Display apparatus, display-apparatus driving method and electronic 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 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 the device driving transistor, 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, a second potential being applied to the power-supply line within the no-light emission period, and a cathode potential being applied to the power-supply line within the no-light emission period, the cathode potential being an electric potential appearing on a cathode electrode of the electro optical device and differing from the second potential, wherein the cathode potential is applied to the power-supply line during a first portion of the no-light emission period, the second potential is applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, and the second potential is lower than the cathode potential to apply a reverse bias to the electro optical device.

2. The display apparatus according to claim 1 , wherein the power-supply line is connected to another current terminal of the device driving transistor that is opposite to the current terminal of the device driving transistor that is connected to the second terminal of the signal storage capacitor.

3. The display apparatus according to claim 1 , wherein the power-supply section controls a ratio of the light emission period to the no-light emission period by adjusting a length of the light emission period wherein the power-supply section applies a forward bias to the electro optical device.

4. 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 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 said 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 current terminal of the device driving transistor, said driving method comprising:

changing a power-supply electric potential appearing on a power-supply line that is connected to the device driving transistor, 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, a second potential being applied to the power-supply line within the no-light emission period, and a cathode potential being applied to the power-supply line within the no-light emission period, the cathode potential being an electric potential appearing on a cathode electrode of the electro optical device and differing from the second potential, wherein the cathode potential is applied to the power-supply line during a first portion of the no-light emission period, the second potential is applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, and the second potential is lower than the cathode potential to apply a reverse bias to the electro optical device.

5. The method according to claim 4 , wherein the power-supply line is connected to another current terminal of the device driving transistor that is opposite to the current terminal of the device driving transistor that is connected to the second terminal of the signal storage capacitor.

6. The method according to claim 4 , wherein the power-supply section controls a ratio of the light emission period to the no-light emission period by adjusting a length of the light emission period wherein the power-supply section applies a forward bias to the electro optical device.

7. 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 provide 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 electrode of the device driving transistor and a second electrode 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 the device driving transistor, 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, a second potential being applied to the power-supply line within the no-light emission period, and a cathode potential being applied to the power-supply line within the no-light emission period, the cathode potential being an electric potential appearing on a cathode electrode of the electro optical device and differing from the second potential, wherein the cathode potential is applied to the power-supply line during a first portion of the no-light emission period, the second potential is applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, and the second potential is lower than the cathode potential to apply a reverse bias to the electro optical device.

8. The electronic device according to claim 7 , wherein the power-supply line is connected to another current terminal of the device driving transistor that is opposite to the current terminal of the device driving transistor that is connected to the second terminal of the signal storage capacitor.

9. The electronic device according to claim 7 , wherein the power-supply section controls a ratio of the light emission period to the no-light emission period by adjusting a length of the light emission period wherein the power-supply section applies a forward bias to the electro optical device.

10. 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 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 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 the device driving transistor, 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, a second potential being applied to the power-supply line within the no-light emission period, and a cathode potential being applied to the power-supply line within the no-light emission period, the cathode potential being an electric potential appearing on a cathode electrode of the electro optical device and differing from the second potential, wherein the cathode potential is applied to the power-supply line during a first portion of the no-light emission period, the second potential is applied to the power-supply line during a second portion of the no-light emission period that occurs after the first portion, and the second potential is lower than the cathode potential to apply a reverse bias to the electro optical device.

11. The display apparatus according to claim 10 , wherein the power-supply line is connected to another current terminal of the device driving transistor that is opposite to the current terminal of the device driving transistor that is connected to the second terminal of the signal storage capacitor.

12. The display apparatus according to claim 10 , wherein the power-supply section controls a ratio of the light emission period to the no-light emission period by adjusting a length of the light emission period wherein the power-supply section applies a forward bias to the electro optical device.