Diffuser-integrated prism sheet for backlight units and method of manufacturing the same

Abstract

A diffuser-integrated prism sheet for backlight units includes: a lower diffuser layer having a light diffusion structure on a lower surface thereof; a lower layer on an upper surface of the lower diffuser layer; an intermediate layer formed on an upper surface of the lower layer and having prism-shaped protrusions; an upper layer on an upper surface of the intermediate layer; and an upper diffuser layer formed on an upper surface of the upper layer and having a light diffusion structure on an upper surface of the upper diffuser layer. An air layer is formed between a lower surface of the upper layer and valleys of the prism-shaped protrusions, and ridges of the prism-shaped protrusions and the lower surface of the upper layer are integrated with each other; and the light diffusion structure on the upper surface of the upper diffuser layer includes hemispherical protrusions.

What is claimed is: 
     
         1 . A diffuser-integrated prism sheet for backlight units, comprising:
 a lower diffuser layer, having a light diffusion structure formed on a lower surface thereof;   a lower layer, formed on an upper surface of the lower diffuser layer;   an intermediate layer, formed on an upper surface of the lower layer and having a plurality of prism-shaped protrusions formed parallel to each other;   an upper layer, formed on an upper surface of the intermediate layer; and   an upper diffuser layer, formed on an upper surface of the upper layer and having a light diffusion structure formed on an upper surface of the upper diffuser layer,   wherein an air layer is formed between a lower surface of the upper layer and valleys of the prism-shaped protrusions of the intermediate layer, and ridges of the prism-shaped protrusions of the intermediate layer and the lower surface of the upper layer are integrated with each other using an adhesive; and   wherein the light diffusion structure formed on the upper surface of the upper diffuser layer comprises a plurality of hemispherical protrusions for diffusing light.