Liquid crystal controlled mirror systems

Details Liquid crystal controlled mirror systems Liquid crystal controlled mirror systems

G - Physics

02

F

88/113

G02F 1/13 (2006.01) B60R 1/08 (2006.01)

Patent

CA 1272899

ABSTRACT OF THE DISCLOSURE A rearview mirror system comprises an electrically controlled optical transmission plate disposed over a reflecting surface. The optical transmission plate is selectively operable to any of a number of different states of opaqueness between a maximum light transmission and a maximum opaqueness. The opaqueness of the optical trans- mission plate is controlled by an electronic circuit which includes two sensors, one for sensing the brightness of incident light from the field of view and the other for sensing ambient light. The control operates to cause the light which is incident on the reflecting surface to be closed loop regulated to a desired degree of brightness which is also correlated with ambient light conditions. A manually operable adjustment is also provided for the observer to set a desired brightness characteristic.

509429

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