Sharp Kabushiki Kaisha Corporation

Masayuki Katakami

Makoto Shiomi

Toshihide Tsubata

Mikio Katayama

Mitsuhiro Koden

Shigeaki Mizushima

Mitsuaki Hirata

Akira Tagawa

Takaji Numao

Naofumi Kondo

Hirofumi Katsuse

Hitoshi Takeda

Hiroshi Gouda

The method of driving a liquid crystal display in accordance with one embodiment of the present invention is a method of driving a liquid crystal display whereby a first liquid crystal panels produces a display from a first display signal and the second liquid crystal panel produces a display a second display signal derived from the first display signal, the first and second liquid crystal panels being stacked on top of each other. The luminance of the first liquid crystal panel is extended based on the luminance extension ratio obtained from the gray levels for dots contained in the first display signal and a logical maximum gray level of input image data. The luminance of the second liquid crystal panel which produces a display from the second display signal is lowered by the amount by which luminance is extended on the first liquid crystal panel. A liquid crystal display with high display quality is realized by restraining decrease in saturation which would otherwise become obtrusive when two liquid crystal panels are stacked.

Liquid crystal display device drive method, liquid crystal display device, and television receiver

A liquid crystal display includes a liquid crystal cell including a pair of substrates opposite to each other, each substrate having an electrode film and an orientation control layer thereon, and a ferroelectric liquid crystal filled between the substrates; and a pair of polarizing plates which are provided opposite to each other in the state of 'cross nicol' on both sides of the liquid crystal cell; the ferroelectric liquid crystal being bistable in the liquid crystal cell, the polarizing plates being oriented in such a manner that one of their polarizing directions conforms to one of extinction positions of the ferroelectric liquid crystal under no electric field, the liquid crystal cell being applied with an alternating voltage for changing which has a positive portion which gives an apparent tilt angle from one stable state, and a negative portion which gives an apparent tilt angle relative to the other stable state, resulting in display with gray scale.

Gradation driving method for bistable ferroelectric liquid crystal using

Growing community of inventors

Tsu, Japan

Masayuki Katakami