicate that the display area is displayed. Black screen. And display the image one or more time frames after the time frame indicating the black screen.

In an example, taking the switching of the first display area from a state of displaying an image to a state of not displaying an image as an example, the video source output terminal is further configured to: output the corresponding image in the first time interval in the fourth time frame. The video source signal indicating the black screen in the first display area, 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 also used to control all The first display area is switched from not displaying an image to displaying an image from the fourth time frame.

Optionally, before outputting the video source signal, the display driving system usually needs to perform luminance processing on the video data. There are usually two ways to perform luminance processing on video data. The first is a pulse width modulation (pulse width modulation, PWM) method, that is, the brightness is adjusted by adjusting the duty cycle of the EM signal. The longer the EM signal controls the light-emitting time of the pixel circuit in one time frame, the higher the display brightness of the display area, and vice versa, the lower the display brightness of the display area. For example, assuming that the length of a time frame is 16ms, the EM signal controls the pixel circuit to emit light within 8ms, and controls the pixel circuit to not emit light within the remaining 8ms. If you want to increase the brightness, you can set the EM signal to control the pixel circuit to emit light within 10ms, and control the pixel circuit to not emit light within the remaining 6ms. In the prior art, since the EM signals of multiple display areas in the display screen are controlled by the same set of EM management modules, the multiple display areas can only use the same brightness control method. However, in the embodiment of the present application, since multiple EM signals are used to independently manage multiple display areas, different display areas can adopt different brightness control modes, which improves user experience. For example, if the user needs to use the first display area to watch videos and use the second display area to browse web pages, the brightness of the two display areas can be adjusted to different brightness.

The second way to modulate the brightness is to adjust according to the voltage and current, that is, the brightness can be adjusted according to the voltage of Vdata. The digital circuit part in the display driving system usually includes a brightness processing module for performing brightness processing on video data. In this embodiment of the present application, the brightness processing module may perform brightness correction on video data in different display areas based on different brightness correction parameters. Therefore, different display areas can adopt different brightness control modes, which improves user experience.

As an example, the OLED display screen usually uses a combination of the above two methods to adjust the brightness of the display area.

It should be noted that luminance processing usually includes gamma correction. Among them, gamma correction refers to a way of adjusting the brightness or contrast of an image. Specifically, in the field of image display, since the human visual system has a roughly logarithmic relationship with the brightness of the display screen, rather than a non-linear relationship, in order to ensure that the image presented by the display screen is the same as the original image, it is necessary to introduce in the display screen Gamma correction, adjust the grayscale curve of the display screen to achieve the best visual effect. The gray scale curve is a characteristic curve indicating the relationship between different gray scales and brightness of the display screen. Among them, gamma correction can be implemented through a gamma lookup table (look uptable, LUT). Gamma LUT can refer to a mapping table of pixel gray values, which can convert the actual sampled pixel gray values through certain transformations, such as threshold, inversion, binarization, contrast adjustment, linear transformation, etc. A corresponding gray value. In this way, the useful information of the image can be highlighted and the contrast of the image can be enhanced.

In the embodiment of the present application, different brightness correction parameters can be used to generate video source signals in different display areas, so the brightness of different display areas can be different, thereby improving the design flexibility of the display driving system and improving the user experience.

Optionally, in this embodiment of the present application, different brightness processing modules may be used to implement the brightness control function of different display areas, or the same brightness processing module may be used to implement the brightness control function of different display areas. The brightness processing module is usually located in the digital circuit part of the display driving system. In one example, the luminance processing module may be a voltage code generator.

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 luminance correction parameters. Optionally, the brightness correction parameter includes a display brightness vector (display brightness vector, DBV).

In the embodiment of the present 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 improving the brightness adjustment of each display area degrees of freedom.

FIG. 13 is a schematic structural diagram of a display driving circuit according to an embodiment of the present application. As shown in FIG. 13 , the display driving circuit includes a video processing module, an EM management module, a power management module and a GOA management module. It should be noted that the structure in FIG. 13 is only used as an example, and the display driving circuit may include more or less functional modules than the above-mentioned modules, which are not limited in this embodiment of the present application.

It should be noted that the display driving circuit can be used to drive one display area in the display screen, and can also be used to drive multiple display areas in the display screen. Next, the display driving circuit driving the first display area and the second display area is used as an example for description. Those skilled in the art can understand that if the display driving circuit is only used to drive one display area in the display screen, the display driving circuit It is only used to output the video source signal, the EM signal, the GOA signal and the power supply voltage signal corresponding to the display area.

The video processing module is used for receiving video data from the main controller, and processing the video data to generate and output a video source signal. The video processing module includes a digital circuit part and an analog circuit part. As examples, the digital circuit portion may include, but is not limited to, frame buffers, decoders, and pixel pipelines. The pixel pipeline includes multiple modules for pipeline processing of pixel data, such as a voltage code generator, which can be used for brightness control. The analog processing part includes but is not limited to modules such as a shifter register, a data latch, a digital analog converter (DAC), and a data output buffer.

It should be noted that when the display driving circuit drives two display areas, the display driving circuit may include one video source output terminal, and use the one video output terminal to output the video corresponding to the first display area The source signal and the video source signal corresponding to the second display area, or the display driving circuit may include two video source output terminals for outputting the video source signals of the first display area and the second display area respectively.

The EM management module is used for outputting EM signals to the display screen. Wherein, the EM management module may output a first EM signal corresponding to the first display area, and/or output a second EM signal corresponding to the second display area. Within a period of time, the phases of the first EM signal and the second EM signal may be the same or different.

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

The GOA management module is used to output the GOA signal. The GOA signal is used to control the opening and closing of the GOA in the display screen. The GOA management module can output GOA signals that vary independently of each other to different display areas. Optionally, the GOA management module can output GOA clock signals with the same phase, voltage value, on state or off state to different display areas, and can also output phase, voltage value, on state or off state to different display areas. Different GOA clock signals. As an example, the GOA management module usually outputs a pair of GOA signals in opposite phases to each display area to control the opening and closing of the GOA array.

Optionally, an 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 functions for the displayed images of each display area. A power management module can be used to provide independent operating voltages for each display area. The above-mentioned GOA management module can be used to provide independent GOA signals for each display area.

The above-mentioned EM management module can use the same hardware to implement the EM management of multiple display areas, and can also use different hardware to implement the EM management of multiple display areas. Similarly, the video processing module may use the same hardware to implement brightness control for multiple display areas, or may use different hardware to implement brightness control for multiple display areas. The power management module may use the same hardware to implement power supply voltage management for multiple display areas, or may use different hardware to implement power supply voltage management for multiple display areas. The GOA management module can use the same hardware to implement GOA control over multiple display areas, or use different hardware to implement electrical GOA control over multiple display areas.

In the case that each of the above modules uses different hardware to manage each display area, if a certain display area does not display an image, the hardware module corresponding to the display area can be turned off. For example, if the first display area does not display an image, all or part of the hardware modules corresponding to the first display area in the video processing module, the EM management module, the power management module and/or the GOA management module may be turned off.

Optionally, in the driving scheme of the display screen of the present application, it is intended to support two or more independent display areas in a display screen, and each independent display area has a pixel density (pixel per inch, PPI), The pixel arrangement, aperture ratio, pixel current density and brightness level can be completely consistent or completely different. Therefore, two or more sets of independent EM management modules, video processing modules, power management modules and/or GOA management modules may be included in the display driving system. As an example, the display driving system may include two or more display driving circuits, each display driving circuit is used to control an independent display area, and each display driving circuit outputs the EM signal, ELVDD, ELVSS and The phase, voltage value, off or on state of the GOA clock signal may or may not be the same. 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, the phase, voltage value, off or The on states can be the same or different, and the display driving circuit can independently adjust the brightness of different display areas.

FIG. 14 is a timing diagram of a clock signal of a display driving system according to an embodiment of the present application. EM1 represents a first EM signal, EM2 represents a second EM signal, ECK represents an EM clock (emission clock, ECK) signal, and GCK represents a gate drive array clock (GOA clock, GCK) signal. Among them, ECK is used to control the EM signal, and GCK is used to control the GOA signal. The horizontal scanning direction and the vertical scanning direction of the image of the display screen are also shown in FIG. 14 . The horizontal scanning direction represents the scanning direction of each row of sub-pixels, and the vertical scanning direction represents the scanning direction of the GOA. Optionally, in order for the EM1 signal and the EM2 signal to be synchronized in a synchronized linear scan, the two EM signals need to operate in a tandem configuration. Therefore, the EM management module in the display drive system also needs to provide the ECK signal to realize and guarantee the start-up delay on the series connection. In timing design, the ECK signal and GCK signal can be synchronized in the two display areas to ensure that the GOA clock signal and EM clock signal on each line are consistent during full screen display. In the embodiments of the present application, the display driving system uses different EM start pulse delay signals for different EM signals. The EM start pulse delay (EM start pulse delay) signal is used to control the state switching time of the EM signal. For example, the EM signal can only switch from the normal operating state to the off state, or from the off state to the normal operating state, only when the EM start pulse delay signal is triggered.

FIG. 15 is a schematic diagram of a brightness control method in a display driving system according to an embodiment of the present application. Among them, the brightness control may be performed by a voltage code generator. Specifically, the voltage code generator receives pixel data and mutually independent DBV A and DBV B, selects parameters in the gamma LUT corresponding to area A based on DBV A, and generates a voltage code for area A in the display screen ; and select parameters in the gamma LUT corresponding to area B based on DBV B, and generate a voltage code in area B in the display screen. After the above-mentioned voltage code undergoes subsequent processing in the video processing module, a video source signal for displaying an image on the display screen is generated.

The voltage code generator can generate voltage codes corresponding to different display areas based on different DBVs, and implement fast gamma switch between the two display areas. The gamma switching may refer to that after the scanning of the area A is completed, the area B starts to continue to scan the image based on the brightness correction parameter different from that of the area A. Among them, since the update of the gamma adjustment point (ie, the gamma switching) is completed in the digital circuit part, the update of the gamma adjustment point can be performed within a plurality of pixel periods. Alternatively, the internal pixel clock speed of the voltage code generator can be increased to compensate for the time the gamma voltage adjustment points are inserted into the internal pipeline. In addition, during the scanning process, a dummy line may be inserted in the middle of the two display areas to compensate for the setting time of the gamma voltage. The above blank line can also be understood as blank GOA.

16 to 25 show timing diagrams of the clock signal of the display driving system in different display states. Next, with reference to FIG. 16 to FIG. 25 , the driving method of the display screen according to the embodiment of the present application will be described.

FIG. 16 shows a timing chart in which the area where the image is displayed is switched from the area A+B to the area A. As shown in Figure 16, the EM1 signal and the EM2 signal are used to control area A and area B to display images or not to display images, respectively. The EM1 start pulse (EM1 startpulse) signal is used to control the state switching time of the EM1 signal. Similarly, the EM2 start pulse (EM2 start pulse) signal is used to control the state switching time of the EM2 signal. The source signal is the above-mentioned video source signal. The TE signal represents the clock synchronization signal of the display drive system. The V_Sync signal represents a vertical synchronization signal. The MIPI Tx signal represents an instruction sent by the host controller of the electronic device to the DDIC, and the instruction is used to instruct the display screen to switch from area A+B to area A. Optionally, in specific practice, the instruction may include several pieces of indication information related to the switching area.

For example, by way of example and not limitation, the above-mentioned instructions include instruction 1 and instruction 2. Among them, instruction 1 is used to indicate the following:

(1) The host controller supports sending a black image on area B;

(2) The region mode register update (region mode register update) is instructed by the main command, and the DDIC transitions to the region A state at the next vertical synchronization (V-Sync) moment.

Instruction 2 is used to indicate the following:

(1) DDIC bypasses the frame buffer and decoder in region B;

(2) The starting column and row address at the first pixel point of the DDIC read area A;

(3) The main command for writing the starting column and row address is received from the main controller, and the main command can be supported in the frame before or after;

(4) The source operational amplifier is turned off in region B;

(5) The EM1 signal is triggered to be a high level (H) by the EM2 start pulse signal.

As shown in FIG. 16 , within the time frame of receiving the instruction 1, the source signal indicates that the area B displays a black screen, so that the area B switches to the black screen display. During the time frame when command 2 is received, the EM2 signal transitions to a high level to instruct to turn off the pixel circuit in area B, and the display driving system turns off the source signal in the time interval of scanning area B in each time frame. In Figure 16, the display screen can switch from zone A+B to zone A mode in two time frames. Or if the instruction 1 and the instruction 2 can also be sent to the display drive system in the same time frame, the display screen can complete the switching of the display state in one time frame, and the same is true in the subsequent embodiments, so this application can achieve Quick switching of the display state of the display.

FIG. 17 is a timing chart showing the switching of the display state of the display screen from the area A+B to the area B. The definitions and functions of each signal in FIG. 17 are the same as those in FIG. 16 , and will not be repeated here. By way of example and not limitation, instruction 1 in Figure 17 may be used to indicate the following:

(1) The host controller supports sending black screen images on area A;

(2) By receiving the master command to instruct the update of the area mode register, the DDIC transitions to the area B state at the next vertical synchronization (V-Sync) moment.

Instruction 2 is used to indicate the following:

(1) DDIC bypasses the frame buffer and decoder in area A;

(2) The starting column and row address at the first pixel point of the DDIC read area B;

(3) The main command for writing the starting column and row address is received from the main controller, and the main command can be supported in the frame before or after;

(4) The source operational amplifier is turned off in region A;

(5) The EM2 signal is triggered to be high level (H) by the EM1 start pulse signal.

As shown in FIG. 17 , within the time frame of receiving the instruction 1, the source signal indicates that the area A displays a black screen, so that the area A switches to the black screen display. During the time frame when command 2 is received, the EM1 signal transitions to a high level to instruct area A to not display an image, and the display drive system turns off the source signal in the time interval of scanning area A in each time frame.

FIG. 18 shows a timing diagram of switching the display state of the display screen from area A to area A+B according to an embodiment of the present application. The definitions and functions of the signals in FIG. 18 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 18 may be used to indicate the following:

(1) By receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area A+B state at the next vertical synchronization (V-Sync) moment;

(2) The source channel remains closed in the B area.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area A;

(2) The main command for writing the starting column and row address is received from the main controller, and the main command can be supported in the previous or following frame;

(3) The source (source) starts to operate normally at the beginning of area B;

(4) EM2 starts to operate normally.

As shown in Figure 18, after receiving command 1 and command 2, the EM1 signal remains unchanged, and the EM2 signal changes from a high level to a normal output after the EM2 start pulse. Area A remains in a normal display state, while area B transitions from a source-off state to a black screen state, and then to a normal display state.

FIG. 19 shows a timing diagram of switching the display state of the display screen from area A to area A+B according to another embodiment of the present application. The definitions and functions of the signals in FIG. 19 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 19 may be used to indicate the following:

(1) By receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area A+B state at the next vertical synchronization (V-Sync) moment;

(2) Receive the main command to write the starting column and row address from the main controller;

(3) The source channel (source channel) remains closed in the B area.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area A;

(2) The source (source) starts to operate normally at the beginning of the area B;

(3) EM2 starts to operate normally.

Among them, the switching states of the display screens in FIG. 18 and FIG. 19 are the same, that is, they are switched from the area A to the area A+B. The difference between the two is that the command 1 and command 2 of the former are sent separately in two time frames, while the command 1 and command 2 of the latter are sent in the same time frame, so the latter can be sent at one time. Fast display state switching is done within the frame.

FIG. 20 shows a timing diagram of switching the display state of the display screen from area B to area A+B according to an embodiment of the present application. The definitions and functions of the signals in FIG. 20 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 20 may be used to indicate the following:

(1) By receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area A+B state at the next vertical synchronization (V-Sync) moment;

(2) The source channel remains closed in the A area.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area A;

(2) The main command for writing the starting column and row address is received from the main controller, and the main command can be supported in the previous or following frame;

(3) The source (source) starts to operate normally at the beginning of area A;

(4) EM1 starts to operate normally.

As shown in Figure 20, after receiving command 1 and command 2, the EM1 signal is switched from a high level to a normal output after the EM1 start pulse, and the EM2 signal remains normal output. Area A switches from the off-source state to the black screen state, and then back to the normal display state. Area B remains in the normal display state.

FIG. 21 shows a timing diagram of switching the display state of the display screen from the area B to the area A+B according to another embodiment of the present application. The definitions and functions of the signals in FIG. 21 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 21 may be used to indicate the following:

(1) By receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area A+B state at the next vertical synchronization (V-Sync) moment;

(2) The main command to write the starting column and row address is received from the main controller;

(3) The source channel remains closed in the A area.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area A;

(2) The source (source) starts to operate normally at the beginning of area A;

(3) The EM1 signal starts to operate normally.

Among them, the switching states of the display screens in FIG. 20 and FIG. 21 are the same, that is, they are switched from the area B to the area A+B. The difference between the two is that the command 1 and command 2 of the former are sent separately in two time frames, while the command 1 and command 2 of the latter are sent in the same time frame, so the latter can be sent at one time. Fast display state switching is done within the frame.

FIG. 22 shows a timing chart of switching the display state of the display screen from area A to area B according to an embodiment of the present application. The definitions and functions of the signals in FIG. 22 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 22 may be used to indicate the following:

(1) The frame buffer of area A writes a black screen image before closing the source;

(2) by receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area B state at the next vertical synchronization (V-Sync) moment;

(3) The source channel remains closed in area B;

(4) The main controller supports sending a black screen image in area A.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area B;

(2) Receive the main command that writes the starting column and row address from the main controller, and can support the main command in the frame before or after;

(3) The source (source) starts to operate normally at the beginning of area B;

(4) The source op amp is turned off in region A;

(5) The EM2 signal starts to operate normally;

(6) The EM1 signal is triggered to be high level (H) by the EM1 start pulse signal.

As can be seen from Figure 22, Command 1 and Command 2 are sent separately in 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 a normal display state to a black screen state, and then switches to a source-off state. The area B is switched from the off-source state to the black screen state, and then to the normal display state.

FIG. 23 shows a timing diagram of switching the display state of the display screen from area A to area B according to another embodiment of the present application. The definitions and functions of the signals in FIG. 23 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 23 may be used to indicate the following:

(1) The frame buffer of area A writes a black screen image before closing the source;

(2) by receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area B state at the next vertical synchronization (V-Sync) moment;

(3) Receive the main command to write the starting column and row address from the main controller;

(4) The source channel remains closed in area B;

(5) The main controller supports sending a black screen image in area A.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area B;

(2) The source (source) starts to operate normally at the beginning of area B;

(3) The source op amp is turned off in region A;

(4) The EM2 signal starts to operate normally;

(5) The EM1 signal is triggered to be high level (H) by the EM1 start pulse signal.

It can be seen from Fig. 23 that the command 1 and the command 2 sent by the main controller are sent in the same time frame, so the display screen can complete the fast display state switching in one time frame.

FIG. 24 shows a timing chart of switching the display state of the display screen from area B to area A according to an embodiment of the present application. The definitions and functions of the signals in FIG. 24 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 24 may be used to indicate the following:

(1) The frame buffer of area B writes a black screen image before closing the source;

(2) by receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area 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 a black screen image in area B.

Instruction 2 is used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area A;

(2) The main command for writing the starting column and row address is received from the main controller, and the main command can be supported in the previous or following frame;

(3) The source (source) starts to operate normally at the beginning of area A;

(4) The source op amp is turned off in region B;

(5) The EM2 signal is triggered to be a high level (H) by the EM2 start pulse signal.

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

As shown in Figure 24, 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. The area A is switched from the off-source state to the black screen state, and then to the normal display state. Area B is switched from a normal display state to a black screen state, and then to a source-off state.

FIG. 25 shows a timing diagram of switching the display state of the display screen from area B to area A according to another embodiment of the present application. The definitions and functions of the signals in FIG. 25 may refer to the foregoing description, which will not be repeated here. By way of example and not limitation, instruction 1 in Figure 25 may be used to indicate the following:

(1) The frame buffer of area B writes a black screen image before closing the source;

(2) by receiving the main command to indicate that the area mode register is updated, the DDIC is converted to the area A state at the next vertical synchronization (V-Sync) moment;

(3) The main command to write the start column and row address is received from the main controller

(4) The source channel remains closed in area A;

(5) The main controller supports sending black screen images in area B.

Instruction 2 can be used to indicate the following:

(1) The starting column and row address at the first pixel point of the DDIC read area A;

(2) The main command for writing the starting column and row address is received from the main controller, and the main command can be supported in the previous or following frame;

(3) The source (source) starts to operate normally at the beginning of area A;

(4) The source op amp is turned off in region B;

(5) The EM2 signal is triggered by the EM2 start pulse signal to be a high level (H);

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

Among them, the switching states of the display screens in FIG. 24 and FIG. 25 are the same, that is, they are switched from the area B to the area A. The difference between the two is that the command 1 and command 2 of the former are sent separately in two time frames, while the command 1 and command 2 of the latter are sent in the same time frame, so the latter can be sent at one time. Fast display state switching is done within the frame.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (35)

1. an electronic device, is characterized in that, comprises: a display screen, the display screen includes a first display area and a second display area; a display drive system, comprising a first luminescent EM signal output terminal for sending a first EM signal to the display screen; The display driving system further includes 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 the first time period, and the second EM signal is used to control the second display area to not display the image during the first time period Display the image. 2. The electronic device of claim 1, wherein the first EM signal is maintained at a first level or between the first and second levels during the first period of time transitions, the second EM signal remains at the second level during the first period of time; 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 not to 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 not to emit light. 3. The electronic device according to claim 1 or 2, wherein the display drive system further comprises a video source output terminal for: outputting a video source signal corresponding to the first display area during a first time interval in a first time frame, and turning off a video source signal corresponding to the second display area during a second time interval in the first time frame The video source signal, wherein the first time frame belongs to the first time period. 4. The electronic device according to any one of claims 1 to 3, wherein the display drive system further comprises a video source output terminal for: outputting a video source signal indicating a black screen corresponding to the first display area within a first time interval in a second time frame, the second time frame being adjacent to and located at the third time frame Before, 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. 5. The electronic device according to any one of claims 1 to 4, wherein the display drive system further comprises a video source output terminal for: outputting a video source signal indicating a black screen corresponding to the first display area within a first time interval in a fourth time frame, the fourth time frame being adjacent to and located at the fifth time frame Before, 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. 6. The electronic device according to any one of claims 1 to 5, wherein the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are based on different generated with the brightness correction parameters. 7. The electronic device of claim 6, wherein the brightness correction parameter comprises a display brightness vector DBV. 8. The electronic device according to any one of claims 1 to 7, wherein the display driving system further comprises: an output terminal of the positive voltage ELVDD of the first light-emitting layer, used for outputting 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 ELVDD output terminal is used to output a second ELVDD, the second ELVDD is used to provide a high power supply voltage for the pixel circuit of the second display area, and the voltage values of the first ELVDD and the second ELVDD are different . 9. The electronic device according to any one of claims 1 to 8, wherein the display driving system further comprises: a first light-emitting layer negative voltage ELVSS output terminal for outputting a first ELVSS, the first An ELVSS is used to provide a low power supply voltage for the pixel circuit of the first display area; The second ELVSS output terminal is used for outputting a second ELVSS, the second ELVSS is used to provide a low power supply voltage for the pixel circuit of the second display area, and the voltage values of the first ELVSS and the second ELVSS are different . 10. The electronic device according to any one of claims 1 to 9, wherein the display driving system comprises a first display driving circuit and a second display driving circuit, wherein the first display driving circuit comprises The first EM signal output terminal and the second display driving circuit include the second EM signal output terminal. 11. The electronic device according to any one of claims 1 to 9, wherein the display driving system comprises a first display driving circuit, and the first display driving circuit comprises the first EM signal output terminal and the second EM signal output. 12. The electronic device of any one of claims 1 to 11, wherein the display screen comprises a folding display screen. 13. A display drive system for controlling a display screen, wherein the display screen comprises a first display area and a second display area, and the display drive circuit comprises: a first light-emitting EM signal output terminal, used for sending a first EM signal to the display screen; The second EM signal output terminal is used to send the 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 the first time period, and the second EM signal is used to control the second display area to not display the image during the first time period Display the image. 14. The display driving system of claim 13, wherein the first EM signal is maintained at a first level or between the first level and the second level during the first period of time transitions, the second EM signal remains at the second level during the first period of time; 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 not to 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 not to emit light. 15. The display driving system according to claim 13 or 14, wherein the display driving system further comprises a video source output terminal for: outputting a video source signal corresponding to the first display area during a first time interval in a first time frame, and turning off a video source signal corresponding to the second display area during a second time interval in the first time frame The video source signal, wherein the first time frame belongs to the first time period. 16. The display driving system according to any one of claims 13 to 15, wherein the display driving system further comprises a video source output terminal for: outputting a video source signal indicating a black screen corresponding to the first display area within the first time interval in a second time frame, the second time frame being adjacent to and located at the third time frame Before the time frame, 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. 17. The display driving system according to any one of claims 13 to 16, wherein the display driving system further comprises a video source output terminal for: A video source signal indicating a black screen corresponding to the first display area is output within the first time interval in a fourth time frame, the fourth time frame being adjacent to and located at the fifth time frame Before the 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. 18. The display drive system according to any one of claims 15 to 17, wherein the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are based on . generated with different luminance correction parameters. 19. The display driving system of claim 18, wherein the brightness correction parameter comprises a display brightness vector DBV. 20. The display driving system according to any one of claims 13 to 19, wherein the display driving system further comprises: an output terminal of the positive voltage ELVDD of the first light-emitting layer, used for outputting 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 ELVDD output terminal is used to output a second ELVDD, the second ELVDD is used to provide a high power supply voltage for the pixel circuit of the second display area, and the voltage values of the first ELVDD and the second ELVDD are different . 21. The display driving system according to any one of claims 13 to 20, further comprising: a first light-emitting layer negative voltage ELVSS output terminal for outputting a first ELVSS, wherein the first ELVSS is used for providing a low power supply voltage for the pixel circuit of the first display area; The second ELVSS output terminal is used for outputting a second ELVSS, the second ELVSS is used to provide a low power supply voltage for the pixel circuit of the second display area, and the voltage values of the first ELVSS and the second ELVSS are different . 22. The display driving system according to any one of claims 13 to 21, wherein the display driving system comprises a first display driving circuit and a second display driving circuit, wherein the first display driving circuit The first EM signal output terminal is included, and the second display driving circuit includes the second EM signal output terminal. 23. The display driving system according to any one of claims 13 to 21, wherein the display driving system comprises a first display driving circuit, and the first display driving circuit comprises the first EM signal output terminal and the second EM signal output terminal. 24. The display drive system of any one of claims 13 to 23, wherein the display screen comprises a folding display screen. 25. A method for driving a display screen, wherein the display screen comprises a first display area and a second display area, the method comprising: sending a first luminescent 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 within a first time period, and the second EM signal is used to display an image in the first time period The second display area is controlled not to display an image within a time period. 26. The method of claim 25, wherein the first EM signal is maintained at a first level or between the first and second levels for the first period of time transition, 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 not to 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 not to emit light. 27. The method of claim 25 or 26, wherein the method further comprises: Outputting a video source signal corresponding to the first display area to the display screen during a first time interval in a first time frame, and turning off a video source signal corresponding to the first display area during a second time interval in the first time frame The video source signal of the second display area, wherein the first time frame belongs to the first time period. 28. The method of any one of claims 25 to 27, wherein the method further comprises: A video source signal indicating a black screen corresponding to the first display area is output to the display screen within a first time interval in a second time frame, the second time frame being adjacent to the third time frame and located in the 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 not displaying an image starting from the third time frame. 29. The method of any one of claims 25 to 28, wherein the method further comprises: A video source signal indicating a black screen corresponding to the first display area is output to the display screen within a first time interval in a fourth time frame, the fourth time frame being adjacent to the fifth time frame and located in the Before the fifth time frame, the first EM signal is further used to control the first display area to switch from not displaying an image to displaying an image from the fourth time frame. 30. The method of any one of claims 25 to 29, wherein the video source signal corresponding to the first display area and the video source signal corresponding to the second display area are based on different The brightness correction parameters are generated. 31. The method of claim 30, wherein the luminance correction parameter comprises a display luminance vector DBV. 32. The method of any one of claims 25 to 31, wherein the method further comprises: outputting a first ELVDD to the display screen, where the first ELVDD is used to provide a high power supply voltage for pixel circuits in 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 for the pixel circuit of the second display area, and the voltage values of the first ELVDD and the second ELVDD are different. 33. The method of any one of claims 25 to 32, wherein the method further comprises: outputting a first ELVSS to the display screen, where the first ELVSS is used to provide a low power supply voltage for pixel circuits in the first display area; A second ELVSS is output to the display screen, where the second ELVSS is used to provide a low power supply voltage for pixel circuits in the second display area, and the voltage values of the first ELVSS and the second ELVSS are different. 34. The method of any one of claims 25 to 33, wherein the display screen comprises a folding display screen. 35. A display module, characterized by comprising a display screen and the display driving system according to any one of claims 13 to 24.

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