公开(公告)号：US10475381B2

公开(公告)日：2019-11-12

申请号：US15637983

申请日：2017-06-29

Applicant: LG DISPLAY CO., LTD.

Inventor： Siu Yoon ,  Seung Chan Choi ,  Jun Ho Lee ,  Sung Bin Ryu ,  Ki Tae Kim

IPC: G09G3/3233 ,  G09G3/3291

Abstract: According to an aspect of the present disclosure, an organic light emitting display device includes a plurality of pixels each including a pixel driving circuit. The plurality of pixels includes an organic light emitting diode and a driving TFT configured to control driving of the organic light emitting diode and including a gate node as a first node, a source node as a second node, and a drain node. Also, the plurality of pixels includes first to third switching TFTs electrically connected to the driving TFT and first and second storage capacitors configured to store a voltage to be applied to the driving TFT DT. Further, the plurality of pixels includes a coupling capacitor connected to a gate node of the third switching TFT so as to increase a voltage to be applied to the gate node of the driving TFT.

公开(公告)号：US10297781B2

公开(公告)日：2019-05-21

申请号：US15637993

申请日：2017-06-29

Applicant: LG DISPLAY CO., LTD.

Inventor： Siu Yoon ,  Seung Chan Choi ,  Jun Ho Lee ,  Sung Bin Ryu ,  Ki Tae Kim

IPC: H01L51/52 ,  H01L51/05 ,  H01L51/50 ,  G09G3/3233 ,  H01L27/32

Abstract: An organic light emitting display device includes a plurality of pixels each having a pixel driving circuit. Each of the pixels includes an organic light emitting diode and a driving TFT that controls driving of the organic light emitting diode and includes an active layer of low temperature poly-silicon, a gate node, a source node, and a drain node. The pixels include first to fifth switching TFTs electrically connected to the driving TFT and each including an active layer of an oxide semiconductor, a gate node, a source node, and a drain node. Further, the pixels include a storage capacitor connected between the gate node of the driving TFT and the source node of the fifth switching TFT and a coupling capacitor electrically connected in series to the storage capacitor and configured to cause capacitive coupling to supply a bootstrapped voltage to the gate node of the driving TFT.