Nitto-denko Corporation

Masahiro Hata

Shuuji Yano

Masaki Hayashi

Hiroyuki Okada

Ikuo Kawamoto

Shunsuke Shuto

Kiichi Shimodaira

Tsuyoshi Chiba

Masayuki Kawai

Satoru Kawahara

Naoki Koishi

Ryouji Kinoshita

Nobuyuki Kozonoi

An optical compensation layer-attached polarizing plate including a polarizing plate, an optical compensation layer and another optical compensation layer that are laminated in this order, wherein the optical compensation layer has the relation nx&#x3e;ny=nz, including a resin with a photoelastic coefficient absolute value of at most 2.0&#xd7;10m/N, and has an in-plane retardation (nx&#x2212;ny)din the range of 200 nm to 300 nm, the optical compensation layer has the relation nx&#x3e;ny&#x3e;nz, including a resin with a photoelastic coefficient absolute value of at most 2.0&#xd7;10m/N, and has an in-plane retardation (nx&#x2212;ny)din the range of 90 nm to 160 nm, a slow axis of the optical compensation layer makes an angle of 10&#xb0; to 30&#xb0; with an absorption axis of the polarizing plate, and a slow axis of the optical compensation layer makes an angle of 75&#xb0; to 95&#xb0; with the absorption axis of the polarizing plate.

Optical compensation layer-attached polarizing plate, liquid crystal panel, liquid crystal display, image display, and method for producing optical compensation layer-attached polarizing plate

A retardation film which hardly causes shift or unevenness in retardation values and which has a refractive index profile of nx&#x3e;nz&#x3e;ny (that is, 0&#x3c;Rth[590]/Re[590]&#x3c;1) is provided. A retardation film according to an embodiment of the present invention comprises a stretched polymer film containing a styrene-based resin and a polycarbonate-based resin, which satisfies the following expressions (1) and (2):100 nm&#x2266;Re[590]&#x2266;350 nm&#x2003;&#x2003;(1)0.2&#x2266;Rth[590]/Re[590]&#x2266;0.8&#x2003;&#x2003;(2)

Retardation film and method of producing the same, and optical film, liquid crystal panel, and liquid crystal display apparatus all using the retardation film

An optical film obtained by stretching a polymer film comprising a polycarbonate resin and a styrene resin: wherein a photoelastic coefficient is 2.0&#xd7;10to 6.0&#xd7;10m/N, and a three dimensional refractive index is controlled so that an Nz coefficient may satisfy a relationship of Nz&#x2266;0.9 and a front retardation (Re) may satisfy a relationship of Re&#x2267;80 nm, has characteristics of giving wide viewing angle and also outstanding durability.

Optical film, polarizing optical film, and image viewing display

A laminated optical film comprising an optical film () obtained by stretching a polymer film comprising a polycarbonate resin and a styrene resin, wherein a photoelastic coefficient is 2.0&#xd7;10to 6.0&#xd7;10m/N, and a three dimensional refractive index is controlled, an optical film () showing optically positive uniaxial property that satisfies a relationship of nx&#x3e;ny&#x2245;nz, and an optical film () formed of a material showing optically negative uniaxial property, and the material being tilting aligned, enables inhibition of coloring of display image for observation of a display picture in a diagonal direction to normal line of a screen, and enables display of an image having little gradation inversion areas, and that has outstanding durability.

Laminated optical film, elliptically polarizing plate, and image viewing display

A laminated optical film including an optical film () whose three dimensional refractive index is controlled so that an Nz coefficient represented with Nz=(nx&#x2212;nz)/(nx&#x2212;ny) satisfies a relationship of Nz&#x2266;0.9, when a direction where a refractive index in a film plane gives maximum is defined as X-axis, a direction perpendicular to X-axis as Y-axis, a thickness direction of the film as Z-axis, and refractive indexes in each axial direction are defined as nx, ny, and nz, respectively, and an optical film () that is formed with a material showing optically negative uniaxial property, and being tilting aligned. The laminated optical film may suppress coloring of the display, and may display a picture with few tone reversal regions.

Growing community of inventors

Ibaraki, Japan

Masahiro Hata