Control circuit for rear view mirrors provided with a liquid cry

Details Control circuit for rear view mirrors provided with a liquid cry Control circuit for rear view mirrors provided with a liquid cry

1978-02-24

1979-07-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Combined with diverse-type device

350331, 350332, H01J 3912

Patent

active

041616537

ABSTRACT:
An anti-dazzle rear view mirror incorporates a liquid crystal cell the conductive layers of which are energized by a control voltage in response to light above a threshold intensity impinging on a photoresistor in the control circuit of the cell. A low voltage source, for example a vehicle 12 volt battery, supplies a potential divider which includes the photoresistor, the voltage across which is connected through a logic invertor which controls two logic NAND gates for gating antiphase square wave outputs derived from an oscillator driven from the source to the respective conductive layers of the cell, thereby producing a square-wave voltage across the cell which is double the amplitude of the oscillator output, and decreasing the time taken for the liquid crystal cell to respond to the light intensity change.

REFERENCES:
patent: 3614210 (1971-10-01), Caplan

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