Display device comprising a transistor with LDD regions

A display device comprising:

• a glass substrate;
• a first insulating layer comprising silicon oxide over the glass substrate;
• a second insulating layer comprising silicon nitride over the glass substrate;
• a semiconductor layer comprising polysilicon over the first insulating layer and the second insulating layer;
• a third insulating layer, provided over the semiconductor layer, comprising silicon oxide and functioning as a first gate insulating layer;
• a fourth insulating layer, provided over the third insulating layer, comprising silicon nitride and functioning as a second gate insulating layer;
• a gate electrode comprising molybdenum over the fourth insulating layer;
• an insulating interlayer film comprising any one of silicon oxide and silicon nitride over the gate electrode;
• a first conductive film provided in an opening of the insulating interlayer film, the first conductive film having a stacked-layer structure comprising aluminum and titanium;
• a fifth insulating film comprising a resin over and in contact with side surfaces and a top surface of the first conductive film and over and in contact with the insulating interlayer film;
• a second conductive film functioning as a pixel electrode over and electrically connected to the first conductive film through an opening provided in the fifth insulating film;
• and
• a light-blocking film overlapping the semiconductor layer, the gate electrode, and the pixel electrode,
• wherein the light-blocking film comprises a metal,
• wherein a bottom surface of the fifth insulating film is provided below a top surface of the gate electrode,
• wherein the second conductive film comprises a region overlapping the semiconductor layer,
• wherein the gate electrode comprises a region not overlapping with the second conductive film,
• wherein the second conductive film comprises indium tin oxide,
• wherein the gate electrode overlaps with a channel region of the semiconductor layer, and
• wherein the gate electrode has a tapered shape.