| 摘要 |
<P>PROBLEM TO BE SOLVED: To contribute to energy-saving by providing a screen for a rear projection display, which has a narrow viewing angle, to eliminate the waste of energy due to providing a viewing angle wider than necessary. <P>SOLUTION: A rear projection display 2a comprises a light source (projector) 4 which generates image light, and a screen 6a which is disposed ahead of the light source 4 (nearer to an observer) and receives the image light to focus the light substantially at positions of eyes (both eyes) 12 of the observer located ahead of the screen 6a. The screen 6a comprises a light source-side Fresnel lens 8 for deflecting the image light from the light source 4 into rays parallel with a normal direction of the screen and an observer-side Fresnel lens 10 for focusing the image light emitted from the lens 8, at the eyes 12 of the observer. <P>COPYRIGHT: (C)2013,JPO&INPIT |
