Dai Nippon Printing Co., Ltd.

Keiko Kitano

Eiji Asano

Hiroshi Kojima

Takashi Kuroda

Kazuki Matsumoto

Daijiro Kodama

Akinobu Ushiyama

Katsunori Shintani

Mitsuru Inoue

Daijirou Kodama

A light guide plate having light-emitting-side unit optical shapes arranged on a light emitting surface in a direction perpendicular to a light guide direction and a thickness direction of the light guide plate. The optical shape extends in the light guide direction and has a groove shape recessed in the light emitting surface, and a bottom of the groove is formed on a surface which is concave toward the back surface side. Inclined surfaces which are inclined from an edge portion toward the bottom side are formed in two end portions of the concave surface in an arrangement direction. When a width of the optical shape in the arrangement direction is W, a maximum inclination angle &#x3b8; of the inclined surface relative to the light emitting surface satisfies 20&#xb0;&#x2266;&#x3b8;&#x2266;45&#xb0;, and a radius of curvature r of the concave surface satisfies r&#x2267;W/(4&#xd7;sin &#x3b8;).

Light guide plate, surface light source device, transmissive display device

An optical sheet including a body portion, unit optical elements arranged on one surface of the body portion, and an uneven coating having an uneven surface with micro-protrusions, provided on the other surface of the body portion. When the hardness He of the optical element surface Pe and the hardness Hm of the uneven coating surface Pm are evaluated in terms of the pencil hardness measured in accordance with JIS K5600-5-4 (1999) (load: 1000 g; speed: 1 mm/s), the hardness Hm is not less than the hardness He (hardness Hm&#x2267;hardness He) and the hardness Hm is preferably not less than F. Further, the hardness He and the hardness Hm preferably satisfy the following relation:hardness+3&#x2267;hardness&#x2267;hardness2

Optical sheet, optical member, surface light source device, and liquid crystal display device

There is provided a protective film to be bonded to a polarizer to form a lower polarizing plate for a liquid crystal display panel. The protective film for a lower polarizing plate includes a matrix of a resin material and a diffusing component dispersed in the matrix. At least one-side surface, which is to face the polarizer, of the protective film is flat.

Protective film, lower polarizing plate, liquid crystal display panel, display device, and method for producing protective film

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Musashino, Japan

Keiko Kitano