G - Physics
01
J
345/1, 375/38
G01J 1/42 (2006.01) C09K 19/16 (2006.01) G02B 5/23 (2006.01) G02F 1/135 (2006.01) G02F 1/137 (2006.01)
Patent
CA 1043887
ABSTRACT OF THE DISCLOSURE A method and apparatus are provided for maintaining the conductance of liquid crystalline compositions comprising pure trans-stilbene liquid crystalline materials at a level sufficient to allow dynamic scattering of the composition. Thus, there is provided an electro-optic device including an electro-optic member that comprises a layer of pure liquid crystalline composition between two electrodes. The liquid crystalline is a pure trans-stilbene nematic liquid crystal- line material. A source of ultraviolet radiation that is electrically energizable is positioned to impinge the layer with radiation upon energization. Electrically connect- ed with the member are comparison means for comparing the electrical resistivity of the layer with a predetermined resistivity value and for generating an electrical signal when the layer resistivity is greater than the predetermined resistivity value. Electrically connected with the compari- son means and the energizable source of ultraviolet radiation are energizing means which receive the electrical signal and, upon receipt thereof, energize the source of ultraviolet radiation.
234995
Haas Werner E.l.
Stephany Joseph F.
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