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.
Claims7
(canceled)
A method of operation of 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 gates of the plurality of second transistors are electrically connected to each other,
- wherein first terminals of each of the plurality of first transistors are electrically connected to a wiring,
- wherein second terminals of each of the plurality of first transistors are electrically connected to the pixel portion,
- wherein each of the plurality of pixels is electrically connected to the wiring via one of the plurality of the first transistors,
- wherein a predetermined potential is supplied to the wiring,
- wherein a frame period comprises a first period and a second period longer than the first period,
- wherein in the first period a first high voltage is supplied to the gates of the second transistors,
- wherein in the second period a first low voltage is supplied to the gates of the second transistors,
- wherein the first period comprises a third period and a fourth period following the third period,
- wherein during the third period a second high voltage is supplied to the gates of the first transistors,
- wherein during the fourth period a second low voltage is supplied to the gates of the first transistor, and
- wherein during the fourth period a potential corresponding to a video signal is supplied to the pixel.
Dependencies are inferred from the claim text.