Patent ID: 7265795

Claim:
A video signal processing system for a video display apparatus which performs display on the basis of a video signal, the video signal processing system comprising: a gain control module configured to provide a feedback signal based upon maximum luminance level information and average luminance level information of a luminance signal corresponding to the video signal, the feedback signal being used to control a gain of the luminance signal; a correction module configured to apply a gamma correction based upon the average luminance level information to the video signal after the gain of the luminance signal has been controlled by the gain control module; wherein the correction module is configured to perform the gamma correction based on a gamma curve which is set in association with luminance area information to which the average luminance level correspond; wherein: if the average luminance level falls within a low luminance area equal to or below a preset low average luminance level, the correction module is configured to perform the gamma correction based on a low luminance gamma curve in which a ratio of an input amplitude of the luminance signal before the gamma correction and an output amplitude of the luminance signal after the gamma correction is larger than one; if the average luminance level falls within a medium luminance area above the preset low average luminance level and below a preset high average luminance level, the correction module is configured to not perform the gamma correction; and if the average luminance level falls within a high luminance area equal to or above the preset high average luminance level, the correction module is configured to perform the gamma correction based on a high luminance gamma curve in which a ratio of an input amplitude of the luminance signal before the gamma correction and an output amplitude of the luminance signal after the gamma correction is greater than one.