Automatically aligned liquid crystal display and its reflector structure

Abstract

An automatically aligned liquid crystal display comprises an upper and a lower substrates, at least one polarizer,. at least one serial retardation films and a uniformly distributed and vertically or near-vertically aligned liquid crystal layer. The substrates have respectively a common electrode layer and a pixel electrode layer thereon. One of the electrode layers is transparent and the other is a layer of automatically aligned diffusing reflective or partially reflective devices. The device is formed on a single substrate. The automatically aligned liquid crystal display of the invention has different bump structures formed in the pixel region, around the boundary of the pixel region, at a contact hole near the pixel center, or around the boundary of the pixel region and the transparent area. The reflective or partially reflective liquid crystal display of the invention forms multiple domains with good properties of a very high contrast ratio and a wider viewing angle.

1 . An aligned automatically aligned reflector structure applying to a reflective or partially reflective liquid crystal display, said reflector structure comprising: 
 a lower substrate; and    an automatically aligned diffusing reflective device formed on said lower substrate, said reflective device comprising at least a reflective metal layer and an inner diffusion layer; said reflective device having at least one convex or concave bump in the pixel region.    
   
   
       2 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said reflective metal layer is a layer of totally reflective metal.  
   
   
       3 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said reflective metal layer is a layer of transparent and thin metal.  
   
   
       4 . The automatically aligned reflector structure as claimed in  claim 1 , where said reflective metal layer is a metal layer consisting of a transparent electrode layer with at least one opening in the transparent area and a layer of aluminum- or silver-alloy in the reflective area.  
   
   
       5 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said automatically aligned diffusing reflective device further comprises: 
 an inner diffusion layer formed on said lower substrate, said inner diffusion has at least one convex bump around the boundary of the pixel region of said liquid crystal display; and    a reflective metal layer formed on said inner diffusion layer.    
   
   
       6 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said automatically aligned diffusing reflective device further comprises: 
 an inner diffusion layer formed on said lower substrate, and said inner diffusion layer has at least one convex bump around the boundary of pixel region of said liquid crystal display and a concave bump at a contact hole near the pixel center; and    a reflective metal layer formed on said inner diffusion layer.    
   
   
       7 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said automatically aligned diffusing reflective device further comprises: 
 an inner diffusion layer formed on said lower substrate, and said inner diffusion layer has at least one convex bump around the boundary of the pixel region of said liquid crystal display and a concave bump at the contact hole near the pixel center in the transparent area of said liquid crystal display;    a reflective metal layer formed on said inner diffusion layer and in the reflective area of said liquid crystal display; and    a transparent electrode layer formed on said inner diffusion layer and in the transparent area of said liquid crystal display.    
   
   
       8 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said automatically aligned diffusing reflective device further comprises: 
 an inner diffusion layer being formed on said lower substrate, and said inner diffusion layer has at least one convex bump around the boundary of pixel region of said liquid crystal display, a concave bump at a contact hole near the pixel center in the transparent area of said liquid crystal display, and a surround wall-bump structure around the boundary of the transparent area of said liquid crystal display;    a reflective metal layer formed on said inner diffusion layer and in the reflective area of said liquid crystal display; and    a transparent electrode layer formed on said inner diffusion layer and in the transparent area of said liquid crystal display.    
   
   
       9 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said automatically aligned diffusing reflective device further comprises: 
 an inner diffusion layer formed on said lower substrate;    a reflective metal layer formed on said inner diffusion layer;    an over coating layer formed on said reflective metal layer; and    a layer of indium-tin-oxide pattern formed on said over coating layer.    
   
   
       10 . The automatically aligned reflector structure as claimed in  claim 1 , wherein said automatically aligned diffusing reflective device further comprises: 
 an inner diffusion layer formed on said lower substrate;    a reflective metal layer formed on said inner diffusion layer;    a color filter formed on said reflective metal layer;    an over coating layer formed on said color filter;    a layer of indium-tin-oxide pattern formed on said over coating layer; and    a plurality of convex bumps formed respectively around the boundaries of red, green and blue sub-pixels of said liquid crystal display.    
   
   
       11 . The automatically aligned reflector structure as claimed in  claim 1 , wherein the material for said reflective metal layer is chosen from the group of aluminum, silver, aluminum alloy, silver alloy, and multi-layer film with a high reflectivity.  
   
   
       12 . The automatically aligned reflector structure as claimed in  claim 1 , wherein the material for said inner diffusion layer is chosen from the group of positive photoresist, negative photoresist, and acrylic resin.