Direct-vision/projection type liquid-crystal display having ligh

Details Direct-vision/projection type liquid-crystal display having ligh Direct-vision/projection type liquid-crystal display having ligh

1994-11-16

1996-07-16

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 53, 362 27, 362 30, G02F 11335, G02F 11347

Patent

active

055372333

ABSTRACT:
In a display housing, first and Second liquid-crystal panels are disposed in parallel with each other, and a fluorescent lamp is positioned beside both ends of a gap between these panels. Thus, when used for a transmission type display, e.g. an OHP, the first liquid-crystal panel for light shutter is set in a transmission condition to transmit light from a light source for the OHP or the like and to irradiate the second liquid-crystal panel for displaying an image, thereby projecting the image in a magnified size onto a screen or the like. When used for a direct-vision type display, e.g. a monitor for a personal computer or the like, the first liquid-crystal panel is set in a shading condition to effect diffuse reflection of light from the fluorescent lamp by the first liquid-crystal panel and to irradiate the second liquid-crystal panel, thereby providing a direct-vision image.

REFERENCES:
patent: 4714983 (1987-12-01), Lang
patent: 4772885 (1988-09-01), Uchara
patent: 5099343 (1992-03-01), Margerum
patent: 5208687 (1993-05-01), Yoshida
patent: 5247374 (1993-09-01), Tereda
patent: 5317431 (1994-05-01), Yoshida
patent: 5325218 (1994-06-01), Willett
patent: 5341231 (1994-08-01), Yamamoto

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