US 11,686,967 B2
Viewing angle compensation film, polarizing plate comprising same, and display device comprising same
Byung Mook Kim, Daejeon (KR); Sunghak Bae, Daejeon (KR); Do Ki Chang, Daejeon (KR); Kyungki Hong, Daejeon (KR); Dae Hee Lee, Daejeon (KR); Sangcholl Han, Daejeon (KR); and Youngjin Kim, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 16/757,741
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Feb. 27, 2019, PCT No. PCT/KR2019/002374
§ 371(c)(1), (2) Date Apr. 20, 2020,
PCT Pub. No. WO2019/168345, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 10-2018-0024548 (KR), filed on Feb. 28, 2018.
Prior Publication US 2021/0191186 A1, Jun. 24, 2021
Int. Cl. G02F 1/1335 (2006.01)
CPC G02F 1/133502 (2013.01) [G02F 1/133528 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A screen display device comprising:
a liquid crystal cell;
a first polarizing plate which is provided at a visual field side of the liquid crystal cell;
a second polarizing plate which is provided at the opposite side to the visual field side of the liquid crystal cell; and
a backlight unit which is provided at a side of the second polarizing plate opposite to a side that faces the liquid crystal cell,
wherein the first polarizing plate or the second polarizing plate comprises a viewing angle compensation film comprising:
a pattern layer; and
a low refractive layer,
wherein a difference in refractive index between the pattern layer and the low refractive layer is 0.02 to 0.4,
wherein the pattern layer comprises:
a first surface which comprises a flat surface; and
a second surface which faces the first surface and comprises multiple protruding portions,
a plurality of grooves defined between the multiple protruding portions, wherein each of the grooves are entirely filled by the low refractive layer,
each of the protruding portions comprises a first inclined surface and a second inclined surface,
an angle θ1 between the first surface and the first inclined surface or a surface extending from the first inclined surface and an angle θ2 between the first surface and the second inclined surface or a surface extending from the second inclined surface, wherein θ1 and θ2 are different from each other, and
an angle θ between the first inclined surface or the surface extending from the first inclined surface and the second inclined surface or the surface extending from the second inclined surface, is 20° to 60°,
wherein the angle θ1 is 60° to 90°, and
wherein the second surface of the pattern layer is disposed to be close to the liquid crystal cell.