PRISM SHEET, BACK LIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME

摘要

A prism sheet, a back light unit and a liquid crystal display device using the prism sheet are provided to increase a brightness of the LCD device by forming a cross-section of the prism in a scalene triangle with an acute angle. A prism sheet includes a base film(142) and plural prism threads(144). The prism threads are formed on an upper surface of the base film. The prism threads have acute inner angles. Each of the prism threads includes first and second slant surfaces and an apex. The first slant surface is slanted from the base film by a first angle. The second slant surface is slanted from the base film by a second angle. The apex is formed by the first and second slant surfaces.