Active-Matrix Organic Light Emission Diode Pixel Circuit for Suppressing and Compensating for the Threshold Voltage Degradation of Hydrogenated Amorphous Silicon Thin Film Transistors

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概要

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• A new hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) pixel circuit for active-matrix organic light emission diodes (AM-OLEDs), which significantly compensates the OLED current degradation by memorizing the threshold voltage of driving TFT and suppresses the threshold voltage shift of a-Si:H TFTs by negative bias annealing, is proposed and fabricated. During the first half of each frame, the driving TFT of the proposed pixel circuit supplies current to the OLED, which is determined by modified data voltage in the compensation scheme. The proposed pixel circuit was able to compensate the threshold voltage shift of the driving TFT as well as the OLED. During the remaining half of each frame, the proposed pixel circuit induces the recovery of the threshold voltage degradation of a-Si:H TFTs owing to the negative bias annealing. The experimental results show that the proposed pixel circuit was able to successfully compensate for the OLED current degradation and suppress the threshold voltage degradation of the driving TFT.

• 2009-03-25

著者

• Lee Won-kyu

  School Of Physics Seoul National University

• Han Min-koo

  School Of Electrical Eng. & Computer Science #50 Seoul National University

• Shin Hee-Sun

  School of Electrical Engineering #50, Seoul National University, 151-742 Seoul, Korea

• Shin Hee-Sun

  School of Electrical Engineering and Computer Science #50, Seoul National University, San 56-1 Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea

• Park Sang-Guen

  School of Electrical Engineering and Computer Science #50, Seoul National University, San 56-1 Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea

• Kuk Seung-Hee

  School of Electrical Engineering and Computer Science #50, Seoul National University, San 56-1 Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea

• Lee Won-Kyu

  School of Electrical Engineering and Computer Science #50, Seoul National University, San 56-1 Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea

• Lee Won-Kyu

  School of Electrical Engineering #50, Seoul National University, Shinlim-dong, Gwanak-gu, Seoul 151-742, Korea

• Han Min-Koo

  School of Electrical al Engineering and Computer Science #50, Seoul National University, Seoul 151-742, Korea

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