Development of a 3D HUD using a tunable bandpass filter for wavelength multiplexing

Coni, Philippe; Bardon, Jean-Luc; Gueguen, Aude; Grossetête, Matthieu

doi:10.1002/jsid.539

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Our novel idea is to use only one PGU to generate at least two colors at λ1 & λ2 and with [λ1, λ2] as small as possible (Typically 15 nm). This requires a special PGU, able to multiplex two wavelengths, for example by using a tunable bandpass filter [8] The windshield glass will be fitted with two HOEs, with the same angular selectivity (same θ), but with different optical power (At least, one of the HOE acts as a lens to magnify the image, that appears at a longer distance (Figure 7). The system needs to be designed off-axis, in order to get diffracted beam in the eye box, and Fresnel reflection out of the eye box.…”

Section: Multiplane Hud Using Spectral Selectivitymentioning

confidence: 99%

56‐1: A Multiplane Holographic HUD Using Light Selectivity of Bragg Grating

Coni

Bardon

Damamme

et al. 2019

Symp Digest of Tech Papers

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A Multi-plane Head-Up Display (MHUD) using the spectral and angular selectivity of Bragg Grating is presented. Most of today's automotive HUDs display information at a short distance, about 2 meters. However, a key challenge of augmented reality is to have a longer projection distance to superimpose graphics on the external landscape, without parallax issues, while keeping vehicle information at a shorter distance. As a result, the HUD needs to have at least two image planes. Existing methods to build such a multiplane lightfield HUD are complex and bulky. In this paper, we propose a new principle, using a dual PGU an then a single PGU, fitted with HOE working with the spectral dimension of the light.

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Section: Multiplane Hud Using Spectral Selectivitymentioning

confidence: 99%

56‐1: A Multiplane Holographic HUD Using Light Selectivity of Bragg Grating

Coni

Bardon

Damamme

et al. 2019

Symp Digest of Tech Papers

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“…The light source is adapted to the working spectrum of the THOE, with the capability to tune the wavelength [12] The following performances were measured:…”

Section: 3mentioning

confidence: 99%

55‐3: Holographic Grating to Improve the Efficiency of Windshield HUD

Coni

Bardon

Damamme

et al. 2018

Symp Digest of Tech Papers

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A Windshield Head-Up Display (WHUD) using an embedded optical thin film to improve the system efficiency is presented. Most of today's WHUDs, including the most advanced devices, use the windshield as a simple half-mirror, so that the main part of the optical flow is not reflected toward the eye-box. Even with recent work, aiming to increase the optical efficiency of the Picture Generating Unit, or the set of mirrors or light-guides, reflectance efficiency is not greater than 20%. Experiments performed on the first prototype using Transparent Holographic Optical Components show an optical efficiency of 85%. This result will open the way for a more compact green product device (with a huge reduction in power consumption). 55-3 / P. Coni SID 2018 DIGEST • 729ISSN 0097-996X/18/4702-0729-$1.00 © 2018 SID 55-3 / P. Coni

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“…Holographicoptical-elements-based HUDs have also been demonstrated to provide an asymmetric FOV [2]. On the other hand, the development of three-dimensional (3D) HUDs is usually limited to lenticular-screenbased multi-view displays [3] wavelength-division-multiplexed systems [4], and transparent-screen-based stereo 3D HUDs [5,6].…”

Section: Introductionmentioning

confidence: 99%

Visual acuity response when using the 3D head-up display in the presence of an accommodation-convergence conflict

Soomro

Ürey

2019

Journal of Information Display

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Visual discomfort and fatigue due to accommodation-convergence (AC) conflict in stereoscopic displays has been widely reported, but little is known about its impact on visual acuity, particularly when automotive three-dimensional (3D) head-up displays (HUDs) are involved. This paper presents a study on the visual acuity response when an indigenously developed 75% transparent retroreflective screen is used as a windshield 3D HUD. The simulated optical collimation technique was used to provide the virtual content at a farther depth (i.e. on the road while driving). Two user test experiments were performed. The first test was performed under the see-through condition, where the real scene (i.e. roadside view) was perceived through the 3D HUD, while the second test was performed under the simulated collimation condition, where a stereo-collimated virtual content was projected on the HUD at a farther depth. The results showed a slightly declining trend (from 20/20 to 20/25) in visual acuity response when the HUD screen was placed between the viewer and the scene. An inverse relation between the amount of AC conflict and visual acuity was observed under the simulated collimation condition. The > 100 cm user-to-screen distance was found to be comfortable, providing the highest acuity response.

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Development of a 3D HUD using a tunable bandpass filter for wavelength multiplexing

Cited by 8 publications

References 4 publications

56‐1: A Multiplane Holographic HUD Using Light Selectivity of Bragg Grating

56‐1: A Multiplane Holographic HUD Using Light Selectivity of Bragg Grating

55‐3: Holographic Grating to Improve the Efficiency of Windshield HUD

Visual acuity response when using the 3D head-up display in the presence of an accommodation-convergence conflict

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