Switchable polymer-dispersed liquid crystal optical elements

Details Switchable polymer-dispersed liquid crystal optical elements Switchable polymer-dispersed liquid crystal optical elements

2007-09-04

2007-09-04

Lavarias, Arnel (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S003000, C349S201000, C349S202000

Reexamination Certificate

active

11268660

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 communications switches and switchable transmission, and reflection red, green, and blue lenses. The PDLC material 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. 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 forming the hologram. The material is called a holographic polymer-dispersed liquid crystal (H-PDLC).

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