G - Physics – 02 – F
Patent
G - Physics
02
F
345/59
G02F 1/13 (2006.01) C09K 19/20 (2006.01) G02F 1/139 (2006.01)
Patent
CA 1096023
FAST TURN-OFF NEMATIC LIQUID OPTICAL DEVICES Abstract of the Disclosure There is disclosed herein a novel nematic liquid crystal optical device of the type wherein the variation of the orientation and the index refraction of the nematic fluid is effected by means of an applied electric field. The device is disposed between crossed polarizers and, in operation, light passing through the device is extinguished when a sufficient voltage is applied to the device to align the bulk of the nematic fluid in the direction of the applied field, the cell being transmissive in the quiescent, parallel aligned state. The device is characterized by relatively fast relaxation times from the driven to the quiescent state, such characterization being imparted to the device by the use as the nematic fluid therein of a nematic material which is operative at room temperature and which has a reversal in sign of its dielectric anisotropy, i.e., a positive-negative dielectric anisotropy material. Such material is one which is constituted of molecules possessing a dipole moment at an angle to the long axis of the molecule, the latter angle depending upon the magnitude of the dipole moment and on the anisotropy of the electron polarizability of the molecule. Examples of such positive-negative anisotropy materials are those represented by the following general structural formula Image wherein R and S are radicals selected from the group consisting of alkyl radicals having 1 to 12 carbon atoms. YO972-106 -1-
199925
International Business Machines Corporation
Kerr Alexander
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