NDLI: Polarity Balanced Driving Scheme to Suppress the Degradation of <formula formulatype=inline><tex>$V_{rm th}$</tex></formula> in a-Si:H TFT Due to the Positive Gate Bias Stress for AMOLED

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Year : 2006 Volume : 2

Year : 2005 Volume : 1

Polarity Balanced Driving Scheme to Suppress the Degradation of $V_{rm th}$ in a-Si:H TFT Due to the Positive Gate Bias Stress for AMOLED

Content Provider	IEEE Xplore Digital Library
Author	Bong-Hyun You Jae-Hoon Lee Min-Koo Han
Copyright Year	2005
Abstract	In this paper, we propose a new amorphous silicon (a-Si:H) thin-film transistor (TFT) pixel circuit employing negative bias annealing for active-matrix organic light-emitting diode (AMOLED). This circuit consists of two driving TFTs, four switching TFTs, and two storage capacitors. The new driving scheme adopting negative bias annealing entitled polarity balanced driving (PBD) successfully suppresses the troublesome Vth shift in a-Si:H TFT. The proposed pixel circuit was verified by simulation and fabrication. When a severe electrical bias is applied more than 24 hours and a temperature is increased up to 60 degC rather than a room temperature, the current stability (I_{after_stress}/Imax) of the proposed PBD pixel is 0.97 while that of the conventional one is 0.72. Our experimental results show that the proposed PBD can improve a stability of a-Si:H TFT because the applied negative gate bias can successfully suppress V_th shift of the current-driving a-Si:H TFT
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	40
Ending Page	44
Page Count	5
File Size	782067
File Format	PDF
ISSN	1551319X
Volume Number	3
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-03-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thin film transistors Annealing Temperature Thermal degradation Amorphous silicon Active matrix technology Organic light emitting diodes Active matrix organic light emitting diodes Switching circuits Switched capacitor circuits polarity balanced driving (PBD) active-matrix organic light-emitting diode (AMOLED) negative bias annealing
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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