Display device and control method

Abstract

A display device and a control method, the control method comprising: sending local dimming data to a backlight controller (30), so that the backlight controller (30) sends the local dimming data to a backlight driver (20), and the backlight driver (20) sends a driving signal to a backlight region (10), wherein the local dimming data is generated on the basis of image data of the current frame; and controlling a display panel (200) to perform display after delaying for a first preset time upon receiving the image data of the current frame, wherein the first preset time is preset, and the first preset time is the difference between the moment when the backlight driver (20) sends the driving signal to the backlight region (10) and the moment when the display panel (200) receives the image data of the current frame. In this way, the display performance of a display device is improved.

Description

Display device and control method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 28, 2024, with application number 202410222670.1 and application name “Display Device and Control Method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of display, and in particular to a display device and a control method. Background Art

[0003] With the development of technology, display devices have become important components of many electronic devices. Display devices are usually composed of a display panel and a backlight unit. The backlight unit is used to provide a backlight source for the display panel.

[0004] The data that controls the backlight unit's illumination is typically called local dimming data, while the data that controls the LCD panel's display is called image data. Local dimming data is generated based on image data, so there can be a mismatch between when the display panel receives the image data and when the backlight unit receives the backlight data, which can degrade the display quality. Summary of the Invention

[0005] The present application provides a control method for a display device, wherein the display device includes a display panel and a backlight unit, wherein the backlight unit includes a backlight controller, a backlight driver, and a backlight area. The method includes:

[0006] Sending local dimming data to a backlight controller, causing the backlight controller to send the local dimming data to a backlight driver, which sends a driving signal to the backlight area, wherein the local dimming data is generated based on image data of a current frame;

[0007] The display panel is controlled to display after a first preset time delay after receiving the image data of the current frame, wherein the first preset time is the difference between the moment when the backlight driver sends the driving signal to the backlight area and the moment when the display panel receives the image data of the current frame.

[0008] Some embodiments of the present application provide a display device, which includes a main controller, a display panel and a backlight unit. The backlight unit includes a backlight controller, a backlight driver and a backlight area. The main controller is used to implement the methods involved in the above embodiments.

[0009] Some embodiments of the present application provide a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods involved in the above embodiments.

[0010] The display device and control method provided by some embodiments of the present application send local dimming data to the backlight controller, so that the backlight controller sends the local dimming data to the backlight driver, and the backlight driver sends a driving signal to the backlight area. The moment when the backlight driver sends the driving signal to the backlight area is the moment when the backlight area is illuminated. The first preset time is the difference between the moment when the backlight driver sends the driving signal to the backlight area and the moment when the image data of the current frame is received. After receiving the image data of the current frame, the display panel delays the display for the first preset time, thereby enabling the display panel and the backlight area to work synchronously, thereby improving the display quality of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic diagram of a display device with a direct backlight using local dimming technology;

[0012] FIG2 is a schematic diagram of a display device using a direct backlight and an AM driving mode;

[0013] FIG3 is a schematic diagram of a specific structure of a backlight unit;

[0014] FIG4 is a control method for a display device provided by some embodiments of the present application;

[0015] FIG5 is a schematic diagram of a timing control method for a display device according to some embodiments of the present application;

[0016] FIG6 is another timing control diagram of a display device provided by some embodiments of the present application;

[0017] FIG7 is another timing control schematic diagram of a display device provided by some embodiments of the present application;

[0018] FIG8 is a schematic diagram of another timing control method of a display device provided by some embodiments of the present application;

[0019] FIG9 is another timing control diagram of a display device provided by some embodiments of the present application;

[0020] FIG10 is a specific structure of a backlight unit provided in some embodiments of the present application;

[0021] FIG11 is a specific structure of another backlight unit provided in some embodiments of the present application;

[0022] FIG12 is a schematic diagram of a data structure of a data packet sent by a backlight controller to a column of backlight drivers;

[0023] FIG13 shows a specific structure of another backlight unit provided in some embodiments of the present application.

[0024] Reference numerals: 10, backlight area; 20, backlight driver; 30, backlight controller; 40, pixel; 100, backlight unit; 200, display panel; 300, main controller; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0025] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0026] Display device backlighting methods include direct backlighting and edge backlighting. Edge backlighting means that the backlight source is located on the side of the display panel, and the light is transmitted to the center of the screen through the light guide plate. Direct backlighting means that the backlight source is located on the back of the display panel.

[0027] Figure 1 is a schematic diagram of a display device with a direct backlight using local dimming technology. As shown in Figure 1, in order to reduce the power loss of the backlight panel, Mini Light-Emitting Diode (Mini-LED) technology is introduced. Mini-LED can be used as a backlight source to achieve regional dimming, also known as local dimming technology. The brightness of the backlight source in each backlight area 10 can be controlled individually. A backlight area 10 can be composed of at least one Mini-LED, and a backlight area 10 can have multiple Mini-LEDs or only one Mini-LED. In addition, a backlight area 10 corresponds to the area where n×m pixels 40 are located in the display panel 200. For example, in Figure 1, one backlight area 10 corresponds to the area where 2×2 liquid crystal pixels 40 are located.

[0028] There are two main driving modes for Mini-LED as a backlight source: Passive Matrix (PM) driving mode and Active Matrix (AM) driving mode.

[0029] In PM drive mode, the anodes of each column of Mini-LEDs in the Mini-LED array are connected to the column scan line, while the cathodes of each row of Mini-LEDs are connected to the row scan line. When the b-th column scan line and the a-th row scan line are selected, the Mini-LED at their intersection (a, b) is illuminated. This high-speed, point-by-point scanning of the entire screen creates a display.

[0030] In the AM driving mode, multiple backlight drivers 20 (Dimmers) are set. One backlight driver 20 can control the Mini-LEDs in multiple backlight areas 10, or can control the Mini-LEDs in one backlight area 10 without any restriction.

[0031] Figure 2 is a schematic diagram of a display device that uses a direct backlight and an AM drive mode. As shown in Figure 2, the display device includes a main controller 300, a backlight unit 100 (Back Light Unit, abbreviated as: BLU) and a display panel 200. The main controller 300 is used to generate image data (Display Data) and local dimming data (Local Dimming Data) based on video data, and the image data is used to drive the display panel 200 to work. The main controller 300 is also used to generate local dimming data for each backlight area 10 based on the video data, and send the local dimming data for each backlight area 10 to the backlight driver 20 of each Mini-LED (not shown in the figure). The backlight driver 20 supplies a driving signal to the Mini-LED, and the driving signal can control the luminous brightness of the Mini-LED, thereby providing backlights of different brightness.

[0032] FIG3 is a schematic diagram of a specific structure of a backlight unit 100. As shown in FIG3 , the backlight unit 100 includes a backlight controller 30, a backlight driver 20, and backlight regions 10. The backlight controller 30 is connected to the backlight driver 20, which is in turn connected to the backlight regions 10. The backlight controller 30 is configured to send local dimming data to each backlight driver 20, and the backlight driver 20 is configured to illuminate the backlight regions 10 based on the local dimming data.

[0033] Since the local dimming data is generated based on the image data, there may be a time when the display panel receives the image data and a time when the backlight unit receives the backlight data that is not synchronized, thereby reducing the display effect of the display device.

[0034] FIG4 is a control method for a display device provided by some embodiments of the present application. As shown in FIG4 , the control method is executed in the main controller 300 and specifically includes the following steps:

[0035] S101 : The main controller 300 sends the local dimming data of the current frame to the backlight controller 30 , which enables the backlight controller 30 to send the local dimming data to the backlight driver 20 , and the backlight driver 20 sends a driving signal to the backlight area 10 .

[0036] The local dimming data of the current frame is generated based on the image data of the current frame.

[0037] The main controller 300 obtains the image data of the current frame and generates the local dimming data of the current frame using a preset dimming algorithm. An existing dimming algorithm can be used and will not be described in detail here.

[0038] After obtaining the local dimming data of the current frame, the main controller 300 sends the local dimming data of the current frame to the backlight controller 30. The backlight controller 30 processes the local dimming data of the current frame and sends it to the backlight driver 20. The processing process of the backlight controller 30 can be data protocol conversion, and can also group the local dimming data so that the backlight driver 20 can control the corresponding backlight area 10 to emit light. There is no restriction this time.

[0039] After receiving the local dimming data of the current frame, the backlight driver 20 processes the local dimming data of the current frame to generate a driving signal, and the driving signal is used to drive the backlight area 10 to emit light.

[0040] S102 , the main controller 300 controls the display panel 200 to display the image data of the current frame after delaying for a first preset time after receiving the image data of the current frame.

[0041] The first preset time is preset, and the first preset time is the difference between the moment when the backlight driver 20 sends the driving signal to the backlight area 10 and the moment when the display panel 200 receives the image data of the current frame.

[0042] The moment when the display panel 200 receives the image data of the current frame is defined as time T0, and the moment when the backlight driver 20 sends the driving signal to the backlight area 10 is defined as time T1 when the backlight area 10 is illuminated. The first preset time is ΔT, which is the difference between time T1 and time T0. After receiving the image data of the current frame, the display panel 200 delays the display of the image data of the current frame for the first preset time, that is, the main controller 300 controls the display panel 200 to display at time T0+ΔT. In this way, the display panel 200 can also display the image data of the current frame at time T1, and the backlight area is also illuminated at time T1 based on the local dimming data of the current frame. In this way, the display panel 200 and the backlight area 10 can operate synchronously, improving the display quality of the display device and avoiding ghosting and tail phenomena.

[0043] The following description is made in conjunction with FIG5 , which is a timing control schematic diagram of a display device. As shown in FIG5 , at time T0, the main controller 300 receives the Fn-th frame image, processes the Fn-th frame image using a preset dimming algorithm to generate local dimming data, and sends the local dimming data to the backlight controller 30 at time T11. The backlight controller 30 processes the local dimming data and sends the local dimming data to the backlight driver 20 at time T12. At time T1, the backlight driver 20 generates a drive signal based on the local dimming data. The drive signal is used to control the backlight area 10 to emit light, that is, the backlight area is also illuminated at time T1 based on the local dimming data of the current frame. In order to ensure the synchronization between the display panel 200 and the backlight area 10, the display panel 200 also displays the image data of the current frame at time T1. Among them, the timing of the Fn+1 frame image is the same as the timing of the Fn-th frame image, and will not be repeated here.

[0044] It should also be noted here that since the image data of the current frame is delayed by the first preset time, in order to ensure display quality, the current image data continues to be displayed after receiving the image data of the next frame, and the continued display time is also the first preset time, thus ensuring that the display time of a frame of image data remains unchanged.

[0045] In some embodiments, the first preset time is obtained by testing or calculation. More specifically, the time for the main controller 300 to process the image data using the preset dimming algorithm is fixed, that is, the time difference between time T0 and time T11 can be calculated in advance. The time for the backlight controller 30 to process the local dimming data is fixed, that is, the time difference between time T11 and time T12 can be calculated. The time for the backlight driver 20 to process the local dimming data is also fixed, that is, the time difference between time T12 and time T1 can be calculated.

[0046] In summary, the time delay between time T1 and time T0 can be obtained by calculation, and the display time of the display panel 200 can be determined based on the time delay between time T1 and time T0, so as to ensure the synchronization between the display panel 200 and the backlight area 10.

[0047] This time, the time delay between time T0 and time T1 is not limited to being obtained by calculation, and the time delay between time T0 and time T1 can also be obtained by measurement.

[0048] To further improve the display effect of the display device, the main controller 300 needs to send control data to the backlight controller 30 in addition to the local dimming data. The control data may include one or more combinations of an address, data length, and data type. The control data may also include other data in addition to the local dimming data, which is not limited at this time.

[0049] For example, in order to improve the display quality of a display device, it is usually necessary to further divide the backlight area 10 into smaller parts, that is, the number of backlight areas 10 increases, and the number of backlight drivers 20 increases, which requires more backlight controllers 30. In addition, multiple backlight drivers 20 are usually connected in series and then connected to the backlight controller 30. In order to further improve the frame rate, more backlight controllers 30 are also needed to reduce the number of backlight drivers 20 connected in series. In this way, the data transmission distance between the main controller 300 and the backlight driver 20 is shortened, reducing the delay caused by data transmission, which can improve the frame rate, but it increases the complexity of the system. Although, when using the currently used interface protocol to build a system, the display time of the display panel can be adjusted to synchronize the display panel and the backlight unit to improve the image quality, in order to adapt to different numbers of backlight drivers 20 and backlight controllers 30, it is necessary to continuously adjust the display time of the display panel and test whether the display panel is synchronized with the backlight unit, which takes a long time, and there is still a situation where synchronization between the backlight and the display panel 200 cannot be achieved.

[0050] For another example, multiple backlight controllers 30 can be connected in cascade to the main controller 300. For cascaded backlight controllers 30, control data needs to be added to the data packet to enable data packet transmission among the multiple backlight controllers 30. For example, by adding device addresses, communication protocol specifications, etc.

[0051] Due to changes in the display requirements of display devices, the length of control data is not fixed. For example, if the number of backlight controllers 30 and backlight drivers 20 increases, the length of control data will change. Furthermore, control data must be sent before local dimming data. This causes the time when the backlight driver 20 receives the local dimming data to change, which in turn causes the time when the backlight area 10 is illuminated to change. This can cause the backlight area 10 to be illuminated to be out of sync with the display device's start of display.

[0052] As an example, Figure 6 shows another timing control diagram for a display device. As shown in Figure 6, at time T0, the main controller 300 receives the Fnth frame image and processes it using a preset dimming algorithm to generate local dimming data and corresponding control data. Because local dimming data is calculated based on image data, it cannot be sent immediately after receiving the image data. Compared to local dimming data, control data can be obtained in advance, so the control data can be sent before the local dimming data is sent.

[0053] As shown in Figure 6, the main controller 300 sends control data at time T0, and the data length of the control data is two unit lengths, and then sends local dimming data. After receiving the control data and local dimming data, the backlight controller 30 sends the control data and local dimming data to the backlight driver 20. The backlight driver 20 sends a drive signal to the backlight area 10 at time T1. Among them, the unit length can be defined as required and is used to measure the length of the control data. As shown in Figure 7, the main controller 300 sends control data at time T0, and the data length of the control data is three unit lengths. It then sends local dimming data. Since the control data becomes longer, the backlight driver 20 sends a drive signal to the backlight area 10 at time T01, which is delayed by a time ΔT1 compared to the original time T1.

[0054] That is, the time when the backlight driver 20 sends the driving signal to the backlight area 10 will change with the length of the control data, which will make the display panel 200 unable to synchronize with the backlight area 10. In order to further improve the display quality of the display device, other embodiments of the present application provide a control method for the display device. The control method is executed by the main controller 300 and specifically includes the following steps:

[0055] S201. If the data length of the control data of the current frame is the preset length, at the beginning of the current frame, the main controller 300 sends the control data of the current frame and the local dimming data of the current frame to the backlight controller 30 in sequence, so that the backlight controller 30 sends the control data of the current frame and the local dimming data of the current frame to the backlight driver 20 in sequence within the current frame, and the backlight driver 20 sends a driving signal to the backlight area 10 and proceeds to S204.

[0056] The preset length is determined based on the amount of data that can be transmitted within a target time period. The target time period refers to the time between the moment the main controller 300 receives the image data of the current frame and the moment the local dimming data is generated. The start time of the current frame is the moment the main controller 300 receives the image data of the current frame. When the data length of the control data of the current frame is the preset length, at the start time of the current frame, the main controller 300 sends the control data of the current frame and the local dimming data of the current frame to the backlight controller 30 in sequence. This does not change the time when the main controller 300 sends the local dimming data, that is, the time when the main controller 300 sends the local dimming data remains at time T11. This does not change the time when the backlight controller 30 sends the local dimming data to the backlight driver 20, that is, the time when the backlight controller 30 sends the local dimming data remains at time T12. It also does not change the time when the backlight driver 20 sends the drive signal to the backlight area 10, that is, the time when the backlight driver 20 sends the drive signal remains at time T1, thereby synchronizing the display panel 200 with the backlight area 10.

[0057] S202. If the data length of the control data of the current frame is greater than the preset length, the main controller 300 sends the second part of the data, the local dimming data of the current frame and the third part of the data to the backlight controller 30 in sequence at the beginning of the current frame, so that the backlight controller 30 sends the second part of the data, the local dimming data of the current frame and the third part of the data to the backlight driver 20 in sequence within the current frame, and the backlight driver 20 sends a driving signal to the backlight area 10.

[0058] Among them, the control data of the current frame includes a first part of data and a second part of data, the data length of the second part of data is a preset length, the first part of data is sent by the main controller 300 to the backlight controller 30 in the previous frame, and the sending time of the first part of data is later than the sending time of the local dimming data of the previous frame.

[0059] The control data for the next frame includes a third portion of data and a fourth portion of data. The third portion of data is sent to the backlight controller 30 in the current frame and is sent later than the local dimming data for the current frame. The fourth portion of data is sent to the backlight controller 30 in the next frame and has a data length of a preset length.

[0060] Among them, if it is determined that the data length of the control data of the current frame is greater than the preset length, the control data of the current frame is split into a first part of data and a second part of data, and the length of the second part of data is made to be the preset length. In this way, when the main controller 300 sends the second part of data, the local dimming data of the current frame and the third part of data to the backlight controller 30 in the current frame, it will not change the moment when the backlight controller 30 receives the local dimming data of the current frame, and will not change the moment when the backlight driver 20 receives the local dimming data of the current frame, and will not affect the time when the backlight area 10 receives the driving signal. That is, when the length of the control data changes, the same first preset time can be used to control the display panel 200 for display.

[0061] The first part of the data is sent from the main controller 300 to the backlight controller 30 in the previous frame, which ensures that the control data is sent before the local dimming data, and the sending time of the first part of the data is later than the sending time of the local dimming data of the previous frame. In this way, the first part of the data will not affect the sending time of the local dimming data of the previous frame, will not change the time when the backlight controller 30 receives the local dimming data of the previous frame, and will not change the time when the backlight driver 20 receives the local dimming data of the previous frame, and will not affect the time when the backlight area 10 receives the driving signal in the previous frame.

[0062] The following example illustrates another timing control scheme for a display device, using FIG8 . As shown in FIG8 , the control data length of the Fn+1 frame is three unit lengths, and the control data of the Fn+1 frame is divided into a first portion of data and a second portion of data. The first portion of data has a data length of one unit length, and the second portion of data has a data length of two unit lengths. The first portion of data is transmitted within the Fn frame and after the local dimming data of the Fn frame. The second portion of data is transmitted within the Fn+1 frame and before the local dimming data of the Fn+1 frame. This ensures that the drive signal for the Fn+1 frame is transmitted at time T3, allowing the display panel 200 to be controlled using a fixed first preset time. A third portion of data is also transmitted after the local dimming data of the Fn+1 frame. The control data of the Fn+2 frame includes the third portion of data and a fourth portion of data. The fourth portion of data has a preset data length, ensuring that the transmission timing of the drive signal for the Fn+1 frame remains unchanged.

[0063] In some embodiments, if the image data of the current frame is the image data of the last frame, and the data length of the control data of the current frame is greater than the preset length, the main controller 300 sends the second part of the data and the local dimming data of the current frame to the backlight controller 30 in the current frame, so that the backlight controller 30 sends the second part of the data and the local dimming data of the current frame to the backlight driver 20 in the current frame, and the backlight driver 20 sends a driving signal to the backlight area 10.

[0064] S203 : If the data length of the control data of the current frame is less than the preset length, the control data of the current frame and the local dimming data of the current frame are sent to the backlight controller 30 in sequence after being delayed by a fourth preset delay time at the start time of the current frame.

[0065] Among them, the fourth preset delay time is calculated based on the data length of the control data of the current frame. More specifically, the transmission time of the control data of the current frame is calculated, and the sending time of the control data of the current frame is determined based on the transmission time of the control data of the current frame. The fourth preset delay time can be obtained based on the sending time of the control data of the current frame and the start time of the current frame.

[0066] In some embodiments, determining the sending time of the control data of the current frame according to the transmission time of the control data of the current frame specifically includes: determining the sending time of the control data of the current frame according to the transmission time of the control data of the current frame and the time of generating local dimming data.

[0067] The following example illustrates another timing control diagram for a display device, using FIG9 . As shown in FIG9 , the control data length of the Fn frame is one unit length. The transmission time for transmitting one unit length of control data is calculated to be ΔT2. The time when the local dimming data is generated is T03. Therefore, the transmission time of the control data for the current frame is determined to be T04 = T03 - ΔT2. Therefore, the fourth preset delay time can be determined to be T0 - T04.

[0068] S204 , the main controller 300 controls the display panel 200 to display the image data of the current frame after delaying for a first preset time after receiving the image data of the current frame.

[0069] In the above technical solution, the main controller 300 sends control data and local dimming data to the backlight controller 30. When the data length of the control data is greater than the preset length, the control data is split into two parts, and the data length of the second part of the data is the preset length. The second part of the data and the local dimming data of the current frame are sent to the main controller, so that the receiving time of the local dimming data can be maintained unchanged, and the time when the backlight area 10 is illuminated can be maintained unchanged. When the data length of the control data is less than the preset length, the time of sending the control data is delayed, so that the receiving time of the local dimming data can be maintained unchanged, and the time when the backlight area 10 is illuminated can be maintained unchanged. That is, the control method provided by the present application uses a fixed first preset time and can adapt to control data of different lengths.

[0070] In some embodiments, the backlight unit 100 includes multiple backlight drivers 20, which are cascade-connected. This allows each backlight driver 20 to receive local dimming data at different times. Based on the above backlight unit architecture, in order to further improve display performance, some embodiments of the present application also provide a control method for a display device. The control method is executed by a main controller 300 and specifically includes the following steps:

[0071] S301 , the main controller 300 controls the target driver to light up the corresponding backlight area 10 upon receiving the local dimming data of the current frame, and controls the intermediate driver to light up the corresponding backlight area 10 after delaying for a second preset time after receiving the local dimming data of the current frame.

[0072] The target driver is the backlight driver 20 that receives the local dimming data of the current frame last, and the intermediate drivers are the backlight drivers 20 other than the target driver.

[0073] The first preset time is the difference between the time when the target driver sends the driving signal of the current frame to the backlight area 10 and the time when the display panel 200 receives the image data of the current frame.

[0074] One intermediate driver corresponds to one second preset time, and the second preset time is the difference between the time when the intermediate driver receives the local dimming data of the current frame and the time when the target driver receives the local dimming data of the current frame.

[0075] Among them, taking the backlight driver 20 that receives the local dimming data of the current frame last among the multiple backlight drivers 20 as a reference, the display panel 200 displays an image at the moment when the backlight driver 20 that receives the local dimming data of the current frame last lights up the backlight area 10.

[0076] The intermediate driver is controlled to light up the corresponding backlight area 10 after a second preset time delay after receiving the local dimming data of the current frame. That is, the intermediate backlight driver 20 also lights up the controlled backlight area 10 at the moment when the backlight driver 20 that last receives the local dimming data of the current frame lights up the backlight area 10. In this way, each backlight area 10 is lit at the same time, and the display panel 200 can also be displayed synchronously with each backlight area 10, thereby improving the display performance of the display device.

[0077] Figures 10 and 11 both illustrate the specific structure of a backlight unit 100. As shown in Figures 10 and 11, the backlight unit 100 includes a plurality of backlight drivers 20, each of which is connected to a backlight region 10. The plurality of backlight drivers 20 are spaced apart in a first direction X, and the plurality of backlight drivers 20 are spaced apart in a second direction Y. The backlight drivers 20 spaced apart in the first direction X are referred to as a row of backlight drivers 20. The backlight drivers 20 spaced apart in the second direction Y are referred to as a column of backlight drivers 20.

[0078] At least one backlight controller is connected to the main controller, and at least one backlight controller is connected to the main controller, specifically including: In Figure 10, the backlight unit 100 includes only one backlight controller 30, the backlight controller 30 is connected to each column of backlight drivers, and the backlight controller 30 is connected to the main controller 40. In Figure 11, the backlight unit 100 includes multiple backlight controllers 30, each backlight controller 30 is connected to multiple columns of backlight drivers, and each backlight controller 30 is connected to the main controller 40.

[0079] Each column of backlight drivers 20 is provided with a target driver. The current column driver is any column of backlight drivers 20, the current driver is any intermediate driver in the current column of drivers, and the current target driver is the target driver of the current column driver. The second preset time corresponding to the current driver is determined based on the number of intervals and the transmission time for data transmission between two adjacent backlight drivers 20. The number of intervals is the number of backlight drivers 20 between the current driver and the current target driver.

[0080] The following explanation is respectively given in conjunction with Figures 10 and 11. As shown in Figure 10, the backlight driver 20 in the i-th row and j-th column is called the backlight driver D0(i,j), i represents the number of rows of the backlight driver, j represents the number of columns of the backlight driver, 1≤i≤M, 1≤j≤N.

[0081] The backlight drivers 20 in a column of backlight drivers 20 are connected in sequence. Here, taking the first column of backlight drivers 20 as an example, backlight driver D0(1,1) and backlight driver D0(2,1) are connected via a signal line, backlight driver D0(2,1) and backlight driver D0(3,1) are connected via a signal line, and so on. Backlight driver D0(M-1,1) and backlight driver D0(M,1) are connected via a signal line.

[0082] When the number of backlight drivers 20 is relatively small, a single backlight controller 30 may be provided. The backlight controller 30 is connected to the first-level backlight driver 20 in each column of backlight drivers 20. For example, the backlight controller 30 is connected to backlight driver D0(1,1), backlight driver D0(1,2), ..., and backlight driver D0(1,N). The main controller 300 transmits image data to the display panel 200. The main controller 300 transmits local dimming data to the backlight controller 30. The backlight controller 30 transmits the local dimming data of the backlight driver in the jth column to the first-level backlight driver D0(1,j) in the jth column of backlight drivers 20, where j is a positive integer and traverses from 1 to N.

[0083] Backlight driver D0 (M, 1), backlight driver D0 (M, 2), ... backlight driver D0 (M, N) are all target drivers and receive local dimming data at the same time.

[0084] Backlight driver D0(s,j) intermediate driver. s represents the number of rows of the backlight driver, 1≤s<M, s is a positive integer, s traverses from 1 to (M-1), 1≤j≤N, j is a positive integer, j traverses from 1 to N. The current target driver is the backlight driver D0(M,j), and the difference between the current backlight driver D0(s,j) and the backlight driver D0(M,j) is (Ms) backlight drivers 20, then the second preset time of the current backlight driver D0(s,j) is (Ms) times the transmission time for data transmission between two adjacent backlight drivers 20. The transmission time for data transmission between two adjacent backlight drivers 20 can be obtained by testing or by calculation. It will not be repeated here.

[0085] As shown in FIG11 , the backlight unit is provided with L backlight controllers. The backlight driver 20 connected to the backlight controller 30 of the kth level is called D. k (i, j), 1≤i≤M, 1≤j≤N, 1≤k≤L.

[0086] In the backlight driver 20 controlled by the backlight controller 30 of the kth stage, the backlight driver D k (M, 1), backlight driver D k (M, 2), ...backlight driver D k(M, N) are both target drivers and finally receive the local dimming data.

[0087] Backlight Driver D k (s, j) intermediate driver. 1≤k≤L, k is a positive integer, k traverses from 1 to L. 1≤s≤(M-1), s is a positive integer, s traverses from 1 to (M-1). 1≤j≤N, j is a positive integer, j traverses from 1 to N. The current target driver is the backlight driver D k (M, j), current backlight driver D k (s, j) and backlight driver D k There is a difference of (Ms) backlight drivers 20 between (M, j), so the current backlight driver D k The second preset time (s, j) is (Ms) times the transmission time for data transmission between two adjacent backlight drivers 20 .

[0088] FIG12 is a schematic diagram of the data structure of a data packet sent by the backlight controller 30 to a column of backlight drivers 20. As shown in FIG12 , the data packet includes control data and local dimming data. The local dimming data includes M data items, sequentially labeled as data A1, data A2, ..., and data AM. Taking the first column of backlight drivers 20 in FIG10 as an example, data A1 is the data corresponding to backlight driver D0(1,1), data A2 is the data corresponding to backlight driver D0(2,1), ..., and data AM is the data corresponding to backlight driver D0(M,1). The local dimming data is transmitted from the first-stage backlight driver 20 to the last-stage backlight driver 20 in a column of backlight drivers 20, so that each stage of backlight drivers can receive the corresponding local dimming data.

[0089] FIG13 shows a specific structure of a backlight unit 100. As shown in FIG13 , in order to further improve image quality and increase frame rate, the backlight area 10 needs to be further divided. As the number of backlight areas 10 increases, more backlight drivers 20 need to be provided. When the number of backlight drivers 20 is relatively large, multiple backlight controllers 30 can be provided. One backlight controller 30 is connected to multiple columns of backlight drivers 20. The backlight controller 30 sends local dimming data to each column of the connected backlight drivers 20. Multiple backlight controllers 30 are connected in cascade, and the backlight controller 30 at the first level is connected to the main controller 300.

[0090] In some embodiments, each column of backlight drivers 20 connected to the last stage backlight controller 30 is referred to as a target column driver. Each column of target column drivers is provided with a target driver, which is the last stage backlight driver 20 in each column of target column drivers.

[0091] If the current column driver is the target column driver, the current driver is any intermediate driver in the current column driver, and the current target driver is the target driver of the current column driver, the second preset time corresponding to the current driver is determined based on the number of intervals and the transmission time for data transmission between two adjacent backlight drivers 20, and the number of intervals is the number of backlight drivers 20 between the current driver and the current target driver.

[0092] Continuing to refer to FIG13, the backlight unit is provided with L backlight controllers, each backlight controller controls M×N backlight drivers, where M is the number of rows of backlight drivers and N is the number of columns of backlight drivers. For ease of description, the backlight driver 20 connected to the qth level backlight controller 30 is referred to as the backlight driver D. q (i, j), 1≤q≤(L-1), 1≤i≤M, 1≤j≤N, q, i and j are all positive integers, and the backlight driver 20 connected to the backlight controller 30 of the Lth level is called the backlight driver D L (i, j).

[0093] The target column driver is the backlight controller 30 of the Lth level connected to each column backlight driver, and the target driver is the backlight driver D L (M, 1), backlight driver D L (M, 2), ...backlight driver D L (M, N).

[0094] The backlight drivers 20 controlled by the qth-level backlight controller 30 are all intermediate drivers. Among the backlight drivers 20 controlled by the Lth-level backlight controller 30, backlight driver Dq(1, j), backlight driver Dq(2, j), ..., backlight driver Dq(M-1, j) are all intermediate drivers, and j traverses from 1 to N.

[0095] s represents the number of rows of backlight drivers, 1≤s≤(M-1), s is a positive integer, s traverses from 1 to (M-1), 1≤j≤N, j traverses from 1 to N. In the intermediate driver 20 controlled by the backlight controller 30 of the Lth level, the current target driver is the backlight driver D L (M, j), current backlight driver D L (s, j) and backlight driver D L There is a difference of (Ms) backlight drivers 20 between (M, j), so the current backlight driver D L The second preset time (s, j) is (Ms) times the transmission time for data transmission between two adjacent backlight drivers 20 .

[0096] In some embodiments, the backlight controllers other than the last-level backlight controller 30 are referred to as intermediate controllers, and the columns of backlight drivers 20 connected to the intermediate controllers are referred to as intermediate column drivers. Each column of intermediate column drivers is provided with a reference driver, which is the last-level backlight driver 20 in each column of intermediate column drivers.

[0097] If the current column driver is an intermediate column driver, the current driver is any intermediate driver in the current column driver except the reference driver, the second preset time corresponding to the current driver is determined based on the third preset time and the time adjustment value, the third preset time is determined based on the number of intervals and the transmission time for data transmission between two adjacent backlight drivers 20, the number of intervals is the number of backlight drivers 20 between the current driver and the current reference driver, and the current reference driver is the reference driver of the current column driver.

[0098] The time adjustment value is determined according to the data transmission time difference between the backlight controller 30 corresponding to the current driver and the backlight controller 30 at the last stage.

[0099] The qth level backlight controller 30 is an intermediate controller, 1≤q≤(L-1), q is a positive integer, and q ranges from 1 to (L-1). The jth column backlight driver 20 controlled by the qth level backlight controller 30 is an intermediate column driver. q (M, j) is the reference driver, 1≤j≤N, j traverses from 1 to N. Current backlight driver D q (s, j) and the current reference driver D q There are (Ms) backlight drivers 20 between (M, j), 1≤s<M, s is a positive integer, and s ranges from 1 to (M-1). Then the current backlight driver D q The third preset time of (s, j) is (Ms) times the transmission time of data transmission between two adjacent backlight drivers 20, so the current backlight driver D q The second preset time of (s, j) is determined according to the third preset time and the time adjustment value. q The time adjustment value of (s, j) is the data transmission time difference between the qth level backlight controller and the Lth level backlight controller.

[0100] In some embodiments, the backlight controllers other than the last-level backlight controller 30 are referred to as intermediate controllers, and the columns of backlight drivers 20 connected to the intermediate controllers are referred to as intermediate column drivers. Each column of intermediate column drivers is provided with a reference driver, which is the last-level backlight driver 20 in each column of intermediate column drivers.

[0101] If the current column driver is an intermediate column driver and the current driver is a reference driver among the current column drivers, the second preset time corresponding to the current driver is a time adjustment value, wherein the time adjustment value is determined based on the data transmission time difference between the backlight controller 30 corresponding to the current driver and the last-stage backlight controller 30.

[0102] The backlight controller 30 at the qth level is an intermediate controller, 1≤q≤(L-1), q is a positive integer, and q ranges from 1 to (L-1). The jth column backlight driver 20 controlled by the qth level backlight controller 30 is an intermediate column driver. q (M, j) is the reference driver, 1≤j≤N, j traverses from 1 to N. Reference driver D q (M, 1), reference driver D q (M, 2), ..., reference driver D q The second preset time corresponding to (M, N) is a time adjustment value. q The time adjustment value of (M, j) is the data transmission time difference between the qth level backlight controller and the Lth level backlight controller.

[0103] It should be noted that the high level and low level referred to in the above embodiments are relative concepts (i.e., the voltage value of the high level is higher than the voltage value of the corresponding low level), and do not limit the specific voltage value of the high level or the specific voltage value of the low level. Furthermore, this embodiment does not limit the high levels applied to different signal lines to be equal. Those skilled in the art will understand that the corresponding high and low level values ​​can be set according to the process node, speed requirements, reliability requirements, etc.

[0104] An embodiment of the present application provides a main controller, which includes a memory and a processor.

[0105] Wherein, the memory is used to store computer-executable instructions executable by the processor;

[0106] The processor implements each step of the method in the above embodiment when executing the computer-executable instruction. For details, please refer to the relevant description of the above method embodiment.

[0107] Optionally, the memory can be independent or integrated with the processor. When the memory is independent, the main controller further includes a bus for connecting the memory and the processor.

[0108] An embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, each step of the method in the above embodiment is implemented.

[0109] Some embodiments of the present application also provide a display device, which includes a main controller, a display panel and a backlight unit. The backlight unit includes a backlight controller, a backlight driver and a backlight area. The main controller is used to implement the methods involved in the above embodiments.

[0110] An embodiment of the present application further provides a computer program product, including computer-executable instructions, which implement the various steps of the method in the above embodiment when executed by a processor.

[0111] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0112] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for controlling a display device, characterized in that: The display device includes a display panel and a backlight unit, the backlight unit includes a backlight controller, a backlight driver, and a backlight area, and the method includes: Sending local dimming data to the backlight controller, so that the backlight controller sends the local dimming data to the backlight driver, and the backlight driver sends a driving signal to the backlight area, wherein the local dimming data is generated based on the image data of the current frame; The display panel is controlled to display after a first preset time delay after receiving the image data of the current frame, wherein the first preset time is the difference between the moment when the backlight driver sends the driving signal to the backlight area and the moment when the display panel receives the image data of the current frame.

2. The control method according to claim 1, characterized in that: Sending local dimming data to the backlight controller specifically includes: If the data length of the control data of the current frame is greater than the preset length, the second portion of data, the local dimming data of the current frame, and the third portion of data are sent to the backlight controller in sequence at the start time of the current frame; Among them, the control data of the current frame includes a first part of data and a second part of data, the data length of the second part of data is the preset length, the first part of data is sent to the backlight controller in the previous frame, and the sending time of the first part of data is later than the sending time of the local dimming data of the previous frame; the control data of the next frame includes the third part of data and a fourth part of data, the third part of data is sent to the backlight controller in the current frame, and the third part of data is sent later than the local dimming data of the current frame, the fourth part of data is sent to the backlight controller in the next frame, and the data length of the fourth part of data is the preset length.

3. The control method according to claim 1, wherein: Sending local dimming data to the backlight controller specifically includes: If the data length of the control data of the current frame is the preset length, the control data of the current frame and the local dimming data of the current frame are sent to the backlight controller in sequence at the start time of the current frame; If the data length of the control data of the current frame is less than the preset length, the control data of the current frame and the local dimming data of the current frame are sent to the backlight controller in sequence after being delayed by a fourth preset delay time at the start time of the current frame.

4. The control method according to any one of claims 1 to 3, characterized in that: The backlight unit includes a plurality of backlight drivers, the plurality of backlight drivers are arranged at intervals along a first direction, and the plurality of backlight drivers are arranged at intervals along a second direction. The method further includes: Controlling the target driver to light up the corresponding backlight area upon receiving the local dimming data of the current frame, and controlling each intermediate driver to light up the corresponding backlight area after delaying for a second preset time after receiving the local dimming data of the current frame; The target driver is a backlight driver that receives the local dimming data of the current frame last, and the intermediate driver is a backlight driver other than the target driver. The first preset time is the difference between the time when the target driver sends the driving signal of the current frame to the backlight area and the time when the display panel receives the image data of the current frame; One intermediate driver corresponds to one second preset time, and the second preset time is the difference between the time when the intermediate driver receives the local dimming data of the current frame and the time when the target driver receives the local dimming data of the current frame.

5. The control method according to claim 4, characterized in that: The backlight drivers arranged along the second direction are referred to as a column of backlight drivers, the backlight unit comprises at least one backlight controller, the at least one backlight controller is connected to the plurality of columns of backlight drivers, and the at least one backlight controller is connected to a main controller; Each column of backlight drivers is provided with one target driver; The current column driver is any column backlight driver, the current driver is any intermediate driver in the current column driver, the current target driver is the target driver of the current column driver, and the second preset time corresponding to the current driver is determined based on the number of intervals and the transmission time for data transmission between two adjacent backlight drivers, and the number of intervals is the number of backlight drivers between the current driver and the current target driver.

6. The control method according to claim 4, characterized in that: The backlight drivers arranged along the second direction are referred to as a column of backlight drivers, the backlight unit includes a plurality of backlight controllers, the plurality of backlight controllers are cascade-connected, the backlight controllers at the first stage are connected to the main controller, and each of the backlight controllers is connected to at least one column of backlight drivers; The backlight drivers of each column connected to the last-stage backlight controller are called target column drivers, each column of the target column drivers is provided with a target driver, and the target driver is the last-stage backlight driver in each column of the target column drivers; If the current column driver is the target column driver, the current driver is any intermediate driver in the current column driver, and the current target driver is the target driver of the current column driver, the second preset time corresponding to the current driver is determined based on the number of intervals and the transmission time for data transmission between two adjacent backlight drivers, and the number of intervals is the number of backlight drivers between the current driver and the current target driver.

7. The control method according to claim 4, characterized in that: The backlight controllers except the last stage backlight controller are referred to as intermediate controllers, and the columns of backlight drivers connected to the intermediate controllers are referred to as intermediate column drivers. Each column of the intermediate column drivers is provided with a reference driver, and the reference driver is the last stage backlight driver in each column of the intermediate column drivers. If the current column driver is the intermediate column driver, the current driver is any intermediate driver in the current column driver except the reference driver, the second preset time corresponding to the current driver is determined according to a third preset time and a time adjustment value, the third preset time is determined according to a number of intervals and a transmission time for data transmission between two adjacent backlight drivers, the number of intervals being the number of backlight drivers between the current driver and the current reference driver, and the current reference driver being the reference driver of the current column driver; The time adjustment value is determined according to the data transmission time difference between the backlight controller corresponding to the current driver and the backlight controller at the last level.

8. The control method according to claim 4, characterized in that: The backlight controllers except the last stage backlight controller are referred to as intermediate controllers, and the columns of backlight drivers connected to the intermediate controllers are referred to as intermediate column drivers. Each column of the intermediate column drivers is provided with a reference driver, and the reference driver is the last stage backlight driver in each column of the intermediate column drivers. If the current column driver is the middle column driver, the current driver is the reference driver among the current column drivers, and the second preset time corresponding to the current driver is a time adjustment value; The time adjustment value is determined according to the data transmission time difference between the backlight controller corresponding to the current driver and the backlight controller at the last level.

9. A display device, characterized in that: The display device includes a main controller, a display panel and a backlight unit. The backlight unit includes a backlight controller, a backlight driver and a backlight area. The main controller is used to implement the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 8 when executed by a processor.

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