Ferroelectric liquid crystal optical device having temperature c

Details Ferroelectric liquid crystal optical device having temperature c Ferroelectric liquid crystal optical device having temperature c

1989-05-15

1990-02-20

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350333, 350331T, 340784, G02F 1133

Patent

active

049021079

ABSTRACT:
A liquid crystal device, includes: (a) a liquid crystal cell includes a pair of base plates, and a ferroelectric smectic liquid crystal having a negative dielectric anisotropy, (b) a device for applying to the ferroelectric liquid crystal an alternating electric field capable of causing the crystal to assume at least two stable orientation states including a first stable orientation state and a second stable orientation state, (c) a device for changing the frequency or voltage value of the alternating electric field corresponding to a temperature change, (d) a device for selectively applying a first electric field for orienting the ferroelectric liquid crystal to the first stable orientation state and a second electric field for orienting the ferroelectric liquid crystal to the second stable orientation state, and (e) a device for detecting an optical difference between light rays having passed through the ferroelectric liquid crystal oriented to the first orientation state and light rays having passed through the ferroelectric liquid crystal oriented to the second orientation state.

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