Patent ID: 7916242
Filing Date: 2011-03-29
Classification: G02B,G02F

Abstract:
1. A prism sheet, comprising: a transparent base film, the transparent base film including first and second surfaces opposite each other and parallel to each other; and an optical refracting part on the second surface of the transparent base film, the optical refracting part including a plurality of prism units, wherein the plurality of prism units are integral with the transparent base film, each prism unit having a predetermined height and extending along a first direction on the second surface of the transparent base film, the predetermined height being perpendicular to the first direction and to the second surface of the transparent base film; wherein each prism unit includes a ridge extending along the first direction, a distance along a normal between the second surface of the transparent base film and the ridge defining the predetermined height of the prism unit; and wherein at least two prism units include ridges inclined at predetermined angles with respect to the second surface of the transparent base film, the predetermined angles being other than zero, and the inclined ridges being unevenly distributed on the second surface of the transparent base film along a second direction substantially perpendicular to the first direction.