Liquid crystal display and manufacturing method of the same

Abstract

A liquid crystal display includes a first substrate, pixel electrodes disposed on the first substrate and including a first sub-pixel electrode and a second sub-pixel electrode separated from each other and positioned in one pixel area, gate lines connected to the pixel electrodes, data lines connected to the pixel electrodes, reference voltage lines connected to the second sub-pixel electrode of the pixel electrodes, a second substrate facing the first substrate, a common electrode disposed on the second substrate, and a liquid crystal layer positioned between the first substrate and the second substrate and including liquid crystal molecules, a first initial pretilt angle of the liquid crystal molecules corresponding to the first sub-pixel electrode for the second substrate surface is larger than a second initial pretilt angle of the liquid crystal molecules corresponding to the second sub-pixel electrode for the second substrate surface.

What is claimed is: 
     
         1 . A liquid crystal display comprising:
 a first substrate;   a plurality of pixel electrodes disposed on the first substrate and including a first sub-pixel electrode and a second sub-pixel electrode separated from each other and positioned in one pixel area;   a plurality of gate lines connected to the plurality of pixel electrodes;   a plurality of data lines connected to the plurality of pixel electrodes;   a plurality of reference voltage lines connected to the second sub-pixel electrode of the plurality of pixel electrodes;   a second substrate facing the first substrate;   a common electrode disposed on the second substrate;   a liquid crystal layer positioned between the first substrate and the second substrate and including a plurality of liquid crystal molecules including first and second crystal molecules; and   a first initial pretilt angle of the first liquid crystal molecules of the plurality of liquid crystal molecules corresponding to the first sub-pixel electrode with reference to a surface of the second substrate is larger than a second initial pretilt angle of the second liquid crystal molecules of the plurality of liquid crystal molecules corresponding to the second sub-pixel electrode with reference to the surface of the second substrate.   
     
     
         2 . The liquid crystal display of  claim 1 , further comprising:
 a first pad connected to the plurality of gate lines;   a second pad connected to the plurality of data lines;   a third pad connected to the plurality of reference voltage lines;   a first short point disposed on the first pad;   a second short point disposed on the second pad; and   a third short point disposed on the third pad.   
     
     
         3 . The liquid crystal display of  claim 2 , wherein:
 the first short point, the second short point, and the third short point are electrically connected between the first pad, the second pad, and the third pad and the common electrode,   the first short point and the second short point are positioned in the first region,   the third short point is positioned in the second region, and   the first region and the second region are electrically separated.   
     
     
         4 . The liquid crystal display of  claim 3 , further comprising:
 a first thin film transistor connected to the plurality of gate lines, the plurality of data lines, and the first sub-pixel electrode of the plurality of pixel electrodes;   a second thin film transistor connected to the plurality of gate lines, the plurality of data lines, and the second sub-pixel electrode of the plurality of pixel electrodes; and   a third thin film transistor connected to the plurality of gate lines, the second sub-pixel electrode of the plurality of pixel electrodes, and the plurality of reference voltage lines.   
     
     
         5 . The liquid crystal display of  claim 4 , further comprising:
 an alignment layer disposed on an inner surface of the first substrate and an inner surface of the second substrate, and   at least one of the alignment layer and the liquid crystal layer includes a light polymerization material.   
     
     
         6 . The liquid crystal display of  claim 3 , wherein:
 the second pad and the second short point are provided in a plurality,   the plurality of data lines is respectively connected to a plurality of second pads, and   the plurality of second short points is disposed on the plurality of second pads.   
     
     
         7 . The liquid crystal display of  claim 3 , wherein:
 the plurality of data lines and the second pad are connected to each other by a first connection portion, and   a width of the first connection portion is greater than a width of the plurality of data lines.   
     
     
         8 . The liquid crystal display of  claim 3 , wherein:
 the plurality of data lines and the second pads are connected to each other by a second connection portion,   the second connection portion includes a low-resistance material,   an insulating layer is positioned between the plurality of data lines and the second connection portion, and   the plurality of data lines and the second connection portion are connected to each other through a contact hole defined in the insulating layer.   
     
     
         9 . The liquid crystal display of  claim 2 , wherein:
 the first short point, the second short point, and the third short point are electrically connected to each other between the first pad, the second pad, and the third pad and the common electrode,   the first short point is positioned at the first region,   the second short point is positioned at the second region,   the third short point is positioned at a third region, and   the first region, the second region, and the third region are electrically separated.   
     
     
         10 . The liquid crystal display of  claim 1 , wherein:
 the first initial pretilt angle is larger than the second initial pretilt angle by about 0.3 degrees to about 2 degrees.   
     
     
         11 . The liquid crystal display of  claim 10 , wherein:
 the first initial pretilt angle is larger than the second initial pretilt angle by about 1 degree.   
     
     
         12 . A method for manufacturing a liquid crystal display, the method comprising:
 forming a first display panel including a plurality of pixel electrodes which includes a first sub-pixel electrode and a second sub-pixel electrode separated from each other and positioned in one pixel area,   a plurality of gate lines connected to the plurality of pixel electrodes,   a plurality of data lines connected to the plurality of pixel electrodes,   a plurality of reference voltage lines connected to the second sub-pixel electrode of the plurality of pixel electrodes,   a first pad portion connected to the plurality of gate lines,   a second pad portion connected to the plurality of data lines, and   a third pad portion connected to the plurality of reference voltage lines;   forming a second display panel including a common electrode;   forming a first short point connected to the first pad portion;   forming a second short point connected to the second pad portion;   forming a third short point connected to the third pad portion;   aligning and adhering the first display panel and the second display panel to each other;   dividing the second display panel into a first region corresponding to the first short point and the second short point, a second region corresponding to the second short point, and a third region; and   applying a first voltage to the first region, a second voltage to the second region, and a third voltage to the third region.   
     
     
         13 . The method of  claim 12 , wherein:
 the common electrode is divided into a plurality of electrodes insulated from each other in the dividing the second display panel into the first region, the second region, and the third region.   
     
     
         14 . The method of  claim 13 , wherein:
 a laser is used to divide the second display panel into the first region, the second region, and the third region.   
     
     
         15 . The method of  claim 13 , wherein:
 the first voltage applied to the first region is transmitted to the first short point and the second short point through the common electrode of the second display panel and is transmitted to the gate line and the data line through the first short point and the second short point, and   the second voltage applied to the second region is transmitted to the third short point through the common electrode of the second display panel and is transmitted to the reference voltage line through the third short point.   
     
     
         16 . The method of  claim 15 , wherein:
 the third voltage applied to the third region is only transmitted to the common electrode of the second display panel.   
     
     
         17 . The method of  claim 16 , further comprising:
 injecting a liquid crystal layer between the first display panel and the second display panel; and   irradiating a light to the liquid crystal display after applying the first voltage to the first region, the second voltage to the second region, and the third voltage to the third region.   
     
     
         18 . The method of  claim 15 , wherein:
 the forming the first display panel further includes forming   a first thin film transistor connected to the plurality of gate lines, the plurality of data lines, and the first sub-pixel electrode of the plurality of pixel electrodes;   a second thin film transistor connected to the plurality of gate lines, the plurality of data lines, and the second sub-pixel electrode of the plurality of pixel electrodes; and   a third thin film transistor connected to the plurality of gate lines, the second sub-pixel electrode of the plurality of pixel electrodes, and the plurality of reference voltage lines.   
     
     
         19 . The method of  claim 15 , wherein:
 the second pad and the second short point are provided in a plurality,   the plurality of data lines is respectively connected to the plurality of second pads, and   the plurality of second short points is disposed on the plurality of second pads.   
     
     
         20 . The method of  claim 15 , wherein:
 the plurality of data lines and the second pads are connected to each other by a first connection portion, and   a width of the first connection portion is greater than a width of the plurality of data lines.   
     
     
         21 . The method of  claim 15 , wherein:
 the plurality of data lines and the second pads are connected to each other by a second connection portion,   the second connection portion includes a low-resistance material, and   the plurality of data lines and the second connection portion are connected to each other through a contact hole provided in an insulating layer positioned between the plurality of data lines and the first connection portion.   
     
     
         22 . The method of  claim 15 , wherein:
 the dividing the second display panel into the first region, the second region, and the third region further includes:
 dividing the first region into a first sub-region corresponding to the first short point and a second sub-region corresponding to the second short point, and 
   the applying the first voltage, the second voltage, and the third voltage further includes:
 applying a first sub-voltage to the first sub-region and a second sub-voltage to the second sub-region, and magnitudes of the first sub-voltage and the second sub-voltage are different from each other. 
   
     
     
         23 . The method of  claim 12 , wherein:
 a first initial pretilt angle of first liquid crystal molecules corresponding to the first sub-pixel electrode for the second substrate surface is larger than a second initial pretilt angle of second liquid crystal molecules corresponding to the second sub-pixel electrode for the second substrate surface.   
     
     
         24 . The method of  claim 23 , wherein:
 the first initial pretilt angle is larger than the second initial pretilt angle by about 0.3 degrees to about 2 degrees.   
     
     
         25 . The method of  claim 24 , wherein:
 the first initial pretilt angle is larger than the second initial pretilt angle by about 1 degree.