Patent ID: 6271891
Filing Date: 2001-08-07
Classification: G09G,H04N

Abstract:
A video signal processing circuit comprising:peak level detecting means for detecting peak levels of three primary color video signals of red, green, and blue indicative of video information;inverse gamma correcting circuits for effecting an inverse gamma correction to three primary color input video signals according to said three primary color video signals, respectively; anda level control circuit for controlling a signal level of each of said three primary color input video signals which are supplied to said inverse gamma correcting circuits in accordance with said detected peak levels,wherein when at least one of said peak levels is equal to or larger than a predetermined value, said level control circuit performs a control operation to set a level of each of the three primary color input video signals which are supplied to said inverse gamma correcting circuit to a peak value, and when the peak levels are less than the predetermined value, said level control circuit performs a control operation in which each of the three primary color input video signals which are supplied to said inverse gamma correcting circuit is set to a signal level obtained by multiplying each of the three primary color video signals of red, green, and blue representing said video information by a predetermined coefficient of ""1"" or more.