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US 12,007,656 B2Granted
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.
Claims3
A display device comprising:
- a pixel portion including a plurality of first transistors;
- and
- a circuit including a plurality of second transistors, the circuit being configured to inspect whether the plurality of the first transistors normally operate or not,
- wherein channel formation regions of the plurality of the first transistors and the plurality of the second transistors include oxide semiconductor,
- wherein gate electrodes of the plurality of the second transistors are electrically connected to a first wiring,
- wherein the first wiring includes at least three lines, and signals are configured to be supplied to the at least three lines at different timings,
- wherein source or drain electrodes of the plurality of the second transistors are electrically connected to a second wiring,
- wherein a channel width of the plurality of the second transistors is larger than a channel width of the plurality of the first transistors, and
- wherein an off-state current per channel width of 1 μm of the plurality of the first transistors and the plurality of the second transistors is 100 aA or less.
6 more elements
Dependencies are inferred from the claim text.