A New Analog PWM Pixel Circuit With Metal Oxide TFTs for Micro-LED Displays

被引：28

作者：

Zou, Pei-An ^{[1
]}

Xu, Yan-Gang ^{[1
]}

Liu, Chun ^{[1
]}

Zhang, Li-Rong ^{[1
]}

Zhang, Jin-Hui ^{[2
]}

Yuan, Yi-Kai ^{[1
,2
]}

Cai, Wei ^{[3
]}

Han, Shao-Hu ^{[1
]}

Zhou, Lei ^{[4
]}

Xu, Miao ^{[1
]}

Wang, Lei ^{[1
]}

Wu, Wei-Jing ^{[1
]}

Peng, Jun-Biao ^{[1
]}

机构：

[1] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China

[2] Foshan NationStar Optoelect Co Ltd, Foshan, Peoples R China

[3] Ji Hua Lab, Foshan 528000, Peoples R China

[4] New Vis Optoelect Technol Co Ltd, Guangzhou 510530, Peoples R China

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 2022年 / 69卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Analog pulsewidth modulation (PWM) driving method; compensation; metal oxide (MO) thin-film transistors (TFTs); micro-light-emitting diode (LED) displays; pixel circuit;

D O I：

10.1109/TED.2022.3178363

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This article presents a new uncompensated analog pulsewidth modulation (PWM) pixel circuit employing pull-up control for micro-light-emitting diode (LED) display. The time of emitting light for the micro-LED working at the constant current is modulated by the analog data voltage. A compensated pixel circuit is also further developed to improve the display uniformity by compensating the threshold voltage shift of PWM thin-film transistor (TFT) and driving TFT. Based on the back-channel etch (BCE) metal oxide TFTs process, 16 x GGG x 29 LED array with the uncompensated pixel circuit and 16 x G x 15 LED array with the compensated pixel circuit are simultaneously fabricated on the same glass substrate. Compared with the uncompensated pixel circuit array, the display uniformity of the compensated pixel circuit array is improved from 74% to 88%.

引用

页码：4306 / 4311

页数：6

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