Patent ID: 9159282
Filing Date: 2015-10-13
Classification: G09G,H03F

Abstract:
1. A method of canceling an offset in a display device comprising: coinciding offset directions of amplifiers through an amplifier-type setting operation, wherein the amplifier-type setting operation is to set an operation of respective ones of the amplifiers to one of a first type and a second type; and canceling offsets of the amplifiers through a chopping operation; wherein the chopping operation comprises a first chopping operation with respect to polarity of an output signal of each of the amplifiers and a second chopping operation with respect to an offset polarity of each of the amplifiers, the amplifier-type setting operation of the respective amplifiers comprises: applying 0V to a first terminal and a second terminal of the respective amplifiers; latching offset data corresponding to a voltage of an output node of the respective amplifiers; wherein the offset data is used as a chopping signal of the respective amplifiers in the amplifier type setting operation, wherein the first type of the respective amplifiers includes the first terminal receiving analog data and the second terminal connected to the output node, wherein the second type of the respective amplifiers includes the second terminal receiving the analog data and the first terminal connected to the output node, wherein the first terminal is a positive input terminal and the second terminal is a negative input terminal for the first type, and wherein the first terminal is a negative input terminal and the second terminal is a positive input terminal for the second type.