Backlight driving method, backlight driving device and display equipment
By identifying target areas in a liquid crystal display device where the brightness difference exceeds a threshold, and controlling the light-emitting units within its dimming zone to emit light at a brightness between the minimum and maximum brightness, the halo problem is solved, resulting in better display effects and brightness adaptation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-23
- Publication Date
- 2026-03-10
AI Technical Summary
When displaying images with alternating bright and dark areas, existing LCD displays cannot simultaneously meet the brightness requirements of both brighter and darker pixels within the dimming zone, resulting in a halo effect and affecting the display quality.
By acquiring display data, the target area with a brightness difference greater than a threshold is identified, and the dimming zone light-emitting unit in that area is controlled to emit light at a first brightness between the minimum and maximum brightness. At the same time, the brightness of the light-emitting units in other areas is adjusted to eliminate halos and improve the display effect.
It effectively eliminates halo effects, improves the display effect and brightness adaptation capability of display devices, and avoids image quality degradation.
Smart Images
Figure CN121640925A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology, and more particularly to a backlight driving method, a backlight driving device, and a display equipment. Background Technology
[0002] A liquid crystal display device includes a display screen, light-emitting units for emitting backlight, and a backlight control system. The backlight control system includes a backlight controller and a backlight driver. Each backlight driver is connected to multiple light-emitting units, and the light-emitting units connected to each backlight driver constitute a dimming zone. When multiple dimming zones are formed, local dimming can be achieved, thereby improving the display effect of the display device.
[0003] However, when displaying other images with alternating light and dark elements, such as starry skies or white text on a black background, such as Figure 1 As shown, white in the display represents higher brightness and black represents lower brightness. There may be a problem that the brightness data difference between adjacent pixels in one or more dimming zones is large. However, within a dimming zone, the needs of either brighter or darker pixels must be met. It is impossible to meet the needs of both brighter and darker pixels at the same time. This results in the brightness within the dimming zone not being accurately matched, thus producing a halo effect and reducing the display effect. Summary of the Invention
[0004] This invention provides a backlight driving method, a backlight driving device, and a display device to reduce halos and improve display effects.
[0005] In a first aspect, embodiments of the present invention provide a backlight driving method, comprising: acquiring display data of the current frame; determining a target area from the display data, wherein the brightness data difference between adjacent pixels in the target area is greater than or equal to a first threshold, and the target area corresponds to at least one dimming zone in a backlight panel; and controlling the light-emitting units in each dimming zone corresponding to the target area to emit light at a first brightness, wherein the first brightness is greater than the minimum brightness of each pixel in the target area and less than the maximum brightness of each pixel in the target area.
[0006] Optionally, the backlight driving method further includes: controlling the light-emitting units in the dimming zone corresponding to the area outside the target area within the display area to emit light based on local dimming data.
[0007] Optionally, the backlight driving method further includes controlling the light-emitting units in each dimming zone corresponding to the area outside the target area within the display area to emit light at a first brightness.
[0008] Optionally, the first brightness is determined using the following formula: B1 = a × B avg +(1-a)×B max ; Where B1 represents the first brightness, Bavg B represents the average brightness of all pixels in the displayed data. max This represents the maximum brightness among the brightness levels of each dimming zone corresponding to the displayed data. 'a' represents the halo risk coefficient, with a value greater than 0 and less than 1.
[0009] Optionally, the halo risk factor is determined based on the brightness contrast of the target area, which is the ratio of the brightness of the first pixel in the target area to the brightness of the adjacent pixels. The first pixel is the pixel with the maximum brightness in the target area, and the brightness of the first pixel is greater than the brightness of the adjacent pixels.
[0010] Optionally, the backlight driving method further includes: before controlling the light-emitting units in each dimming zone corresponding to the target area to emit light at a first brightness, determining the halo risk level of the target area based on the brightness contrast of the target area; determining that the halo risk level of the target area is greater than or equal to a second threshold; wherein, the brightness contrast of the target area is: the ratio of the brightness of the first pixel in the target area to the brightness of the adjacent pixels, the first pixel is the pixel with the maximum brightness in the target area, and the brightness of the first pixel is greater than the brightness of the adjacent pixels.
[0011] Optionally, the halo risk level of the target area is determined based on the brightness contrast of the target area, including: finding the halo risk level corresponding to the brightness contrast of the target area from a mapping table of brightness contrast and halo risk level.
[0012] Optionally, determining that the halo risk level of the target area is greater than or equal to the second threshold includes: when there are multiple target areas, determining the comprehensive halo risk level of each target area; the comprehensive halo risk level is greater than or equal to the second threshold; wherein the comprehensive halo risk level is any one of the following: the average halo risk level of each target area, the maximum value of the halo risk level of each target area, and the minimum value of the halo risk level of each target area.
[0013] Optionally, the target area is the display area corresponding to the first dimming zone, and the first dimming zone is the dimming zone corresponding to two pixels in at least one dimming zone whose brightness data difference is greater than or equal to a first threshold.
[0014] Secondly, embodiments of the present invention also provide a backlight driving device, comprising: a memory for storing program instructions; and a processor for calling the program instructions stored in the memory and executing the backlight driving method as described in the first aspect above according to the obtained program.
[0015] Thirdly, embodiments of the present invention also provide a display device, including: a backlight panel and a backlight driving device as described in the second aspect above, wherein the backlight driving device is connected to the backlight panel.
[0016] The beneficial effects of this invention are as follows: The present invention provides a backlight driving method, a backlight driving device, and a display device. The target area is an area where the brightness data difference is greater than or equal to a first threshold. Therefore, the display screen in the target area is prone to halos. By controlling the light-emitting units in each dimming zone corresponding to the target area to emit light at a first brightness, and the first brightness is neither the minimum brightness nor the maximum brightness, it is possible to avoid halos when the light-emitting units in each dimming zone corresponding to the target area emit light based on the maximum brightness, and also to avoid image quality degradation when the light-emitting units in each dimming zone corresponding to the target area emit light based on the minimum brightness. Thus, the display effect can be improved while eliminating halos. Attached Figure Description
[0017] Figure 1 The image displayed on a screen provided in the prior art; Figure 2 This is a flowchart of a backlight driving method provided in an embodiment of the present invention; Figure 3 This is a flowchart of one embodiment of the backlight driving method provided in this invention; Figure 4 This is a schematic diagram of the backlight driving device provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation
[0018] The specific embodiments of a backlight driving method, backlight driving device, and display device provided by the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0019] This invention provides a backlight driving method, such as... Figure 2 As shown, the backlight driving method includes: S201. Obtain the display data of the current frame; S202. Determine the target area from the display data, wherein the difference in brightness data between adjacent pixels in the target area is greater than or equal to a first threshold, and the target area corresponds to at least one dimming area in the backlight panel. S203. Control the light-emitting units in each dimming zone corresponding to the target area to emit light at a first brightness, the first brightness being greater than the minimum brightness of each pixel in the target area and less than the maximum brightness of each pixel in the target area.
[0020] Thus, the target area is the region where the brightness data difference is greater than or equal to the first threshold. Therefore, the display screen in the target area is prone to halos. By controlling the light-emitting units in each dimming zone corresponding to the target area to emit light at the first brightness, and the first brightness is neither the minimum brightness nor the maximum brightness, it is possible to avoid halos when the light-emitting units in each dimming zone corresponding to the target area emit light based on the maximum brightness, and also to avoid image quality degradation when the light-emitting units in each dimming zone corresponding to the target area emit light based on the minimum brightness. This can improve the display effect while eliminating halos.
[0021] The display data includes, but is not limited to: brightness data, RGB signal data, RGB chromaticity data, etc.; when each pixel includes red sub-pixels, green sub-pixels and blue sub-pixels, R corresponds to red sub-pixels, G corresponds to green sub-pixels and B corresponds to blue sub-pixels.
[0022] The target area may include multiple pixels, and there is a brightness data difference between any two adjacent pixels, resulting in multiple brightness data differences. When the brightness data is represented using gray levels 0-255, some of these brightness data differences may be 0 gray level, while others may be greater than 0 gray level, such as, but not limited to, 10 gray level, 50 gray level, 200 gray level, 255 gray level, etc., which will not be listed here. Therefore, in S202 above, as long as any one of the brightness data differences corresponding to the target area is greater than or equal to the first threshold, the requirement that the brightness data difference between adjacent pixels in the target area is greater than or equal to the first threshold is met. Therefore, within a target area, there may be one, two, or more pairs of pixels that satisfy the requirement that the brightness data difference is greater than or equal to the first threshold; this is not limited here.
[0023] Alternatively, the scope of the target area can be determined in the following ways: The display area corresponding to the first dimming zone of two pixels whose brightness data difference is greater than or equal to the first threshold is the target area; that is, the target area is the display area corresponding to the first dimming zone, and the first dimming zone is the dimming zone corresponding to two pixels whose brightness data difference is greater than or equal to the first threshold in at least one dimming zone.
[0024] Alternatively, taking two pixels whose brightness data difference is greater than or equal to a first threshold as the center, the lines connecting pixels in each direction at a first distance from the center constitute the boundary of the target area. The first distance can be, but is not limited to, 1 / 2, 1 / 4, 1 / 8 of the shortest side length of the display area, etc., which will not be listed here.
[0025] Alternatively, if two pixels with a brightness difference greater than or equal to the first threshold are considered as a target pixel group, then the proportion of the target pixel group within the target area is greater than a set value. The set value can be, but is not limited to, 30%, 40%, 50%, 60%, 70%, etc., which will not be listed here. Among them, the line connecting the outermost target pixel group can constitute the boundary of the target area, or the line formed by extending the line connecting the outermost target pixel group outward by a second distance can constitute the boundary of the target area. The second distance can be, but is not limited to, 1 / 10, 1 / 50, 1 / 100 of the shortest side length of the display area, etc., which will not be listed here.
[0026] Optionally, the backlight driving method further includes: controlling the light-emitting units in the dimming zones corresponding to areas outside the target area within the display area to emit light based on local dimming data. That is, the display area includes a target area and non-target areas, with the non-target area being the area outside the target area. The light-emitting units in the dimming zones corresponding to the target area emit light at a first brightness to eliminate halos, while the light-emitting units in the dimming zones corresponding to the non-target areas emit light according to the local dimming data of the corresponding dimming zones to improve display contrast. This allows for the elimination of halos without sacrificing display contrast, thereby improving the display effect.
[0027] Alternatively, the backlight driving method may also include controlling the light-emitting units in each dimming zone corresponding to the area outside the target area of the display area to emit light at a first brightness. That is, regardless of whether it is the target area or a non-target area, the light-emitting units in each dimming zone emit light at the first brightness, which can reduce the complexity of the backlight driving and eliminate halo.
[0028] Optionally, the first brightness can be a brightness pre-configured based on experience. Alternatively, the first brightness can be determined using the following formula: B1 = a × B avg +(1-a)×B max ; Where B1 represents the first brightness, B avg B represents the average brightness of all pixels in the displayed data. max This represents the maximum brightness among the brightness levels of each dimming zone corresponding to the displayed data. 'a' represents the halo risk coefficient, with a value greater than 0 and less than 1.
[0029] Therefore, the first brightness is related to both the average brightness of each pixel and the maximum brightness of each dimming zone. This balances the brightness requirements of the image, maintains the sense of depth, and satisfies the comfort of the display, while also suppressing highlight overflow and reducing halos. This achieves a balance between the brightness requirements of the image and the elimination of halos, thereby improving the display effect.
[0030] The halo risk factor, 'a', is determined based on the brightness contrast of the target area. The brightness contrast of the target area is the ratio of the brightness of the first pixel to the brightness of its adjacent pixels. The first pixel is the pixel with the highest brightness in the target area, and its brightness is greater than that of its adjacent pixels. Since a pixel adjacent to the first pixel may also be the first pixel, the brightness contrast refers to the ratio of the brightness of the first pixel to that of its adjacent, dimmer pixel.
[0031] In this way, a first mapping table between the halo risk coefficient and the brightness contrast can be pre-configured, and the halo risk coefficient corresponding to the brightness contrast can be found from the first mapping table, so that the determined halo risk coefficient is more in line with the actual display situation and reduces the adverse effects on the display effect.
[0032] Optionally, the backlight driving method further includes: before controlling the light-emitting units in each dimming zone corresponding to the target area to emit light at a first brightness, determining the halo risk level of the target area based on the brightness contrast of the target area; and determining that the halo risk level of the target area is greater than or equal to a second threshold.
[0033] In other words, in this invention, S203 can be executed immediately after S202, which reduces the number of backlight driving steps, lowers complexity, improves backlight driving efficiency, and reduces power consumption.
[0034] Alternatively, after performing S202 and before S203, additional steps can be added, such as determining the halo risk level, comparing the halo risk level with the second threshold, and then performing S203. This allows areas with lower halo risk levels to be eliminated from the identified target areas. Since the dimming areas corresponding to target areas with lower halo risk levels are less likely to produce halos even if they emit light based on local dimming data, but emitting light based on the first brightness might reduce display contrast and image quality, the dimming areas corresponding to target areas with lower halo risk levels can still emit light based on local dimming data, while the dimming areas corresponding to target areas with higher halo risk levels can emit light based on the first brightness. This minimizes the impact on display contrast and display effect while eliminating halos. Therefore, comparing the halo risk level with the second threshold can be used to filter out target areas with higher halo risk levels, and then controlling the dimming areas corresponding to the filtered target areas to emit light based on the first brightness eliminates halos.
[0035] Specifically, determining the halo risk level of the target area based on its brightness contrast includes: finding the halo risk level corresponding to the brightness contrast of the target area from a mapping table of brightness contrast and halo risk levels (i.e., the second mapping table). The first and second mapping tables can be different mapping tables, or different parts of a larger mapping table; this is not restricted here.
[0036] Determining that the halo risk level of a target area is greater than or equal to a second threshold includes: when there are multiple target areas, determining the comprehensive halo risk level of each target area; the comprehensive halo risk level being greater than or equal to the second threshold; wherein the comprehensive halo risk level is any one of the following: the average halo risk level of each target area, the maximum halo risk level of each target area, or the minimum halo risk level of each target area. In this way, when there are multiple target areas, the actual situation of each target area can be comprehensively considered to achieve the goal of halo elimination.
[0037] Of course, if there is only one target area, we can directly compare whether the halo risk level of this target area is greater than or equal to the second threshold.
[0038] The process of the backlight driving method is described below with reference to specific implementation.
[0039] As shown in Figure 3, the backlight driving method includes the following steps: S301, Obtain the display data of the current frame; S302. Determine the target area from the displayed data; S303. From the mapping table of brightness contrast and halo risk level, find the halo risk level corresponding to the brightness contrast of the target area; S304. When there are multiple target areas, determine the comprehensive halo risk level of each target area; S305. Determine whether the overall halo risk level is greater than or equal to the second threshold; if yes, proceed to S306; if no, proceed to S307. S306. Execute the global control strategy or the hybrid control strategy; S307, Implement local control strategies.
[0040] The global control strategy involves controlling all light-emitting units in each dimming zone to emit light at a first brightness. The hybrid control strategy includes: controlling all light-emitting units in each dimming zone corresponding to the target area to emit light at a first brightness, and controlling the light-emitting units in each dimming zone corresponding to areas outside the target area within the display area to emit light based on corresponding local dimming data. The local control strategy involves controlling the light-emitting units in each dimming zone to emit light based on corresponding local dimming data.
[0041] certainly, Figure 3 The described embodiment is merely one of the embodiments described above, and is only used here as an example. Figure 3 The example shown is merely for illustration.
[0042] Based on the same inventive concept, this embodiment of the invention also provides a backlight driving device. The implementation principle of the backlight driving device is similar to that of the backlight driving method described in the foregoing embodiments. The implementation method and technical effects of the backlight driving device can be found in the implementation methods and technical effects of the foregoing backlight driving method. Repeated descriptions will not be repeated.
[0043] Specifically, embodiments of the present invention also provide a backlight driving device, such as... Figure 4 As shown, it includes: Memory 401 is used to store program instructions; The processor 402 is used to call the program instructions stored in the memory 401 and execute the backlight driving method described above according to the obtained program.
[0044] Optionally, the backlight driver may be, but is not limited to, a chip integrated into the display driver, such as, but not limited to, a neural processing unit (NPU) or other integrated artificial intelligence (AI) acceleration chip, which is not limited here.
[0045] Optionally, the processor 402 may be equipped with a deep learning model, as described above. Figure 3 Taking the embodiment described in the text as an example, after the display data of the current frame is input into the deep learning model, the deep learning model will execute the process from S302 to S305, and then output the strategy mentioned in S306 and S307. After that, the light-emitting unit in the dimming area will be driven to emit light based on the output strategy.
[0046] Optionally, the deep learning model includes: 1. Model Training Phase. Specifically, an image dataset containing halo phenomena is collected, and high-risk halo areas are manually labeled; a multi-task learning framework is used to jointly optimize the tasks of light intensity distribution prediction and control mode classification, with the loss function being weighted cross-entropy + mean squared error; quantization compression is performed when deploying the model to ensure real-time operation on embedded devices.
[0047] 2. Data Preprocessing. Specifically, the first step is data collection, obtaining raw data from public datasets such as, but not limited to, ImageNet, business data, or crawled data, ensuring that the data covers diverse scenarios (such as different lighting, angles, noise, etc.). Then, data cleaning is performed, removing invalid samples (such as damaged images and empty text), handling missing values (filling or deleting), and correcting annotation errors (manual review or semi-automatic correction). ImageNet is a large visualization database used for research on visual object recognition software.
[0048] 3. Standardize and enhance the processed data. Specifically, normalize numerical data (e.g., scale to [0,1] or use z-score standardization), and standardize image data to a uniform size (e.g., 224×224) and normalize it (e.g., divide by 255). Generate new samples through random transformations to improve generalization, and enhance image data by adding noise and adjusting brightness / contrast. Here, z-score, also called the standard score, is the difference between a number and the mean divided by the standard deviation.
[0049] 4. Finally, complete the data partitioning and loading. First, the dataset needs to be partitioned proportionally into a training set (60-80%), a validation set (10-20%), and a test set (10-20%), ensuring a consistent distribution (e.g., stratified sampling). Then, load the data using DataLoader (PyTorch) or tf.data (TensorFlow) to build a data pipeline, supporting parallel loading, prefetching, and batch processing. DataLoader is the data loader; PyTorch is an open-source deep learning framework, and DataLoader is the core interface for data loading in PyTorch. tf.data is the dataset; TensorFlow is an open-source machine learning framework that supports multi-platform deployment and provides a complete toolchain.
[0050] 5. Real-time control stage. Input the display data of the current frame into the model, and output the control strategy after the model processes it.
[0051] It should be understood that the above 1 to 5 describe the relevant processing procedures involved in the deep learning model when processing the display data output control strategy. However, in practice, the processing procedures of the deep learning model are not limited to the contents described in the above 1 to 5, and can also be other variations, which are not limited here.
[0052] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 5 As shown, it includes: a backlight panel and a backlight driving device as described above, the backlight driving device being connected to the backlight panel.
[0053] Continue as Figure 5 As shown, the display device also includes: a display screen, a backlight controller, and a display driver. The backlight driver may be located in the display driver, which may also include a display driver in addition to the backlight driver. The display driver is connected to the display screen, the backlight driver is connected to the backlight controller, and the backlight controller is connected to the backlight panel. The backlight driver is used to: output a backlight control strategy, such as a global control strategy, a hybrid control strategy, or a local control strategy, to the backlight controller; the backlight controller drives the light-emitting units in the backlight panel to emit light based on the received backlight control strategy; and the display driver is used to output a display signal to the display screen.
[0054] When the backlight driver is a chip integrated into the display driver, and the processor of the backlight driver is equipped with a deep learning model, a lightweight deep learning model can be run in real time. The backlight panel supports the switching of dynamic backlight control strategies, and the response latency is less than 10ms.
[0055] Of course, the backlight driver can be integrated into the backlight controller (not shown in the figure). This allows the backlight controller to determine the backlight control strategy and achieves integrated design of the backlight controller's functions.
[0056] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A backlight driving method, characterized by, The method comprises: acquiring display data of a current frame; determining a target region from the display data, the target region having a difference in luminance data between adjacent pixels greater than or equal to a first threshold value, the target region corresponding to at least one dimming zone in a backlight panel; controlling light emitting units in each of the dimming zones corresponding to the target region to emit light at a first luminance, the first luminance being greater than a minimum value of luminance of the pixels in the target region and less than a maximum value of luminance of the pixels in the target region.
2. The backlight driving method of claim 1, wherein, The backlight driving method further comprises: based on local dimming data, controlling the light emitting units in the dimming zones corresponding to regions other than the target region in a display region to emit light.
3. The backlight driving method of claim 1, wherein, The backlight driving method further comprises: controlling the light emitting units in each of the dimming zones corresponding to regions other than the target region in a display region to emit light at the first luminance.
4. The backlight driving method of claim 1, wherein, The first luminance is determined using the following formula: B1 = a x B avg + (1 - a) x B max ; wherein B1 represents the first luminance, B avg represents the average luminance of the luminance of each of the pixels in the display data, B max represents the maximum luminance in the luminance of each of the dimming regions corresponding to the display data, and a represents a halo risk coefficient, the value of a being greater than 0 and less than 1.
5. The backlight driving method of claim 4, wherein, The halo risk coefficient is determined according to a luminance contrast ratio of the target region, the luminance contrast ratio of the target region being a ratio of a luminance of a first pixel in the target region to a luminance of an adjacent pixel, the first pixel being the pixel in the target region having the maximum luminance, the luminance of the first pixel being greater than the luminance of the adjacent pixel.
6. The backlight driving method of claim 1, wherein, The backlight driving method further comprises: before controlling the light emitting units in each of the dimming zones corresponding to the target region to emit light at the first luminance, determining a halo risk level of the target region according to the luminance contrast ratio of the target region; and when it is determined that the halo risk level of the target region is greater than or equal to a second threshold value, controlling the light emitting units in each of the dimming zones corresponding to the target region to emit light at the first luminance. The luminance contrast ratio of the target region is a ratio of a luminance of a first pixel in the target region to a luminance of an adjacent pixel, the first pixel being the pixel in the target region having the maximum luminance, the luminance of the first pixel being greater than the luminance of the adjacent pixel.
7. The backlight driving method of claim 6, wherein, Determining that the halo risk level of the target region is greater than or equal to the second threshold value comprises: When the target region has multiple target regions, determining a comprehensive halo risk level of the target regions; the comprehensive halo risk level being greater than or equal to the second threshold value; wherein the comprehensive halo risk level is any one of: an average of the halo risk levels of the target regions, a maximum of the halo risk levels of the target regions, and a minimum of the halo risk levels of the target regions.
8. The backlight driving method according to any one of claims 1 to 7, wherein The target region is a display region corresponding to a first dimming zone, the first dimming zone being a dimming zone corresponding to two pixels in the at least one dimming zone having a difference in luminance data greater than or equal to the first threshold value.
9. A backlight driving apparatus, characterized by comprising: The apparatus comprises: a memory for storing program instructions; a processor for invoking the program instructions stored in the memory to perform the backlight driving method according to any one of claims 1-8.
10. A display device, characterized by comprising: The apparatus comprises: a backlight panel, and a backlight driving device according to claim 9, the backlight driving device being connected to the backlight panel.