Patent ID: 9123297
Filing Date: 2015-09-01
Classification: G09G

Abstract:
1. A driving method of a display apparatus including a plurality of arrayed pixel circuits, each of the pixel circuits including: a current light emitting device; a driving transistor supplying current to the current light emitting device; a first capacitor having a first terminal connected to a gate of the driving transistor; a second capacitor connected between a second terminal of the first capacitor and a source of the driving transistor; a first switch applying a reference voltage to the gate of the driving transistor; a second switch supplying an image signal voltage to a node at which the first and the second capacitors are connected; a third switch supplying an initialization voltage to the source of the driving transistor, and a fourth switch configured to short circuit the first capacitor, the driving method comprising: (a) dividing one-frame period into an initialization period, a threshold detection period, a writing period, and a luminescence period; (b) applying, in the initialization period, a first differential voltage, defined by a difference between the reference voltage and the initialization voltage, to the second capacitor by setting the second switch OFF, and setting the first, third and fourth switches ON; (c) reducing, in the threshold detection period, the voltage of the second capacitor by closing a current path formed by the second capacitor and the driving transistor, where the current path is closed by setting second and third switches OFF and first and fourth switches ON; (d) applying, in the writing period, a second differential voltage, defined by a difference between the reference voltage and the image signal voltage, to the first capacitor by setting the third and fourth switches OFF and first and second switches ON, and (e) applying, in the luminescence period, a current to the driving transistor and the current light emitting device corresponding to the image signal voltage, by setting first, second, third and fourth switches OFF.