Wide viewing angle polarizing plate and liquid crystal display
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Apr 20, 1999
filing date -
Apr 20, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A wide viewing angle polarizing plate has a laminate of a birefringent film having an in-plane average phase difference of from 50 nm to 200 nm made of a transparent resin film having microscopic regions dispersed therein and a polarizing plate. The birefringent film comprises a transparent resin film having microscopic regions dispersed therein and satisfies the relationships .DELTA.n.sup.2.ltoreq.0.03 and .DELTA.n.sup.1 >.DELTA.n.sup.2 supposing that the direction of the axis along which linearly polarized light exhibits the maximum transmission is .DELTA.n.sup.2 direction, the difference in refractive index between microscopic regions in .DELTA.n.sup.2 direction and other portions is .DELTA.n.sup.2, the direction perpendicular to .DELTA.n.sup.2 direction is .DELTA.n.sup.1 direction and the difference in refractive index between microscopic regions in .DELTA.n.sup.1 direction and other portions is .DELTA.n.sup.1, and .DELTA.n.sup.1 direction and the retardation axis of said birefringent film and the transmission axis of said polarizing plate are parallel to each other and a liquid crystal display comprising same.
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