Optics: image projectors – Reflector
Patent
1995-06-02
1997-09-23
Dowling, William
Optics: image projectors
Reflector
353 94, G03B 2114
Patent
active
056696868
ABSTRACT:
An image projector having a compatibility so as to display an image having screen ratios of 4 to 3 and 16 to 9 includes a plurality of light sources for projecting light, a reflecting mirror portion for reflecting the light projected from the plurality of light sources onto a predetermined direction, a reflecting mirror controller for controlling the position of the reflecting mirror portion according to screen vertical-to-horizontal ratios, and a microcomputer for controlling the reflecting mirror portion and plurality of light sources according to screen vertical-to-horizontal ratios. The image projector can display compatibly an image having screen vertical-to-horizontal ratios of 16 to 9 and 4 to 3. Also, in the case of the screen vertical-to-horizontal ratios of 4 to 3, since two lamps are alternately used, the lamp life can be extended. The screen can be efficiently displayed according to screen vertical-to-horizontal ratios and a picture quality is improved by reducing the brightness difference of screens.
REFERENCES:
patent: 5300966 (1994-04-01), Uehira et al.
patent: 5386252 (1995-01-01), Oku
patent: 5521658 (1996-05-01), Donohoe
Dowling William
LG Electronics Inc.
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