Full-color light valve projection apparatus having internal imag

Details Full-color light valve projection apparatus having internal imag Full-color light valve projection apparatus having internal imag

1991-02-06

1992-12-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

353 38, H04N 931

Patent

active

051702509

ABSTRACT:
A projection apparatus 30 with internal image registration is disclosed herein. The projection apparatus 30 of the present invention includes a light valve arrangement 58, 60, 62 for providing an image beam and an alignment beam, with the alignment beam having a predetermined spatial relationship with the image beam. The image beam is projected onto an external screen 20 by a projection lens 46. The present invention further includes a photodetector assembly 46, 48, 50 for generating a control signal in response to the position of the alignment beam. The image beam is aligned with the projection lens 46 by a light valve control circuit responsive to the control signal.

REFERENCES:
patent: 4085425 (1978-04-01), Hamill
patent: 4432011 (1984-02-01), Lehnert
patent: 4648695 (1987-03-01), Mizutani et al.
patent: 4683467 (1987-01-01), Macaulay et al.
patent: 4818098 (1989-04-01), Kahn et al.
patent: 4983032 (1991-01-01), Van Den Brandt

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