Liquid Crystal Display

Abstract

A light redirecting film in a sandwich-laminated structure is provided. The light redirecting film comprises a first layer, a second layer; and an intermediate layer sandwiched between the first layer and the second layer. The intermediate layer includes a first grating surface having a plurality of first gratings extending in a first grating direction and a second grating surface opposite to the first grating surface having a plurality of second gratings extending in a second grating direction, wherein the first grating direction and the second grating direction cross each other at an angle of 90°±10°, and the first grating surface and the second grating surface of the intermediate layer are gap-filled and planarized with the first layer and the second layer respectively to generate the light redirecting film.

What is claimed is: 
     
         1 . A liquid crystal display (LCD) comprising:
 a liquid crystal panel; and   a light redirecting film in a sandwich-laminated structure attached in front of the displaying side of the liquid crystal panel, comprising:
 a first layer having a first refraction index of n1; 
 a second layer having a third refraction index of n3; and 
 an intermediate layer having a second refraction index of n2, disposed between the first layer and the second layer, including a first grating surface having a plurality of first gratings extending in a first grating direction and a second grating surface opposite to the first grating surface having a plurality of second gratings extending in a second grating direction, wherein the first grating direction and the second grating direction cross each other at an angle of 90°±10°, and the first grating surface and the second grating surface of the intermediate layer are gap-filled and planarized with the first layer and the second layer respectively, and n2 is greater than n1 and n3; 
   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 the first refraction index of n1, the second refraction index of n2, and the third refraction index of n3 are all in the range of 1.4 to 1.7. 
     
     
         3 . The liquid crystal display (LCD) according to  claim 1 , wherein the difference of n2 and n1 is no less than 0.1 and no more than 0.3. 
     
     
         4 . The liquid crystal display (LCD) according to  claim 1 , wherein the difference of n2 and n3 is no less than 0.1 and no more than 0.3. 
     
     
         5 . The liquid crystal display (LCD) according to  claim 1 , wherein each of the first gratings has a width of w 1 , each of the second gratings has a width of w 2 , and w 1 , w 2  are independently in the range of 0.3 μm to 1.5 μm. 
     
     
         6 . The liquid crystal display (LCD) according to  claim 1 , wherein each of the first gratings has a depth of d 1 , each of the second gratings has a depth of d 2 , and d 1 , d 2  are independently in the range of 0.5 μm to 1.5 μm. 
     
     
         7 . The liquid crystal display (LCD) according to  claim 1 , wherein the grating gap of g 1  between adjacent two of the first gratings and the grating gap of g 2  between adjacent two of the second gratings are independently in the range of 0.3 μm to 1.5 μm. 
     
     
         8 . The liquid crystal display (LCD) according to  claim 1 , wherein the widths, the depths and the grating gaps of the first gratings and the second gratings can be the same or different. 
     
     
         9 . The liquid crystal display (LCD) according to  claim 1 , further comprising an optical film adhered to the light redirecting film, 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.