Display device

Abstract

A display device includes lead lines that extend from a display area, and electrically connect video signal lines or scanning signal lines within a display area, and a driver circuit or a terminal portion that receives an output from the driver circuit; an insulating film that is formed in an upper layer of the lead lines and covers the lead lines; and a conductive film that is formed in an upper layer of the insulating film. The lead lines include a plurality of first lead lines that start from the driver circuit or the terminal portion, and arrive at the scanning signal lines or the video signal lines, and a plurality of second lead lines that are smaller in wiring resistance than the first lead lines. At least the first lead lines overlap with the conductive film through the insulating film.

1 . A display device comprising:
 a plurality of scanning signal lines and a plurality of video signal lines in a display area in which one pixel is configured by an area surrounded by adjacent two of the plurality of scanning signal lines and adjacent two of the plurality of video signal lines;   one of a semiconductor chip for a driver circuit and a terminal portion for being connected to a flexible printed board, provided in a peripheral area next to the display area;   a plurality of lead lines that electrically connect one group of the plurality of scanning signal lines and the plurality of video signal lines to the one of the semiconductor chip and the terminal portion;   an insulating film over the plurality of lead lines to cover the plurality of lead lines; and   a conductive film over the insulating film,   wherein   the plurality of lead lines include a first lead line and a second lead line, the second lead line having a lower wiring resistance from the one group of the plurality of scanning signal lines and the plurality of video signal lines to the one of the semiconductor chip and the terminal portion than that of the first lead line,   the conductive film includes a first conductive film and a second conductive film, the first conductive film and the second conductive film being electrically connected with each other through a contact hole,   the first conductive film overlaps with the one group of the plurality of scanning signal lines and the plurality of video signal lines in the display area, and   the second conductive film overlaps with the first lead line in the peripheral area.   
     
     
         2 . The display device according to  claim 1 , wherein the first lead line overlaps with the contact hole in the peripheral area. 
     
     
         3 . The display device according to  claim 1 , wherein the first conductive film and the second conductive film are configured to be supplied with a common signal. 
     
     
         4 . The display device according to  claim 1 , wherein a distance between two points of adjacent two of the lead lines is wider as the two points is closer to the display area from the one of the semiconductor chip and the terminal portion. 
     
     
         5 . The display device according to  claim 1 , wherein the second lead line has a smaller wiring length than the first lead line. 
     
     
         6 . The display device according to  claim 1 , wherein the first lead line and the second lead line are made of the same conductive film material. 
     
     
         7 . The display device according to  claim 1 , wherein the second lead line has a smaller resistance value per unit length than the first lead line. 
     
     
         8 . The display device according to  claim 1 , wherein the first lead line and the second lead line are formed in different layers. 
     
     
         9 . The display device according to  claim 1 , wherein the first conductive film is a transparent conductive film that prevents an electric field from being leaked to an external. 
     
     
         10 . The display device according to  claim 1 , wherein
 the insulating film includes a first insulating film that is formed in contact with surfaces of the plurality of lead lines, and a second insulating film that is formed over the first insulating film,   the second conductive film is opposed to the first lead line through the first insulating film, and   the contact hole is formed in the second insulating film.   
     
     
         11 . The display device according to  claim 10 , wherein the second conductive film is formed in the peripheral area, and the first conductive film prevents an electric field from being leaked to an external. 
     
     
         12 . The display device according to  claim 1 , further comprising:
 a first substrate on which the plurality of scanning signal lines and the plurality of video signal lines are formed, and a second substrate that is opposed to the first substrate through a liquid crystal layer, to constitute a liquid crystal panel; and   a backlight device that is arranged on a rear surface side of the liquid crystal display panel, and delivers a backlight.