Patent ID: 9721498
Date: 2017-08-01
CPC Classifications: G09G,H01L

Claim:
1. A display device, comprising: a substrate; a scan line and a previous scan line formed on the substrate, the scan line to transfer a scan signal and the previous scan line to transfer a previous scan signal; a data line and a driving voltage line crossing the scan line, the data line to transfer a data signal and the driving voltage line to transfer a driving voltage; a switching transistor connected to the scan line, previous scan line, and data line; a driving transistor connected to the switching transistor; a first back bias line on the substrate; a first gate insulating layer over the first back bias line; a semiconductor layer including a switching semiconductor layer and a driving semiconductor layer on the first gate insulating layer; a second gate insulating layer over the semiconductor layer; and an organic light emitting diode connected to the driving transistor, wherein the switching transistor includes a first switching gate electrode and a second switching gate electrode on different layers, wherein the previous scan signal is transferred to the first switching gate electrode and the scan signal is transferred to the second switching gate electrode, and wherein the first switching gate electrode is a part of the first back bias line.