International Business Machines Corporation

Hideo Takano

Yukito Saitoh

Kang-Wook Lee

Shui-Chih Alan Lien

Shunji Suzuki

Kenichi Tajima

Masaki Hasegawa

Hiroyuki Kamiya

Mitsuru Ikezaki

Toshihiko Koseki

Tetsuya Fukunaga

Hidemine Yamanaka

Atsushi Takenaka

Mayumi Teruya

An alignment-film in which the pretilt angle is changed by ultraviolet irradiation, a material for forming the same, a liquid crystal display device using the alignment film, a method for producing an alignment-film formation material, and a method for producing an alignment film. Ultraviolet irradiation causes large changes in pretilt angle but few changes in electrical characteristics, and a liquid crystal display device free from deterioration of the liquid crystal, image sticking, or the occurrence of flicker results. A first polymer forms the underlying principal layer and a second polymer forms thereon a surface layer thinner than the principal layer. The first polymer may exhibit a small change in electrical characteristics due to ultraviolet radiation and the second polymer may exhibit a large change in pretilt angle due to ultraviolet radiation.

Alignment film, a method for producing the alignment film and a liquid

A soluble polyimide solution is applied to the color filter substrate and the TFT substrate of a liquid crystal display. The lower half of the pixels in the color filter substrate and the upper half of the pixels in the TFT substrate are dried by heating by irradiating it with a laser beam. The remaining sections are thereafter dried naturally. The pretilt angle of the molecules of the liquid crystal material in contact with the sections dried by heating with the laser beam is small and the pretilt angle of the molecules which are in contact with the section dried naturally is large, enabling the viewing angle to be widened.

Method for manufacturing liquid crystal displays

A liquid crystal display apparatus in normally-white mode in which gray scale display is obtained by providing different applied voltages corresponding to different gray scale levels, respectively, characterized in that in a curve showing the relationship between the applied voltage and light transmittance, the lowest applied voltage is set so as to be shifted in the direction of a monotonically decreasing region of the curve. The display simultaneously provides both good contrast ratios and good gradation at large viewing angles, and gray scale is not inverted.

LCD apparatus with improved gray scale at large viewing angles and

In a liquid crystal display device including a first transparent insulating substrate having a common electode formed theron; a second transparent insulating substrate having gate lines formed in a first direction; data lines formed in a second direction so as to intersect said gate lines, liquid crystal display cells, each at a crosspoint of said gate and data lines; the cells having a thin film transistor and a display electrode; a light shielding layer having an aperture for exposing a display area of each display electrode; a liquid crystal material retained between said first and second substrates, and a liquid crystal orientating layer on at least one of the substrates, the improvement comprising, the light shielding layer at an edge of said aperture being located in an up stream direction with respect to a rubbing direction of the orientating layer of the substrate, comprising a thin light shielding layer formed at a periphery of the display electrode for defining an edge of the aperture, and a thick light shielding layer having an edge positioned on the thin light shielding layer.

Active matrix liquid crystal display device having two light shielding

A liquid crystal display and a method for producing the same. The display has a liquid crystal panel including a plurality of pixels, wherein the pixels have electrodes for applying a voltage thereto. A layer of a liquid crystal material is disposed between the electrodes. The pixels are configured so that a single tilt domain of the liquid crystal material exists when a voltage is not applied to the electrodes, and a first tilt domain and a second tilt domain of the liquid crystal material exist when a sufficient voltage is applied to said electrodes. This is achieved by using either a chiral dopant in twisted nematic liquid crystal material, or orientation layers producing a twist of less than 90.degree., or both. The contrast is very symmetrical for up/down viewing angles.

Liquid crystal display

Growing community of inventors

Atsugi, Japan

Hideo Takano