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京东方科技集团股份有限公司,北京 100176
Received:29 December 2021,
Revised:17 February 2022,
Published:05 April 2022
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He-jin WANG, Xue-kai YANG, Song ZHANG, et al. Application and development of polyimide in foldable AMOLED displays[J]. Chinese journal of liquid crystals and displays, 2022, 37(4): 451-458.
He-jin WANG, Xue-kai YANG, Song ZHANG, et al. Application and development of polyimide in foldable AMOLED displays[J]. Chinese journal of liquid crystals and displays, 2022, 37(4): 451-458. DOI: 10.37188/CJLCD.2021-0348.
柔性显示以其轻薄、不易破坏、可弯折的特点受到消费领域的关注,最近几年柔性产品从初期的边缘弯曲手机发展到可折叠手机,目前折叠AMOLED显示屏已成为高端移动手机终端产品的标志。显示器件从刚性发展到折叠离不开材料科技的进步,聚酰亚胺材料的发展有效推动了显示形态的创新。柔性基板和柔性盖板是聚酰亚胺在折叠AMOLED显示中最重要的应用。本文介绍了柔性AMOLED用的基板材料基本性能,如耐高温、低膨胀、高平整、可分离,同时介绍了针对可折叠柔性盖板材料需要的基本性能,如高透明、抗冲击、耐蠕变、可弯折。本文基于京东方在折叠显示开发过程中的经历,综述了聚酰亚胺材料在柔性基板和柔性盖板两个关键资材方面的发展历程及工业化应用情况,并对聚酰亚胺材料的未来发展方向进行了展望。
Flexible display has attracted much attention from consumer for its light weight, ultra slim, durable and foldable properties. In the last few years, flexible display has evolved from edge curved display to foldable display. Now foldable AMOLED display is widely accepted as a standard configuration of high-tech mobile phone. Advances in polyimide material technology have played an important role in the innovation from rigid display to foldable display. In this article, the basic performance of flexible substrate is introduced, including thermal stability, low thermal expansion, surface performance and small separating force in debonding process. Flexible cover performance is also introduced, including transparency, shock resistance, creep resistance and foldability. Flexible substrate and flexible cover are important application of polyimide in foldable AMOLED. Based on BOE foldable AMOLED development process, this progress report reviews the commercial application development of polyimide material in flexible substrate and cover. Finally, the development tendency of polyimide in display is prospected.
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