Illuminator and projector

Details Illuminator and projector Illuminator and projector

2006-06-06

2006-06-06

Perkey, W. B. (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S086000, C353S102000, C353S052000, C353S034000, C362S290000, C362S325000, C362S352000, C362S354000, C359S232000, C359S236000, C359S583000, C359S629000, C349S008000, C349S066000, C348S750000, C348S757000, C348S759000, C348S771000

Reexamination Certificate

active

07055966

ABSTRACT:
When a video signal is inputted to a projector (10) through a video input terminal, a luminance peak value of an image of the video signal is detected by an image-analyzing circuit (61) to be outputted to a CPU (71). A gain-adjusting circuit (63) adjusts a luminance signal in the video signal based on a command from the CPU (71). The CPU (71) determines a gain adjustment amount based on the luminance peak value of the image obtained by the image-analyzing circuit (61) and outputs the result to the gain-adjusting circuit (63). For instance, when the luminance peak value (Ip) of the image is 50% of the upper limit (Imax) thereof, a gain-adjusting amount AG is doubled. In this case, an illuminating light volume of a light valve (44a) has to be reduced to 50%, which is achieved by light-attenuation by a light-source lamp (21) and an open/close light shield (23).

REFERENCES:
patent: 4248517 (1981-02-01), Nishikawa
patent: 5502581 (1996-03-01), Sudo et al.
patent: 2001/0015775 (2001-08-01), Yamamoto et al.
patent: 2002/0105621 (2002-08-01), Kurematsu
patent: 2003/0086265 (2003-05-01), Ilsaka et al.
patent: 5-66501 (1993-03-01), None
patent: 2002-23106 (2002-01-01), None

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