Design of a Low Distortion Head-Mounted Display with Freeform Reflective Mirror Based on Two Ellipsoids Structure

Wang, Junhua; Liang, Yuechao; Xu, Min

doi:10.3807/josk.2016.20.2.234

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…To obtain an initial freeform surface profile, a set of partial differential equations need to be solved once the mapping between image space and object space was built, and then further optimization was implemented. A geometric shape, referred to as ellipsoid structure, could be used as freeform surface representation [5]. However, distortion is unavoidable because there is an extremely wide-angle lens.…”

Section: Introductionmentioning

confidence: 99%

Realizing low-distortion in wide-angle lens with freeform optics technique

Zhuang

Parent

Roulet

et al. 2022

Current Developments in Lens Design and Optical Engineering XXIII

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Distortion is one major shortcoming of conventional wide-angle lens. The correction of distortion can maximize field of view in a wide-angle lens and benefit natural scenes. In this paper, we propose a compact wide-angle lens utilizing freeform surfaces to address the shortcoming. The design approaches, including the starting point selection, freeform surface conversion scheme, and system optimization, are discussed in detail. Moreover, freeform diagnostic tools are developed aiming to facilitate system optimization and visualize the critical aspects of optical performance. The simulation results are demonstrated and discussed. Analysis results demonstrate that the design strategies proposed in this paper have been shown to be effective in reducing distortion as well as improving optical performance. We envision that the proposed design schemes will have a positive effect on research and application values for wide angle lens system.

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Section: Introductionmentioning

confidence: 99%

Realizing low-distortion in wide-angle lens with freeform optics technique

Zhuang

Parent

Roulet

et al. 2022

Current Developments in Lens Design and Optical Engineering XXIII

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show abstract

“…To offset the distortion of an HMD by optimizing the optical system can be effective in some specific cases. 18,19 However, for some optical systems, such as the freeformsurface-prism (FFSP) system, the nonlinear distortion cannot be completely corrected by itself. 17 A more generally applicable approach is the computational correction based on a predistortion technique.…”

Section: Introductionmentioning

confidence: 99%

Division model‐based distortion correction method for head‐mounted displays

et al. 2019

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In this paper, we present a simple and efficient method for correcting the asymmetric and nonlinear geometrical distortion of a head‐mounted display (HMD). The method divides the object space into a number of quadratic triangular elements and applies a quadratic predistortion for each image section so that it can handle the distortion with any complex shapes caused by the decentering and tilted optics and improve the calibration accuracy. The errors introduced in the process of fabricating and assembling can also be eliminated. We investigated the use of a quadratic division model and two types of linear division models on an off‐axis HMD to correct the optical distortion. Experimental results demonstrated that the quadratic division model converged at a faster rate and produced higher accuracy over the typical linear model. The average root of mean square error (RMSE) after distortion correction was one pixel, and the maximum standard deviations in all rows and columns were 0.67 pixel and 0.57 pixel. In addition, the deformation continuity is maintained by using the quadratic element with connected midside nodes.

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“…Depending on their purpose, HMDs are divided into displays with military and civilian applications. In general, the different types of designs may be divided into four classifications; Pupil and non-pupil, refractive and cat dioptric, inside vision, and finally on-axial and off-axial [2][3][4]. In this article we focused on designing the pupil type (by which all emitted beams are transmitted through an aperture called the "exit pupil").…”

Section: Introductionmentioning

confidence: 99%

Design of Diffraction Limited Head Mounted Display Optical System Based on High Efficiency Diffractive Elements

Tehrani

Fard

2017

Current Optics and Photonics

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A diffraction limited optical system for head mounted displays (HMDs) was designed. This optical system consists of four modules, including 1:5 mm and 5:30 mm beam expanders, polarization gratingpolarization conversion system (PG-PCS) and refractive/diffractive projection optical module. The PG-PCS module transforms the unpolarized Gaussian beam to a linearly polarized beam and it simultaneously homogenizes the spatial intensity profile. The optical projector module has a 30° field of view, a 22 mm eye relief, and a 10 mm exit pupil diameter with a compact structure. Common acrylic materials were utilized in the optical design process; therefore, the final optical system was lightweight. The whole optical system is suitable for a 0.7 inch liquid crystal on silicon microdisplay (LCOS) with HDTV resolution (1920×1080) and 8.0 µm pixel pitch.

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Design of a Low Distortion Head-Mounted Display with Freeform Reflective Mirror Based on Two Ellipsoids Structure

Cited by 3 publications

References 8 publications

Realizing low-distortion in wide-angle lens with freeform optics technique

Realizing low-distortion in wide-angle lens with freeform optics technique

Division model‐based distortion correction method for head‐mounted displays

Design of Diffraction Limited Head Mounted Display Optical System Based on High Efficiency Diffractive Elements

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