Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays

Chih Lung Lin; Po Cheng Lai; Jui Hung Chang; Sung Chun Chen; Chia Ling Tsai; Jein Lun Koa; Mao Hsun Cheng; Li Wei Shih; Wei Chou Hsu

doi:10.1109/TED.2021.3067854

Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays

Chih Lung Lin, Po Cheng Lai, Jui Hung Chang, Sung Chun Chen, Chia Ling Tsai, Jein Lun Koa, Mao Hsun Cheng, Li Wei Shih, Wei Chou Hsu

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

13 Citations (Scopus)

Abstract

A new leakage-prevention pixel circuit is proposed to maintain the driving capability of its driving thin-film transistors (TFTs) at a low frame rate of 15 Hz for use in active-matrix organic light-emitting diode (AMOLED) displays. The proposed leakage-prevention mechanism generates a compensating leakage current that reduces the source-to-drain voltage of the switching TFT, thereby lessening the fluctuation of the stored driving voltage when the frame rate is reduced from 60 to 15 Hz. Moreover, the proposed circuit can compensate for the threshold voltage variation in low-temperature polycrystalline silicon TFTs (LTPS TFTs) and current-resistance drops in VDD lines. To validate the performance of the compensation and leakage prevention, simulation models based on the measurement of the fabricated LTPS TFTs and an organic light-emitting diode (OLED) are established. The experimental results confirm that the leakage current of the gate node is successfully suppressed from 50.34 to 1.25 pA by the proposed leakage-prevention mechanism. Also, within the long emission period, the highly uniform OLED currents at low, medium, and high gray levels are achieved, verifying the feasibility of the proposed pixel circuit.

Original language	English
Article number	9392116
Pages (from-to)	2313-2319
Number of pages	7
Journal	IEEE Transactions on Electron Devices
Volume	68
Issue number	5
DOIs	https://doi.org/10.1109/TED.2021.3067854
Publication status	Published - 2021 May

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TED.2021.3067854

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@article{175833ad2b10423283212b2f7a19a0a3,

title = "Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays",

abstract = "A new leakage-prevention pixel circuit is proposed to maintain the driving capability of its driving thin-film transistors (TFTs) at a low frame rate of 15 Hz for use in active-matrix organic light-emitting diode (AMOLED) displays. The proposed leakage-prevention mechanism generates a compensating leakage current that reduces the source-to-drain voltage of the switching TFT, thereby lessening the fluctuation of the stored driving voltage when the frame rate is reduced from 60 to 15 Hz. Moreover, the proposed circuit can compensate for the threshold voltage variation in low-temperature polycrystalline silicon TFTs (LTPS TFTs) and current-resistance drops in VDD lines. To validate the performance of the compensation and leakage prevention, simulation models based on the measurement of the fabricated LTPS TFTs and an organic light-emitting diode (OLED) are established. The experimental results confirm that the leakage current of the gate node is successfully suppressed from 50.34 to 1.25 pA by the proposed leakage-prevention mechanism. Also, within the long emission period, the highly uniform OLED currents at low, medium, and high gray levels are achieved, verifying the feasibility of the proposed pixel circuit.",

author = "Lin, {Chih Lung} and Lai, {Po Cheng} and Chang, {Jui Hung} and Chen, {Sung Chun} and Tsai, {Chia Ling} and Koa, {Jein Lun} and Cheng, {Mao Hsun} and Shih, {Li Wei} and Hsu, {Wei Chou}",

note = "Funding Information: Manuscript received November 1, 2020; revised January 28, 2021; accepted March 17, 2021. Date of publication March 31, 2021; date of current version April 22, 2021. This work was supported in part by the Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan, in part by the Ministry of Science and Technology of Taiwan under Project MOST 107-2221-E-006-188-MY3, and in part by the AU Optronics Corporation. The review of this article was arranged by Editor X. Guo. (Corresponding author: Chih-Lung Lin.) Chih-Lung Lin is with the Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan, and also with the Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (e-mail: cllin@ee.ncku.edu.tw). Publisher Copyright: {\textcopyright} 1963-2012 IEEE.",

year = "2021",

month = may,

doi = "10.1109/TED.2021.3067854",

language = "English",

volume = "68",

pages = "2313--2319",

journal = "IEEE Transactions on Electron Devices",

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T1 - Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays

AU - Lin, Chih Lung

AU - Lai, Po Cheng

AU - Chang, Jui Hung

AU - Chen, Sung Chun

AU - Tsai, Chia Ling

AU - Koa, Jein Lun

AU - Cheng, Mao Hsun

AU - Shih, Li Wei

AU - Hsu, Wei Chou

N1 - Funding Information: Manuscript received November 1, 2020; revised January 28, 2021; accepted March 17, 2021. Date of publication March 31, 2021; date of current version April 22, 2021. This work was supported in part by the Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan, in part by the Ministry of Science and Technology of Taiwan under Project MOST 107-2221-E-006-188-MY3, and in part by the AU Optronics Corporation. The review of this article was arranged by Editor X. Guo. (Corresponding author: Chih-Lung Lin.) Chih-Lung Lin is with the Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan, and also with the Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (e-mail: cllin@ee.ncku.edu.tw). Publisher Copyright: © 1963-2012 IEEE.

PY - 2021/5

Y1 - 2021/5

N2 - A new leakage-prevention pixel circuit is proposed to maintain the driving capability of its driving thin-film transistors (TFTs) at a low frame rate of 15 Hz for use in active-matrix organic light-emitting diode (AMOLED) displays. The proposed leakage-prevention mechanism generates a compensating leakage current that reduces the source-to-drain voltage of the switching TFT, thereby lessening the fluctuation of the stored driving voltage when the frame rate is reduced from 60 to 15 Hz. Moreover, the proposed circuit can compensate for the threshold voltage variation in low-temperature polycrystalline silicon TFTs (LTPS TFTs) and current-resistance drops in VDD lines. To validate the performance of the compensation and leakage prevention, simulation models based on the measurement of the fabricated LTPS TFTs and an organic light-emitting diode (OLED) are established. The experimental results confirm that the leakage current of the gate node is successfully suppressed from 50.34 to 1.25 pA by the proposed leakage-prevention mechanism. Also, within the long emission period, the highly uniform OLED currents at low, medium, and high gray levels are achieved, verifying the feasibility of the proposed pixel circuit.

AB - A new leakage-prevention pixel circuit is proposed to maintain the driving capability of its driving thin-film transistors (TFTs) at a low frame rate of 15 Hz for use in active-matrix organic light-emitting diode (AMOLED) displays. The proposed leakage-prevention mechanism generates a compensating leakage current that reduces the source-to-drain voltage of the switching TFT, thereby lessening the fluctuation of the stored driving voltage when the frame rate is reduced from 60 to 15 Hz. Moreover, the proposed circuit can compensate for the threshold voltage variation in low-temperature polycrystalline silicon TFTs (LTPS TFTs) and current-resistance drops in VDD lines. To validate the performance of the compensation and leakage prevention, simulation models based on the measurement of the fabricated LTPS TFTs and an organic light-emitting diode (OLED) are established. The experimental results confirm that the leakage current of the gate node is successfully suppressed from 50.34 to 1.25 pA by the proposed leakage-prevention mechanism. Also, within the long emission period, the highly uniform OLED currents at low, medium, and high gray levels are achieved, verifying the feasibility of the proposed pixel circuit.

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JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

IS - 5

M1 - 9392116

ER -

Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays

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