Light control film

Abstract

Light control films, and a method for manufacturing tools used to microreplicate light control films.

We claim: 
     
         1 . A light control film, comprising:
 a light input surface and a light output surface opposite the light input surface; and   alternating transmissive and non-transmissive regions disposed between the light input surface and the light output surface;
 wherein the first interface between each transmissive and non-transmissive region forms a first interface angle θ I  measured from the major viewing axis of the film, wherein first interface angle θ I  is 1° or less; and 
 wherein light incident on the light input surface exits the light output surface having a maximum relative brightness ratio (RBR) in the major viewing axis direction of  65  or greater and an effective polar viewing angle (EPVA) of 45° or less. 
   
     
     
         2 . The light control film of  claim 1 , wherein the first interface angle θ I  is 0.8° or less. 
     
     
         3 . The light control film of  claim 1 , wherein the first interface angle θ I  is 0.5° or less. 
     
     
         4 . The light control film of  claim 1 , further comprising a second interface between transmissive and non-transmissive regions, the second interface being opposite the transmissive region from the first interface, wherein the second interface forms an angle θ I2  from the major viewing axis that is approximately equal to θ I . 
     
     
         5 . The light control film of  claim 1 , wherein the average pitch of each successive transmissive region is less than 0.040 mm.