Patent ID: 7136044
Filing Date: 2006-11-14
Classification: G09G

Abstract:
1. A display apparatus comprising: a display panel; coefficient variable driving means for driving the display panel with an amplified video signal that is obtained by multiplying an input video signal by a variable coefficient; operating means for operating, based on a lamp control signal, a lamp for illuminating the display panel; level extension signal calculating means for outputting an optical output level extension signal by extending a predetermined output level used to operate the lamp, wherein the predetermined output level is extended based on an optical output gain obtained from the input video signal, and an output peak value of the lamp; and white peak improving means for receiving the optical output level extension signal, and for outputting a lamp control signal, whose white peak level has been adjusted according to a change in brightness of a scene, to the operating means, and for calculating and outputting a video amplitude gain, which adjusts an amplitude of a video signal, as a coefficient to the gain variable driving means, wherein the lamp control signal is outputted when the brightness of a scene is above normal level, and the video amplitude gain is outputted when the brightness is at normal level.