Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Reexamination Certificate
2005-04-05
2009-11-17
Allen, Stephone B (Department: 2872)
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
C349S096000
Reexamination Certificate
active
07619818
ABSTRACT:
An elliptically polarizing plate including: a polarizer; and an optical film that includes a laminate of: a retardation film A that includes a cyclic polyolefin resin-containing thermoplastic polymer and has uniaxially-aligned positive refractive-index anisotropy characterized by nx>ny≈nz; and a retardation film B that is fixed to homeotropic alignment and has positive refractive-index anisotropy characterized by nz1>nx1≈ny1, wherein the optical film is laminated on one side of the polarizer in such a manner that a slow axis of the retardation film A is perpendicular to an absorption axis of the polarizer. The elliptically polarizing plate can suppress a reduction in contrast at wide viewing angles when applied to in-plane switching mode active matrix liquid crystal displays, and can be highly effective for improvements against color shift.
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International Search Report of PCT/JP2005/006636, date of mailing Aug. 2, 2005.
Kawai Masayuki
Kinoshita Ryouji
Yano Shuuji
Allen Stephone B
Chapel Derek S
Nitto Denko Corporation
Westerman Hattori Daniels & Adrian LLP
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