Liquid crystal display having wide viewing angle

Abstract

A liquid crystal display includes a first substrate with pixel electrodes, and a second substrate with a common electrode facing the first substrate. The common electrode has depression patterns corresponding to the pixel electrodes. The side wall of each depression pattern is at an angle of 30-120 degrees with respect to the first substrate. The depression patterns of the common electrode are formed through making depression patterns at color filters. In this structure, the liquid crystal display bears wide viewing angle and good picture quality.

1 . A common electrode substrate for a liquid crystal display, comprising: a substrate; a common electrode formed on the substrate; and a plurality of pixel regions, wherein the common electrode has a non-flat surface. 
   
   
       2 . The common electrode substrate of  claim 1 , wherein the common electrode has a first portion and a second portion, a first distance between the first portion and the substrate is different from a second distance between the second portion and the substrate. 
   
   
       3 . The common electrode substrate of  claim 2 , further comprising a black matrix formed on the substrate, wherein the first portion of the common electrode is arranged on the black matrix. 
   
   
       4 . The common electrode substrate of  claim 3 , wherein the first distance is smaller than the second distance. 
   
   
       5 . The common electrode substrate of  claim 4 , further comprising a plurality of color filters formed on the substrate, each color filter having a depressed portion formed within the corresponding pixel region. 
   
   
       6 . The common electrode substrate of  claim 5 , the depressed portion of the color filter corresponds to the first portion of the common electrode. 
   
   
       7 . The common electrode substrate of  claim 5 , wherein the depressed portion of the color filter has a depth smaller than a thickness of the color filter. 
   
   
       8 . A liquid crystal display (LCD), comprising: a first substrate; a pixel electrode formed on the first substrate; a storage electrode formed on the first substrate; a second substrate facing the first substrate; and a common electrode formed on the second substrate and having a not-flat surface. 
   
   
       9 . The LCD of  claim 8 , wherein the pixel electrode covers a portion of the storage electrode in a width direction. 
   
   
       10 . The LCD of  claim 8 , further comprising a color filter formed on the second substrate and having a depressed portion. 
   
   
       11 . The LCD of  claim 10 , further comprising a black matrix formed on the second substrate. 
   
   
       12 . The LCD of  claim 11 , wherein the black matrix has a portion overlapped with the depressed portion. 
   
   
       13 . The LCD of  claim 10 , wherein the pixel electrode has an opening pattern, and the depressed portion and the opening pattern form a substantially closed area. 
   
   
       14 . The LCD of  claim 13 , further comprising: a liquid crystal layer sandwiched between the first substrate and the second substrate, the liquid crystal layer having liquid crystal molecules with negative dielectric an isotropy; a first alignment layer formed on the pixel electrode; a second alignment layer formed on the common electrodes, wherein the first alignment layer and the second alignment layer align long axes of the liquid crystal molecules perpendicular to the substrates; a first polarizing plate formed on an outer surface of the first substrate; and a second polarizing plate formed on an outer surface of the second substrate. 
   
   
       15 . The LCD of  claim 14 , wherein the first polarizing plate and the second polarizing plate have polarizing axes perpendicular to each other. 
   
   
       16 . The LCD of  claim 15 , wherein the liquid crystal molecules placed within the closed area defined by the depressed portion and the opening pattern have four average long axial directions. 
   
   
       17 . The LCD of  claim 16 , wherein each of the average long axial directions is slanted at an angle between about 40.degree. and about 50.degree. with respect to the polarizing axes of the first polarizing plate and the second polarizing plate.