Photoalignment method and liquid crystal display

Abstract

A photoalignment method includes irradiating light in a first direction to a first alignment layer, and irradiating light in a second direction opposite the first direction, after disposing a first mask on the first alignment layer.

What is claimed is: 
     
         1 . A liquid crystal display, comprising:
 a first substrate and a second substrate facing each other;   a first alignment layer and a second alignment layer formed on the first substrate and the second substrate, respectively, and   a liquid crystal layer formed between the first substrate and the second substrate and including liquid crystal molecules,   wherein the first alignment layer and the second alignment layer are photoaligned via a photoalignment operation,   the first alignment layer and the second alignment layer include a first irradiation region and a second irradiation region having different light irradiation amounts during the photoalignment operation, respectively, and   an alignment direction of liquid crystal molecules of a liquid crystal layer positioned in the first irradiation region is different from an alignment direction of liquid crystal molecules of a liquid crystal layer positioned in the second irradiation region.   
     
     
         2 . The liquid crystal display of  claim 1 , wherein:
 absolute values of alignment polar angles of the liquid crystal molecules positioned in the first irradiation region and the second irradiation region are a same as or different from each other and the alignment directions are opposite to each other.   
     
     
         3 . The liquid crystal display of  claim 1 , wherein:
 a light irradiation direction of the first alignment layer is disposed vertical to alight irradiation direction of the second alignment layer, and   the liquid crystal molecules of the liquid crystal layer form at least four regions having different alignment polar angles of the liquid crystal molecules.   
     
     
         4 . The liquid crystal display of  claim 3 , wherein:
 each of the at least four regions is at least one of a cycle-type in which the alignment direction of the liquid crystal molecules are cycled, a central-type in which the alignment direction of the liquid crystal molecules faces the center of the first alignment layer or the second alignment layer, a diffusion type in which the alignment direction of the liquid crystal molecules faces the edge of the first alignment layer or the second alignment layer, and a mixed-type including any combination thereof.   
     
     
         5 . The liquid crystal display of  claim 1 , wherein:
 the first alignment layer and the second alignment layer each comprise cinnamate.   
     
     
         6 . The liquid crystal display of  claim 5 , wherein:
 the first alignment layer and the second alignment layer further comprise benzene, and   a ratio of cinnamate/benzene (C/B) of the first alignment layer and the second alignment layer is in a range of about 0<C/B<0.5.   
     
     
         7 . The liquid crystal display of  claim 1 , further comprising:
 a third irradiation region positioned between the first irradiation region and the second irradiation region,   wherein a polar angle of the third irradiation region is smaller than polar angles of the first irradiation region and the second irradiation region.   
     
     
         8 . The liquid crystal display of  claim 1 , further comprising:
 a third irradiation region positioned at edges of the first irradiation region and the second irradiation region,   wherein a polar angle of the third irradiation region is smaller than polar angles of the first irradiation region and the second irradiation region.