公开(公告)号：US11335757B2

公开(公告)日：2022-05-17

申请号：US16985081

申请日：2020-08-04

Applicant: LG Display Co., Ltd.

Inventor： Aram Kim ,  JaeHoon Park ,  YoungJang Lee ,  SeonYeong Kim

IPC: G09G3/3233 ,  G09G3/3266 ,  H01L27/32

Abstract: The pixel circuit which controls the driving of the organic light emitting diode includes a driving TFT which supplies a driving current to the organic light emitting diode; a sampling TFT which samples a threshold voltage of the driving TFT; a first initializing TFT which supplies an initialization voltage to one electrode of the organic light emitting diode; and a storage capacitor which stores a voltage applied to the driving TFT, and at least one of the driving TFT, the sampling TFT, and the first initializing TFT includes a shielding electrode disposed between the substrate and the active layer. Therefore, even though the external light is irradiated onto a transparent substrate, a full white gray-level and a full black gray-level can be expressed so that the gray-level expressiveness may not be degraded.