Pixel driving circuit and driving method thereof, array substrate and display apparatus

摘要

The embodiments of the present disclosure provide a pixel driving circuit and a driving method thereof, an array substrate and a display apparatus, which is able to avoid an influence on a driving current of an active light emitting device caused by a drift in a threshold voltage of a driving transistor. The pixel driving circuit comprises a data line, a first scan line, a second scan line, a signal controlling line, a light emitting device, a storage capacitor, a driving transistor, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor and a fifth switch transistor. The embodiments of the present disclosure may be applied to a display manufacture.

主权项

1. A pixel driving circuit, comprising a data line, a first scan line, a second scan line, a signal controlling line, a light emitting device, a storage capacitor, a driving transistor, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor and a fifth switch transistor, wherein a gate of the first switch transistor is connected to the signal controlling line, a source of the first switch transistor is connected to a first level terminal, and a drain of the first switch transistor is connected to a first electrode of the storage capacitor;
a gate of the second switch transistor is connected to the first scan line, a source of the second switch transistor is connected to a low level, and a drain of the second switch transistor is connected to a second electrode of the storage capacitor; a gate of the third switch transistor is connected to the second scan line, a source of the third switch transistor is connected to the second electrode of the storage capacitor; a gate of the fourth switch transistor is connected to the first scan line, a source of the fourth switch transistor is connected to the data line, and a drain of the fourth switch transistor is connected to the drain of the third switch transistor; a gate of the driving transistor is connected to the drain of the fourth switch transistor, and a source of the driving transistor is connected to the first electrode of the storage capacitor; a gate of the fifth switch transistor is connected to the first scan line, a source of the fifth switch transistor is connected to a drain of the driving transistor, and a drain of the fifth switch transistor is connected to the low level; and one electrode of the light emitting device is connected to the drain of the driving transistor, and the other electrode of the light emitting device is connected to a second level terminal, in a first stage, turning the first switch transistor, the second switch transistor, the fourth switch transistor and the fifth switch transistor on, turning the third switch transistor off, and charging the storage capacitor by the first level terminal; in a second stage, turning the second switch transistor, the fourth switch transistor and the fifth switch transistor on, turning the first switch transistor and the third switch transistor off, discharging the storage capacitor until a voltage difference between a gate and a source of the driving transistor is equal to a threshold voltage of the driving transistor; in a third stage, turning the first switch transistor and the third switch transistor on, turning the second switch transistor, the fourth switch transistor and the fifth switch transistor off, and applying an ON signal to the light emitting device by the first level terminal and the second level terminal.