Backlight adjusting method of display panel and display panel
By decomposing the backlight adjustment method of the display panel into multiple blocks and sending brightness data simultaneously, the backlight lag problem is solved, and efficient backlight control and image display effects are achieved, adapting to different refresh rates and content needs, and reducing power consumption.
Patent Information
- Application Number
- CN202510729473.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-08-12
Smart Images
Figure CN120472838A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of display technology, and in particular to a method for adjusting the backlight of a display panel and a display panel. Background Art
[0002] In order to pursue higher contrast and HDR1000 / HDR1400 display effects, display products need to adopt a high-partition backlight design. The backlight current is reduced in dark areas, and the bright blocks parse HDR data to meet high brightness requirements.
[0003] Currently, backlight displays require parsing a single frame of image, breaking it down into N small blocks through partitioning (e.g., a 3840*2160 UHD panel has a 48*24 partition, meaning the block size H is 3840 / 48 = 80, and V is 2160 / 24 = 90, so the pixel count per block is 80*90). For example, 1152 partitions (48x24) are used. The image processing unit (Scaler) transmits the brightness information of each of the N partitions of a frame to the backlight driver via the SPI protocol, activating the backlight. From the moment the image is displayed to the moment the backlight is activated, the backlight response time is equal to one frame time plus the SPI data transmission time plus the backlight driver display time. Since data acquisition takes one frame, the time it takes for the SPI to send the local dimming partition data is delayed by at least one frame, causing backlight lag. Summary of the Invention
[0004] The purpose of the embodiments of the present application is to provide a method for adjusting the backlight of a display panel and a display panel, so as to improve or eliminate the backlight lag phenomenon.
[0005] The present application discloses a method for adjusting the backlight of a display panel, which is used to adjust the backlight of a display panel. The method comprises the following steps:
[0006] S1: Decompose a frame into N blocks along the transmission direction of the data signal and mark them as the first block, the second block, and so on.
[0007] S2: In the first block to the Nth block, first obtain the brightness information of the first block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the first block; then obtain the brightness information of the second block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the second block; and so on. Finally, obtain the brightness information of the Nth block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the Nth block;
[0008] The scanning direction of the display panel is the same as the direction from the first block to the Nth block, and N is a natural number greater than 2.
[0009] Optionally, before the step of decomposing a frame of image into N blocks along the transmission direction of the data signal and marking them as the first block, the second block, ... the Nth block, the following steps are further included:
[0010] S0: Detect the refresh rate of the next frame. If the refresh rate is greater than or equal to the preset refresh rate, execute step S1. If it is less than the preset refresh rate, obtain the brightness information of the next frame and send all the brightness information of the next frame to the backlight of the display panel through the first protocol to light up the entire backlight of the display panel.
[0011] Optionally, in step S1 , the number of scan lines in each of the first block to the N-1th block is the same, and the number of scan lines in the Nth block is different from the number of scan lines in the first block.
[0012] Optionally, the display panel includes a trigger module and a row counter, the row counter records the number of scan lines of the scan line, and the trigger module triggers the acquisition of brightness information of the corresponding block according to the judgment result of the row counter. Step S2 includes the following steps:
[0013] Acquire brightness information of the first block, and send the brightness information corresponding to the first block to the backlight of the display panel to light up the backlight corresponding to the first block; count the first row of scan lines in the display panel, and when the number of scan lines is equal to a first preset value, acquire brightness information of the second block;
[0014] Sending brightness information of the second block to the backlight of the display panel to light up the backlight corresponding to the second block; when the number of scan lines is equal to 2 times the first preset value, obtaining brightness information of the third block;
[0015] Sending brightness information of the third block to the backlight of the display panel to light up the backlight corresponding to the third block; when the number of scan lines is equal to 3 times the first preset value, obtaining brightness information of the fourth block;
[0016] …
[0017] Sending brightness information of the N-1th block to the backlight of the display panel to light up the backlight corresponding to the N-1th block; when the number of scan lines is equal to N-1 times the first preset value, obtaining the brightness information of the Nth block;
[0018] The brightness information of the Nth block is sent to the backlight of the display panel to light up the backlight corresponding to the Nth block, thereby lighting up the backlight of the entire display panel; when the frame start signal of the next frame arrives, the brightness information of the first block corresponding to the next frame image is re-acquired and sent to the backlight of the display panel to light up the backlight of the corresponding first block;
[0019] Wherein, N is a natural number greater than or equal to 6.
[0020] Optionally, in step S1, the number of scan lines in each of the first to Nth blocks is the same, the display panel includes a trigger module and a row counter, the row counter records the number of scan lines, and the trigger module triggers the acquisition of brightness information of the corresponding block according to a determination result of the row counter. Step S2 includes the following steps:
[0021] Acquire brightness information of the first block, and send the brightness information corresponding to the first block to the backlight of the display panel to light up the backlight corresponding to the first block; count the first row of scan lines in the display panel, and when the number of scan lines is equal to a first preset value, acquire brightness information of the second block;
[0022] Sending brightness information of the second block to the backlight of the display panel to light up the backlight corresponding to the second block; when the number of scan lines is equal to 2 times the first preset value, obtaining brightness information of the third block;
[0023] Sending brightness information of the third block to the backlight of the display panel to light up the backlight corresponding to the third block; when the number of scan lines is equal to 3 times the first preset value, obtaining brightness information of the fourth block;
[0024] …
[0025] Sending brightness information of the N-1th block to the backlight of the display panel to light up the backlight corresponding to the N-1th block; when the number of scan lines is equal to N-1 times the first preset value, obtaining the brightness information of the Nth block;
[0026] Sending the brightness information of the Nth block to the backlight of the display panel to light up the backlight corresponding to the Nth block, thereby lighting up the backlight of the entire display panel; when the number of scan lines is equal to N times the first preset value, reacquiring the brightness information of the first block corresponding to the next frame image and sending the brightness information to the backlight of the display panel to light up the backlight of the corresponding first block;
[0027] Wherein, N is a natural number greater than or equal to 6.
[0028] Optionally, the display panel includes a backlight current output module and a backlight current adjustment module, and the step S2 further includes the following steps:
[0029] The brightness of the display panel corresponding to the first block to the Nth block is detected to determine whether the brightness of the first block to the Nth block is equal to the ideal brightness value. If so, the backlight current output module outputs the corresponding current to the backlight in the corresponding first block to the Nth block. If not, the backlight current adjustment module adjusts the current output by the backlight current output module to output it to the backlight in the corresponding first block to the Nth block.
[0030] Optionally, the display panel includes a vertical synchronization signal and a data clock signal. Before the brightness information of each block is sent, the vertical synchronization signal is triggered first. The data clock signal is at a low level during the idle time, and the data clock signal is valid on the rising edge. The phase between the vertical synchronization signal and the data clock signal is T+△t, where T>0 and △t<10us.
[0031] The present application also discloses a display panel, which uses the backlight adjustment method of any of the display panels described above to adjust the backlight corresponding to the display panel. The display panel includes S scan lines, and the S scan lines are divided into N blocks along the transmission direction of the data signal. The display panel includes an image processing module, which obtains the brightness information of the N blocks and sends it to the backlight of the display panel N times through the first protocol of the serial peripheral interface to light up the backlight of the corresponding block.
[0032] Optionally, the display panel includes a refresh rate judgment module, which is connected to the image processing module. The refresh rate judgment module detects the refresh rate of the next frame and determines whether the refresh rate is greater than or equal to the preset refresh rate. The image processing module obtains the brightness information of N blocks and sends it to the backlight of the display panel N times through the first protocol to light up the backlight of the corresponding block. If it is less than the preset refresh rate, the image processing module obtains the brightness information of the next frame and sends all the brightness information of the next frame to the backlight of the display panel through the first protocol to light up the entire backlight of the display panel.
[0033] Optionally, the display panel includes a brightness detection module, a backlight current output module and a backlight current regulation module. The brightness detection module is connected to the backlight current output module and the backlight current regulation module respectively. The backlight current output module and the backlight current regulation module are electrically connected. The brightness detection module detects the brightness of the display panel corresponding to the first block to the Nth block, and determines whether the brightness of the first block to the Nth block is equal to the ideal brightness value. If so, the backlight current output module outputs the corresponding current to the backlight in the corresponding first block to the Nth block. If not, the backlight current regulation module adjusts the current output by the backlight current output module to output it to the backlight in the corresponding first block to the Nth block.
[0034] Compared with the original solution of transmitting the brightness information of a frame of picture to the backlight of the display panel at one time, the present application divides a frame of picture into N blocks, and the brightness data of the N blocks are sent to the backlight of the display panel multiple times. There is no need to send the brightness data of one frame at a time. Only the data corresponding to one block is collected at a time, and is sent to the backlight of the display panel N times through the first protocol of the serial peripheral interface to light up the backlight of the corresponding block, thereby improving or even eliminating the phenomenon of abnormal display picture caused by backlight lag. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:
[0036] Figure 1 This is a flow chart of the adjustment method according to the first embodiment of the present application;
[0037] Figure 2 is a flow chart of the adjustment method according to the second embodiment of the present application;
[0038] Figure 3 1 is a flow chart of the adjustment method according to the third embodiment of the present application;
[0039] Figure 4 1 is a flow chart of the adjustment method according to the fourth embodiment of the present application;
[0040] Figure 5 is a flowchart of the adjustment method of the fifth embodiment of the present application;
[0041] Figure 6 is a schematic structural diagram of a display panel according to a sixth embodiment of the present application;
[0042] Figure 7 is a schematic structural diagram of a display panel according to a seventh embodiment of the present application;
[0043] Figure 8 It is a schematic diagram of the display panel structure of the eighth embodiment of the present application.
[0044] Among them, 100, display panel; 110, trigger module; 120, row counter; 130, backlight current output module; 140, backlight current adjustment module; 150, image processing module; 160, refresh rate judgment module; 170, brightness detection module; 180, serial peripheral interface; 200, backlight; first block to Nth block - L1 ~ LN; G1 ~ GS - scan line. DETAILED DESCRIPTION
[0045] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.
[0046] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.
[0047] In addition, terms indicating orientation or positional relationships such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.
[0048] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.
[0049] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.
[0050] Example 1:
[0051] refer to Figure 1 As shown, as a first embodiment of the present application, a method for adjusting the backlight of a display panel is disclosed, which is used to adjust the backlight of the display panel, and is characterized in that the adjustment method includes the following steps:
[0052] S1: Decompose a frame into N blocks along the transmission direction of the data signal and mark them as the first block, the second block, and so on.
[0053] S2: In the first block to the Nth block, first obtain the brightness information of the first block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the first block; then obtain the brightness information of the second block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the second block; and so on. Finally, obtain the brightness information of the Nth block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the Nth block;
[0054] The scanning direction of the display panel is the same as the direction from the first block to the Nth block, and N is a natural number greater than 2.
[0055] In this application, the transmission direction of the data signal along the data line can also be understood as the vertical direction when the display panel is placed. A frame of the picture is divided into N blocks, where N is a natural number greater than or equal to 2. That is, a picture can be divided into two blocks, or more. Of course, in some cases, it can also be undivided. This application mainly focuses on the partitioning. After being divided into N blocks, the N blocks are marked in sequence as the first block, the second block...the Nth block; in the specific local backlight (LocalDimming) adjustment, the brightness information of the first block is first obtained and sent to the backlight of the display panel through the first protocol to light up the backlight corresponding to the first block; at this time, only the brightness information of the first block is obtained, and the brightness information of other blocks is not obtained. After the backlight adjustment corresponding to the first block is completed, the brightness information of the second block is then obtained and sent to the backlight of the display panel through the first protocol to light up the backlight corresponding to the second block; and so on. Finally, the brightness information of the Nth block is obtained and sent to the backlight of the display panel through the first protocol to light up the backlight corresponding to the Nth block.
[0056] Unlike the method of sending all the data at once, sending local dimming data in segments is to more finely control the backlight brightness. Since LocalDimming requires independent brightness adjustment according to different areas of the image content, if all the data is sent at once, it may result in excessive data transmission volume, increasing the communication burden between the SOC and the display panel. Moreover, processing a large amount of local dimming data at one time may also place higher requirements on the processing power of the SOC and the response speed of the display panel. By sending local dimming data in segments, the entire image can be divided into multiple smaller areas, and only the data of one or several areas is sent at a time. This not only reduces the amount of single data transmission and improves the efficiency of data transmission, but also allows the system on chip (SOC) more time to process and prepare the local dimming data for each area, ensuring that the display panel can accurately achieve the local dimming effect and can avoid abnormal display caused by backlight lag.
[0057] Example 2:
[0058] refer to Figure 2 As shown, as the second embodiment of the present application, it is a further refinement of the above-mentioned first embodiment. Generally, the first protocol is the SPI (Serial Peripheral Interface) protocol, a communication protocol for data transmission. In the step S1, the number of scan lines in each block from the first block to the N-1th block is the same, the number of scan lines in the Nth block is different from the number of scan lines in the first block, and after the scan lines in some display panels are divided into corresponding areas, the number of scan lines in the last block and other blocks may be different. In the specific count, there may be certain differences. In this way, when dividing the blocks, there is no need to calculate too much, nor is it necessary to consider whether the blocks are evenly distributed, providing multiple possibilities for the division of blocks.
[0059] The display panel includes a trigger module and a row counter. The row counter records the number of scan lines. The trigger module triggers the acquisition of brightness information of the corresponding block according to the judgment result of the row counter. Step S2 includes the following steps:
[0060] S21: Obtaining brightness information of a first block, sending the brightness information corresponding to the first block to a backlight of a display panel to illuminate the backlight corresponding to the first block; counting from a first row of scan lines in the display panel, and when the number of scan lines is equal to a first preset value, obtaining brightness information of a second block;
[0061] S22: Sending brightness information of the second block to the backlight of the display panel to light up the backlight corresponding to the second block; when the number of scan lines is equal to 2 times the first preset value, obtaining brightness information of the third block;
[0062] S23: sending the brightness information of the third block to the backlight of the display panel to light up the backlight corresponding to the third block; when the number of scan lines is equal to 3 times the first preset value, obtaining the brightness information of the fourth block;
[0063] …
[0064] S2(N-1): Sending brightness information of the N-1th block to the backlight of the display panel to light up the backlight corresponding to the N-1th block; when the number of scan lines is equal to N-1 times the first preset value, obtaining the brightness information of the Nth block;
[0065] S2(N): Sending the brightness information of the Nth block to the backlight of the display panel to light up the backlight corresponding to the Nth block, thereby lighting up the backlight of the entire display panel; when the frame start signal of the next frame arrives, re-acquiring the brightness information of the first block corresponding to the next frame image and sending it to the backlight of the display panel to light up the backlight of the corresponding first block;
[0066] Wherein, N is a natural number greater than or equal to 6.
[0067] Furthermore, the display panel includes a vertical synchronization signal (VSYNC) and a data clock signal (SPI_CLK). Before the brightness information of each block is sent, by triggering the VSYNC signal first, the software can ensure that each segment of LocalDimming data can be sent and processed through the SPI interface at the correct time point, thereby achieving precise backlight control and high-quality image display, and the image data transmitted by the SPI protocol is synchronized with the VSYNC signal; the data clock signal is at a low level during the idle time, and the data clock signal is valid on the rising edge. The phase between the vertical synchronization signal and the data clock signal is T+△t, where T>0 and △t<10us.
[0068] In this embodiment, assuming a frame of data is originally sent in 48*24 partitions at a time, and using a refresh rate of 160Hz as an example, the processing time for a frame of data is 1000ms / 160 = 6.25ms. The data acquisition time is the same as the time of a frame. Therefore, the SPI transmission of the local dimming partition data has a delay of one frame. If the data is transmitted in 12 segments, only 48*2 partitions of data are collected at a time and can be sent via the SPI, the response delay is 6.25ms / 12 = 520us. Generally, the SPI data transmission time is 1.717ms. To send local dimming data in segments, the software needs to trigger VSYNC multiple times using interrupts. The VSYNC signal is triggered before each SPI data transmission. The SPI data is reduced to 1 / 12 of its original size due to partitioning, resulting in a corresponding time of 143us. The backlight driver feedback data time is 1.125ms. Since the SPI data transmission is reduced to 1 / 12 of its original size, the backlight feedback signal data is also reduced to 1 / 12, or 93.75us. This shows that after partitioning, the data acquisition time, transmission time, and feedback time are all reduced. Compared with the previous delay of at least one frame, when the number of partitions is large enough, there will be no backlight delay, thereby improving or even eliminating the backlight delay problem.
[0069] In addition, after partitioning and combining the row counter to record the number of scan lines, the corresponding brightness information of different blocks can be obtained, thereby independently controlling the backlight brightness of each block; the row counter is used to judge the number of scan lines of the scan line, and the brightness information of each block is obtained in a certain order and the backlight of the corresponding block is lit, avoiding unnecessary backlight always on, thereby reducing power consumption; in addition, when the next frame start signal arrives, the brightness information of the first block corresponding to the next frame can be quickly retrieved and sent to the backlight module to achieve fast backlight switching.
[0070] Example 3:
[0071] like Figure 3 As shown, as the third embodiment of the present application, different from the above-mentioned second embodiment, in step S1, the number of scan lines in each block from the first block to the Nth block is the same, the display panel includes a trigger module and a row counter, the row counter records the number of scan lines, and the trigger module triggers the acquisition of brightness information of the corresponding block according to the judgment result of the row counter. Step S2 includes the following steps:
[0072] S21: Obtaining brightness information of a first block, sending the brightness information corresponding to the first block to a backlight of a display panel to illuminate the backlight corresponding to the first block; counting from a first row of scan lines in the display panel, and when the number of scan lines is equal to a first preset value, obtaining brightness information of a second block;
[0073] S22: Sending brightness information of the second block to the backlight of the display panel to light up the backlight corresponding to the second block; when the number of scan lines is equal to 2 times the first preset value, obtaining brightness information of the third block;
[0074] S23: sending the brightness information of the third block to the backlight of the display panel to light up the backlight corresponding to the third block; when the number of scan lines is equal to 3 times the first preset value, obtaining the brightness information of the fourth block;
[0075] …
[0076] S2(N-1): Sending brightness information of the N-1th block to the backlight of the display panel to light up the backlight corresponding to the N-1th block; when the number of scan lines is equal to N-1 times the first preset value, obtaining the brightness information of the Nth block;
[0077] S(N'): Sending the brightness information of the Nth block to the backlight of the display panel to light up the backlight corresponding to the Nth block, thereby lighting up the backlight of the entire display panel; when the number of scan lines is equal to N times the first preset value, reacquiring the brightness information of the first block corresponding to the next frame and sending it to the backlight of the display panel to light up the backlight of the corresponding first block;
[0078] Wherein, N is a natural number greater than or equal to 6.
[0079] This embodiment divides all scan lines equally to obtain corresponding blocks. The acquisition of brightness information for the corresponding blocks is triggered based on the row counter's determination. This mechanism ensures that brightness information is acquired only when needed, reducing unnecessary calculations and data processing. Furthermore, before each block's brightness information is transmitted, the vertical synchronization signal is triggered. "The SPI data VSYNC is synchronized with the image refresh rate," meaning that image data transmitted via the SPI protocol is synchronized with the VSYNC signal. That is, at the beginning of each frame (i.e., when the VSYNC signal is triggered), the SPI interface begins or synchronizes the transmission of that frame's image data. The data clock signal is low during its idle time and is valid on its rising edge. The phase between the vertical synchronization signal and the data clock signal is T+Δt, where T>0. There is a fixed phase difference, T, between the vertical synchronization signal and the data clock signal. This phase difference is necessary to ensure that the data clock signal begins its data transmission cycle at a stable and predictable time after the vertical synchronization signal is triggered. Without this fixed phase difference, data transmission may be out of sync with the expected display scan sequence, affecting the final display quality. The phase difference is further limited to a fine range of △t < 10us to ensure phase matching between the two signals. The smaller △t ensures the synchronization accuracy between the vertical synchronization signal and the data clock signal, so that the brightness information of each block can be connected to the display scanning mechanism at a precise time point, avoiding display anomalies such as picture delay and misalignment caused by slight signal asynchrony.
[0080] Example 4:
[0081] like Figure 4 As shown, as the fourth embodiment of the present application, which is a further improvement to any of the above embodiments, the following steps are further included before the step S1:
[0082] S0: Detect the refresh rate of the next frame. If the refresh rate is greater than or equal to the preset refresh rate, execute step S1. If it is less than the preset refresh rate, obtain the brightness information of the next frame and send all the brightness information of the next frame to the backlight of the display panel through the first protocol to light up the entire backlight of the display panel.
[0083] This embodiment primarily detects the refresh rate of the next frame and determines the subsequent processing method based on the comparison between the refresh rate and the preset refresh rate. If the refresh rate is greater than or equal to the preset refresh rate, step S1 and subsequent steps are executed; if it is less than the preset refresh rate, the brightness information of the next frame is obtained and sent to the display panel backlight via the first protocol to illuminate the entire backlight. By dynamically adjusting the refresh rate, the design can adapt to different display requirements.
[0084] By detecting the refresh rate and determining different processing paths based on the comparison with the preset value, the display panel can better adapt to the display requirements of different types of content. For high-refresh-rate content, such as dynamic videos and games, a subsequent more refined block processing method is used to provide a smoother and clearer display effect. For low-refresh-rate content, such as static images, the method of lighting up the entire backlight can not only simplify the processing flow, but also ensure the uniformity of display brightness to a certain extent, while reducing the potential increase in power consumption caused by frequent block processing. When the refresh rate is low, lighting up the entire backlight is relatively simple and direct, reducing the complex circuit operation and signal transmission energy consumption caused by block division and block-by-block processing, which helps to improve energy efficiency, extend the battery life of the display device, or reduce overall power consumption.
[0085] Example 5:
[0086] refer to Figure 5 As shown, as the fifth embodiment of the present application, it is a further refinement and improvement of any of the above embodiments. The display panel includes a backlight current output module and a backlight current adjustment module. The backlight current output module is mainly responsible for outputting the initial current to the backlight of each block according to certain rules. The output current can be based on preset parameters or information from the previous processing link to provide a basic brightness drive current for each block. For example, when the display panel is first lit or the scene is switched, the backlight current output module can quickly provide a roughly appropriate current to each block, so that the display panel can quickly present recognizable image content. The backlight current adjustment module dynamically adjusts the current output by the backlight current output module. The S2 step also includes the following steps:
[0087] S3: Detect the brightness of the display panel corresponding to the first block to the Nth block, and determine whether the brightness of the first block to the Nth block is equal to the ideal brightness value. If so, the backlight current output module outputs the corresponding current to the backlight in the corresponding first block to the Nth block; if not, the backlight current adjustment module adjusts the current output by the backlight current output module to output it to the backlight in the corresponding first block to the Nth block.
[0088] By adding a backlight current output module and a backlight current adjustment module, and detecting the brightness of each block and comparing it with the ideal brightness value in step S3, the backlight brightness of each block of the display panel can be controlled more accurately. In actual applications, due to various factors (such as changes in ambient light, display content characteristics, etc.), the actual brightness of each block may deviate from the expected ideal brightness. Through real-time detection and current adjustment based on the detection results, it is ensured that each block can achieve the ideal display brightness, thereby improving the accuracy and visual effect of image display. For example, when displaying high dynamic range (HDR) content, the details of the bright and dark parts can be displayed more clearly, avoiding areas that are too bright or too dark, and improving the user's visual experience.
[0089] Example 6:
[0090] refer to Figure 6 As shown, as the sixth embodiment of the application, a display panel 100 is disclosed, which uses the backlight adjustment method of the display panel as described in any of the above embodiments to adjust the backlight 200 corresponding to the display panel 100, and the display panel 100 includes S scan lines, and the S scan lines are divided into N blocks along the transmission direction of the data signal. The display panel 100 includes an image processing module 150, and the image processing module 150 obtains the brightness information of the N blocks and sends it to the backlight 200 of the display panel 100 N times through the first protocol on the serial peripheral interface 180 to light up the backlight 200 of the corresponding block.
[0091] In this embodiment, the image processing module 150 obtains brightness information and sends it to the backlight 200 through a specific protocol to achieve functions such as lighting, and a frame of the display panel 100 is divided into N blocks, which is actually the division of the scan lines, that is, the scan lines in the display panel 100 are divided into N blocks. The number of scan lines in each block can be changed according to the number of blocks and the total number of scan lines of the display panel 100. Generally, the scan lines are evenly divided in each block. After obtaining the brightness data of each block, it is transmitted in sequence through the first protocol. In order to ensure normal display, the scanning order of the scan lines in the block is usually also scanned in the block order; for example, in the first block L1 to the Nth block LN, the brightness information of the first block L1 is first obtained and sent to the backlight 200 of the display panel 100 through the first protocol to light up the corresponding first block. The backlight 200 of L1, the scan lines in the first block L1 also start scanning from the first row, and finally obtain the brightness information of the Nth block LN and send it to the backlight 200 of the display panel 100 through the first protocol to light up the backlight 200 corresponding to the Nth block LN. The scan lines in the last block also start scanning after the scan lines of the previous block are finished. The brightness data of N blocks are sent to the backlight 200 of the display panel 100 in multiple times. There is no need to send a frame of brightness data at a time. Only the data corresponding to one block is collected at a time and sent to the backlight 200 of the display panel 100 N times through the first protocol of the serial peripheral interface 180 to light up the backlight 200 of the corresponding block. The scan lines in the N blocks are also scanned in sequence. When achieving normal scanning display, the abnormal display screen caused by the lag of the backlight 200 is improved or even eliminated.
[0092] Furthermore, the display panel 100 includes a trigger module 110 and a row counter. The row counter records the number of scan lines of the scan line. The trigger module 110 triggers the acquisition of brightness information of the corresponding block according to the judgment result of the row counter. After partitioning, the row counter is used to record the number of scan lines of the scan line, so that the corresponding brightness information of different blocks can be obtained, thereby independently controlling the backlight 200 brightness of each block. Before the brightness information of each block is sent, by triggering the VSYNC signal first, the software can ensure that each segment of Local Dimming data can be sent and processed through the SPI interface at the correct time point, thereby achieving accurate backlight 200 control and high-quality image display; the row counter is used to judge the number of scan lines of the scan line, and the brightness information of each block is obtained in turn in a certain order and the backlight 200 of the corresponding block is lit, avoiding unnecessary backlight 200 being always on, thereby reducing power consumption.
[0093] Example 7:
[0094] refer to Figure 7As shown, as the seventh embodiment of the application, it is a further improvement and refinement of the above-mentioned sixth embodiment. The display panel 100 includes a refresh rate judgment module 160, and the refresh rate judgment module 160 is connected to the image processing module 150. The refresh rate judgment module 160 detects the refresh rate of the next frame and determines whether the refresh rate is greater than or equal to the preset refresh rate. The image processing module 150 obtains the brightness information of N blocks and sends it to the backlight 200 of the display panel 100 N times through the first protocol to light up the backlight 200 of the corresponding block. If it is less than the preset refresh rate, the image processing module 150 obtains the brightness information of the next frame and sends all the brightness information of the next frame to the backlight 200 of the display panel 100 through the first protocol to light up the entire backlight 200 of the display panel 100.
[0095] In this embodiment, by introducing a refresh rate judgment module 160, different brightness information processing strategies are adopted according to different refresh rate conditions, so that the working mode of the display panel 100 can more intelligently adapt to different picture requirements; specifically, the refresh rate judgment module 160 detects the refresh rate of the next frame and compares it with the preset refresh rate. Depending on whether the refresh rate is greater than or equal to the preset refresh rate, two different operating logics are adopted. When the refresh rate meets the preset conditions, the brightness information of the N blocks is obtained respectively and sent to the backlight 200 N times, so as to achieve precise control of each block and ensure the fineness and accuracy of the picture at a high refresh rate; when the detected refresh rate is greater than or equal to the preset refresh rate, the image processing module 150 is triggered to operate in a conventional high-precision mode, that is, the brightness information of the N blocks is obtained one by one and sent in batches to ensure that each block can display the picture according to the accurate brightness, thereby presenting a clear, sharp and ghost-free image effect. When the refresh rate is less than the preset refresh rate, it switches to another working mode. At this time, the image processing module 150 no longer subdivides the blocks, but directly obtains the brightness information of the entire next frame, and then sends the brightness information to the entire backlight 200 through a complete data transmission, so that the entire display panel 100 can be quickly lit with a uniform brightness to keep up with the changing rhythm of the picture and reduce the picture freeze or delay caused by the low refresh rate.
[0096] The preset refresh rate may be a reasonable value pre-set based on factors such as the characteristics of the display panel 100, application scenario requirements, and human visual perception. For example, in a general tablet computer application scenario, the preset refresh rate may be set to 60 Hz, while in some high-end gaming monitor application scenarios, the preset refresh rate may be higher, such as 120 Hz or 144 Hz.
[0097] Example 8:
[0098] refer to Figure 8As shown, as the eighth embodiment of the application, it is a further improvement and refinement of the above-mentioned sixth embodiment. The display panel 100 includes a brightness detection module 170, a backlight current output module 130 and a backlight current regulation module 140. The brightness detection module 170 is connected to the backlight current output module 130 and the backlight current regulation module 140 respectively. The backlight current output module 130 and the backlight current regulation module 140 are electrically connected. The brightness detection module 170 detects the brightness of the display panel 100 corresponding to the first block to the Nth block, and determines whether the brightness of the first block to the Nth block is equal to the ideal brightness value. If so, the backlight current output module 130 outputs the corresponding current to the backlight 200 in the corresponding first block to the Nth block. If not, the backlight current regulation module 140 adjusts the current output by the backlight current output module 130 to output it to the backlight 200 in the corresponding first block to the Nth block.
[0099] In this embodiment, a brightness detection module 170 is provided to detect the brightness of the display panel 100 corresponding to the first block to the Nth block. When the brightness detection module 170 detects that the brightness of each block is equal to the ideal brightness value, the backlight current output module 130 directly outputs the corresponding current to the backlight 200 in the corresponding block to maintain the current ideal brightness state of the backlight 200. When the detected brightness is not equal to the ideal brightness value, the current output by the backlight current output module 130 is appropriately adjusted according to the specific brightness difference, so that the adjusted current can drive the backlight 200 to reach the ideal brightness value. Specifically, the brightness difference is calculated based on the received actual brightness information of each block and the ideal brightness value, and then the current change that needs to be adjusted is calculated based on a certain adjustment algorithm (such as a PID control algorithm, etc.), and finally this change is fed back to the backlight current output module 130 to guide it to adjust the output current. For example, if the actual brightness of a block is lower than the ideal brightness, and it is calculated that a 0.5 mA current increase is required to achieve the ideal brightness, the module will instruct the backlight current output module 130 to increase the current of the block by 0.5 mA. This embodiment can more flexibly cope with different brightness conditions, ensuring that the brightness of the backlight 200 of the display panel 100 is always at an ideal state. Compared with the sixth embodiment, which only mentions adjusting the brightness of the backlight 200 based on brightness information, this embodiment describes the adjustment process in a more specific and detailed manner.
[0100] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.
[0101] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.
Claims
1. A method for adjusting the backlight of a display panel, for adjusting the backlight of a display panel, characterized in that: The adjustment method comprises the following steps: S1: Decompose a frame into N blocks along the transmission direction of the data signal and mark them as the first block, the second block, and so on. S2: In the first block to the Nth block, first obtain the brightness information of the first block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the first block; then obtain the brightness information of the second block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the second block; and so on. Finally, obtain the brightness information of the Nth block and send it to the backlight of the display panel through the first protocol to light up the backlight corresponding to the Nth block; The scanning direction of the display panel is the same as the direction from the first block to the Nth block, and N is a natural number greater than 2.
2. The method for adjusting the backlight of a display panel according to claim 1, wherein: The step of decomposing a frame of image into N blocks along the transmission direction of the data signal and marking them as the first block, the second block, ... the Nth block in sequence may further include the following steps: S0: Detect the refresh rate of the next frame. If the refresh rate is greater than or equal to the preset refresh rate, execute step S1. If it is less than the preset refresh rate, obtain the brightness information of the next frame and send all the brightness information of the next frame to the backlight of the display panel through the first protocol to light up the entire backlight of the display panel.
3. The method for adjusting the backlight of a display panel according to claim 1, wherein: In the step S1 , the number of scan lines in each of the first block to the N−1th block is the same, and the number of scan lines in the Nth block is different from the number of scan lines in the first block.
4. The method for adjusting the backlight of a display panel according to claim 3, wherein: The display panel includes a trigger module and a row counter. The row counter records the number of scan lines. The trigger module triggers the acquisition of brightness information of the corresponding block according to the judgment result of the row counter. Step S2 includes the following steps: Acquire brightness information of the first block, and send the brightness information corresponding to the first block to the backlight of the display panel to light up the backlight corresponding to the first block; count the first row of scan lines in the display panel, and when the number of scan lines is equal to a first preset value, acquire brightness information of the second block; Sending brightness information of the second block to the backlight of the display panel to light up the backlight corresponding to the second block; when the number of scan lines is equal to 2 times the first preset value, obtaining brightness information of the third block; Sending brightness information of the third block to the backlight of the display panel to light up the backlight corresponding to the third block; when the number of scan lines is equal to 3 times the first preset value, obtaining brightness information of the fourth block; …… Sending brightness information of the N-1th block to the backlight of the display panel to light up the backlight corresponding to the N-1th block; when the number of scan lines is equal to N-1 times the first preset value, obtaining the brightness information of the Nth block; The brightness information of the Nth block is sent to the backlight of the display panel to light up the backlight corresponding to the Nth block, thereby lighting up the backlight of the entire display panel; when the frame start signal of the next frame arrives, the brightness information of the first block corresponding to the next frame image is re-acquired and sent to the backlight of the display panel to light up the backlight of the corresponding first block; Wherein, N is a natural number greater than or equal to 6.
5. The method for adjusting the backlight of a display panel according to claim 1, wherein: In step S1, the number of scan lines in each of the first to Nth blocks is the same. The display panel includes a trigger module and a row counter. The row counter records the number of scan lines. The trigger module triggers the acquisition of brightness information of the corresponding block according to the judgment result of the row counter. Step S2 includes the following steps: Acquire brightness information of the first block, and send the brightness information corresponding to the first block to the backlight of the display panel to light up the backlight corresponding to the first block; count the first row of scan lines in the display panel, and when the number of scan lines is equal to a first preset value, acquire brightness information of the second block; Sending brightness information of the second block to the backlight of the display panel to light up the backlight corresponding to the second block; when the number of scan lines is equal to 2 times the first preset value, obtaining brightness information of the third block; Sending brightness information of the third block to the backlight of the display panel to light up the backlight corresponding to the third block; when the number of scan lines is equal to 3 times the first preset value, obtaining brightness information of the fourth block; …… Sending brightness information of the N-1th block to the backlight of the display panel to light up the backlight corresponding to the N-1th block; when the number of scan lines is equal to N-1 times the first preset value, obtaining the brightness information of the Nth block; Sending the brightness information of the Nth block to the backlight of the display panel to light up the backlight corresponding to the Nth block, thereby lighting up the backlight of the entire display panel; when the number of scan lines is equal to N times the first preset value, reacquiring the brightness information of the first block corresponding to the next frame and sending it to the backlight of the display panel to light up the backlight of the corresponding first block; Wherein, N is a natural number greater than or equal to 6.
6. The method for adjusting the backlight of a display panel according to claim 1, wherein: The display panel includes a backlight current output module and a backlight current adjustment module, and the step S2 further includes the following steps: The brightness of the display panel corresponding to the first block to the Nth block is detected to determine whether the brightness of the first block to the Nth block is equal to the ideal brightness value. If so, the backlight current output module outputs the corresponding current to the backlight in the corresponding first block to the Nth block. If not, the backlight current adjustment module adjusts the current output by the backlight current output module to output it to the backlight in the corresponding first block to the Nth block.
7. The method for adjusting the backlight of a display panel according to claim 4 or 5, wherein: The display panel includes a vertical synchronization signal and a data clock signal. Before the brightness information of each block is sent, the vertical synchronization signal is triggered first. The data clock signal is at a low level during the idle time and is valid on the rising edge. The phase between the vertical synchronization signal and the data clock signal is T+△t, where T>0 and △t<10us.
8. A display panel, characterized in that: The backlight corresponding to the display panel is adjusted using the backlight adjustment method of any one of claims 1 to 7, wherein the display panel includes S scan lines, and the S scan lines are divided into N blocks along the transmission direction of the data signal. The display panel includes an image processing module, and the image processing module obtains brightness information of the N blocks and sends it to the backlight of the display panel N times through the first protocol of the serial peripheral interface to light up the backlight of the corresponding block.
9. The display panel according to claim 8, wherein: The display panel includes a refresh rate judgment module, which is connected to the image processing module. The refresh rate judgment module detects the refresh rate of the next frame and determines whether the refresh rate is greater than or equal to the preset refresh rate. The image processing module obtains brightness information of N blocks and sends it to the backlight of the display panel N times through the first protocol to light up the backlight of the corresponding blocks. If it is less than the preset refresh rate, the image processing module obtains the brightness information of the next frame and sends all the brightness information of the next frame to the backlight of the display panel through the first protocol to light up the entire backlight of the display panel.
10. The display panel according to claim 8, wherein The display panel includes a brightness detection module, a backlight current output module and a backlight current regulation module. The brightness detection module is connected to the backlight current output module and the backlight current regulation module respectively. The backlight current output module and the backlight current regulation module are electrically connected. The brightness detection module detects the brightness of the display panel corresponding to the first block to the Nth block, and determines whether the brightness of the first block to the Nth block is equal to the ideal brightness value. If so, the backlight current output module outputs the corresponding current to the backlight in the corresponding first block to the Nth block. If not, the backlight current regulation module adjusts the current output by the backlight current output module to output it to the backlight in the corresponding first block to the Nth block.