Driving method for pixel circuit and display apparatus

1. A display apparatus, comprising:

a pixel array including a plurality of pixel circuits disposed in a matrix and each including a light emitting element, a driving transistor for supplying current in response to a signal value applied between a gate and a source thereof to said light emitting element when a driving voltage is applied between a drain and the source thereof, and a holding capacitor connected between the gate and the source of said driving transistor for holding the input signal value; and

a light emission driving section configured to apply the signal value to said holding capacitor of each of said pixel circuits of said pixel array so that the light emitting element of the pixel circuit emits light with a luminance corresponding to the signal value;

said light emission driving section driving said pixel circuit to carry out, as light emitting operation of one cycle which includes a no-light emitting period and a light emitting period;

ending a light emitting operation of the light emitting element;

fixing the gate of the driving transistor to a predetermined potential and applying a driving voltage between the drain and the source of the driving transistor to initialize the gate-source voltage of the driving transistor;

canceling the fixation of the gate potential of the driving transistor and ending the application of the driving voltage between the drain and the source of the driving transistor to maintain the initialization state of the gate-source voltage;

fixing the gate of the driving transistor to a reference voltage and applying the driving voltage between the drain and the source of the driving transistor to carry out threshold value correction so that the gate-source voltage of the driving transistor may become equal to a threshold voltage of the driving transistor;

applying a voltage as a signal value to the holding capacitor and executing a mobility correction operation of the driving transistor; and

supplying current corresponding to the gate-source voltage of the driving transistor on which the signal value is reflected to the light emitting element so that emission of light of the light emitting element with a luminance corresponding to the signal value is executed.

2. A driving method for a pixel circuit which includes a light emitting element, a driving transistor for applying current in response to a signal value applied between a gate and a source thereof to the light emitting element when a driving voltage is applied between a drain and the source thereof, and a holding capacitor connected between the gate and the source of the driving transistor for holding the input signal value, the driving method comprising steps carried out within a light emitting period of one cycle which includes a no-light emitting period and the light emitting period, the steps including:

a first step of ending a light emitting operation of the light emitting element;

a second step of fixing the gate of the driving transistor to a predetermined potential and applying a driving voltage between the drain and the source of the driving transistor to initialize the gate-source voltage of the driving transistor;

a third step of canceling the fixation of the gate potential of the driving transistor and ending the application of the driving voltage between the drain and the source of the driving transistor to maintain the initialization state of the gate-source voltage;

a fourth step of fixing the gate of the driving transistor to a reference voltage and applying the driving voltage between the drain and the source of the driving transistor to carry out threshold value correction so that the gate-source voltage of the driving transistor may become equal to a threshold voltage of the driving transistor;

a fifth step of applying a voltage as a signal value to the holding capacitor and executing a mobility correction operation of the driving transistor; and

a sixth step of supplying current corresponding to the gate-source voltage of the driving transistor on which the signal value is reflected to the light emitting element so that emission of light of the light emitting element with a luminance corresponding to the signal value is executed.

3. The driving method for the pixel circuit according to claim 2 , wherein,

at the second step, while the gate of the driving transistor is fixed to the predetermined potential, the driving voltage is applied between the drain and the source of the driving transistor to initialize the gate-source voltage of the driving transistor so as to be equal to the threshold voltage of the driving transistor.

4. The driving method for the pixel circuit according to claim 3 , wherein

the predetermined potential to which the gate of the driving transistor is fixed at the second step is equal to the reference potential to which the gate of the driving transistor is fixed at the fourth step.

5. The driving method for the pixel circuit according to claim 2 , wherein,

at the first step, the driving voltage application between the drain and the source of the driving transistor is ended to end the light emitting operation of the light emitting element.

6. The driving method for the pixel circuit according to claim 2 , wherein,

at the first step, the gate-source voltage of the driving transistor is set lower than the threshold voltage to end the light emitting operation of the light emitting element, and then the driving voltage application between the drain and the source of the driving transistor is ended.