Patent ID: 8416158
Filing Date: 2013-04-09
Classification: G09G

Abstract:
1. A display apparatus, comprising: an active matrix substrate on which multiple pixel circuits are disposed, each having a light emitting element, a drive transistor with a source terminal connected to an anode terminal of the light emitting element to apply a drive current to the light emitting element, a capacitor element connected between a gate terminal and the source terminal of the drive transistor, and a selection transistor connected between the gate terminal of the drive transistor and a data line through which a predetermined data signal flows; a control unit that corrects a threshold voltage of the drive transistor by supplying a predetermined voltage to the gate terminal of the drive transistor to cause a current to flow through the drive transistor and charging a capacitive load connected to the source terminal of the drive transistor with the current, thereby causing the capacitor element to hold the threshold voltage of the drive transistor; and a data drive circuit that supplies negative reverse bias voltages, each having a magnitude corresponding to a preset initial threshold voltage and a drive voltage of the drive transistor prior to the threshold voltage being corrected, the magnitude of the drive voltage being dependent on the amount of emission of the light emitting element, to the gate terminal of the drive transistor; wherein the data drive circuit is a circuit that performs the following: setting a limit value for the reverse bias voltages; comparing a reverse bias voltage to be supplied to the gate terminal of the drive transistor with the limit value; if the reverse bias voltage is greater than the limit value, subtracting the limit value from the reverse bias voltage to obtain a difference voltage; and sequentially carrying over and adding the difference voltage to a next reverse bias voltage to be supplied to the gate terminal of the drive transistor.