CN111161684B - Backlight control method and device, backlight module and display device - Google Patents
Backlight control method and device, backlight module and display device Download PDFInfo
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- 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
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- 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
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The embodiment of the invention provides a backlight control method, a device, a backlight module and a display device, wherein the backlight control method can be used for the display device, a display area of the display device is divided into a central area and an edge area, the edge area comprises a plurality of subareas, and the method comprises the following steps: determining gray scales of an input image in the central region and each sub-region; determining backlight brightness corresponding to the central region and each sub-region respectively according to the gray scale of the central region and each sub-region; and controlling the backlight driving circuits respectively corresponding to the central area and each subarea to enable the central area and each subarea to emit light with the backlight brightness respectively corresponding to the central area and each subarea. The backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight control method, a backlight module, and a display device.
Background
With the advanced development of display technology, the performance requirements and the use experience requirements of users on display devices are also higher and higher, for example, the size of the display devices is larger and larger. As the size of the display device increases, the phenomenon of light leakage from the backlight at the edge of the display device becomes more and more remarkable, especially when the ambient light is darker or a darker image is displayed (or the image edge is black), and the leaked backlight can be clearly contrasted with the black image.
In the prior art, the backlight leakage phenomenon at the edge of the display device can be improved in the following two ways: the first is a global light control mode, namely the brightness of the whole backlight is controlled according to the gray level average value of the whole image, when the whole image is mostly black, the brightness of the backlight is lower, the light leakage of the backlight is relieved, but for the image with a brighter middle area and a darker edge area, the brightness of the corresponding whole backlight is higher due to higher gray level of the image, and the light leakage of the backlight and the black display edge area form more obvious contrast; the second mode is a local light control mode, namely, the image is divided into areas, and the backlight brightness of the corresponding areas is respectively controlled according to the image gray scale values of the corresponding areas, however, the backlight driving and image processing modes are high in complexity and high in cost. That is, in the conventional display device, there is a lack of a backlight control method capable of achieving both the light leakage preventing effect and the cost.
Disclosure of Invention
In view of the foregoing, embodiments of the present invention are directed to providing a backlight control method, a backlight module, and a display device that overcome or at least partially solve the foregoing problems.
In order to solve the above-mentioned problems, in a first aspect, an embodiment of the present invention discloses a backlight control method applied to a display device, a display area of the display device being divided into a center area and an edge area, the edge area including a plurality of sub-areas, the method including:
determining gray scales of an input image in the central region and each sub-region;
determining backlight brightness corresponding to the central region and each sub-region respectively according to the gray scale of the central region and each sub-region;
and controlling the backlight driving circuits respectively corresponding to the central area and each subarea to enable the central area and each subarea to emit light with the backlight brightness respectively corresponding to the central area and each subarea.
Optionally, the step of determining the gray scale of the input image in the central region and each sub-region includes:
counting the number of rows and columns of pixels of an input image;
determining pixels corresponding to the central area and each sub-area according to the row and column counts;
And calculating the gray scales of the central region and the sub regions according to the gray scales of the pixels corresponding to the central region and the sub regions.
Optionally, the step of calculating the gray scales of the central area and each sub-area according to the gray scales of the pixels corresponding to the central area and each sub-area includes:
calculating the gray scale of the central region according to the gray scale of each pixel in the central region, and calculating the primary gray scale of each sub-region according to the gray scale of each pixel in the sub-region for each sub-region;
and for each subarea, referring to the gray scale of the adjacent subarea of the subarea, performing filtering processing on the primary gray scale of the subarea to obtain the gray scale of the subarea.
Optionally, the step of filtering the primary gray level of the sub-area with reference to the gray level of the adjacent sub-area of the sub-area to obtain the gray level of the sub-area includes:
determining adjacent subareas of each subarea;
determining the weight corresponding to each subarea and the adjacent subareas thereof, wherein the weight of the adjacent subareas is related to the distance from the adjacent subareas to the subareas;
And obtaining the gray scale of each subarea according to the primary gray scale and the weight value of each subarea and the adjacent subareas.
Optionally, the step of determining the backlight brightness corresponding to the central area and each sub-area respectively according to the gray scale of the central area and each sub-area includes:
and determining backlight brightness corresponding to the central region and each sub region respectively according to the gray scale of the central region and each sub region and the percentage of the preset gray scale.
In a second aspect, an embodiment of the present invention further discloses a backlight control device, where the device is applied to a display device, and a display area of the display device is divided into a central area and an edge area, and the edge area includes a plurality of sub-areas, and the device includes:
the gray level determining module is used for determining gray levels of the input image in the central area and each subarea;
the backlight brightness determining module is used for determining backlight brightness respectively corresponding to the central area and each subarea according to the gray scale of the central area and each subarea;
and the backlight control module is used for controlling the backlight driving circuits respectively corresponding to the central area and the subareas so that the central area and the subareas emit light with the backlight brightness respectively corresponding to the central area and the subareas.
Optionally, the determining module includes:
a counting sub-module for counting the rows and columns of pixels of the input image;
a pixel determining submodule, configured to determine pixels corresponding to the central area and each of the sub-areas according to the counts of the rows and the columns;
and the gray scale Ji Suanzi module is used for calculating the gray scales of the central area and the subareas according to the gray scales of the pixels corresponding to the central area and the subareas.
Optionally, the gray-scale calculation submodule includes:
a primary gray level calculating unit, configured to calculate a gray level of the central area according to a gray level of each pixel in the central area, and calculate, for each of the sub-areas, a primary gray level of the sub-area according to a gray level of each pixel in the sub-area;
the gray level calculation unit is used for referring to the gray level of the adjacent subareas of the subareas for each subarea, and performing filtering processing on the primary gray level of the subareas to obtain the gray level of the subareas.
Optionally, the gray-scale calculating unit includes:
a first determining subunit configured to determine an adjacent sub-area of each sub-area;
a second determining subunit, configured to determine a weight corresponding to each sub-region and an adjacent sub-region, where the weight of the adjacent sub-region is related to a distance from the adjacent sub-region to the sub-region;
The gray level calculating subunit is used for obtaining the gray level of each subarea according to the primary gray level and the weight value of each subarea and the adjacent subareas.
Optionally, the gray scale brightness determining module is further configured to determine backlight brightness corresponding to the central area and each sub-area respectively according to a percentage of gray scale of the central area and each sub-area to a preset gray scale.
In a third aspect, an embodiment of the present invention further provides a backlight module, including the backlight control device.
In a fourth aspect, the embodiment of the invention also discloses a display device, which comprises a display panel and the backlight module;
the display area of the display panel is divided into a central area and an edge area, and the edge area comprises a plurality of sub-areas;
the backlight module comprises: a plurality of backlight light sources and a plurality of backlight driving circuits, wherein the backlight light sources corresponding to the central area are driven by the first backlight driving circuits; and the backlight light sources corresponding to the subareas are respectively driven by the corresponding subarea backlight driving circuits.
Optionally, the number of backlight sources corresponding to each sub-region is equal, and the central region and the backlight sources corresponding to the edge regions are uniformly aligned.
The embodiment of the invention has the following advantages:
in the embodiment of the invention, the display area of the display device is divided into the central area and the edge area, and the edge area is divided into a plurality of subareas. The backlight light source corresponding to the central area can be integrally driven by a corresponding first backlight driving circuit, so that the backlight driving and image processing modes in the backlight control device are simpler and the cost is lower. And because each sub-area of the edge area corresponds to a backlight source which adopts an independent sub-area backlight driving circuit to carry out local light control, the backlight brightness of each sub-area can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved. That is, the backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
Drawings
Fig. 1 is a schematic view of a display area of a display device according to the present invention;
FIG. 2 is a flow chart of steps of an embodiment of a backlight control method according to an embodiment of the present invention;
FIG. 3 is a flowchart showing steps of a method for determining gray levels of an input image in a central region and sub-regions according to an embodiment of the present invention;
fig. 4 is a display effect diagram when the gray scale of each sub-region is not subjected to the filter processing;
fig. 5 is a display effect diagram after the gray scale of each sub-region is filtered;
fig. 6 is a display effect diagram of a display device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a backlight control apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
reference numerals illustrate: 60-display panel, 601-high gray scale region, 602-low gray scale region, 61-backlight module, 611-high backlight brightness in central region, 612-low backlight brightness in edge region, 613-backlight light source.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
The embodiment of the invention provides a backlight control method which can be particularly used for a display device.
Referring to fig. 1, a schematic structure of a display area of a display device according to an embodiment of the present invention is shown, and as shown in fig. 1, the display area of the display device is divided into a center area C0 and an edge area, and the edge area may include a plurality of sub-areas Cij.
In practical applications, the central area C0 may be distributed in a central position of the display area, and is used for displaying a central area of the input image, as shown in fig. 1, where the central area C0 occupies a majority of the entire display area. The plurality of sub-areas Cij of the edge area may be distributed in an edge zone of the display area around the central area C0 for one revolution, and the plurality of sub-areas Cij of the central area may be used for displaying the edge area of the input image.
As shown in fig. 1, in the edge region, the top subarea is C11 to C1j, the bottom subarea is Ci1 to Cij, the left subarea is C11 to Ci1, and the right subarea is C1j to Cij.
Referring to fig. 2, a flowchart illustrating steps of an embodiment of a backlight control method according to an embodiment of the present invention may specifically include the following steps:
step 201: and determining the gray scale of the input image in the central area and each subarea.
In the embodiment of the present invention, after receiving an input image, the display device may divide pixels on the input image by referring to a central area C0 and sub-areas Cij of an edge area divided by the display area, that is, divide the pixels on the input image into pixels corresponding to the central area C0 and pixels corresponding to each sub-area Cij, and then determine gray scales corresponding to the input image in the central area C0 and each sub-area Cij according to the pixels corresponding to the input image in the central area C0 and each sub-area Cij.
A gray-scale determination method of the input image in the center area C0 and each sub-area Cij is provided below.
Referring to fig. 3, a flowchart of a method for determining gray levels of an input image in a central area and each sub-area according to an embodiment of the present invention is shown, and as shown in fig. 3, the method may specifically include the following steps:
step 2011: the pixels of the input image are counted in rows and columns.
In the embodiment of the present invention, the display area may be referred to, and the pixel of the input image may be counted in rows and columns, so as to determine the row count n and the column count m of the pixel in the input image. The row count n may indicate which row the pixel is located in, and the column count m may indicate which column the pixel is located in. As shown in fig. 1, the range of the row count N is 0 to n+2y, the range of the column count M is 0 to m+2x, and the positions of the pixels can be determined by counting the rows and columns of the pixels of the input image.
Specifically, the counting of the rows and columns may be performed according to the field sync, the line sync, and the effective pixel mark signal of the input image, which is not limited in the embodiment of the present invention.
Step 2012: and determining the pixels corresponding to the central area and each subarea according to the row and column counts.
In the embodiment of the present invention, the pixels corresponding to the central area C0 and each sub-area Cij can be determined according to the row and column counts.
As shown in fig. 1, each sub-region Cij may include Y rows of pixels and X columns of pixels, and the central region C0 may include N rows of pixels and M columns of pixels. Specifically, the pixels with row counts N of 0 to X may be determined as the pixels corresponding to the top sub-areas C11 to C1j of the edge area, the pixels with row counts n+y to n+2y may be determined as the bottom sub-areas Ci1 to C1j of the edge area, the pixels with column counts M of 0 to Y may be determined as the pixels corresponding to the left sub-areas C11 to Ci1 of the edge area, and the pixels with column counts M of m+x to m+2x may be determined as the pixels corresponding to the right sub-areas C1j to Cij of the edge area.
For example, the pixels between the row count n being greater than or equal to 1 and less than or equal to X, the column count m being greater than or equal to 1 and less than or equal to Y belong to the pixels corresponding to the sub-region C11; and the row count N is greater than X and less than or equal to X+M, the column count M is greater than Y and less than or equal to Y+N, and the pixels in the range belong to the pixels corresponding to the central area C0 of the area, and the like, so that the pixels corresponding to the central area C0 and the sub area Cij can be determined.
Step 2013: and calculating the gray scales of the central region and the sub regions according to the gray scales of the pixels corresponding to the central region and the sub regions.
In the embodiment of the present invention, the gray scales of the central area C0 and each sub-area Cij can be calculated according to the pixels corresponding to the central area C0 and each sub-area Cij, and in practical application, the gray scales of the central area C0 and each sub-area Cij can be used to calculate the backlight brightness corresponding to the area.
Alternatively, the gray-scale calculation method for the central region C and each sub-region Cij may mainly include:
step S11: the gray scale of the central area is calculated according to the gray scale of each pixel in the central area, and the primary gray scale of each subarea is calculated according to the gray scale of each pixel in the subarea.
In the embodiment of the present invention, after determining the pixel corresponding to the central area C0, the gray scale of each pixel in the central area C0 may be calculated according to the calculation method of the area gray scale, and after determining the pixel corresponding to the sub-area Cij, the primary gray scale of the sub-area Cij may be calculated according to the calculation method of the area gray scale.
Specifically, the method for calculating the gray scale of the region may be an average method or a gray histogram method. The average value method is calculated by accumulating the gray scales of all pixels in the area and then averaging. For example, the gray scale of each pixel point in the sub-area C11 may be represented by Y11, Y12 … … Y1x, Y21, Y22 … … Y2x … … Yy1, yy2 … … Yyx, and the gray scale of the sub-area C11 may be an average value of the gray scales of each pixel: (Y11+Y12+ … … Y1x+Y21+Y22+ … … +Y2x+ … … Yy1+Yy2+ … … + Yyx)/X Y, the method has simple calculation process and less calculation resource consumption. The gray histogram method may be calculated as follows: the histogram distribution of the gray scales of each pixel in the region is counted, then the gray scale with the highest occupation ratio is taken as the gray scale of the region according to the gray scale distribution proportion of the image, and the gray scale of the region calculated by adopting a gray scale histogram method consumes more resources, but can well solve the condition of uneven brightness in the region and improve the precision of the gray scale of the region.
It will be appreciated that, in practical applications, those skilled in the art may calculate the gray level of the central area C0 and the primary gray level of the sub-area Cij by using an average method or a gray level histogram method according to actual needs, which is not limited in the embodiment of the present invention.
Step S12: and for each subarea, referring to the gray scale of the adjacent subarea of the subarea, performing filtering processing on the primary gray scale of the subarea to obtain the gray scale of the subarea.
In the embodiment of the invention, after the primary gray level of each subarea is determined, the primary gray level of the subarea can be subjected to filtering processing by referring to the gray level of the adjacent subarea of the subarea to obtain the gray level of the subarea, so that the adjacent subareas can be smoothly transited, and sudden jump of the gray level of the adjacent subareas is avoided, and the display effect of the display device is influenced or light leakage of a small area is prevented.
In practical application, the higher the gray level of the sub-region, the higher the backlight brightness corresponding to the region. Therefore, when gray scale is not filtered in each sub-region, if there is a gray scale discontinuity between adjacent sub-regions, a light leakage phenomenon due to high light scattering is likely to occur at the edge of the display device.
Referring to fig. 4, a display effect diagram when the gray scale of each sub-region is not subjected to the filtering process is shown, and as shown in fig. 4, when the gray scale of the adjacent sub-region in the edge region of the display device is greatly larger than the gray scale of the adjacent sub-region, the backlight brightness of the sub-region Ca is correspondingly greatly larger than the backlight brightness of the adjacent sub-region, and at this time, the backlight of the sub-region Ca scatters (in the direction indicated by the arrow in the figure) toward the adjacent sub-region, that is, the high light scattering, so that the backlight brightness of the adjacent sub-region of the sub-region Ca is also increased, and the phenomenon of small region light leakage is extremely easy to occur in such a region.
Referring to fig. 5, a display effect diagram after filtering the gray scale of each sub-area is shown, as shown in fig. 5, by obtaining the gray scale of the sub-area, so that adjacent sub-areas can be smoothly transited, and sudden jump of the gray scale of the adjacent sub-areas is avoided, so that the phenomenon of high light scattering in the edge area of the display area can be avoided, and the phenomenon of light leakage in the small area of the display device can be avoided to a certain extent.
Optionally, the method for determining the gray level of the sub-region specifically may include the following steps:
step S21: adjacent sub-regions of each of the sub-regions are determined.
In the embodiment of the invention, the adjacent subareas of each subarea can be determined according to actual conditions.
For example, as shown in fig. 5, when it is necessary to calculate the gray level of the sub-region Cb, 4 sub-regions Cb-2, cb-1, cb+1, cb+2 adjacent to each other on the left and right of the sub-region Cb may be determined as the adjacent sub-regions thereof.
It is understood that in practical application, those skilled in the art may take 2, 6 or 10 sub-areas adjacent to each other as their adjacent sub-areas according to actual needs, which is not limited in the embodiment of the present invention.
Step S22: and determining the weight corresponding to each subarea and the adjacent subareas, wherein the weight of the adjacent subareas is related to the distance from the adjacent subareas to the subarea.
In the embodiment of the present invention, after determining the adjacent subarea of each subarea, a weighted average method may be adopted to determine the gray level of the subarea. Specifically, the weights of the sub-region and its adjacent sub-regions may be set first.
For example, as shown in FIG. 5, the primary gray scale of a sub-region Cb and its neighboring sub-regions Cb-2, cb-1, cb+1, cb+2 may be denoted as Y b 、Y b-2 、Y b-1 、Y b+1 、Y b+2 The weights of the sub-region Cb and its neighboring sub-regions Cb-2, cb-1, cb+1, cb+2 can be expressed as P b ％、P b-2 ％、P b-1 ％、P b+1 ％、P b+2 % is expressed, and P b % is higher weight, other weights are lower, and P b-2 ％、P b-1 ％、P b+1 ％、P b+2 The weight of% is related to the distance from its corresponding region to the sub-region Cb, and the farther the distance is, the smaller the weight it corresponds to.
In practical applications, the weight of an adjacent sub-region may be used to measure the influence of the primary gray level of the sub-region on the gray level of the sub-region.
Step S23: and obtaining the gray scale of each subarea according to the primary gray scale and the weight value of each subarea and the adjacent subareas.
In the embodiment of the invention, the gray scale of each subarea can be determined by a weighted average method according to the weight of each subarea and the adjacent subareas. The gray scale of the subarea is obtained by a weighted average method, and the influence of the primary gray scale of the adjacent subarea on the gray scale of the subarea can be comprehensively evaluated by considering the primary gray scale and the weight of the adjacent subarea, so that the adjacent subarea can be smoothly transited, the sudden jump of the gray scale of the adjacent subarea is avoided, and the phenomenon of light leakage of the small area of the display device is avoided to a certain extent.
For example, for the display device shown in fig. 5, the following method may be employed to determine the gray scale of the sub-region Cb: p (P) b *Y b +P b-1 ％*Y b-1 +P b-2 *Y b-2 +P b+1 ％*Y b+1 +P b+2 ％*Y b+2 。
Step 202: and determining backlight brightness corresponding to the central region and each sub-region respectively according to the gray scale of the central region and each sub-region.
In the embodiment of the present invention, the backlight brightness corresponding to the central area C0 and each sub-area Cij can be determined according to the gray scale of the central area C0 and each sub-area Cij. In practical application, the backlight brightness is 0% to 100%,0% is the backlight extinction, 100% is the highest backlight brightness, the backlight brightness is linearly changed between 0% and 100%, and the conversion process is also linear.
In practical application, the gray scale of the center area C0 and each sub-area Cij may be calculated by the following method: and determining backlight brightness corresponding to the central area C0 and each sub-area Cij respectively according to the gray scale of the central area C0 and each sub-area Cij and the percentage of the preset gray scale.
Specifically, when the gray level of the center area C0 or each sub-area Cij is Y, the luminance conversion formula may be: (Y/255) 100% (when the gray level is 0-255), for example, when the gray level Y of the region is 50, the backlight brightness corresponding to the region is (50/255) 100% =19.6%.
Step 203: and controlling the backlight driving circuits respectively corresponding to the central area and each subarea to enable the central area and each subarea to emit light with the backlight brightness respectively corresponding to the central area and each subarea.
In an embodiment of the present invention, the display device may include a display panel and a backlight module, where a display area of the display panel may be divided into a central area C0 and an edge area, and the edge area may include a plurality of sub-areas Cij. The backlight module may include: a plurality of backlight light sources and a plurality of backlight driving circuits. Specifically, the backlight driving circuit may include a first backlight driving circuit and a plurality of sub-area light driving circuits, where a backlight light source corresponding to the central area C0 is driven by the first backlight driving circuit; the backlight sources corresponding to the subareas Cij are respectively driven by the corresponding subarea backlight driving circuits, namely, the central area C0 and the backlight sources corresponding to the subareas Cij of the edge area are independently controlled, so that the backlight brightness of the subareas Cij can be conveniently controlled according to actual conditions, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved.
In practical applications, after determining the backlight brightness of the central area C0 and each sub-area Cij, the first backlight driving circuit may be controlled to drive the backlight source corresponding to the central area C0 to emit light with the backlight brightness corresponding to the central area C0, and control the sub-area backlight driving circuit to drive the backlight source corresponding to the sub-area Cij to emit light with the backlight brightness corresponding to the sub-area Cij.
For example, when the backlight brightness of the central area C0 is 60% and the backlight brightness of a certain sub-area Cij is 30%, the corresponding backlight driving circuits of the two areas can be controlled to drive the backlight light sources corresponding to the two areas, so that the backlight brightness of the central area C0 and the backlight brightness of the sub-area Cij emit light according to 60% and 30% of the highest brightness, the backlight brightness of the central area C0 is higher than the backlight brightness of the edge area, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved.
Referring to fig. 6, a display effect diagram of a display device according to an embodiment of the present invention is shown in fig. 6, where, in a case where a central area of an input image displayed on a display panel 60 is a high gray scale area 601 and an edge area is a low gray scale area 602, a backlight module 61 may control a backlight source corresponding to the high gray scale area 601 to emit light to form a high backlight luminance 611 of the central area and a backlight source corresponding to the low gray scale area 602 to emit light to form a low backlight luminance 612 of the edge area, so that the nepheline luminance of the edge area of the display device is lower, and further, a phenomenon of edge backlight light leakage may be avoided.
In the embodiment of the invention, the display area of the display device is divided into the central area C0 and the edge area, and the edge area is divided into a plurality of sub-areas Cij. Because the central area C0 occupies most of the whole display area, and the backlight light source corresponding to the central area C0 can be integrally driven by a corresponding first backlight driving circuit, the backlight driving and image processing modes in the backlight control device are simpler and the cost is lower. And because the backlight light sources corresponding to each subarea Cij of the edge area respectively adopt independent subarea backlight driving circuits to carry out local light control, the backlight brightness of each subarea Cij can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area C0, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved.
In summary, the backlight control method according to the embodiment of the present invention may at least include the following advantages:
in the embodiment of the invention, the display area of the display device is divided into the central area and the edge area, and the edge area is divided into a plurality of subareas. The backlight light source corresponding to the central area can be integrally driven by a corresponding first backlight driving circuit, so that the backlight driving and image processing modes in the backlight control device are simpler and the cost is lower. And because each sub-area of the edge area corresponds to a backlight source which adopts an independent sub-area backlight driving circuit to carry out local light control, the backlight brightness of each sub-area can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved. That is, the backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Example two
The embodiment of the invention provides a backlight control device which can be particularly used for a display device. The display area of the display device may be divided into a central area and an edge area, and the edge area may include a plurality of sub-areas.
Referring to fig. 7, a schematic structural diagram of an embodiment of a backlight control apparatus according to the present invention is shown, and as shown in fig. 7, a backlight control apparatus 700 may specifically include the following modules:
a gray level determining module 701, configured to determine a gray level of the input image in the central area and each of the sub-areas.
The backlight brightness determining module 702 is configured to determine backlight brightness corresponding to the central area and each sub-area according to gray scales of the central area and each sub-area.
And a backlight control module 703, configured to control the backlight driving circuits corresponding to the central area and each of the sub-areas, so that the central area and each of the sub-areas emit light with backlight brightness corresponding to each of the sub-areas.
Optionally, the determining module includes:
and the counting submodule is used for counting the rows and the columns of the pixels of the input image.
And the pixel determination submodule is used for determining the pixels corresponding to the central area and each subarea according to the row and column counts.
And the gray scale Ji Suanzi module is used for calculating the gray scales of the central area and the subareas according to the gray scales of the pixels corresponding to the central area and the subareas.
Optionally, the gray-scale computation submodule may include:
a primary gray level calculating unit, configured to calculate a gray level of the central area according to a gray level of each pixel in the central area, and calculate, for each of the sub-areas, a primary gray level of the sub-area according to a gray level of each pixel in the sub-area;
the gray level calculation unit is used for referring to the gray level of the adjacent subareas of the subareas for each subarea, and performing filtering processing on the primary gray level of the subareas to obtain the gray level of the subareas.
Alternatively, the gray-scale calculating unit may include:
a first determining subunit configured to determine an adjacent sub-area of each sub-area;
a second determining subunit, configured to determine a weight corresponding to each sub-region and an adjacent sub-region, where the weight of the adjacent sub-region is related to a distance from the adjacent sub-region to the sub-region;
the gray level calculating subunit is used for obtaining the gray level of each subarea according to the primary gray level and the weight value of each subarea and the adjacent subareas.
Optionally, the gray-scale brightness determining module 702 may be further configured to determine backlight brightness corresponding to the central area and each of the sub-areas according to a percentage of gray-scale of the central area and each of the sub-areas to a preset gray-scale.
In summary, the backlight control apparatus according to the embodiment of the present invention may at least include the following advantages:
in the embodiment of the invention, the display area of the display device is divided into the central area and the edge area, and the edge area is divided into a plurality of subareas. The backlight light source corresponding to the central area can be integrally driven by a corresponding first backlight driving circuit, so that the backlight driving and image processing modes in the backlight control device are simpler and the cost is lower. And because each sub-area of the edge area corresponds to a backlight source which adopts an independent sub-area backlight driving circuit to carry out local light control, the backlight brightness of each sub-area can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved. That is, the backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
The embodiment of the invention also provides a backlight module, which can comprise: the backlight control device.
In the embodiment of the invention, the display area of the display device is divided into the central area and the edge area, and the edge area is divided into a plurality of subareas. The backlight light source corresponding to the central area can be integrally driven by a corresponding first backlight driving circuit, so that the backlight driving and image processing modes in the backlight module are simpler and the cost is lower. And because each sub-area of the edge area corresponds to a backlight source which adopts an independent sub-area backlight driving circuit to carry out local light control, the backlight brightness of each sub-area can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved. That is, the backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
The embodiment of the invention also provides a display device which can comprise a display panel and a backlight module; the display area of the display panel is divided into a central area C0 and an edge area including a plurality of sub-areas Cij.
Referring to fig. 8, a schematic structural diagram of a backlight module according to an embodiment of the present invention is shown, and as shown in fig. 8, a backlight module 61 may include: a plurality of backlight light sources 613 and a plurality of backlight driving circuits (not shown), wherein the backlight light sources 613 corresponding to the central region are driven by the first backlight driving circuit; the backlight light sources 613 corresponding to the sub-regions are driven by the corresponding sub-region backlight driving circuits, respectively.
In the embodiment of the invention, the display area of the display device is divided into the central area C0 and the edge area, and the edge area is divided into a plurality of sub-areas Cij. Because the central area C0 occupies most of the whole display area, and the backlight light source corresponding to the central area C0 can be integrally driven by a corresponding first backlight driving circuit, the backlight driving and image processing modes in the backlight module are simpler and the cost is lower. And because each sub-area Cij of the edge area corresponds to a backlight source which adopts an independent sub-area backlight driving circuit to perform local light control, the backlight brightness of each sub-area can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area C0, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved. That is, the backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
Optionally, the number of backlight sources 613 corresponding to each sub-region Cij is equal, and the central region C0 is uniformly aligned with the backlight sources 613 corresponding to the edge region.
In practical application, the number of the backlight sources 613 corresponding to each sub-region Cij is equal, and the central region C0 and the backlight sources 613 corresponding to the edge region are uniformly aligned, so that the backlight brightness emitted from the whole backlight module is uniform, and the display effect of the display device is further improved.
In summary, the display device according to the embodiment of the invention may at least include the following advantages:
in the embodiment of the invention, the display area of the display device is divided into the central area and the edge area, and the edge area is divided into a plurality of subareas. The backlight light source corresponding to the central area can be integrally driven by a corresponding first backlight driving circuit, so that the backlight driving and image processing modes in the backlight module are simpler and the cost is lower. And because each sub-area of the edge area corresponds to a backlight source which adopts an independent sub-area backlight driving circuit to carry out local light control, the backlight brightness of each sub-area can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge area is lower than that of the central area, the phenomenon of backlight light leakage in the edge area is avoided, and the display effect of the display device is improved. That is, the backlight control method provided by the invention can simultaneously realize the advantages of simple control, low cost and good light leakage prevention effect.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The above detailed description of a backlight control method, a backlight control device, a backlight module and a display device provided by the present invention applies specific examples to illustrate the principles and embodiments of the present invention, and the above examples are only used to help understand the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (11)
1. A backlight control method, characterized in that the method is applied to a display device whose display area is divided into a central area and an edge area, the edge area including a plurality of sub-areas, the method comprising:
determining gray scales of an input image in the central region and each sub-region;
determining backlight brightness corresponding to the central region and each sub-region respectively according to the gray scale of the central region and each sub-region;
controlling backlight driving circuits respectively corresponding to the central area and each subarea to enable the central area and each subarea to emit light with respectively corresponding backlight brightness;
wherein the area of the central region is larger than the area of the edge region;
the backlight driving circuit corresponding to the central area is a first backlight driving circuit; the backlight driving circuits corresponding to the subareas respectively are subarea backlight driving circuits;
the step of determining the backlight brightness corresponding to the central area and each sub-area respectively according to the gray scale of the central area and each sub-area comprises the following steps:
determining backlight brightness corresponding to the central region and each sub-region respectively according to the gray scale of the central region and each sub-region and the percentage of the preset gray scale;
The value range of the backlight brightness is 0% to 100%;
the backlight brightness is the same as the percentage.
2. The method of claim 1, wherein the step of determining the gray scale of the input image in the central region and each sub-region comprises:
counting the number of rows and columns of pixels of an input image;
determining pixels corresponding to the central area and each sub-area according to the row and column counts;
and calculating the gray scales of the central region and the sub regions according to the gray scales of the pixels corresponding to the central region and the sub regions.
3. The method of claim 2, wherein the step of calculating the gray levels of the central region and each of the sub-regions based on the gray levels of the pixels corresponding to the central region and each of the sub-regions comprises:
calculating the gray scale of the central region according to the gray scale of each pixel in the central region, and calculating the primary gray scale of each sub-region according to the gray scale of each pixel in the sub-region for each sub-region;
and for each subarea, referring to the gray scale of the adjacent subarea of the subarea, performing filtering processing on the primary gray scale of the subarea to obtain the gray scale of the subarea.
4. A method according to claim 3, wherein the step of filtering the primary gray level of the sub-region with reference to the gray level of the adjacent sub-region of the sub-region for each sub-region to obtain the gray level of the sub-region comprises:
determining adjacent subareas of each subarea;
determining the weight corresponding to each subarea and the adjacent subareas thereof, wherein the weight of the adjacent subareas is related to the distance from the adjacent subareas to the subareas;
and obtaining the gray scale of each subarea according to the primary gray scale and the weight value of each subarea and the adjacent subareas.
5. A backlight control apparatus, the apparatus being applied to a display apparatus whose display area is divided into a center area and an edge area, the edge area including a plurality of sub-areas, the apparatus comprising:
the gray level determining module is used for determining gray levels of the input image in the central area and each subarea;
the backlight brightness determining module is used for determining backlight brightness respectively corresponding to the central area and each subarea according to the gray scale of the central area and each subarea;
The backlight control module is used for controlling the backlight driving circuits respectively corresponding to the central area and the subareas to enable the central area and the subareas to emit light with respectively corresponding backlight brightness;
wherein the area of the central region is larger than the area of the edge region; the backlight driving circuit corresponding to the central area is a first backlight driving circuit; the backlight driving circuits corresponding to the subareas respectively are subarea backlight driving circuits;
the gray scale brightness determining module is further configured to determine backlight brightness corresponding to the central area and each sub-area respectively according to the gray scale of the central area and each sub-area and a percentage of a preset gray scale;
the value range of the backlight brightness is 0% to 100%;
the backlight brightness is the same as the percentage.
6. The apparatus of claim 5, wherein the means for determining comprises:
a counting sub-module for counting the rows and columns of pixels of the input image;
a pixel determining submodule, configured to determine pixels corresponding to the central area and each of the sub-areas according to the counts of the rows and the columns;
and the gray scale Ji Suanzi module is used for calculating the gray scales of the central area and the subareas according to the gray scales of the pixels corresponding to the central area and the subareas.
7. The apparatus of claim 6, wherein the gray-scale calculation submodule comprises:
a primary gray level calculating unit, configured to calculate a gray level of the central area according to a gray level of each pixel in the central area, and calculate, for each of the sub-areas, a primary gray level of the sub-area according to a gray level of each pixel in the sub-area;
the gray level calculation unit is used for referring to the gray level of the adjacent subareas of the subareas for each subarea, and performing filtering processing on the primary gray level of the subareas to obtain the gray level of the subareas.
8. The apparatus according to claim 7, wherein the gray-scale calculation unit includes:
a first determining subunit configured to determine an adjacent sub-area of each sub-area;
a second determining subunit, configured to determine a weight corresponding to each sub-region and an adjacent sub-region, where the weight of the adjacent sub-region is related to a distance from the adjacent sub-region to the sub-region;
the gray level calculating subunit is used for obtaining the gray level of each subarea according to the primary gray level and the weight value of each subarea and the adjacent subareas.
9. A backlight module comprising the backlight control apparatus according to any one of claims 5 to 8.
10. A display device, characterized in that the display device comprises a display panel and the backlight module according to claim 9;
the display area of the display panel is divided into a central area and an edge area, and the edge area comprises a plurality of sub-areas;
the backlight module comprises: a plurality of backlight light sources and a plurality of backlight driving circuits, wherein the backlight light sources corresponding to the central area are driven by the first backlight driving circuits; and the backlight light sources corresponding to the subareas are respectively driven by the corresponding subarea backlight driving circuits.
11. The display device of claim 10, wherein the number of backlight sources corresponding to each of the sub-regions is equal, and the central region is uniformly aligned with the backlight sources corresponding to the edge regions.
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| US20240185806A1 (en) * | 2021-09-29 | 2024-06-06 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Brightness regulating method, regulating system and displaying device |
| CN114203119B (en) * | 2021-12-06 | 2023-01-20 | 深圳Tcl新技术有限公司 | Display control method, display control device, electronic equipment and storage medium |
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