Elliptically polarizing plate and image display

Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers

Reexamination Certificate

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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.

REFERENCES:
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patent: 2004/0125291 (2004-07-01), Kawahara et al.
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Office Action of Corresponding Chinese Patent Application No. 200580011692.9 issued Sep. 21, 2007.
International Search Report of PCT/JP2005/006636, date of mailing Aug. 2, 2005.

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