Light-emitting device

Abstract

Providing a display device or the like with a novel configuration in which the gate capacitance of a transistor connected to a scanning line is reduced. Or, providing a display device or the like with a novel configuration in which the resistance of a scanning line is reduced. Or, providing a display device or the like with a novel configuration in which pixels can be arranged with high definition. Or, providing a display device or the like with a novel configuration in which an increase in manufacturing cost is suppressed. 【Solution means】In a transistor having a first gate electrode and a second gate electrode connected to a scanning line, the first gate electrode is formed of a low-resistance metal material, and the second gate electrode is formed of a metal oxide material capable of reducing the oxygen deficiency of an oxide semiconductor layer. The first gate electrode is connected to the scanning line, and the second gate electrode is connected to a wiring to which a fixed potential is applied. ​​​​​​​​

Claims

1. The pixel portion includes a first to third transistor, a light-emitting element, a signal line, a current supply line, and wiring. The first transistor has the function of controlling the supply of current from the current supply line to the light-emitting element according to a signal corresponding to the image data input to the signal line. Either the source or the drain of the second transistor is electrically connected to the signal line. The second transistor has the function of controlling the input of a signal corresponding to the image data to the first transistor. The source or drain of the third transistor is electrically connected to the pixel electrode of the light-emitting element. The source or drain of the third transistor is a light-emitting device electrically connected to the wiring, A first conductive film having the function of a first gate electrode of the first transistor, A semiconductor film having a region positioned above the first conductive film and having a channel formation region for the first transistor, A second conductive film having a region positioned above the semiconductor film and functioning as the second gate electrode of the first transistor, A first insulating film having a region positioned above the second conductive film, A third conductive film having a region positioned above the first insulating film, A fourth conductive film having a region positioned above the first insulating film, A fifth conductive film having a region positioned above the first insulating film and electrically connected to the second conductive film, A sixth conductive film having a region positioned above the first insulating film, A seventh conductive film having a region positioned above the first insulating film and functioning as wiring, A second insulating film having a region positioned above the third conductive film, a region positioned above the fourth conductive film, a region positioned above the fifth conductive film, a region positioned above the sixth conductive film, and a region positioned above the seventh conductive film, An eighth conductive film having a region positioned above the second insulating film, electrically connected to the fourth conductive film, and functioning as the current supply line, A ninth conductive film having a region positioned above the second insulating film, electrically connected to the sixth conductive film, and functioning as the signal line, The third conductive film is electrically connected to the pixel electrode of the light-emitting element. The eighth conductive film has a region that overlaps with the seventh conductive film, The eighth conductive film has a shape that extends across at least two adjacent pixels, The ninth conductive film has a shape that extends across at least two adjacent pixels. Light-emitting device.

2. The pixel portion includes a first to third transistor, a light-emitting element, a signal line, a current supply line, and wiring. The first transistor has the function of controlling the supply of current from the current supply line to the light-emitting element according to a signal corresponding to the image data input to the signal line. Either the source or the drain of the second transistor is electrically connected to the signal line. The second transistor has the function of controlling the input of a signal corresponding to the image data to the first transistor. The source or drain of the third transistor is electrically connected to the pixel electrode of the light-emitting element. The source or drain of the third transistor is a light-emitting device electrically connected to the wiring, A first conductive film having the function of a first gate electrode of the first transistor, A semiconductor film having a region positioned above the first conductive film and having a channel formation region for the first transistor, A second conductive film having a region positioned above the semiconductor film and functioning as the second gate electrode of the first transistor, A first insulating film having a region positioned above the second conductive film, A third conductive film having a region positioned above the first insulating film, A fourth conductive film having a region positioned above the first insulating film, A fifth conductive film having a region positioned above the first insulating film and electrically connected to the second conductive film, A sixth conductive film having a region positioned above the first insulating film, A seventh conductive film having a region positioned above the first insulating film and functioning as wiring, A second insulating film having a region positioned above the third conductive film, a region positioned above the fourth conductive film, a region positioned above the fifth conductive film, a region positioned above the sixth conductive film, and a region positioned above the seventh conductive film, An eighth conductive film having a region positioned above the second insulating film, electrically connected to the fourth conductive film, and functioning as the current supply line, A ninth conductive film having a region positioned above the second insulating film, electrically connected to the sixth conductive film, and functioning as the signal line, Each of the third conductive film, the fourth conductive film, the fifth conductive film, the sixth conductive film, and the seventh conductive film has a region in contact with the second insulating film. The third conductive film is electrically connected to the pixel electrode of the light-emitting element. The eighth conductive film has a region that overlaps with the seventh conductive film, The eighth conductive film has a shape that extends across at least two adjacent pixels, The ninth conductive film has a shape that extends across at least two adjacent pixels. Light-emitting device.

3. The pixel portion includes a first to third transistor, a light-emitting element, a signal line, a current supply line, and wiring. The first transistor has the function of controlling the supply of current from the current supply line to the light-emitting element according to a signal corresponding to the image data input to the signal line. Either the source or the drain of the second transistor is electrically connected to the signal line. The second transistor has the function of controlling the input of a signal corresponding to the image data to the first transistor. The source or drain of the third transistor is electrically connected to the pixel electrode of the light-emitting element. The source or drain of the third transistor is a light-emitting device electrically connected to the wiring, A first conductive film having the function of a first gate electrode of the first transistor, A semiconductor film having a region positioned above the first conductive film and having a channel formation region for the first transistor, A second conductive film having a region positioned above the semiconductor film and functioning as the second gate electrode of the first transistor, A first insulating film having a region positioned above the second conductive film, A third conductive film having a region positioned above the first insulating film, A fourth conductive film having a region positioned above the first insulating film, A fifth conductive film having a region positioned above the first insulating film and electrically connected to the second conductive film, A sixth conductive film having a region positioned above the first insulating film, A seventh conductive film having a region positioned above the first insulating film and functioning as wiring, A second insulating film having a region positioned above the third conductive film, a region positioned above the fourth conductive film, a region positioned above the fifth conductive film, a region positioned above the sixth conductive film, and a region positioned above the seventh conductive film, An eighth conductive film having a region positioned above the second insulating film, electrically connected to the fourth conductive film, and functioning as the current supply line, A ninth conductive film having a region positioned above the second insulating film, electrically connected to the sixth conductive film, and functioning as the signal line, The third conductive film is electrically connected to the pixel electrode of the light-emitting element. The eighth conductive film has a region that overlaps with the second conductive film, The eighth conductive film has a region that overlaps with the seventh conductive film, The eighth conductive film has a shape that extends across at least two adjacent pixels, The ninth conductive film has a shape that extends across at least two adjacent pixels. Light-emitting device.

4. The pixel portion includes a first to third transistor, a light-emitting element, a signal line, a current supply line, and wiring. The first transistor has the function of controlling the supply of current from the current supply line to the light-emitting element according to a signal corresponding to the image data input to the signal line. Either the source or the drain of the second transistor is electrically connected to the signal line. The second transistor has the function of controlling the input of a signal corresponding to the image data to the first transistor. The source or drain of the third transistor is electrically connected to the pixel electrode of the light-emitting element. The source or drain of the third transistor is a light-emitting device electrically connected to the wiring, A first conductive film having the function of a first gate electrode of the first transistor, A semiconductor film having a region positioned above the first conductive film and having a channel formation region for the first transistor, A second conductive film having a region positioned above the semiconductor film and functioning as the second gate electrode of the first transistor, A first insulating film having a region positioned above the second conductive film, A third conductive film having a region positioned above the first insulating film, A fourth conductive film having a region positioned above the first insulating film, A fifth conductive film having a region positioned above the first insulating film and electrically connected to the second conductive film, A sixth conductive film having a region positioned above the first insulating film, A seventh conductive film having a region positioned above the first insulating film and functioning as wiring, A second insulating film having a region positioned above the third conductive film, a region positioned above the fourth conductive film, a region positioned above the fifth conductive film, a region positioned above the sixth conductive film, and a region positioned above the seventh conductive film, An eighth conductive film having a region positioned above the second insulating film, electrically connected to the fourth conductive film, and functioning as the current supply line, A ninth conductive film having a region positioned above the second insulating film, electrically connected to the sixth conductive film, and functioning as the signal line, Each of the third conductive film, the fourth conductive film, the fifth conductive film, the sixth conductive film, and the seventh conductive film has a region in contact with the second insulating film. The third conductive film is electrically connected to the pixel electrode of the light-emitting element. The eighth conductive film has a region that overlaps with the second conductive film, The eighth conductive film has a region that overlaps with the seventh conductive film, The eighth conductive film has a shape that extends across at least two adjacent pixels, The ninth conductive film has a shape that extends across at least two adjacent pixels. Light-emitting device.

5. In any one of claims 1 to 4, The two adjacent pixels are arranged in a direction that intersects with the scan line, which is electrically connected to at least one of the gate electrodes of the second transistor and the gate electrode of the third transistor. Light-emitting device.

6. In any one of claims 1 to 5, Each of the third to seventh conductive films comprises a first film containing titanium or titanium nitride, a second film containing aluminum on the first film, and a third film containing titanium or titanium nitride on the second film. Light-emitting device.

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