Patent ID: 8563982

Claim:
A liquid crystal display device comprising a pixel electrode in an area surrounded by scan lines extending in a first direction and arranged in a second direction and by image signal lines extending in the second direction and arranged in the first direction, wherein the pixel electrode is supplied with an image signal from the image signal line through a TFT, wherein the TFT includes a semiconductor layer having a channel portion, a drain portion formed on the side of the image signal line, and a source portion formed on the side of the pixel electrode, wherein a gate insulating film is formed so as to cover the semiconductor layer, wherein a gate electrode is formed on the gate insulating film above the channel portion, wherein a first interlayer insulating film is formed so as to cover the gate electrode, wherein the image signal line is provided on the first interlayer insulating film, wherein an inorganic passivation film and an organic passivation film are formed in this order so as to cover the image signal line, wherein a common electrode is formed on the organic passivation film, wherein a second interlayer insulating film is formed on the common electrode, wherein the pixel electrode having a slit is formed on the second interlayer insulating film, wherein a portion of the image signal line connected to the drain portion of the TFT has a width which is greater than a width of an other portion of the image signal line, wherein the image signal line is connected in the greater width portion to the drain portion through a contact hole, wherein a through hole is formed in the second interlayer insulating film in the wide portion of the image signal line, and wherein the diameter of the through hole is greater than the diameter of the contact hole.