CN111901543A - Method for improving uniformity of liquid crystal display television - Google Patents
Method for improving uniformity of liquid crystal display television Download PDFInfo
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- CN111901543A CN111901543A CN202010777883.2A CN202010777883A CN111901543A CN 111901543 A CN111901543 A CN 111901543A CN 202010777883 A CN202010777883 A CN 202010777883A CN 111901543 A CN111901543 A CN 111901543A
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- uniformity
- liquid crystal
- ldef
- driving curve
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
Abstract
The invention discloses a method for improving the uniformity of a liquid crystal television, which comprises the following steps: setting an original driving curve Ldef and a uniformity threshold Pth; collecting brightness information of each pixel point of a display screen; partitioning the display screen, and extracting brightness information in the partitions; adjusting the driving curve Ldef according to the brightness information of each subarea; the finally adjusted drive curve Lhv is written into the drive, thereby completing the screen display of the liquid crystal television. According to the invention, the display screen is partitioned by setting a default driving curve and a uniformity index threshold value, and the brightness information and the like of the partitions are adjusted, so that the uniformity of the display screen of the liquid crystal television is improved; meanwhile, various scene requirements of the liquid crystal display television can be adaptively changed by setting the uniformity threshold, and the picture expression capability and the viewing effect of the liquid crystal display television are improved, so that the experience degree of a user is improved.
Description
Technical Field
The invention relates to the technical field of liquid crystal televisions, in particular to a method for improving uniformity of a liquid crystal television.
Background
At present, the uniformity requirement of a user on the liquid crystal display television is high, a manufacturer generally adopts modes of increasing the number of back lamps, reducing the lamp spacing, increasing diaphragms and the like to improve the uniformity of the liquid crystal display television, and the mode of compensating through hardware improves the uniformity to cause the increase of product cost, so that an implementation method for improving the uniformity of the liquid crystal display television without increasing the hardware cost is urgently needed, and the watching experience of consumers is improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for improving the uniformity of a liquid crystal television, and the method is used for adjusting the brightness of a display screen partition by setting a default driving curve and a uniformity index threshold value, so that the uniformity of the display screen of the liquid crystal television is improved.
In order to achieve the purpose, the invention adopts the technical scheme that: 1. a method for improving uniformity of a liquid crystal television comprises the following steps:
a, setting an original driving curve Ldef and a uniformity threshold Pth;
b, collecting brightness information of each pixel point of the display screen;
c, partitioning the display screen, and extracting the brightness information of the partitions;
step D, adjusting the original driving curve Ldef according to the brightness information of each partition;
and E, writing the finally adjusted driving curve Lhv into the driver for picture display.
Preferably, in the step C, the display screen is displayed according to a ratio of 16: and 9, partitioning the display screen into areas with the same size.
Preferably, the step C further includes analyzing a luminance difference ratio Phv of the partitions relative to the center of the screen according to the luminance information of the partitions,
Phv＝|(Yhv–Ycen)/Ycen|，
where Yhv is the luminance of the subareas and Ycen is the luminance of the central area of the screen.
Preferably, in the step D, when Phv > Pth, the original driving curve Ldef is adjusted according to the luminance Yhv of the partition and the luminance Ycen of the central area of the screen, so as to obtain an adjusted driving curve Lhv.
Preferably, the calculation formula of the adjusted driving curve is as follows:
Lhv＝[(Ycen-Yhv)/Ycen]*Ldef*K+Ldef，
wherein K is a correction coefficient and takes a value between +/-0.5 and 0.
Preferably, in the step D, when Phv ≦ Pth, the partition uniformity satisfies the requirement of the set uniformity threshold, and the adjusted driving curve Lhv is set as the original driving curve Ldef for writing driving.
The invention has the beneficial effects that:
the display screen is partitioned by setting a default driving curve and a uniformity index threshold value, and the brightness information and the like of the partitions are adjusted, so that the uniformity of the display screen of the liquid crystal television is improved; meanwhile, various scene requirements of the liquid crystal display television can be adaptively changed by setting the uniformity threshold, and the picture expression capability and the viewing effect of the liquid crystal display television are improved, so that the experience degree of a user is improved.
Drawings
Fig. 1 is a diagram illustrating an exemplary method for improving uniformity of an lcd tv according to an embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the relevant art to practice the invention. The embodiments described below are intended to be examples only, and other obvious modifications will occur to those skilled in the relevant art and are within the scope of the invention.
In one embodiment, as shown in fig. 1, the present invention provides a method for improving uniformity of a liquid crystal television, which comprises the following specific steps:
A. setting an original driving curve and marking as Ldef; meanwhile, setting a uniformity threshold value Pth;
B. collecting brightness information of each pixel point, and collecting the brightness of each pixel point of a display screen of the liquid crystal display television through a surface brightness meter to obtain the brightness information of the display screen;
C. partitioning the display screen, extracting brightness information of each region, including brightness information of a central region of the screen, and analyzing the brightness difference rate of each region relative to the central region of the screen; wherein the brightness information of the subareas is Yhv, Yhv is the average brightness of h rows and v columns, the brightness of the central area of the screen is Ycen, the brightness difference rate Phv of each subarea relative to the center of the screen is calculated according to a formula,
phv | (Yhv-Ycen)/Ycen | (formula 1).
D. Adjusting the driving curve according to the brightness information of each region;
if Phv is larger than Pth, the brightness difference rate is larger than the uniformity threshold value, the uniformity exceeds the requirement of the set uniformity threshold value, the brightness difference rate is unqualified, and the original driving curve Ldef needs to be adjusted. At this time, the method of calculating the adjusted driving curve Lhv is:
lhv ═ [ (Ycen-Yhv)/Ycen ] × Ldef × K + Ldef (formula 2)
Wherein K is a correction coefficient and takes a value between +/-0.5 and 0.
When Phv & gt Pth, if Yhv & lt Ycen, the original driving curve Ldef is subjected to increasing driving; if Yhv is greater than Ycen, the original driving curve Ldef is driven in a weakening mode; the adjusted drive curve Lhv is obtained by increasing or decreasing the original drive curve Ldef.
If Phv ≦ Pth, the luminance difference rate is smaller than the uniformity threshold, the uniformity meets the requirement of the set uniformity threshold, and the luminance difference rate is qualified; the original drive curve Ldef remains unchanged, and the adjusted drive curve Lhv is equal to Ldef.
And (4) repeating the steps B to C until Phv ≦ Pth, and entering the step E.
E. And writing the finally adjusted driving curve Lhv into the driving to display the picture, so that the uniformity of the liquid crystal display television is improved.
In another embodiment, the brightness information of a 4K lcd tv with a resolution of 3840 × 2160 is partitioned, the partition size is 256 × 144, and the number of partitions is 15 × 15.
According to the following steps of 16: 9, dividing the display screen into a plurality of regions with the same size, wherein the size of the partition is 16n × 9n, n is a positive integer, H is the horizontal direction, V is the vertical direction, and the screen resolution and the corresponding partition are shown in the following table:
| display screen | 2K | 4K | 8K |
| Resolution ratio | 1920×1080 | 3840×2160 | 7680×4320 |
| n | 8 | 16 | 32 |
| H-direction partition | 1920/(16*n) | 3840/(16*n) | 7680/(16*n) |
| V-direction partition | 1080/(9*n) | 2160/(9*n) | 4320/(9*n) |
| Number of partitions | 15×15 | 15×15 | 15×15 |
According to the invention, the brightness of the display screen subareas is adjusted by setting the default driving curve and the uniformity index threshold value, so that the uniformity of the liquid crystal display television display screen is improved; hardware cost is not increased, different brightness requirements can be provided through the transformation of the uniformity index threshold value, and the method is suitable for more scenes. Correspondingly, the method can be used for setting the contrast, the chromaticity, the definition and the like of the liquid crystal television in response, so that the picture expression capability and the viewing effect of the liquid crystal television are improved, and the experience degree of a user is improved.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. A method for improving uniformity of a liquid crystal television is characterized by comprising the following steps:
a, setting an original driving curve Ldef and a uniformity threshold Pth;
b, collecting brightness information of each pixel point of the display screen;
c, partitioning the display screen, and extracting the brightness information of the partitions;
step D, adjusting the original driving curve Ldef according to the brightness information of each partition;
and E, writing the finally adjusted driving curve Lhv into the driver for picture display.
2. The method for improving the uniformity of the liquid crystal television as claimed in claim 1, wherein in the step C, the display screen is processed according to the following steps of 16: and 9, partitioning the display screen into areas with the same size.
3. The method of claim 1, wherein the step C further comprises analyzing the brightness difference Phv of the partitions relative to the center of the screen according to the brightness information of the partitions,
Phv＝|(Yhv–Ycen)/Ycen|，
where Yhv is the luminance of the subareas and Ycen is the luminance of the central area of the screen.
4. The method as claimed in claim 3, wherein in step D, when Phv > Pth, the original driving curve Ldef is adjusted according to the brightness Yhv of the sub-region and the brightness Ycen of the central region of the screen to obtain an adjusted driving curve Lhv.
5. The method for improving the uniformity of the LCD TV according to claim 4, wherein the calculation formula of the adjusted driving curve is as follows:
Lhv＝[(Ycen-Yhv)/Ycen]*Ldef*K+Ldef，
wherein K is a correction coefficient and takes a value between +/-0.5 and 0.
6. The method of claim 3, wherein in step D, when Phv ≦ Pth, the partition uniformity satisfies the requirement of the set uniformity threshold, and the adjusted driving curve Lhv is set as the original driving curve Ldef for writing driving.
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