Liquid crystal display device

Abstract

A first insulating film is formed between a pixel electrode and a thin film transistor. The pixel electrode is connected to a conductive electrode of the thin film transistor via a contact hole formed in the first insulating film. The common electrode is formed so as to overlap a data signal line in plan view, and a metal wiring, which is electrically connected to the common electrode, is formed so as to overlap at least a part of the contact hole in plan view.

What is claimed is: 
     
         1 . A liquid crystal display device, comprising:
 a first substrate on a display surface side and a second substrate on a rear surface side, the first substrate and the second substrate being placed so as to be opposed to each other with liquid crystal interposed therebetween,   the second substrate comprising:
 a plurality of gate signal lines formed thereon; 
 a plurality of data signal lines formed thereon; 
 a plurality of pixel electrodes and a plurality of thin film transistors formed thereon, which are provided correspondingly to a plurality of pixels formed in a row direction in which the plurality of gate signal lines extend and in a column direction in which the plurality of data signal lines extend; 
 a common electrode formed thereon, which is provided on the display surface side so as to be opposed to the plurality of pixel electrodes; 
 a plurality of metal wirings formed thereon, which are electrically connected to the common electrode; and 
 a first insulating film formed between the plurality of pixel electrodes and the plurality of thin film transistors, 
   wherein each of the plurality of pixel electrodes is connected to a conductive electrode of each of the plurality of thin film transistors via a contact hole formed in the first insulating film,   wherein the common electrode is formed so as to overlap the data signal line in plan view, and   wherein the metal wiring is formed so as to overlap at least a part of the contact hole in plan view.   
     
     
         2 . The liquid crystal display device according to  claim 1 , further comprising a second insulating film formed on the first insulating film between the plurality of pixel electrodes and the plurality of thin film transistors,
 wherein the contact hole is formed in the first insulating film and in the second insulating film, and   wherein each of the plurality of metal wirings is formed so as to overlap, in plan view, the contact hole and a semiconductor layer which forms the thin film transistor.   
     
     
         3 . The liquid crystal display device according to  claim 2 , wherein the second insulating film comprises an organic material. 
     
     
         4 . The liquid crystal display device according to  claim 1 , wherein the metal wiring is formed so as to further overlap the gate signal line in plan view. 
     
     
         5 . The liquid crystal display device according to  claim 4 , wherein the gate signal line has a notch, and
 wherein the contact hole is located within the notch in plan view.   
     
     
         6 . The liquid crystal display device according to  claim 1 , further comprising a third insulating film formed on the plurality of pixel electrodes,
 wherein the common electrode overlaps the pixel electrode via the third insulating film,   wherein the metal wiring overlaps the contact hole via the third insulating film, and   wherein the metal wiring is formed one of directly above and directly below the common electrode.   
     
     
         7 . The liquid crystal display device according to  claim 1 , further comprising a spacer for maintaining a distance between the first substrate and the second substrate,
 wherein the spacer is provided so as to overlap the metal wiring in plan view.   
     
     
         8 . The liquid crystal display device according to  claim 1 , further comprising:
 a plurality of touch detection electrodes extending in the column direction; and   a plurality of drive electrodes extending in the row direction,   wherein each of the plurality of touch detection electrodes and each of the plurality of drive electrodes form an electrostatic capacitance,   wherein the each of the plurality of touch detection electrodes outputs a detection signal related to a drive signal which is applied to the each of the plurality of drive electrodes, and   wherein the each of the plurality of drive electrodes comprises the common electrode.