Patent ID: 11869453
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 1:
2. A display device comprising:
a substrate;
a first insulating layer comprising silicon oxide over the substrate;
a second insulating layer comprising silicon nitride over the substrate;
a semiconductor layer comprising polycrystalline silicon, the semiconductor layer being over the first insulating layer and the second insulating layer;
a third insulating layer comprising silicon oxide and functioning as a first gate insulating layer, the third insulating layer being over the semiconductor layer;
a fourth insulating layer comprising silicon nitride and functioning as a second gate insulating layer, the fourth insulating layer being over the third insulating layer;
a gate electrode comprising molybdenum over the fourth insulating layer;
an interlayer insulating film comprising one of silicon oxide and silicon nitride over the gate electrode;
a first conductive film provided in an opening of the interlayer insulating film, the first conductive film having a stacked-layer structure comprising aluminum and titanium;
a fifth insulating layer 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 interlayer insulating film;
a second conductive film functioning as a pixel electrode over and electrically connected to the first conductive film through an opening of the fifth insulating layer;
a light-blocking film overlapping with the semiconductor layer, the gate electrode, and the pixel electrode;
a pair of LDD regions in the semiconductor layer; and
a liquid crystal display element,
wherein the light-blocking film comprises a metal,
wherein a bottom surface of the fifth insulating layer is provided below a top surface of the gate electrode,
wherein the second conductive film comprises a region overlapping with 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,
wherein an end portion of the gate electrode has a tapered shape, and
wherein the light-blocking film overlaps with the opening of the interlayer insulating film.