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Hella partned with Covestro to develop the latest automotive tail light with 3d holographic effects


World-famous lighting leading player HELLA has worked with Covestro, one of the worlds largest polymer manufacturers, to develop a latest holographic rear-lighting system with 3D effects for passenger vehicles.


In a recent demonstration in Germany, visitors could see that  front lighting featured a seamless, continuous light strip running across the entire front of the vehicle.


HELLA and Covestro have worked together since 2012, accumulating their knowledge of electronics, lighting and plastics technologies to develop innovative designs for automotive front and rear lights.


The unique rear light system for automotive is based on a lamp with three parts, each equipped with holographic technology. Designers at HELLA developed each hologram. Covestro then turned the designs into a transparent holographic film and laminated the film onto a 3 mm glass plate. In the future, mass production would use plastic instead of glass. Holographic films are much suitable for integrating different lighting functions into the body of a car in space-saving, reserved ways. The installation depth can be reduced and automotive manufacturers can install lamps that are more compact in size."


To create a 3D effect, the holographic film is lighted from behind by LED light sources and reflectors. The outer elements of each lamp feature numerous holographic "flakes." Integrated into the tailgate is a middle lamp on which the HELLA and Covestro logos appear to be floating.


Instead of a high mounted stop lamp, the rear stop lamp and center high mount stop lamp are combined into a unique single unit that sweeps across the entire back of the vehicle.


People can see the tail lights are combined with the direction indicators, or turn signals, using a diffuser film with diffractive optics developed by Covestro. The diffuser film forms and distributes uniform light beams with a minimal loss of light. Bi-colored LEDs generate rear turn signals and tail-light functions. Sequential turn signals are also possible with the LED light system on a vehicle.


HELLA and Covestro created seamless, uniform front-surface signal lighting for the vehicle as well. Signal functions are generated by a three-part EdgeLight light guide that covers the entire front of the vehicle as a continuous strip of light. The two outer parts of the light guide create the direction-indicator lights, as well as daytime running lights (DRLs), which also can be dimmed to position lighting. The middle light guide is responsible for the continuous daytime running lights and a position light signature.


The area in front of the vehicle is lighted using four ComLED modules. The very important functions of low beam and high beam lights are executed by the matrix HD84 module developed by HELLA.


LED displays are integrated into both the front and back of the vehicle to enable additional animation, such as a welcome light function. In the future, additional safety or convenience displays could be created to improve the driving experience. For example when braking, it might be possible to turn on the rear lamp with a message such as "STOP."

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