AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

This work proposes a mini-LED driving circuit that adopts the pulse-width modulation (PWM) driving method for use in a liquid-crystal display (LCD) backlight. The proposed circuit can compensate for the threshold voltage (<inline-formula> <tex-math notation="LaTeX">$\text{V}_{\...

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Autores principales:	Chih-Lung Lin, Sung-Chun Chen, Ming-Yang Deng, Yuan-Hao Ho, Chieh-An Lin, Chia-Ling Tsai, Wei-Sheng Liao, Chih-I Liu, Chia-En Wu, Jia-Tian Peng
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Active-matrix display LCD backlight high dynamic range mini-LED pulse-width modulation power consumption Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/a65f27eba81b4639b0aecdd0173aca05
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spelling	oai:doaj.org-article:a65f27eba81b4639b0aecdd0173aca052021-11-19T00:01:37ZAM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays2168-673410.1109/JEDS.2021.3065905https://doaj.org/article/a65f27eba81b4639b0aecdd0173aca052021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9378775/https://doaj.org/toc/2168-6734This work proposes a mini-LED driving circuit that adopts the pulse-width modulation (PWM) driving method for use in a liquid-crystal display (LCD) backlight. The proposed circuit can compensate for the threshold voltage (<inline-formula> <tex-math notation="LaTeX">$\text{V}_{\mathrm{ TH}}$ </tex-math></inline-formula>) variation in a low-temperature poly-crystalline silicon thin-film transistor (LTPS TFT) and a VSS current-resistance (I-R) rise, to generate a stable driving current to power the mini-LED. Since the proposed circuit uses the PWM method, the mini-LED can be operated at the best luminance-efficacy point, minimizing the power consumption of the circuit. The electrical characteristic of fabricated LTPS TFTs are measured to establish a simulation model to demonstrate the feasibility of the proposed circuit. Simulation results demonstrate that the relative mini-LED current error rates are below 9% when the <inline-formula> <tex-math notation="LaTeX">$\text{V}_{\mathrm{ TH}}$ </tex-math></inline-formula> varies ± 0.3 V and VSS rises by 1 V. With respect to precise control of the gray level, the time shifts of current pulses are within 11.48 us over the whole grayscale. The improvement in the power consumption of the proposed circuit is more than 21% than that of a circuit that is driven by pulse amplitude modulation.Chih-Lung LinSung-Chun ChenMing-Yang DengYuan-Hao HoChieh-An LinChia-Ling TsaiWei-Sheng LiaoChih-I LiuChia-En WuJia-Tian PengIEEEarticleActive-matrix displayLCD backlighthigh dynamic rangemini-LEDpulse-width modulationpower consumptionElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Journal of the Electron Devices Society, Vol 9, Pp 365-372 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Active-matrix display LCD backlight high dynamic range mini-LED pulse-width modulation power consumption Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Active-matrix display LCD backlight high dynamic range mini-LED pulse-width modulation power consumption Electrical engineering. Electronics. Nuclear engineering TK1-9971 Chih-Lung Lin Sung-Chun Chen Ming-Yang Deng Yuan-Hao Ho Chieh-An Lin Chia-Ling Tsai Wei-Sheng Liao Chih-I Liu Chia-En Wu Jia-Tian Peng AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays
description	This work proposes a mini-LED driving circuit that adopts the pulse-width modulation (PWM) driving method for use in a liquid-crystal display (LCD) backlight. The proposed circuit can compensate for the threshold voltage (<inline-formula> <tex-math notation="LaTeX">$\text{V}_{\mathrm{ TH}}$ </tex-math></inline-formula>) variation in a low-temperature poly-crystalline silicon thin-film transistor (LTPS TFT) and a VSS current-resistance (I-R) rise, to generate a stable driving current to power the mini-LED. Since the proposed circuit uses the PWM method, the mini-LED can be operated at the best luminance-efficacy point, minimizing the power consumption of the circuit. The electrical characteristic of fabricated LTPS TFTs are measured to establish a simulation model to demonstrate the feasibility of the proposed circuit. Simulation results demonstrate that the relative mini-LED current error rates are below 9% when the <inline-formula> <tex-math notation="LaTeX">$\text{V}_{\mathrm{ TH}}$ </tex-math></inline-formula> varies ± 0.3 V and VSS rises by 1 V. With respect to precise control of the gray level, the time shifts of current pulses are within 11.48 us over the whole grayscale. The improvement in the power consumption of the proposed circuit is more than 21% than that of a circuit that is driven by pulse amplitude modulation.
format	article
author	Chih-Lung Lin Sung-Chun Chen Ming-Yang Deng Yuan-Hao Ho Chieh-An Lin Chia-Ling Tsai Wei-Sheng Liao Chih-I Liu Chia-En Wu Jia-Tian Peng
author_facet	Chih-Lung Lin Sung-Chun Chen Ming-Yang Deng Yuan-Hao Ho Chieh-An Lin Chia-Ling Tsai Wei-Sheng Liao Chih-I Liu Chia-En Wu Jia-Tian Peng
author_sort	Chih-Lung Lin
title	AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays
title_short	AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays
title_full	AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays
title_fullStr	AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays
title_full_unstemmed	AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays
title_sort	am pwm driving circuit for mini-led backlight in liquid crystal displays
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/a65f27eba81b4639b0aecdd0173aca05
work_keys_str_mv	AT chihlunglin ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT sungchunchen ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT mingyangdeng ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT yuanhaoho ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT chiehanlin ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT chialingtsai ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT weishengliao ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT chihiliu ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT chiaenwu ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays AT jiatianpeng ampwmdrivingcircuitforminiledbacklightinliquidcrystaldisplays
_version_	1718420686305755136

AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

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