CN108417175B - A kind of LED display realizes the display methods of adjustable colour gamut - Google Patents
A kind of LED display realizes the display methods of adjustable colour gamut Download PDFInfo
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- CN108417175B CN108417175B CN201810157351.1A CN201810157351A CN108417175B CN 108417175 B CN108417175 B CN 108417175B CN 201810157351 A CN201810157351 A CN 201810157351A CN 108417175 B CN108417175 B CN 108417175B
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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]
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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
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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Abstract
The present invention relates to LED display technical fields, the display methods of adjustable colour gamut is realized more particularly to a kind of LED display, this method applies different electric currents to RGB luminescence chip by compensation formula, realize the compensation to the original three primary colours of LED, new LED three primary colours are obtained, to realize the adjusting of color gamut space.The present invention realizes that display colour gamut is adjusted, meets the colour gamut requirement under different occasions, compatibility with higher by converting to three primary colours coordinate.
Description
Technical Field
The invention relates to the technical field of LED display screens, in particular to a display method for realizing adjustable color gamut of an LED display screen.
Background
The LED display screen provided by the prior art obtains a corresponding color gamut space through three primary colors of an LED light emitting chip. Therefore, the color gamut space determined by the prior art is determined by the emission wavelengths of the red, green and blue chips. However, in the application fields such as television broadcasting and movie theaters, the requirements for the color gamut space are strict, and customized setting is required. There are two approaches to this solution:
1. customization of color gamut from selection of emission band of LED light source
2. Customization of power drive of LED chip from software design
The process of mass production for solving the customization problem from the light-emitting waveband of the LED chip has high cost of the chip, and the color gamut is fixed, cannot be adjusted and has poor compatibility. The invention realizes the customization of the color gamut and the adjustment of the color gamut by applying different current compensation to the light-emitting chip and redefining the three primary colors on the basis of the prior art through a software design method. The requirements of different application occasions on the color gamut are met.
Disclosure of Invention
In order to solve the technical defects, the invention provides a display method for realizing adjustable color gamut of an LED display screen. The invention realizes the adjustment of the display color gamut by transforming the three primary color coordinates, meets the color gamut requirements in different occasions, and has higher compatibility.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a display method for realizing adjustable color gamut of an LED display screen applies different currents to RGB light-emitting chips through a compensation formula to realize the compensation of the original three primary colors of an LED and obtain new three primary colors of the LED, thereby realizing the adjustment of the color gamut space.
Further, the CIE1931 color coordinate of the color gamut boundary point of the adjusted color gamut space is r1(xr1,yr1)、g1(xg1,yg1)、b1(xb1,yb1) The original coordinates r (x) of the red, blue and green light emitting chipsr,yr)、g(xg,yg)、b(xb,yb) Converting the CIE1931 coordinate into a tristimulus value, and compensating the tristimulus value to obtain a new CIE1931 coordinate, wherein the conversion compensation formula of the tristimulus value is as follows:
wherein,
data matrixCompensation matrix parameters for the required color gamut;
the original coordinate formulas of the red light, blue light and green light emitting chips in the color gamut space are as follows;
xλ＝X/(X+Y+Z)
yλ＝Y/(X+Y+Z)
λ is equal to r, g, b, X, Y, Z is the tristimulus value of r, g, b, respectively.
Further, the CIE1931 color coordinate of the color gamut boundary point is r1(xr1,yr1)、g1(xg1,yg1)、b1(xb1,yb1) The color coordinate of any point c (x, y) in the formed color gamut is;
c＝r(λ)r1+g(λ)g1+b(λ)b1
wherein r (λ), g (λ), b (λ) are RGB three primary color mixing factors.
Furthermore, the coordinates of c (x, y) are determined by the three-primary-color mixing factor and the compensated RGB three primary colors, and the c (x, y) is added with a compensation matrix K, so that the compensation of the target color gamut can be realized by calculating the matrix K, and the adjustability of any color gamut is achieved.
And further, converting the matrix K of the target color gamut into current compensation, and driving the LED light-emitting chip under the compensation current to realize the color gamut adjustment of the display screen.
The invention has the advantages that; the invention can realize the customization of the color gamut by applying different current compensation to the light-emitting chip and redefining the three primary colors on the basis of the prior art, can realize the adjustment of the color gamut and meets the requirements of different application occasions on the color gamut.
Drawings
Fig. 1 is a schematic diagram of a color gamut structure in one embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
a display method for realizing adjustable color gamut of an LED display screen mainly comprises a changeable CIE1931 color gamut boundary point, wherein the color gamut boundary point is determined by correcting the original light-emitting wavelength of an RGB LED chip through a compensation formula, so that the display color gamut displayed by an LED is determined; and the colors in the display color gamut are all corrected by a compensation formula to realize the mixing of RGB, so that the display of the colors in the color gamut is realized.
The CIE1931 color coordinate of the color gamut boundary point of the color gamut space is r1(xr1,yr1)、g1(xg1,yg1)、b1(xb1,yb1) Emitting red, blue and green lightOptical chip original coordinate r (x)r,yr)、g(xg,yg)、b(xb,yb) Converting the CIE1931 coordinate into a tristimulus value, and compensating the tristimulus value to obtain a new CIE1931 coordinate, wherein the conversion compensation formula of the tristimulus value is as follows:
wherein,
data matrixCompensation matrix parameters for the required color gamut;
the original coordinate formulas of the red light, blue light and green light emitting chips in the color gamut space are as follows;
xλ＝X/(X+Y+Z)
yλ＝Y/(X+Y+Z)
λ is equal to r, g, b, X, Y, Z is the tristimulus value of r, g, b, respectively.
CIE1931 color coordinate of color gamut boundary point is r1(xr1,yr1)、g1(xg1,yg1)、b1(xb1,yb1) The color coordinate of any point c (x, y) in the formed color gamut is;
c＝r(λ)r1+g(λ)g1+b(λ)b1
wherein r (λ), g (λ), b (λ) are RGB three primary color mixing factors.
The coordinates of c (x, y) are determined by the three-primary color mixing factor and the compensated RGB three-primary colors, and the c (x, y) is added with a compensation matrix K, and the compensation of the target color gamut can be realized by calculating the matrix K, so that the adjustability of any color gamut is realized.
And converting the matrix K of the target color gamut into current compensation, and driving the LED light-emitting chip under the compensation current to realize the color gamut adjustment of the display screen.
Example 2;
in order to further optimize the above technical solution, as shown in fig. 1, wavelengths of the LED red, green and blue chips are 460nm, 520nm, and 620nm, corresponding original CIE1931 coordinates are r (0.6915,0.3083), g (0.0743,0.8338), b (0.144,0.030), and tristimulus values are (25.63311.430.0057), (3.79642.64.695), (2.9080.60016.692).
In order to obtain a new gamut space r1(0.6658,0.334)、g1(0.2296,0.7543)、
b1The tristimulus values (30.07815.090.0102), (17.42457.241.218) and (2.9080.60016.692) corresponding to (0.144,0.030) require RGB compensation on the original color coordinates to obtain a compensation matrix K. By calculation, the matrix K can be obtained as
The coordinates of any point c (x, y) in the adjusted gamut can be obtained from the three primary color mixture factor and the compensated RGB coefficient K.
And converting the matrix K of the target color gamut into current compensation, and driving the LED light-emitting chip under the compensation current to realize the color gamut adjustment of the display screen.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A display method for realizing adjustable color gamut of an LED display screen is characterized in that different currents are applied to an RGB light-emitting chip through a compensation formula, so that the original three primary colors of an LED are compensated, new three primary colors of the LED are obtained, and the adjustment of color gamut space is realized;
the CIE1931 color coordinate of the color gamut boundary point of the adjusted color gamut space is r1(xr1，yr1)、g1(xg1，yg1)、b1(xb1，yb1) From red light and blue lightOriginal coordinate r (x) of light and green light emitting chipr，yr)、g(xg，yg)、b(xb，yb) Converting the CIE1931 coordinate into a tristimulus value, and compensating the tristimulus value to obtain a new CIE1931 coordinate, wherein the conversion compensation formula of the tristimulus value is as follows:
wherein,
data matrixCompensation matrix parameters for the required color gamut;
the original coordinate formulas of the red light, blue light and green light emitting chips in the color gamut space are as follows;
Xλ＝X/(X+Y+Z)
yλ＝Y/(X+Y+Z)
λ is equal to r, g, b, X, Y, Z is the tristimulus value of r, g, b, respectively.
2. The method as claimed in claim 1, wherein the CIE1931 color coordinates of the color gamut boundary points are r1(xr1，yr1)、g1(xg1，yg1)、b1(xb1，yb1) The color coordinate of any point c (x, y) in the formed color gamut is;
c＝r(λ)r1+g(λ) g1+b(λ) b1
wherein r (λ), g (λ), b (λ) are RGB three primary color mixing factors.
3. The method as claimed in claim 2, wherein the coordinates of c (x, y) are determined by the three primary color mixing factor and the compensated RGB three primary colors, and c (x, y) has added the compensation matrix K, and the compensation of the target color gamut can be achieved by calculating the matrix K, so as to achieve any color gamut adjustability.
4. The method as claimed in claim 3, wherein the matrix K of the target color gamut is converted into a current compensation, and the color gamut of the display screen is adjusted by driving the LED light-emitting chip at the compensation current.
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