Page 45

EETE MAR 2017

AUTOMOTIVE ELECTRONICS Current developments and challenges in LED based vehicle lighting applications By Andreas Schimmelpfennig In addition to the US, Europe remains the most important automotive market in the world. Besides the well-known industry leaders, also new players would like to participate in this market, but often don’t show the necessary corresponding commitment. In the automotive sector, however, investment goes before market penetration. The following article addresses current challenges in the areas of indoor and outdoor lighting as well as qualification and test from the point of view of a manufacturer of optoelectronic components, especially light-emitting diodes. Interior lighting In the vehicle interior, a consolidation of the use of LED packages in favour of individual multifunctional diodes can be observed. The decreasing demand results from the increased use of TFT technology in the cluster / cockpit area, but also by RGB LEDs in the ambient lighting, which can be used to display all colours according to the customer’s requirements instead of a single LED. The main focus here is on the foot-well, but also the side parts of vehicles are equipped accordingly. For most vehicles fitted with ambient lighting, about 10 RGB LEDs per vehicle are used. Ambient lighting applications were first used in the upper-class vehicles. But now it has also become increasingly popular in mediumclass vehicles. However, in terms of the LED characteristics of ambient lighting with RGB LEDs are concerned, opinions tend to differ sharply. In general, the preferred/most wanted wavelength range of red is 620-633nm, green is 520-535nm and blue is 447-471nm. As far as the basic colours are concerned, the desired range is often limited to a maximum of +/- 4 nanometres. But for blue, there are differences: the shorter the blue wavelength, the lower the brightness. Some car manufacturers therefore value a blue over 456nm, some others request a significantly higher figure. For this reason, Everlight has launched four customer-specific RGB versions for different vehicle manufacturers which are available now. That‘s it  A huge selection  The best quality  An excellent service buerklin.com Andreas Schimmelpfennig is Director Automotive Business at Everlight Electronics Europe -www.everlight.com www.electronics-eetimes.com Electronic Engineering Times Europe March 2017 37 Electronic times_23_02_17_V01.indd 1 08.02.2017 13:40:03 Dashboard and ambient lighting


EETE MAR 2017
To see the actual publication please follow the link above