Patent ID: 8514159
Filing Date: 2013-08-20
Classification: G09G

Abstract:
1. A liquid crystal drive device comprising: first and second string resistors impressed with a same reference voltage; a first gradation voltage generating circuit having a plurality of first wirings directly led out from interconnection nodes of the first string resistor thereof; a second gradation voltage generating circuit having a plurality of second wirings led out from interconnection nodes of the second string resistor thereof having a resistance value higher than the first string resistor, each of the second wirings respectively connected to one of a plurality of voltage-follower connected op amplifiers; a DA (Digital-to-Analog) converter to which the first wirings and outputs of the voltage-follower connected op amplifiers are respectively selectively connected as inputs; and an output op amplifier having an input thereof connected to an output of the DA converter, wherein the voltage-follower connected op amplifiers and the DA converter are respectively selectively connected via switches operated by a control signal.