Patent ID: 7218358

Claim:
A method for calibrating color temperature of color display devices to calibrate output bases of three original color light signals to output to a color display device to allow the color temperature radiated from the display device to be proximate to a set objective color temperature, comprising the steps of: A. outputting RGB three original color light signals with known second output bases that range from 0 to 255 to the color display device; B. measuring the color temperature radiated from the color display device, and obtaining a second color coordinate and luminance in a standard reference color gamut corresponding to the measured current color temperature; C. recording the second color coordinate in a storage unit retrievable by a computer; D. transforming the second color coordinate to a second tristimulus value through a second conversion matrix; E. obtaining a first color coordinate corresponding to an objective color temperature in the standard reference color gamut; F. transforming the first color coordinate to a first tristimulus value through a first conversion matrix; G. obtaining a first output bases of three original color light signals corresponding to the objective color temperature by calculation according to the following equation (a): r 1 /r 2 =R 1 /R 2 ; g 1 /g 2 =G 1 /G 2 ; b 1 /b 2 =B 1/B 2 (a) H. ending process when the second output bases approximate the first output bases within an allowable range, otherwise proceeding the next step; and I. replacing the second output bases by the first output bases and repeating the previous process.