CN113362777B - Dimming method and display device - Google Patents
Dimming method and display device Download PDFInfo
- Publication number
- CN113362777B CN113362777B CN202110757722.1A CN202110757722A CN113362777B CN 113362777 B CN113362777 B CN 113362777B CN 202110757722 A CN202110757722 A CN 202110757722A CN 113362777 B CN113362777 B CN 113362777B
- Authority
- CN
- China
- Prior art keywords
- matrix
- original image
- frequency part
- backlight
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 26
- 238000005192 partition Methods 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims description 204
- 238000009792 diffusion process Methods 0.000 claims description 53
- 238000001914 filtration Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009499 grossing Methods 0.000 description 4
- 238000010606 normalization Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a dimming method and a display device, and belongs to the technical field of liquid crystal display. The dimming method comprises the following steps: inputting an image A, separating the image A into an original image high-frequency part A G and an original image low-frequency part A D, and dividing the original image high-frequency part A G and the original image low-frequency part A D into corresponding small blocks according to set partitions; two paths of operations are carried out on pixel values in small blocks, one path of operation is used for determining image details through a high-frequency part A G of an original image, the image is divided into three parts of high details, medium details and low details, the backlight value of each small block is determined according to different detail division backlight control methods, the other path of operation is used for carrying out pixel compensation on a low-frequency part A D of the original image, and finally, the high frequency and the low frequency are combined to form an output pixel value so as to display the image; improving image quality and reducing power consumption. The display device based on the dimming method comprises a liquid crystal display module and a backlight module; the backlight module comprises a backlight source and the like, and the improvement is that: the backlight source is miniLED lamp panel or microLED lamp panel; the spacing between adjacent LED lamps is in millimeter level.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, relates to processing of backlight sources, adopts small-spacing LED lamps to realize millimeter-level light control, and particularly relates to a partition control method of a display device based on millimeter-level light control.
Background
With years of development of displays, conventional display devices have failed to meet the display requirements of modern high-speed development, and display of a pair of high-quality and low-power-consumption images has been pursued by the display industry. The existing display device consists of a backlight module and a display panel, wherein the backlight module adopts an LCD lamp panel, compared with the current mainstream display products, the traditional LCD liquid crystal display device has the defects of higher power consumption, lower contrast ratio and the like, and mainly comprises that when the traditional display device displays images, the backlight always displays based on constant brightness, so that the backlight can not be turned off when the display device displays a pair of low-brightness images or full-dark images. The liquid crystal has the characteristics, so that the light leakage phenomenon exists, the image power consumption is high, the contrast ratio is low, and the quality of the display picture is poor. In order to overcome the difficulty, the design of a double-layer screen is developed, and a display screen is added on the basis of the display of a layer of display screen under the condition that a backlight module is unchanged.
Disclosure of Invention
In order to solve the problem of low contrast ratio in the traditional liquid crystal display device, the invention provides a dimming method and a display device based on the dimming method.
A display device based on the dimming method comprises a liquid crystal display module 1 and a backlight module 2; the backlight module 2 includes a diffusion film 201, an incremental film 202, a quantum film 203, a backlight 204, and a reflective film 205, and the dimming operation is as follows:
Inputting an image A, separating a high-frequency part from a low-frequency part, wherein the high-frequency part of the original image is A G, the low-frequency part of the original image is A D, the high-frequency part A G of the original image is a place with a severe change of an image gray value, namely an edge area of the image, and the low-frequency part A D of the original image is a slow change area of the image gray value, namely a so-called gentle area; dividing the original image high-frequency part A G and the original image low-frequency part A D into corresponding small blocks according to the set partitions; and carrying out two paths of operations on pixel values in the small blocks, wherein one path of operation is used for determining image details through a high-frequency part A G of an original image, dividing the image into three parts of high details, medium details and low details, determining the backlight value of each small block according to different detail division backlight control methods, and carrying out pixel compensation on a low-frequency part A D of the original image, and finally combining the high frequency with the low frequency to form an output pixel value for displaying the image.
The specific operation steps of the dimming method are as follows:
Step (1), inputting an image, wherein the resolution of the original image is MXN, dividing the original image into an original image high-frequency part A G and an original image low-frequency part A D through Gaussian filtering, wherein each pixel point in the original image A, the original image high-frequency part A G and the original image low-frequency part A D is composed of R, G, B sub-pixels, and converting the original image A, the original image high-frequency part A G and the original image low-frequency part A D into a gray matrix I, a gray matrix I G and a gray matrix I D respectively;
Dividing a gray matrix I obtained by the original image in the step (1), a gray matrix I G obtained by an original image high-frequency part A G and a gray matrix I D obtained by an original image low-frequency part A D into corresponding small blocks according to R multiplied by S, wherein the number of pixels in each small block is (M/R) multiplied by (N/S), obtaining pixel values corresponding to the small blocks, and calculating the maximum value, the minimum value and the average value in each small block; wherein R is the row of the corresponding small block of the original image division, S is the column of the corresponding small block of the original image division,/is the divisor, R < M, S < N, M is the row of the original image, N is the column of the original image;
Step (3), dividing the gray matrix I G of the high-frequency part A G of the original image obtained in the step (2) to obtain small blocks B i,j, I, j which represent the position coordinate values of the small blocks B i,j; the average value inside the small block B i,j is calculated, and the obtained value of the small block B i,j is divided into three parts, namely a high detail part, a middle detail part and a low detail part; determining the backlight value of an image by using a gray matrix I of an original image A in a region corresponding to a high detail part, a middle detail part and a low detail part, wherein the high detail part selects the maximum value of a sub-pixel in the region as the backlight value, the middle detail part adopts an error correction control method to determine the backlight value, the low detail part selects the sub-pixel value in the region for normalization, and the square root obtained is multiplied by 255 to serve as the backlight value, so that a R1 multiplied by S1 backlight value matrix is obtained, wherein R1 = R and S1 = S;
step (4), the backlight value matrix R1×S1 obtained in the step (3) is subjected to fuzzy diffusion to finally become a fuzzy diffusion matrix of MxN; the diffusion method is a sliding window method, a window template is selected, the diffusion window template is (2t+1) x (2t+1), t > =1, t is a positive integer, and a specific value in the diffusion template is required to be determined through an actual light diffusion measurement value;
Step (5), compensating the pixel value of the gray matrix I D of the original image low-frequency part A D obtained in the step (1) by the compensation factor obtained in the operation of the step (4), and obtaining a matrix I DP of the original image low-frequency part A D after compensation; and then processing the gray matrix I G of the high-frequency part A G of the original image, performing linear stretching to obtain a matrix I GP; of the high-frequency part A G of the original image, merging the matrix I GP obtained by linear stretching of the high-frequency part A G of the original image and the matrix I DP obtained by pixel compensation of the low-frequency part A D, determining the finally output pixel value, and sending the finally output pixel value to a display device based on millimeter-level light control for displaying the image.
The specific technical scheme is as follows:
In the step (1), the original image high-frequency portion a G and the original image low-frequency portion a D are obtained by gaussian filtering, where a gaussian formula is:
In the above formula, G is the output, x 2+y2 is the square of the gaussian blur radius, σ is the standard deviation of the normal distribution, and e is a natural constant.
In the step (4), the concrete operation of the sliding window method is as follows:
(1.1) extending the backlight matrix R1×S1 in one row up and down and extending the backlight matrix R1×S1 in one column left and right, respectively, to change the backlight matrix R1×S1 into a matrix of (R1+2) × (S1+2);
(1.2) for the matrix (R1+2) x (S1+2), sliding the diffusion template from the first pixel value, and traversing the entire matrix by the template to obtain an R2 x S2 matrix;
(1.3) linearly expanding the R2×S2 matrix by one time to obtain a R3×S3 matrix, performing row expansion on the outermost periphery of the R3×S3 matrix, and performing column expansion on the left and right sides of the outermost periphery of the matrix, wherein R3×S3 is changed into a matrix of (R3+2) × (S3+2);
(1.4) sliding the diffusion template from the first pixel value for the (r3+2) x (s3+2) matrix, and then traversing the entire matrix by the template to obtain an r4×s4 matrix;
and (1.5) repeating the R4 multiplied by S4 matrix for F times according to the steps (1.3) - (1.4), linearly expanding the matrix into an M multiplied by N matrix, and determining the compensation factors of each point through the pixel value corresponding to each point in the M multiplied by N matrix;
wherein r=r1=r2, r2=2×r3=2×r4, s=s1=s2, s2=2×s3=2×s4, and F is a positive integer of 1 to 5.
In the step (5), the liquid crystal compensation algorithm of the low-frequency part A D of the original image is a linear or nonlinear compensation algorithm. The gray matrix I G obtained by the high-frequency part A G of the original image is multiplied by a coefficient k, and the coefficient can be modified by judging the image characteristics to obtain a matrix I GP; and (3) adding corresponding matrix internal values of a matrix I GP obtained by linear stretching of the high-frequency part A G of the original image and a matrix I DP obtained by pixel compensation of the low-frequency part A D of the original image to obtain a final output pixel value I Z, and sending the final output pixel value I Z to a liquid crystal control module for displaying images.
The display device based on the dimming method comprises a liquid crystal display module 1 and a backlight module 2; the backlight module 2 includes a diffusion film 201, an incremental film 202, a quantum film 203, a backlight 204 and a reflective film 205, and the improvement is that:
The backlight 204 is miniLED or microLED; the spacing between adjacent LED lamps is in millimeter level.
The beneficial technical effects of the invention are as follows:
1. according to the invention, by adopting the LED lamp with small space, and adding the combined action of the quantum film, the brightness enhancement film and the diffusion plate, the same backlight data is input, and the front-screen brightness is 743cd/m 2 and 824cd/m 2 respectively. The invention improves the brightness of the backlight and the light mixing effect, and the millimeter-level light control display device adopts the partition light control, and each small LED lamp can be independently controlled.
2. The size of the output light of the backlight module is determined by dividing the input image so as to display the output image, the millimeter-level light mixing effect is good, the whole image is displayed in a gap between two subareas and is transited naturally, and the phenomenon of 'blocking' is avoided.
3. The dimming method of the invention adjusts parameters by carrying out two paths of processing on pixels, and has the beneficial effects on the image: when an image is input, compared with an output image obtained by a traditional method, the subjective human eye observation can see that the detail of the image display is enhanced, the contrast is objectively improved to a certain extent by measurement, the power consumption is reduced to a certain extent, and the specific parameter improving effect of the embodiment 3 is seen.
Drawings
FIG. 1 is a side elevational view of the structure of the present invention;
FIG. 2 is a schematic view of a backlight panel structure according to the present invention;
FIG. 3 is a schematic diagram of a backlight and LCD panel structure;
Fig. 4 is a flowchart of a dynamic dimming partition control method provided in embodiment 1;
serial numbers in fig. 1-4: the liquid crystal display panel 1, the backlight module 2, the diffusion film 201, the incremental film 202, the quantum film 203, the backlight 204, and the reflection film 205.
Detailed Description
The invention provides a millimeter-level light control display device and a partition control method. In order to make the design more clear and concise, the present inventions are further described in the following description in conjunction with the accompanying drawings and detailed description.
Example 1
Referring to fig. 1, a display device based on millimeter-level light control includes a liquid crystal display screen and a backlight module, the liquid crystal display screen includes a liquid crystal display panel 1; the backlight module 2 comprises a diffusion film 201, an incremental film 202, a quantum film 203, a backlight 204 and a reflecting film 205, wherein the backlight 204 is a miniLED lamp panel, and the distance between adjacent LED lamps is in millimeter level.
Referring to fig. 4, a specific operation procedure of a dimming method is as follows:
Step (1): an image is input, the resolution of the original image is 1920×1080, the original image is divided into an original image high-frequency part A G and an original image low-frequency part A D through Gaussian filtering, each pixel point in the original image A, the original image high-frequency part A G and the original image low-frequency part A D is composed of R, G, B three sub-pixels, and the original image A, the original image high-frequency part A G and the original image low-frequency part A D are respectively converted into a gray matrix I, a gray matrix I G and a gray matrix I D.
The original image high-frequency part A G and the original image low-frequency part A D are obtained through Gaussian filtering, and the Gaussian formula is as follows:
In the above formula, G is the output, x 2+y2 is the square of the gaussian blur radius, σ is the standard deviation of the normal distribution, and e is a natural constant.
In this embodiment 1, the radius of the gaussian filter is selected to 15, the standard deviation of the normal distribution is selected to 2.5, the original image is subjected to the gaussian filter to obtain the original image low frequency portion a D, and then the original image a is subtracted from the original image low frequency portion a D to obtain the original image high frequency portion a G.
And (2) dividing the gray matrix I obtained in the step (1), the gray matrix I G obtained in the high-frequency part A G and the gray matrix I D obtained in the low-frequency part A D into 576 small areas of 32×18 (R×S), wherein the backlight areas are shown in fig. 2. The number of pixels in each small block area is 60×60 ((M/R) × (N/S)), and the corresponding relationship is shown in fig. 3 for 3600 pixels in each small block area. Obtaining pixel values corresponding to the small block areas, and calculating the maximum value, the minimum value and the average value in the small block areas; wherein r=32 is a row of the original image division corresponding small block, and s=18 is a column of the original image division corresponding small block; in the formula (M/R) x (N/S), wherein/is the divisor, R < M, S < N, M is the row of the original image, and N is the column of the original image;
Step (3), dividing the gray matrix I G of the high-frequency part A G of the original image obtained in the step (2) to obtain small blocks B i,j, I, j which represent the position coordinate values of the small blocks B i,j; the average value inside the small block B i,j is calculated, and the obtained value of the small block B i,j is divided into three parts, namely a high detail part, a middle detail part and a low detail part; determining the backlight value of an image by using a gray matrix I of an original image A in a region corresponding to a high detail part, a middle detail part and a low detail part, wherein the high detail part selects the maximum value of a sub-pixel in the region as the backlight value, the middle detail part adopts an error correction control method to determine the backlight value, the low detail part selects the sub-pixel value in the region for normalization, and the square root obtained is multiplied by 255 to be used as the backlight value, so that a backlight value matrix of 32 multiplied by 18 (R1 multiplied by S1) is obtained; in the formula r1×s1, r1= R, S1 =s.
In the embodiment 1, the division of the average value in the small block B i,j smaller than 3 is divided into low details, the area corresponding to the value is normalized by adopting the sub-pixel value of the area, and the square root obtained is multiplied by 255 to be used as the backlight value; the average value in the small block B i,j belongs to 3 to 5, and the area corresponding to the average value is used for obtaining the backlight value of the area by adopting an error correction control method; the average value of the inside of the small block B i,j is larger than 5, and the area selects the maximum value of the sub-pixels of the area as a backlight value.
Step (4), the matrix of the backlight value of 32×18 (R1×S1) obtained in the step (3) is subjected to fuzzy diffusion to finally become a fuzzy diffusion matrix of 1920×1080 (M×N); the diffusion method is a sliding window method, a window template is selected, the diffusion window template is 3×3 ((2t+1) × (2t+1)), and specific values in the diffusion template are determined by light diffusion actual measurement values. In the formula (2t+1) × (2t+1), t > =1, and t is a positive integer.
The diffusion method selected in this embodiment 1 is a sliding window method, a3×3 window template is selected, and the actual measurement results of specific values of the diffusion window template are as follows:
TABLE 1
| 0.057 | 0.1426 | 0.057 |
| 0.1071 | 0.2726 | 0.1071 |
| 0.057 | 0.1426 | 0.057 |
The specific operation of the step (4) is as follows:
(1.1) performing one-row expansion on the upper and lower parts of the outermost periphery of the 32X 18 (R1X S1) backlight value matrix obtained in the step (3) and one-row expansion on the left and right parts, the matrix of backlight values of 32×18 (r1×s1) is changed to a matrix of 34×20 ((r1+2) × (s1+2));
(1.2) for a 34×20 ((r1+2) × (s1+2)) matrix, the diffusion template is slid from the first pixel value, after which the template traverses the entire matrix to obtain a new 32×18 (r2×s2) backlight matrix, the new 32×18 (r2×s2) backlight matrix being the processed first matrix;
the specific steps are that the diffusion template and the matrix corresponding to 34 multiplied by 20 start to slide, the corresponding areas are multiplied and added, the average value after the addition is taken as backlight for the point after the first smoothing, and then the template traverses the whole matrix to obtain a new 32 multiplied by 18 backlight matrix;
(1.3) linearly expanding the new 32×18 (r2×s2) first matrix by one time to obtain a 64×36 (r3×s3) matrix, and expanding the 64×36 (r3×s3) matrix by one row up and down and one column left and right at the outermost periphery to obtain a matrix of 64×36 (r3×s3) to obtain 66×38 ((r3+2) × (s3+2));
(1.4) for a matrix of 66×38 ((r3+2) × (s3+2)), the diffusion template is slid from the first pixel value, after which the template is traversed over the entire matrix to obtain a new 64×36 (r4×s4) backlight matrix, the new 64×36 (r4×s4) backlight matrix being the processed second matrix;
The specific steps are that the diffusion template and the matrix corresponding to 66 multiplied by 38 start to slide, the corresponding areas are multiplied and added, the average value after the addition is taken as backlight for the point after the first smoothing, and then the template traverses the whole matrix to obtain a new 64 multiplied by 36 backlight matrix;
(1.5) repeating the 64×36 (R4×S 4) matrix for 2 times according to the steps (1.3) - (1.4), linearly expanding the matrix into 1920×1080 (MXN) matrix, and determining the compensation factors of each point through the pixel value corresponding to each point in the MXN matrix;
The specific steps are that the new second matrix of 64×36 is doubled, the new matrix of 64×36 is changed into a matrix of 128×72, the new matrix of 128×72 is taken as a third matrix after processing, the diffusion process (1.3) - (1.4) is carried out, the matrix of 128×72 is changed into a matrix of 256×144, the new matrix of 256×144 is taken as a fourth matrix after processing, the diffusion process (1.3) - (1.4) is carried out, the matrix of 256×144 is changed into a matrix of 512×288, the new matrix of 512×288 is taken as a fifth matrix after processing, finally, the fifth matrix of 512×288 is directly linearly expanded into a matrix of 1920×1080, and the compensation factors of each point are determined by the pixel value corresponding to each point in the matrix of 1920×1080.
And (5) the liquid crystal compensation algorithm of the original image low-frequency part A D is a linear compensation algorithm. The gray matrix I G obtained by the high frequency portion a G of the original image is multiplied by a factor of 1.5 to obtain a matrix I GP. And (3) adding corresponding matrix internal values of a matrix I GP obtained by linear stretching of the high-frequency part A G of the original image and a matrix I DP obtained by pixel compensation of the low-frequency part A D of the original image to obtain a final output pixel value I Z, and sending the final output pixel value I Z to a liquid crystal control module for displaying images.
When the device of the invention is used for realizing image display, compared with a display device which is not improved, the power consumption 23.562W of the image is displayed by the display device which is not improved, and the power consumption of the display device of the invention is 21.156W.
Example 2
Referring to fig. 1, a display device based on millimeter-level light control includes a liquid crystal display screen and a backlight module, the liquid crystal display screen includes a liquid crystal display panel 1; the backlight module 2 comprises a diffusion film 201, an incremental film 202, a quantum film 203, a backlight 204 and a reflecting film 205, wherein the backlight 204 is a miniLED lamp panel, and the distance between adjacent LED lamps is in millimeter level.
The specific operation steps of the dimming method are as follows:
Step (1): inputting an image, wherein the resolution of the original image is 1920 multiplied by 1080, dividing the original image into an original image high-frequency part A G and an original image low-frequency part A D through Gaussian filtering, and respectively converting the original image A, the original image high-frequency part A G and the original image low-frequency part A D into a gray matrix I, a gray matrix I G and a gray matrix I D by using three sub-pixels of R, G, B as each pixel point in the original image A, the original image high-frequency part A G and the original image low-frequency part A D;
The original image high-frequency part A G and the original image low-frequency part A D are obtained through Gaussian filtering, and the Gaussian formula is as follows:
In the above formula, G is the output, x 2+y2 is the square of the gaussian blur radius, σ is the standard deviation of the normal distribution, and e is a natural constant.
In this embodiment 2, the radius of the gaussian filter is selected to 15, the standard deviation of the normal distribution is selected to 2.5, the original image is subjected to the gaussian filter to obtain the low-frequency portion a D of the original image, and then the original image a is subtracted from the low-frequency portion a D of the original image to obtain the high-frequency portion a G of the original image.
Dividing a gray matrix I obtained by the original image in the step (1), a gray matrix I G obtained by an original image high-frequency part A G and a gray matrix I D obtained by an original image low-frequency part A D into 450 small block areas, wherein the number of pixels in each small block area is 64 multiplied by 68 ((M/R) multiplied by (N/S)), and the number of pixels in each small block area is 4352, so as to obtain pixel values corresponding to each small block area, and calculating the maximum value, the minimum value and the average value in each small block area; wherein r=30 is a row of the original image division corresponding small block, and s=15 is a column of the original image division corresponding small block; in the formula (M/R) x (N/S), wherein/is the divisor, R < M, S < N, M is the row of the original image, and N is the column of the original image;
Step (3), dividing the gray matrix I G of the high-frequency part A G of the original image obtained in the step (2) to obtain small blocks B i,j, I, j which represent the position coordinate values of the small blocks B i,j; the average value inside the small block B i,j is calculated, and the obtained value of the small block B i,j is divided into three parts, namely a high detail part, a middle detail part and a low detail part; determining the backlight value of an image by using a gray matrix I of an original image A in a region corresponding to a high detail part, a middle detail part and a low detail part, wherein the high detail part selects the maximum value of a sub-pixel in the region as the backlight value, the middle detail part adopts an error correction control method to determine the backlight value, the low detail part selects the sub-pixel value in the region for normalization, and the square root obtained is multiplied by 255 to be used as the backlight value, so that a 30 multiplied by 15 (R1 multiplied by S1) backlight value matrix is obtained; in the formula r1×s1, r1= R, S1 =s.
In the embodiment 2, the division of the average value in the small block B i,j smaller than 2 is divided into low details, the area corresponding to the value is normalized by adopting the sub-pixel value of the area, and the square root obtained is multiplied by 255 to be used as the backlight value; the average value in the small block B i,j belongs to the detail from 2 to 4, and the area corresponding to the average value adopts an error correction control method to obtain the backlight value of the area; the average value inside the B i,j small block is larger than 4, and the area selects the maximum value of the sub-pixels of the area as a backlight value.
Step (4), the 30×15 (R1×S1) backlight value matrix obtained in the step (3) is subjected to fuzzy diffusion to finally become a 1920×1080 (MxN) fuzzy diffusion matrix; the diffusion method is a sliding window method, a window template is selected, the diffusion window template is 3×3 ((2t+1) × (2t+1)), and specific values in the diffusion template are determined by light diffusion actual measurement values. In the formula (2t+1) × (2t+1), t > =1, and t is a positive integer.
The diffusion method selected in this embodiment 1 is a sliding window method, a3×3 window template is selected, and the actual measurement results of specific values of the diffusion window template are as follows:
TABLE 2
| 0.057 | 0.1426 | 0.057 |
| 0.1071 | 0.2726 | 0.1071 |
| 0.057 | 0.1426 | 0.057 |
The specific operation of the step (4) is as follows:
(1.1) performing one-row expansion on the top and bottom of the outermost periphery of the 30X 15 (R1X S1) backlight value matrix obtained in the step (3) and one-row expansion on the left and right, the backlight value matrix of 30×15 (r1×s1) is changed to a matrix of 32×17 ((r1+2) × (s1+2));
(1.2) for a matrix of 32×17 ((r1+2) × (s1+2)), the diffusion template is slid from the first pixel value, after which the template traverses the entire matrix to obtain a new 30×15 (r2×s2) backlight matrix, the new 30×15 (r2×s2) backlight matrix being the processed first matrix;
the specific steps are that the diffusion template and the matrix corresponding to 34 multiplied by 20 start to slide, the corresponding areas are multiplied and added, the average value after the addition is taken as backlight for the point after the first smoothing, and then the template traverses the whole matrix to obtain a new 30 multiplied by 15 backlight matrix;
(1.3) linearly expanding the newly arrived 30×15 (r2×s2) first matrix by one time to become a 60×30 (r3×s3) matrix, performing outermost upper and lower row expansion and left and right row expansion on the 60×30 (r3×s3) matrix, and changing the 60×30 (r3×s3) matrix into a 62×32 ((r3+2) × (s3+2)) matrix;
(1.4) for a 62×32 ((r3+2) × (s3+2)) matrix, the diffusion template is slid from the first pixel value, after which the template traverses the entire matrix to obtain a new 60×30 (r4×s4) backlight matrix, the new 60×30 (r4×s4) backlight matrix being the processed second matrix;
The specific steps are that the diffusion template and the matrix corresponding to 62 multiplied by 32 start to slide, the corresponding areas are multiplied and added, the average value after the addition is taken as backlight for the point after the first smoothing, and then the template traverses the whole matrix to obtain a new 60 multiplied by 30 backlight matrix;
(1.5) repeating the 60×30 (R4×S 4) matrix for 3 times according to the steps (1.3) - (1.4), linearly expanding the matrix into a 1920×1080 (MXN) matrix, and determining the compensation factors of each point through the pixel value corresponding to each point in the MXN matrix;
The specific steps are that the new 60×30 secondary matrix is doubled, the 60×30 secondary matrix is changed into 120×60 matrix, and the new 120×60 backlight matrix is used as the processed tertiary matrix; performing the diffusion processes (1.3) - (1.4) from the matrix of 120×60 to the matrix of 240×120, and using the new matrix of 240×120 backlight as the fourth matrix after processing; then the diffusion processes (1.3) - (1.4) are carried out, the matrix of 240×120 is changed into a 480×240 matrix, and a new 480×240 backlight matrix is used as a fifth matrix after processing; and (3) performing the diffusion processes (1.3) - (1.4), changing the matrix of 480×240 into a matrix of 960×480, taking the new matrix of 960×480 as a processed sixth matrix, finally, directly linearly expanding the sixth matrix of 960×480 into a matrix of 1920×1080, and determining the compensation factors of each point through the pixel values corresponding to each point in the matrix of 1920×1080.
And (5) the liquid crystal compensation algorithm of the original image low-frequency part A D is a linear compensation algorithm. The gray matrix I G obtained by the high-frequency part A G of the original image is multiplied by a coefficient of 1.7 to obtain a matrix I GP; and (3) adding corresponding matrix internal values of a matrix I GP obtained by linear stretching of the high-frequency part A G of the original image and a matrix I DP obtained by pixel compensation of the low-frequency part A D of the original image to obtain a final output pixel value I Z, and sending the final output pixel value I Z to a liquid crystal control module for displaying images.
When the device of the invention is used for realizing image display, compared with a display device which is not improved, the power consumption 26.854W of the image is displayed by the display device which is not improved, and the power consumption of the display device of the invention is 23.513W.
Example 3
Based on the method of partition dimming based on millimeter-level light control, the invention provides a new partition dimming control method, the invention is compared with the existing methods, the images are compared according to different control methods of the display device, meanwhile, the front-screen brightness is 800cd/m 2, compared with the method, the average power consumption of the images of the traditional display device of fifty images is 26.714W, the average power consumption measured by the device is 23.512W, and the power consumption is reduced by 11.986%. The simulation test is carried out according to the detail of fifty graphs, the backlight module is divided into 32×18 backlight areas according to the designed backlight areas, and then a 1920×1080 image is divided and input according to the set backlight partition number. The present example is divided into 576 partitions of 32×18 (r×s), but the number of partitions of the backlight module is not limited. The simulation experiment is carried out in an MATLAB R2018b environment, the tested images are 1920 multiplied by 1080, and the image quality is jointly estimated by adopting the common traditional peak signal-to-Noise Ratio (PSNR), entropy and average gradient. As can be seen from Table 3, when fifty graphs are tested, the evaluation index takes the average value of the fifty graphs, and compared with the root mean square method, the algorithm provided by the invention has more outstanding effect, the truncated noise which can appear in the image is restrained on a certain layering degree when the peak signal-to-noise ratio is improved, and compared with the root mean square method, the method provided by the invention has the advantage of 22.1%; entropy represents how much information is contained in an image, with greater entropy indicating more information is contained; the average gradient reflects the features of small detail contrast and texture variations in the image, as well as the sharpness of the image. As can be seen from Table 3, the average gradient of each image processed by the algorithm provided by the invention is larger than that of the original algorithm. The invention effectively improves the display quality of the liquid crystal display image.
TABLE 3 Table 3
It will be readily appreciated by those skilled in the art that the foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. A display device based on the dimming method comprises a liquid crystal display module (1) and a backlight module (2); the backlight module (2) comprises a diffusion film (201), an increment film (202), a quantum film (203), a backlight source (204) and a reflecting film (205), and is characterized in that the dimming operation is as follows:
Inputting an image A, separating a high-frequency part from a low-frequency part, wherein the high-frequency part of the original image is A G, the low-frequency part of the original image is A D, the high-frequency part A G of the original image is a place with a severe change of an image gray value, namely an edge area of the image, and the low-frequency part A D of the original image is a slow change area of the image gray value, namely a so-called gentle area; dividing the original image high-frequency part A G and the original image low-frequency part A D into corresponding small blocks according to the set partitions; two paths of operations are carried out on pixel values in small blocks, one path of operation is used for determining image details through a high-frequency part A G of an original image, the image is divided into three parts of high details, medium details and low details, the backlight value of each small block is determined according to different detail division backlight control methods, the other path of operation is used for carrying out pixel compensation on a low-frequency part A D of the original image, and finally, the high frequency and the low frequency are combined to form an output pixel value for displaying the image;
Step (1), inputting an image A, wherein the resolution of the image is MXN, dividing the original image into an original image high-frequency part A G and an original image low-frequency part A D through Gaussian filtering, wherein each pixel point in the original image A, the original image high-frequency part A G and the original image low-frequency part A D is composed of R, G, B sub-pixels, and converting the original image A, the original image high-frequency part A G and the original image low-frequency part A D into a gray matrix I, a gray matrix I G and a gray matrix I D respectively;
Dividing the gray matrix I of the original image obtained in the step (1), the gray matrix I G obtained by the high-frequency part A G of the original image and the gray matrix I D obtained by the low-frequency part A D of the original image into corresponding small blocks according to R multiplied by S, wherein the number of pixels in each small block is (M/R) multiplied by (N/S), obtaining pixel values corresponding to the small blocks, and calculating the maximum value, the minimum value and the average value in each small block; wherein R is the row of the corresponding small block of the original image division, S is the column of the corresponding small block of the original image division,/is the divisor, R < M, S < N, M is the row of the original image, N is the column of the original image;
Step (3), dividing the gray matrix I G of the high-frequency part A G of the original image obtained in the step (2) to obtain small blocks B i,j, I, j which represent the position coordinate values of the small blocks B i,j; the average value inside the small block B i,j is calculated, and the obtained value of the small block B i,j is divided into three parts, namely a high detail part, a middle detail part and a low detail part; determining a backlight value of an image by a gray matrix I of an original image A in a region corresponding to a high detail part, a middle detail part and a low detail part, wherein the high detail part selects the maximum value of a sub-pixel of the region as the backlight value, the middle detail part adopts the maximum value of the sub-pixel of the region and the difference between the maximum value and the average value of the sub-pixels of the region to determine the backlight value, the low detail part selects the sub-pixel value of the region to normalize, the square root obtained is multiplied by 255 to be used as the backlight value, and thus a R1 multiplied by S1 backlight value matrix is obtained, wherein R1 = R and S1 = S;
step (4), the backlight value matrix R1×S1 obtained in the step (3) is subjected to fuzzy diffusion to finally become a fuzzy diffusion matrix of MxN; the diffusion method is a sliding window method, a window template is selected, the diffusion window template is (2t+1) x (2t+1), t > =1, t is a positive integer, and a specific value in the diffusion template is required to be determined through an actual light diffusion measurement value;
the sliding window method is specifically operated as follows:
(1.1) extending the backlight matrix R1×S1 in one row up and down and extending the backlight matrix R1×S1 in one column left and right, respectively, to change the backlight matrix R1×S1 into a matrix of (R1+2) × (S1+2);
(1.2) for the matrix (R1+2) x (S1+2), sliding the diffusion template from the first pixel value, and traversing the entire matrix by the template to obtain an R2 x S2 matrix;
(1.3) linearly expanding the R2×S2 matrix by one time to obtain a R3×S3 matrix, performing row expansion on the outermost periphery of the R3×S3 matrix, and performing column expansion on the left and right sides of the outermost periphery of the matrix, wherein R3×S3 is changed into a matrix of (R3+2) × (S3+2);
(1.4) sliding the diffusion template from the first pixel value for the (r3+2) x (s3+2) matrix, and then traversing the entire matrix by the template to obtain an r4×s4 matrix;
and (1.5) repeating the R4 multiplied by S4 matrix for F times according to the steps (1.3) - (1.4), linearly expanding the matrix into an M multiplied by N matrix, and determining the compensation factors of each point through the pixel value corresponding to each point in the M multiplied by N matrix;
Wherein r=r1=r2, r2=2×r3=2×r4, s=s1=s2, s2=2×s3=2×s4, and F is a positive integer of 1 to 5;
Step (5), compensating the pixel value of the gray matrix I D of the original image low-frequency part A D obtained in the step (1) by the compensation factor obtained in the operation of the step (4), and obtaining a matrix I DP of the original image low-frequency part A D after compensation; then, the gray matrix I G of the high-frequency part A G of the original image is processed, and linear stretching is carried out to obtain a matrix I GP of the high-frequency part A G of the original image; and combining a matrix I GP obtained by linear stretching of a high-frequency part A G of the original image and a matrix I DP obtained by pixel compensation of a low-frequency part A D, determining a final output pixel value, and sending the final output pixel value to a display device based on millimeter-level light control for displaying the image.
2. A dimming method as claimed in claim 1, wherein: in the step (1), the original image high-frequency portion a G and the original image low-frequency portion a D are obtained by gaussian filtering, where a gaussian formula is:
In the above formula, G is the output, x 2+y2 is the square of the gaussian blur radius, σ is the standard deviation of the normal distribution, and e is a natural constant.
3. A dimming method as claimed in claim 1, wherein: in step (5), the liquid crystal compensation algorithm of the low-frequency part a D of the original image is a linear or nonlinear compensation algorithm, the gray matrix I G obtained by the high-frequency part a G of the original image is multiplied by a coefficient k, and the coefficient can be modified by judging the image characteristics to obtain a matrix I GP.
4. A dimming method as claimed in claim 1, wherein: in the step (5), matrix I GP obtained by linear stretching of the high-frequency part a G of the original image and matrix I DP obtained by pixel compensation of the low-frequency part a D of the original image are added to obtain a final output pixel value I Z, and the final output pixel value is sent to a liquid crystal control module for displaying images.
5. The display device based on the dimming method of claim 1, comprising a liquid crystal display module (1) and a backlight module (2); the backlight module (2) comprises a diffusion film (201), an increment film (202), a quantum film (203), a backlight source (204) and a reflecting film (205), and is characterized in that: the backlight source (204) is miniLED lamp panels or microLED lamp panels; the spacing between adjacent LED lamps is in millimeter level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110757722.1A CN113362777B (en) | 2021-07-05 | 2021-07-05 | Dimming method and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110757722.1A CN113362777B (en) | 2021-07-05 | 2021-07-05 | Dimming method and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113362777A CN113362777A (en) | 2021-09-07 |
| CN113362777B true CN113362777B (en) | 2024-05-14 |
Family
ID=77538333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110757722.1A Active CN113362777B (en) | 2021-07-05 | 2021-07-05 | Dimming method and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113362777B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117577032A (en) * | 2023-12-11 | 2024-02-20 | 惠科股份有限公司 | Display effect detection method and device of display equipment and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101424856A (en) * | 2007-10-31 | 2009-05-06 | 华晶科技股份有限公司 | Image- acquiring device for providing image compensating function and image compensation process thereof |
| JP2013015630A (en) * | 2011-07-01 | 2013-01-24 | Hitachi Consumer Electronics Co Ltd | Image display device, image display method, and image processing device |
| CN111105756A (en) * | 2018-10-26 | 2020-05-05 | 展讯通信（上海）有限公司 | Backlight compensation method and device for liquid crystal display image, storage medium and terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10777151B2 (en) * | 2018-10-10 | 2020-09-15 | HKC Corporation Limited | Driving method of display device and display device |
-
2021
- 2021-07-05 CN CN202110757722.1A patent/CN113362777B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101424856A (en) * | 2007-10-31 | 2009-05-06 | 华晶科技股份有限公司 | Image- acquiring device for providing image compensating function and image compensation process thereof |
| JP2013015630A (en) * | 2011-07-01 | 2013-01-24 | Hitachi Consumer Electronics Co Ltd | Image display device, image display method, and image processing device |
| CN111105756A (en) * | 2018-10-26 | 2020-05-05 | 展讯通信（上海）有限公司 | Backlight compensation method and device for liquid crystal display image, storage medium and terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113362777A (en) | 2021-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI610291B (en) | Liquid crystal display device and method of local dimming of the? liquid crystal display device | |
| KR101796718B1 (en) | Dynamic dimming led backlight | |
| CN1222159C (en) | Method for improving image gradation and image display device applying such method | |
| US9734748B2 (en) | Grayscale value setting method for liquid crystal panel and liquid crystal display | |
| TWI436344B (en) | Method of compensating for pixel data and liquid crystal display | |
| TWI421844B (en) | Liquid crystal display and method of driving the same | |
| CN105244007A (en) | Method and device for generating gray scale correction table of curved surface display screen | |
| US11114046B2 (en) | Display device and method for driving the same, driving apparatus, and computer-readable medium | |
| CN108665866A (en) | The method and display control method and device of acquisition backlight diffusion transport parameter | |
| CN109712584B (en) | Debugging method of liquid crystal display device | |
| CN104616631B (en) | Display method and device for MVA (multi-domain vertical alignment) wide viewing angle LCD (liquid crystal display) screen | |
| CN110838090B (en) | Backlight diffusion method for image processing based on residual error network | |
| CN107204175B (en) | Pixel driving method and panel driving circuit | |
| CN107180605A (en) | A kind of method for eliminating display device Mura, elimination display device Mura devices and display device | |
| CN108364615B (en) | Mura compensation method and Mura compensation system | |
| US9536326B2 (en) | Method of setting grayscale value of liquid crystal panel and liquid crystal display | |
| CN113362777B (en) | Dimming method and display device | |
| CN104332143B (en) | Display device and color conversion method thereof | |
| CN108281121A (en) | Show line for unit by-line luminance compensation, the method for calibration by continuous pixel in liquid crystal platen edge using method for processing video frequency | |
| WO2020259555A1 (en) | Display brightness debugging method and device | |
| WO2020020076A1 (en) | Gray scale setting method, display substrate and display device | |
| CN106652925A (en) | Image processing method and liquid crystal display | |
| CN113539187B (en) | Dimming method of display device and display device | |
| US11710438B2 (en) | Display data processing method of display device for determining gray-scale value using noise reduction function, display device, electronic device, and storage medium | |
| Xu et al. | 56.4: Invited Paper: Optimized Algorithm and BLU for Local Dimming of Automotive Displays |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |