DOUBLE-SIDED PRISM SHEET, PRISM SHEET SET, AND BACKLIGHT

摘要

PROBLEM TO BE SOLVED: To provide a double-sided prism sheet which is high in front luminance, is small in incoming light unevenness, and can be reduced in the number of parts, and a backlight.

SOLUTION: The double-sided prism sheet has a first prism arrayed with unit prisms of an approximately triangular sectional shape on the front side of a transparent base material having angles 5°≤θ1≤20° and 40°≤θ2≤55° in a one-dimensional direction and has a second prism arrayed with unit prisms of an approximately triangular sectional shape on the rear side of a transparent base material having angles 25°≤Φ1≤35° and 25°≤Φ2≤35° in a one-dimensional direction. The angle formed by the arraying direction of the second prism and the arraying direction of the first prism arrayed on the front side is 35°≤γ≤55°.

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