Projection pad using liquid crystal panel

Details Projection pad using liquid crystal panel Projection pad using liquid crystal panel

1989-12-22

1991-12-31

Shoap, Allan N.

Optics: image projectors

Miscellaneous

353DIG5, 353 61, 353 60, 359 36, G03B 2100

Patent

active

050765434

ABSTRACT:
The present invention concerns a projection pad using a liquid crystal panel in which a transmission type liquid crystal panel is placed between a light source and a screen, and an image displace on the surface of the liquid crystal panel is displayed on a screen. In this type of the projection pad, energy of light projected from the light source is partially converted into heat energy at the inside of the projection pad, which increases the temperature of the projection pad thereby causing disadvantage such as liquefication of liquid crystals, abnormal operation of the panel controlling circuit, etc. It is, accordingly, necessary to provide an appropriate cooling mechanism to the inside of the projection pad. In the present invention, the structure of the cooling mechanism is adapted such that sufficient cooling effect can be obtained by an axial flow blower small in the size and reduced in the thickness thereby enabling to reduce the size and decrease the thickness of the projection pad itself.

REFERENCES:
patent: 4257695 (1981-03-01), Langworthy
patent: 4764981 (1988-08-01), Miyahara et al.
patent: 4825200 (1989-04-01), Evans et al.
patent: 4864647 (1989-09-01), Harrington
patent: 4904079 (1990-02-01), Yoshimura et al.
patent: 4946274 (1990-08-01), Honda
patent: 4950072 (1990-08-01), Honda
patent: 4952925 (1990-08-01), Haastert
patent: 4963001 (1990-10-01), Miyajima
Walter C. Connolly, Apparatus for Teaching Physics, 9/85, pp. 382-385 of The Physics Teacher (DIG. 5).

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