Polarizing plate and optical display apparatus comprising the same
Disclosed herein are a polarizing plate and an optical display apparatus including the same. A polarizing plate includes: a polarizer; and a patterned portion including a first resin layer and a second resin layer stacked on at least one surface of the polarizer and having different indexes of refraction, and the first resin layer is a patterned layer including: multiple first optical patterns formed at intervals at an interface with the second resin layer; and one or more second optical patterns formed between each pair of adjacent first optical patterns, and the first optical pattern and the second optical pattern satisfy Relations 1 to 3 set forth herein.
1 . A polarizing plate comprising:
a polarizer; and
a patterned portion comprising a first resin layer and a second resin layer stacked on at least one surface of the polarizer, the first resin layer having a different index of refraction from the second resin layer,
wherein the first resin layer is a patterned layer comprising: multiple first optical patterns formed at intervals at an interface with the second resin layer; and one or more second optical patterns formed between each pair of adjacent first optical patterns,
a first optical pattern of the multiple first optical patterns has two opposite side surfaces each at least comprising a first side surface having a base angle, and
the first optical pattern and a second optical pattern of the one or more second optical patterns satisfy the following Relations 1 to 3:
0.1 μm≤ m 2≤ m 1×0.2, (1)
0.1 μm≤ w 2≤ w 1×0.5, (2)
0.1 μm≤ h 2≤ h 1×0.2, (3)
where m 1 is a minimum width (unit: μm) between the opposite first side surfaces of the first optical pattern,
w 1 is a maximum width (unit: μm) between the opposite first side surfaces of the first optical pattern,
h 1 is a minimum distance (unit: μm) between the minimum width and the maximum width of the first optical pattern,
m 2 is a maximum width (unit: μm) of a second surface formed at a top portion of the second optical pattern,
w 2 is a maximum width (unit: μm) of the second optical pattern, and
h 2 is a maximum height (unit: μm) of the second optical pattern.
2 . The polarizing plate according to claim 1 , wherein the second optical patterns are formed at both sides of the first optical pattern with a space between the second optical pattern and the first optical pattern.
3 . The polarizing plate according to claim 1 , wherein the second optical patterns are formed at one side of the first optical pattern with a space between the second optical pattern and the first optical pattern.
4 . The polarizing plate according to claim 3 , wherein the patterned portion has a region in which there is no second optical pattern formed between a pair of adjacent first optical patterns.
5 . The polarizing plate according to claim 1 , wherein the second optical pattern has a smaller aspect ratio than the first optical pattern.
6 . The polarizing plate according to claim 1 , wherein a difference in aspect ratio between the first optical pattern and the second optical pattern is 0.5 or less.
7 . The polarizing plate according to claim 1 , wherein one or two second optical patterns are formed between each pair of adjacent first optical patterns.
8 . The polarizing plate according to claim 1 , wherein the one or more second optical patterns longitudinally extend to form a stripe pattern.
9 . The polarizing plate according to claim 1 , wherein the one or more second optical patterns have a same maximum height in a longitudinal direction thereof.
10 . The polarizing plate according to claim 1 , wherein the one or more second optical patterns comprise second optical patterns spaced apart from each other.
11 . The polarizing plate according to claim 1 , wherein the patterned portion comprises multiple pattern groups each comprising the first optical pattern and the second optical pattern, and a distance between a pair of adjacent second optical patterns is the same in each pattern group.
12 . The polarizing plate according to claim 1 , wherein the second optical pattern is an embossed optical pattern comprising the second surface and two side surfaces connected to the second surface.
13 . The polarizing plate according to claim 1 , wherein the second optical pattern has a maximum width of 0.1 μm to 5 μm and a maximum height of 0.1 μm to 3.0 μm, and the second surface has a width of 0.1 μm to 2.0 μm.
14 . The polarizing plate according to claim 1 , wherein the first optical patterns longitudinally extend to form a stripe pattern.
15 . The polarizing plate according to claim 1 , wherein the first optical patterns have a same maximum height in a longitudinal direction thereof.
16 . The polarizing plate according to claim 1 , wherein the first optical pattern has a base angle of 60° to 90° and satisfies the following Relation 4:
1 <p/w 1≤10, (4)
where p is a pitch (unit: μm) of the patterned portion.
17 . The polarizing plate according to claim 1 , wherein the first optical pattern is an embossed optical pattern comprising a first surface and two side surfaces connected to the first surface.
18 . The polarizing plate according to claim 1 , wherein the second optical pattern has a same cross-sectional shape as that of the first optical pattern.
19 . The polarizing plate according to claim 1 , wherein a difference in index of refraction between the first resin layer and the second resin layer is 0.5 or less.
20 . An optical display apparatus comprising the polarizing plate according to claim 1 .