用于柔性AMOLED显示的高性能聚酰亚胺衬底

有机发光显示（AMOLED）以其高画质、宽色域、护眼健康、可弯折等优异特性赢得学界和业界的高度关注，成为当今显示领域研究的前沿和热点。但是，可靠性一直是柔性显示大规模应用的瓶颈，其中的关键问题是柔性衬底的耐热性、力学性能以及化学稳定性研究一直没有取得实质性突破。破解柔性显示性能劣化的难题，一直都是柔性衬底材料研究和工艺技术的核心任务，也是柔性显示发展面临的迫切需求。因此，本项目拟深入研究满足柔性AMOLED显示应用需求的高性能聚酰亚胺（PI）衬底。首先，研究PI衬底的成膜工艺、耐热稳定性和残余应力等特性，提高柔性显示屏的可靠性；然后，提出一种可承受较高工艺温度的低损伤力学解离方法，有效解决PI衬底与玻璃基板间的粘附与解离困难问题；最后，设计一种带有光学结构的透明PI衬底，提高柔性OLED的光取出效率。并尝试建立柔性PI薄膜性能的一般评价方法，以提升PI性能需求与柔性显示应用之间的系统联系。

Active matrix organic light emitting display (AMOLED) possessing excellent properties, such as high quality picture, wide color gamut, good for eyes, flexible or bending, attracts much attention in research and industry, become the frontier and hot spot of new display research. A key problem, which AMOLED based on flexible substrate materials faced, is long time reliability. This problem result in low yields. The core problem which affect the stability is that the flexible substrate does not make breaking through so far. To solve the problem of display performance degradation of AMOLED caused by its substrate heat resistance, mechanical properties and chemical stability, especially for AMOLED using flexible substrates, is the main task for the application requirement. Therefore, this proposal intends to further study the high-performance polyimide substrates that meet the requirements of flexible AMOLED display applications. Firstly, the film forming process, thermal stability and residual stress of PI substrate were studied to improve the reliability of the flexible display. Then, a low damage mechanical dissociation method which can bear higher process temperature is proposed to effectively solve the difficult problem of adhesion and dissociation between PI substrate and glass substrate. Finally, a transparent PI substrate with optical structure is designed to improve the light extraction efficiency of flexible OLED. And try to establish a general evaluation method of the performance of flexible PI film, in order to improve the system relationship between PI performance requirements and flexible display applications.