OPTICAL LAMINATE FOR STEREOSCOPIC IMAGE DISPLAY APPARATUS AND STEREOSCOPIC IMAGE DISPLAY APPARATUS
An optical laminate for stereoscopic image display apparatuses and a stereoscopic image display apparatus including the same are disclosed. The optical laminate includes: a negative dispersion retardation layer; and a reflective polarizer and a polarizing plate sequentially formed on at least one surface of the negative dispersion retardation layer. The polarizing plate includes a polarizer and a protective layer formed on at least one surface of the polarizer and satisfies condition (i) or (ii): (i) a protective layer is formed on each of two opposing surfaces of the polarizer, respectively, and each of the protective layers has a thickness of 30 μm or less; and (ii) a protective layer is formed on one surface of the polarizer and the polarizing plate has a thickness of 70 μm or less.
1 what is claimed is:
1 . An optical laminate for stereoscopic image display apparatuses, comprising:
a negative dispersion retardation layer; and
a reflective polarizer and a polarizing plate, sequentially formed on at least one surface of the negative dispersion retardation layer,
wherein the polarizing plate comprises a polarizer and satisfies condition (i) or (ii):
(i) a first protective layer is formed on a first surface of the polarizer and a second protective layer is formed on a second surface of the polarizer, the second surface facing away from the first surface, and each of the first and second protective layers is 30 μm or less in thickness; and
(ii) a single protective layer is formed on the first surface or the second surface of the polarizer, and the polarizing plate is 70 μm or less in thickness.
2 . The optical laminate as claimed in claim 1 , wherein the polarizing plate satisfies condition (i) and comprises the polarizer, the second protective layer formed between the polarizer and the reflective polarizer, and the first protective layer formed on the first surface of the polarizer, the first surface facing away from the reflective polarizer.
3 . The optical laminate as claimed in claim 2 , wherein the polarizing plate is 70 μm or less in thickness.
4 . The optical laminate as claimed in claim 2 , wherein the second protective layer has an in-plane retardation of 5 nm or less at a wavelength of 550 nm.
5 . The optical laminate as claimed in claim 2 , wherein the first protective layer has an in-plane retardation of 10 nm or less at a wavelength of 550 nm.
6 . The optical laminate as claimed in claim 2 , wherein the second protective layer has a lower in-plane retardation at a wavelength of 550 nm than the first protective layer.
7 . The optical laminate as claimed in claim 2 , wherein at least one of the first protective layer or the second protective layer comprises a functional coating layer.
8 . The optical laminate as claimed in claim 1 , wherein the polarizing plate satisfies condition (ii).
9 . The optical laminate as claimed in claim 8 , wherein the single protective layer is 30 μm or less in thickness.
10 . The optical laminate as claimed in claim 8 , wherein the single protective layer has an in-plane retardation of 10 nm or less at a wavelength of 550 nm.
11 . The optical laminate as claimed in claim 1 , wherein the reflective polarizer has a light transmittance of 1% or less in a light reflection direction thereof.
12 . The optical laminate as claimed in claim 1 , wherein the polarizer has a cross transmittance of 0.3% or less.
13 . The optical laminate as claimed in claim 1 , further comprising: a pancake lens formed on a surface of the negative dispersion retardation layer.
14 . The optical laminate as claimed in claim 1 , wherein a light absorption axis of the polarizer is tilted at an angle of 44° to 46° or at an angle of 134° to 136° with respect to a slow axis of the negative dispersion retardation layer.
15 . The optical laminate as claimed in claim 1 , further comprising: a lens on at least one surface of the negative dispersion retardation layer.
16 . A stereoscopic image display apparatus comprising the optical laminate as claimed in claim 1 .
17 . The stereoscopic image display apparatus as claimed in claim 16 , comprising:
a display unit;
a first polarizing plate; and
a pancake lens assembly,
wherein the pancake lens assembly comprises the optical laminate.
18 . The stereoscopic image display apparatus as claimed in claim 17 , further comprising: a second polarizing plate between the first polarizing plate and the pancake lens assembly.