A method, device, terminal and medium for local dimming of liquid crystal display backlight

Abstract

The present invention discloses a method, device, terminal and medium for local dimming of the backlight of a liquid crystal display. The method comprises: receiving a target image, dividing the target image into a plurality of image areas, wherein the image areas correspond one-to-one to the backlight partitions of an LED screen; dividing each of the image areas into a plurality of sub-areas to obtain a target number of sub-areas; obtaining a brightness value corresponding to each of the sub-areas, and adjusting the backlight brightness of the image area based on the brightness value of the sub-area in each of the image areas and a target scanning method. The present invention provides a method for local dimming of the backlight of a liquid crystal display, which can achieve a local dimming effect of doubling the number of partitions without increasing the number of LED backlight blocks and the number of backlight partitions in the original module, and provide better image quality when displaying high-contrast images.

Description

Technical Field

[0001] The present invention relates to the field of wireless screen projection, and in particular to a method, device, terminal and medium for local dimming of a backlight of a liquid crystal display screen. Background Art

[0002] At present, in the high-end large-size display market, local dimming technology for screen backlight has been widely used. With the introduction of advanced technologies such as Mini LED, the number of local dimming partitions for screen backlight has increased significantly, based on which a more sophisticated local dimming effect has been achieved, and its contrast performance is close to that of OLED. However, while adding more LED backlight blocks and building more complex backlight control systems to support more partitions, not only does it increase hardware costs, it may also lead to an increase in overall production costs, thereby limiting the market competitiveness of the product. Therefore, there is an urgent need for a method to obtain a richer sense of picture layering without increasing the backlight blocks.

[0003] Therefore, the prior art still needs to be improved and enhanced. Summary of the invention

[0004] The present invention provides a method, device, terminal and medium for local dimming of the backlight of a liquid crystal display screen, aiming to solve the problem in the prior art that as the display requirements increase, the number of local dimming zones of the backlight also needs to increase accordingly, resulting in an increase in the overall production cost.

[0005] Receive a target image, and divide the target image into a plurality of image regions, wherein the image regions correspond one-to-one to backlight partitions of the LED screen;

[0006] Dividing each of the image regions into a plurality of sub-regions to obtain a target number of sub-regions;

[0007] A brightness value corresponding to each of the sub-regions is obtained, and the backlight brightness of the image region is adjusted based on the brightness value of the sub-region in each of the image regions and the target scanning mode.

[0008] In one implementation, it is characterized in that obtaining the brightness value corresponding to each of the sub-regions includes:

[0009] Obtaining the grayscale values ​​of all pixels in each of the sub-areas;

[0010] The brightness value of the sub-region is obtained based on the grayscale values ​​of all pixels in the sub-region.

[0011] In one implementation, the target scanning method includes:

[0012] Scanning the brightness values ​​of the sub-regions in each of the image regions frame by frame, or;

[0013] After each scanning frame is evenly divided into subframes having the same number as the subregions in each of the image regions, the brightness values ​​of the subregions in each of the image regions are scanned subframe by subframe.

[0014] In one implementation, it is characterized in that when each of the image regions is divided into two sub-regions, each of the image regions is divided into a first sub-region and a second sub-region.

[0015] In one implementation, it is characterized in that the adjusting the backlight brightness of the image area based on the brightness value of the sub-area in each of the image areas and the target scanning mode includes:

[0016] Acquire a brightness value corresponding to a first sub-region in a target image region as a first brightness value, and a brightness value corresponding to a second sub-region in the target image region as a second brightness value;

[0017] The backlight brightness of the target image area is adjusted based on the first brightness value and the second brightness value.

[0018] In one implementation, it is characterized in that the adjusting the backlight brightness of the target image area based on the first brightness value and the second brightness value includes:

[0019] Acquire a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value;

[0020] The backlight of the current display frame is displayed based on the first target brightness value and the second target brightness value.

[0021] In one implementation, it is characterized in that the acquiring a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value includes:

[0022] The first target brightness value is obtained based on a first target formula, where the first target formula is:

[0023]

[0024] in, is the first target brightness value, is the first brightness value, is the second brightness value, is the weight coefficient;

[0025] The second target brightness value is obtained based on the second target formula, where the second target formula is:

[0026]

[0027] in, is the second target brightness value.

[0028] In one implementation, displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes:

[0029] Displaying the first target brightness value as the backlight brightness value of the odd-numbered frames in the LED backlight partition display frame corresponding to the target image area;

[0030] The second target brightness value is displayed as the backlight brightness value of the LED backlight partition corresponding to the target image area in the even-numbered frames in the display frame.

[0031] In one implementation, displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes:

[0032] Displaying the first target brightness value as the backlight brightness value of the target image area in the first half frame of the current display frame;

[0033] The second target brightness value is displayed as the backlight brightness value of the target image area in the second half of the current display frame.

[0034] A second aspect of the present invention is a liquid crystal display backlight local dimming device, comprising:

[0035] A first division module is used to receive a target image and divide the target image into a plurality of image regions, wherein the image regions correspond one to one with backlight partitions of the LED screen;

[0036] A second division module is used to divide each of the image regions into a plurality of sub-regions to obtain a target number of sub-regions;

[0037] The brightness control module is used to obtain the brightness value corresponding to each of the sub-areas, and control the backlight brightness of the image area based on the brightness value of the sub-area in each of the image areas and the target scanning mode.

[0038] According to a third aspect of the present invention, a terminal is provided, wherein the terminal comprises: a memory, a processor, and a liquid crystal display backlight local dimming program stored in the memory and executable on the processor, wherein the liquid crystal display backlight local dimming program, when executed by the processor, implements the steps of the liquid crystal display backlight local dimming method as described above.

[0039] A fourth aspect of the present invention provides a storage medium, wherein the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps of the liquid crystal display backlight local dimming method described in any one of the above.

[0040] Beneficial effects: Compared with the prior art, the present invention provides a method, device, terminal and medium for local dimming of the backlight of a liquid crystal display screen. The method for local dimming of the backlight of a liquid crystal display screen provided by the present invention, when displaying an image, after receiving a target image, divides the target image into multiple image areas, the image areas correspond one-to-one to the backlight partitions of the LED screen, and then divides each of the image areas into multiple sub-areas to obtain a target number of sub-areas, and then obtains a brightness value corresponding to each of the sub-areas, and adjusts the backlight brightness of the image area based on the brightness value of the sub-area in each of the image areas and the target scanning mode. The present invention provides a method for local dimming of the backlight of a liquid crystal display screen for users, which solves the problem in the prior art that as the display requirements increase, the number of local dimming partitions of the backlight also needs to increase, resulting in an increase in the overall production cost, and provides a low-cost method for improving the dimming effect, which can achieve a local dimming effect of double the number of partitions without increasing the LED backlight block and the number of backlight partitions in the original module, and can provide better picture quality when displaying high-contrast images, and does not need to change the hardware design of the display module, which is convenient for rapid promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flow chart of an embodiment of a method for local dimming backlight of a liquid crystal display screen provided by the present invention;

[0042] Figure 2 A first division schematic diagram of an embodiment of a liquid crystal display backlight local dimming method provided by the present invention;

[0043] Figure 3 A second division schematic diagram of an embodiment of a liquid crystal display backlight local dimming method provided by the present invention;

[0044] Figure 4 A schematic diagram of a system framework in an embodiment of a method for local dimming of a backlight of a liquid crystal display provided by the present invention;

[0045] Figure 5 Schematic diagram of the sub-area division in the embodiment of the liquid crystal display backlight local dimming method provided by the present invention Figure 1 ;

[0046] Figure 6 Schematic diagram of the sub-area division in the embodiment of the liquid crystal display backlight local dimming method provided by the present invention Figure 2 ;

[0047] Figure 7 Schematic diagram of frame rate refresh in an embodiment of the liquid crystal display backlight local dimming method provided by the present invention Figure 1 ;

[0048] Figure 8 Schematic diagram of frame rate refresh in an embodiment of the liquid crystal display backlight local dimming method provided by the present invention Figure 2 ;

[0049] Fig. 9 A schematic diagram of functional modules of an embodiment of a liquid crystal display backlight local dimming device provided by the present invention;

[0050] Fig.10 A schematic diagram of an operating environment of an embodiment of a terminal provided by the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] Embodiment 1

[0053] The method for local dimming of the backlight of a liquid crystal display provided in this embodiment may be executed by a terminal, and the terminal may be, but is not limited to, a mobile phone, a computer, etc., and is described below using an intelligent computer as an example.

[0054] In the existing technology, in the high-end large-size display market, backlight local dimming technology has been widely used. With the introduction of advanced technologies such as Mini LED, the number of local dimming partitions of the screen backlight has increased significantly. Based on this, a more refined local dimming effect has been achieved, and its contrast performance is close to OLED. However, the increase in the number of partitions has also brought about an increase in costs, mainly due to the need to add more LED backlight blocks and build a more complex backlight control system to support more partitions. Therefore, while the current display manufacturers are pursuing image quality improvements, they are also working hard to balance the relationship between the number of partitions and costs, and generally control the number of backlight local dimming partitions of display products between a few hundred and a few thousand.

[0055] However, as display requirements increase, the number of backlight local dimming partitions also needs to increase accordingly. In view of this background, in this embodiment, an innovative display module local dimming (Local Dimming) image area division and backlight data extraction method is proposed. This method does not need to increase the number of LED backlight blocks or backlight partitions. It can achieve a local dimming effect with double the number of partitions on the basis of the original module by simply increasing the display refresh rate of the backlight data. For example, if the number of backlight partitions designed for the original module is 1000 zones, then by using the method of the present invention, a local dimming effect of nearly 2000 zones can be achieved on the module. This innovation not only optimizes the display effect, but also effectively controls the cost, providing a new idea for the development of display technology.

[0056] Specifically, in this embodiment, an innovative solution is proposed to more finely control the backlight partitioning, thereby significantly improving the display quality. This solution can effectively reduce the halo phenomenon when displaying high-contrast images (such as starry sky scenes), making the picture layering richer. It is worth noting that this improvement does not require any changes to the hardware design of the display module, which greatly promotes the rapid promotion and application of this technology. Through the solution provided by this embodiment, users will be able to enjoy a clearer and more delicate picture quality experience when watching high-contrast images.

[0057] Specifically, Figure 1 As shown, the liquid crystal display backlight local dimming method provided in this embodiment includes the steps of:

[0058] S100, receiving a target image, and dividing the target image into a plurality of image regions, wherein the image regions correspond one-to-one to backlight partitions of the LED screen.

[0059] Specifically, in this embodiment, the SoC (System on Chip) first receives display image signals from the front-end device through external interfaces such as HDMI (High Definition Multimedia Interface) or DP (DisplayPort). These signals contain image data to be displayed.

[0060] Then, the SoC transmits the received image signal to the image processing unit, which performs a series of processing operations on the input signal, such as color correction, image enhancement, resolution conversion, etc., to optimize the image quality.

[0061] The processed image signal is output to the LCD panel driver circuit through high-speed interfaces such as VbyOne or P2P (point-to-point). These interfaces ensure high-speed and stable transmission of image data and provide the necessary signal support for lighting the LCD panel.

[0062] When displaying the signal of the target image, the target image is first divided into regions corresponding to the size and number of the LED backlight partitions, such as Figure 2 shown.

[0063] Specifically, in this embodiment, dividing the target image into regions corresponding to the sizes and numbers of the LED backlight partitions comprises:

[0064] The signal of the target image is input to the local dimming algorithm implementation unit. This unit is the core of the local dimming technology and is responsible for dynamically adjusting the brightness of the LED backlight partition according to the image content.

[0065] In the local dimming algorithm implementation unit, the input image signal is first divided into a first number of image regions. The division of these image regions corresponds to the number of LED backlight partitions, that is, each image region corresponds to one or more LED backlight partitions, that is, the number of the image regions is equal to the number of the LED backlight partitions and corresponds to the LED backlight partitions one by one, for details, refer to Figure 2 This division ensures that the local dimming algorithm can perform precise brightness control for each image area.

[0066] Next, the local dimming algorithm implementation unit will calculate the corresponding LED backlight partition brightness values ​​according to the brightness, contrast and other parameters of each image area. These brightness values ​​will be used to drive the LED backlight partitions to achieve the local dimming effect.

[0067] S200: Divide each of the image regions into a plurality of sub-regions to obtain a target number of sub-regions.

[0068] Specifically, in this embodiment, in order to further improve the accuracy and image quality of local dimming, each of the image areas is further divided.

[0069] Specifically, the interior of each initially divided image area is further subdivided into a plurality of sub-areas. In a specific implementation, each image area can be divided into 2 or more sub-areas. The more sub-areas there are, the better the image quality of the target image displayed on the same display device will be.

[0070] For example, each image region is subdivided into sub-region A and sub-region B (or other number of sub-regions, depending on the requirement of the subdivision degree). Thus, assuming that the LED backlight is divided into M*N sub-regions, each of the initially divided image regions is subdivided into two sub-regions, that is, when each of the image regions is divided into 2 sub-regions, the total number of image regions finally obtained will become M*N*2, as shown in FIG. Figure 3 shown.

[0071] Specifically, in this embodiment, the example of dividing each of the image regions into two sub-regions is used for description. When each of the image regions is divided into two sub-regions, each of the image regions is divided into a first sub-region and a second sub-region.

[0072] In this way, by adding a solution to further subdivide each image area, a larger number of image areas (such as M*N*2) can be obtained, thereby achieving more precise control of the brightness of the LED backlight partitions. This not only improves the accuracy of local dimming, but also helps to reduce the halo phenomenon, enhance the layering of the picture, and provide users with a more delicate and clear picture quality experience. At the same time, this method does not require major changes to the hardware, so it has high feasibility and market promotion value.

[0073] Specifically, refer to Figure 4 , Figure 4 From the main block diagram of the display technology solution provided in this embodiment, it can be seen that, in this embodiment, in addition to local dimming of the target image, a double partitioning algorithm implementation unit is additionally added, that is, on the basis of dividing the target image into image areas of a number equal to the number of LED backlight partitions based on LED backlight partitions, each image area is further subdivided into a number of sub-areas.

[0074] It can be seen that in this embodiment, an innovative local dimming technology for the display module is proposed, focusing on the division of image areas and the extraction method of backlight data. Specifically, in this embodiment, the input image is first finely divided to obtain multiple image areas. For example, in a device with a display image resolution of 3840*2160, LED backlight partitions of M=16, and N=9, the number of local dimming partitions is set to 16*9, for a total of 144 backlight partitions. At this time, when a 3840*2160 resolution image is received, the image is divided into M*N areas, where M=16, N=9, for a total of 144 areas, and each image area corresponds one-to-one to a backlight partition.

[0075] On this basis, in this embodiment, each image region is further subdivided internally into a plurality of sub-regions. For example, each image region is further subdivided into two sub-regions 1-A and 1-B, image region 2 is subdivided into two sub-regions 2-A and 2-B, and so on, until image region 144 is subdivided into two sub-regions 144-A and 144-B.

[0076] The input image is divided according to the backlight partition to obtain multiple image areas (for example, Figure 2 and attached Figure 3In the image area 1 to 144), each image area corresponds to a backlight partition one by one, and the size of each image area is 240*240 (3840÷16=240, 2160÷9=240) pixels.

[0077] Specifically, when each image area is further divided internally, each image area is further divided into a plurality of sub-areas according to product requirements and program presets. Assuming that in an application example, each image area is divided into two sub-areas, the division method includes but is not limited to the following: Figure 5 The area A and the area B shown, wherein the area A is the first sub-area, the area B is the second sub-area, and the size of each sub-area is 120*240 pixels; or Figure 6 In the shown area A and area B, each sub-area has a size of 240*120 pixels.

[0078] In addition, in addition to the example Figure 5 and Figure 6 These two sub-region division methods also include dividing the image region into other shapes such as circle / trapezoid / triangle, etc.

[0079] It can be seen that in this embodiment, each of the image areas is divided into two sub-areas as the basis for the explanation of the next steps. However, in more embodiments, each of the image areas can be divided into no less than two sub-areas. The more sub-areas are divided, the higher the refresh rate when displaying the image, and the clearer the image looks. But at the same time, the more sub-areas are divided, it also means higher technical requirements and it is more difficult to achieve.

[0080] S300, obtaining a brightness value corresponding to each of the sub-regions, and adjusting the backlight brightness of the image region based on the brightness value of each sub-region in the image region and a target scanning mode.

[0081] The target scanning method includes:

[0082] Scanning the brightness values ​​of the sub-regions in each of the image regions frame by frame, or;

[0083] After each scanning frame is evenly divided into subframes having the same number as the subregions in each of the image regions, the brightness values ​​of the subregions in each of the image regions are scanned subframe by subframe.

[0084] The obtaining of the brightness value corresponding to each of the sub-regions includes:

[0085] S310, obtaining the grayscale values ​​of all pixels in each of the sub-areas;

[0086] S320: Obtain a brightness value of the sub-region based on the grayscale values ​​of all pixels in the sub-region.

[0087] Specifically, the local dimming algorithm implementation unit counts the pixel content in a single image area and obtains the grayscale values ​​of all pixels in each of the sub-areas. The specific method includes:

[0088] The pixel maximum value method is used to obtain the maximum pixel value in each backlight partition.

[0089] The pixel average method is used to calculate the average value of all pixels in each backlight zone.

[0090] A convolutional neural network method is used, which includes a convolution layer, a pooling layer, a fully connected layer, etc., to process the feature values ​​of all pixels in each backlight partition, so as to obtain the backlight value of each backlight partition.

[0091] Through the above method, the grayscale value of each backlight subarea pixel can be obtained, and then the brightness value to be displayed in the subarea is obtained based on the grayscale value, totaling M*N*2 brightness values.

[0092] The step of adjusting the backlight brightness of the image area based on the brightness value of the sub-area in each image area and the target scanning mode includes:

[0093] S330, acquiring a brightness value corresponding to a first sub-region in a target image region as a first brightness value, and a brightness value corresponding to a second sub-region in the target image region as a second brightness value;

[0094] S340: Adjust the backlight brightness of the target image area based on the first brightness value and the second brightness value.

[0095] The adjusting the backlight brightness of the target image area based on the first brightness value and the second brightness value includes:

[0096] Acquire a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value;

[0097] The backlight of the current display frame is displayed based on the first target brightness value and the second target brightness value.

[0098] The acquiring a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value includes:

[0099] The first target brightness value is obtained based on a first target formula, where the first target formula is:

[0100]

[0101] in, is the first target brightness value, is the first brightness value, is the second brightness value, is the weight coefficient;

[0102] The second target brightness value is obtained based on the second target formula, where the second target formula is:

[0103]

[0104] in, is the second target brightness value.

[0105] In this embodiment, in order to further improve the local dimming effect, a double partition algorithm implementation unit is introduced.

[0106] Specifically, after obtaining the brightness value of each sub-area of ​​the target image, the backlight signal, including M*N*2 brightness values, is output through an interface such as SPI or LVDS, and sent to the double partition algorithm implementation unit, and the double partition algorithm implementation unit extracts M*N first brightness values ​​from the M*N*2 brightness values. , these M*N first brightness values One-to-one correspondence with the number of LED backlight partitions (M*N partitions), for example, refer to Figure 5 , which can be the A area defined in each of the image areas; at the same time, the double partition algorithm implementation unit will also extract M*N second brightness values ​​from M*N*2 brightness values , these M*N second brightness values One-to-one correspondence with the number of LED backlight partitions (M*N partitions), for example, refer to Figure 5 , which may be a B area defined in each of the image areas. Then, a first target brightness value is obtained based on the first brightness value and the second brightness value. and the second target brightness value .

[0107] Specifically, the local dimming algorithm implementation unit counts several sub-areas within a single image area, such as Figure 5 The pixel contents of area A and area B shown in the figure are used to obtain the brightness value to be displayed in each sub-area. For example, the brightness value to be displayed in sub-area A is , the brightness value to be displayed in sub-area B is , and sent to the double partition algorithm implementation unit. The double partition algorithm implementation unit receives all brightness values ​​of the A sub-area within each image area. And all brightness values ​​of sub-area B , and then according to and The first target brightness value of a single image area is extracted by multiplying it with the weight coefficient r and adding them together. and the second target brightness value .

[0108] These include:

[0109] The first target brightness value is obtained based on a first target formula, where the first target formula is:

[0110]

[0111] in, is the first target brightness value, is the first brightness value, is the second brightness value, is the weight coefficient;

[0112] The second target brightness value is obtained based on the second target formula, where the second target formula is:

[0113]

[0114] in, is the second target brightness value.

[0115] In practical applications, when r is in the range of (0.5, 1), it represents the brightness value of the first target. The brightness value to be displayed by sub-area A is mainly the first brightness value. Impact; The second target brightness value The brightness value to be displayed by the B sub-area is the second brightness value. Similarly, when r is in the range of (0, 0.5), it represents the brightness value of the first target. The brightness value to be displayed by the B sub-area is the second brightness value. Impact; The second target brightness value The brightness value to be displayed by sub-area A is mainly the first brightness value. Similarly, when r is equal to 0.5, the first target brightness value is equal to the second target brightness value, that is, .

[0116] The method of displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes:

[0117] Displaying the first target brightness value as the backlight brightness value of the odd-numbered frames in the LED backlight partition display frame corresponding to the target image area;

[0118] The second target brightness value is displayed as the backlight brightness value of the LED backlight partition corresponding to the target image area in the even-numbered frames in the display frame.

[0119] The method of displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes:

[0120] Displaying the first target brightness value as the backlight brightness value of the target image area in the first half frame of the current display frame;

[0121] The second target brightness value is displayed as the backlight brightness value of the target image area in the second half of the current display frame.

[0122] Specifically, the double partition algorithm implementation unit will divide each image area and The brightness value is sent to the LED backlight driver unit. The LED backlight driver unit scans and displays in the order of odd and even frames, for example, odd frames are scanned and displayed. Brightness value, even frame scan display Brightness value.

[0123] During the odd-numbered frame time of the backlight display, the double partition algorithm implementation unit sets the first target brightness value The backlight signal (MxN brightness values) is output through an interface such as SPI or LVDS and sent to the LED backlight driver unit; during the even frame time of the backlight display, the double partition algorithm implementation unit converts the second target brightness value The backlight signal (M*N brightness values) is output through an interface such as SPI or LVDS and sent to the LED backlight driving unit.

[0124] Specifically, for each image region and The brightness value is sent by the LED backlight driver unit to the corresponding backlight partition of the LED backlight, and is scanned and displayed in the order of odd and even frames. For example, the odd-numbered frames of the backlight display are scanned and displayed. Brightness value, even frame scan display of backlight display Brightness value. Supports the mode where the panel display image refresh rate is the same as the LED backlight display brightness refresh rate, such as Figure 7 As shown. The panel display image refresh rate is k frames (120Hz), and the LED backlight display brightness refresh rate is also k frames (120Hz). Figure 7middle (n, 1), where n in the brackets (n, 1) indicates the nth frame, and 1 in the brackets indicates backlight partition 1. In addition, it also supports modes where the panel display image refresh rate is different from the LED backlight display brightness refresh rate, such as Figure 8 As shown. For the convenience of further explanation, the refresh rate of the panel display image is k frames (120Hz), and the LED backlight display brightness refresh rate is 2*k frames (240Hz). That is to say, the first target brightness value is displayed as the backlight brightness value of the target image area in the first half of the current display frame; the second target brightness value is displayed as the backlight brightness value of the target image area in the second half of the current display frame. In more embodiments, the display method can also be more diversified, which will not be elaborated here.

[0125] Based on this, it is possible to achieve a local dimming effect with double the number of partitions on the basis of the original module. For example, when each of the image areas is divided into 2 sub-areas, when the module design backlight partition has only 144 zones, it is possible to achieve a local dimming effect of 288 zones on this module, thereby significantly improving the display effect and user experience.

[0126] It can be seen that the method for local dimming of the backlight of the liquid crystal display proposed in this embodiment only needs to increase the display refresh rate of the backlight data, and can achieve a local dimming effect with double the number of partitions (for example, the number of backlight partitions designed for the original module is 1000, and the present invention can achieve a local dimming effect of nearly 2000 partitions on the module) in the case of the original module (without increasing the LED backlight block and the number of backlight partitions). At the same time, the method for local dimming of the backlight of the liquid crystal display proposed in this embodiment can also be applied to display products with hundreds to thousands of backlight local dimming partitions in the current market. The backlight partitions can be controlled more finely, and the halo phenomenon of high-contrast images (such as starry sky images) can be effectively reduced to obtain a richer sense of picture layering, thereby providing better picture quality when displaying high-contrast images and achieving a local dimming effect with double the number of partitions.

[0127] In summary, the present embodiment provides a method for local dimming of the backlight of a liquid crystal display screen. When displaying an image, after receiving a target image, the target image is divided into a plurality of image areas, and the image areas correspond one-to-one to the backlight partitions of the LED screen. Then, each of the image areas is divided into a plurality of sub-areas to obtain a target number of sub-areas. Then, a brightness value corresponding to each of the sub-areas is obtained, and the backlight brightness of the image area is regulated based on the brightness value of the sub-area in each of the image areas and the target scanning method. The present embodiment provides a method for local dimming of the backlight of a liquid crystal display screen for users, which solves the problem in the prior art that as the display requirements increase, the number of local dimming partitions of the backlight also needs to increase, resulting in an increase in the overall production cost. It provides a low-cost method for improving the dimming effect, which can achieve a local dimming effect of double the number of partitions without adding LED backlight blocks and the number of backlight partitions to the original module, and can provide better image quality when displaying high-contrast images. It does not need to change the hardware design of the display module, which is convenient for rapid promotion.

[0128] It should be understood that, although the various steps in the flowcharts given in the accompanying drawings of the present invention are displayed in sequence according to the indications of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of the steps in the present invention is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps of the present invention may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0129] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by signaling related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0130] Embodiment 2

[0131] Based on the above embodiments, the present invention further provides a liquid crystal display backlight local dimming device, the functional module diagram of which is shown in FIG. Fig. 9 As shown, the liquid crystal display backlight local dimming device includes:

[0132] A first division module is used to receive a target image and divide the target image into a plurality of image regions, wherein the image regions correspond to backlight partitions of the LED screen one by one, as described in the first embodiment;

[0133] A second division module is used to divide each of the image regions into a plurality of sub-regions to obtain a target number of sub-region screens, as described in the first embodiment;

[0134] The brightness control module is used to obtain the brightness value corresponding to each of the sub-areas, and to control the backlight brightness of the image area based on the brightness value of each sub-area in the image area and the target scanning mode, as described in the first embodiment.

[0135] Embodiment 3

[0136] like Fig.10 As shown, based on the above-mentioned liquid crystal display backlight local dimming method, the present invention also provides a terminal accordingly, and the terminal includes a processor 10, a memory 20 and a display 30. Fig.10 Only some components of the terminal are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0137] In some embodiments, the memory 20 may be an internal storage unit of the terminal, such as a hard disk or memory of the terminal. In other embodiments, the memory 20 may also be an external storage device of the terminal, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. equipped on the terminal. Further, the memory 20 may also include both an internal storage unit of the terminal and an external storage device. The memory 20 is used to store application software and various types of data installed on the terminal, such as the program code of the installation terminal. The memory 20 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a liquid crystal display backlight local dimming program 40 is stored on the memory 20, and the liquid crystal display backlight local dimming program 40 can be executed by the processor 10, thereby realizing the liquid crystal display backlight local dimming method in the present application.

[0138] In some embodiments, the processor 10 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run the program code or process data stored in the memory 20, such as executing the liquid crystal display backlight local dimming method.

[0139] In some embodiments, the display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 30 is used to display information on the terminal and to display a visual user interface. The components 10-30 of the terminal communicate with each other via a system bus.

[0140] In one embodiment, when the processor 10 executes the LCD display backlight local dimming program 40 in the memory 20, the following steps are implemented:

[0141] Receive a target image, and divide the target image into a plurality of image regions, wherein the image regions correspond one to one with backlight partitions of the LED screen;

[0142] Dividing each of the image regions into a plurality of sub-regions to obtain a target number of sub-regions;

[0143] A brightness value corresponding to each of the sub-regions is obtained, and the backlight brightness of the image region is adjusted based on the brightness value of the sub-region in each of the image regions and the target scanning mode.

[0144] The obtaining of the brightness value corresponding to each of the sub-regions includes:

[0145] Obtaining the grayscale values ​​of all pixels in each of the sub-areas;

[0146] The brightness value of the sub-region is obtained based on the grayscale values ​​of all pixels in the sub-region.

[0147] Wherein, the target scanning method includes:

[0148] Scanning the brightness values ​​of the sub-regions in each of the image regions frame by frame, or;

[0149] After each scanning frame is evenly divided into subframes having the same number as the subregions in each of the image regions, the brightness values ​​of the subregions in each of the image regions are scanned subframe by subframe.

[0150] When each of the image regions is divided into two sub-regions, each of the image regions is divided into a first sub-region and a second sub-region.

[0151] Wherein, the adjusting the backlight brightness of the image area based on the brightness value of each sub-area in the image area and the target scanning mode includes:

[0152] Acquire a brightness value corresponding to a first sub-region in a target image region as a first brightness value, and a brightness value corresponding to a second sub-region in the target image region as a second brightness value;

[0153] The backlight brightness of the target image area is adjusted based on the first brightness value and the second brightness value.

[0154] Wherein, adjusting the backlight brightness of the target image area based on the first brightness value and the second brightness value includes:

[0155] Acquire a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value;

[0156] The backlight of the current display frame is displayed based on the first target brightness value and the second target brightness value.

[0157] The acquiring of a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value includes:

[0158] The first target brightness value is obtained based on a first target formula, where the first target formula is:

[0159]

[0160] in, is the first target brightness value, is the first brightness value, is the second brightness value, is the weight coefficient;

[0161] The second target brightness value is obtained based on the second target formula, where the second target formula is:

[0162]

[0163] in, is the second target brightness value.

[0164] The step of displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes:

[0165] Displaying the first target brightness value as the backlight brightness value of the odd-numbered frames in the LED backlight partition display frame corresponding to the target image area;

[0166] The second target brightness value is displayed as the backlight brightness value of the LED backlight partition corresponding to the target image area in the even-numbered frames in the display frame.

[0167] The step of displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes:

[0168] Displaying the first target brightness value as the backlight brightness value of the target image area in the first half frame of the current display frame;

[0169] The second target brightness value is displayed as the backlight brightness value of the target image area in the second half of the current display frame.

[0170] Embodiment 4

[0171] The present invention also provides a storage medium storing one or more programs, which can be executed by one or more processors to implement the steps of the liquid crystal display backlight local dimming method described in the above embodiment.

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for local dimming of a liquid crystal display backlight, characterized in that: include: Receive a target image, and divide the target image into a plurality of image regions, wherein the image regions correspond one-to-one to backlight partitions of the LED screen; Dividing each of the image regions into a plurality of sub-regions to obtain a target number of sub-regions; Acquire a brightness value corresponding to each of the sub-regions, and adjust the backlight brightness of the image region based on the brightness value of the sub-region in each of the image regions and a target scanning mode; When each of the image regions is divided into two sub-regions, each of the image regions is divided into a first sub-region and a second sub-region; The step of adjusting the backlight brightness of the image area based on the brightness value of the sub-area in each image area and the target scanning mode includes: Acquire a brightness value corresponding to a first sub-region in a target image region as a first brightness value, and a brightness value corresponding to a second sub-region in the target image region as a second brightness value; Acquire a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value; Displaying a backlight of a current display frame based on the first target brightness value and the second target brightness value; The acquiring a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value includes: The first target brightness value is obtained based on a first target formula, where the first target formula is: in, is the first target brightness value, is the first brightness value, is the second brightness value, is the weight coefficient; The second target brightness value is obtained based on the second target formula, where the second target formula is: in, is the second target brightness value.

2. The method for local dimming of a liquid crystal display backlight according to claim 1, characterized in that: The obtaining of the brightness value corresponding to each of the sub-regions includes: Obtaining the grayscale values ​​of all pixels in each of the sub-areas; The brightness value of the sub-region is obtained based on the grayscale values ​​of all pixels in the sub-region.

3. The method for local dimming of a liquid crystal display backlight according to claim 1, characterized in that: The target scanning method includes: Scanning the brightness values ​​of the sub-regions in each of the image regions frame by frame, or; After each scanning frame is evenly divided into subframes having the same number as the subregions in each of the image regions, the brightness values ​​of the subregions in each of the image regions are scanned subframe by subframe.

4. The method for local dimming of a liquid crystal display backlight according to claim 1, characterized in that: The method of displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes: Displaying the first target brightness value as the backlight brightness value of the odd-numbered frames in the LED backlight partition display frame corresponding to the target image area; The second target brightness value is displayed as the backlight brightness value of the LED backlight partition corresponding to the target image area in the even-numbered frames in the display frame.

5. The method for local dimming of a liquid crystal display backlight according to claim 1, characterized in that: The method of displaying the backlight of the current display frame based on the first target brightness value and the second target brightness value includes: Displaying the first target brightness value as the backlight brightness value of the target image area in the first half frame of the current display frame; The second target brightness value is displayed as the backlight brightness value of the target image area in the second half of the current display frame.

6. A liquid crystal display backlight local dimming device, characterized in that: The device comprises: A first division module is used to receive a target image and divide the target image into a plurality of image regions, wherein the image regions correspond one to one with backlight partitions of the LED screen; A second division module is used to divide each of the image regions into a plurality of sub-regions to obtain a target number of sub-regions; A brightness control module, used to obtain a brightness value corresponding to each of the sub-regions, and to control the backlight brightness of the image region based on the brightness value of the sub-region in each of the image regions and a target scanning mode; When each of the image regions is divided into two sub-regions, each of the image regions is divided into a first sub-region and a second sub-region; The step of adjusting the backlight brightness of the image area based on the brightness value of the sub-area in each image area and the target scanning mode includes: Acquire a brightness value corresponding to a first sub-region in a target image region as a first brightness value, and a brightness value corresponding to a second sub-region in the target image region as a second brightness value; Acquire a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value; Displaying a backlight of a current display frame based on the first target brightness value and the second target brightness value; The acquiring a first target brightness value and a second target brightness value based on the first brightness value and the second brightness value includes: The first target brightness value is obtained based on a first target formula, where the first target formula is: in, is the first target brightness value, is the first brightness value, is the second brightness value, is the weight coefficient; The second target brightness value is obtained based on the second target formula, where the second target formula is: in, is the second target brightness value.

7. A terminal, characterized in that: The terminal includes: a memory, a processor, and a liquid crystal display backlight local dimming program stored in the memory and executable on the processor, wherein the liquid crystal display backlight local dimming program, when executed by the processor, implements the steps of the liquid crystal display backlight local dimming method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps of the liquid crystal display backlight local dimming method as described in any one of claims 1-5.

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