Cholesteric liquid crystal mirror with safety features

Details Cholesteric liquid crystal mirror with safety features Cholesteric liquid crystal mirror with safety features

1985-10-11

1986-05-20

Corbin, John K.

350280, 350346, G02F 1133

Patent

active

045897352

ABSTRACT:
The reflectance of a mirror is variable to provide a dipping car mirror. The mirror comprises a liquid crystal cell formed by two transparent slides coated on their inner surfaces with electrodes. The front electrode is transparent while the rear one is a reflector or a separate reflecting surface is provided. Between the slides is a layer 8 to 12 .mu.m thick of a cholesteric liquid crystal material. The slides are surface treated to give a high tilt homogeneous boundary condition, i.e. the liquid crystal molecules at the slide wall incline at a high (20.degree.-75.degree.) tilt to the surface. A control unit applies either a high voltage (10 volts at 1 kHz) or a low voltage (1 to 2 volts at 1 kHz). The high voltage results in the liquid crystal adopting a light transmissive state. In this state light reflects off the rear of the cell. The low voltage state is a scattering state for the liquid crystal material. In the scattering state light reflects off the front slide and is about 1/10 that reflected off the rear electrode. A photocell controls the switching of the cell. With zero voltage across the cell the liquid crystal material adopts a light transmitter state.

REFERENCES:
patent: 3834792 (1974-09-01), Janning
patent: 3862798 (1975-01-01), Hopkins
patent: 4104627 (1978-08-01), Thuler
patent: 4136933 (1979-01-01), Adams et al.
patent: 4146656 (1979-03-01), Kinugawa et al.

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