CN117253459A - Gamma adjustment method for liquid crystal display - Google Patents
Gamma adjustment method for liquid crystal display Download PDFInfo
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- CN117253459A CN117253459A CN202311547158.6A CN202311547158A CN117253459A CN 117253459 A CN117253459 A CN 117253459A CN 202311547158 A CN202311547158 A CN 202311547158A CN 117253459 A CN117253459 A CN 117253459A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000003086 colorant Substances 0.000 claims description 5
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Classifications
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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
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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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
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The present invention relates to the field of display adjustment technology, and in particular, to a method for performing Gamma adjustment on a liquid crystal display. The invention adopts the following technical scheme: the color analyzer is used for collecting color gamut map coordinate values of 256 pure-color gray-scale pictures, converting the color gamut map coordinate values into RGB three-primary-color component data, comparing the RGB three-primary-color component data with RGB three-primary-color component data of a standard table after interpolation, selecting the closest data, and performing adjustment after constructing an LUT table. The invention has the beneficial effects that: the RGB three-primary-color component data of the liquid crystal display is obtained by directly obtaining the color gamut map coordinate value of the liquid crystal display and converting the color gamut map coordinate value, so that the data acquisition efficiency can be effectively improved; different parameters can be set according to the use requirements to adjust interpolation intervals, so that the adaptability of the liquid crystal display after adjustment under different use requirements is improved; meanwhile, a decomposition and reconstruction mode is adopted, and the LUT table is directly downloaded to a drive board of the liquid crystal display by using a burning tool on a computer system, so that external equipment is not required to be additionally arranged for placing the LUT table.
Description
Technical Field
The present invention relates to the field of display adjustment technology, and in particular, to a method for performing Gamma adjustment on a liquid crystal display.
Background
Gamma adjustment is a common method for adjusting a liquid crystal display, and the adjusted liquid crystal display has better display effect. In the prior art, data of RGB three primary colors of a liquid crystal display under different pure gray scales are respectively read through an acquisition tool, mean value interpolation is carried out on the acquired RGB three primary color data, and finally an external ROM or flash device is hung on the liquid crystal display for placing an LUT table to replace the LUT table. The existing method for Gamma adjustment of the liquid crystal display has low data acquisition efficiency and needs 256 times of data acquisition; the interpolation can not be adjusted according to different use requirements, and the adjustment result is not flexible enough; in addition, additional download hardware is required, which increases the hardware cost of the tuning process.
Disclosure of Invention
The invention aims to provide a Gamma adjustment method for a liquid crystal display, which aims to solve the problems of low data acquisition efficiency, poor adjustment adaptability and higher hardware cost in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method for Gamma adjustment of a liquid crystal display comprises the following steps:
s01, respectively reading color gamut map coordinate values of a pure color gray scale picture of the liquid crystal display under the conditions that three primary colors of R, G and B are (n, n, n) by utilizing a color analyzer, and recording the color gamut map coordinate values as x (n), y (n) and Lv (n), wherein n is an integer of 0-255.
S02, converting the color gamut map coordinate values of the pure-color gray-scale picture of the 256-group liquid crystal display obtained in the step S01 into RGB three-primary-color component data, wherein a specific conversion formula is as follows:
R(n)=3.0634*X(n)-1.3934*Y(n)-0.4758*Z(n)；
G(n)=-0.9693*X(n)+1.876*Y(n)+0.0416*Z(n)；
B(n)=0.0679*X(n)-0.2288*Y(n)+1.0691*Z(n)；
wherein X (n) =x (n)/y (n) Lv (n);
Y(n)=Lv(n)；
Z(n)=(1-x(n)-y(n))/y(n)*Lv(n)；
s03, interpolating the 256 groups of RGB tricolor component data obtained in the conversion in the step S02 to obtain N groups of RGB tricolor component data, wherein N is more than 256.
S04, converting 256 groups of color gamut map coordinate values x, y and Lv in the standard table into 256 groups of RGB three-primary-color component data according to the conversion mode of the step S02.
And S05, searching the data of the 256 groups of RGB tricolor component data closest to the standard version obtained in the step S04 from the N groups of RGB tricolor component data obtained in the step S03, and obtaining a LUT table for Gamma correction according to the data.
S06, adjusting the liquid crystal display by using the LUT table obtained in the step S05.
Specifically, in the interpolation of 256 sets of RGB three-primary-color component data in step S03, the following method is adopted: respectively constructing a second-order Bezier curve formula for RGB three-primary-color component data:
XR(t)=(1-t)^2*R(n)+2*t*(1-t)*R(n+1)+t^2*R(n+2)；
XG(t)= (1-t)^2*G(n)+2*t*(1-t)*G(n+1)+t^2*G(n+2)，
XB(t)= (1-t)^2*B(n)+2*t*(1-t)*B(n+1)+t^2*B(n+2) ；
wherein: n=0, 3, 6..252, t is a 100 equally spaced array of values for the interval 0 to 1, i.e. t=linspace (0,1,100);
for each N value of each second-order Bezier curve formula, 100 values can be correspondingly obtained, M interpolation values are selected from the 100 values, and N groups of RGB three-primary-color component data can be obtained, wherein N=85 (M+1) +1.
Specifically, when M interpolations are selected from 100 values, the M interpolations may be selected by a fixed interval, that is, the selected interpolations are:
YR(m)=XR(km+j)，YG(m)=XG(km+j)，YB(m)=XB(km+j)；
wherein m=0, 1,2, … …, M-1; k is the interval between interpolation, j is the initial value, k, j are all positive integer times of the minimum interval of t, and 0 < km+j < 1 is satisfied.
Specifically, in step S06, when the LUT table is used for adjustment, the following method is adopted: and (3) obtaining a burning file of an IC chip of the liquid crystal display by using a burning tool, decomposing the burning file into a form of a file head part, an LUT table and a file tail part in a computer, replacing the LUT table obtained in the step S05 with the decomposed LUT table part, reconstructing the LUT table part to form a new burning file, and finally downloading the new burning file into a driving plate of the liquid crystal display by using the burning tool to finish Gamma adjustment of the liquid crystal display.
Further, after step S06, the color analyzer is used again to obtain the color gamut map coordinate values of the adjusted display under different pure gray scales, and compare the color gamut map coordinate values with the standard table, and the display effect of the liquid crystal display is adjusted by adjusting the k and j values in step S03 according to the use requirement.
The invention has the beneficial effects that: the RGB three-primary-color component data of the liquid crystal display is obtained by directly obtaining the color gamut map coordinate value of the liquid crystal display and converting the color gamut map coordinate value, so that the data acquisition efficiency can be effectively improved; interpolation is obtained by constructing a second-order Bezier curve formula, different parameters can be set according to the use requirements to adjust interpolation intervals, and the adaptability of the liquid crystal display after adjustment under different use requirements is improved; meanwhile, a decomposition and reconstruction mode is adopted, and the LUT table is directly downloaded to a drive board of the liquid crystal display by using a burning tool on a computer system, so that external equipment is not required to be additionally arranged for placing the LUT table.
Drawings
FIG. 1 is a flow chart of a method for Gamma adjustment of a liquid crystal display according to an embodiment;
FIG. 2 is a schematic diagram of a system for Gamma adjustment of a liquid crystal display according to an embodiment.
Description of the embodiments
Embodiment 1, referring to fig. 1, a method for Gamma adjustment of a liquid crystal display includes the following steps:
s01, respectively reading color gamut map coordinate values of a pure color gray scale picture of the liquid crystal display under the conditions that three primary colors of R, G and B are (n, n, n) by utilizing a color analyzer, and recording the color gamut map coordinate values as x (n), y (n) and Lv (n), wherein n is an integer of 0-255. The RGB values of the liquid crystal display can take integer values of 0-255, and when the RGB values of the liquid crystal display are equal, the liquid crystal display is a pure-color gray-scale picture, so that when data acquisition is carried out, data acquisition is carried out on 256 pure-color gray-scale pictures in total, only 256 times of data acquisition is needed because the coordinate values of the color gamut picture are directly acquired, and compared with the conventional data acquisition mode, the acquisition efficiency is higher because the component data of RGB three primary colors of the 256 pure-color gray-scale pictures are respectively acquired.
S02, converting the color gamut map coordinate values of the pure-color gray-scale picture of the 256-group liquid crystal display obtained in the step S01 into RGB three-primary-color component data, wherein a specific conversion formula is as follows:
R(n)=3.0634*X(n)-1.3934*Y(n)-0.4758*Z(n)；
G(n)=-0.9693*X(n)+1.876*Y(n)+0.0416*Z(n)；
B(n)=0.0679*X(n)-0.2288*Y(n)+1.0691*Z(n)；
wherein X (n) =x (n)/y (n) Lv (n);
Y(n)=Lv(n)；
Z(n)=(1-x(n)-y(n))/y(n)*Lv(n)；
s03, interpolating the 256 groups of RGB tricolor component data obtained in the conversion in the step S02 to obtain N groups of RGB tricolor component data, wherein N is more than 256. The interpolation method specifically comprises the following steps: respectively constructing a second-order Bezier curve formula for RGB three-primary-color component data:
XR(t)=(1-t)^2*R(n)+2*t*(1-t)*R(n+1)+t^2*R(n+2)；
XG(t)= (1-t)^2*G(n)+2*t*(1-t)*G(n+1)+t^2*G(n+2)，
XB(t)= (1-t)^2*B(n)+2*t*(1-t)*B(n+1)+t^2*B(n+2) ；
wherein: n=0, 3, 6..252, t is a 100 equally spaced array of values for the interval 0 to 1, i.e. t=linspace (0,1,100);
for each N value (corresponding to each three sets of RGB three-primary-color component data) of each second-order bezier curve formula, 100 values can be correspondingly obtained, and M interpolation values are selected from the 100 values, so that N sets of RGB three-primary-color component data can be obtained, wherein n=85 (m+1) +1. In selecting interpolation, in order to avoid repetition with the original 256 sets of RGB three-primary-color component data, the value at t=0 or t=1 is not selected. In selecting interpolation, the value of M may be set according to the adjustment accuracy requirement, in this embodiment, m=9, where n=1021, that is, from 100 values obtained from every three sets of original RGB three-primary-color component data (excluding t=0 and t=1, should be 98), 9 values are selected as interpolation, and form 1021 sets of RGB three-primary-color component data together with the original 256 sets of RGB three-primary-color component data.
Specifically, when M interpolations are selected from 100 values (m=9 in this embodiment), the interpolation may be selected by a fixed interval, that is, the selected interpolation is:
YR(m)=XR(km+j)，YG(m)=XG(km+j)，YB(m)=XB(km+j)；
wherein m=0, 1,2, … …, M-1; k is the interval between interpolation, j is the initial value, k, j are positive integer times of the minimum interval of t (in this embodiment, t is 100 equal interval value series of 0-1 interval, the minimum interval is 0.01), and 0 < km+j < 1 is satisfied. By setting different k and j values, the display effect of the liquid crystal display can be adjusted, and the adaptability of the liquid crystal display is improved.
S04, converting 256 groups of color gamut map coordinate values x, y and Lv in the standard table into 256 groups of RGB three-primary-color component data according to the conversion mode of the step S02.
And S05, searching the data of the 256 groups of RGB tricolor component data closest to the standard version obtained in the step S04 from the N groups of RGB tricolor component data obtained in the step S03, and obtaining a LUT table for Gamma correction according to the data.
S06, adjusting the liquid crystal display by using the LUT table obtained in the step S05. In the process of adjustment, the following method is adopted: and (3) obtaining a burning file of an IC chip of the liquid crystal display by using a burning tool, decomposing the burning file into a form of a file head part, an LUT table and a file tail part in a computer, replacing the LUT table obtained in the step S05 with the decomposed LUT table part, reconstructing the LUT table part to form a new burning file, and finally downloading the new burning file into a driving plate of the liquid crystal display by using the burning tool to finish Gamma adjustment of the liquid crystal display. Referring to fig. 2, in the present embodiment, the whole calibration system includes a color analyzer, a computer with Gamma correction software, and a writing tool, wherein the color analyzer and the writing tool are connected to a USB interface of the computer, and the writing tool is connected to a liquid crystal display to be calibrated through a DDC channel.
In a further embodiment, after step S06, the color analyzer may further be used to obtain the color gamut map coordinate values of the calibrated display under different pure gray scales, compare the color gamut map coordinate values with the standard table, and adjust the display effect of the liquid crystal display by adjusting the k, j values in step S03 according to the use requirement.
Of course, the above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all equivalent modifications made in the principles of the present invention are included in the scope of the present invention.
Claims (5)
1. A method for Gamma adjustment of a liquid crystal display is characterized by comprising the following steps:
s01, respectively reading color gamut map coordinate values of a pure color gray scale picture of the liquid crystal display under the conditions that three primary colors of R, G and B are (n, n, n) by using a color analyzer, and recording the color gamut map coordinate values as x (n), y (n) and Lv (n), wherein n is an integer of 0-255;
s02, converting the color gamut map coordinate values of the pure-color gray-scale picture of the 256-group liquid crystal display obtained in the step S01 into RGB three-primary-color component data, wherein a specific conversion formula is as follows:
R(n)=3.0634*X(n)-1.3934*Y(n)-0.4758*Z(n)；
G(n)=-0.9693*X(n)+1.876*Y(n)+0.0416*Z(n)；
B(n)=0.0679*X(n)-0.2288*Y(n)+1.0691*Z(n)；
wherein X (n) =x (n)/y (n) Lv (n);
Y(n)=Lv(n)；
Z(n)=(1-x(n)-y(n))/y(n)*Lv(n)；
s03, interpolating the 256 groups of RGB tricolor component data obtained in the conversion in the step S02 to obtain N groups of RGB tricolor component data, wherein N is more than 256;
s04, converting 256 groups of color gamut map coordinate values x, y and Lv in a standard table into 256 groups of RGB three-primary-color component data according to the conversion mode of the step S02;
s05, searching data of 256 groups of RGB tricolor component data closest to the standard version obtained in the step S04 from the N groups of RGB tricolor component data obtained in the step S03, and obtaining an LUT table for Gamma correction according to the data;
s06, adjusting the liquid crystal display by using the LUT table obtained in the step S05.
2. The method for Gamma adjustment of a liquid crystal display according to claim 1, wherein: in the step S03, when the interpolation is performed on the 256 sets of RGB three-primary-color component data, the following method is adopted: respectively constructing a second-order Bezier curve formula for RGB three-primary-color component data:
XR(t)=(1-t)^2*R(n)+2*t*(1-t)*R(n+1)+t^2*R(n+2)；
XG(t)= (1-t)^2*G(n)+2*t*(1-t)*G(n+1)+t^2*G(n+2)，
XB(t)= (1-t)^2*B(n)+2*t*(1-t)*B(n+1)+t^2*B(n+2) ；
wherein: n=0, 3, 6..252, t is a 100 equally spaced array of values for the interval 0 to 1, i.e. t=linspace (0,1,100);
for each N value of each second-order Bezier curve formula, 100 values can be correspondingly obtained, M interpolation values are selected from the 100 values, and N groups of RGB three-primary-color component data can be obtained, wherein N=85 (M+1) +1.
3. The method for Gamma adjustment of a liquid crystal display according to claim 2, wherein: when M interpolations are selected from 100 values, the M interpolations can be selected in a fixed interval mode, namely the selected interpolations are as follows:
YR(m)=XR(km+j)，YG(m)=XG(km+j)，YB(m)=XB(km+j)；
wherein m=0, 1,2, … …, M-1; k is the interval between interpolation, j is the initial value, k, j are all positive integer times of the minimum interval of t, and 0 < km+j < 1 is satisfied.
4. The method for Gamma adjustment of a liquid crystal display according to claim 1, wherein: in the step S06, when the LUT table is used for adjustment, the following method is adopted: and (3) obtaining a burning file of an IC chip of the liquid crystal display by using a burning tool, decomposing the burning file into a form of a file head part, an LUT table and a file tail part in a computer, replacing the LUT table obtained in the step S05 with the decomposed LUT table part, reconstructing the LUT table part to form a new burning file, and finally downloading the new burning file into a driving plate of the liquid crystal display by using the burning tool to finish Gamma adjustment of the liquid crystal display.
5. A method for Gamma adjustment of a liquid crystal display according to claim 3, wherein: after step S06, the color analyzer is used again to obtain the color gamut map coordinate values of the display under different pure gray scales after adjustment, and compare the color gamut map coordinate values with the standard table, and the display effect of the liquid crystal display is adjusted by adjusting the k and j values in step S03 according to the use requirement.
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