Display device

Abstract

A display device with less light leakage and excellent contrast is provided. A display device having a high aperture ratio and including a large-capacitance capacitor is provided. A display device in which wiring delay due to parasitic capacitance is reduced is provided. A display device includes a transistor over a substrate, a pixel electrode connected to the transistor, a signal line electrically connected to the transistor, a scan line electrically connected to the transistor and intersecting with the signal line, and a common electrode overlapping with the pixel electrode and the signal line with an insulating film provided therebetween. The common electrode includes stripe regions extending in a direction intersecting with the signal line.

What is claimed is: 
     
         1 . A liquid crystal display device comprising:
 a plurality of pixels arranged in matrix, at least one of the plurality of pixels comprising;
 a semiconductor film including a channel region of a transistor over a scan line; 
 a pixel electrode electrically connected to the semiconductor film; 
 a common electrode overlapping the pixel electrode and including an opening; and 
 a signal line and a conductive layer, each electrically connected to the semiconductor film, 
 wherein the common electrode does not overlap the channel region, 
 wherein the opening has a first portion extending in a first direction, and a second portion extending in a second direction crossing the first direction, 
 wherein, in a plan view, at least a part of the first portion of the opening extending in the first direction and at least a part of the second portion of the opening extending in the second direction are located between the signal line and an end of the pixel electrode facing the signal line, 
 wherein the conductive layer has a first region extending in parallel or substantially parallel with the scan line, and a second region extending in parallel or substantially parallel with the signal line and overlapping the scan line, and 
 wherein the first region of the conductive layer overlaps an end of the pixel electrode facing the scan line. 
   
     
     
         2 . The liquid crystal display device according to  claim 1 , wherein a channel length direction of the transistor extends in parallel or substantially parallel with the scan line. 
     
     
         3 . A liquid crystal display device comprising:
 a plurality of pixels arranged in matrix, at least one of the plurality of pixels comprising;
 a semiconductor film including a channel region of a transistor over a scan line; 
 a pixel electrode electrically connected to the semiconductor film; 
 a common electrode overlapping the pixel electrode and including an opening; and 
 a signal line and a conductive layer, each electrically connected to the semiconductor film, 
 wherein the common electrode does not overlap the channel region, 
 wherein the opening has a first portion extending in a first direction, and a second portion extending in a second direction crossing the first direction, 
 wherein, in a plan view, at least a part of the first portion of the opening extending in the first direction and at least a part of the second portion of the opening extending in the second direction are located between the signal line and an end of the pixel electrode facing the signal line, 
 wherein the conductive layer has a first region extending in parallel or substantially parallel with the scan line, and a second region extending in parallel or substantially parallel with the signal line and overlapping the scan line, 
 wherein the first region of the conductive layer overlaps an end of the pixel electrode facing the scan line, and 
 wherein the second region of the conductive layer does not overlap the common electrode. 
   
     
     
         4 . The liquid crystal display device according to  claim 3 , wherein a channel length direction of the transistor extends in parallel or substantially parallel with the scan line.