Projection type display device for monitoring at short distance

Details Projection type display device for monitoring at short distance Projection type display device for monitoring at short distance

1989-06-30

1990-10-09

Cuchlinski, Jr., William A.

Optics: image projectors

Unitary plural refracting surfaces

350127, 350128, 353 74, G03B 2160, G03B 2114

Patent

active

049616420

ABSTRACT:
The present invention relates to a projection type display device wherein images based on light projected form a projection source are formed on a screen. The screen is composed of two Fresnel sheets and one lenticular sheet so that the display device can be monitored at a short distance, more specifically at a short distance within about twice the height of the screen. The light from the projection source is converged at the short distance. The lenticular sheet diffuses the light in the horizontal direction.

REFERENCES:
patent: 3580661 (1971-05-01), Cooper, Jr.
patent: 4531812 (1985-07-01), Oguino
patent: 4536056 (1985-08-01), Ogino
patent: 4701020 (1987-10-01), Bradley, Jr.
patent: 4725134 (1988-02-01), Ogino
patent: 4752116 (1988-06-01), Sekiguchi
patent: 4773731 (1988-09-01), Goldenberg et al.

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