COVER STORY
These solutions use
transparent displays to show information in front of the driver. The electronics and flexible cables are compact and hidden, while the display parts are outside the dashboard. Micro-LED arrays are glued on the windscreen, the TOLED display is installed above the dashboard as a separate unit, and Lumineq in-glass displays are laminated in the windscreen. The significant
difference between an emissive HUD and a projected HUD is the focal point. The focal point of a projected HUD is adjustable, while the focal point of an emissive HUD is on the display, which is placed in the driver’s line of sight. This can arguably be a disadvantage or an advantage, depending on the driver’s preference. The projected information ‘floating’ a few metres ahead of the driver allows
Illustrating the setup of different head-up display technologies
the eyes to refocus faster, but some drivers may find it more distracting when mixed with real-world road conditions. Besides the focal point, another
big difference is the amount of space required for the setup. In this regard, emissive HUDs clearly win. Their construction is simple and requires little space in the vehicle’s interior. Instead of a complex projection system, the emissive HUDs consist only of compact electronics, a flexible cable and a display. The electronics are small and require around 0.3 litres of space from the dashboard, 20-30 times less than the projected HUDs. Furthermore,
A summary of various performance aspects
emissive HUDs handle shock and vibration
better. They work in trucks, buses, RVs and vans with vertical windscreens, because the information is shown directly on the display, unlike projected HUDs that require specific angles to project images properly. Among these three emissive HUDs,
Lumineq and mini-LED are made from inorganic materials, while TOLED is made from organic materials. Therefore, the local environment greatly affects the performance of a TOLED HUD, while the other two are immune from environmental factors including humidity, solar load and temperature. Regarding optical clarity and
transmission, the Lumineq in-glass HUD offers several advantages over TOLED and mini-LED. It is practically as clear as glass, with over 70% transparency, while TOLED has 40% and mini-LED 60%. It also has good clarity and minimal haze, while the other two have clarity and haze issues. The images from Lumineq in-glass HUD are viewable from 360° angles, both inside and outside the vehicles. When it comes to the richness of
the content, both TOLED and mini- LED can display colourful images, while Lumineq in-glass HUD is monochrome. ●
Check
www.lumineq.com for more information
www.engineerlive.com 7
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