Patent ID: 7425941
Filing Date: 2008-09-16
Classification: G09G

Abstract:
1. A TFT-LCD source driver for driving L channels of a liquid crystal panel (where L is a positive integer), the TFT-LCD source driver comprising L DACs (digital-to-analog converters) for converting (M+N)-bit different digital signals into analog signals (where M and N are positive integers), the DAC comprising: a coarse gradation voltage generator, configured with 2 a first decoder for selecting two consecutive voltages among the 2 a fine gradation voltage generator, configured with 2 a second decoder for selecting one of the 2 wherein the L DACs share the coarse gradation voltage generator, the first decoder and the fine gradation voltage generator are connected together without a unity gain amp, and a resistance (R where R is a resistance of the coarse gradation voltage generator.