Viewing angle compensation film, polarizing plate comprising same, and display device comprising same

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.