A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage

In this article, we propose a novel real-time threshold voltage (<inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula>) compensation method for AM-OLED display. The proposed method predicts <inline-formula> <tex-math notation=&qu...

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Autores principales:	Kyeong-Soo Kang, Jin-Kyu Lee, Ji-Min Kang, Soo-Yeon Lee
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	OLED threshold voltage compensation real-time JND Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/8b4119c78f4040de89fb11e306cdd017
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spelling	oai:doaj.org-article:8b4119c78f4040de89fb11e306cdd0172021-11-19T00:01:39ZA Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage2168-673410.1109/JEDS.2021.3058348https://doaj.org/article/8b4119c78f4040de89fb11e306cdd0172021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9352027/https://doaj.org/toc/2168-6734In this article, we propose a novel real-time threshold voltage (<inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula>) compensation method for AM-OLED display. The proposed method predicts <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> shift of driving thin-film transistors (TFTs) based on the equation derived from the sensing line charging with TFT’s drain current. The prediction equation requires two consecutive source node voltages to consider the mobility variation, and only takes hundreds of microseconds to predict <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> shift. It is short enough to monitor the real-time <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> degradation, since the prediction can be carried out during the vertical blank time. Also, very high prediction accuracy was confirmed through Smart SPICE simulation. We simulated severe mobility variation and <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> shift circumstances, and the simulation results showed that the prediction error was less than one just noticeable difference (JND) margin though out all gray levels. We expect that the proposed method can achieve more accurate and faster real-time <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> degradation compensation for high resolution and large-sized OLED displays than conventional one.Kyeong-Soo KangJin-Kyu LeeJi-Min KangSoo-Yeon LeeIEEEarticleOLEDthreshold voltagecompensationreal-timeJNDElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Journal of the Electron Devices Society, Vol 9, Pp 311-317 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	OLED threshold voltage compensation real-time JND Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	OLED threshold voltage compensation real-time JND Electrical engineering. Electronics. Nuclear engineering TK1-9971 Kyeong-Soo Kang Jin-Kyu Lee Ji-Min Kang Soo-Yeon Lee A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage
description	In this article, we propose a novel real-time threshold voltage (<inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula>) compensation method for AM-OLED display. The proposed method predicts <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> shift of driving thin-film transistors (TFTs) based on the equation derived from the sensing line charging with TFT’s drain current. The prediction equation requires two consecutive source node voltages to consider the mobility variation, and only takes hundreds of microseconds to predict <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> shift. It is short enough to monitor the real-time <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> degradation, since the prediction can be carried out during the vertical blank time. Also, very high prediction accuracy was confirmed through Smart SPICE simulation. We simulated severe mobility variation and <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> shift circumstances, and the simulation results showed that the prediction error was less than one just noticeable difference (JND) margin though out all gray levels. We expect that the proposed method can achieve more accurate and faster real-time <inline-formula> <tex-math notation="LaTeX">$V_{th}$ </tex-math></inline-formula> degradation compensation for high resolution and large-sized OLED displays than conventional one.
format	article
author	Kyeong-Soo Kang Jin-Kyu Lee Ji-Min Kang Soo-Yeon Lee
author_facet	Kyeong-Soo Kang Jin-Kyu Lee Ji-Min Kang Soo-Yeon Lee
author_sort	Kyeong-Soo Kang
title	A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage
title_short	A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage
title_full	A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage
title_fullStr	A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage
title_full_unstemmed	A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage
title_sort	novel real-time tft threshold voltage compensation method for am-oled using double sampling of source node voltage
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/8b4119c78f4040de89fb11e306cdd017
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A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage

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