Patent ID: 7151517
Filing Date: 2006-12-19
Classification: G02F,G09G

Abstract:
1. An apparatus of driving a display device including a plurality of four color pixels, the apparatus comprising: an input unit receiving three color image signals; an image signal modifier converting the three color image signals into four-color image signals; and an output unit outputting the four-color image signals, wherein the image signal modifier (a) compares grays of the input image signals in a set of three color image signals to determine a maximum input gray (Max), a middle input gray (Mid), and a minimum input gray (Min) among the input image signals and to assign an order index to the signal set; (b) gamma-converts the Max, Mid, and Min luminance values into Γ(Max), Γ(Mid), and Γ(Min), respectively, wherein an inverse gamma conversion is indicated by Γ (c) determines a maximum output gray (Max′), a middle output gray (Mid′), a minimum output gray (Min′), and an output white signal (W′) such that (d) generates the four-color image signals from the Max′, Mid′, Min′, and W′ based on the order; and wherein said apparatus drives said display device according to the four-color image signals.