Patent ID: 8471794
Filing Date: 2013-06-25
Classification: G09G,H03F

Abstract:
1. An apparatus, comprising: a gray scale level output circuit, provided to an output terminal of a gray scale level voltage generating means, wherein the gray scale level output circuit has an operational amplifier for impedance-converting an input signal inputted via the output terminal of the gray scale level voltage generating means, wherein the gray scale level output circuit has a storing means for storing offset voltages generated in the operational amplifier according to a level of a gray scale level voltage of the input signal; and means for controlling the gray scale level output circuit to correct an output of the operational amplifier using the offset voltages stored in the storing means, wherein the storing means comprises a plurality of capacitors for storing the offset voltages; and wherein the means for controlling includes means for selecting one of the plurality of capacitors according to the level of the gray scale level voltage of the input signal, wherein the selecting the one of the plurality of capacitors causes an offset voltage of the operational amplifier stored by the one of the plurality of capacitors to be selected in a first term of one output period.