| CPC G02F 1/133607 (2021.01) [G02F 1/133617 (2013.01)] | 20 Claims |
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1. An optical film comprising:
a first sheet including a first base portion; a first pattern layer including a plurality of first prisms wherein each first prism has a first vertex angle and a first height, the first prisms are arranged parallel along a first direction with a first pitch distance between the first prisms and are formed on a first surface of the first base portion; and a second pattern layer including a plurality of first intaglio pyramids wherein each first intaglio pyramid has a second vertex angle and a second height, the first intaglio pyramids are arranged parallel along a second direction as a row direction of the first intaglio pyramids and a third direction as a column direction of the first intaglio pyramids with a second pitch distance between the first intaglio pyramids and are formed as intaglio on a second surface of the first base portion; and
a second sheet including a second base portion; a third pattern layer wherein a plurality of protrusions with an adhesive property is arranged randomly and is formed as a matte pattern on a third surface of the second base portion; and a fourth pattern layer including a plurality of second intaglio pyramids arranged parallel along a fourth direction as a row direction of the second intaglio pyramids and a fifth direction as a column direction of the second intaglio pyramids and formed as intaglio on a fourth surface of the second base portion,
wherein the first direction and the second direction form an angle in a range of 40° to 50°; the second direction and the fourth direction are substantially the same direction; the third direction and the fifth direction are substantially the same direction; and the first sheet and the second sheet are laminated through the third pattern layer.
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