Display device and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsSusumu Kawashima, Naoto Kusumoto
Life of this patent
Estimating the term…
Abstract
A display device capable of improving image quality with low power consumption is provided. A storage node is provided in each pixel and a first signal can be held in the storage node. A second signal is added to the first signal by capacitive coupling to generate a third signal. A display element operates in response to the third signal. Thus, regardless of the output voltage of a driver that supplies data, a high voltage can be supplied to the display element. Consequently, even a display element that requires a relatively high voltage for operation can operate with low power consumption.
Claims17
A display device comprising a pixel, the pixel comprising:
- a first transistor, a second transistor, a third transistor, a first capacitor, and a circuit block comprising a light-emitting element,
- wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one electrode of the first capacitor,
- wherein the other electrode of the first capacitor is electrically connected to one of a source and a drain of the third transistor and the circuit block,
- wherein the other of the source and the drain of the first transistor and the other of the source and the drain of the third transistor are electrically connected to a first wiring,
- wherein a gate of the second transistor and a gate of the third transistor are electrically connected to a second wiring, and
- wherein the light-emitting element has a tandem structure where two or more light-emitting layers are connected in series.
A display device comprising a pixel, the pixel comprising:
- a first transistor, a second transistor, a third transistor, a first capacitor, a light-emitting element, a fourth transistor, and a second capacitor,
- wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one electrode of the first capacitor,
- wherein the other electrode of the first capacitor is electrically connected to one of a source and a drain of the third transistor,
- wherein the other of the source and the drain of the first transistor and the other of the source and the drain of the third transistor are electrically connected to a first wiring,
- wherein a gate of the second transistor and a gate of the third transistor are electrically connected to a second wiring,
- wherein a gate of the fourth transistor and one electrode of the second capacitor are electrically connected to the other electrode of the first capacitor,
- wherein one of a source and a drain of the fourth transistor is electrically connected to the light-emitting element, and
- wherein the light-emitting element has a tandem structure where two or more light-emitting layers are connected in series.
A display device comprising a pixel, the pixel comprising:
- a first transistor, a second transistor, a third transistor, a first capacitor, a light-emitting element, a fourth transistor, a second capacitor, and a fifth transistor,
- wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one electrode of the first capacitor,
- wherein the other electrode of the first capacitor is electrically connected to one of a source and a drain of the third transistor,
- wherein the other of the source and the drain of the first transistor and the other of the source and the drain of the third transistor are electrically connected to a first wiring,
- wherein a gate of the second transistor and a gate of the third transistor are electrically connected to a second wiring,
- wherein a gate of the fourth transistor and one electrode of the second capacitor are electrically connected to the other electrode of the first capacitor,
- wherein one of a source and a drain of the fourth transistor is electrically connected to one of a source and a drain of the fifth transistor and the other electrode of the second capacitor,
- wherein the other of the source and the drain of the fifth transistor is electrically connected to the light-emitting element, and
- wherein the light-emitting element has a tandem structure where two or more light-emitting layers are connected in series.
Dependencies are inferred from the claim text.