Method and apparatus to minimize lamp flicker and increase...

Details Method and apparatus to minimize lamp flicker and increase... Method and apparatus to minimize lamp flicker and increase...

2005-08-25

2009-08-04

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C349S005000, C353S122000

Reexamination Certificate

active

07570240

ABSTRACT:
A variable retarder is inserted in a polarized light beam. The retardance of the variable retarder is increased when the light beam increases in brightness and is decreased when the light beam decreases in brightness. The amount of increase and/or decrease in retardance is calculated to stabilize the brightness of the light beam. The variable retarder may be used in conjunction with an auto-iris and share a same brightness detector.

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patent: 2005/0248520 (2005-11-01), Feng et al.
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