| 摘要 |
PROBLEM TO BE SOLVED: To provide a light diffusion reflection sheet capable of displaying a projected image (or image) with high luminance and high contrast even when external light rays (or diffused external light rays) are made incident thereon. SOLUTION: The reflection screen is provided with the light diffusion reflection sheet 1 composed of reflective plate-like particles 3 dispersed in transparent resin 2, and the plate surface of the plate-like particle 3 is oriented with tilt to the sheet surface at angles of 1 to 45°. The transparent resin is allowed to contain diffusive particles. The tilt angle of the reflective plate-like particle to the sheet surface is allowed to become larger as it comes farther away from the shortest position from an observer and the projector. Regarding the reflection sheet, the reflection efficiency of the projected image is enhanced by using off-axis reflection while preventing the reflection of the diffused external light. Further, interference light does not occur, and a viewing angle is enlarged. The reflection screen may be a laminate composed of a louver sheet having a plurality of transparent areas (light transmissive area) partitioned by a plurality of louvers (dark color area) and the light diffusion reflection sheet. COPYRIGHT: (C)2005,JPO&NCIPI
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