Patent ID: 9019321
Filing Date: 2015-04-28
Classification: G09G

Abstract:
1. A gradation voltage generator, comprising: a first reference voltage selector to select a highest reference voltage, a second highest reference voltage, a lowest reference voltage, and a second lowest reference voltage, from among a plurality of first voltages between a first power voltage and a second power voltage; a second reference voltage selector to receive the highest reference voltage and the lowest reference voltage, and to select and output a first gradation voltage and an N a gamma voltage selector to receive the second highest reference voltage and the second lowest reference voltage and to generate a plurality of gamma voltages independently from the first gradation voltage and the N a gradation distributor to receive the plurality of gamma voltages and to generate second through N−1 the first gradation voltage and the N the gamma voltage selector includes a gamma distributor, and the first gradation voltage and the N wherein the first reference voltage selector includes: a power distributor, which connects the first power voltage and the second power voltage and generates the plurality of first voltages; a first voltage selector, which selects one of the plurality of first voltages according to a first control signal and outputs a first selected voltage as the highest reference voltage; a second voltage selector, which selects one of the plurality of first voltages according to the first control signal and outputs a second selected voltage as the second highest reference voltage; a third voltage selector, which selects one of the plurality of first voltages according to a second control signal and outputs a third selected voltage as the lowest reference voltage; and a fourth voltage selector, which selects one of the plurality of first voltages according to the second control signal and outputs a fourth selected voltage as the second lowest reference voltage.