Patent ID: 7309851
Filing Date: 2007-12-18
Classification: G09G,H05B

Abstract:
1. An adjusting brightness apparatus for adjusting an output back light relative to the ith image frame among N image frames of an image sequence inputted to a display system, N being a natural number, i being an integer index ranging from 1 to N, said adjusting brightness apparatus comprising: an optical sensing module for sensing a current environmental light; a memory unit for storing a look-up table in which a plurality of environmental light values, a plurality of brightness ratios, and a plurality of back light adjusting parameters are recorded, each of the environmental light values corresponding to the brightness ratios and the back light adjusting parameters, each of the back light adjusting parameters corresponding to one of the brightness ratios; an image processing module for receiving the current environmental light to calculate a current brightness ratio of the ith image frame, and determining, according to the current environmental light, the current brightness ratio, and the look-up table, the back light adjusting parameter corresponding to the current brightness ratio; and a back light module for receiving the back light adjusting parameter corresponding to the current brightness ratio, and adjusting the output back light relative to the ith image frame in accordance with the back light adjusting parameter corresponding to the current brightness ratio.