Patent ID: 8217870
Filing Date: 2012-07-10
Classification: G09G

Abstract:
1. An apparatus that generates gradation voltages, comprising: a maximum/minimum selection unit configured to output a voltage corresponding to a maximum selection signal as a maximum reference voltage and a voltage corresponding to a minimum selection signal as a minimum reference voltage, from a distribution of voltages ranging from a first source voltage to a second source voltage, wherein the maximum reference voltage is chosen from the first source voltage to a middle voltage of the voltage distribution and the minimum reference voltage is chosen from the middle voltage to the second source voltage of the voltage distribution; a first selector configured to output the maximum reference voltage or the minimum reference voltage as a 1 a second selector configured to output the minimum reference voltage or the maximum reference voltage as an N wherein when the logic level of the inversion control signal is at a first level, the first selector outputs the maximum reference voltage as the 1 a gamma control unit configured to: