A compensation method for variations in subthreshold slope and threshold voltage of thin-film transistors for AMOLED displays

Nack Hyeon Keum, Chong Chul Chai, Seong Kwan Hong, Oh-Kyong Kwon

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this paper, we propose a compensation method for variations in the subthreshold slope (SS) and threshold voltage (Vth) of the low-temperature polycrystalline silicon thin-film transistors (LTPS TFTs) in an attempt to improve the image quality of the active matrix organic light-emitting diode (AMOLED) displays for mobile applications. The proposed compensation method provides a uniform voltage to the OLED according to the gray level without being affected by variations in the SS and Vth of the LTPS TFTs. To verify the performance of the proposed compensation method, a test pattern, including two pixel circuits designed for 5.7-inch quadruple high-definition AMOLED display was fabricated and measured. The measurement results showed that the proposed compensation method achieved an emission current error of the pixel circuit of only ±3.1 LSB at the 255 th gray level. Therefore, the proposed compensation method is very suitable for AMOLED displays requiring high image quality.

Original languageEnglish
Article number8666716
Pages (from-to)462-469
Number of pages8
JournalIEEE Journal of the Electron Devices Society
Volume7
DOIs
StatePublished - 2019 Jan 1

Fingerprint

Organic light emitting diodes (OLED)
Thin film transistors
Threshold voltage
Display devices
Light
Silicon
Polysilicon
Image quality
Pixels
Mobile Applications
Temperature
Networks (circuits)
Compensation and Redress
Electric potential

Keywords

  • high image quality
  • organic light-emitting diode displays
  • pixel circuit
  • Thin film transistors

Cite this

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title = "A compensation method for variations in subthreshold slope and threshold voltage of thin-film transistors for AMOLED displays",
abstract = "In this paper, we propose a compensation method for variations in the subthreshold slope (SS) and threshold voltage (Vth) of the low-temperature polycrystalline silicon thin-film transistors (LTPS TFTs) in an attempt to improve the image quality of the active matrix organic light-emitting diode (AMOLED) displays for mobile applications. The proposed compensation method provides a uniform voltage to the OLED according to the gray level without being affected by variations in the SS and Vth of the LTPS TFTs. To verify the performance of the proposed compensation method, a test pattern, including two pixel circuits designed for 5.7-inch quadruple high-definition AMOLED display was fabricated and measured. The measurement results showed that the proposed compensation method achieved an emission current error of the pixel circuit of only ±3.1 LSB at the 255 th gray level. Therefore, the proposed compensation method is very suitable for AMOLED displays requiring high image quality.",
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A compensation method for variations in subthreshold slope and threshold voltage of thin-film transistors for AMOLED displays. / Keum, Nack Hyeon; Chai, Chong Chul; Hong, Seong Kwan; Kwon, Oh-Kyong.

In: IEEE Journal of the Electron Devices Society, Vol. 7, 8666716, 01.01.2019, p. 462-469.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - A compensation method for variations in subthreshold slope and threshold voltage of thin-film transistors for AMOLED displays

AU - Keum, Nack Hyeon

AU - Chai, Chong Chul

AU - Hong, Seong Kwan

AU - Kwon, Oh-Kyong

PY - 2019/1/1

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N2 - In this paper, we propose a compensation method for variations in the subthreshold slope (SS) and threshold voltage (Vth) of the low-temperature polycrystalline silicon thin-film transistors (LTPS TFTs) in an attempt to improve the image quality of the active matrix organic light-emitting diode (AMOLED) displays for mobile applications. The proposed compensation method provides a uniform voltage to the OLED according to the gray level without being affected by variations in the SS and Vth of the LTPS TFTs. To verify the performance of the proposed compensation method, a test pattern, including two pixel circuits designed for 5.7-inch quadruple high-definition AMOLED display was fabricated and measured. The measurement results showed that the proposed compensation method achieved an emission current error of the pixel circuit of only ±3.1 LSB at the 255 th gray level. Therefore, the proposed compensation method is very suitable for AMOLED displays requiring high image quality.

AB - In this paper, we propose a compensation method for variations in the subthreshold slope (SS) and threshold voltage (Vth) of the low-temperature polycrystalline silicon thin-film transistors (LTPS TFTs) in an attempt to improve the image quality of the active matrix organic light-emitting diode (AMOLED) displays for mobile applications. The proposed compensation method provides a uniform voltage to the OLED according to the gray level without being affected by variations in the SS and Vth of the LTPS TFTs. To verify the performance of the proposed compensation method, a test pattern, including two pixel circuits designed for 5.7-inch quadruple high-definition AMOLED display was fabricated and measured. The measurement results showed that the proposed compensation method achieved an emission current error of the pixel circuit of only ±3.1 LSB at the 255 th gray level. Therefore, the proposed compensation method is very suitable for AMOLED displays requiring high image quality.

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