Kuraray Co., Ltd.

Kazuo Funazaki

Ichiro Matsuzaki

Hideki Kobayashi

Osamu Shinji

Katsuhiro Fujita

Yusaku Nomoto

Atsushi Matsumura

Kirihiro Nakano

Toshiyuki Iguchi

Sho Taga

A multilayer plate, comprising a layer composed of a methacrylic resin comprising not less than 90% by mass of a structural unit derived from a methacrylic acid ester such as methyl methacrylate, methacrylic esters of a polycyclic aliphatic hydrocarbon and the like and having a glass transition temperature of 120 to 180&#xb0; C., and a layer composed of a polycarbonate resin.

Multilayer plate

A transmission type screen is disclosed. The transmission type screen comprises a Fresnel lens sheet, a lenticular lens sheet provided with convex black stripes on the light-exit surface, and a diffusion sheet having an uneven surface on one side thereof. In the transmission type screen, the uneven surface of the diffusion sheet is joined to the lenticular lens sheet at the top portions of black stripes.

Transmission type screen

Eliminating occurrence of non-uniform vertical line patterns observable in image display apparatus with its associative projector device having its pixel structure in the horizontal direction. To this end, rear projection image display apparatus includes a screen including a lenticular lens sheet having its light incidence surface on which lenticular lenses ( ) are periodically provided and a light exit surface having a substantially flat surface ( ) at or near the focal position of each lenticular lens ( ) on the light incidence surface. The lenticular lens sheet has a light absorption layer ( ) provided in a region different from the focal position. The apparatus also includes a projector device having a periodical pixel structure for projecting an optical image onto the screen, such as liquid crystal display panels or the like. Optionally, one or more micro-lenticular lenses may be provided on the substantially flat surface, which lenses have a periodical structure in the same direction as that of the lenticular lenses on the light incidence surface, wherein the pitch ranges from 0.03 to 0.1 mm whereas the lens height measures 0.003 to 0.03 mm.

Rear projection image display apparatus including light exit surface configured to reduce noise

Provided is a Fresnel lens sheet having the advantage of reducing unnecessary rays of light that may go out around the center area of the concentrically-configured Fresnel lens of the sheet. When it is combined with a lenticular lens sheet to construct a viewing screen, the screen has the advantage of preventing white spots from appearing around its center area. The Fresnel lens sheet is for screens for rear projection image displays, and is characterized in that the lens pitch in the center area of the concentrically-configured Fresnel lens of the sheet differs from that in the peripheral area thereof, and that the lens pitch in the center area is larger than that in the peripheral area.

Fresnel lens sheet

Eliminating occurrence of non-uniform vertical line patterns observable in image display apparatus with its associative projector device having its pixel structure in the horizontal direction. To this end, rear projection image display apparatus includes a screen including a lenticular lens sheet having its light incidence surface on which lenticular lenses ( ) are periodically provided and a light exit surface having a substantially flat surface ( ) at or near the focal position of each lenticular lens ( ) on the light incidence surface. The lenticular lens sheet has a light absorption layer ( ) provided in a region different from the focal position. The apparatus also includes a projector device having a periodical pixel structure for projecting an optical image onto the screen, such as liquid crystal display panels or the like. Optionally, one or more micro-lenticular lenses may be provided on the substantially flat surface, which lenses have a periodical structure in the same direction as that of the lenticular lenses on the light incidence surface, wherein the pitch ranges from 0.03 to 0.1 mm where as the lens height measures 0.003 to 0.03 mm.

A rear projection type image display device includes a single projection lens, a Fresnel lens sheet, and a lenticular lens sheet 4 having black stripes in an area where when the light entered through the Fresnel lens sheet is transmitted, the outgoing light does not pass. When the angle (deg) of incidence to the lenticular lens sheet 4 is taken to be .theta., the total light transmittance (%) of the lenticular lens sheet to the light with the angle .theta. of incidence is taken to be Tt(.theta.), and the light transmittance loss by a light absorbent contained in the lenticular lens sheet is taken to be .alpha., as shown by (b), (c) in FIG. 4, in the central part of the lenticular lens sheet, if .vertline..theta..vertline.=5, the expression Tt(.theta.)&gt;70.times.(1-.alpha.) is satisfied, and if .vertline..theta..vertline.=20, the expression Tt(.theta.)&lt;50.times.(1-.alpha.) is satisfied.

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Nakajho-machi, Japan

Kazuo Funazaki