Patent ID: 8502814

Claim:
A display apparatus comprising: pixel circuits, each equipped with: a light emitting element; a driving transistor, with a drain terminal thereof connected to a cathode terminal of the light emitting element, that applies a drive current to the light emitting element; a capacitor element connected to a gate terminal of the driving transistor; and a switching transistor connected between a first terminal of the capacitor element on the side of the gate terminal and a data line through which a desired program signal flows; an active matrix substrate in which a great number of the pixel circuits, in which the drive transistors are inorganic oxide thin film transistors having a negative voltage as a threshold voltage for an OFF operation are arranged; a data driving circuit for supplying the program signal; and a common power source for supplying a predetermined common voltage to a source terminal of the driving transistor and a second terminal of the capacitor element; wherein the voltage value Vprg of the program signal satisfies the condition: Vprg≧0; the common power source supply the common voltage when the switching transistor is turned ON and a voltage value Vprg of the program signal is applied to the gate terminal of the driving transistor; the common voltage VB and the threshold voltage VTH of the driving transistor are set to values that satisfy the condition: VB≧−VTH.