Patent ID: 11921374
Assignee: CHANGKANG CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A backlight unit comprising:
a light source;
a color conversion sheet disposed above the light source for converting a color of light emitted from the light source; and
an optical film disposed on the color conversion sheet, the optical film comprising:
a first sheet having a first pattern layer including a plurality of pyramid patterns formed on one entire side of a first base and a second pattern layer consisting of a plurality of adhesive irregular protrusion portions forming a different pattern from the plurality of pyramid patterns and irregularly disposed on the other entire side of the first base,
a second sheet having a third pattern layer including a plurality of pyramid patterns formed on one entire side of a second base and a fourth pattern layer corresponding to the second pattern layer and formed on the other entire side of the second base,
wherein the fourth pattern layer includes a plurality of irregular protrusion portions, and
wherein the first sheet and the second sheet are laminated by the plurality of adhesive irregular protrusion portions of the second pattern layer.