Optical: systems and elements – Polarization without modulation – Depolarization
Patent
1998-11-05
2000-02-15
Spyrou, Cassandra
Optical: systems and elements
Polarization without modulation
Depolarization
349 5, 359584, G02B 530
Patent
active
060259582
ABSTRACT:
A wavelength plate which shows little undesirable retardation in a specific wavelength range while substantially maintaining the function of 1/2 wavelength plate or 1/4 wavelength plate over the entire visible light range and a circular polarizing plate which shows little reflection at the interface and exhibits an anti-reflection effect over a wide wavelength range and an excellent thermal stability. A laminated wavelength plate comprising a plurality of oriented films giving a retardation having a wavelength half that of monochromatic light laminated with their optical axes crossing each other, wherein the dependence of the birefringence differences .DELTA.n.sub.1 and .DELTA.n.sub.2 of said oriented films on wavelength each satisfy the relationship .DELTA.n.sub.1 /.DELTA.n.sub.2 <1.05 based on light having wavelength of 400 nm (.DELTA.n.sub.1) and 550 nm (.DELTA.n.sub.2), a laminated wavelength plate comprising a plurality of oriented films laminated with their optical axes crossing each other, the dependence of the birefringence differences .DELTA.n.sub.1 and .DELTA.n.sub.2 of said oriented films on wavelength each satisfying the relationship .DELTA.n.sub.1 /.DELTA.n.sub.2 <1.05 based on light having wavelength of 400 nm (.DELTA.n.sub.1) and 550 nm (.DELTA.n.sub.2), wherein the oriented films used are those giving a retardation of 1/2 wavelength with respect to monochromatic light and those giving a retardation of 1/4 wavelength with respect to monochromatic light in combination, a circular polarizing plate comprising a laminate of the the laminated wavelength plate having a 1/4 wavelength plate and a polarizing plate, and a liquid crystal display comprising the circular polarizing plate.
REFERENCES:
patent: 5699188 (1997-12-01), Gilbert et al.
patent: 5875008 (1999-02-01), Takahara et al.
Fujimura Yasuo
Yamaoka Takashi
Yoshimi Hiroyuki
Curtis Craig
Nitto Denko Corporation
Spyrou Cassandra
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