Display device and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHidetomo KOBAYASHI, Kouhei TOYOTAKA
Life of this patent
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Abstract
A display device that can be easily and more flexibly designed is provided. The display device includes a pixel circuit and a driver circuit in a display portion. The driver circuit includes a plurality of pulse output circuits. Each of the plurality of pulse output circuits has a function of driving a gate line. The pixel circuit is electrically connected to the gate line. Each of the plurality of pulse output circuits includes a first transistor. The pixel circuit includes a second transistor. A layer including the second transistor is over a layer including the first transistor, and the first transistor and the second transistor overlap with each other.
Claims9
(canceled)
A display device comprising:
- a display portion over a substrate,
- wherein the display portion comprises a pixel comprising a light-emitting element,
- wherein the display portion comprises:
- a first semiconductor layer comprising a channel formation region of a first transistor;
- a first insulating layer over the first semiconductor layer;
- a first conductive layer over the first insulating layer, the first conductive layer comprising a region which functions as a gate electrode of a second transistor;
- a second insulating layer over the first conductive layer, the second insulating layer comprising a region which functions as a gate insulating layer of the second transistor;
- a second semiconductor layer comprising a channel formation region of the second transistor;
- a second conductive layer over the second semiconductor layer, the second conductive layer comprising a region which functions as one of a source electrode and a drain electrode of the second transistor;
- a third conductive layer over the second semiconductor layer, the third conductive layer comprising a region which functions as the other of the source electrode and the drain electrode of the second transistor;
- and
- a third insulating layer over the second conductive layer and the third conductive layer,
- wherein the light-emitting element is positioned over the third insulating layer,
- wherein one of the second conductive layer and the third conductive layer comprises a region which functions as one electrode of a capacitor, and
- wherein the second semiconductor layer does not comprise a region overlapping with the first semiconductor layer.
A display device comprising:
- a display portion over a substrate,
- wherein the display portion comprises a pixel comprising a light-emitting element, and
- wherein the display portion comprises:
- a first semiconductor layer comprising a channel formation region of a first transistor;
- a first insulating layer over the first semiconductor layer;
- a first conductive layer over the first insulating layer, the first conductive layer comprising a region which functions as a gate electrode of a second transistor;
- a second insulating layer over the first conductive layer, the second insulating layer comprising a region which functions as a gate insulating layer of the second transistor;
- a second semiconductor layer comprising a channel formation region of the second transistor;
- a second conductive layer over the second semiconductor layer, the second conductive layer comprising a region which functions as one of a source electrode and a drain electrode of the second transistor;
- a third conductive layer over the second semiconductor layer, the third conductive layer comprising a region which functions as the other of the source electrode and the drain electrode of the second transistor;
- and
- a third insulating layer over the second conductive layer and the third conductive layer.
Dependencies are inferred from the claim text.