Patent ID: 6271813
Filing Date: 2001-08-07
Classification: H04N

Abstract:
A method of controlling the brightness level overall of a screen display having a matrix of screen pixels that each have an individual brightness level controlled by a first and second voltage value, comprising the steps of(A) maintaining the first voltage applied to columns of all of the pixels at a preselected voltage value;(B) determining a current screen display brightness level;(C) determining which one of a plurality of discrete ambient light conditions is currently in effect, wherein each of the plurality of ambient light conditions has a single desired brightness level corresponding thereto;(D) comparing the current brightness level from step (B) with the desired brightness level corresponding to the ambient light condition from step (C); and(E) adjusting the second voltage applied to a row each of pixel to a value corresponding to the desired brightness level from step (D) when the current brightness level does not correspond to the desired brightness level from step (D) to thereby adjust the current brightness level of the screen display so that it corresponds to the desired brightness level.