Display device, backlight brightness control method and main control chip

Abstract

The embodiment of the invention belongs to the display technology, and provides a display device, a backlight brightness control method and a main control chip, the display device comprises a backlight, a driving chip and the main control chip; the main control chip obtains brightness data and a synchronizing signal of an image to be displayed; driving information is determined according to the brightness data, the driving information comprises black frame insertion data, first brightness data of the backlight source in a first brightness duration and second brightness data of the backlight source in a second brightness duration, the first brightness data comprises first backlight brightness, and the second brightness data comprises second backlight brightness; the second backlight brightness is equal to the average brightness of the backlight source in the brightness duration of the black frame and the first brightness duration; and sending the black frame insertion data, the first brightness data and the second brightness data to the driving chip at the first moment, the second moment and the third moment in sequence according to the synchronizing signal, so that the driving chip drives the backlight source, and the backlight flicker phenomenon generated by inserting the black frame in the variable refresh rate mode is avoided.

Description

Technical Field

[0001] This application relates to display technology. More specifically, it relates to a display device, a backlight brightness control method, and a main control chip. Background Technology

[0002] Variable Refresh Rate (VRR) and Variable Refresh Rate (BFI) are two important technologies in LCD displays used to improve image quality and viewing experience. VRR technology allows the display device to dynamically adjust the refresh rate based on the frame rate of the content, enhancing smoothness. BFI technology eliminates motion blur, providing users with a clearer and smoother visual experience.

[0003] However, when using the BFI function in VRR mode, the conflict between VRR technology (which requires dynamic adjustment of the refresh rate) and BFI technology (which requires inserting black frames at a fixed refresh rate) causes the backlight to fail to adjust its brightness correctly, resulting in backlight flickering. Summary of the Invention

[0004] This application provides a display device, a backlight brightness control method, and a main control chip, which can be used to solve the problem of backlight flickering when the display device performs the BFI function in VRR mode in related technologies.

[0005] In a first aspect, embodiments of this application provide a display device, the display device comprising:

[0006] LCD screens are used to display images;

[0007] A backlight is used to emit backlight to illuminate the liquid crystal display screen;

[0008] A driver chip, connected to the backlight, is used to drive the backlight to emit backlight;

[0009] The main control chip is connected to the driver chip and is used to send driving information to the driver chip, so that the driver chip drives the backlight to emit backlight according to the received driving information.

[0010] The main control chip is configured as follows:

[0011] When the display device is in variable refresh rate mode and black frame insertion function is enabled, the brightness data and synchronization signal of the image to be displayed are acquired.

[0012] The driving information of the image to be displayed is determined based on the brightness data. The driving information includes: black frame insertion data for inserting black frames into the image to be displayed, first brightness data of the backlight within a first brightness duration and second brightness data within a second brightness duration after inserting the black frame, wherein the first brightness data includes the first backlight brightness of the backlight, the second brightness data includes the second backlight brightness of the backlight, and the second backlight brightness is equal to the average brightness of the backlight within the brightness duration of the black frame and the first brightness duration.

[0013] According to the synchronization signal, the black frame insertion data, the first brightness data and the second brightness data are sent to the driver chip in sequence at the first time, the second time and the third time.

[0014] The driver chip is configured as follows:

[0015] At the first time point, the second time point, and the third time point, the black frame insertion data, the first brightness data, and the second brightness data are received sequentially. The backlight is driven to turn off during the brightness duration of the inserted black frame according to the black frame insertion data, to emit backlight at the first backlight brightness during the first brightness duration according to the first brightness data, and to emit backlight at the second backlight brightness during the second brightness duration according to the second brightness data.

[0016] Secondly, embodiments of this application provide a backlight brightness control method, the method comprising:

[0017] When the display device is in variable refresh rate mode and black frame insertion function is enabled, acquire the brightness data and synchronization signal of the image to be displayed;

[0018] The driving information of the image to be displayed is determined based on the brightness data. The driving information includes: black frame insertion data for inserting black frames into the image to be displayed, first brightness data of the backlight within a first brightness duration and second brightness data within a second brightness duration after inserting the black frame, wherein the first brightness data includes the first backlight brightness of the backlight, the second brightness data includes the second backlight brightness of the backlight, and the second backlight brightness is equal to the average brightness of the backlight within the brightness duration of the black frame and the first brightness duration.

[0019] According to the synchronization signal, the black frame insertion data, the first brightness data, and the second brightness data are sent to the driver chip sequentially at the first time, the second time, and the third time. This causes the driver chip to drive the backlight to turn off the backlight during the brightness duration of the inserted black frame according to the black frame insertion data, to drive the backlight to emit backlight at the first backlight brightness during the first brightness duration according to the first brightness data, and to drive the backlight to emit backlight at the second backlight brightness during the second brightness duration according to the second brightness data.

[0020] Thirdly, embodiments of this application provide a main control chip, which is used to execute the method described in the second aspect.

[0021] This application provides a display device, a backlight brightness control method, and a main control chip. The display device includes: a liquid crystal display screen for displaying images, a backlight emitting backlight to illuminate the liquid crystal display screen, a driver chip driving the backlight to emit backlight, and a main control chip. The main control chip sends driving information to the driver chip, causing the driver chip to drive the backlight to emit backlight according to the received driving information. The main control chip is configured to: when the display device is in a variable refresh rate mode and a black frame insertion function is enabled, acquire brightness data and a synchronization signal of the image to be displayed, and determine driving information for the image to be displayed based on the brightness data. The driving information includes: black frame insertion data for inserting black frames into the image to be displayed, first brightness data of the backlight within a first brightness duration after black frame insertion, and second brightness data within a second brightness duration. The first brightness data includes the first backlight brightness of the backlight, and the second brightness data includes the second backlight brightness of the backlight. The second backlight brightness is equal to the average brightness of the backlight within the black frame brightness duration and the first brightness duration. According to the synchronization signal, black frame insertion data, first brightness data, and second brightness data are sent to the driver chip sequentially at the first, second, and third moments. This causes the driver chip to drive the backlight to turn off during the brightness duration of the inserted black frame according to the black frame insertion data, to emit backlight at the first backlight brightness during the first brightness duration according to the first brightness data, and to emit backlight at the second backlight brightness during the second brightness duration according to the second brightness data. In this application, for display devices in variable refresh rate mode, for each frame (i.e., within one cycle of the synchronization signal), the second backlight brightness of the backlight during the second brightness duration is adjusted to make it equal to the average brightness during the black frame brightness duration and the first brightness duration. That is, the brightness of the backlight remains constant within the same cycle, thus adapting to frequency changes and effectively preventing backlight flickering during black frame insertion. Attached Figure Description

[0022] To more clearly illustrate the implementation methods in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of BFI principle provided for an embodiment of this application;

[0024] Figure 2 This is a schematic diagram illustrating the principle of local dimming.

[0025] Figure 3 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0026] Figure 4 A schematic diagram illustrating the correspondence between synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 1 ;

[0027] Figure 5 A schematic diagram illustrating the correspondence between synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 2 ;

[0028] Figure 6 A schematic diagram illustrating the correspondence between synchronization signals, sub-synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 1 ;

[0029] Figure 7 A schematic diagram illustrating the correspondence between synchronization signals, sub-synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 2 ;

[0030] Figure 8 This is a schematic diagram of a screen display effect provided in an embodiment of this application;

[0031] Figure 9 A flowchart illustrating a backlight brightness control method provided in this application;

[0032] Figure 10 This is a schematic diagram of a backlight brightness control device provided in this application. Detailed Implementation

[0033] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0034] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0035] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0036] Variable Refresh Rate (VRR) technology dynamically adjusts the refresh rate, allowing the display to match the frame rate of the currently displayed content, resulting in a smoother gaming and video playback experience. Ideally, the display's refresh rate and frame rate would always match, but this isn't always the case. If a game has a frame rate of 50fps, and the display's refresh rate is 60Hz, some frames will need to be refreshed repeatedly, causing the display to show two different frames simultaneously, resulting in stuttering. Displays supporting VRR technology dynamically match the refresh rate and frame rate, keeping them synchronized and reducing latency, thus delivering better image quality.

[0037] Variable Refresh Rate (BFI) technology reduces motion blur by inserting a black frame between every two frames, making moving images clearer and more natural. Figure 1 A schematic diagram of BFI principle provided in this application embodiment, referencing... Figure 1 As shown, the BFI function is divided into three segments, with the dark, bold rectangle indicating backlight illumination. When the image changes from the second frame to the third frame, the liquid crystal molecules flip, resulting in a response time and a time difference between each line of input data. If the backlight is fully illuminated, the displayed image exhibits a trailing effect. Therefore, a black frame can be inserted between two frames, turning off the backlight before the liquid crystal flips and turning it on after the liquid crystal reaches the target value. By utilizing the BFI function to illuminate the backlight in both time and space according to the moment the liquid crystal rotates to the target value, the trailing effect can be effectively mitigated. Its advantage lies in cleverly inserting a black frame within the existing response time of liquid crystals, leveraging the persistence of vision in the human eye and the display principle of liquid crystal images, thereby eliminating the liquid crystal's ghosting effect.

[0038] However, when VRR and BFI technologies work together, i.e. when BFI is used in VRR mode, the conflict between VRR and BFI technologies in their working principles causes the backlight to be unable to adjust its brightness correctly, resulting in unstable display effects and backlight flickering. VRR technology needs to dynamically adjust the refresh rate according to the video content, while BFI technology requires a fixed refresh rate to insert black frames.

[0039] Based on this, this application provides a display device, a backlight brightness control method, and a main control chip. When the display device is in a variable refresh rate mode and the black frame insertion function is enabled, the driving information determined based on the brightness data is divided into multiple data segments: black frame insertion data for inserting black frames, first brightness data of the backlight within a first brightness duration, and second brightness data within a second brightness duration. The first brightness data includes a first backlight brightness, and the second brightness data includes a second backlight brightness. For each frame, by controlling the second backlight brightness of the backlight within the second brightness duration, the second backlight brightness is made equal to the average brightness of the backlight within the black frame brightness duration and the first brightness duration. That is, the brightness of the backlight remains constant within one cycle, thereby effectively preventing backlight flickering when inserting black frames.

[0040] Figure 2 This is a schematic diagram illustrating the principle of local dimming. (Reference) Figure 2 As shown, the display device includes an image processing module, a backlight driving module, and a liquid crystal display module.

[0041] The image processing module's frame rate conversion chip acquires image data of the image to be displayed, processes the image data, and performs grayscale distribution statistics on the processed image data to obtain the brightness value of each zone. Based on the brightness value of each zone and a pre-stored backlight optical model, image grayscale compensation is performed on the image data, and the compensated image data is sent to the timing controller so that the timing controller can drive the LCD panel.

[0042] Simultaneously, the frame rate conversion chip sends the brightness value of each zone to the main control chip. The main control chip processes the brightness value of each zone to obtain backlight data, and then sends the backlight data to the driver chip. The driver chip drives the backlight source to emit backlight based on the backlight data.

[0043] The technical solution of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0044] Figure 3 This is a schematic diagram of the structure of a display device provided in an embodiment of this application, with reference to... Figure 3 As shown, the display device includes:

[0045] LCD screen 301 is used to display images;

[0046] Backlight 302 is used to emit backlight to illuminate the liquid crystal display screen 301;

[0047] The driver chip 303 is connected to the backlight 302 and is used to drive the backlight 302 to emit backlight;

[0048] The main control chip 304 is connected to the driver chip 303 and is used to send driving information to the driver chip 303, so that the driver chip 303 drives the backlight 302 to emit backlight according to the received driving information.

[0049] The main control chip 304 is configured as follows:

[0050] When the display device is in variable refresh rate mode and black frame insertion function is enabled, the brightness data and synchronization signal of the image to be displayed are acquired.

[0051] The driving information of the image to be displayed is determined based on the brightness data. The driving information includes: black frame insertion data for inserting black frames into the image to be displayed, first brightness data of the backlight 302 within a first brightness duration after inserting the black frame, and second brightness data within a second brightness duration. The first brightness data includes the first backlight brightness of the backlight 302, and the second brightness data includes the second backlight brightness of the backlight 302. The second backlight brightness is equal to the average brightness of the backlight 302 within the brightness duration of the black frame and the first brightness duration.

[0052] According to the synchronization signal, the black frame insertion data, the first brightness data and the second brightness data are sent to the driver chip 303 in sequence at the first time, the second time and the third time.

[0053] The driver chip 303 is configured as follows:

[0054] The system receives the black frame insertion data, the first brightness data, and the second brightness data sequentially at the first time point, the second time point, and the third time point. Based on the black frame insertion data, the system drives the backlight 302 to turn off the backlight during the brightness duration of the inserted black frame, based on the first brightness data, the system drives the backlight 302 to emit backlight at the first backlight brightness during the first brightness duration, and based on the second brightness data, the system drives the backlight 302 to emit backlight at the second backlight brightness during the second brightness duration.

[0055] In one implementation scenario, the backlight 302 is composed of multiple LED or Mini LED light-emitting devices, used to emit backlight to illuminate the liquid crystal display screen 301, thereby enabling the liquid crystal display screen 301 to display images normally.

[0056] The brightness data of the image to be displayed can include the brightness values ​​of multiple zones within the image. The sync signal (VSYNC) is a pulse signal applied between two frames of the image to indicate the end of the previous frame and the beginning of the new frame. Because the display device is in variable refresh rate mode, the frequency of the sync signal may differ between different frames. For example, the sync signal frequency for the first frame might be 144Hz, the second frame 100Hz, and the third frame 120Hz, etc.

[0057] In one implementation scenario, for a display device that supports black frame insertion, the black frame insertion data can be a black frame insertion instruction, which causes the driver chip 303 to turn off the backlight before the liquid crystal flips.

[0058] In another implementation scenario, for display devices that do not support black frame insertion, the black frame insertion data may include black frame brightness data. The black frame brightness data includes the black frame brightness of the backlight 302 during the black frame brightness duration. Normally, the black frame brightness can be set to 0 so that the driver chip 303 drives the backlight 302 according to the black frame brightness to achieve backlighting.

[0059] Since the brightness duration of black frames inserted within different frames is usually equal, a brightness duration for a black frame can be preset. Alternatively, in another implementation scenario, the black frame insertion data may also include the brightness duration of the black frame, so that the driver chip 303 turns off the backlight during the brightness duration of the black frame.

[0060] The first brightness data is obtained by the main control chip 304 based on the brightness data of the image to be displayed, and is used to realize the local dimming function.

[0061] The second brightness data can be determined based on the brightness duration of the black frame, the first brightness duration, and the first backlight brightness. In one implementation scenario, the main control chip 304 is specifically configured as follows:

[0062] Determine the sum of the brightness duration of the inserted black frame and the first brightness duration, and determine the ratio of the first brightness duration to the sum;

[0063] Determine the product of the first backlight brightness and the ratio, and use the product as the second backlight brightness.

[0064] Let T0 be the duration of the inserted black frame, T1 be the duration of the first brightness, L1 be the first backlight brightness, and L2 be the second backlight brightness. One specific method for calculating the second backlight brightness L2 is as follows:

[0065]

[0066] At this time, the second backlight brightness L2 is the average brightness of the backlight 302 during the brightness duration T0 of the inserted black frame and the first brightness duration T1.

[0067] For different frames, when the frequencies of the synchronization signals for different frames are different, their corresponding periods are also different. One period includes the brightness duration of the inserted black frame, the first brightness duration, and the second brightness duration. Usually, the brightness duration of the inserted black frame and the first brightness duration are the same for different frames. Therefore, for two synchronization signals with different frequencies, the corresponding second brightness duration will have some difference.

[0068] For a single frame, the average brightness during the brightness duration of the inserted black frame and the first brightness duration is consistent with the average brightness during the second brightness duration. Therefore, the backlight brightness of the backlight 302 remains consistent throughout one cycle. For different frames, the second brightness duration changes when the frequency of the synchronization signal increases or decreases. By adjusting the second backlight brightness of the backlight 302 within the second brightness duration, and based on the fact that the second backlight brightness is the same as the average brightness of the backlight 302 during the brightness duration of the inserted black frame and the first brightness duration, the actual brightness of the backlight 302 remains consistent within each frame, adapting to frequency changes. This effectively avoids backlight flickering issues caused by the BFI function in VRR mode, improving the user experience.

[0069] In some embodiments, the second brightness data includes the backlight brightness of a first portion of the second brightness duration and the backlight brightness of a second portion of the second brightness duration, wherein the backlight brightness of the first portion of the duration is 0, the backlight brightness of the second portion of the duration is equal to the first backlight brightness, and the ratio of the first portion of the duration to the second portion of the duration is equal to the ratio of the brightness duration of the black frame to the first brightness duration.

[0070] In one implementation scenario, the corresponding period duration can be determined based on the frequency of the synchronization signal, and then the second brightness duration can be determined based on the period duration, the brightness duration of the black frame, and the first brightness duration.

[0071] In another implementation scenario, the main control chip 304 is further configured to: when the frequency of the synchronization signal of the image to be displayed is the same as the frequency of the synchronization signal of the previous frame of the image to be displayed, determine that the second brightness duration of the image to be displayed is equal to the second brightness duration of the previous frame of the image.

[0072] When two synchronization signals have the same frequency, their corresponding periods are also the same. Since each period includes the brightness duration of the inserted black frame, the first brightness duration, and the second brightness duration, and the brightness duration of the inserted black frame and the first brightness duration are usually fixed values, the second brightness duration corresponding to different synchronization signals is equal. Therefore, when the frequency of the current frame synchronization signal is the same as the frequency of the previous frame synchronization signal, the second brightness duration corresponding to the previous frame synchronization signal can be directly obtained.

[0073] The second brightness duration includes a first part duration and a second part duration. Since the backlight brightness is 0 during the first part duration, which is consistent with the backlight brightness during the brightness duration of the black frame, and the backlight brightness during the second part duration is equal to the first backlight brightness, and the ratio of the first part duration to the second part duration is equal to the ratio of the black frame brightness duration to the first brightness duration, the average brightness of the backlight 302 during the brightness duration of the black frame and the first brightness duration is equal to the average brightness during the first part duration and the second part duration. This ensures that the brightness of the backlight 302 remains constant within one cycle, adapting to frequency changes and preventing backlight flickering when inserting black frames.

[0074] In one implementation scenario, after receiving black frame insertion data, first brightness data and second brightness data in sequence, the driver chip 303 can generate a corresponding PWM signal based on the black frame insertion data, first brightness data and second brightness data, so as to drive the backlight 302 to emit backlight of corresponding brightness according to the PWM signal.

[0075] This application provides a display device including a liquid crystal display screen 301, a backlight 302, a driver chip 303, and a main control chip 304. When the display device is in a variable refresh rate mode and the black frame insertion function is enabled, the main control chip 304 can acquire the brightness data and synchronization signal of the image to be displayed. Based on the brightness data, the driving information of the image to be displayed is determined. The driving information includes: black frame insertion data for inserting a black frame into the displayed image, and first brightness data of the backlight 302 within a first brightness duration and second brightness data within a second brightness duration after the black frame insertion. The first brightness data includes the first backlight brightness of the backlight 302, and the second brightness data includes the second backlight brightness of the backlight 302. The second backlight brightness is equal to the average brightness of the backlight 302 within the black frame brightness duration and the first brightness duration. After determining the driving information, the black frame insertion data, the first brightness data, and the second brightness data can be sent to the driver chip 303 sequentially at a first time, a second time, and a third time according to the synchronization signal. After receiving the black frame insertion data, the first brightness data, and the second brightness data sequentially, the driver chip 303 can drive the backlight 302 to turn off the backlight during the brightness duration of the inserted black frame according to the black frame insertion data, drive the backlight 302 to emit backlight at the first backlight brightness during the first brightness duration according to the first brightness data, and drive the backlight 302 to emit backlight at the second backlight brightness during the second brightness duration according to the second brightness data. In this application, for a display device in variable refresh rate mode, for each frame (i.e., within one cycle of the synchronization signal), the second backlight brightness of the backlight 302 during the second brightness duration is adjusted so that the second backlight brightness of the backlight 302 during the second brightness duration is equal to the average brightness during the brightness duration of the black frame and the first brightness duration. Therefore, the brightness of the backlight 302 remains constant within one cycle, thus adapting to frequency changes and effectively preventing backlight flickering when inserting a black frame.

[0076] Furthermore, in the above embodiments, in order to solve the backlight flickering problem caused by inserting black frames when the refresh rate of the display device changes, the main control chip 304 needs to send data to the driver chip 303 including brightness data within two different time periods. Correspondingly, the driver chip 303 also needs to receive brightness data within two different time periods, which increases the amount of data that needs to be transmitted between the two chips. If the timing of the brightness data transmission between the two chips is not synchronized, the driver chip 303 will not be able to accurately distinguish the received brightness data, and therefore will not be able to drive the backlight to emit backlight based on the brightness data. Therefore, in the display device provided in this application, the main control chip 304 is configured to send data to the driver chip 303 at specific first, second, and third moments, and the driver chip 303 is configured to receive data sent by the main control chip 304 at specific first, second, and third moments.

[0077] The following is in conjunction with the appendix Figures 4-7 This application describes the synchronization method for data transmission between the main control chip 304 and the driver chip 303.

[0078] In one or more embodiments of this application, the first time is the time after a first delay time of the specified time of the synchronization signal; the second time is the time after a second delay time of the specified time of the synchronization signal; and the third time is the time after a third delay time of the specified time of the synchronization signal, wherein the specified time is the time of the rising edge or the falling edge.

[0079] Rising edge or falling edge refers to the rising edge or falling edge of the synchronization signal. In addition to the rising edge or falling edge being used as a specified time, the specified time can also be other specific times, so as to use the specified time as a reference to determine the first time, the second time, the third time, etc.

[0080] Figure 4 A schematic diagram illustrating the correspondence between synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 1 In VRR mode, as the video content changes, the main control chip 304 will receive synchronization signals of different frequencies. Figure 4 The three frames of images to be displayed are shown, and the frequencies of the three synchronization signals are 144Hz, 100Hz and 120Hz respectively. Figure 4 The time is specified by the falling edge of the synchronization signal, showing the first time after the first delay time Delay1, the second time after the second delay time Delay2, and the third time after the third delay time Delay3.

[0081] Figure 4 The document also shows the driving information corresponding to the three frames of images to be displayed, where ① represents black frame insertion data, ② represents the first brightness data, and ③ represents the second brightness data.

[0082] Figure 4 The diagram also shows the PWM signal generated by the driver chip 303 in each frame based on the received black frame insertion data, brightness data, and second brightness data. Here, T0 represents the brightness duration of the inserted black frame, L0 represents the brightness of the backlight 302 within the brightness duration of the inserted black frame (usually 0), T1 represents the first brightness duration, L1 represents the first backlight brightness of the backlight 302 within the first brightness duration, T2 represents the second brightness duration, and L2 represents the second backlight brightness of the backlight 302 within the second brightness duration.

[0083] For synchronization signals of different frequencies, the brightness duration T0 of the corresponding inserted black frame, the brightness L0 of the backlight 302 within the brightness duration of the inserted black frame, and the first brightness duration T1 are the same.

[0084] In some embodiments, the driving information further includes stop data for the black frame;

[0085] The main control chip 304 is further configured to send the stop data of the black frame to the driver chip 303 at a fourth time, the fourth time being between the second time and the third time;

[0086] The driving chip 303 is further configured to: receive the stop data of the black frame at the fourth time, and after the fourth time, drive the backlight 302 to emit backlight of the first backlight brightness within the first brightness duration according to the first brightness data.

[0087] Figure 5 A schematic diagram illustrating the correspondence between synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 2 ,refer to Figure 5 As shown, the fourth time point is the time after the specified time of the synchronization signal has elapsed for the fourth delay time Delay4. Since the fourth time point is located between the second and third time points, the main control chip 304 sends the black frame insertion data at the first time point, sends the first brightness data at the second time point, sends the black frame stop data ④ at the fourth time point, and finally sends the second brightness data at the third time point.

[0088] In one implementation scenario, for a display device that supports black frame insertion, the stop data for the black frame can be a black frame stop instruction, so that the driver chip 303 turns on the backlight after the fourth moment.

[0089] In another implementation scenario, for display devices that do not support black frame insertion, the stop data of the black frame may include a first backlight brightness, so that the driver chip 303 drives the backlight 302 to emit backlight of the first backlight brightness after the fourth moment.

[0090] In summary, this embodiment determines the first, second, and third moments by directly delaying the received synchronization signal. The calculation is simpler and more direct, without increasing the computational load or the number of signals to be processed for the main control chip 304 and the driver chip 303. Accurate data transmission between the main control chip 304 and the driver chip 303 can be achieved based solely on an existing synchronization signal. Therefore, this embodiment ensures both synchronization and communication efficiency between the main control chip 304 and the driver chip 303, while also synchronizing the data between them. This effectively prevents the driver chip 303 from being unable to distinguish the received data, thus enabling the driver chip 303 to drive the backlight 302 more accurately based on the received driving information.

[0091] In some embodiments, the main control chip 304 is further configured to:

[0092] A first sub-synchronization signal, a second sub-synchronization signal, and a third sub-synchronization signal are determined based on the synchronization signal. The first time is a specified time of the first sub-synchronization signal, the second time is a specified time of the second sub-synchronization signal, and the third time is a specified time of the third sub-synchronization signal. The specified time is the time of the rising edge or the falling edge.

[0093] The first sub-synchronization signal is used to transmit the insertion data of the black frame, the second sub-synchronization signal is used to transmit the first brightness data, and the third sub-synchronization signal is used to transmit the second brightness data.

[0094] When determining the first, second, and third sub-synchronization signals based on the synchronization signal, the determination can be based on the frequency of the synchronization signal. For example, the frequency of the synchronization signal can be evenly distributed; if the frequency of the synchronization signal is 100Hz, then the first, second, and third sub-synchronization signals, each with a frequency of 300Hz, can be generated. Alternatively, the frequency of the synchronization signal can be unevenly distributed, in which case the first, second, and third sub-synchronization signals will have different frequencies. This application does not limit the specific method for generating the first, second, and third sub-synchronization signals based on the synchronization signal.

[0095] Figure 6 A schematic diagram illustrating the correspondence between synchronization signals, sub-synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 1 ,refer to Figure 6 As shown, for the sub-synchronization signals, 1 represents the first sub-synchronization signal, 2 represents the second sub-synchronization signal, and 3 represents the third sub-synchronization signal. Based on the three sub-synchronization signals, the transmission of three data segments in the driving information, namely the insertion data of the black frame, the first brightness data, and the second brightness data, is realized. Figure 6 The remaining information displayed is consistent with Figure 4 The information is consistent with that in the previous text, so I will not go into details here.

[0096] In another implementation scenario, a fourth sub-synchronization signal can be determined based on the synchronization signal. The specified time of the fourth sub-synchronization signal is located between the command time of the second sub-synchronization signal and the command time of the third sub-synchronization signal. Correspondingly, the main control chip 304 is also configured to send stop data of a black frame to the driver chip 303 at the specified time corresponding to the fourth sub-synchronization signal, so that after receiving the stop data of the black frame, the driver chip 303 drives the backlight 302 to emit backlight with a first backlight brightness within a first brightness duration based on the first brightness data.

[0097] Figure 7 A schematic diagram illustrating the correspondence between synchronization signals, sub-synchronization signals, drive information, and PWM signals provided in this application embodiment. Figure 2 , Figure 7 The number 4 in the diagram represents the fourth sub-synchronization signal, which is used to transmit the stop data of the black frame ④.

[0098] Figure 8 This is a schematic diagram of a screen display effect provided in an embodiment of this application, where 0 represents the brightness duration of the inserted black frame, 1 represents the first brightness duration, and 2 represents the second brightness duration. Synchronization signals of different frequencies correspond to the same brightness duration for their black frames, i.e., the length corresponding to 0 is the same; the first brightness duration is also the same, i.e., the length corresponding to 1 is the same, but the second brightness duration has certain differences.

[0099] In combination with the above Figures 4 to 7 As shown, when the frequency of the synchronization signal decreases, the number of PWM signal cycles increases, and the duration of brightness increases. When the frequency of the synchronization signal increases, the number of PWM signal cycles decreases, and the duration of brightness decreases. When the frequency changes, the backlight 302 maintains brightness for a certain period of time to keep its brightness constant within one cycle, adapting to the frequency change and preventing backlight flickering when inserting black frames.

[0100] In summary, this embodiment generates multiple sub-synchronization signals, such as a first sub-synchronization signal, a second sub-synchronization signal, and a third sub-synchronization signal, based on the received synchronization signal. This allows for the determination of the first, second, and third time points based on these specific sub-synchronization signals, thereby achieving accurate data transmission between the main control chip 304 and the driver chip 303. Therefore, this embodiment increases the accuracy of synchronization between the main control chip 304 and the driver chip 303 by setting sub-synchronization signals, enabling the driver chip 303 to more accurately distinguish the data sent by the main control chip 304. Simultaneously, it allows the driver chip 303 to more accurately drive the backlight 302 based on the received driving information.

[0101] Figure 9 A flowchart illustrating a backlight brightness control method provided in this application is shown below. Figure 9 As shown, the method includes the following steps:

[0102] S901: When the display device is in variable refresh rate mode and black frame insertion function is enabled, acquire the brightness data and synchronization signal of the image to be displayed.

[0103] S902: Determine the driving information of the image to be displayed based on the brightness data. The driving information includes: black frame insertion data for inserting a black frame into the image to be displayed, first brightness data of the backlight within a first brightness duration after inserting the black frame, and second brightness data within a second brightness duration. The first brightness data includes the first backlight brightness of the backlight, and the second brightness data includes the second backlight brightness of the backlight. The second backlight brightness is equal to the average brightness of the backlight within the brightness duration of the black frame and the first brightness duration.

[0104] S903: According to the synchronization signal, the black frame insertion data, the first brightness data, and the second brightness data are sent to the driver chip sequentially at the first time, the second time, and the third time, so that the driver chip drives the backlight to turn off the backlight during the brightness duration of the inserted black frame according to the black frame insertion data, drives the backlight to emit the first backlight brightness during the first brightness duration according to the first brightness data, and drives the backlight to emit the second backlight brightness during the second brightness duration according to the second brightness data.

[0105] In summary, the backlight brightness control method provided in this application embodiment can be executed by the main control chip in the display device provided in the above embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0106] This application provides a main control chip for executing the backlight brightness control method provided in the above embodiments. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0107] Figure 10 This is a schematic diagram of a backlight brightness control device provided in this application. Figure 10 As shown, the backlight brightness control device includes 1000: an acquisition module 1001, a determination module 1002, and a transmission module 1003.

[0108] The acquisition module 1001 is used to acquire the brightness data and synchronization signal of the image to be displayed when the display device is in a variable refresh rate mode and the black frame insertion function is enabled.

[0109] The determining module 1002 is used to determine the driving information of the image to be displayed based on the brightness data. The driving information includes: black frame insertion data for inserting black frames into the image to be displayed, first brightness data of the backlight within a first brightness duration after inserting the black frame, and second brightness data within a second brightness duration. The first brightness data includes the first backlight brightness of the backlight, and the second brightness data includes the second backlight brightness of the backlight. The second backlight brightness is equal to the average brightness of the backlight within the brightness duration of the black frame and the first brightness duration.

[0110] The transmitting module 1003 is configured to transmit the black frame insertion data, the first brightness data, and the second brightness data to the driving chip sequentially at a first time, a second time, and a third time according to the synchronization signal, so that the driving chip drives the backlight to turn off the backlight during the brightness duration of the inserted black frame according to the black frame insertion data, drives the backlight to emit backlight at the first backlight brightness during the first brightness duration according to the first brightness data, and drives the backlight to emit backlight at the second backlight brightness during the second brightness duration according to the second brightness data.

[0111] The backlight brightness control device provided in this application embodiment can execute the backlight brightness control method in the above method embodiment. Its implementation principle and technical effects are similar, and will not be repeated here. It should be noted that the above... Figure 10 The division of modules shown is merely illustrative. This application does not limit the division of modules or the naming of modules.

[0112] This application also provides a computer-readable storage medium, which may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. Specifically, the computer-readable storage medium stores program instructions, which are used in the methods described in the above embodiments.

[0113] This application also provides a program product including executable instructions stored in a readable storage medium. At least one control module of a display device can read the executable instructions from the readable storage medium, and the at least one control module executes the executable instructions to cause the display device to implement the methods provided in the various embodiments described above.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0115] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A display device, characterized by comprising: The display device comprises: a liquid crystal display screen for displaying an image; a backlight source for emitting backlight to illuminate the liquid crystal display screen; a driving chip connected with the backlight source for driving the backlight source to emit backlight; a master control chip connected with the driving chip for sending driving information to the driving chip, so that the driving chip drives the backlight source to emit backlight according to the received driving information; the master control chip is configured to: acquire brightness data and a synchronization signal of a to-be-displayed image when the display device is in a variable refresh rate mode and a black frame insertion function is turned on; determine driving information of the to-be-displayed image according to the brightness data, wherein the driving information comprises black frame insertion data of inserting a black frame in the to-be-displayed image, first brightness data of the backlight source in a first brightness duration after inserting the black frame, and second brightness data of the backlight source in a second brightness duration, wherein the first brightness data comprises a first backlight brightness of the backlight source, the second brightness data comprises a second backlight brightness of the backlight source, and the second backlight brightness is equal to an average brightness of the backlight source in a brightness duration of the black frame and the first brightness duration; send the black frame insertion data, the first brightness data and the second brightness data to the driving chip in a first time, a second time and a third time according to the synchronization signal; the driving chip is configured to: receive the black frame insertion data, the first brightness data and the second brightness data in the first time, the second time and the third time in sequence, and drive the backlight source to turn off backlight in a brightness duration of inserting the black frame according to the black frame insertion data, emit the first backlight brightness of backlight in the first brightness duration according to the first brightness data, and emit the second backlight brightness of backlight in the second brightness duration according to the second brightness data.

2. The display device of claim 1, wherein, The first time is a time after a first delay time from a specified time of the synchronization signal; the second time is a time after a second delay time from the specified time of the synchronization signal; and the third time is a time after a third delay time from the specified time of the synchronization signal, and the specified time is a time of a rising edge or a falling edge.

3. The display device of claim 1, wherein, The master control chip is further configured to: determine a first sub-synchronization signal, a second sub-synchronization signal and a third sub-synchronization signal according to the synchronization signal, the first time is a specified time of the first sub-synchronization signal, the second time is a specified time of the second sub-synchronization signal, and the third time is a specified time of the third sub-synchronization signal, and the specified time is a time of a rising edge or a falling edge.

4. The display device of claim 1, wherein, The driving information further comprises stop data of the black frame; the master control chip is further configured to send the stop data of the black frame to the driving chip at a fourth time, and the fourth time is between the second time and the third time. The driving chip is further configured to drive the backlight source to emit the first backlight brightness in the first brightness duration according to the first brightness data after the fourth time point.

5. The display device of claim 1, wherein, The black frame insertion data further comprises a brightness duration of the black frame.

6. The display device according to any of claims 1-5, characterized in that, The master control chip is specifically configured to: determine a sum of the brightness duration of the inserted black frame and the first brightness duration, and determine a ratio of the first brightness duration to the sum; determine a product of the first backlight brightness and the ratio, and take the product as the second backlight brightness.

7. The display device of any one of claims 1-5, wherein: the second brightness data comprises a backlight brightness of a first partial duration in the second brightness duration and a backlight brightness of a second partial duration in the second brightness duration, wherein the backlight brightness of the first partial duration is 0, the backlight brightness of the second partial duration is equal to the first backlight brightness, and a ratio of the first partial duration to the second partial duration is equal to a ratio of the brightness duration of the black frame to the first brightness duration.

8. The display device of claim 1, wherein, The master control chip is further configured to: when the frequency of the synchronization signal of the to-be-displayed image is the same as the frequency of the synchronization signal of a previous frame image of the to-be-displayed image, determine that the second brightness duration of the to-be-displayed image is equal to the second brightness duration of the previous frame image.

9. A method of backlight brightness control, the method comprising: The method comprises: in a case where the display device is in a variable refresh rate mode and a black frame insertion function is turned on, obtaining brightness data and a synchronization signal of a to-be-displayed image; determining driving information of the to-be-displayed image according to the brightness data, the driving information comprising: black frame insertion data for inserting a black frame in the to-be-displayed image, first brightness data of the backlight source in a first brightness duration after the black frame is inserted, and second brightness data of the backlight source in a second brightness duration, wherein the first brightness data comprises a first backlight brightness of the backlight source, the second brightness data comprises a second backlight brightness of the backlight source, and the second backlight brightness is equal to an average brightness of the backlight source in the brightness duration of the black frame and the first brightness duration; according to the synchronization signal, sequentially sending the black frame insertion data, the first brightness data, and the second brightness data to the driving chip at a first time point, a second time point, and a third time point, so that the driving chip drives the backlight source to be turned off in the brightness duration of the inserted black frame according to the black frame insertion data, to emit the first backlight brightness in the first brightness duration according to the first brightness data, and to emit the second backlight brightness in the second brightness duration according to the second brightness data.

10. A master chip, characterized by The master control chip is configured to perform the method of claim 9.

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