Patent ID: 9142169
Filing Date: 2015-09-22
Classification: G09G

Abstract:
1. A digital to analog converter (DAC), for a source driver chip of a liquid crystal display (LCD) device, the digital to analog converter comprising: an output terminal, for outputting an output voltage; a plurality of receiving terminals, for receiving a plurality of Gamma voltages; and a plurality of transmission paths, comprising a plurality of first-type transistors coupled between the plurality of receiving terminals and the output terminal, respectively, for outputting one of the plurality of Gamma voltages as the output voltage according to a digital select signal; wherein a first transmission path corresponding to a first receiving terminal receiving a first Gamma voltage closest to a middle voltage among the plurality of Gamma voltages has lower on-resistance than other transmission paths among the plurality of transmission paths; wherein the first Gamma voltage results in the first-type transistor of the first transmission path having a smaller source-to-gate voltage.