Liquid crystal optical element with liquid crystal in polymer ma

Details Liquid crystal optical element with liquid crystal in polymer ma Liquid crystal optical element with liquid crystal in polymer ma

1992-04-17

1993-08-10

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 51, G02F 113

Patent

active

052354458

ABSTRACT:
A liquid crystal optical element comprises a pair of substrates with electrodes and a liquid crystal and polymer composite material, which is interposed between the pair of substrates, in which liquid crystal is dispersed and held in a polymer matrix so that the refractive index of the polymer matrix substantially coincides with the refractive index of the liquid crystal used in either state of applying a voltage or without applying voltage, and the refractive indices don't coincide with each other in the other state, wherein the elastic modulus of the polymer material which forms the polymer matrix is 3.times.10.sup.7 N/m.sup.2 or less at 20.degree. C. and 1.times.10.sup.3 N/m.sup.2 or more at 40.degree. C.

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patent: 4728547 (1988-03-01), Vaz et al.
patent: 4834509 (1989-05-01), Gunjima et al.
patent: 4890902 (1990-01-01), Doane et al.
patent: 5103327 (1992-04-01), Hirai et al.
patent: 5150232 (1992-09-01), Gunjima et al.

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