Pixel circuit and display unit
A pixel circuit includes a driving transistor, a write transistor, a first switching transistor, a second switching transistor, a first storage capacitor, and a second storage capacitor. The driving transistor controls a current flowing in a light-emitting device. The write transistor controls application of a signal voltage to a gate of the driving transistor. The first switching transistor controls a gate voltage of the driving transistor upon correction operation that allows a gate-source voltage of the driving transistor to come close to a threshold voltage of the driving transistor. The second switching transistor is provided at a path between first and second terminals. The first storage capacitor is provided at a path between the gate of the driving transistor and the first terminal. The second storage capacitor is provided at a path between the gate of the driving transistor and the second terminal.
1. A display unit provided with a plurality of pixels and a driving circuit, the plurality of pixels each including a light-emitting device and a pixel circuit, the driving circuit being configured to drive the plurality of pixels, the pixel circuit comprising:
a driving transistor configured to control a current flowing in a light-emitting device;
a write transistor configured to control application of a signal voltage to a gate of the driving transistor, the signal voltage corresponding to an image signal;
a first switching transistor configured to control a gate voltage of the driving transistor upon correction operation that causes a gate-source voltage of the driving transistor to approach a threshold voltage of the driving transistor;
a second switching transistor provided at an electrically conductive path between a first terminal of the driving transistor and a second terminal of the write transistor, the first terminal of the driving transistor being adjacent to the light-emitting device, the second terminal of the write transistor being adjacent to the driving transistor;
a first storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the first terminal; and
a second storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the second terminal,
wherein the driving circuit performs the correction operation by turning ON and OFF the first switching transistor and keeping a voltage corresponding to a threshold voltage of the driving transistor in the first storage capacitor and the second storage capacitor while the second switching transistor is turned ON and the write transistor is turned OFF.
2. The display unit according to claim 1 , wherein the driving circuit applies a voltage corresponding to the signal voltage to a gate of the write transistor by turning ON the write transistor after performing the correction operation.
3. A display unit provided with a plurality of pixels and a driving circuit, the plurality of pixels each including a light-emitting device and a pixel circuit, the driving circuit being configured to drive the plurality of pixels, the pixel circuit comprising:
a driving transistor configured to control a current flowing in a light-emitting device;
a write transistor configured to control application of a signal voltage to a gate of the driving transistor, the signal voltage corresponding to an image signal;
a first switching transistor configured to control a gate voltage of the driving transistor upon correction operation that causes a gate-source voltage of the driving transistor to approach a threshold voltage of the driving transistor;
a second switching transistor provided at an electrically conductive path between a first terminal of the driving transistor and a second terminal of the write transistor, the first terminal of the driving transistor being adjacent to the light-emitting device, the second terminal of the write transistor being adjacent to the driving transistor;
a first storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the first terminal; and
a second storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the second terminal,
wherein the pixel circuit further comprises:
a third switching transistor configured to control a current flowing in the driving transistor; and
a fourth switching transistor configured to control application of a fixed voltage to the first terminal,
the first switching transistor is provided at an electrically conductive path between the gate of the driving transistor and a terminal of the driving transistor, the terminal of the driving transistor being adjacent to the third switching transistor,
the driving circuit performs the correction operation by turning ON and OFF both the third switching transistor and the first switching transistor while the second switching transistor is turned ON and the write transistor is turned OFF.
4. The display unit according to claim 3 , wherein the driving circuit applies a voltage corresponding to the signal voltage to a gate of the write transistor by turning ON the write transistor after performing the correction operation.
5. A display unit provided with a plurality of pixels and a driving circuit, the plurality of pixels each including a light-emitting device and a pixel circuit, the driving circuit being configured to drive the plurality of pixels, the pixel circuit comprising:
a driving transistor configured to control a current flowing in a light-emitting device;
a write transistor configured to control application of a signal voltage to a gate of the driving transistor, the signal voltage corresponding to an image signal;
a first switching transistor configured to control a gate voltage of the driving transistor upon correction operation that causes a gate-source voltage of the driving transistor to approach a threshold voltage of the driving transistor;
a second switching transistor provided at an electrically conductive path between a first terminal of the driving transistor and a second terminal of the write transistor, the first terminal of the driving transistor being adjacent to the light-emitting device, the second terminal of the write transistor being adjacent to the driving transistor;
a first storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the first terminal; and
a second storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the second terminal,
wherein the pixel circuit further comprises:
a sixth switching transistor provided at an electrically conductive path between the first terminal and the light-emitting device,
the driving circuit performs the correction operation by turning ON and OFF the first switching transistor while the second switching transistor is turned ON and both the write transistor and the sixth switching transistor are turned OFF.
6. The display unit according to claim 5 , wherein the driving circuit applies a voltage corresponding to the signal voltage to a gate of the write transistor by turning ON the write transistor after performing the correction operation.
7. A display unit provided with a plurality of pixels and a driving circuit, the plurality of pixels each including a light-emitting device and a pixel circuit, the driving circuit being configured to drive the plurality of pixels, the pixel circuit comprising:
a driving transistor configured to control a current flowing in a light-emitting device;
a write transistor configured to control application of a signal voltage to a gate of the driving transistor, the signal voltage corresponding to an image signal;
a first switching transistor configured to control a gate voltage of the driving transistor upon correction operation that causes a gate-source voltage of the driving transistor to approach a threshold voltage of the driving transistor;
a second switching transistor provided at an electrically conductive path between a first terminal of the driving transistor and a second terminal of the write transistor, the first terminal of the driving transistor being adjacent to the light-emitting device, the second terminal of the write transistor being adjacent to the driving transistor;
a first storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the first terminal; and
a second storage capacitor provided at an electrically conductive path between the gate of the driving transistor and the second terminal,
wherein the pixel circuit further comprises:
a fourth switching transistor configured to control application of a fixed voltage to the first terminal,
the driving circuit performs the correction operation by turning ON and OFF both the fourth switching transistor and the first switching transistor while the second switching transistor is turned ON and the write transistor is turned OFF.
8. The display unit according to claim 7 , wherein the driving circuit applies a voltage corresponding to the signal voltage to a gate of the write transistor by turning ON the write transistor after performing the correction operation.