US 2002/0118184 A1 · Gray voltage generation circuit for driving a liquid crystal display rapidly

Abstract

A gray voltage generation circuit for driving a liquid crystal display rapidly outputs an altered gray voltage so that a source driving circuit can charge liquid crystal capacitors constructed in a liquid crystal panel in a short period of time. In response to the gray voltages from the gray voltage generation circuit, while driving a positive polarity, the source driving circuit generates a liquid crystal driving voltage of higher level than the existing liquid crystal driving voltage when applying a gate clock signal of high level, and generates a liquid crystal driving voltage of a level similar to the existing liquid crystal driving voltage when applying a gate clock signal of low level. And, while driving a negative polarity, the source driving circuit generates a liquid crystal driving voltage of lower level than an existing liquid crystal driving voltage when applying a gate clock signal of high level, and generates a liquid crystal driving voltage of a level similar to the existing liquid crystal driving voltage when applying a gate clock signal of low level.

Claims23

Dependent claims

A rapidly driving liquid crystal display, comprising:

a liquid crystal panel having a plurality of pixels;
a timing control circuit for issuing a gate clock signal and a plurality of control signals;
a gray voltage generation circuit for generating a plurality of gray voltages corresponding to data to be displayed in the panel in response to the gate clock signal;
a gate driving circuit for sequentially scanning the pixels of the panel row by row in response to the gate clock signal;
and
a source driving circuit for generating a liquid crystal driving voltage corresponding to data in response to the gray voltage and the control signals, and for applying the generated liquid crystal driving voltage to the panel each of scanning,
wherein the source driving circuit generates a liquid crystal voltage having different values in high and low level intervals of the gate clock signal in response to the gray voltage.

4 more elements

A gray voltage generation circuit for a rapidly driving liquid crystal display comprising a liquid crystal panel having a plurality of pixels;

a timing control circuit for generating a gate clock signal and a plurality of control signals;
a gate driving circuit for sequentially scanning the pixels of the liquid crystal panel row by row in response to the gate clock signal;
and a source driving circuit for generating a liquid crystal driving circuit corresponding to the data in response to a gray voltage and the control signals, and for applying the liquid crystal driving voltage to the panel each of scanning, said gray voltage generation circuit comprising:
a clock generator for generating a plurality of clock signals having a same period as the gate clock signal, in response to the gate clock signal;
a voltage generator for issuing a power supply voltage of the source driving circuit to a predetermined ratio to generate a plurality of voltages to be a reference for the gray voltage;
and
a gray voltage generator for generating a plurality of gray voltages to the source driving circuit in response to the gate clock signals generated from said clock generator and the voltages generated from said voltage generator.

4 more elements

Dependencies are inferred from the claim text.

Gray voltage generation circuit for driving a liquid crystal display rapidly

Life of this patent

Gray voltage generation circuit for driving a liquid crystal display rapidly

Life of this patent

Abstract

Claims23