Patent ID: 7567244
Filing Date: 2009-07-28
Classification: G09G

Abstract:
1. A semiconductor integrated circuit for driving a liquid crystal display including a driver circuit which generates and outputs drive signals which have gray-scale voltages corresponding to image data to be displayed and should be applied to signal lines of an active matrix type liquid crystal panel, said driver circuit comprising: decoder circuits, each of which selects a gray-scale voltage corresponding to the image data; first differential amplifier circuits which perform impedance conversion of positive voltages selected by said decoder circuits; second differential amplifier circuits which perform impedance conversion of negative voltages selected by said decoder circuits; and switch circuits, each of which alternately conducts an output of said each first differential amplifier circuit to one of two adjacent output terminals and an output of said each second differential amplifier circuit to the other one of the two adjacent terminals and vice versa; wherein said first differential amplifier circuits operate on a first supply voltage and a second supply voltage which is lower than the first supply voltage, and wherein said second differential amplifier circuits operate on a third supply voltage which is lower than said first supply voltage and a fourth supply voltage which is lower than the third supply voltage.