Design of an immersive head mounted display with coaxial catadioptric optics

Gu, Luo; Cheng, Dewen; Wang, Yongtian

doi:10.1117/12.2315687

Cited by 7 publications

(4 citation statements)

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“…However, in the 2020s, various VR/augmented reality (AR) display technologies have been introduced to reduce the thickness of optical modules, including catadioptric lenses and polarization-based reflective-folded lenses. For example, Panasonic VR Glass and HTC FLOW have thicknesses of approximately 30 mm with catadioptric lenses [11] and polarized-based reflective folded lenses [12,13]. Some systems, such as the ThinVR system proposed by Ratcliff and others [14], have implemented curved 2D compound lens arrays with an approximate thickness of 20 mm.…”

Section: Related Workmentioning

confidence: 99%

Compact near‐eye display for firefighter's self‐contained breathing apparatus

Yang

2023

ETRI Journal

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We introduce a display for virtual‐reality (VR) fire training. Firefighters prefer to wear and operate a real breathing apparatus while experiencing full visual immersion in a VR fire space. Thus, we used a thin head‐mounted display (HMD) with a light field and folded optical system, aiming to both minimize the volume for integration in front of the face into a breathing apparatus and maintain adequate visibility, including a wide viewing angle and resolution similar to that of commercial displays. We developed the optical system testing modules and prototypes of the integrated breathing apparatus. Through iterative testing, the thickness of the output optical module in front of the eyes was reduced from 50 mm to 60 mm to less than 20 mm while maintaining a viewing angle of 103°. In addition, the resolution and image quality degradation of the light field in the display was mitigated. Hence, we obtained a display with a structure consistent with the needs of firefighters in the field. In future work, we will conduct user evaluation regarding fire scene reproducibility by combining immersive VR fire training and real firefighting equipment.

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Section: Related Workmentioning

confidence: 99%

Compact near‐eye display for firefighter's self‐contained breathing apparatus

Yang

2023

ETRI Journal

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“…The average human field of view is around 180° [26]. The virtual reality headset used in the study has a 105° field of view (FOV) and due to the precise positioning of the Fresnel lenses on the headset, it can take some adjustment to get it right [14]; thus the UI text is used to guide the wearer to see this in focus before tightening the head strap and can help them get the HMD on correctly. On the desktop application the UI is a HUD style element permanently displayed, though fading when the user starts to interact with the 3D scene.…”

Section: The 3d Environmentmentioning

confidence: 99%

Virtual Reality vs Pancake Environments: A Comparison of Interaction on Immersive and Traditional Screens

Holder

Carey

Keir

2020

Lecture Notes in Computer Science

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Virtual Reality environments provide an immersive experience for the user. Since humans see the real world in 3D, being placed in a virtual environment allows the brain to perceive the virtual world as a real environment. This paper examines the contrasts between two different user interfaces by presenting test subjects with the same 3D environment through a traditional flat screen (pancake) and an immersive virtual reality (VR) system. The participants (n=31) are computer literate and familiar with computer generated virtual worlds. We recorded each user's interactions while they undertook a short-supervised play session with both hardware options to gathering objective data; with a questionnaire to collect subjective data, to gain an understanding of their interaction in a virtual world. The information provided an opportunity to understand how we can influence future interface implementations used in the technology. Analysis of the data has found that people are open to using VR to explore a virtual space with some unconventional interaction abilities such as using the whole body to interact. Due to modern VR being a young platform very few best practice conventions are known in this space compared to the more established flat screen equivalent.

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“…These benefits include high resolution, wide field-of-view (FOV), compact size, light weight, adjustable focus and a potentially more accommodating eye box etc. Different formats and aspects of the catadioptric optics systems are studied thoroughly by different groups [7,8]. However one of the major challenges of such systems is to reduce the light intensities of ghost images and spurious halos due to multi-bounces, hence improving the overall image contrast.…”

Section: Introductionmentioning

confidence: 99%

Ghost analysis of a polarized catadioptric system for virtual reality

Hao

Aastuen

et al. 2023

Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) IV

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Polarized catadioptric systems (also called folded optics, pancake lenses) are a viable solution for virtual reality (VR) head-mount display applications. Reasons include its high image resolution, wide field-of-view, smaller physical size and lighter weight compared to the conventional refractive optics counterparts. One of the major challenges with folded optics systems is to reduce the light intensities of the ghost images and spurious halos due to multi-bounces, hence improve the overall image contrast. In this paper we discuss a high-quality polarized catadioptric system and present a ghost analysis method and the corresponding results. It can be shown that the many ghosts in the image plane can be coarsely categorized into "local ghosts" and "distant ghosts" according to their proximity to the image. The local ghosts or halos are close to the image itself and they directly decrease image contrast; whereas the distant ghosts are located diagonally away from the image and they can create some distracting faint images under certain display content. The origin of each individual ghost and halo can be traced back to its contributing optical components, which provides targeted information to directly mitigate them on a component level. Experimental results are shown to demonstrate the validity and efficacy of this approach. Furthermore, the ghost analysis information can also be used as additional constraints in the lens design software to perform new rounds of optimization on a system level.

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Design of an immersive head mounted display with coaxial catadioptric optics

Cited by 7 publications

References 0 publications

Compact near‐eye display for firefighter's self‐contained breathing apparatus

Compact near‐eye display for firefighter's self‐contained breathing apparatus

Virtual Reality vs Pancake Environments: A Comparison of Interaction on Immersive and Traditional Screens

Ghost analysis of a polarized catadioptric system for virtual reality

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