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.
Claims24
A display device comprising:
- a pixel portion including a plurality of pixels;
- and
- a circuit,
- wherein the circuit includes a plurality of first transistors,
- wherein each of the plurality of pixels includes a second transistor and a display element,
- wherein gates of the plurality of first transistors are electrically connected to each other,
- wherein at least one of first terminals of the plurality of first transistors is electrically connected to a first wiring, at least another one of the first terminals of the plurality of first transistors is electrically connected to a second wiring, and at least another one of the first terminals of the plurality of first transistors is electrically connected to a third wiring,
- wherein all of second terminals of the plurality of first transistors are electrically connected to the pixel portion,
- wherein the gates of the plurality of first transistors are in a floating state, and
- wherein each of the plurality of first transistors and the second transistor includes an oxide semiconductor.
A display device comprising:
- a pixel portion including a plurality of pixels;
- and
- a circuit,
- wherein the circuit includes a plurality of first transistors,
- wherein each of the plurality of pixels includes a second transistor and a display element,
- wherein at least one of gates of the plurality of first transistors is electrically connected to a first wiring and at least another one of the gates of the plurality of first transistors is electrically connected to a second wiring,
- wherein first terminals of the plurality of first transistors are electrically connected to each other,
- wherein all of second terminals of the plurality of first transistors are electrically connected to the pixel portion,
- wherein the first terminals of the plurality of first transistors are in a floating state, and
- wherein each of the plurality of first transistors and the second transistor includes an oxide semiconductor.
A display device comprising:
- a pixel portion including a plurality of pixels;
- and
- a circuit,
- wherein the circuit includes a plurality of first transistors,
- wherein each of the plurality of pixels includes a second transistor and a display element,
- wherein at least one of gates of the plurality of first transistors is electrically connected to a first wiring and at least another one of the gates of the plurality of first transistors is electrically connected to a second wiring,
- wherein at least one of first terminals of the plurality of first transistors is electrically connected to a third wiring and at least another one of the first terminals of the plurality of first transistors is electrically connected to a fourth wiring,
- wherein all of second terminals of the plurality of first transistors are electrically connected to the pixel portion,
- wherein each of the plurality of first transistors and the second transistor includes an oxide semiconductor, and
- wherein an off-state current per channel width of 1 μm of each of the plurality of first transistors and the second transistor is 10 zA/μm or less.
Dependencies are inferred from the claim text.