1.25 million fatal car accidents occurred on roads worldwide in 2017 . Human error was a major contributing factor in 94% of the crashes [2–4]. Automotive HUDs have been developed as a safer alternative to touch control infotainment systems to reduce the sight shift from the road . HUDs were first utilized in fighter aircrafts after World War II. The original HUDs emerged as an advancement to the reflector sight that were capable of projecting a reticle at the infinite . The major characteristics of aircraft HUDs were derived from the reflector sight reticle predecessor. A semi-transparent window allows the transmitted light from a real sight to be combined with a projected image that appears as a ghost image. This paper looks at the development of lidar derived holograms to support automotive head-up displays in support of improved safety.
From an paper in Optica by Jana Slirnewskaja et al.
The human eye requires a change in accommodation between the displayed image and the road even if the displayed image is in the line of sight [12,13]. The displayed virtual objects or informative signs cannot be fixated in place of the real objects . These challenges limit HUDs in producing an augmented reality experience.
The most important challenges in the implementation of HUDs to reach a real applicability in augmented reality are the multifocal display, large viewing area without compromising the field of view, the optimal position on the windscreen and minimal invasiveness in the driving behavior by accurately pointing out hazards on the road. HUDs can serve as a defensive technology to promote driver attention.
HUDs should project information within the eye box (15×15 cm) of the driver. The eye box is required to achieve minimal interference with driver assistance systems into the driving behaviour . A collimated optical system needs a predefined exit pupil . As conventional HUDs are fixed, retaining a small exit pupil is challenging . Panoramic display can enable projecting directly in the eye box of the driver.
For the complete paper on lidar derived holograms CLICK HERE.
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