Back to results
US 9,286,830 B2Granted
Display apparatus
AssigneeJoled Inc.
InventorHitoshi Tsuge
Life of this patent
Estimating the term…
Abstract
A pixel circuit has a first capacitor having a first terminal connected with a gate of a driving transistor; a second capacitor connected between a second terminal of the first capacitor and a source of the driving transistor; a first switch applying a reference voltage to a node at which the first capacitor and the second capacitor are connected; a second switch supplying an image signal voltage to the gate of the driving transistor; a third switch supplying an initialization voltage to a drain of the driving transistor and a fourth switch supplying current to the drain of the transistor for emitting light from the current light emitting device.
Claims10
A display apparatus having a plurality of arrayed pixel circuits, each of the pixel circuits comprising:
- a current light emitting device;
- a driving transistor supplying current to the current light emitting device;
- a first capacitor having a first terminal connected to a gate of the driving transistor;
- a second capacitor connected between a second terminal of the first capacitor and a source of the driving transistor;
- a first switch applying a reference voltage to a node at which the first capacitor and the second capacitor are connected;
- a second switch supplying an image signal voltage to the gate of the driving transistor;
- a third switch supplying an initialization voltage to a drain of the driving transistor;
- a fourth switch supplying current to the drain of the driving transistor for emitting light from the current light emitting device, and
- a fifth switch applying the reference voltage to the gate of the driving transistor,
- wherein each of the pixel circuits is driven to have:
- an initialization period for charging the second capacitor to a predetermined voltage;
- a threshold detecting period for detecting a threshold voltage of the driving transistor following the initialization period;
- a writing period for writing the image signal voltage to the first capacitor following the threshold detecting period;
- and a luminescence period for causing the current light emitting device to emit light following the writing period.
11 more elements
A display apparatus having a plurality of arrayed pixel circuits, each of the pixel circuits comprising:
- a current light emitting device;
- a driving transistor supplying current to the current light emitting device;
- a first capacitor having a first terminal connected to a gate of the driving transistor;
- a second capacitor connected between a second terminal of the first capacitor and a source of the driving transistor;
- a first switch applying a reference voltage to a node to which the first capacitor and the second capacitor are connected;
- a second switch supplying an image signal voltage to the gate of the driving transistor, and
- a fifth switch applying the reference voltage to the gate of the driving transistor,
- wherein the display apparatus further comprising:
- a third switch supplying an initialization voltage to a drain of the driving transistor, and
- a fourth switch supplying current to the drain of the driving transistor for emitting light from the current light emitting device,
- wherein the third switch and the fourth switch are provided commonly for a plurality of the current light emitting devices, and
- each of the pixel circuits is driven to have:
- an initialization period for charging the second capacitor to a predetermined voltage;
- a threshold detecting period for detecting a threshold voltage of the driving transistor following the initialization period;
- a writing period for writing the image signal voltage to the first capacitor following the threshold detecting period;
- and a luminescence period for causing the current light emitting device to emit light following the writing period.
13 more elements
A display apparatus having a plurality of arrayed pixel circuits, each of the pixel circuits comprising:
- a current light emitting device;
- a driving transistor supplying current to the current light emitting device;
- a first capacitor having a first terminal connected to a gate of the driving transistor;
- a second capacitor connected between a second terminal of the first capacitor and a source of the driving transistor;
- a first switch applying a reference voltage to a node at which the first capacitor and the second capacitor are connected;
- a second switch supplying an image signal voltage to the gate of the driving transistor, and
- a fifth switch applying the reference voltage to the gate of the driving transistor, the display apparatus further comprising:
- a third switch supplying an initialization voltage to a drain of the driving transistor, and
- a fourth switch supplying current to the drain of the driving transistor for emitting light from the current light emitting device,
- wherein a plurality of the current light emitting devices are arranged in a current light emitting device row,
- the third switch is provided commonly for each of the plurality of the current light emitting devices in the current light emitting device row,
- the fourth switch is provided commonly for one or more among the plurality of current light emitting devices included in the current light emitting device row, and
- each of the pixel circuits is driven to have:
- an initialization period for charging the second capacitor to a predetermined voltage;
- a threshold detecting period for detecting a threshold voltage of the driving transistor following the initialization period;
- a writing period for writing the image signal voltage to the first capacitor following the threshold detecting period;
- and a luminescence period for causing the current light emitting device to emit light following the writing period.
14 more elements
Dependencies are inferred from the claim text.