Light-emitting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHiroyuki Miyake
Life of this patent
Estimating the term…
Abstract
To provide a light-emitting device in which variation in luminance among pixels caused by variation in threshold voltage of transistors can be suppressed. The light-emitting device includes a transistor including a first gate and a second gate overlapping with each other with a semiconductor film therebetween, a first capacitor maintaining a potential difference between one of a source and a drain of the transistor and the first gate, a second capacitor maintaining a potential difference between one of the source and the drain of the transistor and the second gate, a switch controlling conduction between the second gate of the transistor and a wiring, and a light-emitting element to which drain current of the transistor is supplied.
Claims19
A light-emitting device comprising:
- a first transistor comprising a first gate, a second gate and a semiconductor film between the first gate and the second gate;
- a first capacitor configured to hold a potential difference between one of a source and a drain of the first transistor and the first gate of the first transistor;
- a second capacitor configured to hold a potential difference between the one of the source and the drain of the first transistor and the second gate of the first transistor;
- a first switch configured to control connection between the second gate of the first transistor and a wiring;
- a second switch configured to control connection between the first gate of the first transistor and the one of the source and the drain of the first transistor;
- and
- a light-emitting element to which drain current of the first transistor is supplied.
A light-emitting device comprising:
- a first transistor comprising a first gate, a second gate and a semiconductor film between the first gate and the second gate;
- a first capacitor, wherein a first electrode of the first capacitor is electrically connected to the first gate of the first transistor, and a second electrode of the first capacitor is electrically connected to one of a source and a drain of the first transistor;
- a second capacitor, wherein a first electrode of the second capacitor is electrically connected to the second gate of the first transistor, and a second electrode of the second capacitor is electrically connected to the one of the source and the drain of the first transistor;
- a first switch, wherein a first terminal of the first switch is electrically connected to the second gate of the first transistor, and a second terminal of the first switch is electrically connected to a wiring;
- a second switch, wherein a first terminal of the second switch is electrically connected to the first gate of the first transistor, and a second terminal of the second switch is electrically connected to the one of the source and the drain of the first transistor;
- and
- a light-emitting element electrically connected to the one of the source and the drain of the first transistor.
A light-emitting device comprising:
- a first transistor comprising a first gate, a second gate and a semiconductor film between the first gate and the second gate;
- a first capacitor, wherein a first electrode of the first capacitor is electrically connected to the first gate of the first transistor, and a second electrode of the first capacitor is electrically connected to one of a source and a drain of the first transistor;
- a second capacitor, wherein a first electrode of the second capacitor is electrically connected to the second gate of the first transistor, and a second electrode of the second capacitor is electrically connected to the one of the source and the drain of the first transistor;
- a light-emitting element electrically connected to the one of the source and the drain of the first transistor;
- a first switch, wherein a first terminal of the first switch is electrically connected to the second gate of the first transistor, and a second terminal of the first switch is electrically connected to a wiring;
- a second switch, wherein a first terminal of the second switch is electrically connected to the first gate of the first transistor, and a second terminal of the second switch is electrically connected to the light-emitting element;
- a third switch electrically connected to the first gate of the first transistor;
- and
- a fourth switch electrically connected to the light-emitting element.
Dependencies are inferred from the claim text.