Nitto-denko Corporation

Hitachi, Ltd.

Denko Corporation

Yasuo Fujimura

Akio Mukoh

Hiroyuki Yoshimi

Hisao Yokokura

Teruo Kitamura

Yasuhiko Kando

Noboru Masutani

Isoji Sakai

Seiji Umemoto

Junichi Hirakata

Kazutaka Hara

Takashi Yamaoka

Kazuki Tsuchimoto

Seiichi Kusumoto

Yuuji Saiki

Tatsuki Nagatsuka

Yasuo Imanishi

Chiaki Harada

Suguru Yamamoto

Tatsuya Osuka

Tadao Nakada

Tsunetaka Matsumoto

A transparent protective film for polarizing plate being provided via an adhesive layer on at least one surface of a polarizer, wherein a ratio of constituent elements (oxygen ratio/carbon ratio) on the polarizer-adhering surface of the transparent protective film for polarizing plate, which is determined by X-ray photoelectron spectrometry, is larger than 0.75 has facilitate adhesion surface and no deformation without problems attributable to saponification.

Transparent protective film for polarizing plate, process for producing the same, polarizing plate, and optical film and liquid crystal display using polarizing plate

A wavelength plate which shows little undesirable retardation in a specific wavelength range while substantially maintaining the function of 1/2 wavelength plate or 1/4 wavelength plate over the entire visible light range and a circular polarizing plate which shows little reflection at the interface and exhibits an anti-reflection effect over a wide wavelength range and an excellent thermal stability. A laminated wavelength plate comprising a plurality of oriented films giving a retardation having a wavelength half that of monochromatic light laminated with their optical axes crossing each other, wherein the dependence of the birefringence differences .DELTA.n.sub.1 and .DELTA.n.sub.2 of said oriented films on wavelength each satisfy the relationship .DELTA.n.sub.1 /.DELTA.n.sub.2 &lt;1.05 based on light having wavelength of 400 nm (.DELTA.n.sub.1) and 550 nm (.DELTA.n.sub.2), a laminated wavelength plate comprising a plurality of oriented films laminated with their optical axes crossing each other, the dependence of the birefringence differences .DELTA.n.sub.1 and .DELTA.n.sub.2 of said oriented films on wavelength each satisfying the relationship .DELTA.n.sub.1 /.DELTA.n.sub.2 &lt;1.05 based on light having wavelength of 400 nm (.DELTA.n.sub.1) and 550 nm (.DELTA.n.sub.2), wherein the oriented films used are those giving a retardation of 1/2 wavelength with respect to monochromatic light and those giving a retardation of 1/4 wavelength with respect to monochromatic light in combination, a circular polarizing plate comprising a laminate of the the laminated wavelength plate having a 1/4 wavelength plate and a polarizing plate, and a liquid crystal display comprising the circular polarizing plate.

Laminated wavelength plate, circular polarizing plate and liquid crystal

A process for producing a polymer or a crosslinked article having a region in which the polymerization rate or crosslinking rate is varied is disclosed, comprising irradiating a photopolymerizable substance or photo-crosslinkable substance with laser light having an uneven distribution of intensity. The process is suitable for mass production of polymerization rate- or crosslinking rate-distributed articles. An arbitrary distribution pattern can be designed and formed under good control, and distribution regions having a fine shape can be formed with excellent precision. A plurality of distribution regions having a regular shape can be formed at a high density with high precision.

Process for producing polymerization or crosslinking rate-distributed

A birefringent film in which molecules oriented in a direction parallel to the film plane and molecules oriented in the direction of the thickness of the film are present in a mixed state. Also, a process for producing the birefringent film, which comprises laminating a resin film on one or both sides thereof with a shrinkable film, thereby preparing a laminate, and then heat stretching the laminate, thereby performing stretching treatment of the resin film while imparting to the resin film the ability to shrink in the direction crossing the stretching direction. A retardation film is formed by using at least one birefringent film and has refractive indexes, n.sub.x and n.sub.y, in two directions parallel to the plate plane and crossing each other at right angles and a refractive index, n.sub.z, in the direction of the thickness of the plate, said refractive indexes n.sub.x, n.sub.y, and n.sub.z satisfying the following equation:

Birefringent film with n.sub.x &gt;n.sub.z &gt;n.sub.y, process for producing

A liquid crystal display device comprising: a liquid crystal display element formed by holding, between two substrates at least one of which has a light-permeable electrode, a liquid crystal layer in which liquid crystal molecules of a nematic liquid crystal having positive dielectric anisotropy and containing an optically active substance has a helical axis perpendicular to the substrates between the substrates and are helically oriented, and the liquid crystal molecules between the substrates have a twist angle of 180 to 270 degrees, and a phase plate formed by stacking water surface development films of an organic polymer with changing the orientation axes thereof at a constant angle, wherein the contrast ratio, a ratio between brightness in white display and brightness in black display, is remarkably excellent over that of a device obtained by stacking plastic films, and the transmissivity, a quotient of background brightness and light source brightness, is equivalent to that of a conventional double layer structure liquid crystal display device.

Liquid crystal display device and phase plate therefor

A liquid crystal display cell, wherein orientation films are made of an organic polymer such as polyimide, polyamide, liquid crystal polymer having one or more mesogen groups in a main chain or side chain and produced by spreading an organic polymer solution on a water surface, is excellent in memory properties and contrast and generates no static electricity, no short circuit between electrodes and no breaking of electrodes.

Liquid crystal display cell and process for producing the same

Growing community of inventors

Osaka, Japan

Yasuo Fujimura