Patent ID: 8547405
Filing Date: 2013-10-01
Classification: G09G

Abstract:
1. A gamma voltage generation circuit, comprising: a resistor string, comprising a plurality of resistors connected in series; a first switch, an output terminal of the first switch being coupled to a first end of the resistor string; and a second switch, an output terminal of the second switch being coupled to a second end of the resistor string; wherein the first switch selects and outputs one of a first high reference voltage and a second high reference voltage to the first end of the resistor string according to a control signal, and the second switch selects and outputs one of a first low reference voltage and a second low reference voltage to the second end of the resistor string according to the control signal, the resistor string provides a first set of gamma voltages when the first switch outputs the first high reference voltage to the first end and the second switch outputs the first low reference voltage to the second end, and the resistor string provides a second set of gamma voltages when the first switch outputs the second high reference voltage to the first end and the second switch outputs the second low reference voltage to the second end.