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3T0.5C Compensating pixel circuit with all p-type LTPS-TFTs for AMOLED displays.

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Bibliographic Details
Title: 3T0.5C Compensating pixel circuit with all p-type LTPS-TFTs for AMOLED displays.
Authors: Fan, Ching-Lin1,2 clfan@mail.ntust.edu.tw, Chen, Chun-Yuan2, Tseng, Fan-Ping2, Yang, Chuang-Cheng2, Chien, Kuo-En1, Hsiao, Yu-Hao2
Source: Displays. Jul2018, Vol. 53, p8-13. 6p.
Subjects: Electric circuits, Thin film transistors, P-type semiconductors, Polycrystalline silicon, Threshold voltage, Capacitors
Abstract: A novel pixel circuit with low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) for driving active-matrix organic light-emitting diode (AMOLED) displays is proposed. The pixel circuit is built on two adjacent pixels with six p-type LTPS-TFTs and a capacitor, and thus the equivalent circuit is 3T0.5C in each layout area, which has a superior aperture ratio. The pixel circuit can compensate for the threshold voltage (V TH ) deviation of the driving TFT and provide a reverse bias on the OLED to ameliorate the OLED’s lifetime. The simulation results show that the pixel circuit can provide a stable driving current to AMOLED displays and the average error rate of the driving current was 1.8% when the driving TFT threshold voltage deviated by ±0.33 V. Therefore, the proposed pixel circuit with a superior aperture ratio can show high immunity to the driving TFT threshold voltage deviation and significantly improve the uniformity of brightness of AMOLED displays. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A novel pixel circuit with low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) for driving active-matrix organic light-emitting diode (AMOLED) displays is proposed. The pixel circuit is built on two adjacent pixels with six p-type LTPS-TFTs and a capacitor, and thus the equivalent circuit is 3T0.5C in each layout area, which has a superior aperture ratio. The pixel circuit can compensate for the threshold voltage (V TH ) deviation of the driving TFT and provide a reverse bias on the OLED to ameliorate the OLED’s lifetime. The simulation results show that the pixel circuit can provide a stable driving current to AMOLED displays and the average error rate of the driving current was 1.8% when the driving TFT threshold voltage deviated by ±0.33 V. Therefore, the proposed pixel circuit with a superior aperture ratio can show high immunity to the driving TFT threshold voltage deviation and significantly improve the uniformity of brightness of AMOLED displays. [ABSTRACT FROM AUTHOR]
ISSN:01419382
DOI:10.1016/j.displa.2018.04.001