Senior Researcher, Visionox
Presentation Title :
Reliability Test and Failure Analysis of Foldable AMOLED Display Module
In recent years, growing interest has been focused on developing foldable display for next-generation portable consumer electronic devices. Active-matrix organic light-emitting diodes (AMOLEDs) are regarded as the most promising candidate for foldable display because of the inherent structural advantages . From the perspective of foldable electronics, challenges including structure design, stress control, and reliability issues should be taken into consideration . In particular, the mass production and commercial application of foldable AMOLED display greatly depends on product reliability, such as folding cycles, anti-scratch reliability and impact resistance.
In this work, dynamic bending tests, surface hardness tests, and ball/pen drop tests were studied on a series of 7.2-inch foldable AMOLED display modules, integrating AMOLED panel, polarizer, touch sensor, back plate film, cover film, etc. On the basis of innovative design and optimized processing condition, the display module exhibited good reliability. The 7.2-inch AMOLED display module passed 200,000 repeat folding times with 5mm radius, performed in outward direction. Destructive tests were carried out, and the possible failure modes were analyzed, in combination with simulation results. It was found that stress concentration could either result in film peeling during bending test, or lead to pixel damage while suffered from external impact. Our work sheds light on the reliability issues of foldable AMOLED display module, and we believe foldable smartphones will soon unfold in front of the world.
 C. Li, G. Huang, L. Duan and Y. Qiu, Materials China. 35, 101 (2016).
 K. Hu, S. Gao, Q. Shan, X. Yang, T. Zhang, L. Lin, X. Gao and X. Huang, IMID 2015 Digest, P1-21
Genmao Huang joined Visionox Co., Ltd. after receiving his Ph.D. degree in chemistry from Tsinghua University in 2016. His work focuses on processing research of LTPS and IGZO array backplanes, and technology development of flexible AMOLED display module. He has been devoted to the research and development of foldable AMOLED display full module, such as ”transformable folding flexible screen full module product” and ”foldable AMOLED display All-in-One product” showed in SID display week 2018. In recent five years, he has published 10 peer-reviewed journal and conference papers, and applied for over 10 patents.
Visionox Co., Ltd. is a high-tech enterprise focusing on OLED technology development. Visionox has become a leading enterprise of OLED industry till now,integrating R&D, mass production, marketing and sales. The PMOLED and AMOLED products of Visionox have been widely applied in consumer electronics, industrial control instruments, financial communications and other fields. Moreover, Visionox has occupied the front rank of PMOLED market share around the world for years, and is one of the few enterprises capable of conducting AMOLED mass production.