Patent ID: 7450099
Filing Date: 2008-11-11
Classification: G09G,H03F

Abstract:
1. A display drive circuit for outputting a gray scale voltage according to display data to a display panel, comprising: a generation circuit which generates gray scale voltages of a plurality of levels; and a selection circuit which selects said gray scale voltage according to said display data, among gray scale voltages having said plurality of levels; said display drive circuit having a mode in which the number of colors to be displayed on said display panel is small, and an other mode in which the number of colors to be displayed on said display panel is large; wherein said generation circuit, in the mode in which the number of colors to be displayed on a display panel is small, decreases a current flowing into an internal circuit which generates a gray scale voltage of an intermediate level other than two gray scale voltages of a gray scale voltage of the most lowest level and a gray scale voltage of the most highest level among the gray scale voltages of said plurality of levels, in comparison to a current flowing in the other mode; and wherein said selection circuit, in the mode in which the number of colors to be displayed on said display panel is small, selects said gray scale voltage according to said display data, from the two gray scale voltages of said most lowest level gray scale voltage and said most highest level gray scale voltage which are generated from said generation circuit.