Polarizing plate and optical display device comprising same
A polarizing plate and an optical display device comprising same are provided. The polarizing plate comprises: a polarizer; and a pattern layer disposed on the upper surface of the polarizer. The pattern layer includes a first resin layer, wherein the first resin layer has one or more intaglio patterns formed on the lower surface thereof. The intaglio pattern has side surfaces, and a first surface and a second surface having different base angles with respect to the maximum width of the intaglio pattern are continuously formed on the side surfaces. The first and second surfaces satisfy Equation 1, and when h1 is a height projected on the first surface and h2 is a height projected on the second surface, among the maximum heights of the intaglio pattern, h1 and h2 satisfy Equation 2.
1. A polarizing plate comprising:
a polarizer; and
a pattern layer disposed on an upper surface of the polarizer,
wherein the pattern layer comprises a first resin layer, the first resin layer being formed on a lower surface thereof with at least one engraved pattern having a lateral side, the lateral side having a first facet and a second facet consecutive to the first facet, the first facet and the second facet having different base angles with respect to a maximum width of the engraved pattern and satisfying Relations 1 and 2:
θ1>θ2, [Relation 1]
wherein Relation 1, θ1 denotes a base angle of the first facet, θ2 denotes a base angle of the second facet, about 70°≤θ1≤about 90°, about 0°<θ2<about 90°; and
about 0.5≤ h 1/( h 1+ h 2)<about 1.0, [Relation 2]
wherein Relation 2, h1 denotes a projection height of the first facet projected on a maximum height of the engraved pattern and h2 denotes a projection height of the second facet projected on the maximum height of the engraved pattern.
2. The polarizing plate according to claim 1 , wherein the engraved pattern has an aspect ratio of greater than about 1.0.
3. The polarizing plate according to claim 1 , wherein the engraved pattern has a (θ1−θ2) value of greater than about 0° but not more than about 20°.
4. The polarizing plate according to claim 1 , wherein h1/(h1+h2) ranges from about 0.5 to about 0.9.
5. The polarizing plate according to claim 1 , wherein the engraved pattern comprises a third facet formed at a top portion thereof and the lateral side connected to the third facet, and the third facet is a flat surface.
6. The polarizing plate according to claim 5 , wherein the first facet is closer to a separation surface or the third facet than the second facet.
7. The polarizing plate according to claim 1 , wherein the lateral side is free from facets having the same base angle.
8. The polarizing plate according to claim 1 , wherein each of the first facet and the second facet is a flat surface or a curved surface.
9. The polarizing plate according to claim 1 , wherein a maximum width of a first region of the engraved pattern having the first facets at both lateral sides thereof is about 1.1 times to about 3 times a maximum width of a second region of the engraved pattern having the second facets at both lateral sides thereof.
10. The polarizing plate according to claim 1 , wherein the engraved pattern has a longitudinal direction tilted at an angle of about −20° to about +20° with respect to an absorption axis of the polarizer.
11. The polarizing plate according to claim 1 , wherein the pattern layer further comprises a filling portion partially filling at least part of the engraved pattern or a second resin layer having the filling portion formed thereon.
12. The polarizing plate according to claim 11 , wherein the first resin layer has a smaller index of refraction than the filling portion or the second resin layer.
13. The polarizing plate according to claim 11 , wherein the first resin layer has a higher index of refraction than the filling portion or the second resin layer.
14. The polarizing plate according to claim 11 , wherein an absolute value of a difference in index of refraction between the second resin layer or the filling portion and the first resin layer is about 0.3 or less.
15. The polarizing plate according to claim 11 , wherein the second resin layer is an adhesive layer.
16. The polarizing plate according to claim 5 , wherein a minimum distance between the third face and an upper surface of the first resin layer ranges from about 0 μm to about 10 μm.
17. The polarizing plate according to claim 1 , wherein the first resin layer further comprises a separation surface between adjacent engraved patterns.
18. The polarizing plate according to claim 1 , further comprising: a protective layer formed on an upper surface of the first resin layer.
19. The polarizing plate according to claim 1 , wherein the engraved pattern is composed of the first facet adjoining a separation surface on the lower surface of the first resin layer, the second facet consecutive to the first facet, and a third facet formed at the top portion thereof to be consecutive to the second facet.
20. The polarizing plate according to claim 1 , wherein the engraved pattern is composed of the second facet adjoining a separation surface on the lower surface of the first resin layer, the first facet consecutive to the second facet, and a third facet formed at the top portion thereof to be consecutive to the first facet.
21. An optical display apparatus comprising the polarizing plate according to claim 1 .