Patent ID: 7068283

Claim:
A display controller for providing a luminance value to a display comprising: an original gamma correction mapping table containing entries describing a default luminance value to be provided to said display for a magnitude of a video input signal, said video input signal providing a default pointer to said default luminance values indicative of said magnitude; a transformed gamma correction mapping table containing entries describing transformed luminance values to be provided to said display for said magnitude of said video input signal, said video input signal providing a transformed pointer to said transformed luminance values indicative of said magnitude, a gamma correction transform circuit that receives a new contrast signal and a new brightness signal, tests if the new contrast signal and the new brightness signal are respectively equivalent to a default contrast signal and a default brightness signal wherein: if the new contrast signal is equivalent to the default contrast signal and the brightness signal is equivalent to the default brightness signal, said a gamma correction transform circuit is in communication with said default gamma correction mapping table to designate the default gamma correction mapping table for determining said luminance values for said display, if the new contrast signal is not equivalent to the default contrast signal and/or the brightness signal is not equivalent to the default brightness signal, said gamma correction transform circuit transforms entries of said default gamma correction mapping table as a function of the contrast signal and the brightness signal, wherein said gamma correction transform circuit is in communication with said transformed gamma correction mapping table to store said entries to said transformed gamma correction mapping table.