Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-09-28
1992-06-30
Heyman, John S.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 79, 359100, G02F 1133
Patent
active
051268671
ABSTRACT:
A liquid crystal device is formed by disposing a chiral smectic liquid crystal between two groups of electrodes which are disposed opposite to each other and so as to intersect each other. At least one of the two groups of electrodes is covered by an insulating film and an alignment film which are selected and disposed to provide a combined electrostatic capacitance C (nF) and a combined resistance R (.OMEGA.) satisfying a relationship with the spontaneous polarization Ps of the chiral smectic liquid crystal represented by the following formula: 3.gtoreq.-CR[-2.3+ln(C/Ps)]. As a result, there is provided a chiral smectic liquid crystal device which suppress the persistence to a tolerable level while retaining a good switching characteristic.
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Canon Kabushiki Kaisha
Duong Tai V.
Heyman John S.
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