Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2011-07-19
2011-07-19
Ngo, Julie-Huyen L (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S177000, C349S178000, C349S189000, C349S181000, C349S186000, C349S194000, C349S201000
Reexamination Certificate
active
07982828
ABSTRACT:
The present invention provides a polarization switching liquid crystal element1having TN liquid crystal7retained between two transparent substrates2aand2bfor transmitting at least visible polarized light with the polarized light transmission axis selectively rotated by 90 degrees when a voltage is selectively applied to the TN liquid crystal7, wherein a phase difference u of said TN liquid crystal7is defined by the following equation: u=2×Δn×d/λ, where Δn is the refractive index anisotropy of said TN liquid crystal7, d is the thickness of said TN liquid crystal7, and λ is the wavelength of said polarized light, and a transmittance T of said polarization switching liquid crystal element measured with polarization plates on the incident and outgoing sides is defined by the following equation: T=(½)×sin2{π(1+u2)1/2/2}/(1+u2), and wherein the phase difference u includes a value 1.7 and the transmittance T is 0.1 or lower when the λ ranges from 400 nm to 700 nm. Then, a polarization switching liquid crystal element having a high response speed and reduced wavelength-dependency can be realized using inexpensive and highly durable TN liquid crystal without increasing parts cost.
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Ngo Julie-Huyen L
Olympus Corporation
Volpe and Koenig P.C.
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