Display device, electronic paper and electronic paper file

Abstract

The invention comprises a display sheet, a light guide sheet and a light source provided to at least one side of the light guide sheet. And an electronic paper of the invention has a configuration for color display that the display sheet is made up by laminating respective display sheets for red, green and blue colors.

1 . A display device comprising: 
 a display sheet;    a light guide sheet, a surface of which is in direct contact with a surface of the display sheet; and    a light source placed on at least one side of the light guide sheet.    
   
   
       2 . A display device according to  claim 1 , wherein the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch.  
   
   
       3 . A display device according to  claim 2 , wherein the pitch of the grooves is corresponding to a pixel of the display sheet.  
   
   
       4 . A display device according to  claim 2 , wherein the pitch of the grooves get smaller gradually as the groove keeps away from the light source.  
   
   
       5 . (canceled)  
   
   
       6 . A display device according to  claim 2 , wherein the depth of the groove gets larger gradually as the groove keeps away from the light source.  
   
   
       7 . (canceled)  
   
   
       8 . (canceled)  
   
   
       9 . An electronic paper comprising: 
 a display sheet using a nonvolatile and reflective liquid crystal;    a light guide sheet, a surface of which is in direct contact with a surface of the display sheet; and    a light source placed on at least one side of the light guide sheet.    
   
   
       10 . An electronic paper according to  claim 9 , wherein the display sheet has a reflective type structure that a display sheet using a nonvolatile and reflective liquid crystal for red color, a display sheet using a nonvolatile and reflective liquid crystal for green color, and a display sheet using a nonvolatile and reflective liquid crystal for blue color are laminated.  
   
   
       11 . An electronic paper according to  claim 9 , wherein the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch.  
   
   
       12 . An electronic paper according to  claim 11 , wherein the pitch of the grooves is corresponding to a pixel of the display sheet.  
   
   
       13 - 15 . (canceled)