Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-12-01
1992-05-05
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
340805, G02F 1133
Patent
active
051113171
ABSTRACT:
A ferroelectric liquid crystal device has a first state (T.sub.X1) of maximum transmission, a second state (T.sub.X2) of minimum transmission and a value of voltage pulse width (t.sub.S) and voltage pulse height (V.sub.S) sufficient for a switching pulse to switch the cell from the first state (T.sub.X1) to the second state (T.sub.X2) or vice versa. A method of controlling the transmission of electromagnetic radiation through the ferroelectric liquid crystal device comprises the step of applying, for a time period greater than said value of pulse width (t.sub.S), a plurality of consecutive controlling pulses of one polarity. Each controlling pulse is itself of insufficient pulse height and pulse width to switch the cell from the first state (T.sub.X1) to the second state (T.sub.X2) or vice versa.
REFERENCES:
patent: 4508429 (1985-04-01), Nagae et al.
patent: 4591886 (1986-05-01), Umeda et al.
patent: 4701026 (1987-10-01), Yazaki et al.
patent: 4705345 (1987-11-01), Ayliffe et al.
patent: 4725129 (1988-02-01), Kondo et al.
patent: 4770502 (1988-09-01), Kitazima et al.
patent: 4834510 (1989-05-01), Fujita
patent: 4859035 (1989-08-01), Ichinose et al.
patent: 4904064 (1990-02-01), Lagerwall et al.
Japanese Journal of Applied Physics, vol. 27, No. 7, Jul. 1988, pp. 1115-1121, "Influences of Alignment Materials and LC Layer Thickness on AC Field--Stabilization of Phenomena of Ferroelectric Liquid Crystals", by T. Umeda et al.
Japanese Journal of Applied Physics, vol. 27, No. 7, Jul. 1988, pp. 1122-1125, "Physical Properties of Ferroelectric Liquid Crystals and AC Stabilization Effect", by T. Nagata et al.
J. S. Patel--"Room Temperature Switching Behavior of FLCD in Thin Cells", Appl. Phys. Letter--vol. 47--No. 12--Dec. 1985--pp. 1277-1279.
Duong Tai V.
Miller Stanley D.
Thorn Emi plc
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