Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal diffraction element
Reexamination Certificate
2005-09-27
2005-09-27
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Liquid crystal diffraction element
C349S086000, C359S015000, C430S001000
Reexamination Certificate
active
06950173
ABSTRACT:
Described herein are the materials, mechanisms and procedures for optimizing various performance parameters of HPDLC optical devices in order to meet differing performance requirements. These optimization tailoring techniques include control and independent optimization of switchable HPDLC optical devices to meet the demanding requirements of anticipated applications for, inter alia, the telecommunications and display industries. These techniques include optimization of diffraction efficiency, i.e., index modulation, polarization dependence control, haze, cosmetic quality, control of response and relaxation time, voltage driving for on and off switching, and material uniformity. This control and independent optimization tailors properties of switchable HPDLC optical devices according to the specific requirements of the application of the switchable HPDLC optical device. The invention disclosed herein retains the desirable attributes of the multi-functional acrylate system for forming HPDLC optical devices, but adds new materials to the acrylate system and/or new process control to the recording to optimize performance parameters as may be needed for specific applications. This results in high optical quality switchable holograms with good diffraction efficiency and low, stable switching voltage.
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Siwecki Stephen A.
Sutherland Richard L.
Tondiglia Vince P.
Chowdhury Tarifur R.
Kilpatrick & Stockton LLP
Science Applications International Corporation
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