Patent ID: 7232250
Filing Date: 2007-06-19
Classification: G02B

Abstract:
1. A prism sheet of a backlight module for an LCD located between a light guide plate of said backlight module and a panel of said LCD, comprising: a base layer adapted to be above said light guide plate; and a prism layer formed on one side of said base layer, said prism layer being composed of a plurality of parallel longitudinal rows of first lenses and a plurality of parallel latitudinal rows of second lenses which are intersected wit each other at right angles, wherein each of said parallel longitudinal rows of said first lenses has a triangular cross section and a first ridge at a top thereof and there is no gap between bottoms of every two adjacent rows of said first lenses, each of said parallel longitudinal rows of said second lenses has a triangular cross section and a first ridge at a top thereof and there is no gap between bottoms of every two adjacent rows of said second lenses, thereby making said first ridge intersect said second ridge at a right angle and forming a plurality of rectangular recesses which are open at a top and have four slant triangular surfaces intersecting each other at a point.