Patent ID: 7034895
Filing Date: 2006-04-25
Classification: G09G,H04N

Abstract:
1. An image display apparatus which has a light source whose quantity can be controlled, and displays an image based on a video signal externally input after partially passing through or reflecting a light from the light source, comprising: light quantity control means having a predetermined scope of an output level corresponding to a scope of control of light quantity of the light source, and for outputting a reference signal at a level arbitrarily set by a user; level control means for detecting an average brightness of the displayed image according to the video signal, and for controlling a level of the reference signal output from said light quantity control means depending on the detected brightness; and control means for controlling light quantity of the light source according to the signal controlled by said level control means; wherein said level control means lowers the level of the reference signal when the detected brightness is low; wherein said external video signal is input in a frame or field unit; and said level control means comprises;