Optical film and a liquid crystal display including the same

Abstract

An optical film is provided. The optical film includes a base film and a cover film. The base film includes a base member and a plurality of lens patterns disposed on the base member. The plurality of lens patterns protrudes from the base member and extends in a first direction. The cover film is disposed on the base film to cover the base member and the plurality of lens patterns. A refractive index of at least one of the lens patterns is smaller than a refractive index of the cover film. An aspect ratio of the at least one of the lens patterns ranges from 0.8 to 1.6.

What is claimed is: 
     
         1 . An optical film comprising:
 a base film including a base member and a plurality of lens patterns disposed on the base member, wherein the plurality of lens patterns protrudes from the base member and extends in a first direction; and   a cover film disposed on the base film to cover the base member and the plurality of lens patterns,   wherein a refractive index of at least one of the lens patterns is smaller than a refractive index of the cover film, and   wherein an aspect ratio of the at least one of the lens patterns ranges from 0.8 to 1.6.   
     
     
         2 . The optical film of  claim 1 , wherein the refractive index of the cover film is larger than the refractive index of the at least one of the lens patterns by 0.1 to 0.65. 
     
     
         3 . The optical film of  claim 1 , wherein at least one of the lens patterns has a shape of a lenticular lens or an elliptical lens. 
     
     
         4 . The optical film of  claim 1 , wherein the refractive index of the at least one of the lens patterns ranges from 1.0 to 1.49. 
     
     
         5 . The optical film of  claim 1 , wherein the refractive index of the at least one of the lens patterns ranges from 1.42 to 1.49. 
     
     
         6 . The optical film of  claim 1 , wherein the refractive index of the cover film ranges from 1.5 to 1.65. 
     
     
         7 . The optical film of  claim 1 , wherein the refractive index of the cover film ranges from 1.57 to 1.65. 
     
     
         8 . The optical film of  claim 1 , further comprising an adhesive layer formed on the base member and formed on a surface opposite to a surface on which the cover film is formed. 
     
     
         9 . An optical film comprising:
 a cover film including intaglios of a plurality of lens patterns extending in a first direction,   wherein an aspect ratio of at least one of the intaglios of the lens patterns ranges from 0.8 to 1.6, and   wherein a refractive index of the cover film ranges from 1.5 to 1.65.   
     
     
         10 . The optical film of  claim 9 , further comprising a base film which is attached to a surface of the cover film on which the intaglios of the lens patterns are formed. 
     
     
         11 . The optical film of  claim 10 , further comprising an air layer in the intaglios of the lens patterns disposed between the cover film and the base film. 
     
     
         12 . The optical film of  claim 9 , further comprising an adhesive formed on a first portion of a surface between the cover film and the base film,
 wherein the intaglios of the lens patterns are not formed on the first portion of the surface.   
     
     
         13 . The optical film of  claim 9 , further comprising a filling layer disposed in the intaglios of the lens patterns of the cover film,
 wherein a refractive index of the filling layer ranges from 1.0 to 1.49.   
     
     
         14 . The optical film of  claim 9 , wherein at least one of the intaglios of the lens patterns has a shape of a lenticular lens or an elliptical lens. 
     
     
         15 . A liquid crystal display comprising:
 a backlight unit;   a liquid crystal panel for receiving light from the backlight unit to display an image; and   an optical film disposed on an upper side of the liquid crystal panel,   wherein the optical film includes a plurality of lens patterns extending in a first direction, and an aspect ratio of at least one of the lens patterns ranges from 0.8 to 1.6.   
     
     
         16 . The liquid crystal display of  claim 15 , wherein the optical film includes a base film including a base member and the plurality of lens patterns, and a cover film formed on the base film to cover the base member and the plurality of lens patterns, and
 wherein a refractive index of the at least one of the lens patterns is smaller than a refractive index of the cover film.   
     
     
         17 . The liquid crystal display of  claim 16 , wherein the refractive index of the at least one of the lens patterns ranges from 1.0 to 1.49, and the refractive index of the cover film ranges from 1.5 to 1.65. 
     
     
         18 . The liquid crystal display of  claim 15 , wherein the optical film includes a cover film which is attached to an upper side of the liquid crystal panel, and the plurality of lens patterns are formed as intaglios in the cover film. 
     
     
         19 . The liquid crystal display of  claim 18 , further comprising an adhesive formed on a first portion of a surface between the cover film and the liquid crystal panel,
 wherein the intaglios of the lens patterns are not formed on the first portion of the surface.   
     
     
         20 . The liquid crystal display of  claim 18 , further comprising an air layer in each of the intaglios of the lens patterns or a filling layer disposed in each of the intaglios of the lens patterns,
 wherein a refractive index of the filling layer ranges from 1.0 to 1.49, and a refractive index of the cover film ranges from 1.5 to 1.65.