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

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Article number9378775
Pages (from-to)365-372
Number of pages8
JournalIEEE Journal of the Electron Devices Society
Volume9
DOIs
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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