Display driving chip, display control method and electronic equipment

Abstract

The invention provides a display driving chip, a display control method and electronic equipment. The display driving chip comprises a refresh content determination circuit and a control signal generation circuit, the refresh content determining circuit is used for determining changed pixels in the image; the control signal generation circuit is used for generating a clock signal based on the changed pixels in the image, and the clock signal is used for closing the electric balance function when the display screen displays the changed pixels in the image and starting the electric balance function when the display screen displays the non-changed pixels in the image; therefore, under the condition that changed pixels exist in one frame of image displayed by the display screen, the time for turning on the electric balance function and the time for turning off the electric balance function exist in the process of displaying the one frame of image by the display screen, so that the purpose of controlling the turning on and turning off of the electric balance function by taking the pixels in the one frame of image as units is achieved. The electric balance function is optimized, and the power consumption of equipment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of display screens, and in particular to a display driver chip, a display control method and an electronic device. Background Art

[0002] At present, the display driver chip of the electronic device reduces the power consumption of the device by turning on the EQ (equalizer) function. Among them, the display driver chip turns on and off the EQ function in units of one frame of image. If the display driver chip determines that the image to be displayed on the display screen is a refresh frame, the EQ function is turned off, and the refresh frame causes the content displayed on the display screen to change; if the image to be displayed by the display driver chip is a hold frame, the EQ function is turned on, and the hold frame causes the content displayed on the display screen to remain unchanged. Although the display driver chip can control the opening and closing of the EQ function in units of one frame of image to be displayed on the display screen, which reduces the power consumption of the device to a certain extent, there is still a problem of high power consumption of the device. Summary of the invention

[0003] The present application provides a display driver chip, a display control method and an electronic device, which further reduces the power consumption of the device by optimizing the EQ function. Some embodiments of the present application provide the following technical solutions:

[0004] In a first aspect, the present application provides a display driver chip, the display driver chip comprising: a refresh content determination circuit and a control signal generation circuit; the refresh content determination circuit is used to determine the pixels that have changed in the image; the control signal generation circuit is used to generate a clock signal based on the pixels that have changed in the image, the clock signal is used to turn off the electric balance function when the display screen displays the pixels that have changed in the image, and turn on the electric balance function when the display screen displays the pixels that have not changed in the image, so that when there are changed pixels in a frame of image displayed by the display screen, there is a time when the electric balance function is turned on and a time when the electric balance function is turned off during the display screen displays a frame of image, so as to realize the control of the on and off of the electric balance function in units of pixels in a frame of image, and optimize the electric balance function compared to the control of the on or off of the electric balance function in units of frames, thereby reducing the power consumption of the device. For example, in some examples, the display driver chip controls the on or off of the electric balance function in units of rows in a frame of image; in some examples, the display driver chip can control the on or off of the electric balance function in units of columns in a frame of image. The display screen displaying a frame of image can also be called the display screen refreshing a frame of image. Furthermore, the turning on and off of the electric balance function can be dynamically changed with the change of the pixels that have changed in the image, so that the control of the electric balance function matches the pixels that have changed in the image, thereby preventing the wrong control of the electric balance function. The pixels that have changed in the image can be the pixels that have changed in a frame of image to be displayed on the display screen relative to the previous frame of image. For example, the frame of image to be displayed is recorded as the first frame of image, and the previous frame of image is the second frame of image. The pixels that have changed in the first frame of image are the pixels in the first frame of image and the second frame of image that have the same position but different pixel values.

[0005] In a possible implementation, the display driver chip also includes: a refresh mode determination circuit, the refresh mode determination circuit is used to determine the refresh mode of the display screen when the display screen displays an image; a control signal generation circuit is used to generate a clock signal based on the full-screen refresh mode when the refresh mode is a global refresh mode, and when the refresh mode is the global refresh mode, the clock signal is used to control the display screen to perform a global refresh and turn off the electric balance function; the control signal generation circuit is used to generate a clock signal based on the local refresh mode and the pixels that have changed in the image when the refresh mode is a local refresh mode, and when the refresh mode is the local refresh mode, the clock signal is used to turn off the electric balance function when the display screen displays the pixels that have changed in the image, and turn on the electric balance function when the display screen displays the pixels that have not changed in the image, so as to achieve the use of an electric balance function control mode that matches the refresh mode during the global refresh and local refresh processes, and there can be a time when the electric balance function is turned on during the local refresh process, so as to achieve the time when the electric balance function is turned on within the time of refreshing a frame of the image, so as to reduce the power consumption of the device by optimizing the electric balance function. And the display screen can use a global refresh after performing at least one local refresh. The global refresh can refresh all pixels in the image displayed on the display screen, thereby reducing or eliminating errors in the content displayed on the display screen due to drift of device characteristics.

[0006] In one possible implementation, the control signal generating circuit is used to determine the start timing of the electric balance function based on the pixels that have changed in the image, and to generate a clock signal based on the start timing of the electric balance function, so that the clock signal can turn off the electric balance function when the display screen displays the pixels that have changed in the image, and turn on the electric balance function when the display screen displays the pixels that have not changed in the image.

[0007] In a possible implementation, the control signal generating circuit is used to determine a first time period in the clock signal corresponding to a pixel that has changed in the image, the first time period being a time when the electric balance function is turned off, and to determine a second time period in the clock signal corresponding to a pixel that has changed in the image, the second time period being a time when the electric balance function is turned on. The first time period in the clock signal corresponding to a pixel that has changed in the image is a time period in which the clock signal controls the display screen to display the pixel that has changed in the image, and the second time period in the clock signal corresponding to a pixel that has changed in the image is a time period in which the clock signal controls the display screen to display the pixel that has not changed in the image, so that the control signal can control the display screen to accurately control the turning on and off of the electric balance function when displaying pixels.

[0008] In a possible implementation, the control signal generating circuit includes: a core controller, a level converter, a switch circuit and an array substrate row driving controller; the core controller is used to generate an electric balance control signal based on pixels that have changed in an image, and the electric balance control signal is used to turn off the electric balance function when the display screen displays pixels that have changed in the image, and turn on the electric balance function when the display screen displays pixels that have not changed in the image; the array substrate row driving controller is used to generate an original clock signal, and the original clock signal does not have an electric balance control function; the level converter is used to generate an intermediate clock signal based on the original clock signal and the electric balance control signal, and convert the intermediate clock signal from a digital signal to an analog signal through the level converter and the switch circuit to obtain a clock signal. Thus, an analog clock signal that can act on the display screen is generated through the core controller, the level converter, the switch circuit and the array substrate row driving controller.

[0009] In a possible implementation, the control signal generating circuit also includes: a video timing controller and a logic combination processor; a video timing controller, used to generate a local refresh reset reference signal according to the global refresh rate and the local refresh rate sent by the core controller, the local refresh reset reference signal including a first control signal and a second control signal, the first control signal is used to control the display screen to perform global refresh, and the second control signal is used to control the display screen to perform local refresh, wherein the proportion of the first control signal and the second control signal in the local refresh reset reference signal is generated based on the local refresh rate and the global refresh rate, and the period of the local refresh reset reference signal is generated based on the global refresh rate; a logic combination processor, used to logically combine the local refresh reset reference signal and the electric balance control signal to generate an electric balance switch signal, the electric balance switch signal is used to turn off the electric balance function during global refresh, and to control the turning on and off of the electric balance function according to the pixels that have changed in the image during local refresh; a level converter, used to generate an intermediate clock signal according to the original clock signal and the electric balance switch signal. Therefore, under the action of a local refresh reset reference signal, the display screen can perform a global refresh and multiple local refreshes, so that all pixels on the display screen can be uniformly refreshed through global refresh after multiple local refreshes, thereby reducing or eliminating errors in the content displayed on the display screen due to drift of device characteristics. In addition, the EQ function can be optimized during the local refresh process, reducing device power consumption.

[0010] In a possible implementation, the display driver chip further includes: a storage controller and a frame buffer; the storage controller is used to receive image data sent by the core controller and store the image data in the frame buffer.

[0011] In one possible implementation, the refresh content determination circuit is a command receiving processor, which receives a control command sent by an application processor in the electronic device, and determines the changed pixels in the image based on the coordinates of the pixels to be refreshed carried in the control command.

[0012] In a second aspect, the present application provides an electronic device, which includes: one or more processors and a display screen; the above-mentioned display driver chip, and the processor controls the display of the display screen through the display driver chip.

[0013] In a third aspect, the present application provides a display control method, the method comprising: determining pixels that have changed in an image; generating a clock signal based on the pixels that have changed in the image, the clock signal being used to turn off the electric balance function when the display screen displays the pixels that have changed in the image, and to turn on the electric balance function when the display screen displays the pixels that have not changed in the image, so that when there are pixels that have changed in a frame of image displayed on the display screen, there is a time when the electric balance function is turned on and a time when the electric balance function is turned off during the process of the display screen displaying a frame of image, thereby realizing the control of the on and off of the electric balance function in units of pixels in a frame of image, and optimizing the electric balance function compared to controlling the on or off of the electric balance function in units of frames, thereby reducing the power consumption of the device. Moreover, the on and off of the electric balance function can change dynamically with the change of the pixels that have changed in the image, so that the control of the electric balance function matches the pixels that have changed in the image, and prevents the wrong control of the electric balance function.

[0014] In a possible implementation, the method further includes: determining a refresh mode of the display screen when the display screen displays an image; generating a clock signal based on the pixels that have changed in the image includes: generating a clock signal based on the full-screen refresh mode when the refresh mode is a global refresh mode, and when the refresh mode is a global refresh mode, the clock signal is used to control the display screen to perform a global refresh and turn off the electric balance function; generating a clock signal based on the local refresh mode and the pixels that have changed in the image when the refresh mode is a local refresh mode, and when the refresh mode is a local refresh mode, the clock signal is used to turn off the electric balance function when the display screen displays the pixels that have changed in the image, and turn on the electric balance function when the display screen displays the pixels that have not changed in the image, so as to achieve that the electric balance function control mode matching the refresh mode is adopted in the global refresh and local refresh processes, and there can be a time for the electric balance function to be turned on during the local refresh process, so as to achieve that there is a time for the electric balance function to be turned on within the time of refreshing a frame of the image, so as to reduce the power consumption of the device by optimizing the electric balance function. And the display screen can adopt a global refresh after performing at least one local refresh, and the global refresh can refresh all pixels in the image displayed by the display screen, thereby reducing or eliminating errors in the content displayed on the display screen due to the drift of device characteristics.

[0015] In one possible implementation, generating a clock signal based on changed pixels in an image includes: determining a start time of an electric balance function based on the changed pixels in the image, and generating a clock signal based on the start time of the electric balance function, so that the clock signal can turn off the electric balance function when the display screen displays the changed pixels in the image, and turn on the electric balance function when the display screen displays the unchanged pixels in the image.

[0016] In a possible implementation, the time period in the clock signal corresponding to the pixels that have changed in the image is the time to turn off the electric balance function, and the time period in the clock signal corresponding to the pixels that have changed in the image is the time to turn on the electric balance function. The first time period in the clock signal corresponding to the pixels that have changed in the image is the time period in which the clock signal controls the display screen to display the pixels that have changed in the image, and the second time period in the clock signal corresponding to the pixels that have changed in the image is the time period in which the clock signal controls the display screen to display the pixels that have not changed in the image, so that the control signal can control the display screen to accurately control the turning on and off of the electric balance function when displaying pixels.

[0017] In a possible implementation, generating a clock signal based on changed pixels in an image includes: generating an electric balance control signal based on the changed pixels in the image, the electric balance control signal being used to turn off an electric balance function when a display screen displays changed pixels in an image, and to turn on an electric balance function when a display screen displays unchanged pixels in an image; generating an original clock signal, the original clock signal not having an electric balance control function; generating an intermediate clock signal based on the original clock signal and the electric balance control signal, and converting the intermediate clock signal from a digital signal to an analog signal to obtain a clock signal.

[0018] In a possible implementation, generating a clock signal based on pixels that have changed in an image also includes: generating a local refresh reset reference signal based on a global refresh rate and a local refresh rate of a display screen, the local refresh reset reference signal including a first control signal and a second control signal, the first control signal being used to control the display screen to perform a global refresh, and the second control signal being used to control the display screen to perform a local refresh, wherein a proportion of the first control signal and the second control signal in the local refresh reset reference signal is generated based on the local refresh rate and the global refresh rate, and a period of the local refresh reset reference signal is generated based on the global refresh rate; logically combining the local refresh reset reference signal and the electric balance control signal to generate an electric balance switch signal, the electric balance switch signal being used to turn off an electric balance function during a global refresh, and to control the turning on and off of the electric balance function according to pixels that have changed in the image during a local refresh; generating an intermediate clock signal based on the original clock signal and the electric balance control signal includes: generating an intermediate clock signal based on the original clock signal and the electric balance switch signal. Therefore, under the action of a local refresh reset reference signal, the display screen can perform a global refresh and multiple local refreshes, so that all pixels on the display screen can be uniformly refreshed through global refresh after multiple local refreshes, thereby reducing or eliminating errors in the content displayed on the display screen due to drift of device characteristics. In addition, the EQ function can be optimized during the local refresh process, reducing device power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a waveform of a clock signal provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a global refresh provided in an embodiment of the present application;

[0021] Figure 3 A waveform diagram of a partial refresh provided in an embodiment of the present application;

[0022] Figure 4 A circuit structure diagram of a display driver chip provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of a waveform generated by a display driver chip provided in an embodiment of the present application;

[0024] Figure 6 Another circuit structure diagram of the display driver chip provided in the embodiment of the present application;

[0025] Figure 7 A schematic diagram of another waveform generated by the display driver chip provided in an embodiment of the present application;

[0026] Figure 8A hardware structure diagram of an electronic device provided in an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of the connection between an AP and a display screen in an electronic device provided in an embodiment of the present application;

[0028] Fig.10 A flow chart of a display control method provided in an embodiment of the present application;

[0029] Fig.11 Another flow chart of the display control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0031] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0032] The multiple involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0033] The display driver integrated circuit (DDIC) can output two clock signals (GCK and GCB) with opposite phases to the gate on array (GOA) circuit in the display screen. The GOA circuit can output a write drive signal under the action of the clock signal, and refresh the content displayed on the display screen under the action of the write drive circuit. The GOA circuit is the row drive circuit of a row of pixels in the pixel array of the display screen. The pixel array is the display area of ​​the display screen, and the row drive circuit is also called a linear controller. Among them, the composition of the clock signal is related to whether the EQ function is turned on. The EQ function refers to adding an intermediate voltage to the signal to complete the transition between the lowest voltage and the highest voltage through the intermediate voltage. Figure 1 As shown in Figure 2, when the EQ function is turned off, the waveform of the clock signal is Figure 1 As shown by the dotted line in , the clock signal includes the lowest voltage (VGLO) and the highest voltage (VGHO); when the EQ function is turned on, the waveform of the clock signal is Figure 1 As shown by the solid line in FIG, the clock signal includes VGLO, VGHO and the intermediate voltage (V EQ ), the transition between the lowest voltage and the highest voltage is completed through the intermediate voltage, thereby reducing the power consumption loss caused by the level flip charging and discharging peak current of the GOA control circuit through the intermediate voltage.

[0034] Assuming that the current generated by the voltage from VGLO to VGHO is I, when the EQ function is turned off, the device power consumption P0 = I*(VGHO-VGLO). When the EQ function is turned on, the current I can be considered unchanged, but it is evenly divided into two sections, and the device power consumption P1 = 1 / 2I*(VGHO-V EQ )+1 / 2I*(V EQ -VGLO), then P0-P1=1 / 2I*(VGHO-VGLO), (P0-P1)>0, so after the EQ function is turned on, the power consumption of the device can be reduced by the intermediate voltage.

[0035] DDIC turns on and off the EQ function in frames. The EQ function is turned off when the display screen refreshes the content, and the EQ function is turned on when the display screen maintains the content unchanged. The display screen can refresh the content in full screen, which means refreshing the pixels of the entire display screen, or the display screen can refresh the content in part, which means refreshing some pixels of the entire display screen.

[0036] The schematic diagram of full screen refresh content is as follows Figure 2As shown, DDIC stores the data displayed on the display screen in a buffer, and the GOA circuit converts the serial clock of DDIC into a sequential write pulse (i.e., write drive signal) with driving capability, reads data from the buffer under the action of the write drive signal and writes the data into the display screen. For example, scanning from the first row of the pixel array to the last row of the pixel array, or scanning from the last row to the first row, each scanned row is controlled by the GOA circuit corresponding to the row to write the data displayed in the row in the buffer into the display screen. Assuming that the display screen includes 12*10 pixels, i.e., 12 rows and 10 columns of pixels, then there are 12 GOA circuits on the display screen side, and the 12 GOA circuits control the data to be written into the display screen in a row-by-row scanning driving mode, and the refresh area is 100%, i.e., all pixels of the entire display screen are refreshed.

[0037] exist Figure 2 In the example, the display content that changes is the heart shape in the middle (a total of 16 pixels, occupying 6 rows), and the display screen can refresh the 6 rows of pixels occupied by the heart shape to achieve partial refresh of the content. For example, the write drive signal of the 6 rows of pixels occupied by the heart shape is valid, while the write drive signal of the other rows of pixels is invalid. When the write drive signal is valid, data can be written to the display screen, and when the write drive signal is invalid, data is prohibited from being written to the display screen, so as to achieve partial refresh of the content through the control of the write drive signal.

[0038] In some examples, DDIC can generate a local refresh action signal, which is used to indicate that a portion of the pixels in the pixel array should be refreshed once. The local refresh action signal can be related to the frame rate of the display screen, and the frame rate of the display screen can be used to control the time interval for refreshing the display screen frame. Assuming that the frame rate of the display screen is 8.3ms (milliseconds), the display screen can be partially refreshed once every 8.3ms using the local refresh action signal, and the position of the pixels refreshed each time in the pixel array can be the same or different, which is not limited in the embodiments of the present application.

[0039] like Figure 3 Partial_act_Y is the partial refresh action signal, Base_Vsync is the basic frame rate synchronization signal, and the period of the basic frame rate synchronization signal is the same as the frame rate of the display. Figure 3The period of Base_Vsync is 8.3ms, and the frame rate of the display screen is 8.3ms. Partial_act_Y is used to indicate that a part of the rows in the pixel array is refreshed once. Assuming that there are Y rows of pixels that need to be partially refreshed, each black pulse in Partial_act_Y indicates that Y rows of pixels have been refreshed once. For example, when the frame rate of the display screen is 8.3ms, the display screen can use Partial_act_Y to partially refresh Y rows of pixels every 8.3ms. Therefore, under the action of Partial_act_Y, the write drive signal can be valid when writing data to the Y row of pixels indicated by Partial_act_Y, and invalid when writing data to other rows of pixels, thereby achieving only one refresh of the Y row of pixels indicated by Partial_act_Y, and realizing partial refresh of the display screen.

[0040] When the display screen is partially refreshed, the display screen can refresh only Y rows of pixels each time, while the other rows that do not need to be refreshed remain unchanged, thus reducing the number of refreshes and the number of refreshes, thereby reducing power consumption. During the global refresh or partial refresh process of the display screen, DDIC can turn on or off the EQ function, where the EQ function is turned on and off in frames, and a frame is the content displayed on the display screen. Figure 3 Taking the partial refresh shown as an example, the display screen performs a partial refresh every 8.3ms. The EQ function is turned off during each partial refresh. Then, when the display screen continues to perform partial refresh, the EQ function is also continuously turned off, which increases the power consumption of the device, especially the driving power consumption of the display screen.

[0041] To address this problem, an embodiment of the present application provides a display driver chip that can control the on and off of the EQ function according to the position to be refreshed in each frame, so that the EQ function can be turned on for a period of time when refreshing a frame. Figure 2 For example, the Figure 2 The positions to be refreshed in the frame shown are the 6 rows of pixels occupied by the heart shape, and the other positions are content maintenance positions. The display driver chip provided by the embodiment of the present application can turn off the EQ function when refreshing the heart shape, and turn on the EQ function while maintaining the content of the area outside the heart shape unchanged, so that the EQ function can be controlled when refreshing the heart shape. Therefore, compared with turning the EQ function on and off in units of frames, the power consumption of the device is reduced, especially the driving power consumption of the display screen, thereby maximizing the benefits of reducing the power consumption of the device by optimizing the EQ function. And when the display driver chip refreshes a frame, it turns off the EQ function at the position to be refreshed in the frame, and turns on the EQ function at the content maintenance position in the frame. Among them, the pixels located at the position to be refreshed are pixels that have changed in the image, such as pixels whose pixel values ​​have changed. Figure 2For example, Figure 2 The 6 rows of pixels occupied by the heart shape are the pixels that have changed in the image.

[0042] Among them, a structure of a display driver chip is as follows Figure 4 As shown, the display driver chip may include: a receiving command processor (RX command processor), a core controller (Core controller), a video timing controller (Videotiming controller), a logic combination processor (Logic combination), a level converter (Levelshifter), a switch (Switch) circuit and a GOA controller (GOA controller). The display driver chip may also include: a memory controller (Memory controller) and a frame buffer (Frame Buffer).

[0043] The RX command processor exchanges data with the processor of the electronic device (such as the application processor (AP)). Specifically, the RX command processor can receive data sent by the processor, and the data sent by the processor includes control data and image data. The image data is used to display on the display screen, and the control data is used to control the display of the display screen. The image data is stored in the Frame Buffer through the Memory controller, and the image data is read from the Frame Buffer through the Memory controller when the display screen is refreshed.

[0044] The control data includes information about the position to be refreshed, the refresh rate, etc. The position to be refreshed is used to indicate the pixels to be refreshed on the display screen. For example, the position to be refreshed is sent through CMD_2Ah and CMD_2Bh, one of CMD_2Ah and CMD_2Bh represents the row coordinate (x-direction coordinate), and the other represents the column coordinate (y-direction coordinate); the refresh rate is used to determine the frame rate of the display screen.

[0045] The RX command processor sends the control data to the Core controller. The Core controller generates an EQ control signal according to the position information to be refreshed. The EQ control signal is used to turn off the EQ function at the position to be refreshed pointed to by the position information to be refreshed. That is, the Core controller can determine the area where the EQ function is turned on and the area where the EQ function is turned off in the EQ control signal according to the position information to be refreshed. The position information to be refreshed points to the position to be refreshed in a frame. That is to say, when the display screen displays a frame, the Core controller determines the area where the EQ function is turned on and the area where the EQ function is turned off in the EQ control signal when displaying the frame according to the position information to be refreshed of the frame.

[0046] The core controller can also send a refresh rate to the video timing controller. The refresh rate includes a global refresh rate and a local refresh rate. The global refresh rate is used to instruct the display screen to perform a global refresh, and the local refresh rate is used to instruct the display screen to perform a local refresh. The video timing controller generates a local refresh reset reference signal according to the global refresh rate and the local refresh rate. The local refresh reset reference signal includes a first control signal and a second control signal. The first control signal is used to control the display screen to perform a global refresh, and the second control signal is used to control the display screen to perform a local refresh. The proportions of the first control signal and the second control signal in the local refresh reset reference signal are generated based on the local refresh rate and the global refresh rate, and the period of the local refresh reset reference signal is generated based on the global refresh rate. For example, if the global refresh rate is 30 Hz and the local refresh rate is 120 Hz, the display screen can be globally refreshed once every 33.3 ms and locally refreshed once every 8.3 ms, so that the period of the local refresh reset reference signal is 33.3 ms, and the duty ratio of the first control signal and the second control signal is 1:3. The corresponding local refresh reset reference signal may include a first control signal and multiple second control signals. Under the action of a local refresh reset reference signal, the display screen can be globally refreshed once and locally refreshed multiple times, so that all pixels on the display screen are uniformly refreshed through global refresh after multiple local refreshes, thereby reducing or eliminating errors in the content displayed on the display screen caused by the drift of device characteristics. Among them, the positions of the first control signal and the second control signal in the local refresh reset reference signal are not limited.

[0047] The core controller sends the EQ control signal to the logic combination, and the video timing controller sends the local refresh reset reference signal to the logic combination. The logic combination performs logical combination processing on the EQ control signal and the local refresh reset reference signal to generate an EQ switch signal. Because all positions of a frame are positions to be refreshed during global refresh, the EQ switch signal turns off the EQ function during global refresh; during local refresh, the EQ switch signal can turn off the EQ function at the positions to be refreshed in the frame, and turn on the EQ function at the content maintenance position in the frame, thereby realizing the control of the EQ function during global refresh and local refresh processes, and there can be a time for the EQ function to be turned on during the local refresh process, so as to reduce or eliminate errors in the content displayed on the display screen due to drift of device characteristics, and further reduce the power consumption of the device.

[0048] Logic combination sends the EQ switch signal to the level shifter. The level shifter also receives the original clock signal sent by the GOA controller. The original clock signal includes two signals with opposite phases, which are recorded as GCK' and GCB'. GCK' and GCB' are generated by the GOA controller after receiving the signal generation instruction from the video timing controller. The signal generation instruction indicates the signal shape of GCK' and GCB'. The GOA controller generates GCK' and GCB' with the signal shape, where GCK' and GCB' are used to control the display screen to refresh. However, GCK' and GCB' do not indicate when the EQ function is turned on and off.

[0049] Level shifter generates an intermediate clock signal based on the EG switch signal and the original clock signal. The intermediate clock signal also includes two signals with opposite phases. Compared with the two signals in the original clock signal, the two signals of the intermediate clock signal instruct the display screen to perform global refresh under the first control signal of the local refresh reset reference signal; instruct the display screen to perform local refresh under the second control signal of the local refresh reset reference signal, and indicate when the EQ function is turned on and off. The original clock signal is a digital signal, which can be composed of 1 and 0. The intermediate clock signal can further complete the digital-to-analog conversion through the Level shifter, such as the low voltage (VGL) in the intermediate clock signal corresponds to the digital 0, and the high voltage (VGH) in the intermediate clock signal corresponds to the digital 1.

[0050] However, the Level shifter does not have the function of assigning an intermediate voltage. The intermediate clock signal can be processed by the Switch circuit, which assigns an intermediate voltage to the intermediate clock signal to generate a clock signal (GCK and GCB) that can act on the GOA circuit at the display end. Under the action of the clock signal, the display screen is controlled to refresh, and the EQ function can be turned on and off when performing a partial refresh, so that the EQ function can be partitioned and turned on or off in units of lines in the same frame. The intermediate voltage can be selected from AVDD, GND and AVEE. In addition, the Switch circuit can further select the highest voltage and the lowest voltage, such as replacing VGL with VGLO and VGH with VGHO. If VGL = VGLO and VGH = VGHO, no replacement is required.

[0051] Combination Figure 5 The waveform diagram generated by some circuits in the display driver chip is shown in the figure. Figure 4 In the figure, Partial_GOA_EQ_ON is the EQ control signal, Partial_rst is the partial refresh reset reference signal, Partial_GOA_EQ_ON_OUT is the EQ switch signal, GCK and GCB are the clock signals sent to the GOA circuit on the display screen. Partial_act_Y is the partial refresh action signal, and Base_Vsync is the basic frame rate synchronization signal. Each black pulse in Partial_act_Y indicates that a refresh has been performed on the Y row of pixels, that is, the black pulse position is the position to be refreshed, and the other positions are the content maintenance positions. When the period of Base_Vsync is 8.3ms, the display screen can use Partial_act_Y to partially refresh the Y row of pixels every 8.3ms.

[0052] At each black pulse position in Partial_act_Y, Partial_GOA_EQ_ON is high level, indicating that the EQ function is turned off, and at other positions Partial_GOA_EQ_ON is low level, indicating that the EQ function is turned on, so that the EQ function of the display screen during partial refresh can be controlled by Partial_GOA_EQ_ON.

[0053] The partial refresh reset reference signal Partial_rst is Figure 5 In the example, a pulse signal is used, the high level of the pulse signal can be used as the first control signal, and the low level of the pulse signal can be used as the second control signal. That is, Partial_rst_H in Partial_rst is the first control signal, and Partial_rst_L is the second control signal. Figure 5In the Partial_rst shown, the duty ratio of Partial_rst_H and Partial_rst_L is 1:3, and the period of Partial_rst is 4 times the period of Base_Vsync (that is, the period of Partial_rst is 33.3ms), so that the display screen can perform three local refreshes after a global refresh. The combination of global refresh and local refresh can reduce power consumption while improving the accuracy of the content displayed on the display screen.

[0054] At Partial_rst_H, Partial_act_Y is invalid, and partial refresh of the display is prohibited. The corresponding Partial_GOA_EQ_ON is also invalid, that is, the EQ function cannot be turned on at Partial_rst_H. Based on this, Partial_GOA_EQ_ON_OUT is low level, indicating that the EQ function is turned off.

[0055] At Partial_rst_L, Partial_act_Y is valid, and the corresponding Partial_GOA_EQ_ON is also valid, so the EQ function can be turned on at Partial_rst_L. Partial_GOA_EQ_ON shows the turning on and off of the EQ function when Partial_act_Y is valid, so Partial_GOA_EQ_ON_OUT can refer to Partial_GOA_EQ_ON to set the high and low levels at Partial_rst_L. Figure 5 When Partial_GOA_EQ_ON is low (EQ function is turned on), Partial_GOA_EQ_ON_OUT is high to turn on the EQ function. When Partial_GOA_EQ_ON is high (EQ function is turned off), Partial_GOA_EQ_ON_OUT is low to turn off the EQ function. Figure 5 When Partial_GOA_EQ_ON_OUT is at a high level, the EQ function is turned on. In some examples, Partial_GOA_EQ_ON_OUT may be at a low level to turn on the EQ function. This embodiment does not limit whether the high level is valid or the low level is valid. The valid here means turning on the EQ function.

[0056] The clock signal generated based on Partial_GOA_EQ_ON_OUT is as follows Figure 5As shown in GCK and GCB in FIG, global refresh is performed at Partial_rst_H, local refresh is performed at Partial_rst_L, and the control of the EQ function is completed through GCK and GCB. For example, global refresh is performed at Frame N (Nth frame), and local refresh is performed at Frame N+1 and Frame N+2. The local refresh is to refresh the Y rows of pixels in Partial_act_Y. When these Y rows of pixels are refreshed, the EQ function is turned off, and the other rows of pixels remain unchanged and the EQ function is turned on. Among them, the duration of the clock signals GCK and GCB is the same as the period of the basic frame rate synchronization signal, as shown in Figure 5 The duration of the clock signals GCK and GCB is 8.3ms. Figure 5 The waveforms of the clock signals GCK and GCB are shown in more detail in FIG. The waveform of the original clock signal is as follows: The waveforms of the clock signals GCK and GCB corresponding to Frame N are the same, the difference between the two is that the original clock signal is a digital signal, and the clock signal is an analog signal.

[0057] Because global refresh is performed at Partial_rst_H and local refresh is performed at Partial_rst_L, each local refresh is performed to refresh Y rows of pixels and Y rows of pixels are also refreshed during global refresh. Therefore, Partial_rst can be used to determine the high refresh area and low refresh area in the pixel array of the display screen. The high refresh area is the Y row of pixels corresponding to Partial_act_Y, and the low refresh area is the pixels other than the high refresh area during global refresh. The schematic diagram of the high refresh area and the low refresh area is as follows Figure 5 As shown in Partial_update_L and Global_update_L in the figure, the dark gray area is the high refresh area, and the light gray area is the low refresh area.

[0058] Through the above Figure 4 and Figure 5 As shown, the display driver chip provided in the embodiment of the present application turns off the EQ function during global refresh; during local refresh, the EQ function can be turned off at the position to be refreshed and the EQ function can be turned on at the content maintenance position, thereby realizing control of the EQ function during the global refresh and local refresh processes, and there can be a time when the EQ function is turned on during the local refresh process, thereby realizing that there is a time when the EQ function is turned on within the time of refreshing a frame of the image, so as to further reduce the power consumption of the device while reducing or eliminating errors in the content displayed on the display screen due to drift of device characteristics.

[0059] Figure 6Another structure of the display driver chip provided in the embodiment of the present application is shown, and the display driver chip may include: RX command processor, core controller, video timing controller, GOA controller, level shifter, switch circuit, memory controller and frame buffer. Figure 4 The difference between the display driver chip shown is that Figure 6 The display driver chip shown describes the EQ function control during the local refresh process. In this control process, the display screen does not perform global refresh. The video timing controller sends a signal generation instruction to the GOA controller. The signal generation instruction indicates the signal shape of GCK' and GCB'. The GOA controller generates an original clock signal. The original clock signal includes GCK' and GCB' with the signal shape. GCK' and GCB' are used to control the display screen to perform local refresh. GCK' and GCB' do not indicate when the EQ function is turned on and off.

[0060] The core controller sends the EQ control signal to the level shifter. The level shifter generates an intermediate clock signal based on the EQ control signal and the original clock signal. The intermediate clock signal includes two signals with opposite phases. Compared with the two signals in the original clock signal, the two signals of the intermediate clock signal indicate that the display screen is partially refreshed and indicate when the EQ function is turned on and off. The original clock signal is a digital signal, which can be composed of 1 and 0. The intermediate clock signal completes the digital-to-analog conversion through the level shifter. For example, the low voltage (VGL) in the intermediate clock signal corresponds to the digital 0, and the high voltage (VGH) in the intermediate clock signal corresponds to the digital 1. The intermediate clock signal can be processed by the switch circuit, and the switch circuit assigns the intermediate voltage to the intermediate clock signal to generate a clock signal (GCK and GCB) that can act on the GOA circuit at the display end. Under the action of the clock signal, the display screen is controlled to be partially refreshed, and the EQ function can be controlled to be turned on and off when the partial refresh is performed, so that the EQ function can be partitioned and turned on or off in units of lines in the same frame time.

[0061] Figure 6 The waveform diagram generated by the display driver chip is shown as follows Figure 7As shown, at each black pulse position in Partial_act_Y (the black pulse position is the position to be refreshed), Partial_GOA_EQ_ON is high level, indicating that the EQ function is turned off, and at other positions (other positions are content maintenance positions), Partial_GOA_EQ_ON is low level, indicating that the EQ function is turned on, so that the EQ function of the display screen is controlled by Partial_GOA_EQ_ON during partial refresh. Then Partial_GOA_EQ_ON is used to generate GCK and GCB in the GOA circuit acting on the display screen end, so that the control of the EQ function during partial refresh is completed through GCK and GCB. For example, when Frame N (Nth frame), Frame N+1 and Frame N+2 are partially refreshed, the Y-row pixels in Partial_act_Y are refreshed and the EQ function is turned off, and the EQ function is turned on while the other rows of pixels remain unchanged. Each time a partial refresh is performed, the Y-row pixels are refreshed, so the area where the Y-row pixels in the display screen are located is a high refresh area, such as Figure 7 As shown in Partial_update_L in the above Figure 6 and Figure 7 As shown, the display driver chip can turn off the EQ function at the position to be refreshed and turn on the EQ function at the content maintenance position during partial refresh, so that the EQ function can be turned on during the partial refresh process, and the EQ function can be turned on during the refresh time of one frame, further reducing the power consumption of the device. In addition, the turning on and off of the EQ function can change dynamically with the change of the position to be refreshed, so that the control of the EQ function matches the position to be refreshed, preventing the wrong control of the EQ function.

[0062] In some examples, the display driver chip provided by the embodiments of the present application may include an RX command processor, a core controller, a GOA controller, a level shifter, a switch circuit, a memory controller, and a frame buffer. Figure 6The difference of the display driver chip shown is that the display driver chip omits the video timing controller, and the core controller sends a signal generation instruction for generating the original clock signal to the GOA controller, so that the GOA controller can generate the original clock signals GCK' and GCB'. The core controller can also send the EQ control signal to the level shifter, and the level shifter generates an intermediate clock signal based on the EQ control signal and the original clock signal. The intermediate clock signal can be processed by the switch circuit to generate a clock signal (GCK and GCB) that can act on the GOA circuit at the display end. Under the action of the clock signal (GCK and GCB), the display screen is controlled to perform partial refresh, and the EQ function can be controlled to be turned on and off during the partial refresh, so that the EQ function can be turned on or off in the same frame time by partition and row unit.

[0063] The display driver chip in each of the above embodiments can enable or disable the EQ function in units of rows during the time of refreshing a frame of image, that is, the display screen turns off the EQ function when displaying at least one row of pixels that have changed in a frame of image, and turns on the EQ function when displaying at least one row of pixels that have not changed in the frame of image. In some examples, the display driver chip can enable or disable the EQ function in units of columns during the time of displaying a frame of image. The principle can be referred to in the above Figures 4 to 7 Regardless of whether the EQ function is based on the row unit of a frame of image or the column unit of a frame of image, the display driver chip can control the opening and closing of the EQ function based on the pixel in a frame of image, so that the EQ function can be turned on during the process of refreshing a frame of image on the display screen to reduce the power consumption of the device.

[0064] In the embodiment of the present application, the above-mentioned display driver chip can be applied to an electronic device, so that during the partial refresh process of the display screen of the electronic device, the EQ function can be turned on and off by the display driver chip. In some embodiments, the electronic device can be a mobile phone, a tablet computer, a desktop computer, a laptop computer, a notebook computer, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a handheld computer, a netbook, a personal digital assistant (Personal Digital Assistant, PDA), a wearable electronic device, a smart watch and other devices. The embodiment of the present application does not specifically limit the specific form of the electronic device.

[0065] like Figure 8As shown, the electronic device may include: a processor, an external memory interface, an internal memory, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, an antenna 1, an antenna 2, a mobile communication module, a wireless communication module, a sensor module, a button, a motor, an indicator, a camera, a display screen, and a subscriber identification module (SIM) card interface, etc. The audio module may include a speaker, a receiver, a microphone, an earphone interface, etc., and the sensor module may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, etc.

[0066] It is to be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device. In other embodiments, the electronic device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0067] The processor may include one or more processing units, for example: the processor may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processor (NPU). Among them, different processing units can be independent devices or integrated into one or more processors. The processor is the nerve center and command center of the electronic device. The controller can generate operation control signals according to the instruction opcode and timing signal to complete the control of fetching and executing instructions.

[0068] The external memory interface can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor through the external memory interface to implement the data storage function. The internal memory can be used to store computer executable program code, which includes instructions. The processor executes various functions of the electronic device and data processing by running the instructions stored in the internal memory.

[0069] The display screen is used to display images, videos, a series of graphical user interfaces (GUI), etc. In some embodiments, the display screen can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light emitting diode or an active-matrix organic light emitting diode (AMOLED), a flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oLed, a quantum dot light emitting diode (QLED), etc. In some embodiments, an electronic device may include one or more display screens.

[0070] In some examples, the display is connected to the processor via a DDIC. Fig. 9 As shown, the AP in the processor is connected to the display screen through the DDIC. The AP can send control data and image data to the DDIC. The control data and image data can be used by the DDIC to generate clock signals (GCK and GCB). Under the action of the clock signal, the display screen can read the image data from the Frame Buffer of the DDIC to control the display screen to refresh under the action of the clock signal. During the partial refresh of a frame of the display screen, the clock signal can also control the opening and closing of the EQ function, so that the EQ function can be opened or closed in units of lines in the same frame.

[0071] Corresponding to the above-mentioned display driver chip, the embodiment of the present application further provides a display control method, the flow chart of which is as follows: Fig.10 As shown, the following steps may be included:

[0072] S101, determining pixels that have changed in an image, wherein the control command sent by the application processor in the electronic device carries the coordinates of the pixels to be refreshed, and the pixels to be refreshed are the pixels that have changed in the image.

[0073] S102. Generate a clock signal based on changed pixels in the image, where the clock signal is used to turn off the EQ function when the display screen displays changed pixels in the image, and to turn on the EQ function when the display screen displays unchanged pixels in the image.

[0074] In a possible implementation, the clock signal is generated by determining the start time of the EQ function based on the pixels that have changed in the image, and generating the clock signal based on the start time of the EQ function. The time period corresponding to the pixels that have changed in the image in the clock signal is the turn-off time of the EQ function, and the time period corresponding to the pixels that have changed in the image in the clock signal is the turn-on time of the EQ function. In this embodiment, the first time period corresponding to the pixels that have changed in the image in the clock signal is the time period in which the clock signal controls the display screen to display the pixels that have changed in the image, and the second time period corresponding to the pixels that have changed in the image in the clock signal is the time period in which the clock signal controls the display screen to display the pixels that have not changed in the image, so that the control signal can control the display screen to accurately control the start and end of the EQ function when displaying pixels, so that the clock signal can turn off the EQ function when the display screen displays the pixels that have changed in the image, and turn on the EQ function when the display screen displays the pixels that have not changed in the image.

[0075] Therefore, when there are pixels that change in a frame of image displayed on the display screen, there are times when the EQ function is turned on and times when the EQ function is turned off during the display screen displaying a frame of image, thereby realizing the control of the EQ function on and off in units of pixels in a frame of image. Compared with controlling the EQ function on or off in units of frames, the EQ function is optimized, thereby reducing the power consumption of the device. Moreover, the turning on and off of the EQ function can change dynamically with the change of pixels in the image, so that the control of the EQ function matches the changed pixels in the image, preventing the erroneous control of the EQ function.

[0076] Fig.11 Another process of the display control method provided in an embodiment of the present application is shown, and the display control method may include the following steps:

[0077] S201, determine the pixels that have changed in the image. Step S201 is the same as step S101, and will not be described again here.

[0078] S202: Determine a refresh mode of the display screen when the display screen displays an image. The refresh mode may be one of a global refresh mode and a local refresh mode.

[0079] S203, when the refresh mode is the global refresh mode, based on the full-screen refresh mode, a clock signal is generated, and when the refresh mode is the global refresh mode, the clock signal is used to control the display screen to perform global refresh and turn off the EQ function.

[0080] S204. When the refresh mode is the local refresh mode, a clock signal is generated based on the local refresh mode and the pixels that have changed in the image. When the refresh mode is the local refresh mode, the clock signal is used to turn off the EQ function when the display screen displays the pixels that have changed in the image, and to turn on the EQ function when the display screen displays the pixels that have not changed in the image.

[0081] In this embodiment, step S203 and step S204 introduce the refresh mode into the clock signal generation process, which is a feasible way to generate the clock signal in step S102. Fig.11 The display control method shown realizes the use of an EQ function control method that matches the refresh method during the global refresh and local refresh process, and the EQ function can be turned on during the local refresh process, so that the EQ function is turned on during the refresh time of a frame of image, so as to reduce the power consumption of the device by optimizing the EQ function. And the display screen can use a global refresh after at least one local refresh, and the global refresh can refresh all pixels in the image displayed on the display screen, thereby reducing or eliminating errors in the content displayed on the display screen due to the drift of device characteristics.

[0082] In addition, in a possible implementation, generating a clock signal based on changed pixels in an image includes: generating an EQ control signal based on changed pixels in the image, the EQ control signal being used to turn off an EQ function when the display screen displays changed pixels in the image, and to turn on the EQ function when the display screen displays unchanged pixels in the image; generating an original clock signal, the original clock signal not having an EQ control function; generating an intermediate clock signal based on the original clock signal and the EQ control signal, and converting the intermediate clock signal from a digital signal to an analog signal to obtain a clock signal.

[0083] In a possible implementation, generating a clock signal based on pixels that have changed in an image also includes: generating a local refresh reset reference signal based on a global refresh rate and a local refresh rate of a display screen, the local refresh reset reference signal including a first control signal and a second control signal, the first control signal being used to control the display screen to perform a global refresh, and the second control signal being used to control the display screen to perform a local refresh, wherein a proportion of the first control signal and the second control signal in the local refresh reset reference signal is generated based on the local refresh rate and the global refresh rate, and a period of the local refresh reset reference signal is generated based on the global refresh rate; logically combining the local refresh reset reference signal and the EQ control signal to generate an EQ switch signal, the EQ switch signal being used to turn off the EQ function during a global refresh, and to control the turning on and off of the EQ function according to pixels that have changed in the image during a local refresh; generating an intermediate clock signal based on the original clock signal and the EQ control signal includes: generating an intermediate clock signal based on the original clock signal and the EQ switch signal. Therefore, under the action of a local refresh reset reference signal, the display screen can perform a global refresh and multiple local refreshes, so that all pixels on the display screen can be uniformly refreshed through global refresh after multiple local refreshes, thereby reducing or eliminating errors in the content displayed on the display screen due to drift of device characteristics. In addition, the EQ function can be optimized during the local refresh process, reducing device power consumption.

[0084] The above clock signal, EQ control signal, EQ switch signal and local refresh reset reference signal can be found in Figures 4 to 7 The relevant instructions in will not be repeated here.

[0085] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display driver chip, characterized in that: The display driver chip includes: a refresh content determination circuit and a control signal generation circuit; The refresh content determination circuit is used to determine pixels that have changed in the image; The control signal generating circuit is used to generate a clock signal based on the pixels that have changed in the image, and the clock signal is used to turn off the electrical balancing function when the display screen displays the pixels that have changed in the image, and to turn on the electrical balancing function when the display screen displays the pixels that have not changed in the image.

2. The display driver chip according to claim 1, characterized in that: The display driver chip further includes: a refresh mode determination circuit, the refresh mode determination circuit being used to determine a refresh mode of the display screen when the display screen displays the image; The control signal generating circuit is used to generate the clock signal based on the full-screen refresh mode when the refresh mode is the global refresh mode, and the clock signal is used to control the display screen to perform global refresh and turn off the electrical balancing function when the refresh mode is the global refresh mode; The control signal generating circuit is used to generate the clock signal based on the local refresh mode and the pixels that have changed in the image when the refresh mode is the local refresh mode. When the refresh mode is the local refresh mode, the clock signal is used to turn off the electrical balance function when the display screen displays the pixels that have changed in the image, and to turn on the electrical balance function when the display screen displays the pixels that have not changed in the image.

3. The display driver chip according to claim 1, characterized in that: The control signal generating circuit is used to determine the start timing of the electric balance function based on the pixels that have changed in the image, and to generate the clock signal based on the start timing of the electric balance function.

4. The display driver chip according to claim 3, characterized in that: The control signal generating circuit is used to determine a first time period in the clock signal corresponding to a pixel that has changed in the image, the first time period being a time when the electrical balance function is turned off, and to determine a second time period in the clock signal corresponding to a pixel that has changed in the image, the second time period being a time when the electrical balance function is turned on.

5. The display driver chip according to claim 1 or 3, characterized in that: The control signal generating circuit comprises: a core controller, a level converter, a switch circuit and an array substrate row driving controller; The core controller is used to generate an electric balance control signal based on the changed pixels in the image, and the electric balance control signal is used to turn off the electric balance function when the display screen displays the changed pixels in the image, and turn on the electric balance function when the display screen displays the unchanged pixels in the image; The array substrate row drive controller is used to generate an original clock signal, and the original clock signal does not have an electrical balance control function; The level converter is used to generate an intermediate clock signal according to the original clock signal and the electrical balance control signal, and convert the intermediate clock signal from a digital signal to an analog signal through the level converter and the switch circuit to obtain the clock signal.

6. The display driver chip according to claim 5, characterized in that: The control signal generating circuit also includes: a video timing controller and a logic combination processor; The video timing controller is used to generate a local refresh reset reference signal according to the global refresh rate and the local refresh rate sent by the core controller, the local refresh reset reference signal includes a first control signal and a second control signal, the first control signal is used to control the display screen to perform global refresh, and the second control signal is used to control the display screen to perform local refresh, wherein the proportion of the first control signal and the second control signal in the local refresh reset reference signal is generated based on the local refresh rate and the global refresh rate, and the period of the local refresh reset reference signal is generated based on the global refresh rate; The logic combination processor is used to logically combine the local refresh reset reference signal and the electric balance control signal to generate an electric balance switch signal, wherein the electric balance switch signal is used to turn off the electric balance function during global refresh, and to control the on and off of the electric balance function according to the pixels that have changed in the image during local refresh; The level converter is used to generate the intermediate clock signal according to the original clock signal and the electrical balance switch signal.

7. The display driver chip according to any one of claims 1 to 6, characterized in that: The refresh content determination circuit is a command receiving processor, which receives a control command sent by an application processor in the electronic device, and determines the changed pixels in the image based on the coordinates of the pixels to be refreshed carried in the control command.

8. An electronic device, characterized in that: The electronic device comprises: one or more processors and a display screen; The display driver chip according to any one of claims 1 to 7, wherein the processor controls the display of the display screen through the display driver chip.

9. A display control method, characterized in that: The method comprises: Determine pixels that have changed in the image; Based on the changed pixels in the image, a clock signal is generated, wherein the clock signal is used to turn off the electrical balance function when the display screen displays the changed pixels in the image, and to turn on the electrical balance function when the display screen displays the unchanged pixels in the image.

10. The method according to claim 9, characterized in that The method further includes: determining a refreshing mode of the display screen when the display screen displays the image; The generating of the clock signal based on the changed pixels in the image includes: generating the clock signal based on the full-screen refresh mode when the refresh mode is a global refresh mode, and the clock signal is used to control the display screen to perform global refresh and turn off the electrical balancing function when the refresh mode is a global refresh mode; When the refresh mode is a local refresh mode, the clock signal is generated based on the local refresh mode and the pixels that have changed in the image. When the refresh mode is the local refresh mode, the clock signal is used to turn off the electrical balance function when the display screen displays the pixels that have changed in the image, and to turn on the electrical balance function when the display screen displays the pixels that have not changed in the image.

11. The method according to claim 9, characterized in that Generating the clock signal based on the changed pixels in the image includes: determining a start time of an electric balance function based on the changed pixels in the image, and generating the clock signal based on the start time of the electric balance function.

12. The method according to claim 11, characterized in that The time period in the clock signal corresponding to the pixels that have changed in the image is a time to turn off the electrical balance function, and the time period in the clock signal corresponding to the pixels that have changed in the image is a time to turn on the electrical balance function.

13. The method according to claim 9 or 11, characterized in that: The generating a clock signal based on the changed pixels in the image comprises: generating an electric balance control signal based on the changed pixels in the image, the electric balance control signal being used to turn off an electric balance function when the display screen displays the changed pixels in the image, and to turn on the electric balance function when the display screen displays the unchanged pixels in the image; generating an original clock signal, wherein the original clock signal does not have an electrical balance control function; An intermediate clock signal is generated according to the original clock signal and the electrical balance control signal, and the intermediate clock signal is converted from a digital signal to an analog signal to obtain the clock signal.

14. The method according to claim 13, characterized in that The generating of the clock signal based on the pixels changed in the image further includes: generating a local refresh reset reference signal according to the global refresh rate and the local refresh rate of the display screen, the local refresh reset reference signal including a first control signal and a second control signal, the first control signal being used to control the display screen to perform a global refresh, and the second control signal being used to control the display screen to perform a local refresh, wherein the proportions of the first control signal and the second control signal in the local refresh reset reference signal are generated based on the local refresh rate and the global refresh rate, and the period of the local refresh reset reference signal is generated based on the global refresh rate; logically combining the local refresh reset reference signal and the electric balance control signal to generate an electric balance switch signal, wherein the electric balance switch signal is used to turn off the electric balance function during global refresh and to control the on and off of the electric balance function according to the pixels that have changed in the image during local refresh; Generating the intermediate clock signal according to the original clock signal and the electrical balance control signal includes: generating the intermediate clock signal according to the original clock signal and the electrical balance switch signal.

Images