Patent ID: 8384653

Claim:
A system for improving a saturation of a red-green-blue-white (RGBW) image signal, the system comprising: an image signal classifier to determine whether a frame of an RGBW image signal is a saturation improvement target using an image classification parameter based on a luminance and a saturation of the frame, the image signal classifier classifying each frame of the RGBW image signal into an image classification unit using an image classification parameter of each respective frame; a backlight luminance controller to increase a backlight luminance with respect to the frame when the image signal classifier determines the frame to be the saturation improvement target; and a W sub-pixel controller to decrease a luminance of a W sub-pixel of the frame by an amount equal to an amount of increase in the backlight luminance, wherein the image signal classifier calculates an entire average luminance value of the frame, calculates a number of pixels of the frame having a saturation value greater than an intermediate saturation value with respect to the entire frame, and determines the image classification unit for the frame to be the saturation improvement target when: both the calculated entire average luminance value of the frame exceeds a predetermined reference value; and the calculated number of pixels of the frame having a saturation value greater than an intermediate saturation value with respect to the entire frame exceeds a predetermined threshold value.