OPTICAL PRISM SHEET HAVING A CERTAIN ROUGHNESS THEREON

摘要

Disclosed herein is an optical prism sheet having both functions of refracting and diffusing light. The optical prism sheet includes an optical refracting part comprising a plurality of unit prisms having a predetermined cross- section on one side of the optical prism sheet, and an optical diffusion part comprising fine irregularity and having a predetermined roughness on a surface of the optical refracting part. A unit surface area of the optical refracting part having the fine irregularity is 1.1 to 100 times, and more preferably, 1.5 to 20 times that of the optical refracting part having only the unit prisms without the fine irregularity. Further, a liquid crystal display backlight unit using the optical sheet is provided.