CN110890057B - LED display screen color matching method based on chromaticity coordinate grading mixing - Google Patents

LED display screen color matching method based on chromaticity coordinate grading mixing Download PDF

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CN110890057B
CN110890057B CN201911238115.3A CN201911238115A CN110890057B CN 110890057 B CN110890057 B CN 110890057B CN 201911238115 A CN201911238115 A CN 201911238115A CN 110890057 B CN110890057 B CN 110890057B
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primary color
gtarget
btarget
rtarget
color
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CN110890057A (en
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毛新越
程宏斌
郭贵新
丁铁夫
陆文文
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Changchun Cedar Electronics Technology 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Abstract

The invention relates to a color matching method for an LED display screen based on graded mixing of chromaticity coordinates, which comprises the following steps: a display screen is formed by a plurality of types of tricolor light-emitting chips; drawing chromaticity coordinate points of all kinds of light-emitting chips in a CIE1931 chromaticity plane to form three coordinate stacks; drawing an inscribed triangle of the three coordinate stacks and taking the vertex coordinates of the inscribed triangle as a chromaticity coordinate target value of the three-primary-color matching; solving the tristimulus values of each primary color according to the brightness corrected by the three-primary-color light-emitting chip and calculating the target tristimulus values of the three primary colors according to the target value of the chromaticity coordinate; and obtaining a color matching coefficient matrix according to the target value of the chromaticity coordinates and the target tristimulus value, and multiplying the color matching coefficient matrix of each type by the correction coefficient of each light-emitting chip of the type, so that the color matching of the chromaticity coordinates graded light-emitting chips of different types of the display screen can be realized. The invention solves the technical problem of color deviation caused by mixed use of different types of light-emitting chips.

Description

LED display screen color matching method based on chromaticity coordinate grading mixing
Technical Field
The invention belongs to the technical field of LED display acquisition correction, and relates to a color matching method of an LED display screen.
Background
The LED chromaticity coordinate grading is a method for solving the problem of the dispersion of the self chromaticity of the LED. According to the method, the respective chromaticity coordinates of all the LED light-emitting chips are obtained according to the principle that each color corresponds to one chromaticity coordinate, and are classified, so that the LED light-emitting chips in the same class are ensured to have the same display color, and the problem of color deviation is avoided. Therefore, the LED light-emitting chips of the same type form a display screen, and the display screen has good color uniformity and good display quality.
However, in order to ensure that there is no chromaticity problem in the same category of light emitting chips, the classification range needs to be narrowed, the total number of classifications needs to be increased, and finally, there are dozens or even dozens of categories of light emitting chips of each color, which results in a relative reduction in the number of light emitting chips of each category. However, the number of light emitting pixels required by a high-density and large-size display screen is large, and the number of single light emitting chips cannot meet the number required by the display screen, so that two or more types of light emitting chips need to be mixed for application, so that chromaticity deviation is generated on the formed display screen, and the display effect is seriously influenced by the two or more types of different colors.
Disclosure of Invention
The invention aims to solve the technical problem of providing an LED display screen color matching method based on chromaticity coordinate grading mixing, which can solve the problem that the quantity of spliced display screens of chromaticity coordinate sorting light-emitting chips of the same category is not enough and solve the problem of color deviation of the display screens caused by mixed use of the light-emitting chips of different categories.
In order to solve the technical problem, the LED display screen color matching method based on the chromaticity coordinate graded mixing comprises the following steps:
step one, forming a display screen by using red, green and blue light-emitting chips subjected to chromaticity coordinate grading, and setting the type of the used red primary color light-emitting chip as kr，kr＝1,2,3...nrThe green primary color light-emitting chip is kg，kg＝1,2,3...ngThe kind of the blue primary color light emitting chip is kb，kb＝1,2,3...nbWherein n isr ng，nbThe total number of the categories of the three primary colors of red, green and blue respectively; let the chromaticity coordinate of each kind of red primary color light-emitting chip be (x)ri，yri),i＝1,2,3...krThe chromaticity coordinate of each kind of the green primary color light emitting chip is (x)gi，ygi),i＝1,2,3...kgThe chromaticity coordinate of each kind of the blue primary color light emitting chip is (x)bi，ybi),i＝1,2,3...kb；
Drawing chromaticity coordinate points (x) of all kinds of red, green and blue three-primary-color light-emitting chips in a CIE1931 chromaticity planeri，yri),(xgi，ygi),(xbi，ybi) (ii) a Chromaticity coordinates (x) of all red primary colorsri，yri) Form a red color coordinate stack, green primary color chromaticity coordinates (x)gi，ygi) Form a green color coordinate stack, and blue primary color chromaticity coordinates (x)bi，ybi) Forming a blue coordinate stack; finding and drawing an inscribed triangle of the three coordinate piles and determining three vertexes (x) of the trianglertarget，yrtarget)，(xgtarget，ygtarget)，(xbtarget，ybtarget) (ii) a Wherein (x)rtarget，yrtarget) As a chromaticity coordinate target value for red base color matching, (x)gtarget，ygtarget) As a chromaticity coordinate target value for the color matching of the green primary color, (x)btarget，ybtarget) As the target value of the chromaticity coordinate of the blue base color matching;
step three, performing brightness uniformity correction on all red, green and blue tricolor light-emitting chips on the display screen and recording the corrected red primary color brightness YrLuminance Y of the green primary colorgLuminance Y of blue primary colorb(ii) a Substituting all kinds of chromaticity coordinates of each primary color light-emitting chip into a formula (1) to obtain a tristimulus value of each kind of each primary color;
Figure BDA0002305427510000021
Figure BDA0002305427510000022
Figure BDA0002305427510000031
wherein Xri，Yri，ZriTristimulus value, X, of each kind of red primary color light-emitting chipgi，Ygi，ZgiTristimulus value, X, for each kind of green primary color red primary color light emitting chipbi，Ybi，ZbiThe tristimulus values of each kind of the blue primary color and the red primary color luminescent chip;
then the target value (x) of the chromaticity coordinate of the color matching of the three primary colors is calculatedrtarget，yrtarget)、(xgtarget，ygtarget)、(xbtarget，ybtarget) Substituting into formula (2) to obtain respective target tristimulus values X of red, green and bluertarget，Yrtarget，Zrtarget，Xgtarget，Ygtarget，Zgtarget，Xbtarget，Ybtarget，Zbtarget。
Figure BDA0002305427510000032
Yrtarget＝Yr
Figure BDA0002305427510000033
Figure BDA0002305427510000034
Ygtarget＝Yr
Figure BDA0002305427510000035
Figure BDA0002305427510000036
Ybtarget＝Yr
Figure BDA0002305427510000037
Step four, mixing (X)ri，Yri，Zri) As the first column, (X)gi，Ygi，Zgi) As the second column, (X)bi，Ybi，Zbi) Forming the original matrix H as a third columnoriWill be (X)rtarget，Yrtarget，Zrtarget) As the first column, (X)gtarget，Ygtarget，Zgtarget) As the second column, (X)btarget，Ybtarget，Zbtarget) Forming an object matrix H as a third columntarget：
Figure BDA0002305427510000041
Figure BDA0002305427510000042
Will be the original matrix HoriAnd an object matrix HtargetSubstituting into formula (3), the color matching coefficient matrix A of each kind is obtainedi；
Figure BDA0002305427510000043
Figure BDA0002305427510000044
Step five, matching color coefficient matrix A of each kindiAnd multiplying the correction coefficient of each luminous chip of the type to realize color matching of different types of chromaticity coordinate grading luminous chips of the display screen.
Because the target matrix is the same matrix, the color matching can ensure that the light-emitting chips with the same base color and the same type have no chromaticity problem and have no chromaticity problem among different types, thereby realizing the mixed use of the light-emitting chips with different types and different chromaticity coordinate grades and solving the problem of color deviation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of the distribution of chromaticity coordinates of three primary colors on the CIE1931 chromaticity plane.
Fig. 2 is a schematic diagram of an inscribed triangle of a three-primary chromaticity coordinate stack.
FIG. 3 is a flow chart of the present invention.
Detailed Description
As shown in fig. 3, the color matching method for the LED display screen based on the graded mixing of chromaticity coordinates of the invention comprises the following steps:
step one, forming a display screen by using red, green and blue luminescent chips subjected to chromaticity coordinate grading, and recording the type k of the red primary color luminescent chip used for forming the display screenr，kr＝1,2,3...nrThe type of the green primary color light-emitting chip is kg，kg＝1,2,3...ngThe kind of the blue primary color light emitting chip is kb，kb＝1,2,3...nb. Look over and record the chromaticity coordinate (x) of each kind of red primary color light-emitting chipri，yri)，i＝1,2,3...krChromaticity coordinate (x) of each kind of green primary color light emitting chipgi，ygi)，i＝1,2,3...kgChromaticity coordinate (x) of each kind of blue primary light emitting chipbi，ybi)，i＝1,2,3...kb。
Step two, all kinds of chromaticity coordinates (x) of the red primary color light-emitting chipri，yri) Chromaticity coordinates (x) of all kinds of green primary color light emitting chipsgi，ygi) And chromaticity coordinates (x) of all kinds of blue primary color light emitting chipsbi，ybi) And drawing the color coordinate of each primary color light-emitting chip of all kinds as a stack to form a color coordinate stack. Then, an inscribed triangle common to the three coordinate stacks is solved in the CIE color space, and three vertexes of the triangle are obtained. Recording three vertex chromaticity coordinates (x)rtarget，yrtarget)、(xgtarget，ygtarget)、(xbtarget，ybtarget) And is used as a chromaticity coordinate target value of the respective color matching of the three primary colors of red, green and blue.
And step three, lightening the display screen and correcting the brightness uniformity of the display screen. Then, brightness measurement is respectively carried out on the red primary color light-emitting chips of various types by utilizing a brightness meter to obtain brightness YrMeasuring the brightness of each green primary color light-emitting chip to obtain the brightness YgMeasuring the brightness of each blue primary color light-emitting chip to obtain the brightness Yb. Respectively converting the chromaticity coordinate (x) of each kind of red primary color light-emitting chipri，yri) And a luminance YrChromaticity coordinate (x) of each kind of green primary color light emitting chipgi，ygi) And a luminance YgChromaticity coordinate (x) of each kind of blue primary color light emitting chipbi，ybi) And a luminance YbSubstituting into formula (1) to obtain tristimulus values of each kind of tricolor light-emitting chip.
Figure BDA0002305427510000051
Figure BDA0002305427510000061
Figure BDA0002305427510000062
Xri，Yri，ZriTristimulus value, X, for each kind of red primary color light emitting chipgi，Ygi，ZgiTristimulus value, X, for each kind of green primary light emitting chipbi，Ybi，ZbiRecording X for tristimulus value of each kind of blue primary color light-emitting chipri，Yri，Zri，Xgi，Ygi，Zgi，Xbi，Ybi，Zbi. Then the target value (x) of the chromaticity coordinate of the color matching of each of the three primary colors is calculatedrtarget，yrtarget)、(xgtarget，ygtarget)、(xbtarget，ybtarget) Substituting into formula (2) to obtain respective target tristimulus values X of red, green and bluertarget，Yrtarget，Zrtarget，Xgtarget，Ygtarget，Zgtarget，Xbtarget，Ybtarget，Zbtarget。
Figure BDA0002305427510000063
Yrtarget＝Yr
Figure BDA0002305427510000064
Figure BDA0002305427510000065
Ygtarget＝Yr
Figure BDA0002305427510000066
Figure BDA0002305427510000067
Ybtarget＝Yr
Figure BDA0002305427510000068
Step four, the tristimulus value (X) of each kind of the red primary color light-emitting chipri，Yri，Zri) As a first column, the tristimulus value (X) of each kind of green primary light emitting chipgi，Ygi，Zgi) As a second column, the tristimulus value (X) of each kind of blue primary light emitting chipbi，Ybi，Zbi) As a third column, an original matrix H is constructedoriTarget tristimulus values (X) of red and primary colorsrtarget，Yrtarget，Zrtarget) As a first column, the target tristimulus value (X) of the green primary colorgtarget，Ygtarget，Zgtarget) As a second column, the target tristimulus value (X) of the primary color bluebtarget，Ybtarget，Zbtarget) As a third column, an object matrix H is formedtargetAs shown in equation (3):
Figure BDA0002305427510000071
Figure BDA0002305427510000072
will be the original matrix HoriAnd an object matrix HtargetSubstituting into the formula (4), the color matching coefficient matrix A of each kind is obtainedi。
Figure BDA0002305427510000073
Figure BDA0002305427510000074
Step five, matching color coefficient matrix A of each kindiAnd multiplying the correction coefficient of each luminous chip of the type to realize color matching of different types of chromaticity coordinate grading luminous chips of the display screen.
The color matching method of the invention enables different types of luminous chips which are graded by chromaticity coordinates to be mixed together without color deviation, thereby not only ensuring that no chromaticity problem exists in single type graded by chromaticity coordinates, but also ensuring that different types of luminous chips are mixed, and enabling the chromaticity coordinate grading method to be applied to an oversized display screen.

Claims (1)

1. A color matching method for an LED display screen based on chromaticity coordinate grading mixing is characterized by comprising the following steps:
step one, forming a display screen by using red, green and blue light-emitting chips subjected to chromaticity coordinate grading, and setting the type of the used red primary color light-emitting chip as kr，kr＝1,2,3...nrThe green primary color light-emitting chip is kg，kg＝1,2,3...ngThe kind of the blue primary color light emitting chip is kb，kb＝1,2,3...nbWherein n isr ng，nbThe total number of the categories of the three primary colors of red, green and blue respectively; let the chromaticity coordinate of each kind of red primary color light-emitting chip be (x)ri，yri),i＝1,2,3...krThe chromaticity coordinate of each kind of the green primary color light emitting chip is (x)gi，ygi),i＝1,2,3...kgThe chromaticity coordinate of each kind of the blue primary color light emitting chip is (x)bi，ybi),i＝1,2,3...kb；
Drawing chromaticity coordinate points (x) of all kinds of red, green and blue three-primary-color light-emitting chips in a CIE1931 chromaticity planeri，yri),(xgi，ygi),(xbi，ybi) (ii) a Chromaticity coordinates (x) of all red primary colorsri，yri) Form a red color coordinate stack, green primary color chromaticity coordinates (x)gi，ygi) Form a green color coordinate stack, and blue primary color chromaticity coordinates (x)bi，ybi) Forming a blue coordinate stack; finding and drawing an inscribed triangle of the three coordinate piles and determining three vertexes (x) of the trianglertarget，yrtarget)，(xgtarget，ygtarget)，(xbtarget，ybtarget) (ii) a Wherein (x)rtarget，yrtarget) As a chromaticity coordinate target value for red base color matching, (x)gtarget，ygtarget) As a chromaticity coordinate target value for the color matching of the green primary color, (x)btarget，ybtarget) As the target value of the chromaticity coordinate of the blue base color matching;
step three, performing brightness uniformity correction on all red, green and blue tricolor light-emitting chips on the display screen and recording the corrected red primary color brightness YrLuminance Y of the green primary colorgLuminance Y of blue primary colorb(ii) a Substituting all kinds of chromaticity coordinates of each primary color light-emitting chip into a formula (1) to obtain a tristimulus value of each kind of each primary color;
Figure FDA0002675145300000011
Figure FDA0002675145300000021
Figure FDA0002675145300000022
wherein Xri，Yri，ZriTristimulus value, X, of each kind of red primary color light-emitting chipgi，Ygi，ZgiTristimulus value, X, for each kind of green primary color red primary color light emitting chipbi，Ybi，ZbiThe tristimulus values of each kind of the blue primary color and the red primary color luminescent chip;
then the target value (x) of the chromaticity coordinate of the color matching of the three primary colors is calculatedrtarget，yrtarget)、(xgtarget，ygtarget)、(xbtarget，ybtarget) Substituting into formula (2) to obtain respective target tristimulus values X of red, green and bluertarget，Yrtarget，Zrtarget，Xgtarget，Ygtarget，Zgtarget，Xbtarget，Ybtarget，Zbtarget；
Figure FDA0002675145300000023
Yrtarget＝Yr
Figure FDA0002675145300000024
Figure FDA0002675145300000025
Ygtarget＝Yr
Figure FDA0002675145300000026
Figure FDA0002675145300000027
Ybtarget＝Yr
Figure FDA0002675145300000028
Step four, mixing (X)ri，Yri，Zri) As the first column, (X)gi，Ygi，Zgi) As the second column, (X)bi，Ybi，Zbi) Forming the original matrix H as a third columnoriWill be (X)rtarget，Yrtarget，Zrtarget) As the first column, (X)gtarget，Ygtarget，Zgtarget) As the second column, (X)btarget，Ybtarget，Zbtarget) Forming an object matrix H as a third columntarget：
Figure FDA0002675145300000031
Figure FDA0002675145300000032
Will be the original matrix HoriAnd an object matrix HtargetSubstituting into formula (3), the color matching coefficient matrix A of each kind is obtainedi；
Figure FDA0002675145300000033
Step five, matching color coefficient matrix A of each kindiAnd multiplying the correction coefficient of each luminous chip of the type to realize color matching of different types of chromaticity coordinate grading luminous chips of the display screen.
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