Method for manufacturing compound optical film

Abstract

A compound optical film includes an unitary two-layer structure with of a light guide layer and a light reflective layer attached on the light guide layer. A number of light scattering particles are dispersed in the light guide layer adjacent to an interface between the light guide layer and the light reflective layer. The compound optical film can reduce the thickness of backlight module while the compound optical film is used in backlight module. The present art also relates to a manufacturing method for the compound optical film.

What is claimed is: 
     
         1 . A method for manufacturing a compound optical film comprising:
 providing a light reflective film including a second contact surface and a bottom surface facing away from the second contact surface;   forming a plurality of light scattering particles on the second contact surface of the light reflective film;   placing the light reflective film into a molding cavity of a mold, the bottom surface of the light reflective film attached on an inner wall of the molding cavity, whereby the second contact surface and the light scattering particles are exposed in the molding cavity;   introducing light-permeable material into the molding cavity to cover the second contact surface and the light scattering particles, thereby forming a light guide layer on the second contact surface.   
     
     
         2 . The method of  claim 1 , wherein the light scattering particles are formed on the second contact surface by roller-printing light scattering particles contained ink on the second contact surface. 
     
     
         3 . The method of  claim 2 , wherein the light scattering particles are TiO2 or BaSO4. 
     
     
         4 . The method of  claim 1 , wherein a distribution density of the light scattering particles formed on the second contact surface is uniform. 
     
     
         5 . The method of  claim 1 , wherein a distribution density of the light scattering particles gradually increases along a direction away from the light incident surface. 
     
     
         6 . The method of  claim 1 , wherein a material of the light guide layer is selected from the group consisting of Polymethyl Methacrylate (PMMA), Cocio Olefines Polymers (COP), and Polycarbonate (PC).