Display apparatus, display-apparatus driving method and electronic instrument

1. A display apparatus comprising:

a pixel array section including pixel circuits laid out to form a matrix, the pixel circuits each having

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

said signal storage capacitor for storing a video signal written by said signal writing transistor,

a device driving transistor for driving an electro optical device in accordance with the video signal stored in said signal storage capacitor, and

said electro optical device for emitting light according to the video signal; and

a pixel driving section configured to drive each of said pixel circuits included in said pixel array section, wherein

in a no-light emission period of said electro optical device, said pixel driving section carries out a threshold-voltage correction process that provides an initialization electric potential at the gate electrode of said device driving transistor and that changes an electric potential appearing on a current electrode of said device driving transistor toward an electric potential obtained as a result of subtracting the threshold voltage of said device driving transistor from said initialization electric potential, and

when a current is not flowing through said device driving transistor, said pixel driving section applies a positive bias voltage to the gate electrode of said signal writing transistor, wherein said pixel driving section applies said positive bias voltage to said gate electrode of said signal writing transistor continuously throughout a plurality of horizontal scan periods before a horizontal scan period during which said threshold-voltage correction process occurs.

2. The display apparatus according to claim 1 , wherein:

said initialization electric potential is supplied to said pixel circuit through a signal line for supplying a video signal to said pixel circuit at selected time slots; and

said pixel driving section supplies said positive bias voltage to said gate electrode of said signal writing transistor when said initialization electric potential is being asserted on said signal line.

3. A driving method for driving a display apparatus having a pixel array section including pixel circuits laid out to form a matrix, the pixel circuits each having a signal writing transistor for writing a video signal into a signal storage capacitor, said signal storage capacitor for storing a video signal written by said signal writing transistor, a device driving transistor for driving an electro optical device in accordance with the video signal stored in said signal storage capacitor, and said electro optical device for emitting light according to the video signal the method comprising:

carrying out, in a no-light emission period of said electro optical device, a threshold-voltage correction process that provides an initialization electric potential at the gate electrode of said device driving transistor and that changes an electric potential appearing on a current terminal of said device driving transistor toward an electric potential obtained as a result of subtracting the threshold voltage of said device driving transistor from said initialization electric potential, and

applying, when a current is not flowing through said device driving transistor, a positive bias voltage to said gate electrode of said signal writing transistor, said positive bias voltage being applied to said gate electrode of said signal writing transistor continuously throughout a plurality of horizontal scan periods before a horizontal scan period during which said threshold-voltage correction process occurs.

4. An electronic instrument employing a display apparatus comprising:

a pixel array section including pixel circuits laid out to form a matrix, the pixel circuits each having

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

said signal storage capacitor for storing a video signal written by said signal writing transistor,

a device driving transistor for driving an electro optical device in accordance with the video signal stored in said signal storage capacitor, and

said electro optical device for emitting light according to the video signal; and

a pixel driving section configured to drive each of said pixel circuits included in said pixel array section, wherein

in a no-light emission period of said electro optical device, said pixel driving section carries out a threshold-voltage correction process that provides an initialization electric potential at the gate electrode of said device driving transistor and that changes an electric potential appearing on a current electrode of said device driving transistor toward an electric potential obtained as a result of subtracting the threshold voltage of said device driving transistor from said initialization electric potential, and

when a current is not flowing through said device driving transistor, said pixel driving section applies a positive bias voltage to said gate electrode of said signal writing transistor, wherein said pixel driving section applies said positive bias voltage to said gate electrode of said signal writing transistor continuously throughout a plurality of horizontal scan periods before a horizontal scan period during which said threshold-voltage correction process occurs.