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Flexible PLED displays and related technologies

机译:柔性PLED显示器和相关技术

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Flexible, free shape displays are the enabling technology for new robust, lightweight, extremely thin, portable electronic devices. Polymer Light Emitting Diodes (PLED) are especially suited for these applications, due to their fast response time, low voltage, high luminous efficiency and viewing angle performance. On the other hand, PLED displays are extremely sensitive to moisture and oxygen. Substrate materials provided with high performance hermetic and conducting layers are therefore an essential component for manufacturing these flexible devices. Polymer based substrates provide the necessary mechanical flexibility; they also require several thin, brittle, functional inorganic layers such diffusion barriers and transparent electrodes. The structural integrity, dimensional stability and thermal properties of the substrate stack are crucial to insure device functionality and reliability. For polymer-based substrate several effects lead to dimensional variation of the substrates, such as solvent uptake, physical ageing of the polymer base, thermal expansion and stress induced deformations. These effects must be taken into account to successfully perform classic photolithographic steps. Ink-jet printing is a critical enabling technology for flexible PLED displays, providing a customizable means to dispense solution-based polymers onto a flexible substrate, allowing for multi-color devices. On the other hand, IJP must meet several challenges, especially to comply with industrial applications. For example, accurate landing position of the droplets to form homogeneous hole-transport and electroluminescent layers as well as good wetting characteristic of the substrates must be obtained with reliable high throughput techniques.
机译:柔性,自由形状的显示器是用于新型坚固,轻便,极薄的便携式电子设备的使能技术。聚合物发光二极管(PLED)由于具有快速的响应时间,低电压,高发光效率和视角性能,因此特别适合这些应用。另一方面,PLED显示器对水分和氧气极为敏感。因此,具有高性能气密和导电层的基底材料是制造这些柔性器件的重要组成部分。聚合物基基材提供必要的机械柔韧性;它们还需要几个薄而脆的功能性无机层,例如扩散阻挡层和透明电极。衬底堆叠的结构完整性,尺寸稳定性和热性能对于确保器件功能和可靠性至关重要。对于基于聚合物的基材,多种影响导致基材的尺寸变化,例如溶剂吸收,聚合物基础的物理老化,热膨胀和应力引起的变形。为了成功执行经典的光刻步骤,必须考虑这些影响。喷墨打印是用于柔性PLED显示器的一项关键技术,它提供了一种可自定义的方式来将基于溶液的聚合物分配到柔性基板上,从而实现多色设备。另一方面,IJP必须应对多个挑战,尤其是要满足工业应用的要求。例如,必须使用可靠的高通量技术获得形成均匀的空穴传输层和电致发光层的液滴的精确降落位置以及基底的良好润湿特性。

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