Patent ID: 7751679

Claim:
A brightness enhancement film, comprising: a pair of first sides corresponding to each other, a pair of second sides corresponding to each other, and a plurality of first micro-reflectors and second micro-reflectors disposed side by side; said first micro-reflectors having a first average height and a first average width, said second micro-reflectors having a second average height and a second average width, said first average height and said first average width being different from said second average height and said second average width, each of said first micro-reflectors and said second micro-reflectors having a triangular cross-section viewed from the first side, said triangular cross-section having an apex and a base, said apex of said triangular cross-section defining a crest line extending longitudinally from the first side, neighboring lines being disposed between crest lines to delineate adjacent ones of said first micro-reflectors and said second micro-reflectors, said crest lines of said first and second micro-reflectors each defining a straight horizontal profile and a wavy vertical profile having continuous valleys and peaks, said first micro-reflectors being longitudinally offset in vertical profile from said second micro-reflectors, the widths of said first micro-reflectors and said second micro-reflectors varying along with said valleys and said peaks, said neighboring lines between said first micro-reflectors and said second micro-reflectors being wavy.