LED-based automotive exterior displays and interior signage for autonomous cars

Karlheinz Blankenbach; Robert Isele; Daniel Ochs; Steffen Reichel

doi:10.1117/12.2543253

26 February 2020 LED-based automotive exterior displays and interior signage for autonomous cars

Karlheinz Blankenbach, Robert Isele, Daniel Ochs, Steffen Reichel

Proceedings Volume 11304, Advances in Display Technologies X; 113040U (2020) https://doi.org/10.1117/12.2543253
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

The purpose of this research is to investigate the different requirements and design parameters and thus the challenges of digital RGB LEDs for automotive interior lighting and signage. Challenges are for instance scalability and driving of a large number of LEDs. The optical performance is ruled by temperature dependencies of LEDs, production tolerances of LEDs and integration into light guides. All these and some more parameters determine at the very end the uniformity in terms of luminance and color coordinate; a potential non-uniformity should be in a range that is not perceived by observers or limited to a non-disturbing value. For this purpose, commercially available digital RGB LEDs (WS2812B) and professional automotive RGB LEDs (ISELED) were evaluated with regard to optical parameters such as spectra, uniformity and temperature dependencies. The optical measurements reveal the importance of calibration, temperature compensation and production tolerances (binning). It also shows how essential an efficient protocol for RGB data communication is for addressing a large number of LEDs without noticeable lag or sluggish animations.

Citation Download Citation

Karlheinz Blankenbach, Robert Isele, Daniel Ochs, and Steffen Reichel "LED-based automotive exterior displays and interior signage for autonomous cars", Proc. SPIE 11304, Advances in Display Technologies X, 113040U (26 February 2020); https://doi.org/10.1117/12.2543253

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