Optics: image projectors – Lamp control
Reexamination Certificate
2005-03-01
2005-03-01
Nguyen, Judy (Department: 2851)
Optics: image projectors
Lamp control
C353S077000, C353S094000, C353S122000, C362S227000
Reexamination Certificate
active
06860608
ABSTRACT:
A rear projection display is provided which can clearly display a display screen and enable positive recognition of acceptance of operation of a power switch while preventing increases in manufacturing costs and size of the display. A liquid crystal light valve modulates light emitted from a light source lamp to light for displaying a displayed on a screen. An auxiliary lamp higher in a rate of increase in luminance at start of illumination than the source lamp is arranged such that light from the auxiliary lamp can reach a rear surface side of the screen without passing through the liquid crystal light valve. A main control section causes the light source lamp and the auxiliary lamp to both illuminate at power on, and the auxiliary lamp to extinguish before luminance of the source lamp becomes high enough to cause the display screen to be displayed by projection.
REFERENCES:
patent: 5829855 (1998-11-01), Uchiyama
patent: 6467911 (2002-10-01), Ueyama et al.
patent: A 2002-139794 (2002-05-01), None
Koval Melissa J
Nguyen Judy
Oliff & Berridg,e PLC
Seiko Epson Corporation
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