Nitto-denko Corporation

Nitto Denko Corporartion

Shunsuke Shutou

Hiroyuki Takemoto

Takehito Fuchida

Minoru Miyatake

Naoki Takahashi

Tsuyoshi Chiba

Akinori Nishimura

Ikuo Kawamoto

Masato Bitou

Kozo Nakamura

Hiroyuki Okada

Yoshitsugu Kitamura

Hironori Motomura

Kazuya Hada

Kazuto Yamagata

Tomohito Takita

Hideyuki Yonezawa

Nobuyuki Kozonoi

Misaki Sabae

Youji Ishihara

There is provided a light diffusing element made of a thin film capable of realizing low back scattering and a high haze. A light diffusing element according to an embodiment of the invention includes: a first region having a first refractive index n; a refractive index modulation region having a substantially spherical shell shape and surrounding the first region; and a second region having a second refractive index n, the second region being positioned on a side of the refractive index modulation region opposite to the first region. The light diffusing element satisfies the following expressions (1) and (2):0.0006&#x2266;&#x394;&#x2003;&#x2003;(1)10&#x2266;(&#x394;)&#x2003;&#x2003;(2).

Light-diffusing element, polarizing plate having light-diffusing element attached thereto, polarizing element, and liquid crystal display device equipped with those components

There is provided an optical laminate which comprises: a polarizing film wherein a thin polarizing layer is laminated on one main surface of a substrate; and an optical element (lens array). The thin polarizing layer has a thickness of 8 &#x3bc;m or less. The substrate has a thickness of 20 &#x3bc;m to 80 &#x3bc;m. The optical element is a pattern retardation plate including a plurality of regions having different slow axis directions.

Optical laminate and liquid crystal display device

A liquid crystal display apparatus according to an embodiment of the invention includes: a liquid crystal cell; polarizing plates placed on both sides of the liquid crystal cell; a light diffusing element provided outside of the polarizing plate on a viewer side; and a backlight unit provided outside of the polarizing plate on an opposite side of the viewer side. The backlight unit includes a collimated light source device that emits collimated light having a brightness half-value angle of 3&#xb0; to 35&#xb0; toward the liquid crystal cell, and a ratio Fw(BL)/Fw(FD) between a diffused light half-value angle Fw(FD) of the light diffusing element and the brightness half-value angle Fw(BL) of the collimated light is 0.5 or less.

Liquid crystal display apparatus

A light diffusing element of the present invention includes: a matrix containing a resin component and an ultrafine particle component; and light diffusing fine particles dispersed in the matrix, wherein refractive indices of the resin component, the ultrafine particle component, and the light diffusing fine particles satisfy the below-indicated expression (1); and the light diffusing element comprises a concentration adjusted area, which is formed in an outer portion of a vicinity of a surface of each of the light diffusing fine particles, and in which a weight concentration of the resin component decreases and a weight concentration of the ultrafine particle component increases with increasing distance from the light diffusing fine particles:||&#x2003;&#x2003;(1)

Light diffusing element, polarizing plate with light diffusing element, liquid crystal display apparatus using both, and manufacturing method for light diffusing element

There is provided a composite polarizing plate used for a liquid crystal display device comprising a liquid crystal cell, a front substrate, and a collimated light source device according to present invention includes a polarizer; and a light diffusion pressure-sensitive adhesion layer placed on a side of the polarizer, wherein when the composite polarizing plate is used for the liquid crystal display device, the light diffusion pressure-sensitive adhesion layer is arranged in contact with the front substrate.

Composite polarizing plate having a light diffusion pressure-sensitive adhesion layer and liquid crystal display device

Provided are a laminated optical film capable of enhancing a contrast ratio in an oblique direction remarkably while enhancing viewing angle characteristics when being used in a liquid crystal display apparatus or the like, and a liquid crystal panel and a liquid crystal display apparatus using the laminated optical film. The laminated optical film of the present invention includes a polarizer, a first optical compensation layer, and a second optical compensation layer in the stated order, in which the first optical compensation layer has a refractive index profile of nx&#x3e;nz&#x3e;ny and is placed so that a slow axis direction thereof is substantially parallel to or substantially perpendicular to an absorption axis direction of the polarizer, and the second optical compensation layer converts linearly polarized light into circularly polarized light or circularly polarized light into linearly polarized light in a visible light region.

Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film

A liquid crystal panel of the present invention includes in the following order toward a viewer side: a first polarizer; a first optical compensation layer having a refractive index ellipsoid of nx&#x3e;ny&#x3e;nz and an in-plane retardation Reof 90 to 300 nm; a liquid crystal cell; a second optical compensation layer having a refractive index ellipsoid of nx&#x3e;ny&#x3e;nz and an in-plane retardation Reof 90 to 300 nm; and a second polarizer, wherein a total thickness direction retardation &#x3a3;Rthof all the optical compensation layers and a thickness direction retardation Rthof the liquid crystal cell satisfy the following Expression (1):&#x2212;160 nm&#x3c;(&#x3a3;)&#x3c;50 nm&#x2003;&#x2003;(1).

Liquid crystal panel and liquid crystal display apparatus using the same

There is provided a liquid crystal panel having excellent balance between contrast and viewing angle characteristics. A liquid crystal panel according to an embodiment of the present invention includes: a first polarizer; a first optical compensation layer containing a resin having an absolute value of photoelastic coefficient of 2&#xd7;10m/N or less, and having a relationship of nx&#x3e;ny=nz; a second optical compensation layer having a relationship of nx=ny&#x3e;nz; a liquid crystal cell; a third optical compensation layer containing a resin having an absolute value of photoelastic coefficient of 2&#xd7;10m/N or less, and having a relationship of nx&#x3e;ny=nz; and a second polarizer, in the stated order forward a viewer side, wherein the sum &#x3a3;Rthof the thickness direction retardation of all the optical compensation layers and the thickness direction retardation Rthof the liquid crystal cell satisfy the following expression (1):&#x2212;50 nm&#x3c;(&#x3a3;)&#x3c;150 nm&#x2003;&#x2003;(1).

There is provide a polarizing plate provided with optical compensation layers capable of performing viewing angle compensation with respect to a liquid crystal cell, providing broadband circular polarization, contributing to thickness reduction, preventing uneven display due to heat, and favorably preventing light leak in black display, and an image display apparatus using the same. The polarizing plate provided with optical compensation layers of the present invention includes a polarizer, a first optical compensation layer, and a second optical compensation layer in the stated order, wherein: the first optical compensation layer contains a resin having an absolute value of photoelastic coefficient of 2&#xd7;10m/N or less, and has a relationship of nx&#x3e;ny=nz and an in-plane retardation Reof 100 to 170 nm; the second optical compensation layer has a relationship of nx=ny&#x3e;nz, an in-plane retardation Reof 0 to 50 nm, and a thickness direction retardation Rthof 30 to 400 nm; and an absorption axis of the polarizer and a slow axis of the first optical compensation layer form an angle of 25&#xb0; to 65&#xb0;.

Polarizing plate provided with optical compensation layers and image display apparatus using the same

A polarizing plate with optical compensation layers that performs a wide viewing angle compensation with respect to a liquid crystal cell, allows circularly polarized light to be obtained over a wide range of light wavelengths, contributes to the reduction in thickness, prevents thermal irregularity from occurring, and can effectively prevent light leakage from occurring in a black display. The polarizing plate includes a polarizer, a first optical compensation layer, and a second optical compensation layer that are stacked together in this order. The first optical compensation layer is formed of a liquid crystal compound and has a relationship of nx&#x3e;ny=nz and an in-plane retardation Reof 100 to 170 nm. The second optical compensation layer has a relationship of nx=ny&#x3e;nz and a thickness direction retardation Rthof 30 to 400 nm. The angle formed between the absorption axis of the polarizer and the slow axis of the first optical compensation layer is in the range of 'plus' or 'minus' 25 to 65 degrees.

Polarizing plate with optical compensation layer, method of producing the same, and liquid crystal panel, liquid crystal display, and image display including the same

To provide a polarizing plate provided with optical compensation layers capable of contributing to thickness reduction, preventing uneven display due to heat, and favorably preventing light leak in black display, and an image display apparatus using the same. The polarizing plate provided with optical compensation layers of the present invention includes a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer in the stated order. The first optical compensation layer, the second optical compensation layer, and the third optical compensation layer each have predetermined absolute value of photoelastic coefficient, refractive index profile, and in-plane retardation and/or thickness direction retardation. An absorption axis of the polarizer and a slow axis of the first optical compensation layer form an angle of 10&#xb0; to 30&#xb0;. The absorption axis of the polarizer and a slow axis of the second optical compensation layer form an angle of 70&#xb0; to 95&#xb0;. The absorption axis of the polarizer and a slow axis of the third optical compensation layer form an angle of 70&#xb0;to 95&#xb0;.

Growing community of inventors

Ibaraki, Japan

Shunsuke Shutou