Modal control refractive Fresnel lens with uniform liquid crystal layer

Sova, Oleksandr; Galstian, Tigran

doi:10.1016/j.optcom.2020.126056

Cited by 19 publications

(5 citation statements)

References 28 publications

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“…The ability to focus at different depths within the replay field results and layer various objects at different distances was created by a virtual Fresnel lens based on the Fresnel diffraction theory. [ 111 ] The holograms are computationally created, and are layered at different distances within the observer's replay field from near‐eye and extending to the far field. [ 112 ] Positive lenses could be utilized as Fourier transformers for phase transformation.…”

Section: Holographic Hudsmentioning

confidence: 99%

Automotive Holographic Head‐Up Displays

Skirnewskaja

Wilkinson

2022

Advanced Materials

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Driver's access to information about navigation and vehicle data through in‐car displays and personal devices distract the driver from safe vehicle management. The discrepancy between road safety and infotainment must be addressed to develop safely operated modern vehicles. Head‐up displays (HUDs) aim to introduce a seamless uptake of visual information for the driver while securely operating a vehicle. HUDs projected on the windshield provide the driver with visual navigation and vehicle data within the comfort of the driver's personal eye box through a customizable extended display space. Windshield HUDs do not require the driver to shift the gaze away from the road to attain road information. This article presents a review of technological advances and future perspectives in holographic HUDs by analyzing the optoelectronics devices and the user experience of the driver. The review elucidates holographic displays and full augmented reality in 3D with depth perception when projecting the visual information on the road within the driver's gaze. Design factors, functionality, and the integration of personalized machine learning technologies into holographic HUDs are discussed. Application examples of the display technologies regarding road safety and security are presented. An outlook is provided to reflect on display trends and autonomous driving.

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Section: Holographic Hudsmentioning

confidence: 99%

Automotive Holographic Head‐Up Displays

Skirnewskaja

Wilkinson

2022

Advanced Materials

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“…To reduce the limitation of the switching speed of the large aperture LC lenses, many approaches have been reported recently 30 , 36 – 45 Among these approaches, the concentric ring electrode-based segmented phase profile (SPP) LC lens is continuously tunable, has a simple design, and maintains a parabolic phase profile within a large area 30 , 36 . In this design, the area of the segmented phase regions (SPRs) remains the same; as a result, the width of SPR changes in parabolic fashion.…”

Section: Introductionmentioning

confidence: 99%

Haze reduction in concentric electrode-based large aperture liquid crystal lens with segmented phase profile

et al. 2023

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.In the field of augmented reality/virtual reality head-mounted displays or eyeglasses, electro-optical tunable lenses have great potential to resolve the issue of accommodation-convergence conflicts and to correct vision problems. A high-quality tunable lens with a large field of view is highly desired for these near-to-eye applications. Recently, gradient refractive index tunable liquid crystal lenses with a concentric ring electrode design and segmented phase profile have received attention due to their compactness, low-voltage requirement, and ability to provide a large aperture size while maintaining a fast-switching speed. However, this design can result in degradation of optical quality, causing haze from the phase reset boundaries and electrode discontinuity. We analyze the cause of haze and presents solutions to reduce these effects, and we experimentally validate them.

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“…Similar manufacturing problems persist for another very interesting approach (based on the refractive Fresnel concept) requiring multiple levels of high precision lithography [ 14 , 15 ]. Other, promising approaches were reported as well, such as the so-called geometric-phase [ 16 , 17 ], refractive Fresnel [ 18 ] or Foveal type of TLCLs [ 19 ], which have good chances for mid-term applications in augmented reality and virtual reality devices (see also, [ 17 , 20 ]). However, the non-standard manufacturing requirements in most of these designs remain as serious problems yet to be resolved.…”

Section: Introductionmentioning

confidence: 99%

Large diameter electrically tunable lens for ophthalmic distance accommodation

Sova,

Presniakov,

Zohrabyan

et al. 2023

Biomed. Opt. Express

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Electrically tunable liquid crystal lens with 30 mm diameter is presented based on the refractive Fresnel concept. Relatively large optical power variation range (from – 0.74 to +0.71 Diopters) is demonstrated along with very low root mean square aberrations (≤0.15 µm). Optical characterizations, including with Snellen chart, show that good vision recovery may be obtained with fast response time (under 500 msec) and relatively low haze. The proposed design is very simple and may be fabricated by using single step lithography. Perspectives on its applications are discussed.

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Modal control refractive Fresnel lens with uniform liquid crystal layer

Cited by 19 publications

References 28 publications

Automotive Holographic Head‐Up Displays

Automotive Holographic Head‐Up Displays

Haze reduction in concentric electrode-based large aperture liquid crystal lens with segmented phase profile

Large diameter electrically tunable lens for ophthalmic distance accommodation

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