Patent ID: 7209108
Filing Date: 2007-04-24
Classification: G09G

Abstract:
1. A differential drive circuit for generating a differential drive signal for driving a liquid crystal device, the differential drive signal having a root mean square value defined by a digital input value and including a first differential component and a second differential component, the circuit comprising: first differential component generating means for counting a clock signal to generate successive values of a periodic count, each of the values including a most-significant bit, and for generating the first differential component of the differential drive signal in response to successive ones of the most-significant bit of the count; second differential component generating means for generating the second differential component of the differential drive signal in response to the digital input value and the successive values of the count, wherein the differential drive signal drives the liquid crystal device, and wherein each of the first differential component and the second differential component has a respective waveform; and at least one of the differential component generating means includes: