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US 8,138,500 B2Granted
Display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorKunio Hosoya
Life of this patent
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Abstract
In a pixel portion, a scan signal line and an auxiliary capacitor line are formed using a second conductive film, and a data signal line is formed using a first conductive film. In a TFT portion, a gate electrode is formed using the first conductive film and electrically connected to the scan signal line formed using the second conductive film through an opening in a gate insulating film. Further, a source electrode and a drain electrode are formed using the second conductive film. In the auxiliary capacitor portion, the auxiliary capacitor line formed using the second conductive film serves as a lower electrode, the pixel electrode serves as an upper electrode, and the passivation film used as a dielectric film is interposed between the capacitor electrodes.
Claims12
A display device comprising:
- a gate electrode over a light-transmitting substrate, wherein the gate electrode comprises a first conductive material;
- a data signal line over the light-transmitting substrate, wherein the data signal line comprises the first conductive material and extends in one direction;
- a first insulating film over the gate electrode and the data signal line;
- a semiconductor film over the first insulating film;
- a source electrode over the first insulating film and the semiconductor film, wherein the source electrode comprises a second conductive material;
- a drain electrode over the first insulating film and the semiconductor film, wherein the drain electrode comprises the second conductive material;
- a scan signal line over the first insulating film, wherein the scan signal line comprises the second conductive material and extends in a direction intersecting with the one direction;
- an auxiliary capacitor line over the first insulating film, wherein the auxiliary capacitor line comprises the second conductive material and extends in the direction intersecting with the one direction;
- a second insulating film over the first insulating film, the source electrode and the drain electrode, the scan signal line and the auxiliary capacitor line;
- a third insulating film having an opening over the second insulating film;
- and
- a pixel electrode over the third insulating film , the pixel electrode being in contact with a portion of the second insulating film in the opening,
- wherein one of the source electrode and the drain electrode is electrically connected to the semiconductor film and the data signal line,
- wherein the other of the source electrode and the drain electrode is electrically connected to the semiconductor film and the pixel electrode,
- wherein the gate electrode is electrically connected to the scan signal line;
- and
- wherein the auxiliary capacitor line and the pixel electrode are included in an auxiliary capacitor portion where the portion of the second insulating film is used as a dielectric film.
14 more elements
A display device comprising:
- a gate electrode over a light-transmitting substrate, wherein the gate electrode comprises a first conductive material;
- a data signal line over the light-transmitting substrate, wherein the data signal line comprises the first conductive material and extends in one direction;
- a first insulating film over the gate electrode and the data signal line;
- a microcrystalline semiconductor film over the first insulating film;
- a buffer layer over the microcrystalline semiconductor film and has a portion that is recessed when seen in cross section;
- a first impurity semiconductor film and a second impurity semiconductor film, to which an impurity element imparting one conductivity type is added, and which are provided over the buffer layer;
- a source electrode over the first insulating film, the first impurity semiconductor film and the second impurity semiconductor film, wherein the source electrode comprises a second conductive material;
- a drain electrode over the first insulating film, the first impurity semiconductor film and the second impurity semiconductor film, wherein the drain electrode comprises a second conductive material;
- a scan signal line over the first insulating film, wherein the scan signal line comprises the second conductive material and extends in a direction intersecting with the one direction;
- an auxiliary capacitor line over the first insulating film, wherein the auxiliary capacitor line comprises the second conductive material and extends in the direction intersecting with the one direction;
- a second insulating film over the first insulating film, the source electrode and the drain electrode, the scan signal line and the auxiliary capacitor line;
- a third insulating film having an opening over the second insulating film;
- and
- a pixel electrode over the third insulating film, the pixel electrode being in contact with a portion of the second insulating film in the opening,
- wherein one of the source electrode and the drain electrode is electrically connected to the first impurity semiconductor film and the data signal line,
- wherein the other of the source electrode and the drain electrode is electrically connected to the second impurity semiconductor film and the pixel electrode, and
- wherein the gate electrode is electrically connected to the scan signal line;
- and
- wherein the auxiliary capacitor line and the pixel electrode are included in an auxiliary capacitor portion where the portion of the second insulating film is used as a dielectric film.
16 more elements
Dependencies are inferred from the claim text.