Nitto-denko Corporation

Hisae Sugihara

Yutaka Ohmori

Toshiyuki Iida

Takahisa Konishi

Akinori Izaki

Miyuki Kurogi

Shuusaku Nakano

Yutaka Oomori

Amane Mochizuki

Takami Hikita

Michie Sakamoto

The retardation film of the present invention contains a thermoplastic polymer having at least a side chain component (A) oriented in a direction substantially orthogonal to a slow axis, and the absorption edge wavelength (&#x3bb;) of the side chain component (A) is 330 nm or more, and an in-plane retardation value (Re[450]) at a wavelength of 450 nm is smaller than that (Re[650]) at a wavelength of 650 nm. In the above-mentioned retardation film, the difference (&#x394;Re=Re[650]&#x2212;Re[450]) between the in-plane retardation value (Re[650]) at a wavelength of 650 nm and the in-plane retardation value (Re[450]) at a wavelength of 450 nm is preferably 10 nm or more. The retardation film of the present invention exhibits optical characteristics in which the in-plane birefringence is large and the difference between a retardation value on the short wavelength side and a retardation value on the long wavelength side is large.

Retardation film, optical laminated body, liquid crystal panel, and liquid crystal display

An optical film containing a polymer having at least a repeating unit represented by following general formula (I): The optical film is excellent in heat resistance, transparency and processability because it contains a polymer having a naphthyl group in a molecular structure. In addition, when a retardation film is produced by drawing the optical film, a composition ratio of the polymer can be adjusted in a specific range so that the retardation film exhibits inverse wavelength dispersion properties such that higher retardation value is offered in measuring by light with longer wavelength. The retardation film having such properties is extremely useful for improving display properties of a liquid crystal display device. The optical film is also used in the production of a polarizing plate.

Optical film containing polymer having naphtyl group

A liquid crystalline di(meth)acrylate compound represented by the following formula (III): 

Liquid crystalline di(meth) acrylate compound, phase difference film, optical film, polarizing plate, liquid crystal panel and liquid crystal display device

There is provided a liquid crystal panel, in which a color shift in an oblique direction is small even when observed from any azimuth angle of 0&#xb0; to 360&#xb0;, and the viewing angle in the horizontal direction is wide. A liquid crystal panel according to the present invention includes: a liquid crystal cell; a first polarizer placed on one side of the liquid crystal cell; a second polarizer placed on the other side of the liquid crystal cell; and a first optical compensation layer and a second optical compensation layer placed between the first polarizer and the second polarizer, wherein: the first optical compensation layer is placed between the first polarizer and the liquid crystal cell; a slow axis direction of the first optical compensation layer is substantially perpendicular to an absorption axis direction of the first polarizer; the first optical compensation layer has a refractive index profile of nx&#x3e;ny&#x2267;nz; the first optical compensation layer includes a retardation film (A) which contains a polyvinyl acetal-based resin and whose in-plane retardation value (Re[750]) at a wavelength of 750 nm is larger than an in-plane retardation value (Re[550]) at a wavelength of 550 nm; the second optical compensation layer is placed between the first optical compensation layer and the second polarizer; and the second optical compensation layer has a refractive index profile of nx=ny&#x3e;nz.

Liquid crystal panel and liquid crystal display apparatus

There is provided a retardation film including a stretched film of a polymer film having an absolute value of photoelastic coefficient (m/N) of 50&#xd7;10or less measured by using light of a wavelength of 550 nm at 23&#xb0; C., which satisfies the following expressions (1) and (2):Re[450]&#x3c;Re[550]&#x3c;Re[650]&#x2003;&#x2003;(1)Rth[550]&#x3c;Re[550]&#x2003;&#x2003;(2).In the expressions (1) and (2): Re[450], Re[550], and Re[650] respectively represent in-plane retardation values measured by using light of wavelengths of 450 nm, 550 nm, and 650 nm at 23&#xb0; C.; and Rth[550] represents a thickness direction retardation value measured by using light of a wavelength of 550 nm at 23&#xb0; C.

Retardation film, polarizing element, liquid crystal panel, and liquid crystal apparatus

A phase difference film characterized in that said film is obtained by orienting and fixing, on a substrate, a composition containing a polymerizable liquid crystal monomer represented by the following formula (I): 

Liquid crystalline di(meth)acrylate compound, phase difference film, optical film, polarizing plate, liquid crystal panel and liquid crystal display device

The present invention provides a polyimide resin for an electrical insulating material which comprises a polyimide resin having a repeating unit represented by general formula (I): wherein Rrepresents a bivalent organic group.

Growing community of inventors

Ibaraki, Japan

Hisae Sugihara