CN115657368B - Display equipment area backlight adjusting method - Google Patents
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Abstract
The invention discloses a method for adjusting regional backlight of display equipment, and belongs to the field of display adjustment. Firstly, dividing a backlight module into a plurality of backlight partitions; secondly, calculating an initial backlight value of each backlight partition according to the gray information of the pixel points in each backlight partition; then, correcting the initial backlight value of each backlight partition, and enhancing the dark area of the backlight partition; and finally, carrying out filtering treatment on the backlight value enhanced by the dark area of each backlight partition. The method of the present invention can properly reduce the brightness of the backlight when a darker picture is displayed, and can turn off the backlight even when a completely black picture is displayed, so as to significantly reduce power consumption. The regional dimming technology of the invention makes the bright region bright and the dark region dark in the picture; the brightness can be finely adjusted, and the contrast is improved, so that the picture quality is greatly improved.
Description
Technical Field
The invention relates to the technical field of display adjustment, in particular to a method for adjusting regional backlight of display equipment.
Background
In recent years, as the requirements of consumers for picture quality are higher and higher, the LCD display needs to be technically improved, and especially, as the HDR display specification is strongly focused on the market, the requirement of achieving high contrast picture quality is of course high. In order to enhance contrast for LCD display applications, it is critical to use local dimming techniques.
The backlight module of the liquid crystal display is a main source of system energy consumption. In general, a liquid crystal display operates with a backlight output at a constant power, which results in the backlight always being bright. When a darker picture is displayed, the brightness of the darker picture is too high due to the problem of full lighting of the backlight and light leakage of the liquid crystal, which makes the contrast ratio of the liquid crystal display lower and the power consumption larger. The local dimming technique can effectively improve this phenomenon, thereby significantly reducing power consumption.
Disclosure of Invention
The invention aims to provide a method for adjusting backlight of a display device area, which aims to solve the problems in the background technology.
In order to solve the technical problem, the present invention provides a method for adjusting backlight of a display device area, including:
dividing the backlight module into a plurality of backlight partitions;
calculating an initial backlight value of each backlight partition according to the pixel point gray information in each backlight partition;
correcting the initial backlight value of each backlight partition, and enhancing the dark area of the backlight partition;
and performing filtering processing on the backlight value after the enhancement of each backlight subarea dark area.
In one embodiment, the calculation formula of the initial backlight value is as follows:
wherein L is init (n) is the initial luminance of the nth backlight partition, P NUM Is the number of pixels of the nth backlight partition, G (k) is the gray value of the kth pixel point in the backlight partition, L max To set the maximum backlight value, T int Is a parameter, L max And T int Can be adjusted according to the actual display effect.
In one embodiment, when the average initial backlight value of the entire backlight module is lower than a preset threshold value, correcting the initial backlight value of each backlight partition; after correction, the backlight partitions with initial backlight values higher than the average initial backlight value of the whole backlight module are enhanced to a backlight value L enh ance Thereby achieving dark area enhancement.
In one embodiment, the correction is performed using the following formula:
if L init <L average Or L average >T th The backlight value of the backlight partition remains unchanged, i.e.:
L enh ance ＝L init
otherwise the first set of parameters is selected,
L enh ance ＝min(L max ,L init +T enh *(L init -L average ))
wherein L is enh ance For the backlight value, L, of the backlight partition enhanced by the dark region average An average initial backlight value T of the whole backlight module th To define the threshold of dark areas, T enh The magnitude of the enhancement for dark areas; l (L) max And T enh Can be adjusted according to the actual display effect, T th Through experimental tests, a good correction effect is obtained when the value is 18.
In one embodiment, filtering the backlight value after the enhancement of the dark area of each backlight partition includes the following steps:
selecting a neighborhood with a specific length or shape around a point as a window template;
selecting a filtering model for filtering the backlight value after the dark area is enhanced;
backlight value G for partitioning backlight of shadow part based on filtering template sh adow And (5) performing calculation of filtering processing.
In one embodiment, a Gaussian filter template with a size of 3×3 neighborhood is used to partition the backlight value G for the shadow portion based on the Gaussian filter template sh adow Calculation of Gaussian filter processing:
G sh adow ＝(100*1+50*2+200*1+30*2+60*4+90*2+60*1+60*2+60*1)/16＝70
i.e. the shadow portion backlight partition backlight value G sh adow From the original 60, it becomes 70 after gaussian filtering.
The method for adjusting the backlight of the display equipment area has the following beneficial effects:
(1) When a darker picture is displayed, the brightness of the backlight can be properly reduced, and even when a full black picture is displayed, the backlight can be turned off, so that the power consumption can be remarkably reduced;
(2) The area dimming technology makes the bright area bright and the dark area dark in the picture; compared with the prior art that the brightness of the picture can only be adjusted in the whole area, the area dimming technology can finely adjust the brightness and improve the contrast, thereby greatly improving the picture quality.
Drawings
FIG. 1 is a schematic diagram of a local backlight adjustment method.
Fig. 2 is a flow chart of a method for adjusting backlight of a display device area according to the present invention.
FIG. 3 is a schematic diagram of backlight partitioning.
Fig. 4 is a schematic diagram of a gaussian filter template.
Fig. 5 is a schematic diagram of a gaussian filter process.
Detailed Description
The invention provides a method for adjusting backlight of a display device area, which is further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
As shown in fig. 1, when the medium and small-sized LCD displays work, most of the LCD displays adopt a timing control chip to receive data of a video source, and the data is transmitted by the timing control chip in two paths: the first path is a display panel path, the time sequence control logic is transmitted to the LCD driving chip to control the LCD panel, the second path is a backlight module path, and the data which passes through the time sequence control chip is transmitted to the MiniLED driving chip to control the MiniLED lamp panel after being optimized by the regional dimming algorithm.
The whole area backlight adjusting method is shown in fig. 2, and comprises the following steps:
step 1: as shown in fig. 3, the backlight module is divided into a plurality of backlight partitions;
step 2: according to the gray information of the pixel points in each backlight subarea, calculating an initial backlight value of each backlight subarea, wherein the calculation formula of the initial backlight value is as follows:
wherein L is init (n) is the initial luminance of the nth backlight partition, P NUM Is the number of pixels of the nth backlight partition, G (k) is the gray value of the kth pixel point in the backlight partition, L max To set the maximum backlight value, T int Is a parameter. L (L) max And T int Can be adjusted according to the actual display effect.
Step 3: when the average initial backlight value of the whole backlight module is lower than a preset threshold value, the initial backlight value of each backlight partition is corrected. After correction, the backlight partitions with initial backlight values higher than the average initial backlight value of the whole backlight module can be properly enhanced to the backlight value L enh ance Thereby realizing the enhancement of dark areas and achieving the effect of improving the contrast ratio of the image.
The correction is performed using the following formula:
if L init <L average Or L average >T th The backlight value of the backlight partition remains unchanged, i.e.:
L enhance ＝L init
otherwise the first set of parameters is selected,
L enhance ＝min(L max ,L init +T enh *(L init -L average ))
wherein L is enhance For the backlight value, L, of the backlight partition enhanced by the dark region average An average initial backlight value T of the whole backlight module th To define the threshold of dark areas, T enh The magnitude of the enhancement for the dark areas. L (L) max And T enh Can be adjusted according to the actual display effect, T th Through experimental tests, a better correction effect can be obtained when the value is 18.
Step 4: and performing filtering processing on the backlight value after the enhancement of each backlight subarea dark area.
Various noise is introduced to different extents during the generation, acquisition and processing of the images. Therefore, image quality is deteriorated, and recognition of the target is affected. Therefore, the image must be spatially filtered, and the backlight partition backlight value is optimized to adjust the backlight brightness, so as to achieve the effect of smooth display of the display screen.
In digital image processing, many algorithms are template-based, with the template using a window, which may be a neighborhood of a particular length or shape around a point, for computing the output of the algorithm. Sliding windows of odd size are typically selected. Different sizes of 3×3, 5×5, or 7×7 may be selected as desired. If a sliding window with a larger size is selected, more logic resources are occupied, so that the working frequency is reduced, and the image processing effect is not necessarily improved obviously.
After selecting the template, a filtering model for filtering the backlight value after the dark area is enhanced is required to be selected. Gaussian filtering is a linear smoothing filter that selects weights according to the shape of the gaussian function, which is effective in removing noise that is subject to normal distribution. In summary, the invention adopts a gaussian filtering template with a 3×3 neighborhood, and a schematic diagram of the template is shown in fig. 4.
As shown in fig. 5, the backlight value G is partitioned for the shadow portion backlight based on the gaussian filter template sh adow The calculation method for Gaussian filter processing comprises the following steps:
G sh adow ＝(100*1+50*2+200*1+30*2+60*4+90*2+60*1+60*2+60*1)/16＝70；
i.e. the shadow portion backlight partition backlight value G sh adow From the original 60, it becomes 70 after gaussian filtering. After the backlight value is processed by using the filtering model, the backlight brightness of the partition with larger difference value with the adjacent partition in the backlight partition can be obviously improved, so that the backlight value of the partition is optimized to be closer to the backlight value of the neighborhood of the partition, and the effect of smooth display of the whole picture is realized.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (3)
1. A method for adjusting backlight of a display device area, comprising:
dividing the backlight module into a plurality of backlight partitions;
calculating an initial backlight value of each backlight partition according to the pixel point gray information in each backlight partition;
correcting the initial backlight value of each backlight partition, and enhancing the dark area of the backlight partition;
performing filtering treatment on the backlight value enhanced by each backlight partition dark area;
the calculation formula of the initial backlight value is as follows:
wherein L is init (n) is the initial luminance of the nth backlight partition, P NUM Is the number of pixels of the nth backlight partition, G (k) is the gray value of the kth pixel point in the backlight partition, L max To set the maximum backlight value, T int Is a parameter, L max And T int The adjustment can be performed according to the actual display effect;
when the average initial backlight value of the whole backlight module is lower than a preset threshold value, correcting the initial backlight value of each backlight partition; after correction, the backlight partitions with initial backlight values higher than the average initial backlight value of the whole backlight module are enhanced to a backlight value L enhance Thereby achieving dark area enhancement;
the correction is performed using the following formula:
if L init <L average Or L average >T th The backlight value of the backlight partition remains unchanged, i.e.:
L enhance ＝L init
otherwise the first set of parameters is selected,
L enhance ＝min(L max ,L init +T enh *(L init -L average ))
wherein L is enhance For the backlight value, L, of the backlight partition enhanced by the dark region average An average initial backlight value T of the whole backlight module th To define the threshold of dark areas, T enh The magnitude of the enhancement for dark areas; l (L) max And T enh Can be adjusted according to the actual display effect, T th Through experimental tests, a good correction effect is obtained when the value is 18.
2. The method for adjusting backlight of a display device area according to claim 1, wherein filtering the backlight value after the enhancement of the dark area of each backlight partition comprises the steps of:
selecting a neighborhood with a specific length or shape around a point as a window template;
selecting a filtering model for filtering the backlight value after the dark area is enhanced;
backlight value G for partitioning backlight of shadow part based on filtering template shadow And (5) performing calculation of filtering processing.
3. The method for adjusting backlight of display device area according to claim 2, wherein a gaussian filter template having a size of 3 x 3 neighborhood is used, and the backlight of the shadow portion is partitioned into backlight values G based on the gaussian filter template shadow Calculation of Gaussian filter processing:
G shadow ＝(100*1+50*2+200*1+30*2+60*4+90*2+60*1+60*2+60*1)/16＝70
i.e. the shadow portion backlight partition backlight value G shadow From the original 60, it becomes 70 after gaussian filtering.
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| TWI649600B (en) * | 2018-01-12 | 2019-02-01 | 友達光電股份有限公司 | Signal processing method and display device |
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| JP2007012043A (en) * | 2005-06-28 | 2007-01-18 | Lg Philips Lcd Co Ltd | Median filtering method and device |
| CN106531088A (en) * | 2016-12-06 | 2017-03-22 | 东南大学 | Control method for optimizing dynamic backlight of local area of liquid crystal display equipment |
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