CN111161684A - Backlight control method and device, backlight module and display device - Google Patents

Backlight control method and device, backlight module and display device Download PDF

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CN111161684A
CN111161684A CN202010126062.2A CN202010126062A CN111161684A CN 111161684 A CN111161684 A CN 111161684A CN 202010126062 A CN202010126062 A CN 202010126062A CN 111161684 A CN111161684 A CN 111161684A
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area
region
backlight
gray scale
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CN111161684B (en
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耿立华
邹祥祥
曹磊
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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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
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

The embodiment of the invention provides a backlight control method, a backlight control 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 sub-areas, and the method comprises the following steps: determining the gray scales of the input image in the central area and each sub-area; determining backlight brightness corresponding to the central area and each sub-area according to the gray scales of the central area and each sub-area; and controlling backlight driving circuits corresponding to the central area and the sub-areas respectively to enable the central area and the sub-areas to emit light at backlight brightness corresponding to the central area and the sub-areas respectively. The backlight control method provided by the invention has the advantages of simple control, low cost and good light leakage prevention effect.

Description

Backlight control method and device, backlight module and display device
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 high development of display technology, the performance requirements and the use experience requirements of users for display devices are 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 backlight leakage at the edge of the display device becomes more and more significant, especially when the display device is viewed with dark ambient light or displays a black image (or when the image edge is black), and the leaked backlight can form a sharp contrast 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 scale mean value of the whole image, when most of the whole image is black, the backlight brightness is low, backlight light leakage is relieved, but for the image with a bright middle area and a dark edge area, the corresponding whole backlight brightness is high due to the high gray scale of the image, and the backlight light leakage and the black display edge area form obvious contrast; the second method is a local light control method, that is, an image is divided into regions, and the backlight brightness of the corresponding region is controlled according to the image gray-scale value of the corresponding region, however, the backlight driving and image processing method is complicated and costly. That is, in the conventional display device, there is a lack of a backlight control method that can achieve both the light leakage prevention effect and the cost.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are provided to provide a backlight control method, a backlight module and a display device that overcome or at least partially solve the above problems.
In order to solve the above problem, in a first aspect, an embodiment of the present invention discloses a backlight control method, which is applied to a display device, a display area of the display device is divided into a central area and an edge area, the edge area includes a plurality of sub-areas, and the method includes:
determining the gray scales of the input image in the central area and each sub-area;
determining backlight brightness corresponding to the central area and each sub-area according to the gray scales of the central area and each sub-area;
and controlling backlight driving circuits corresponding to the central area and the sub-areas respectively to enable the central area and the sub-areas to emit light at backlight brightness corresponding to the central area and the sub-areas respectively.
Optionally, the step of determining the gray levels of the input image in the central region and the sub-regions includes:
counting pixels of an input image in rows and columns;
determining pixels corresponding to the central area and each sub-area according to the counting of the rows and the columns;
and 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.
Optionally, the step of calculating the gray scales of the central region and each of the sub-regions according to the gray scales of the pixels corresponding to the central region and each of the sub-regions includes:
calculating the gray scale of the central area according to the gray scale of each pixel in the central area, and calculating the primary gray scale of each sub-area according to the gray scale of each pixel in each sub-area aiming at each sub-area;
and aiming at each sub-region, performing filtering processing on the primary gray scale of the sub-region by referring to the gray scale of the adjacent sub-region of the sub-region to obtain the gray scale of the sub-region.
Optionally, the step of, for each sub-region, referring to gray scales of adjacent sub-regions of the sub-region, and performing filtering processing on the primary gray scale of the sub-region to obtain a gray scale of the sub-region includes:
determining a neighboring sub-region of each of the sub-regions;
determining a weight value corresponding to each sub-region and the adjacent sub-region thereof, wherein the weight value of the adjacent sub-region is related to the distance from the adjacent sub-region to the sub-region;
and obtaining the gray scale of each subarea according to the primary gray scale and the weight of each subarea and the adjacent subareas of each subarea.
Optionally, the step of determining the backlight brightness corresponding to the central area and each of the sub-areas according to the gray scales of the central area and each of the sub-areas includes:
and determining the backlight brightness corresponding to the central area and each sub-area respectively according to the percentage of the gray scale of the central area and each sub-area to a preset gray scale.
In a second aspect, an embodiment of the present invention further discloses a backlight control apparatus, where the apparatus is applied to a display apparatus, a display area of the display apparatus is divided into a central area and an edge area, the edge area includes a plurality of sub-areas, and the apparatus includes:
the gray scale determining module is used for determining the gray scales of the input image in the central area and each sub-area;
the backlight brightness determining module is used for determining the backlight brightness corresponding to the central area and each sub-area according to the gray scales of the central area and each sub-area;
and the backlight control module is used for controlling backlight driving circuits corresponding to the central area and each sub-area respectively to enable the central area and each sub-area to emit light at the backlight brightness corresponding to each sub-area respectively.
Optionally, the determining module includes:
the counting submodule is used for counting rows and columns of pixels of the input image;
the pixel determination submodule is used for determining the central area and the pixels corresponding to the sub-areas according to the counting of the rows and the columns;
and the gray scale calculation submodule is used for 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.
Optionally, the gray scale calculation sub-module includes:
the primary gray scale calculation unit is used for calculating the gray scale of the central area according to the gray scale of each pixel in the central area and calculating the primary gray scale of each sub-area according to the gray scale of each pixel in each sub-area aiming at each sub-area;
and the gray scale calculation unit is used for referring to the gray scale of the adjacent sub-area of the sub-area for each sub-area and carrying out filtering processing on the primary gray scale of the sub-area to obtain the gray scale of the sub-area.
Optionally, the gray scale calculating unit includes:
a first determining subunit, configured to determine a neighboring sub-region of each sub-region;
a second determining subunit, configured to determine a weight corresponding to each of the sub-regions and its neighboring sub-region, where the weight of the neighboring sub-region is related to a distance from the neighboring sub-region to the sub-region;
and the gray scale calculating subunit is used for obtaining the gray scale of each subregion according to the primary gray scale and the weight of each subregion and the adjacent subregions thereof.
Optionally, the gray scale brightness determining module is further configured to determine backlight brightness corresponding to the central area and each of the sub-areas according to a percentage of gray scales of the central area and each of the sub-areas 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 present invention further discloses a display device, where the display device includes a display panel and the backlight module;
a 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 includes: the backlight driving circuit comprises a plurality of backlight light sources and a plurality of backlight driving circuits, wherein the backlight light source corresponding to the central area is driven by the first backlight driving circuit; and the backlight light sources corresponding to the sub-regions are respectively driven by the corresponding sub-region backlight driving circuits.
Optionally, the number of backlight light sources corresponding to each of the sub-regions is equal, and the central region is uniformly aligned with the backlight light sources corresponding to the edge regions.
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 a central area and an edge area, and the edge area is divided into a plurality of sub-areas. Since the central region occupies most of the whole display region, and the backlight light source corresponding to the central region can be driven by a corresponding first backlight driving circuit as a whole, the backlight driving and image processing modes in the backlight control device can be simpler and the cost is lower. And because the backlight light source corresponding to each sub-region of the edge region respectively adopts an independent sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved. Namely, the backlight control method provided by the invention can simultaneously take the advantages of simple control, low cost and better light leakage prevention effect into consideration.
Drawings
FIG. 1 is a schematic diagram of a display region of a display device according to the present invention;
FIG. 2 is a flowchart illustrating steps of a backlight control method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating 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 diagram of display effect when the gray levels of the sub-regions are not filtered;
FIG. 5 is a diagram of the display effect after filtering the gray levels of the sub-regions;
FIG. 6 is a diagram illustrating the display effect of the display device according to the embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an embodiment of a backlight control apparatus according to the present invention;
FIG. 8 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
description of reference numerals: 60-display panel, 601-high grayscale region, 602-low grayscale region, 61-backlight module, 611-high backlight brightness in center region, 612-low backlight brightness in edge region, 613-backlight source.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
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 structural diagram of a display area of a display device according to an embodiment of the present invention is shown, as shown in fig. 1, the display area of the display device is divided into a central area C0 and an edge area, and the edge area may include a plurality of sub-areas Cij.
In practical applications, the central region C0 may be distributed in the center of the display region for displaying the central region of the input image, and as shown in fig. 1, the central region C0 occupies most of the entire display region. The plurality of sub-regions Cij of the edge region may be distributed in the edge region of the display region, and surround the central region C0, and the plurality of sub-regions Cij of the central region may be used for displaying the edge region of the input image.
As shown in fig. 1, in the edge region, the top sub-regions are C11-C1 j, the bottom sub-regions are Ci 1-Cij, the left sub-regions are C11-Ci 1, and the right sub-regions are C1 j-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 is shown, which may specifically include the following steps:
step 201: determining the gray levels of the input image in the central area and each sub-area.
In this embodiment of the present invention, after receiving an input image, the display device may refer to the central region C0 and the sub-regions Cij of the edge region divided by the display region, divide the pixels on the input image into pixels corresponding to the central region C0 and pixels corresponding to the sub-regions Cij, and then determine the gray scales of the input image corresponding to the central region C0 and the sub-regions Cij according to the pixels of the input image corresponding to the central region C0 and the sub-regions Cij.
A method of determining the gray level of the input image in the central area C0 and in each sub-area Cij is provided below.
Referring to fig. 3, a flowchart of steps of a gray level determination method for 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 this embodiment of the present invention, the pixels of the input image may be counted in rows and columns with reference to the display area, and a row count n and a column count m of the pixels in the input image may be determined. The row count n may indicate that the pixel is located in the row, and the column count m may indicate that the pixel is located in the column. As shown in fig. 1, the value range of the row count N is 0 to N +2Y, the value range of the column count M is 0 to M +2X, and the position of each pixel point can be determined by counting the rows and columns of the pixels of the input image.
Specifically, the number of rows and columns may be counted according to the field sync, the line sync, and the valid pixel flag 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 sub-area according to the counting of the rows and the columns.
In the embodiment of the present invention, the pixels corresponding to the central area C0 and each sub-area Cij may 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 pixel points with the row count N of 0 to X may be determined as pixels corresponding to top sub-regions C11 to C1j of the edge region, the pixel points with the row count N + Y to N +2Y may be determined as bottom sub-regions Ci1 to C1j of the edge region, the pixel points with the column count M of 0 to Y may be determined as pixels corresponding to left sub-regions C11 to Ci1 of the edge region, and the pixel points with the column count M of M + X to M +2X may be determined as pixels corresponding to right sub-regions C1j to Cij of the edge region.
For example, the row count n is greater than or equal to 1 and less than or equal to X, the column count m is greater than or equal to 1 and less than or equal to Y, and all the pixels in between belong to the pixel 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, the pixels in the range all belong to the pixel corresponding to the central region C0, and so on, the pixels corresponding to the central region C0 and the sub-region Cij can be determined.
Step 2013: and 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.
In the embodiment of the present invention, the gray levels of the central region C0 and each sub-region Cij may be calculated according to the pixels corresponding to the central region C0 and each sub-region Cij, and in practical applications, the gray levels of the central region C0 and each sub-region Cij may be used to calculate the backlight brightness corresponding to the region.
Optionally, the gray scale calculation method for the central area C and each sub-area Cij mainly includes:
step S11: and calculating the gray scale of the central area according to the gray scale of each pixel in the central area, and calculating the primary gray scale of each sub-area according to the gray scale of each pixel in each sub-area aiming at each sub-area.
In the embodiment of the present invention, after the pixel corresponding to the central region C0 is determined, the gray scale of each pixel in the central region C0 may be calculated according to the region gray scale calculation method, and after the pixel corresponding to the sub-region Cij is determined, the gray scale of each pixel in the sub-region Cij may be calculated according to the region gray scale calculation method to calculate the primary gray scale of the sub-region Cij.
Specifically, the calculation method of the area gray scale may be an average value method or a gray histogram method. The calculation process of the average value method is to accumulate the gray scales of all pixels in the area and then calculate the average value. For example, the gray levels of the pixels in the sub-region C11 can be represented by Y11, Y12 … … Y1x, Y21, Y22 … … Y2x … … Yy1, and Y2 … … Yyx, and the gray level of the sub-region C11 can be the average value of the gray levels of the pixels: (Y11+ Y12+ … … Y1X + Y21+ Y22+ … … + Y2X + … … Yy1+ Yy2+ … … + Yyx)/X X Y, and the method is simple in calculation process and consumes less calculation resources. The calculation process of the gray histogram method may be: the method comprises the steps of firstly counting the histogram distribution of the gray scale of each pixel in a region, then taking the gray scale with the highest proportion as the gray scale of the region according to the gray scale distribution proportion of an image, and solving the problem of uneven brightness in the region and improving the precision of the gray scale of the region although the gray scale of the region calculated by adopting a gray histogram method consumes more resources.
It is understood 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 value method or a gray histogram method according to actual needs, which is not limited in the embodiment of the present invention.
Step S12: and aiming at each sub-region, performing filtering processing on the primary gray scale of the sub-region by referring to the gray scale of the adjacent sub-region of the sub-region to obtain the gray scale of the sub-region.
In the embodiment of the present invention, after the primary gray scale of each sub-region is determined, the primary gray scale of the sub-region may be filtered with reference to the gray scale of the adjacent sub-region of the sub-region to obtain the gray scale of the sub-region, so that the adjacent sub-region may be in smooth transition, and the display effect of the display device is prevented from being affected or light leakage of a small region is prevented from occurring due to sudden jump of the gray scale of the adjacent sub-region.
In practical applications, the higher the gray scale of a sub-region is, the higher the backlight brightness corresponding to the sub-region is. Therefore, when the gray levels of the sub-regions are not filtered, if there is a sudden change in gray level between adjacent sub-regions, light leakage 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 filtered is shown, as shown in fig. 4, when the gray scale of the adjacent sub-region in the edge region of the display device is suddenly changed, and the gray scale of the sub-region Ca is greatly larger than that of the adjacent sub-region, the backlight luminance of the sub-region Ca is correspondingly greatly larger than that of the adjacent sub-region, at this time, the backlight of the sub-region Ca is scattered (in the direction indicated by the arrow in the figure), that is, the backlight luminance of the sub-region adjacent to the sub-region Ca is also increased, and the phenomenon of light leakage of the small region is easily generated in this region.
Referring to fig. 5, a display effect diagram after filtering the gray scales of the sub-regions is shown, and as shown in fig. 5, the gray scales of the sub-regions are obtained, so that the adjacent sub-regions can be in smooth transition, and sudden jump of the gray scales of the adjacent sub-regions is avoided, so that a phenomenon of high light scattering in an edge region of the display region can be avoided, and a phenomenon of light leakage in a small region of the display device is avoided to a certain extent.
Optionally, the method for determining the gray scale of the sub-region may specifically 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 sub-area of each sub-area can be determined according to the actual situation.
For example, as shown in FIG. 5, when the gray scale of the sub-region Cb needs to be calculated, 4 sub-regions Cb-2, Cb-1, Cb +1 and Cb +2 adjacent to the left and right of the sub-region Cb can be determined as the adjacent sub-regions.
It is understood that, in practical applications, a person skilled in the art may use 2, 6, or 10 sub-regions adjacent to a sub-region as its adjacent sub-region according to actual needs, which is not limited by the embodiment of the present invention.
Step S22: and determining a weight value corresponding to each sub-region and the adjacent sub-region thereof, wherein the weight value of the adjacent sub-region is related to the distance from the adjacent sub-region to the sub-region.
In the embodiment of the present invention, after the adjacent sub-area of each sub-area is determined, the gray scale of the sub-area may be determined by using a weighted average method. Specifically, the weight 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 the sub-region Cb and its adjacent sub-regions Cb-2, Cb-1, Cb +2 can be represented as Yb、Yb-2、Yb-1、Yb+1、Yb+2The weight of the sub-region Cb and its neighboring sub-regions Cb-2, Cb-1, Cb +2 can be represented as Pb％、Pb-2％、Pb-1％、Pb+1％、Pb+2% represents, moreover, Pb% is higher weight, other weights are lower, and Pb-2％、Pb-1％、Pb+1％、Pb+2% weight is related to the distance from the corresponding region to the sub-region Cb, and the longer the distance is, the smaller the corresponding weight is.
In practical applications, the weight of the adjacent sub-region can 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 of each subarea and the adjacent subareas of each subarea.
In the embodiment of the invention, the gray scale of each sub-region can be determined by a weighted average method according to the weight of each sub-region and the adjacent sub-regions. The gray scale of the sub-region calculated by the weighted average method can comprehensively evaluate the influence of the primary gray scale of the adjacent sub-region on the gray scale of the sub-region due to the consideration of the primary gray scale and the weight of the adjacent sub-region, so that the adjacent sub-region can be in smooth transition, the sudden jump of the gray scale of the adjacent sub-region is avoided, and the phenomenon of light leakage of the small region 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 adopted to determine the gray scale of the sub-region Cb: pb*Yb+Pb-1％*Yb-1+Pb-2*Yb-2+Pb+1％*Yb+1+Pb+2％*Yb+2。
Step 202: and determining backlight brightness respectively corresponding to the central area and each sub-area according to the gray scales of the central area and each sub-area.
In the embodiment of the present invention, the backlight brightness corresponding to the central region C0 and each sub-region Cij may be determined according to the gray levels of the central region C0 and each sub-region Cij. In practical application, the value of the backlight brightness is 0% to 100%, 0% is backlight off, 100% represents the highest brightness of the backlight, the backlight brightness is linearly changed between 0% and 100%, and the conversion process is also linear.
In practical applications, the following method can be used to calculate the gray levels of the central region C0 and the sub-regions Cij: and determining the backlight brightness respectively corresponding to the central area C0 and each sub-area Cij 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 scale of the central area C0 or each sub-area Cij is Y, the luminance conversion formula may be: (Y/255) × 100% (when the gray scale value is 0-255), for example, when the gray scale Y of a region is 50, the backlight brightness corresponding to the region is (50/255) × 100% > -19.6%.
Step 203: and controlling backlight driving circuits corresponding to the central area and the sub-areas respectively to enable the central area and the sub-areas to emit light at backlight brightness corresponding to the central area and the sub-areas respectively.
In the embodiment of the present invention, the display device may include a display panel and a backlight module, 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 driving circuits, wherein the backlight source corresponding to the central area C0 is driven by the first backlight driving circuit; the backlight light sources corresponding to the sub-regions Cij are respectively driven by the corresponding sub-region backlight driving circuits, that is, the backlight light sources corresponding to the central region C0 and the sub-regions Cij of the edge region are independently controlled, so that the backlight brightness of the sub-regions Cij can be conveniently controlled according to actual conditions, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved.
In practical applications, after the backlight brightness of the central area C0 and each sub-area Cij is determined, the first backlight driving circuit may be controlled to drive the backlight source corresponding to the central area C0 to emit light at the corresponding backlight brightness, and the sub-area backlight driving circuit may be controlled to drive the backlight source corresponding to the sub-area Cij to emit light at the corresponding backlight brightness.
For example, when the backlight luminance of the center region C0 is 60% and the backlight luminance of a certain sub-region Cij is 30%, the backlight driving circuits corresponding to the two regions may be controlled to drive the backlight light sources corresponding to the two regions, so that the backlight luminances of the center region C0 and the sub-region Cij emit light according to 60% and 30% of the highest luminance, thereby achieving that the backlight luminance of the center region C0 is greater than that of the edge region, avoiding the backlight leakage phenomenon in the edge region, and improving the display effect of the display device.
Referring to fig. 6, which shows a display effect diagram of the display device according to the embodiment of the present invention, as shown in fig. 6, when the central region of the input image displayed on the display panel 60 is the high gray scale region 601 and the edge region is the low gray scale region 602, the backlight module 61 may control the backlight source corresponding to the high gray scale region 601 to emit light to form the high backlight brightness 611 in the central region, and control the backlight source corresponding to the low gray scale region 602 to emit light to form the low backlight brightness 612 in the edge region, so that the backlight brightness in the edge region of the display device is lower, and further, the phenomenon of edge backlight light leakage may be avoided.
In the embodiment of the present 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. Since the central region C0 occupies most of the entire display area, and the backlight light sources corresponding to the central region C0 can be driven by a corresponding one of the first backlight driving circuits as a whole, the backlight driving and image processing in the backlight control device can be simplified and the cost can be reduced. Since the backlight light sources corresponding to each sub-region Cij of the edge region respectively adopt the independent sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region Cij can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region C0, the phenomenon of backlight light leakage of the edge region 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 at least includes the following advantages:
in the embodiment of the invention, the display area of the display device is divided into a central area and an edge area, and the edge area is divided into a plurality of sub-areas. Since the central region occupies most of the whole display region, and the backlight light source corresponding to the central region can be driven by a corresponding first backlight driving circuit as a whole, the backlight driving and image processing modes in the backlight control device can be simpler and the cost is lower. And because the backlight light source corresponding to each sub-region of the edge region respectively adopts an independent sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved. Namely, the backlight control method provided by the invention can simultaneously take the advantages of simple control, low cost and better light leakage prevention effect into consideration.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement 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 the backlight control apparatus of the present invention is shown, and as shown in fig. 7, the backlight control apparatus 700 may specifically include the following modules:
a gray level determining module 701, configured to determine gray levels of the input image in the central region and the sub-regions.
A backlight brightness determining module 702, configured to determine, according to the gray scales of the central region and each of the sub-regions, backlight brightness corresponding to the central region and each of the sub-regions respectively.
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 corresponding backlight brightness.
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 central area and the pixels corresponding to the sub-areas according to the counting of the rows and the columns.
And the gray scale calculation submodule is used for 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.
Optionally, the gray scale calculation sub-module may include:
the primary gray scale calculation unit is used for calculating the gray scale of the central area according to the gray scale of each pixel in the central area and calculating the primary gray scale of each sub-area according to the gray scale of each pixel in each sub-area aiming at each sub-area;
and the gray scale calculation unit is used for referring to the gray scale of the adjacent sub-area of the sub-area for each sub-area and carrying out filtering processing on the primary gray scale of the sub-area to obtain the gray scale of the sub-area.
Alternatively, the gray scale calculating unit may include:
a first determining subunit, configured to determine a neighboring sub-region of each sub-region;
a second determining subunit, configured to determine a weight corresponding to each of the sub-regions and its neighboring sub-region, where the weight of the neighboring sub-region is related to a distance from the neighboring sub-region to the sub-region;
and the gray scale calculating subunit is used for obtaining the gray scale of each subregion according to the primary gray scale and the weight of each subregion and the adjacent subregions thereof.
Optionally, the gray scale brightness determining module 702 may be further configured to determine the backlight brightness corresponding to the central region and each of the sub-regions according to the percentage of the gray scale of the central region and each of the sub-regions to a preset gray scale.
In summary, the backlight control device according to the embodiment of the present invention at least has the following advantages:
in the embodiment of the invention, the display area of the display device is divided into a central area and an edge area, and the edge area is divided into a plurality of sub-areas. Since the central region occupies most of the whole display region, and the backlight light source corresponding to the central region can be driven by a corresponding first backlight driving circuit as a whole, the backlight driving and image processing modes in the backlight control device can be simpler and the cost is lower. And because the backlight light source corresponding to each sub-region of the edge region respectively adopts an independent sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved. Namely, the backlight control method provided by the invention can simultaneously take the advantages of simple control, low cost and better light leakage prevention effect into consideration.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiment of the present invention further provides a backlight module, which may include: the backlight control device.
In the embodiment of the invention, the display area of the display device is divided into a central area and an edge area, and the edge area is divided into a plurality of sub-areas. The central area occupies most of the whole display area, and the backlight light source corresponding to the central area can be driven by the 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 the backlight light source corresponding to each sub-region of the edge region respectively adopts an independent sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved. Namely, the backlight control method provided by the invention can simultaneously take the advantages of simple control, low cost and better light leakage prevention effect into consideration.
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, which comprises 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, the backlight module 61 may include: a plurality of backlight sources 613 and a plurality of backlight driving circuits (not shown), wherein the backlight source 613 corresponding to the central region is driven by a 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 present 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. Since the central region C0 occupies most of the entire display region, and the backlight source corresponding to the central region C0 can be driven by a corresponding first backlight driving circuit, the backlight driving and image processing modes in the backlight module are simple, and the cost is low. Since the backlight light source corresponding to each sub-region Cij of the edge region respectively adopts a separate sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region C0, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved. Namely, the backlight control method provided by the invention can simultaneously take the advantages of simple control, low cost and better light leakage prevention effect into consideration.
Optionally, the number of the 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 regions.
In practical applications, the number of the backlight sources 613 corresponding to each sub-region Cij is equal, and the central region C0 is aligned with the backlight sources 613 corresponding to the edge regions uniformly, 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 present invention at least has the following advantages:
in the embodiment of the invention, the display area of the display device is divided into a central area and an edge area, and the edge area is divided into a plurality of sub-areas. The central area occupies most of the whole display area, and the backlight light source corresponding to the central area can be driven by the 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 the backlight light source corresponding to each sub-region of the edge region respectively adopts an independent sub-region backlight driving circuit to perform local light control, the backlight brightness of each sub-region can be conveniently controlled according to actual conditions, so that the backlight brightness of the edge region is lower than that of the central region, the phenomenon of backlight light leakage of the edge region is avoided, and the display effect of the display device is improved. Namely, the backlight control method provided by the invention can simultaneously take the advantages of simple control, low cost and better light leakage prevention effect into consideration.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, 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 present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal 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 of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The backlight control method, the backlight control device, the backlight module and the display device provided by the invention are described in detail, and specific examples are applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiments is only used to help understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (13)

1. A backlight control method applied to a display device, a display area of the display device being divided into a central area and an edge area, the edge area including a plurality of sub-areas, the method comprising:
determining the gray scales of the input image in the central area and each sub-area;
determining backlight brightness corresponding to the central area and each sub-area according to the gray scales of the central area and each sub-area;
and controlling backlight driving circuits corresponding to the central area and the sub-areas respectively to enable the central area and the sub-areas to emit light at backlight brightness corresponding to the central area and the sub-areas respectively.
2. The method of claim 1, wherein the step of determining the gray levels of the input image in the central region and the sub-regions comprises:
counting pixels of an input image in rows and columns;
determining pixels corresponding to the central area and each sub-area according to the counting of the rows and the columns;
and 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.
3. The method of claim 2, wherein the step of calculating the gray levels of the central region and each of the sub-regions according to 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 area according to the gray scale of each pixel in the central area, and calculating the primary gray scale of each sub-area according to the gray scale of each pixel in each sub-area aiming at each sub-area;
and aiming at each sub-region, performing filtering processing on the primary gray scale of the sub-region by referring to the gray scale of the adjacent sub-region of the sub-region to obtain the gray scale of the sub-region.
4. The method according to claim 3, wherein the step of filtering the primary gray levels of the sub-regions with reference to the gray levels of the adjacent sub-regions of the sub-regions to obtain the gray levels of the sub-regions comprises:
determining a neighboring sub-region of each of the sub-regions;
determining a weight value corresponding to each sub-region and the adjacent sub-region thereof, wherein the weight value of the adjacent sub-region is related to the distance from the adjacent sub-region to the sub-region;
and obtaining the gray scale of each subarea according to the primary gray scale and the weight of each subarea and the adjacent subareas of each subarea.
5. The method according to claim 1, wherein the step of determining the backlight brightness corresponding to the central region and each of the sub-regions according to the gray levels of the central region and each of the sub-regions comprises:
and determining the backlight brightness corresponding to the central area and each sub-area respectively according to the percentage of the gray scale of the central area and each sub-area to a preset gray scale.
6. A backlight control apparatus applied to a display apparatus whose display area is divided into a central area and an edge area, the edge area including a plurality of sub-areas, the apparatus comprising:
the gray scale determining module is used for determining the gray scales of the input image in the central area and each sub-area;
the backlight brightness determining module is used for determining the backlight brightness corresponding to the central area and each sub-area according to the gray scales of the central area and each sub-area;
and the backlight control module is used for controlling backlight driving circuits corresponding to the central area and each sub-area respectively to enable the central area and each sub-area to emit light at the backlight brightness corresponding to each sub-area respectively.
7. The apparatus of claim 6, wherein the determining module comprises:
the counting submodule is used for counting rows and columns of pixels of the input image;
the pixel determination submodule is used for determining the central area and the pixels corresponding to the sub-areas according to the counting of the rows and the columns;
and the gray scale calculation submodule is used for 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.
8. The apparatus of claim 7, wherein the gray level calculation sub-module comprises:
the primary gray scale calculation unit is used for calculating the gray scale of the central area according to the gray scale of each pixel in the central area and calculating the primary gray scale of each sub-area according to the gray scale of each pixel in each sub-area aiming at each sub-area;
and the gray scale calculation unit is used for referring to the gray scale of the adjacent sub-area of the sub-area for each sub-area and carrying out filtering processing on the primary gray scale of the sub-area to obtain the gray scale of the sub-area.
9. The apparatus of claim 8, wherein the gray scale calculation unit comprises:
a first determining subunit, configured to determine a neighboring sub-region of each sub-region;
a second determining subunit, configured to determine a weight corresponding to each of the sub-regions and its neighboring sub-region, where the weight of the neighboring sub-region is related to a distance from the neighboring sub-region to the sub-region;
and the gray scale calculating subunit is used for obtaining the gray scale of each subregion according to the primary gray scale and the weight of each subregion and the adjacent subregions thereof.
10. The apparatus of claim 6,
the gray scale brightness determining module is further configured to determine backlight brightness corresponding to the central area and each of the sub-areas according to a percentage of a preset gray scale to a gray scale of the central area and each of the sub-areas.
11. A backlight module comprising the backlight control device as claimed in any one of claims 6 to 10.
12. A display device, comprising a display panel and the backlight module according to claim 11;
a 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 includes: the backlight driving circuit comprises a plurality of backlight light sources and a plurality of backlight driving circuits, wherein the backlight light source corresponding to the central area is driven by the first backlight driving circuit; and the backlight light sources corresponding to the sub-regions are respectively driven by the corresponding sub-region backlight driving circuits.
13. The display device according to claim 12, wherein the number of backlight light sources corresponding to each of the sub-regions is equal, and the central region is uniformly aligned with the backlight light sources corresponding to the edge regions.
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