Polarizing plate and optical display apparatus comprising the same
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and a pattern layer stacked on a light exit surface of the polarizer, and the pattern layer includes a second resin layer and a first resin layer sequentially stacked from the polarizer; a first patterned portion including a plurality of first optical patterns is formed at an interface between the first resin layer and the second resin layer; and a second patterned portion including a plurality of second optical patterns is formed on a lower surface of the second resin layer, the first optical patterns and the second optical patterns satisfying Relations 1 and 2.
1. A polarizing plate comprising: a polarizer; and a pattern layer stacked on a light exit surface of the polarizer, wherein:
the pattern layer comprises a second resin layer and a first resin layer sequentially stacked from the polarizer;
a first patterned portion comprising a plurality of first optical patterns is formed at an interface between the first resin layer and the second resin layer, each of the plurality of first opitcal patterns comprising a convex pattern protruding from the second resin layer toward the first resin layer;
a second patterned portion comprising a plurality of second optical patterns is formed on a lower surface of the second resin layer, each of the plurality of second optical patterns comprising an embossed pattern protruding from the second resin layer toward the polarizer; and
the first optical patterns and the second optical patterns satisfy the following Relations 1 and 2:
0 μm <W 1≤15 μm; [Relation 1]
0 μm <W 2≤( W 1×3), [Relation 2]
where W1 is a maximum width (unit: μm) of the first optical pattern, and W2 is a maximum width (unit: μm) of the second optical pattern, the maximum width of the second optical pattern being greater than the maximum width of the first optical pattern.
2. The polarizing plate according to claim 1 , wherein each of the first optical patterns comprises an engraved pattern, has a base angle of 70° to 90°, and satisfies the following Relation 3:
1 <P 1 /W 1≤10, [Relation 3]
where P1 is a cycle (unit: μm) of the first patterned portion.
3. The polarizing plate according to claim 2 , wherein filling patterns filling at least part of the first optical pattern are formed on an upper surface of the second resin layer.
4. The polarizing plate according to claim 1 , wherein the first patterned portion comprises a separation surface between two adjacent first optical patterns of the plurality of first optical patterns.
5. The polarizing plate according to claim 4 , wherein each of the plurality of first optical patterns comprises a first oblique surface directly connected to the separation surface, and the first oblique surface is a single flat surface, a curved surface, or an angled flat surface.
6. The polarizing plate according to claim 1 , wherein the second patterned portion comprises filling portions between adjacent second optical patterns of the plurality of second optical patterns.
7. The polarizing plate according to claim 6 , wherein each of the plurality of second optical patterns comprises a second surface on a bottom portion thereof and a second oblique surface connected to the second surface.
8. The polarizing plate according to claim 7 , wherein a base angle defined between the maximum width of the second optical pattern and the second oblique surface is in a range from 60° to 85°.
9. The polarizing plate according to claim 6 , wherein a ratio of a total sum of the maximum widths of the first optical patterns to an entire width of the first resin layer and a ratio of a total sum of widths of the filling portions to an entire width of the second resin layer satisfy the following Relation 4:
1 ≤Y 1 /Y 2 ≤5, [Relation 4]
where Y 1 is the ratio of the total sum of the maximum widths of the first optical patterns to the entire width of the first resin layer, and Y 2 is the ratio of the total sum of the widths of the filling portions to the entire width of the second resin layer.
10. The polarizing plate according to claim 1 , wherein each of the plurality of first optical patterns has an aspect ratio of 0.1 to 10, and each of the plurality of second optical patterns has an aspect ratio of 0.5 to 5.
11. The polarizing plate according to claim 1 , wherein a longitudinal direction of each of the plurality of second optical patterns is tilted at an angle of −5° to 5° or at an angle of 85° to 95° with respect to a light absorption axis of the polarizer.
12. The polarizing plate according to claim 1 , wherein the first resin layer has a higher index of refraction than the second resin layer.
13. The polarizing plate according to claim 12 , wherein a difference in index of refraction between the first resin layer and the second resin layer is greater than or equal to 0.05.
14. An optical display apparatus comprising the polarizing plate according to claim 1 .
15. The polarizing plate according to claim 1 , wherein a ratio of the maximum width of the second optical pattern to the maximum width of the first optical pattern is from 2 to 3.
16. A polarizing plate comprising: a polarizer; and a pattern layer stacked on a light exit surface of the polarizer, wherein:
the pattern layer comprises a second resin layer and a first resin layer sequentially stacked from the polarizer;
a first patterned portion comprising a plurality of first optical patterns is formed at an interface between the first resin layer and the second resin layer;
a second patterned portion comprising a plurality of second optical patterns is formed on a lower surface of the second resin layer; and
the first optical patterns and the second optical patterns satisfy the following Relations 1 and 2:
0 μm <W 1≤15 μm; [Relation 1]
0 μm <W 2≤( W 1×3), [Relation 2]
where W1 is a maximum width (unit: μm) of the first optical pattern, and W2 is a maximum width (unit: μm) of the second optical pattern,
wherein each of the plurality of second optical patterns comprises an embossed pattern, and the second patterned portion comprises filling portions between adjacent second optical patterns of the plurality of second optical patterns, and
wherein the filling portions are filled with a light reflective material having a reflectivity of 95% or more.
17. The polarizing plate according to claim 16 , wherein the light reflective material comprises at least one selected from among aluminum, chromium, and nickel.