Title:
SWITCHABLE POLYMER-DISPERSED LIQUID CRYSTAL OPTICAL ELEMENTS
Document Type and Number:
WIPO Patent Application WO2001050200
Kind Code:
A3
Abstract:
Transmission and reflection type holograms may be formed utilizing a novel polymer-dispersed liquid crystal "PDLC" material and its unique switching characteristics to form optical elements. Applications for these switchable holograms include communication switches and switchable transmission, and reflection red, green, and blue lenses. The PDLC material (50) of the present invention offers all of the features of holographic photopolymers with the added advantage that the hologram can be switched on and off with the application of an electric field (24). The material is a mixture of a polymerizable monomer and liquid crystal, along with other ingredients, including a photoinitiator dye. Upon irradiation, the liquid crystal separates as a distinct phase of nanometer-size droplets aligned in periodic channels (230a, 230b) forming the hologram. The material is called a holographic polymer-dispersed liquid crystal "H-PDLC".
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Inventors:
SUTHERLAND RICHARD L
HAGAN BILL
KELLY WILLIAM
EPLING BOB
HAGAN BILL
KELLY WILLIAM
EPLING BOB
Application Number:
PCT/US2000/034661
Publication Date:
January 31, 2002
Filing Date:
December 21, 2000
Export Citation:
Assignee:
SCIENCE APPLIC INT CORP (US)
International Classes:
G02F1/1334; G02F1/1333; G02F1/137; G02F1/31; (IPC1-7): G02B5/32
Foreign References:
| US5942157A | 1999-08-24 | |||
| US5937115A | 1999-08-10 | |||
| US5771320A | 1998-06-23 | |||
| US6211976B1 | 2001-04-03 | |||
| US6172778B1 | 2001-01-09 |
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