51‐3: A Multi‐plane Optical See‐through Head Mounted Display with Reverse Mode PSLC

Liu, Shuxin; Li, Yan; Zhou, Pengcheng; Huang, Shuaijia; Chen, Quanming; Su, Yikai

doi:10.1002/sdtp.11739

Cited by 11 publications

(6 citation statements)

References 15 publications

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“…This variation can be performed by switching a stack of PSLC (Polymer Switchable Liquid Crystal), on which the image will be displayed. This principle is described on document [4] for a head mounted device.…”

Section: Multiplane Light Fieldmentioning

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 Light Fieldmentioning

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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show abstract

“…Thus, the power consumption of the reverse mode is ~1/(N-1) of that in the normal mode PSLC system. [27] To realize the AR display using reverse mode PSLC films, we used vertically aligned cells filled with a mixture of a negative LC (HNG715611-000), a monomer (RM257), and a small fraction of photo initiator. The curing conditions are set the same as the normal mode PSLC films.…”

Section: Ar Display Based On Reverse Mode Pslc Shuttersmentioning

confidence: 99%

27.2: Invited Paper: True 3D displays for AR applications

Liu

Zhou

et al. 2018

Symp Digest of Tech Papers

Self Cite

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Augmented reality (AR) technology, which integrates virtual computer‐generated information into the real world scene, is believed to be the next‐generation human‐machine interface. However, most AR products adopt stereoscopic 3D display technique, which causes the accommodation‐vergence conflict. To solve this problem, we have proposed two approaches. The first is a multi‐planar volumetric display using fast switching polymer‐stabilized liquid crystal (PSLC) films. By rapidly switching the films between scattering and transparent states while synchronizing with a high‐speed projector, the 2D slices of a 3D volume could be displayed in time sequence. We delved into the research on developing high‐performance PSLC films in both normal mode and reverse mode; moreover, we also realized the demonstration of four‐depth AR images with correct accommodation cues. For the second approach, we realized a holographic AR display using digital blazed gratings and a 4f system to eliminate zero‐order and higher‐order noise. With a 4k liquid crystal on silicon device, we achieved a field of view (FOV) of 32 deg. Moreover, we designed a compact waveguide‐based holographic 3D display. In the design, there are two holographic optical elements (HOEs), each of which functions as a diffractive grating and a Fresnel lens. Because of the grating effect, holographic 3D image light is coupled into and decoupled out of the waveguide by modifying incident angles. Because of the lens effect, the collimated zero order light is focused at a point, and got filtered out. The optical power of the second HOE also helps enlarge FOV.

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“…The structure of the HUD with one PGU and one combiner is relatively compact, but the use of free-form surface mirror increases the difficulty of system design and processing [15]. Using dynamic varifocal components, such as liquid lenses [9], Pancharatnam-Berry lenses [10], and multilayer polymer switchable liquid crystals [11], is another potential solution for AR HUD, which has been discussed a lot in AR near-eye display [12]. However, compared with the near-eye display, due to the need for a larger eye-box (EB), the size of the optical components in the HUD is much larger.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Plane Augmented Reality Head-Up Display System Based on Volume Holographic Optical Elements With Large Area

Liu

2021

IEEE Photonics J.

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The traditional head-up display (HUD) system has the disadvantages of a small area and a single display plane, here we propose and design an augmented reality (AR) HUD system with multi-plane, large area, high diffraction efficiency and a single picture generation unit (PGU) based on holographic optical elements (HOEs). Since volume HOEs have excellent angle selectivity and wavelength selectivity, HOEs of different wavelengths can be designed to display images in different planes. Experimental and simulated results verify the feasibility of this method. Experimental results show that the diffraction efficiencies of the red, green and blue HOEs are 75.2%, 73.1% and 67.5%. And the size of HOEs is 20cm×15cm. Moreover, the three HOEs of red, green and blue display images at different depths of 150cm, 500cm and 1000cm, respectively. In addition, the field of view (FOV) and eye-box (EB) of the system are 12°×10°a nd 9.5cm×11.2cm. Furthermore, the light transmittance of the system has reached 60%. It is believed that this technique can be applied to the augmented reality navigation display of vehicles and aviation.

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51‐3: A Multi‐plane Optical See‐through Head Mounted Display with Reverse Mode PSLC

Cited by 11 publications

References 15 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

27.2: Invited Paper: True 3D displays for AR applications

A Multi-Plane Augmented Reality Head-Up Display System Based on Volume Holographic Optical Elements With Large Area

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