Method for manufacturing brightness enhancement film of liquid crystal display and structure thereof

Abstract

A brightness enhancement film for use on a display includes a first substrate, a first light transmitting layer mounted on said first substrate, a second light transmitting layer mounted on said first light transmitting layer, a third light transmitting layer mounted between said first light transmitting layer and second light transmitting layer, and a second substrate mounted on said second light transmitting layer, wherein said first and said second light transmitting layer have a first and a second chiral character, respectively, and said third light transmitting layer has a wide-band chiral character.

1 . A brightness enhancement film put in use on a display, said brightness enhancement film comprising: 
 a first substrate;    a first light transmitting layer mounted on said first substrate;    a second light transmitting layer mounted on said first light transmitting layer;    a third light transmitting layer mounted between said first light transmitting layer and second light transmitting layer; and    a second substrate mounted on said second light transmitting layer, wherein said first and said second light transmitting layer have a first and a second chiral character, respectively, and said third light transmitting layer has a wide-band chiral character.    
     
     
         2 . The brightness enhancement film according to  claim 1 , wherein said display is a LCD.  
     
     
         3 . The brightness enhancement film according to  claim 1 , wherein said first substrate is a polyethylene terephalate substrate (PET).  
     
     
         4 . The brightness enhancement film according to  claim 1 , further comprises a first alignment film mounted between said first substrate and said first light transmitting layer.  
     
     
         5 . The brightness enhancement film according to  claim 1 , wherein said first substrate is a ¼-wavelength plate.  
     
     
         6 . The brightness enhancement film according to  claim 1 , wherein said first, said second and said third light transmitting layers are all made of cholesteric liquid crystal (CLC).  
     
     
         7 . A structure of a display, said structure comprising: 
 a luminary for providing a backlight;    a light guide plate mounted on a side of said luminary for guiding the scattering direction of said backlight;    a brightness enhancement diffusion sheet mounted on said light guide plate for increasing luminance; and    a liquid crystal layer mounted on said brightness enhancement diffusion sheet;    wherein said brightness enhancement diffusion sheet further comprises: 
 a first substrate;  
 a first light transmitting layer mounted on said first substrate;  
 a second light transmitting layer mounted on said first light transmitting layer;  
 a third light transmitting layer mounted between said first light transmitting layer and second light transmitting layer;  
 a ¼-wavelength plate mounted on said second light transmitting layer; and  
 a polarizer mounted on said ¼-wavelength plate wherein said first and said second light transmitting layer have a first and a second chiral character, respectively, and said third light transmitting layer has a wide-band chiral character.  
   
     
     
         8 . The structure according to  claim 7 , further comprising a reflect sheet mounted below said light guide plate for increasing the efficiency of light.