Polarizing plate provided with optical compensation layers and image display apparatus using the same
First Claim
1. A polarizing plate provided with optical compensation layers comprising a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer in the stated order, wherein:
- the first optical compensation layer contains a resin having an absolute value of photoelastic coefficient of 2×
10−
11 m2/N or less, and has a relationship of nx>
ny=nz and an in-plane retardation Re1 of 200 to 300 nm;
the second optical compensation layer contains a resin having an absolute value of photoelastic coefficient of 2×
10−
11 m2/N or less, and has a relationship of nx>
ny=nz and an in-plane retardation Re2 of 90 to 160 nm;
the third optical compensation layer has a relationship of nx=ny>
nz, an in-plane retardation Re3 of 0 to 20 nm, and a thickness direction retardation Rth3 of 30 to 300 nm;
an absorption axis of the polarizer and a slow axis of the first optical compensation layer form an angle of 10°
to 30°
;
the absorption axis of the polarizer and a slow axis of the second optical compensation layer form an angle of 70°
to 95°
; and
the absorption axis of the polarizer and a slow axis of the third optical compensation layer form an angle of 70°
to 95°
.
1 Assignment
0 Petitions
Accused Products
Abstract
To provide a polarizing plate provided with optical compensation layers capable of contributing to thickness reduction, preventing uneven display due to heat, and favorably preventing light leak in black display, and an image display apparatus using the same. The polarizing plate provided with optical compensation layers of the present invention includes a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer in the stated order. The first optical compensation layer, the second optical compensation layer, and the third optical compensation layer each have predetermined absolute value of photoelastic coefficient, refractive index profile, and in-plane retardation and/or thickness direction retardation. An absorption axis of the polarizer and a slow axis of the first optical compensation layer form an angle of 10° to 30°. The absorption axis of the polarizer and a slow axis of the second optical compensation layer form an angle of 70° to 95°. The absorption axis of the polarizer and a slow axis of the third optical compensation layer form an angle of 70°to 95°.
26 Citations
20 Claims
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1. A polarizing plate provided with optical compensation layers comprising a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer in the stated order, wherein:
-
the first optical compensation layer contains a resin having an absolute value of photoelastic coefficient of 2×
10−
11 m2/N or less, and has a relationship of nx>
ny=nz and an in-plane retardation Re1 of 200 to 300 nm;the second optical compensation layer contains a resin having an absolute value of photoelastic coefficient of 2×
10−
11 m2/N or less, and has a relationship of nx>
ny=nz and an in-plane retardation Re2 of 90 to 160 nm;the third optical compensation layer has a relationship of nx=ny>
nz, an in-plane retardation Re3 of 0 to 20 nm, and a thickness direction retardation Rth3 of 30 to 300 nm;an absorption axis of the polarizer and a slow axis of the first optical compensation layer form an angle of 10°
to 30°
;the absorption axis of the polarizer and a slow axis of the second optical compensation layer form an angle of 70°
to 95°
; andthe absorption axis of the polarizer and a slow axis of the third optical compensation layer form an angle of 70°
to 95°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification
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- Resources
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Current AssigneeNitto Denko Corporation
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Original AssigneeNitto Denko Corporation
-
InventorsOkada, Hiroyuki, Shutou, Shunsuke, Chiba, Tsuyoshi, Kitamura, Yoshitsugu
-
Primary Examiner(s)Connelly-Cushwa; M. R.
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Assistant Examiner(s)Peace; Rhonda S
-
Application NumberUS10/580,420Publication NumberTime in Patent Office1,019 DaysField of Search349/117, 349/119US Class Current349/119CPC Class CodesG02B 5/3025 Polarisers, i.e. arrangemen...G02F 1/133528 PolarisersG02F 1/13363 Birefringent elements, e.g....G02F 1/133633 using mesogenic materialsG02F 1/133634 the refractive index Nz per...G02F 2202/40 Materials having a particul...G02F 2413/04 Number of plates greater th...G02F 2413/07 All plates on one side of t...G02F 2413/08 with a particular optical a...
