Display apparatus
View Patent ↗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.
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 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.
2. 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.
3. 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.
4. A display apparatus according to claim 1 , wherein the initialization voltage is supplied to initialization voltage lines which are connected commonly to all of the pixel circuits.
5. A display apparatus according to claim 2 , wherein the initialization voltage is supplied to initialization voltage lines which are connected commonly to all of the pixel circuits.
6. A display apparatus according to claim 3 , wherein the initialization voltage is supplied to initialization voltage lines which are connected commonly to all of the pixel circuits.
7. A display apparatus according to claim 1 , wherein the initialization voltage is a predetermined fixed voltage which is lower than a voltage resulting from subtracting a threshold voltage of the driving transistor from the reference voltage.
8. A display apparatus according to claim 2 , wherein the initialization voltage is a predetermined fixed voltage which is lower than a voltage resulting from subtracting a threshold voltage of the driving transistor from the reference voltage.
9. A display apparatus according to claim 3 , wherein the initialization voltage is a predetermined fixed voltage which is lower than a voltage resulting from subtracting a threshold voltage of the driving transistor from the reference voltage.
10. A display apparatus according to claim 1 , wherein a first control signal and a second control signal are shared, the first control signal controlling turning ON or OFF of the third switch, the second control signal controlling turning ON or OFF of the fifth switch.