Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-06-11
1992-09-29
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
340784, 359 76, 359 81, 359 87, 359100, G02F 11343, G02F 11339, G02F 113
Patent
active
051518040
ABSTRACT:
A liquid crystal device incorporating ferroelectric liquid crystal medium having smectic layers between two supporting plates provided with electrodes, the smectic layers exhibiting a spread of angles with respect to at least one of the supporting plates, whereby a gradual transmission/voltage characteristic is achieved. The spread of angles can be obtained by any of several techniques, such as subjecting the device to a low frequency electric field, or a local thermal, mechanical, chemical or magnetic treatment.
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Hartmann Wilbert J. A. M.
Luyckx-Smolders Ann M. M.
Stommels Franciscus J.
Verhulst Antonius G. H.
Fox John C.
Miller Stanley D.
Trice Ron
U.S. Philips Corporation
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