Patent ID: 7893903

Claim:
A liquid crystal display apparatus comprising: first white color light sources for emitting white light and second coloring light sources for emitting colored light respectively and for independently irradiating the white light and the colored light upon a liquid crystal panel for displaying an image: a detection circuit for detecting a brightness of an input image signal; and an image quality processing calculation circuit for outputting a light source control signal to a light source control signal circuit and an image control to an image control signal circuit in accordance with a detection result from said detection circuit; said light source control signal circuit independent controlling an intensity of said first white color light sources and an intensity of said second coloring light sources; and said image control signal circuit controlling an image to be displayed on said liquid crystal panel; wherein said second coloring light sources include red light sources; wherein said image quality processing calculation circuit outputs said light source control signal for controlling an intensity of said red light sources of second coloring light sources and said image control signal for controlling an image to be displayed on said liquid crystal panel at a same time when an average luminance of the input image signal is detected to be lower than a predetermined luminance and a maximum luminance of the input image signal is detected to be lower than a predetermined luminance; and wherein said image quality processing calculation circuit outputs said light source control signal for reducing an intensity of said first white color light sources and for increasing the intensity of said red light sources of said second color light sources at the same time when the average luminance of the input image signal is detected to be lower than the predetermined luminance and the maximum luminance of the input image signal is detected to be lower than the predetermined luminance.