Display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHajime Kimura, Atsushi Umezaki
Life of this patent
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Abstract
An object is to provide a display device that performs accurate display. A circuit is formed using a transistor that includes an oxide semiconductor and has a low off-state current. A precharge circuit or an inspection circuit is formed in addition to a pixel circuit. The off-state current is low because the oxide semiconductor is used. Thus, it is not likely that a signal or voltage is leaked in the precharge circuit or the inspection circuit to cause defective display. As a result, a display device that performs accurate display can be provided.
Claims6
A display device comprising a pixel, the pixel comprising:
- a first transistor including a first oxide semiconductor in a first channel formation region;
- a second transistor including a second oxide semiconductor in a second channel formation region;
- a capacitor;
- and
- a light-emitting element,
- wherein one of a source and a drain of the first transistor is electrically connected to a data signal line,
- wherein the other of the source and the drain of the first transistor is electrically connected to a gate of the second transistor, and to one electrode of the capacitor,
- wherein one of a source and a drain of the second transistor is electrically connected to a power supply line,
- wherein the other of the source and the drain of the second transistor is electrically connected to the light-emitting element, and to the other electrode of the capacitor, and
- wherein each of the first oxide semiconductor and the second oxide semiconductor has an off-state current of 100 aA/μm or less.
A display device comprising a pixel, the pixel comprising:
- a first transistor including a first oxide semiconductor in a first channel formation region;
- a second transistor including a second oxide semiconductor in a second channel formation region;
- a capacitor;
- and
- a light-emitting element,
- wherein one of a source and a drain of the first transistor is electrically connected to a data signal line,
- wherein the other of the source and the drain of the first transistor is electrically connected to a gate of the second transistor, and to one electrode of the capacitor,
- wherein a gate of the first transistor is electrically connected to a gate signal line,
- wherein one of a source and a drain of the second transistor is electrically connected to a power supply line,
- wherein the other of the source and the drain of the second transistor is electrically connected to the light-emitting element, and to the other electrode of the capacitor, and
- wherein each of the first oxide semiconductor and the second oxide semiconductor has an off-state current of 100 aA/μm or less.
Dependencies are inferred from the claim text.