Patent ID: 6654028
Filing Date: 2003-11-25
Classification: G09G,H04N

Abstract:
A display device including a separating circuit for separating a video signal inputted in the form of an analog signal to provide a luminance signal and color-difference signals or video signal input terminals to which said luminance signal and said color-difference signals are supplied separately, a converting circuit for converting said luminance signal and said color difference signals into three primary color signals, and an A/D converting means for converting said three primary color signals in the form of analog signals to digital signals, comprising;a measuring means for measuring an average luminance level of said luminance signal supplied from said separating circuit or video signal input terminal wherein said measuring means comprises a comparing circuit for comparing said generated analog luminance signal with a predetermined level, an integrating circuit, for integrating an output from said comparing circuit and a control circuit for generating an output control signal based on an integrated value from said integrating circuit; and a gamma correction means having a gamma correction curved controlled by said output control signal from said measuring means and provided with respect to the luminance signal from said separating circuit or said video signal input terminal, and said gamma correction means is feedback-controlled by the output control signal from said measuring means.