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4. 发明公开

EP1784688A1 REAR PROJECTION SCREEN 有权
标题翻译：后方投影屏幕
公开(公告)号：EP1784688A1
公开(公告)日：2007-05-16
申请号：EP05781224.0
申请日：2005-08-31
申请人： LG Chemical Co., Ltd. , Insideoptics Co., Ltd.
发明人： YOON, Kyung-Joon, 103-1305, Seawon2cha APT. , KIM, Han-Pil, 103ho, 2580 , LEE, Geun-Hee, 101-1205, Daewon APT., 1511 , KIM, Wook, 302, Hyosinvilla, 682-1 , BYUN, Seok-Joo, 809-2202, Hyundaidaewoo APT.
IPC分类号： G03B21/62
CPC分类号： G03B21/625
摘要： The present invention relates to a rear projection screen (1) for allowing an observer to view an image at a front side by receiving light projected at a rear side. The rear projection screen comprises a transparent plate (3); an optical sheet (8; 8') which is hot-pressed on a rear surface of the transparent plate (3) and includes a plurality of fine prisms (5; 5') formed from side to side and parallel to one another to refract the light and guide the refracted light to the front side, each fine prism protruding to the rear side; a diffusion film (20) which is bonded to a front surface of the transparent plate (3) and including a transparent film (2) and diffusion layers (6) formed on front and rear surfaces of the transparent film to omni directionally disperse and diffuse the light refracted through the optical sheet (8; 8'); and light-shielding printed layers (4) which are formed on an upper surface of the diffusion layer (6) to be horizontally parallel to one another and face portions between the fine prisms (5; 5') of the optical sheet (8; 8'). According to the rear projection screen of the present invention so configured, there is no reflected image on a surface on the side of an observer even under a bright environment such as the presence of sunlight, and a extremely precise color image with a high black level can be obtained. Further, a large-sized screen with less light loss can be manufactured at a low cost by first refracting light emitted from a projector through a fine prism optical sheet and then diffusing the refracted light.
摘要翻译：本发明涉及一种背投屏幕（1），用于通过接收在后侧投射的光而使观察者在前侧观看图像。背投屏幕包括透明板（3）; 在透明板（3）的后表面上热压的光学片（8; 8'），并包括多个从一侧到另一侧并且彼此平行形成的精细棱镜（5; 5'），以折射光线并将折射光导向前侧，每个精细棱镜向后侧突出; 与透明板（3）的前表面接合并且包括透明膜（2）和形成在透明膜的前表面和后表面上的扩散层（6）以全向地分散和扩散的扩散膜（20）通过光学片（8; 8'）折射的光; 以及形成在所述扩散层（6）的上表面上以彼此水平平行并且所述光学片（8; 8）的所述精细棱镜（5; 5'）之间的面部分形成的遮光印刷层（4）。 8' ）。根据这样构成的本发明的背面投影型屏幕，即使在太阳光存在等明亮的环境下，观察者侧的表面也不存在反射像，黑色度高的极其精确的彩色图像可以获得。此外，通过首先通过精细棱镜光学片折射从投影仪发出的光，然后漫射折射光，可以以低成本制造光损失较少的大尺寸屏幕。

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