34‐1: <i>Invited Paper:</i> Future AR‐HUD System

Han, Younghoon; Yang, Heajin; Yoon, Chanyoung; Kim, Byungjo; Oh, Jaeho

doi:10.1002/sdtp.16598

Cited by 1 publication

(4 citation statements)

References 5 publications

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“…Automotive head-up displays (HUDs) project driving information to the driver through the windshield or an external combiner (preferably the windshield) to improve driving safety and comfort. [1][2][3][4] Figure 1A shows the widely used freeform mirror architecture of conventional HUDs, in which a display panel creates a fixed virtual image distance (VID) following the fundamentals of geometric optics. However, the benefits of conventional HUDs are limited since they only have a single focal plane with a typical VID of 2.5 m. [5][6][7][8] The fixed VID cannot adapt to varying road environments, which may cause visual fatigue, slower reactions, and so forth.…”

Section: Introductionmentioning

confidence: 99%

“…This elicits a crucial requirement of next-generation AR-HUDs: continuously varifocal. 4 Varifocal displays can be implemented computationally or physically. The former approach includes light field display and digital holography [15][16][17][18][19][20][21] ; however, utilizing them for commercially competitive HUDs is challenging, though they have been widely studied for head-mounted displays.…”

Section: Introductionmentioning

confidence: 99%

“…Automotive head‐up displays (HUDs) project driving information to the driver through the windshield or an external combiner (preferably the windshield) to improve driving safety and comfort 1–4 . Figure 1A shows the widely used freeform mirror architecture of conventional HUDs, in which a display panel creates a fixed virtual image distance (VID) following the fundamentals of geometric optics.…”

Section: Introductionmentioning

confidence: 99%

“…However, focal planes with only two or several discrete VIDs cannot provide a seamless interaction experience with diverse road environments. This elicits a crucial requirement of next‐generation AR‐HUDs: continuously varifocal 4 . Varifocal displays can be implemented computationally or physically.…”

Section: Introductionmentioning

confidence: 99%

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A varifocal augmented reality head‐up display using Alvarez freeform lenses

Liu,

Qiu,

Dong

et al. 2024

J Soc Info Display

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A crucial requirement of augmented reality head‐up displays (AR‐HUDs) is continuously adjustable virtual image distance (VID), which allows adaptation to various depths in road environments and thereby avoids visual fatigue. However, usual varifocal components for near‐eye displays are unavailable because AR‐HUDs require the varifocal component's aperture to be larger than 10 cm. This study considers the Alvarez lenses, which change the optical power by in‐plane sliding two freeform lenses. Under the paraxial assumption, classic Alvarez lenses can create a quadratic wavefront profile, but the large aperture and extensive diopter variation range required by AR‐HUDs lead to significant aberrations. Thus, the classic paraxial Alvarez lens design is extended by co‐optimizing Alvarez lenses with high‐order surface profiles and a primary freeform mirror. Therefore, a novel varifocal AR‐HUD containing Alvarez lenses with apertures larger than 15 cm is proposed. The AR‐HUD generates a varifocal plane whose VID can be continuously adjusted between 2.5 and 7.5 m, and another focal plane with a fixed VID at 7.5 m. In addition, merely one display panel is used for compactness. Finally, an AR‐HUD prototype with a reduced volume of 9.8 L was built. The expected varifocal performance and qualified imaging quality were experimentally verified through the field of view, VID, and image sharpness.

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