Patent ID: 8314820

Claim:
A method of performing backlight adjustment in an RGBW display system, the method comprising: receiving red, green, and blue sub-pixels of an RGB pixel; utilizing a first equation S = max ⁡ ( R , G , B ) - min ⁡ ( R , G , B ) max ⁡ ( R , G , B ) to generate a color saturation of the RGB pixel, wherein: S is the color saturation of the RGB pixel; R, G, and B are gray levels of the red, green, and blue sub-pixels of the RGB pixel, respectively; Min(R, G, B) is the lowest gray level of the gray levels of the red, green, and blue sub-pixels; and Max(R, G, B) is the highest gray level of the gray levels of the red, green, and blue sub-pixels; utilizing a second equation L = 3 2 - 3 4 ⁢ S and a third equation Gain = 1 L = 4 6 - 3 ⁢ S to generate a gain corresponding to the RGB pixel, wherein: L is luminance of the RGB pixel; and Gain is the gain of the RGB pixel; and adjusting a backlight source according to an average of gains of a plurality of RGB pixels.