Patent ID: 7088324
Filing Date: 2006-08-08
Classification: G09G

Abstract:
1. A liquid crystal display driver for applying a voltage to liquid crystal cells forming an image display area, comprising: a pulse generation circuit for generating a plurality of reference pulses in which pulse generation densities are weighted; a pulse select/synthesis circuit for generating a pulse string by selecting and synthesizing necessary reference pulses on the basis of digital input data and said reference pulses, wherein said pulse generation circuit generates said reference pulses without changing a number of switching times per time unit for a predetermined range of said digital input data around a medium value, wherein said pulse strings comprise a frequency characteristic having a trapezoidal shape corresponding to said digital input data; an integration circuit for integrating the pulse string generated by said pulse select/synthesis circuit to output a voltage for gamma correction, wherein said pulse select/synthesis circuit outputs a logical sum between a carry output from an adder circuit, which has as its inputs high order W bits of the digital input data of n bits and low order W bits of a binary counter, and a logical product between outputs X(m−1) through X( wherein if said digital input data is n bits, then said pulse generation circuit outputs the reference pulses using an n-bit binary counter, an n−1 bit latch, and n−1 2-input gates.