Design of a uniform-illumination two-dimensional waveguide head-up display with thin plate compensator

Gu, Luo; Cheng, Dewen; Wang, Qiwei; Hou, Qichao; Wang, Shanshan; Yang, Tong; Wang, Yongtian

doi:10.1364/oe.27.012692

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…However, in waveguide displays [11,12,14,15,16,17], for output a color image from a waveguide, one grating is sufficient for all three wavelengths. A schematic diagram of a waveguide projection suitable for both HUD and HMD is shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The OE with holographic WF can be used as a beam combiner when the image is projected onto the windshield (or onto a special screen between the windshield and the driver) of a vehicle. Windshield projection systems, or HUDs were invented quite a long time ago, first for use in aviation applications and then for automobiles [10,11,12].…”

Section: Oe With Holographic Single-layer Wfmentioning

confidence: 99%

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See-through reflective optical elements with embedded wavelike films.

Smolovich¹,

Kashin²,

Chernov³

2021

JRE

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The recently proposed optical elements containing semitransparent wavelike films embedded into the transparent material are investigated. Such optical elements do not distort a wave transmitted through them. Novel optical elements can be fabricated using well-known embossing methods. Their possible applications are discussed. The optical elements containing holographic wavelike films can be used for color holography, for augmented reality wearable glasses, as a beam combiner for head-up displays. The optical elements containing diffuse wavelike films can be used as an alternative for tinted car windows, instead of mirror-glass windows in high-rise buildings, for shop-windows, for one-way privacy windows, for printing images on eyeglasses. The scheme of a waveguide display with a single-layer holographic wavelike films is analyzed. The feasibility of the proposed applications is verified by estimation of the optical elements’ parameters and computer simulation, and measurements conducted on an experimental specimen.

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Section: Discussionmentioning

confidence: 99%

Section: Oe With Holographic Single-layer Wfmentioning

confidence: 99%

See-through reflective optical elements with embedded wavelike films.

Smolovich¹,

Kashin²,

Chernov³

2021

JRE

View full text Add to dashboard Cite

show abstract

“…The structure is simple and compact, and the module is easy to prepare and expandable. The human eye tracking device is used to capture the position of the human eye, so that the reconstructed image position can be flexibly adjusted [8][9][10].…”

Section: Principle Of Color Computing Holographic Hud Eyebox Expansio...mentioning

confidence: 99%

Color holographic HUD with eyebox expansion using a folding optical path module

Pang¹,

Yumeng²,

Chen³

et al. 2022

Holography, Diffractive Optics, and Applications XII

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Head-up displays(HUDs) are used to integrate assistance information with realistic road information to improve driving safety. The current HUDs generally present the virtual image at a near fixed distance. When the drivers' vision focus on a far distance to observe the road conditions, they need to zoom back to see the virtual image, which may causes accidents. In this paper, we designed a color holographic HUD, it can flexibly produce color image at any depth to adapt to the conditions need. Another issue of current HUD is the small eyebox caused by the limited spatial bandwidth product (SBP) of spatial light modulator (SLM). To expand the eyebox, a folding optical path module consisting of trans-reflective mirrors and reflective mirrors is designed. The folding optical path module has two functions. Firstly, it duplicates wavefront Liquid crystal on silicon(LCOS) into two sub-wavefront path to expand the eyebox by two times. Secondly, it makes it possible to observe a clear virtual image of the same depth by controlling the optical path. The feasibility of this system was demonstrated through experiments.

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“…Some applications highly require uniform critical dimensions of nanostructures such as nanogratings applied in astronomy 9 , precision measurements 10 , or laser applications 11 , of which nonuniform feature sizes are regarded as defects or aberrations, deteriorating the device performance. But some devices heavily rely on nanostructures with spatially varying feature sizes, such as structural color paintings 12,13 , metalenses [14][15][16] , and diffractive waveguides 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Spatial modulation of nanopattern dimensions by combining interference lithography and grayscale-patterned secondary exposure

Gan

Chen

et al. 2022

Light Sci Appl

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Functional nanostructures are exploited for a variety of cutting-edge fields including plasmonics, metasurfaces, and biosensors, just to name a few. Some applications require nanostructures with uniform feature sizes while others rely on spatially varying morphologies. However, fine manipulation of the feature size over a large area remains a substantial challenge because mainstream approaches to precise nanopatterning are based on low-throughput pixel-by-pixel processing, such as those utilizing focused beams of photons, electrons, or ions. In this work, we provide a solution toward wafer-scale, arbitrary modulation of feature size distribution by introducing a lithographic portfolio combining interference lithography (IL) and grayscale-patterned secondary exposure (SE). Employed after the high-throughput IL, a SE with patterned intensity distribution spatially modulates the dimensions of photoresist nanostructures. Based on this approach, we successfully fabricated 4-inch wafer-scale nanogratings with uniform linewidths of <5% variation, using grayscale-patterned SE to compensate for the linewidth difference caused by the Gaussian distribution of the laser beams in the IL. Besides, we also demonstrated a wafer-scale structural color painting by spatially modulating the filling ratio to achieve gradient grayscale color using SE.

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Design of a uniform-illumination two-dimensional waveguide head-up display with thin plate compensator

Cited by 12 publications

References 18 publications

See-through reflective optical elements with embedded wavelike films.

See-through reflective optical elements with embedded wavelike films.

Color holographic HUD with eyebox expansion using a folding optical path module

Spatial modulation of nanopattern dimensions by combining interference lithography and grayscale-patterned secondary exposure

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