Display apparatus, display-apparatus driving method and electronic equipment

1. A display apparatus comprising:

a pixel array section including pixel circuits laid out to form a matrix as pixel circuits each having an electro-optical device,

a write transistor configured to carry out a voltage storing process to sample a video signal that is provided from a signal line, and to store said sampled video signal into said pixel circuit,

a holding capacitor configured to hold said sampled video signal stored in said pixel circuit by said write transistor, and

a driving transistor configured to drive said electro-optical device on the basis of said video signal held by said voltage holding capacitor; and

a driving circuit configured to carry out

a selective scan operation on said pixel circuits in said pixel array section in row units,

a preparatory operation to set electric potentials on a gate and a source of said driving transistor during a non-light-emitting period, and

a threshold-voltage correction operation to correct variations of the threshold voltage of every driving transistor for each pixel row selected in said selective scan operation:

wherein, before said driving circuit carries out the threshold-voltage correction operation on a pixel row in a horizontal scan period, said driving circuit performs the preparatory operation on said pixel row in order to set the electric potential on the gate of said driving transistor according to a first reference voltage provided from the signal line through the write transistor and to set the electric potential on the source of said driving transistor according to a second reference voltage provided through the driving transistor.

2. The display apparatus according to claim 1 wherein said driving circuit carries out a mobility correction operation on a pixel row in order to compensate for variations of the mobility of each driving transistor employed in said pixel row in the same horizontal scan period as said threshold-voltage correction operation carried out on said pixel row after execution of said threshold-voltage correction operation.

3. The display apparatus according to claim 2 wherein said driving circuit carries out said mobility correction operation in a write period during which said write transistor performs said voltage storing process to store said sampled video signal into said pixel circuit.

4. The display apparatus according to claim 1 , wherein the second reference potential is provided from a power supply line through the driving transistor, the second reference potential differing from a voltage supply level provided from the power supply line for a light emitting period of the electro-optical device.

5. A driving method adopted by a display apparatus comprising—a pixel array section including pixel circuits laid out to from a matrix as pixel circuits each having an electro-optical device, a write transistor configured to carry out a voltage storing process to sample a video signal that is provided from a signal line and to store said sampled video signal into said pixel circuit, a holding capacitor configured to hold said sampled video signal stored in said pixel circuit by said write transistor, a driving transistor configured to drive said electro-optical device on the basis of said video signal held by said voltage holding capacitor, and a driving circuit, the method comprising:

performing a selective scan operation on said pixel circuits in said pixel array section in row units,

performing a preparatory operation to set electric potentials on a gate and a source of said driving transistor during a non-light-emitting period, and

performing a threshold-voltage correction operation to correct variations of the threshold voltage of every driving transistor for each pixel row selected in said selective scan operation,

wherein, before the threshold-voltage correction operation is performed on said pixel row in a horizontal scan period, the preparatory operation is performed on said pixel row in order to set the electric potential on the gate of said driving transistor according to a first reference voltage provided from the signal line through the write transistor and to set the electric potential on the source of said driving transistor at a predetermined level according to a second reference voltage provided through the driving transistor.

6. The driving method according to claim 5 , further comprising:

performing a mobility correction operation on a pixel row in order to compensate for variations of the mobility of each driving transistor employed in said pixel row in the same horizontal scan period as said threshold-voltage correction operation carried out on said pixel row after execution of said threshold-voltage correction operation.

7. The driving method according to claim 6 , wherein said mobility correction operation is performed in a write period during which said write transistor performs said voltage storing process to store said sampled video signal into said pixel circuit.

8. The driving method according to claim 5 , wherein the second reference potential is provided from a power supply line through the driving transistor, the second reference potential differing from a voltage supply level provided from the power supply line for a light emitting period of the electro-optical device.

9. An electronic equipment employing a display apparatus comprising:

a pixel array section including pixel circuits laid out to from a matrix as pixel circuits each having

an electro-optical device,

a write transistor for carrying out a voltage storing process to sample a video signal that is provided from a signal line, and to store said sampled video signal into said pixel circuit,

a holding capacitor for holding said sampled video signal stored in said pixel circuit by said write transistor, and

a driving transistor for driving said electro-optical device on the basis of said video signal held by said voltage holding capacitor; and

a driving circuit for carrying out

a selective scan operation on said pixel circuits in said pixel array section in row units,

a preparatory operation to set electric potentials on a gate and a source of said driving transistor during a non-light-emitting period, and

a threshold-voltage correction operation to correct variations of the threshold voltage of every driving transistor for each pixel row selected in said selective scan operation

wherein, before said threshold-voltage correction operation is carried out on said pixel row in a horizontal scan period, the preparatory operation is carried out on said pixel row in order to set the electric potential on the gate of said driving transistor according to a first reference voltage provided from the signal line through the write transistor and to set the electric potential on the source of said driving transistor according to a second reference voltage provided through the driving transistor.

10. The electronic apparatus according to claim 9 , wherein said driving circuit carries out a mobility correction operation on a pixel row in order to compensate for variations of the mobility of each driving transistor employed in said pixel row in the same horizontal scan period as said threshold-voltage correction operation carried out on said pixel row after execution of said threshold-voltage correction operation.

11. The electronic apparatus according to claim 10 , wherein said driving circuit carries out said mobility correction operation in a write period during which said write transistor performs said voltage storing process to store said sampled video signal into said pixel circuit.

12. The electronic apparatus according to claim 9 , wherein the second reference potential is provided from a power supply line through the driving transistor, the second reference potential differing from a voltage supply level provided from the power supply line for a light emitting period of the electro-optical device.