Patent ID: 7643042

Claim:
A display driver for outputting gradation voltages corresponding to gradation data from an external device to pixels, said display driver comprising: a processing module for converting first gradation data from said external device into second gradation data by frame rate control processing; a generator for generating a plurality of gradation voltages having a plurality of levels based on a reference voltage; and a selector for selecting at least one gradation voltage corresponding to said second gradation data from said plurality of gradation voltages generated by said voltage generator; wherein said first gradation data includes multi-bits for each color of red, green and blue; wherein said voltage generator controls a number of output of said gradation voltages; wherein an interval of said gradation levels is uneven; and wherein said voltage generator outputs said plurality of gradation voltages includes a maximum gradation voltage and a minimum gradation voltage when no color of said gradation data is reduces, and always outputs at least the maximum gradation voltage and the minimum gradation voltage and stops outputting at least one of said gradation voltages that is unnecessary for displaying as a result of color reduction, when said color of said gradation data is reduced.