Substrate for a display device, a method for repairing the same, a method for repairing a display device and a liquid-crystal display device

Abstract

A substrate for a display device includes an active matrix substrate and an opposed substrate which are opposed to each other with a display medium layer interposed there between. The active matrix substrate includes a pixel electrode arranged in a matrix shape on the side of the display medium layer and the opposed substrate includes a common electrode opposing to the pixel electrode on the side of the display medium layer, wherein the substrate for a display device includes an electrode slit formed in one of the pixel electrode and the common electrode, and at least one of the electrical connecting portions of the electrode slit is provided outside of a light-blocking region.

1 . A substrate for a display device comprising an active matrix substrate and an opposed substrate which are opposed to each other with a display medium layer interposed there between, said active matrix substrate including a pixel electrode arranged in a matrix shape on the side of the display medium layer and said opposed substrate including a common electrode opposing to the pixel electrode on the side of the display medium layer,
 wherein said substrate for a display device includes an electrode slit formed in one of the pixel electrode and the common electrode; and   at least one of the electrical connecting portions of said electrode slit is provided within a light-blocking region and the position at which the at least one electrical connecting portion is placed is marked with a shape of the light-blocking component.   
     
     
         2 . The substrate for a display device according to  claim 1 , wherein said light-blocking region is formed from a metal wiring formed on the active matrix substrate. 
     
     
         3 . The substrate for a display device according to  claim 1 , wherein said light-blocking region is formed from a black matrix formed on one of the active matrix substrate and the opposed substrate. 
     
     
         4 . The substrate for a display device according to  claim 1 , wherein said light-blocking region is formed from a overlapping of a plurality of colors in a color filter formed on one of the active matrix substrate and the opposed substrate. 
     
     
         5 . The substrate for a display device according to  claim 1 , wherein said substrate for a display device is an active matrix substrate including the pixel electrode provided with the electrode slit,
 wherein said active matrix substrate includes a scanning line, a signal line, a switching device and a storage capacitor wiring on an insulating substrate and further includes an interlayer insulation film and the pixel electrode;   said switching device is provided at the intersection of the scanning line and the signal line and includes a gate electrode connected to the scanning line, a source electrode connected to the signal line and a drain extracting electrode connected to the pixel electrode;   said interlayer insulation film includes a plurality of contact holes which are connected to a plurality of capacitance electrodes placed above the storage capacitor wiring with an insulating layer interposed therebetween and connect the drain extracting electrode of the switching device to the pixel electrode; and   the electrode slit is formed between the contact holes such that they straddle the storage capacitor wiring.   
     
     
         6 . The substrate for a display device according to  claim 5 , wherein the pixel electrodes connected to the contact hole are not connected to one another. 
     
     
         7 . The substrate for a display device according to  claim 5 , wherein there are a plurality of drain extracting electrodes within a single pixel. 
     
     
         8 . The substrate for a display device according to  claim 5 , wherein the drain extracting electrode is directly connected to the capacitance electrode under the interlayer insulation film. 
     
     
         9 . The substrate for a display device according to  claim 5 , wherein the electrical connecting portion of the electrode slit exists on the drain extracting electrode. 
     
     
         10 . The substrate for a display device according to  claim 5 , wherein a plurality of signal lines near the electrode slit are placed in parallel and the respective signal lines are partially connected to one another. 
     
     
         11 . The substrate for a display device according to  claim 5 , wherein there is provided a repairing configuration for supplying a drain electric potential from an adjacent pixel to the pixel electrode provided with the electrode slit. 
     
     
         12 . The substrate for a display device according to  claim 1 , wherein said substrate for a display device is the opposed substrate including the common electrode which is provided with the electrode slit. 
     
     
         13 . The substrate for a display device according to  claim 12 , wherein said electrode slit is formed outside of the light-blocking region. 
     
     
         14 . A method for repairing a display device having short-circuiting in the substrate for a display device according to  claim 1 , wherein, in the event of occurrence of the electrical short-circuiting between the electrodes on the active matrix substrate and on the opposed substrate, the portion suffering from a failure is cut away by laser irradiation from the back surface of at least one of the substrates. 
     
     
         15 . A method for repairing a display device according to  claim 14 , wherein a fundamental harmonic wave of an yttrium-aluminum-garnet laser is used. 
     
     
         16 . A method for repairing an electrical short-circuiting in the substrate for a display device according to  claim 5 , wherein, in the event of occurrence of the electrical short-circuiting between the drain extracting electrode and the storage capacitor wiring, the portion suffering from a failure is cut away by laser irradiation from the pixel-electrode side of the active matrix substrate. 
     
     
         17 . The method for repairing the substrate for a display device according to  claim 16 , wherein a fourth harmonic wave of an yttrium-aluminum-garnet laser is used. 
     
     
         18 . A liquid crystal display device including the substrate for a display device according to  claim 1 , wherein said liquid crystal display device divides an alignment of a liquid crystal molecule by the electrode slit.