Display apparatus, display-apparatus driving method and eletronic instrument

1. A display apparatus comprising:

a pixel matrix section including pixel circuits laid out to form a pixel matrix to serve as pixel circuits each having

an electro optical device configured to provide a light emission period and a no-light emission period,

a signal writing transistor for writing a video signal,

a signal storage capacitor for holding the video signal written by the signal writing transistor, and

a device driving transistor for driving the electro optical device in accordance with the video signal held by the signal storage capacitor, the signal storage capacitor having a first terminal connected to a gate terminal of the device driving transistor and a second terminal connected to a first current terminal of the device driving transistor, and

a power-supply section configured to change a power-supply electric potential appearing on a power-supply line that is connected to a second current terminal of the device driving transistor,

said change of the power-supply electric potential appearing on the power supply line by the power-supply section comprising a first potential being applied to the power-supply line for providing a driving current flowing through the device driving transistor during the light emission period, the power-supply line being floated by disconnecting the power-supply line from the power-supply electric potential within a first portion of the no-light emission period, and a second potential being applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, the second potential being set to cause a reverse bias of the electro optical device, wherein the power-supply section is configured to provide the first potential throughout a write period of writing the video signal.

2. The display apparatus according to claim 1 , wherein the write period and a mobility correction period occur concurrently.

3. A driving method provided for a display apparatus including

pixel circuits laid out to form a pixel matrix to serve as pixel circuits each having an electro optical device configured to provide a light emitting period and a no-light emitting period, a signal writing transistor for writing a video signal, a signal storage capacitor for holding the video signal written by the signal writing transistor, and a device driving transistor for driving the electro optical device in accordance with the video signal held by the signal storage capacitor, the signal capacitor having a first terminal connected to a gate of the device driving transistor and a second terminal connected to a first current terminal of the device driving transistor, the driving method comprising:

changing a power-supply electric potential appearing on a power-supply line that is connected to a second current terminal of the device driving transistor,

said changing the power-supply electric potential appearing on the power-supply line comprising a first potential being applied to the power-supply line for providing a driving current flowing through the device driving transistor during the light emission period, the power-supply line being floated by disconnecting the power-supply line from the power-supply electric potential within a first portion of the no-light emission period, and a second potential being applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, the second potential being set to cause a reverse bias of the electro optical device, wherein said changing the power-supply electric potential provides the first potential throughout a write period of writing the video signal.

4. The driving method according to claim 3 , wherein the write period and a mobility correction period occur concurrently.

5. An electronic device employing a display apparatus comprising:

a pixel matrix section including pixel circuits laid out to form a pixel matrix to serve as pixel circuits each having

an electro optical device configured to have a light emission period and a no-light emission period,

a signal writing transistor for writing a video signal into a signal storage capacitor,

the signal storage capacitor for holding the video signal written by the signal writing transistor, and

a device driving transistor for driving the electro optical device in accordance with the video signal held by the signal storage capacitor, the signal storage capacitor having a first terminal connected to a gate terminal of the device driving transistor, the second terminal connected to a current terminal of the device driving transistor, and

a power-supply section configured to change a power-supply electric potential appearing on a power-supply line that is connected to a second current terminal of the device driving transistor,

said change of the power-supply electric potential appearing on the power supply line by the power-supply section comprising a first potential being applied to the power-supply line for providing a driving current flowing through the device driving transistor during the light emission period, the power-supply line being floated by disconnecting the power-supply line from the power-supply electric potential within a first portion of the no-light emission period, and a second potential being applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, the second potential being set to cause a reverse bias of the electro optical device, wherein the power-supply section is configured to provide the first potential throughout a write period of writing the video signal.

6. The electronic device according to claim 5 , wherein the write period and a mobility correction period occur concurrently.

7. A display apparatus comprising:

pixel matrix means including pixel circuits laid out to form a pixel matrix to serve as pixel circuits each having

an electro optical device having a light emission period and a no-light emission period,

a signal writing transistor for writing a video signal,

a signal storage capacitor for holding the video signal written by the signal writing transistor, and

a device driving transistor for driving the electro optical device in accordance with the video signal held by the signal storage capacitor, the signal storage capacitor having a first terminal connected to a gate terminal of the device driving transistor and a second terminal connected to a first current terminal of the device driving transistor, and

power-supply means for changing a power-supply electric potential appearing on a power-supply line that is connected to a second current terminal of the device driving transistor, said changing the power-supply electric potential appearing on the power-supply line comprising a first potential being applied to the power-supply line for providing a driving current flowing through the device driving transistor during the light emission period, the power-supply line being floated by disconnecting the power-supply line from the power-supply electric potential within a first portion of the no-light emission period, and a second potential being applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, the second potential being set to cause a reverse bias of the electro optical device, wherein the power-supply means is configured to provide the first potential throughout a write period of writing the video signal.

8. The display apparatus according to claim 7 , wherein the write period and a mobility correction period occur concurrently.