Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays

Po Cheng Lai, Mao Hsun Cheng, Li Wei Shih, Chih Lung Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This work proposes a simplified pixel circuit that involves only four low-temperature polycrystalline silicon (LTPS) thin-film transistors (TFTs) and two capacitors especially for high-resolution active matrix organic light-emitting diode (AMOLED) displays. The proposed circuit adopts the simultaneous emission driving method to extend the compensating time for precisely sensing the threshold voltage variation of driving TFTs. Moreover, the flicker phenomenon is ameliorated by adjusting the voltage level of ELVSS during the programming period. Simulation results show that the relative current error rates under various data voltages with VTH variation of driving TFT of ± 0.5 V are all less than 4.5%, demonstrating that the proposed pixel circuit can generate uniform driving currents flowing through OLEDs for high-quality images.

Original languageEnglish
Title of host publicationAM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices
Subtitle of host publicationTFT Technologies and FPD Materials, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9784990875374
DOIs
Publication statusPublished - 2019 Jul
Event26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, AM-FPD 2019 - Kyoto, Japan
Duration: 2019 Jul 22019 Jul 5

Publication series

NameAM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings

Conference

Conference26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, AM-FPD 2019
CountryJapan
CityKyoto
Period19-07-0219-07-05

Fingerprint

Organic light emitting diodes (OLED)
Thin film transistors
Polysilicon
Image quality
transistors
light emitting diodes
Pixels
pixels
Display devices
Networks (circuits)
high resolution
silicon
matrices
thin films
flicker
Electric potential
electric potential
programming
Threshold voltage
threshold voltage

All Science Journal Classification (ASJC) codes

  • Computer Graphics and Computer-Aided Design
  • Media Technology
  • Electronic, Optical and Magnetic Materials
  • Instrumentation

Cite this

Lai, P. C., Cheng, M. H., Shih, L. W., & Lin, C. L. (2019). Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays. In AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings [8830579] (AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.23919/AM-FPD.2019.8830579
Lai, Po Cheng ; Cheng, Mao Hsun ; Shih, Li Wei ; Lin, Chih Lung. / Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays. AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2019. (AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings).
@inproceedings{5bdb6c6c19054e39a7120e25b36e69a8,
title = "Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays",
abstract = "This work proposes a simplified pixel circuit that involves only four low-temperature polycrystalline silicon (LTPS) thin-film transistors (TFTs) and two capacitors especially for high-resolution active matrix organic light-emitting diode (AMOLED) displays. The proposed circuit adopts the simultaneous emission driving method to extend the compensating time for precisely sensing the threshold voltage variation of driving TFTs. Moreover, the flicker phenomenon is ameliorated by adjusting the voltage level of ELVSS during the programming period. Simulation results show that the relative current error rates under various data voltages with VTH variation of driving TFT of ± 0.5 V are all less than 4.5{\%}, demonstrating that the proposed pixel circuit can generate uniform driving currents flowing through OLEDs for high-quality images.",
author = "Lai, {Po Cheng} and Cheng, {Mao Hsun} and Shih, {Li Wei} and Lin, {Chih Lung}",
year = "2019",
month = "7",
doi = "10.23919/AM-FPD.2019.8830579",
language = "English",
series = "AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices",
address = "United States",

}

Lai, PC, Cheng, MH, Shih, LW & Lin, CL 2019, Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays. in AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings., 8830579, AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings, Institute of Electrical and Electronics Engineers Inc., 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, AM-FPD 2019, Kyoto, Japan, 19-07-02. https://doi.org/10.23919/AM-FPD.2019.8830579

Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays. / Lai, Po Cheng; Cheng, Mao Hsun; Shih, Li Wei; Lin, Chih Lung.

AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2019. 8830579 (AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays

AU - Lai, Po Cheng

AU - Cheng, Mao Hsun

AU - Shih, Li Wei

AU - Lin, Chih Lung

PY - 2019/7

Y1 - 2019/7

N2 - This work proposes a simplified pixel circuit that involves only four low-temperature polycrystalline silicon (LTPS) thin-film transistors (TFTs) and two capacitors especially for high-resolution active matrix organic light-emitting diode (AMOLED) displays. The proposed circuit adopts the simultaneous emission driving method to extend the compensating time for precisely sensing the threshold voltage variation of driving TFTs. Moreover, the flicker phenomenon is ameliorated by adjusting the voltage level of ELVSS during the programming period. Simulation results show that the relative current error rates under various data voltages with VTH variation of driving TFT of ± 0.5 V are all less than 4.5%, demonstrating that the proposed pixel circuit can generate uniform driving currents flowing through OLEDs for high-quality images.

AB - This work proposes a simplified pixel circuit that involves only four low-temperature polycrystalline silicon (LTPS) thin-film transistors (TFTs) and two capacitors especially for high-resolution active matrix organic light-emitting diode (AMOLED) displays. The proposed circuit adopts the simultaneous emission driving method to extend the compensating time for precisely sensing the threshold voltage variation of driving TFTs. Moreover, the flicker phenomenon is ameliorated by adjusting the voltage level of ELVSS during the programming period. Simulation results show that the relative current error rates under various data voltages with VTH variation of driving TFT of ± 0.5 V are all less than 4.5%, demonstrating that the proposed pixel circuit can generate uniform driving currents flowing through OLEDs for high-quality images.

UR - http://www.scopus.com/inward/record.url?scp=85073222676&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073222676&partnerID=8YFLogxK

U2 - 10.23919/AM-FPD.2019.8830579

DO - 10.23919/AM-FPD.2019.8830579

M3 - Conference contribution

AN - SCOPUS:85073222676

T3 - AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings

BT - AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices

PB - Institute of Electrical and Electronics Engineers Inc.

ER -

Lai PC, Cheng MH, Shih LW, Lin CL. Simplified Compensation Pixel Circuit Based on LTPS TFTs for High-Quality images of High-Resolution AMOLED Displays. In AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings. Institute of Electrical and Electronics Engineers Inc. 2019. 8830579. (AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings). https://doi.org/10.23919/AM-FPD.2019.8830579