Zobrazit v EDS

A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression

Uloženo v:
Podrobná bibliografie
Název: A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression
Autoři: Kyeong-Soo Kang, Ji-Hwan Park, Chanjin Park, Ji-Ho Lee, Soo-Yeon Lee
Zdroj: IEEE Access, Vol 11, Pp 135915-135921 (2023)
Informace o vydavateli: Institute of Electrical and Electronics Engineers (IEEE), 2023.
Rok vydání: 2023
Témata: MicroLED, LTPO, inverter, PWM, Electrical engineering. Electronics. Nuclear engineering, TFT, pixel circuit, TK1-9971
Popis: In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode ( $\mu$ LED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with a low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under $\mu$ s level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of $\mu$ s. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations.
Druh dokumentu: Article
ISSN: 2169-3536
DOI: 10.1109/access.2023.3337889
Přístupová URL adresa: https://doaj.org/article/840eec5c9f23471aa3d9e07f3d5e61b2
Rights: CC BY NC ND
Přístupové číslo: edsair.doi.dedup.....cd924981bf1ddd02bfd97db533e5dfbb
Databáze: OpenAIRE
Popis
Abstrakt:In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode ( $\mu$ LED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with a low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under $\mu$ s level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of $\mu$ s. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations.
ISSN:21693536
DOI:10.1109/access.2023.3337889