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Inverter-Based MicroLED Pixel Circuit Using LTPO TFTs Achieving Submicrosecond Pulse-Width Modulation With Low Power Consumption Through Dynamic SWEEP Generation

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Název: Inverter-Based MicroLED Pixel Circuit Using LTPO TFTs Achieving Submicrosecond Pulse-Width Modulation With Low Power Consumption Through Dynamic SWEEP Generation
Autoři: Kyeong-Soo Kang, Ji-Hwan Park, Chanjin Park, Ji-Ho Lee, Soo-Yeon Lee
Zdroj: IEEE Access, Vol 13, Pp 65348-65355 (2025)
Informace o vydavateli: Institute of Electrical and Electronics Engineers (IEEE), 2025.
Rok vydání: 2025
Témata: MicroLED, LTPO, inverter, PWM, Electrical engineering. Electronics. Nuclear engineering, TFT, pixel circuit, TK1-9971
Popis: In this paper, we propose a pixel circuit for micro light-emitting diode displays based on low-temperature poly-Si oxide thin-film transistors. The proposed pixel circuit employs a dynamic SWEEP generation (DSG) scheme with an inverter, which steepens the slope of the internally generated SWEEP signal as the gray level decreases. Simulation results demonstrate that the proposed circuit achieves pulse-width modulation (PWM) down to a submicrosecond level, approximately $0.6~\mu $ s, with a falling time of $0.05~\mu $ s. This nearly ideal PWM operation enables the accurate expression of the lowest gray level down to 3 G. The proposed circuit also exhibited enhanced current uniformity and reduced inverter power consumption in low-gray levels. The average current error rate was less than 0.5% at 3 G, and the average inverter power in the mid- to low-gray levels was significantly reduced. This operational advancement was attributed to the adoption of a DSG scheme in the pixel circuit.
Druh dokumentu: Article
ISSN: 2169-3536
DOI: 10.1109/access.2025.3559546
Přístupová URL adresa: https://doaj.org/article/eb5cd87a839d4684ad43ead2c022ec13
Rights: CC BY NC ND
Přístupové číslo: edsair.doi.dedup.....2c4c51a5cb7b0b797ffc4ec5fa54a820
Databáze: OpenAIRE
Popis
Abstrakt:In this paper, we propose a pixel circuit for micro light-emitting diode displays based on low-temperature poly-Si oxide thin-film transistors. The proposed pixel circuit employs a dynamic SWEEP generation (DSG) scheme with an inverter, which steepens the slope of the internally generated SWEEP signal as the gray level decreases. Simulation results demonstrate that the proposed circuit achieves pulse-width modulation (PWM) down to a submicrosecond level, approximately $0.6~\mu $ s, with a falling time of $0.05~\mu $ s. This nearly ideal PWM operation enables the accurate expression of the lowest gray level down to 3 G. The proposed circuit also exhibited enhanced current uniformity and reduced inverter power consumption in low-gray levels. The average current error rate was less than 0.5% at 3 G, and the average inverter power in the mid- to low-gray levels was significantly reduced. This operational advancement was attributed to the adoption of a DSG scheme in the pixel circuit.
ISSN:21693536
DOI:10.1109/access.2025.3559546