OPTICAL DISPLAY APPARATUS
An optical display apparatus includes a liquid crystal panel and a viewer-side polarizing plate stacked on a surface of the liquid crystal panel, and the liquid crystal panel includes a liquid crystal layer having a pre-tilt angle of 2° to 5°, and the viewer-side polarizing plate includes a first retardation layer including a positive A layer, a second retardation layer including a positive C layer, and a polarizer sequentially stacked from the liquid crystal panel, and satisfies Equation 1.
1 . An optical display apparatus comprising: a liquid crystal panel; and a viewer-side polarizing plate stacked on a surface of the liquid crystal panel,
wherein the liquid crystal panel comprises a liquid crystal layer having a pre-tilt angle of 2° to 5°, and
the viewer-side polarizing plate comprises a first retardation layer comprising a positive A layer; a second retardation layer comprising a positive C layer; and a polarizer stacked sequentially from the liquid crystal panel, and satisfies the following
R
e
1
-
205
nm
≥
R
t
h
2
,
Relation
1
where Re1 is an in-plane retardation of the first retardation layer at a wavelength of 550 nm (unit: nm), and Rth2 is an out-of-plane retardation of the second retardation layer at a wavelength of 550 nm (unit: nm).
2 . The optical display apparatus as claimed in claim 1 , wherein Re1−205 nm is in a range from −100 nm to −60 nm.
3 . The optical display apparatus as claimed in claim 1 , wherein the liquid crystal layer or the liquid crystal panel has an in-plane retardation of 330 nm to 380 nm at a wavelength of 550 nm.
4 . The optical display apparatus as claimed in claim 1 , wherein the liquid crystal layer is a liquid crystal layer in a horizontal alignment mode.
5 . The optical display apparatus as claimed in claim 1 , wherein the liquid crystal layer is formed by physical alignment.
6 . The optical display apparatus as claimed in claim 1 , wherein the liquid crystal panel comprises the liquid crystal layer and an alignment layer formed on a surface of the liquid crystal layer and subjected to rubbing treatment.
7 . The optical display apparatus as claimed in claim 1 , wherein the liquid crystal layer has positive birefringence.
8 . The optical display apparatus as claimed in claim 1 , wherein the positive A layer has an in-plane retardation of 100 nm to 160 nm at a wavelength of 550 nm.
9 . The optical display apparatus as claimed in claim 1 , wherein a slow axis of the positive A layer is tilted at an angle of −1° to 1° with respect to a light absorption axis) (0°) of the polarizer.
10 . The optical display apparatus as claimed in claim 1 , wherein the positive A layer has negative wavelength dispersion.
11 . The optical display apparatus as claimed in claim 1 , wherein the positive C layer has an out-of-plane retardation of −140 nm to −10 nm at a wavelength of 550 nm.
12 . The optical display apparatus as claimed in claim 1 , wherein the second retardation layer comprises the positive C layer alone or comprises the positive C layer and a second protective layer stacked on at least one surface of the positive C layer.
13 . The optical display apparatus as claimed in claim 1 , wherein the positive C layer contains at least one of a cellulose ester based compound or a polymer thereof and an aromatic based compound or a polymer thereof.
14 . The optical display apparatus as claimed in claim 1 , wherein the first retardation layer comprises the positive A layer alone, or comprises the positive A layer and a first protective layer stacked on at least one surface of the positive A layer.
15 . The optical display apparatus as claimed in claim 14 , wherein the first protective layer has an in-plane retardation of 10 nm or less at a wavelength of 550 nm.
16 . The optical display apparatus as claimed in claim 1 , wherein only the first retardation layer and the second retardation layer are present as retardation layers between the polarizer and the liquid crystal panel.