New Current-Scaling Pixel Circuit Compensating Non uniform Electrical Characteristics for Active Matrix Organic Light Emitting Diode

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概要

• 論文の詳細を見る

• We have proposed and successfully fabricated a new serial current mirror pixel design for an active-matrix organic light-emitting diode which consists of four polycrystalline silicon thin-film transistors (poly-Si TFTs) and one capacitor. The non uniformity of OLED current ($I_{\text{OLED}}$) due to the nature of a poly-Si TFT is considerably suppressed. Our experimental results show that the non uniformity of $I_{\text{OLED}}$ due to threshold voltage and mobility variation is around 7% whereas that of $I_{\text{OLED}}$ is about 25% in the conventional 2-TFT pixel. When supply voltage decreases from 10 V to 9.5 V, the non uniformity of OLED current is suppressed to 2.2% whereas that of OLED current is 35% in the 2-TFT pixel. The proposed pixel can successfully compensate the variation of the electrical characteristics of the poly-Si TFTs as well as provide uniform OLED current despite the supply voltage drop.

• 2006-05-30

著者

• LEE Jae-Hoon

  School of Electrical Engineering & Computer Science Kyungpook National University

• Kim Chang-dong

  Lg Philips Lcd R&d Center

• 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, Seoul, 151-742, Korea

• Nam Woo-Jin

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

• Kim Chang-Yeon

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

• Lee Jae-Hoon

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

• Kim Chang-Dong

  LG Philips, LCD R&D Center, Kyongki-Do, 431-080, Korea

• Han Min-Koo

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

• Han Min-Koo

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

• Nam Woo-Jin

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

• Nam Woo-Jin

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

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