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US 7,009,670 B1Granted
Achromatic quarter-wave films
AssigneeResearch Foundation of the University of Central Florida
InventorsYuhua Huang, Thomas X. Wu, Shin-Tson Wu
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Abstract
The achromatic quarter-wave film of this invention has a laminated twisted nematic liquid crystal film sandwiched between two uniaxial polymer films to provide a optical component which converts linearly polarized light into circularly polarized radiation which upon reflection back through said optical component is blocked from outward radiation by the polarizer for the initial incident wide spectrum light thus realizing wider broadband width for full color flat panel displays.
Claims12
A quarter-wave plate device comprising:
- (a) a first and a second uniaxial polymeric films;
- and
- (b) a twisted nematic-liquid crystal (TN-LC) polymeric film sandwiched between the first and second uniaxial polymeric films to form the quarter-wave plate device with a broadband spectrum.
A broadband circular polarizer comprising:
- a first and second uniaxial polymeric film;
- a twisted nematic-liquid crystal (TN-LC) polymeric film sandwiched between said first and second uniaxial polymeric film;
- and
- a linear polarizer laminated on an exterior surface of one of the first and the second uniaxial polymeric films to form said broadband circular polarizer.
1 more element
Dependencies are inferred from the claim text.