据外媒报道,美国明尼苏达大学双城分校的研究人员发表在《科学进展》上的一项研究指出,他们制造出了首个利用3D打印技术的柔性OLED显示屏,这将有望大大降低OLED显示屏的成本。
由于OLED显示屏不需背光源、对比度高、厚度薄、视角广、反应速度快、使用温度范围广、构造及制程较简单等特点,正广泛用于各类电子产品中。由于OLED显示屏往往需要在大型、昂贵并且处于超清洁的设施中生产出来,导致其成本较高。为此,明尼苏达大学双城分校的研究人员计划发明一种成本更低的制造OLED显示屏的方法。
为此,研究人员尝试了采用3D打印生产OLED显示屏,为此定制了一台3D打印机,并尝试了两种不同的打印模式,最终成功打印出了一个边长1.5英寸,像素为64×64的OLED显示屏,并且每个像素都能够正常工作。此外,研究人员还对该OLED显示屏进行了2000次弯曲试验,而显示屏依旧能够正常工作,这意味着它将有望用于可穿戴设备中的柔性OLED显示屏。
研究人员表示,下一步,将计划打印一个更大的OLED显示器,并且该显示器的分辨率和亮度也将得到进一步的提高。OLED又称为有机电激光显示、有机发光半导体,属于一种电流型的有机发光器件,是通过载流子的注入和复合而致发光的现象,发光强度与注入的电流成正比。
The ability to fully 3D-print active electronic and optoelectronic devices will enable unique device form factors via strategies untethered from conventional microfabrication facilities. Currently, the performance of 3D-printed optoelectronics can suffer from nonuniformities in the solution-deposited active layers and unstable polymer-metal junctions. Here, we demonstrate a multimodal printing methodology that results in fully 3D-printed flexible organic light-emitting diode displays. The electrodes, interconnects, insulation, and encapsulation are all extrusion-printed, while the active layers are spray-printed. Spray printing leads to improved layer uniformity via suppression of directional mass transport in the printed droplets. By exploiting the viscoelastic oxide surface of the printed cathode droplets, a mechanical reconfiguration process is achieved to increase the contact area of the polymer-metal junctions. The uniform cathode array is intimately interfaced with the top interconnects. This hybrid approach creates a fully 3D-printed flexible 8 × 8 display with all pixels turning on successfully.
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