Patent ID: 11862120
Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A method for calculating a chromaticity value of a white screen of a display device, comprising:
acquiring initial spectrum values of a first sub-pixel, a second sub-pixel, a third sub-pixel, and a backlight source of an initial display device, and calculating an initial transmittance spectrum value of a white screen of a display panel of the initial display device;
acquiring initial aperture ratios of the first sub-pixel, the second sub-pixel, and the third sub-pixel of the initial display device, presetting test aperture ratios of the first sub-pixel, the second sub-pixel, and the third sub-pixel of a test display device, and calculating relative variations of the test aperture ratios of the first sub-pixel, the second sub-pixel, and the third sub-pixel relative to the initial aperture ratios of the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively;
calculating a test transmittance spectrum value of a white screen of a display panel of the test display device according to the initial transmittance spectrum value and the relative variations of the test aperture ratios relative to the initial aperture ratios;
calculating tristimulus values of the test display device according to the test transmittance spectrum value, wherein the tristimulus values of the test display device comprise a red primary color tristimulus value X, a green primary color tristimulus value Y, and a blue primary color tristimulus value Z, and the red primary color tristimulus value X, the green primary color tristimulus value Y, and the blue primary color tristimulus value Z are calculated according to following formulas:

X=k∫λS(λ)·P(λ)·x(λ)dλ, 

Y=k∫λS(λ)·P(λ)·y(λ)dλ, 

Z=k∫λS(λ)·P(λ)·z(λ)dλ; 

wherein k is a tuning coefficient, λ is a wavelength, S(λ) is the initial spectrum value of the backlight source of the initial display device, P(λ) is the test transmittance spectrum value of the white screen of the display panel of the test display device, x(λ), y(λ), and z(λ) are respectively three spectrum tristimulus values of Standard Observer, and dλ represents a differential of the wavelength; and
calculating the chromaticity value of the white screen of the test display device according to the tristimulus values.