US 2002/0163490 A1 · Liquid crystal display and method for driving the same

Abstract

A liquid crystal display and its driving method are provided which enable a proper gamma correction to be made to each of red, green, and blue colors without causing a decrease in a number of gray levels in an output image and enable lowering in an image quality to be prevented. The liquid crystal display includes a liquid crystal panel in which pixel electrodes for each of the red, green, and blue colors are repeatedly arranged along a scanning line, a scanning line driving circuit to scan in every scanning period, an RGB (Red, Green, and Blue) switching reference gray-scale voltage producing circuit to produce a reference voltage corresponding to a voltage-transmittance characteristic of each color, and a signal line driving circuit to produce a signal voltage and to feed to each signal line.

Claims9

Dependent claims

A liquid crystal display comprising:

a liquid crystal panel in which pixel electrodes for each of red, green, and blue colors are arranged sequentially and repeatedly on a screen along a scanning line on a same row;
a scanning line driving unit to sequentially perform scanning along said scanning line on each row in every scanning period;
a reference gray-scale voltage producing unit to produce a reference gray-scale voltage which corresponds to a voltage transmittance characteristic curve for each of said red, green, and blue colors to be displayed in said liquid crystal panel at every time of scanning along said scanning line for each of said red, green, and blue colors;
and
a signal line driving unit to make a gamma correction to input gray-scale data corresponding to each color by using said reference gray-scale voltage for each of said red, green, and blue colors and to produce a signal voltage and then to feed said produced signal voltage to a signal line on a column corresponding to said pixel electrode for each of said red, green, and blue colors.

2 more elements

A method for driving a liquid crystal display having a liquid crystal panel in which pixel electrodes for each of red, green, and blue colors are arranged sequentially and repeatedly in a manner so as to correspond to each of scanning lines on a same row, said method comprising:

a step of scanning along each of said scanning lines on each row in every scanning period;
a step of producing a reference gray-scale voltage corresponding to a voltage-transmittance characteristic of each of said red, green, and blue colors of said liquid crystal panel at every scanning along said signal line for each of said red, green, and blue colors;
a step of making a gamma correction to input gray-scale data corresponding to each of said red, green, and blue colors by using said reference gray-scale voltage for each of said red, green, and blue colors and producing a signal voltage;
and
a step of feeding said signal voltage to a signal line on each column corresponding to a pixel electrode of each of said red, green, and blue colors in every scanning period.

2 more elements

Dependencies are inferred from the claim text.

Liquid crystal display and method for driving the same

Life of this patent

Liquid crystal display and method for driving the same

Life of this patent

Abstract

Claims9