Liquid crystal display and method for manufacturing the same

Abstract

A light redirecting film and a method for manufacturing the same are provided. The light redirecting film comprises a substrate, a first diffraction grating layer of a first curable resin on the substrate and a second diffraction grating layer of a second curable resin on the first diffraction grating layer. Wherein the grating directions of the first diffraction grating layer and the second diffraction grating layer cross each other at an angle of 90±10°, and the difference of the refractive index of the first curable resin and the second curable resin is no less than 0.1 and no more than 0.3.

What is claimed is: 
     
         1 . A liquid crystal display (LCD) comprising:
 a liquid crystal panel; and   a light redirecting film attached in front of the displaying side of the liquid crystal panel, comprising:
 a substrate; 
 a first diffraction grating layer formed on the substrate, and the first diffraction grating layer comprising a plurality of first gratings along with first direction; and 
 a second diffraction grating layer formed on the first diffraction grating layer, and the second diffraction grating layer comprising a plurality of second gratings along with second direction; 
 wherein the first direction and the second direction cross each other at an angle of 90±10°; 
 wherein the first diffraction grating layer includes a first curable resin having a first refractive index of n1, and the second diffraction grating layer includes a second resin having a second refractive index of n2, and the difference of n1 and n2 is no less than 0.1 and no more than 0.3; 
 wherein, gamma values reflecting to the contrast ration and color saturation of the LCD are greater than 0.9 at different horizontal and/or vertical viewing angles 80 degrees. 
   
     
     
         2 . The liquid crystal display (LCD) according to  claim 1 , wherein n1 is in the range of 1.4 to 1.7. 
     
     
         3 . The liquid crystal display (LCD) according to  claim 1 , wherein the widths of each of the first gratings and each of the second gratings are independently in the range of 0.3 μm to 1.5 μm. 
     
     
         4 . The liquid crystal display (LCD) according to  claim 1 , wherein the gaps between adjacent two of the first gratings and the gaps between adjacent two of the second gratings are independently in the range of 0.3 μm to 1.5 μm. 
     
     
         5 . The liquid crystal display (LCD) according to  claim 1 , wherein the heights of each of the first gratings and each of the second gratings are independently in the range of 0.5 μm to 1.5 μm. 
     
     
         6 . The liquid crystal display (LCD) according to  claim 1 , wherein n2 is in the range of 1.4 to 1.7. 
     
     
         7 . The liquid crystal display (LCD) according to  claim 1 , further comprising a third curable resin with a third refractive index of n3 formed on the second diffraction grating layer, and n3 is in the range of 1.4 to 1.7. 
     
     
         8 . The liquid crystal display (LCD) according to  claim 7 , wherein the difference of n2 and n3 is no less than 0.1 and no more than 0.3. 
     
     
         9 . The liquid crystal display (LCD) according to  claim 7 , wherein n2 is greater than n1 and n3. 
     
     
         10 . The liquid crystal display (LCD) according to  claim 7 , further comprising an optical film adhered to the third curable resin, wherein the optical film is selected from one of a group consisting of a polarizing film, a hard-coating film, a low reflective film, an anti-reflective film, an anti-glaring film and a protective film or combinations thereof.