Patent ID: 7742057

Claim:
A method of obtaining a new color temperature point on a color display device, the color display device providing red, green and blue light, wherein a brightest temperature point Wn is formed when the red, green, and blue light are all under a brightest state; the method comprising: step A: finding coordinates (x w , y w ) of a brightest color temperature point, wherein the coordinates (x w , y w ) of the brightest color temperature point are the coordinates on a two dimensional chromaticity diagram; step B: providing a target isotemperature line on the two dimensional chromaticity diagram; and step C: calculating coordinates (x wn , y wn ) of a new color temperature point W n wherein: the coordinates (x wn , y wn )of the new color temperature point W n are the coordinates on the two dimensional chromaticity diagram; the new color temperature point W n is substantially on the target isotemperature line; and the new color temperature point W n substantially satisfies a condition in which the color display device has the minimum loss of brightness of the red, green and blue components.