Projection type image display apparatus

Details Projection type image display apparatus Projection type image display apparatus

1990-03-19

1992-07-28

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358165, 315290, 315360, H04N 574

Patent

active

051344912

ABSTRACT:
A projection type image display apparatus uses an optical modulation image display device as a light valve. Notwithstanding the use of a metal vapor discharge lamp which has a long re-starting period of time as a light source, the apparatus can display images instantaneously by igniting the discharge lamp for a prescribed period of time after switching off and then on again a main power source of the apparatus. Also, the projection type image display apparatus does not generate audio noise at the time of starting the discharge lamp. Furthermore, even in case of adding an instantaneous re-ignition circuit, the frequency of use of such instantaneous re-ignition circuit can be suppressed to an utmost extent, and the useless igniting period of time of the discharge lamp can be curtailed.

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"LCD Full-Color Video Projector", Morozumi et al.; SID 86 DIGEST, pp. 375-378.

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