Patent ID: 7411732

Claim:
A brightness enhancement structure, comprising: an upper diffuser and a lower diffuser, for diffusing surface light; a brightness enhancement film disposed between the upper diffuser and the lower diffuser, for enhancing the surface light passing through the lower diffuser, the brightness enhancement film comprising: a main part having a main part plane; and a plurality of prism structures successively disposed side by side on the main part plane, each of the prism structures comprising: a first triangular prism; a second triangular prism having a first right angle, adjacent to one side of the first triangular prism, the first right angle being adjacent to one base angle of the first triangular prism; and a third triangular prism having a second right angle, adjacent to another side of the first triangular prism, the second right angle being adjacent to an other base angle of the first triangular prism, wherein the one base angle and the other base angle of the first triangular prism have different angular magnitudes; wherein the first triangular prism, the second triangular prism, and the third triangular prism have different orientations and are disposed on the main part plane; wherein the second triangular prism of one of the prism structures is adjacent to the third triangular prism of an adjacent one of the prism structures, and the second triangular prism of the one prism structure and the third triangular prism of the adjacent one prism structure have different orientations.