Patent ID: 6831620
Filing Date: 2004-12-14
Classification: G09G

Abstract:
A source driver for supplying a plurality of gray scale voltages for driving each of a plurality of liquid crystal pixels required to be AC-driven, respectively, such that each said pixel displays a target gray scale level corresponding to a data signal supplied thereto, said source driver comprising:a resistance-type voltage division circuit, which is an internal part of said source driver, for generating said plurality of gray scale voltages; wherein (i) said resistance-type voltage division circuit includes a plurality of series connected resistors connected between at least one positive-side (high level) gray scale reference voltage and at least one negative-side (low level) gray scale reference voltage for generating gray scale voltages between each adjacent pair thereof, (ii) the resistors making up said series connected resistors located on said positive-side of said resistance-type voltage division circuit define positive-side (high level) resistance division ratios between them respectively, (iii) the resistors making up said series connected resistors located on said negative-side of said resistance-type voltage division circuit define negative-side (low level) resistance division ratios between them respectively, and (iv) said positive-side (high level) resistance division ratios and said negative-side (low level) resistance division ratios of the resistance-type voltage division circuit are set so as to be asymmetrical with one another depending on level shift characteristics respectively associated with each said target gray scale level generated between each adjacent pair of said series connected resistors.