APPARATUS AND METHOD FOR ADJUSTING BRIGHTNESS

PROBLEM TO BE SOLVED: To provide an apparatus and the method thereof which reduce the load for the eye when a user watches programs for a long time, and improve the contrast of the image. SOLUTION: The apparatus is provided for adjusting the brightness of the (i)th image of an input image sequence in a display system. The image sequence includes a plurality of images each of which consists of a plurality of pixels. The apparatus includes a first calculating module for calculating a current brightness ratio, a second calculating module for calculating an averaged brightness ratio, a judging module for outputting one selected from the current brightness ratio or the averaged brightness ratio as an output brightness ratio, a determining module for storing a plurality of brightness ratios and the corresponding gains and for determining the gain corresponding to the output brightness ratio, and an adjusting module for multiplying the gray scale level of each pixel of the (i)th image by the gain corresponding to the outputted brightness ratio respectively, so as to adjust the brightness of the (i)th image. COPYRIGHT: (C)2007,JPO&INPIT