Display apparatus
View Patent ↗The display apparatus has a plurality of arrayed pixel circuits. Each of the pixel circuits has a current light emitting device; a driving transistor supplying current to the current light emitting device; a first capacitor having a first terminal connected with 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 third switch supplying an initialization voltage to the source of the driving transistor.
1. 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 with 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 the source of the driving transistor, and
a fourth switch applying the reference voltage to the gate of the driving transistor, the fourth switch having a first terminal directly connected to a voltage line applied with the reference voltage and a second terminal connected to the gate of the driving transistor,
wherein the each of the pixel circuits is driven to have an initialization period, a threshold detecting period, a writing period, and a luminescence period, the initialization period being a period in which the second capacitor is charged to a predetermined voltage, the threshold detecting period being a period in which a threshold voltage of the driving transistor is detected by only the second capacitor after the initialization period, the writing period being a period in which the image signal voltage is supplied to only the first capacitor after the threshold detecting period, and the luminescence period being a period in which the current light emitting device is caused to emit light after the writing period.
2. The display apparatus of claim 1 , further comprising:
a fifth switch configured to cut off a current flow between the source of the driving transistor and the current light emitting device.
3. The display apparatus of claim 1 , further comprising:
a fifth switch configured to cut off a current flow between a drain of the driving transistor and a power supply supplying current to the current light emitting device.
4. The display apparatus of claim 1 , wherein a third control signal and a fourth control signal are shared, the third control signal being for performing control to set the third switch to ON and OFF, and the fourth control signal being for performing control to set the fourth switch to ON and OFF.
5. The display apparatus of claim 1 , wherein a second control signal and a third control signal are not shared, the second control signal being for performing control to set the second switch to ON and OFF, and the third control signal being for performing control to set the third switch to ON and OFF.
6. The display apparatus of claim 1 , wherein in the threshold detecting period, the third switch is OFF while the reference voltage is applied to a point at which the gate of the driving transistor and the first capacitor are connected and the node at which the first capacitor and the second capacitor are connected.
7. The display apparatus of claim 1 , wherein in the writing period, the first switch and the second switch are ON and the third switch and the fourth switch are OFF.
8. The display apparatus of claim 1 , wherein in the luminescence period, the first switch, the second switch, the third switch, and the fourth switch are all OFF.
9. 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 with 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 the source of the driving transistor, and
a fourth switch configured to short circuit the node of the first and second capacitor and the gate of the driving transistor,
wherein the each of the pixel circuits is driven to have an initialization period, a threshold detecting period, a writing period, and a luminescence period, the initialization period being a period in which the second capacitor is charged to a predetermined voltage, the threshold detecting period being a period in which a threshold voltage of the driving transistor is detected by only the second capacitor after the initialization period, the writing period being a period in which the image signal voltage is supplied to only the first capacitor after the threshold detecting period, and the luminescence period being a period in which the current light emitting device is caused to emit light after the writing period.
10. The display apparatus of claim 9 , further comprising:
a fifth switch configured to cut off a current flow between the source of the driving transistor and the current light emitting device.
11. A display apparatus of claim 9 , further comprising:
a fifth switch configured to cut off a current flow between a drain of the driving transistor and a power supply supplying current to the current light emitting device.
12. The display apparatus of claim 9 , wherein a third control signal and a fourth control signal are shared, the third control signal being for performing control to set the third switch to ON and OFF, and the fourth control signal being for performing control to set the fourth switch to ON and OFF.
13. The display apparatus of claim 9 , wherein a second control signal and a third control signal are not shared, the second control signal being for performing control to set the second switch to ON and OFF, and the third control signal being for performing control to set the third switch to ON and OFF.
14. The display apparatus of claim 9 , wherein in the threshold detecting period, the third switch is OFF while the reference voltage is applied to a point at which the gate of the driving transistor and the first capacitor are connected and the node at which the first capacitor and the second capacitor are connected.
15. The display apparatus of claim 9 , wherein in the writing period, the first switch and the second switch are ON and the third switch and the fourth switch are OFF.
16. The display apparatus of claim 9 , wherein in the luminescence period, the first switch, the second switch, the third switch, and the fourth switch are all OFF.