Simultaneous Emission AC-OLED Pixel Circuit for Extended Lifetime of OLED Display

Ki Hyuk Seol; Young In Kim; Seungjun Park; Hyoungsik Nam

doi:10.1109/JEDS.2018.2859271

Simultaneous Emission AC-OLED Pixel Circuit for Extended Lifetime of OLED Display

Ki Hyuk Seol, Young In Kim, Seungjun Park, Hyoungsik Nam

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

This paper demonstrates a pixel circuit of seven thin film transistors (TFTs) and two capacitors that drives an AC driven OLED (AC-OLED) at a simultaneous emission scheme. Because the AC-OLED is composed of two OLED units connected in opposite directions, the proposed circuit drives the current programmed once during a frame time in both ways. Since one OLED unit emits the light for about half frame time, the lifetime of OLEDs is ameliorated substantially. In addition, the proposed pixel circuit allows threshold voltage and supply voltage variations to be compensated. SPICE simulation results with a p-channel low temperature poly-silicon TFT model show that the average current non-uniformities are improved to 1.19% and 3.37% for threshold voltage and supply voltage variations of ±0.5 V, respectively.

Original language	English
Article number	8418746
Pages (from-to)	835-840
Number of pages	6
Journal	IEEE Journal of the Electron Devices Society
Volume	6
DOIs	https://doi.org/10.1109/JEDS.2018.2859271
Publication status	Published - 2018

Bibliographical note

Publisher Copyright:
© 2013 IEEE.

Keywords

AC-OLED
TFT
compensation
image-sticking
lifetime
simultaneous emission

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10.1109/JEDS.2018.2859271

Cite this

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title = "Simultaneous Emission AC-OLED Pixel Circuit for Extended Lifetime of OLED Display",

abstract = "This paper demonstrates a pixel circuit of seven thin film transistors (TFTs) and two capacitors that drives an AC driven OLED (AC-OLED) at a simultaneous emission scheme. Because the AC-OLED is composed of two OLED units connected in opposite directions, the proposed circuit drives the current programmed once during a frame time in both ways. Since one OLED unit emits the light for about half frame time, the lifetime of OLEDs is ameliorated substantially. In addition, the proposed pixel circuit allows threshold voltage and supply voltage variations to be compensated. SPICE simulation results with a p-channel low temperature poly-silicon TFT model show that the average current non-uniformities are improved to 1.19% and 3.37% for threshold voltage and supply voltage variations of ±0.5 V, respectively.",

keywords = "AC-OLED, TFT, compensation, image-sticking, lifetime, simultaneous emission",

author = "Seol, {Ki Hyuk} and Kim, {Young In} and Seungjun Park and Hyoungsik Nam",

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doi = "10.1109/JEDS.2018.2859271",

language = "English",

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T1 - Simultaneous Emission AC-OLED Pixel Circuit for Extended Lifetime of OLED Display

AU - Seol, Ki Hyuk

AU - Kim, Young In

AU - Park, Seungjun

AU - Nam, Hyoungsik

PY - 2018

Y1 - 2018

N2 - This paper demonstrates a pixel circuit of seven thin film transistors (TFTs) and two capacitors that drives an AC driven OLED (AC-OLED) at a simultaneous emission scheme. Because the AC-OLED is composed of two OLED units connected in opposite directions, the proposed circuit drives the current programmed once during a frame time in both ways. Since one OLED unit emits the light for about half frame time, the lifetime of OLEDs is ameliorated substantially. In addition, the proposed pixel circuit allows threshold voltage and supply voltage variations to be compensated. SPICE simulation results with a p-channel low temperature poly-silicon TFT model show that the average current non-uniformities are improved to 1.19% and 3.37% for threshold voltage and supply voltage variations of ±0.5 V, respectively.

AB - This paper demonstrates a pixel circuit of seven thin film transistors (TFTs) and two capacitors that drives an AC driven OLED (AC-OLED) at a simultaneous emission scheme. Because the AC-OLED is composed of two OLED units connected in opposite directions, the proposed circuit drives the current programmed once during a frame time in both ways. Since one OLED unit emits the light for about half frame time, the lifetime of OLEDs is ameliorated substantially. In addition, the proposed pixel circuit allows threshold voltage and supply voltage variations to be compensated. SPICE simulation results with a p-channel low temperature poly-silicon TFT model show that the average current non-uniformities are improved to 1.19% and 3.37% for threshold voltage and supply voltage variations of ±0.5 V, respectively.

KW - AC-OLED

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KW - compensation

KW - image-sticking

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KW - simultaneous emission

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Simultaneous Emission AC-OLED Pixel Circuit for Extended Lifetime of OLED Display

Abstract

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Keywords

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