Liquid crystal display device and defect repairing method for the same

Abstract

A liquid crystal display device comprises a pixel electrode, a thin film transistor, a gate line electrically coupled to the pixel through the thin film transistor and a first auxiliary layer having a first connecting portion overlapped with the pixel electrode and a second connecting portion overlapped with the gate line, wherein the pixel electrode is non-overlapped with the gate line and the first auxiliary layer is electrically insulated from the pixel electrode and the gate line. When a white defect occurs, the pixel electrode is electrically connected to the gate line through the first auxiliary layer thereby repairing the white defect as a black defect.

1 . A liquid crystal display device, comprising: 
 a first gate line for transmitting a first scan signal;    a second gate line next to the first gate line;    a pixel electrode formed without overlapping with the first gate line and the second gate line;    a thin film transistor having a first electrode electrically connected to the pixel electrode, a second electrode for receiving a data signal, and a gate electrode for receiving the first scan signal; and    a first auxiliary layer having a first connecting portion overlapped with the pixel electrode and a second connecting portion overlapped with one of the first gate line and the second gate line;    wherein the first auxiliary layer is electrically insulated from the pixel electrode, the first gate line and the second gate line.    
   
   
       2 . The liquid crystal display device as claimed in  claim 1 , wherein the pixel electrode is located between the first gate line and the second gate line.  
   
   
       3 . The liquid crystal display device as claimed in  claim 1 , wherein the first auxiliary layer, the first electrode and the second electrode are formed by same manufacturing processes.  
   
   
       4 . The liquid crystal display device as claimed in  claim 1 , further comprising: 
 a second auxiliary layer overlapped with and electrically insulated from the first connecting portion of the first auxiliary layer.    
   
   
       5 . The liquid crystal display device as claimed in  claim 4 , wherein the second auxiliary layer, the first gate line and the second gate line are formed by same manufacturing processes.  
   
   
       6 . The liquid crystal display device as claimed in  claim 4 , wherein the second auxiliary layer is electrically isolated from the first and second gate lines and electrically insulated from the pixel electrode.  
   
   
       7 . The liquid crystal display device as claimed in  claim 1 , further comprising: 
 a gate insulating layer covering the first and second gate lines, wherein the first electrode, the second electrode and the first auxiliary layer are formed on the gate insulating layer; and    a protective layer covering the first electrode, the second electrode and the first auxiliary layer, wherein the pixel electrode is formed on the protective layer.    
   
   
       8 . The liquid crystal display device as claimed in  claim 7 , further comprising: 
 a semiconductor layer formed on the gate insulating layer,    wherein a part of the first electrode and a part of the second electrode are formed on the semiconductor layer.    
   
   
       9 . A defect repairing method, applied to the liquid crystal display device of  claim 1  while the pixel electrode is defective, comprising: 
 connecting the first connecting portion of the first auxiliary layer with the pixel electrode; and    connecting the second connecting portion of the first auxiliary layer with the one of the first gate line and the second gate line.    
   
   
       10 . The defect repairing method as claimed in  claim 9 , further comprising: 
 making the pixel electrode electrically isolated from the thin film transistor.    
   
   
       11 . The defect repairing method as claimed in  claim 10 , wherein the making step is implemented by cutting off the electrical path between the pixel electrode and the thin film transistor.  
   
   
       12 . The defect repairing method as claimed in  claim 9 , wherein the two connecting steps are implemented by a laser.  
   
   
       13 . The defect repairing method as claimed in  claim 9 , wherein the liquid crystal display device further comprises a second auxiliary layer overlapped with the first connecting portion of the first auxiliary layer, and wherein the step of connecting the first connecting portion of the first auxiliary layer with the pixel electrode further comprises: 
 connecting the first connecting portion of the first auxiliary layer with the second auxiliary layer.    
   
   
       14 . The defect repairing method as claimed in  claim 13 , wherein the connecting steps are implemented by a laser.  
   
   
       15 . A pixel repairing structure for a liquid crystal display device having a first gate line and a pixel electrode adjacent to the first gate line, comprising: 
 a first auxiliary layer having a first portion overlapped with the pixel electrode and a second portion overlapped with the first gate line; and    a second auxiliary layer overlapped with the first portion of the first auxiliary layer;    wherein the first auxiliary layer is electrically insulated from the pixel electrode, the first gate line and the second auxiliary layer.    
   
   
       16 . The pixel repairing structure as claimed in  claim 15 , further comprising: 
 a second gate line next to the first gate line such that the pixel electrode is located between the first gate line and the second gate line.    
   
   
       17 . The pixel repairing structure as claimed in  claim 16 , wherein the second auxiliary layer is electrically isolated from the first and second gate lines and electrically insulated from the pixel electrode.  
   
   
       18 . The pixel repairing structure as claimed in  claim 16 , wherein the second auxiliary layer, the first gate line and the second gate line are formed by same manufacturing processes.  
   
   
       19 . The pixel repairing structure as claimed in  claim 15 , wherein the second auxiliary layer is electrically isolated from the first gate line and electrically insulated from the pixel electrode.  
   
   
       20 . The pixel repairing structure as claimed in  claim 15 , further comprising: 
 a gate insulating layer covering the first gate line and the second auxiliary layer, wherein the first auxiliary layer is formed on the gate insulating layer; and    a protective layer covering the first auxiliary layer, wherein the pixel electrode is formed on the protective layer.