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

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

doi:10.1109/JEDS.2021.3065905

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

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

Department of Electrical Engineering

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

25 Citations (Scopus)

Abstract

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 (VTH) variation in a lowerature 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 VTH 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.

Original language	English
Article number	9378775
Pages (from-to)	365-372
Number of pages	8
Journal	IEEE Journal of the Electron Devices Society
Volume	9
DOIs	https://doi.org/10.1109/JEDS.2021.3065905
Publication status	Published - 2021

All Science Journal Classification (ASJC) codes

Biotechnology
Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/JEDS.2021.3065905

Cite this

@article{5e764ee144e4406aa703cd2d07b5c83b,

title = "AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays",

abstract = "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 (VTH) variation in a lowerature 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 VTH 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.",

author = "Lin, {Chih Lung} and Chen, {Sung Chun} and Deng, {Ming Yang} and Ho, {Yuan Hao} and Lin, {Chieh An} and Tsai, {Chia Ling} and Liao, {Wei Sheng} and Liu, {Chih I.} and Wu, {Chia En} and Peng, {Jia Tian}",

note = "Funding Information: 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 109-2622-E-006-019-CC2; and in part by the AU Optronics Corporation. Publisher Copyright: {\textcopyright} 2013 IEEE.",

year = "2021",

doi = "10.1109/JEDS.2021.3065905",

language = "English",

volume = "9",

pages = "365--372",

journal = "IEEE Journal of the Electron Devices Society",

issn = "2168-6734",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

AU - Lin, Chih Lung

AU - Chen, Sung Chun

AU - Deng, Ming Yang

AU - Ho, Yuan Hao

AU - Lin, Chieh An

AU - Tsai, Chia Ling

AU - Liao, Wei Sheng

AU - Liu, Chih I.

AU - Wu, Chia En

AU - Peng, Jia Tian

N1 - Funding Information: 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 109-2622-E-006-019-CC2; and in part by the AU Optronics Corporation. Publisher Copyright: © 2013 IEEE.

PY - 2021

Y1 - 2021

N2 - 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 (VTH) variation in a lowerature 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 VTH 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.

AB - 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 (VTH) variation in a lowerature 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 VTH 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.

UR - http://www.scopus.com/inward/record.url?scp=85103311013&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85103311013&partnerID=8YFLogxK

U2 - 10.1109/JEDS.2021.3065905

DO - 10.1109/JEDS.2021.3065905

M3 - Article

AN - SCOPUS:85103311013

SN - 2168-6734

VL - 9

SP - 365

EP - 372

JO - IEEE Journal of the Electron Devices Society

JF - IEEE Journal of the Electron Devices Society

M1 - 9378775

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this