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[International Conference] Large scale textile-based Organic Light Emitting Diodes(OLEDs) with high flexibility for Fashion Displays.
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Yunha Na, Seungyeop Choi, and Kyung Cheol Choi
IMID 2020 (International Meeting on Information Display), August , 2020
vol , no , pp
Recently, a physical form of electronic devices has changed as integrated circuit, communication and battery technology advance. One of the key features of this change is user-friendly point.1,2 For example, many electronics companies have been scrambling to launch their products in the form of watch under the name of ‘wearable device.’ But this type of devices is still brittle. For actual user-friendly feature, it is necessary to develop into ‘wearing device’ beyond ‘wearable device’. In this point of view, the best platform to apply is textile.
Various works have demonstrated highly flexible and efficient fabric-based OLEDs.3,4 In order to make devices in actual clothing and serve as information displays, application to large area is inevitable. If so, it can also be expected to be used as a fashion displays.Here we demonstrate several OLED devices in wider textile substrate area to make it more applicable to the actual device. In order to achieve this purpose, textile substrate structure with high uniformity of low roughness in large areas and corresponding planarization process method are required. In this reason, planarization process using the flatness of guide glass is used.5 As a result, this work obtains a luminance of more than 1000 nit required by outdoor displays and a current efficacy of more than 10 cd/A. Although it has large emitting area, it can be driven at low voltage. And its flexibility is measured by cantilever test, and the result is a cantilever length of 2.3cm which is highly flexible given that 50um PET has about 4.4cm of cantilever length. Also, it achieved uniformity of luminance more than 90 percentage at 9 points of emitting area. The demonstrated devices are shown in Figure 1 and its emitting area is 4,356mm2.