Organic light emitting display apparatus and pixel driving circuit that compensates for a threshold voltage degradation of a driving transistor

Abstract

A display apparatus comprises a plurality of scan lines and a plurality of data lines intersected with the scan lines in a grid, a plurality of pixel units, a first driving circuit for providing a plurality of scanning signals to the plurality of pixel units, and a plurality of pixel driving circuits. Each pixel driving circuit corresponds to one of the plurality of pixel units, and drives the corresponding pixel unit. Each pixel driving circuit comprises a switching transistor, a driving transistor, an organic light emitting diode and a reset transistor. The reset transistor pulls down a voltage applied on the driving transistor during a reset period under a control of a received another scanning signal having a phase previous to the scanning signal applied on a corresponding scan line being selected.