Liquid crystal television projector with automatic focus

Details Liquid crystal television projector with automatic focus Liquid crystal television projector with automatic focus

1992-07-02

1994-01-04

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358250, 353101, H04N 574

Patent

active

052765237

ABSTRACT:
There is disclosed a video projector provided with automatic focusing function. An image is generated on a liquid crystal light valve according to the video signal, and this image is projected through a projection lens system. The aberration between the focal plane of the projection lens system and the projection surface, such as a screen, is detected, and the focal plane is shifted according to thus detected aberration, in such a manner that the focal plane coincides with the projection surface or screen.

REFERENCES:
patent: 3628857 (1971-12-01), Harvey
patent: 4386833 (1983-06-01), Hirose
patent: 4415244 (1983-11-01), Daly et al.
patent: 4494839 (1985-01-01), Brueckner
patent: 4560999 (1985-12-01), Tokuhara
patent: 4988188 (1991-01-01), Ohta
patent: 4989076 (1991-01-01), Owada et al.
patent: 5136397 (1992-08-01), Miyashita et al.

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