A Pixel Circuit With Improved Luminance Uniformity and Flicker for AMOLED Displays With a Wide VRR Range of 15 Hz to 360 Hz

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.2025.3535717

Younsik Kim;Sung-Min Wee;Kyunghoon Chung;Byungchang Yu;Jaemyung Lim;Oh-Kyong Kwon

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Abstract

This letter proposes a 6T2C pixel circuit designed for LTPS-based AMOLED displays to improve luminance uniformity and reduce flicker across a wide range of variable refresh rates (VRRs). The proposed circuit employs a two-step compensation method to address variations in the threshold voltage and subthreshold slope of driving thin-film transistors (TFTs), improving luminance uniformity. Additionally, it minimizes the hysteresis effect of TFTs using an inducing hole-trapping technique, resulting in lower flicker. The proposed pixel circuit was verified with 48 samples for a 5.8-inch QHD AMOLED display, achieving notable reductions in emission current errors (ECEs) within a VRR range of 15 Hz to 360 Hz. The luminance uniformity performance was improved compared to a previous 7T2C circuit, with measured spatial ECEs of +3.4/−3.4 LSB versus +4.1/−4.2 LSB at the 256th gray level. The flicker performance was also improved, with measured temporal ECEs of +0.4 LSB and −1.1 LSB versus −0.8 LSB and −3.2 LSB at the 16th and 256th gray levels, respectively.

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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.