Low-Temperature Polycrystalline Silicon Thin-Film Transistor-Based Micro Light-Emitting Diode Pixel Circuit Using Quaternary Digital Pulse Width Modulation for Simple Structure and Short Delay Time

IF 4.1 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Electron Device Letters Pub Date : 2025-01-28 DOI:10.1109/LED.2025.3535586

Hwarim Im;Eun Kyo Jung;Hye-Won Woo;Kook Chul Moon;Yong-Sang Kim

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引用次数: 0

Abstract

We propose a low-temperature polycrystalline silicon thin-film transistor (TFT)-based micro light-emitting diode (

$\mu $

LED) pixel circuit using quaternary digital pulse width modulation (PWM). The proposed circuit uses a stepwise control signal to modulate the emission time of each subframe in four levels, thereby reducing the number of subframes by half compared with conventional binary digital driving. Because the stepwise control signal can directly change the PWM driving TFT from off-state to on-state, the proposed circuit exhibits a short delay time of

$1.83~\mu $

s and low luminance variations of 3.45% without requiring a compensation structure for the threshold voltage of the PWM driving TFT. The proposed pixel circuit can be efficiently used in high-quality

$\mu $

LED displays, ensuring a stable operation.

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基于低温多晶硅薄膜晶体管的四元数字脉宽调制微发光二极管像素电路结构简单，延迟时间短

我们提出了一种基于低温多晶硅薄膜晶体管（TFT）的微型发光二极管（$\mu $ LED）像素电路，采用四元数字脉宽调制（PWM）。该电路采用一阶跃控制信号对每个子帧的发射时间进行4级调制，与传统的二进制数字驱动相比，减少了一半的子帧数量。由于阶跃控制信号可以直接将PWM驱动TFT从关态变为通态，因此该电路具有1.83~ 3.45%的低延迟时间和3.45%的低亮度变化，而无需对PWM驱动TFT的阈值电压进行补偿结构。所提出的像素电路可以有效地应用于高质量的LED显示屏中，确保其稳定运行。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Electron Device Letters 工程技术-工程：电子与电气

CiteScore

8.20

自引率

10.20%

发文量

551

审稿时长

1.4 months

期刊介绍： IEEE Electron Device Letters publishes original and significant contributions relating to the theory, modeling, design, performance and reliability of electron and ion integrated circuit devices and interconnects, involving insulators, metals, organic materials, micro-plasmas, semiconductors, quantum-effect structures, vacuum devices, and emerging materials with applications in bioelectronics, biomedical electronics, computation, communications, displays, microelectromechanics, imaging, micro-actuators, nanoelectronics, optoelectronics, photovoltaics, power ICs and micro-sensors.