Automotive head-up display

An automotive head-up display or automotive heads-up display — also known as an auto-HUD — is any transparent display that presents data in the automobile without requiring users to look away from their usual viewpoints. The origin of the name stems from a pilot being able to view information with the head positioned "up" and looking forward, instead of angled down looking at lower instruments. At this time, there are three different approaches to OEM HUDs in automobiles. The first is to treat the back of the windshield in such a way that an image projected onto it will reflect to the driver. The second is to have a small combiner that is separate from the windshield. Combiners can be retracted. The third is to laminate a transparent display in between layers of the windshield glass.[1]

HUD in a BMW E60
HUD in a Pontiac Bonneville showing a speed of 47 mph (76 km/h)
The green arrow on the windshield near the top of this picture is a Head Up Display on a 2013 Toyota Prius. It toggles between the GPS navigation instruction arrow and the speedometer. The arrow is animated to appear scrolling forward as the car approaches the turn. The image is projected without any kind of glass combiner.
HUD in a Mazda using a retractable combiner rather than being reflected from the windshield.
Mazda CX-9 active driving display with traffic sign recognition
  1. ^ LUMINEQ. "How is LUMINEQ transparent display laminated in glass". www.lumineq.com. Retrieved 17 March 2022.