Semiconductor device, display device, and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
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Abstract
A display device includes a load, a transistor for controlling a current value supplied to the load, a capacitor, a first wiring, a second wiring, and first to fourth switches. Variations in the current value caused by variations in the threshold voltage of the transistor can be suppressed through the steps of: (1) holding the threshold voltage of the transistor in the storage capacitor, (2) inputting a potential in accordance with a video signal, and (3) holding a voltage that is the sum of the threshold voltage and the potential in accordance with the video signal, in the storage capacitor. Accordingly, a desired current can be supplied to the load such as a light emitting element.
Claims1
A semiconductor device comprising:
- a transistor for controlling a current supplied to a pixel electrode;
- a storage capacitor for holding a gate-source voltage of the transistor;
- a first circuit for controlling an input of signal from a fourth wiring to a gate electrode of the transistor;
- a second circuit for controlling an input of a first electrical potential from a second wiring to the gate electrode of the transistor;
- a third circuit for controlling an input of a second electrical potential from a third wiring to a source electrode of the transistor,
- wherein a drain electrode of the transistor is electrically connected to a first wiring, and the source electrode of the transistor is electrically connected to the pixel electrode.
Dependencies are inferred from the claim text.