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首页> 外文会议>Sixth International Conference on Solid State Lighting >Evaluation of Inorganic and Organic Light-Emitting Diode Displays for Signage Application
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Evaluation of Inorganic and Organic Light-Emitting Diode Displays for Signage Application

机译：标牌应用的无机和有机发光二极管显示器的评估

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High-brightness, inorganic light-emitting diodes (LEDs) have been successfully utilized for edge-lighting of large displays for signage. Further interest in solid-state lighting technology has been fueled with the emergence of small molecule and polymer-based organic light-emitting diodes (OLEDs). In this paper, edgelit inorganic LED-based displays and state-of-the-art OLED-based displays are evaluated on the basis of electrical and photometric measurements. The reference size for a signage system is assumed to be 600 mm x 600mm based on the industrial usage. With the availability of high power light-emitting diodes, it is possible to develop edgelit signage systems of the standard size. These displays possess an efficacy of 18 lm/W. Although, these displays are environmentally friendly and efficient, they suffer from some inherent limitations. Homogeneity of displays, which is a prime requirement for illuminated signs, is not accomplished. A standard deviation of 3.12 lux is observed between the illuminance values on the surface of the display. In order to distribute light effectively, reflective gratings are employed. Reflective gratings aid in reducing the problem but fail to eliminate it. In addition, the overall cost of signage is increased by 50% with the use of these additional components. This problem can be overcome by the use of a distributed source of light. Hence, the organic-LEDs are considered as a possible contender. In this paper, we experimentally determine the feasibility of using OLEDs for signage applications and compare their performance with inorganic LEDs. Passive matrix, small-molecule based, commercially available OLEDs is used. Design techniques for implementation of displays using organic LEDs are also discussed. It is determined that tiled displays based on organic LEDs possess better uniformity than the inorganic LED-based displays. However, the currently available OLEDs have lower light-conversion efficiency and higher costs than the conventional, inorganic LEDs. But, signage panels based on OLEDs can be made cheaper by avoiding the use of acrylic sheet and reflective gratings. Moreover, the distributed light output and light weight of OLEDs and the potential to be built inexpensively on flexible substrates can make OLEDs more beneficial for future signage applications than the inorganic LEDs.
机译：高亮度的无机发光二极管（LED）已成功用于大型显示​​器的边缘照明。小分子和聚合物基有机发光二极管（OLED）的出现激发了人们对固态照明技术的进一步兴趣。在本文中，基于电气和光度学测量对基于边缘照明的无机LED显示器和基于OLED的最新显示器进行了评估。根据工业用途，标牌系统的参考尺寸假定为600 mm x 600mm。利用大功率发光二极管，可以开发标准尺寸的边缘照明标牌系统。这些显示器的功效为18 lm / W。尽管这些显示器既环保又高效，但是它们也受到一些固有的限制。显示器的均质性是照明标志的主要要求，但尚未实现。在显示屏表面的照度值之间观察到3.12 lux的标准偏差。为了有效地分配光，采用了反射光栅。反射光栅有助于减少问题，但不能消除。此外，使用这些附加组件会使标牌的总成本增加50％。通过使用分布式光源可以克服这个问题。因此，有机LED被认为是可能的竞争者。在本文中，我们通过实验确定了将OLED用于标牌应用的可行性，并将其性能与无机LED进行比较。使用基于无源基质，小分子的市售OLED。还讨论了使用有机LED实现显示器的设计技术。已确定基于有机LED的平铺显示器比基于无机LED的显示器具有更好的均匀性。然而，与常规的无机LED相比，当前可用的OLED具有较低的光转换效率和较高的成本。但是，通过避免使用丙烯酸板和反射光栅，可以使基于OLED的标牌面板更便宜。此外，OLED的分布式光输出和重量轻以及在柔性基板上廉价构建的潜力使OLED比无机LED更有利于未来的标牌应用。

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