1985-03-20
1987-09-15
Evans, Arthur G.
350642, H01J 3912
Patent
active
046935584
ABSTRACT:
A rear view mirror assembly comprising a liquid crystal cell of guest-host type which consists of a layer of dichroic dyestuff added nematic liquid crystal and a pair of transparent plates sandwiching the liquid crystal therebetween. A transparent electrode is formed on the inside surface of each plate by means of conductive coating. A quarter wave phase difference filter is mounted on the backside of one of the plates. A flat mirror is mounted on the backside of the quarter wave phase difference filter. A photo-sensitive means receives light passing through the liquid crystal cell and an optical polarization filter in turn and produces a photo-detector signal. A control circuit controls voltage applied to the electrodes of liquid crystal cell so that the magnitude of photo-detector signal may become equal to the predetermined level. The predetermined level is changeable in accordance with the magnitude of detector signal produced by another photo-sensitive means for detecting circumjacent light.
REFERENCES:
patent: 4161653 (1974-07-01), Bedini et al.
Kato Shigeru
Nakaho Jun-ichi
Shibahara Makoto
Evans Arthur G.
Kabushiki Kaisha Tokai Rika Denki Seisakusho
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