Method of injecting ferroelectric liquid crystal including multi

Details Method of injecting ferroelectric liquid crystal including multi Method of injecting ferroelectric liquid crystal including multi

1993-05-05

1994-10-11

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 80, G02F 11339

Patent

active

053552369

ABSTRACT:
A ferroelectric liquid crystal is injected into a liquid crystal cell including a pair of substrates each having at least an electrode thereon and disposed with a sealing agent therebetween so as to provide a prescribed gap therein. The liquid crystal is injected while (a) changing a pressure or a pressure and a temperature of an environment of the liquid crystal cell with time so that (i) in an initial stage of injection, the liquid crystal is injected at a suppressed speed, and (ii) in an intermediate stage of injection, the liquid crystal is injected at a controlled speed so that a front end of the liquid crystal injected within the cell progresses at a substantially constant speed, (b) in a final stage of injection, cooling the liquid crystal under a pressure so as to avoid occurrence of a local liquid crystal injection failure due to a difference in thermal expansion coefficient between the liquid crystal and the substrates, and (c) during the pressure-changing step with time, introducing an inert gas into the environment so as to increase the environmental pressure to a pressure exceeding a normal pressure (760 Torr).

REFERENCES:
patent: 4691995 (1987-09-01), Yamazaki et al.
patent: 5024255 (1991-06-01), Watanabe et al.
patent: 5285300 (1994-02-01), Suzuki et al.
Patent Abstracts of Japan, vol. 12, No. 220 63-015,218 (Jun. 23, 1988) (P-720).
Patent Abstracts of Japan, vol. 12, No. 104 62-273,422 (Apr. 6, 1988) (P-685).
Patent Abstracts of Japan, vol. 17, No. 143 4-316,021 (Mar. 23, 1993) (P-1507).

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