Design and fabrication of an off-axis four-mirror system for head-up displays
| Autor: | Dewen Cheng, Junhao Ni, Yongtian Wang, Yue Liu, Luo Gu, Tong Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Geometrical optics
business.industry Image quality Computer science 01 natural sciences Eye relief Atomic and Molecular Physics and Optics law.invention 010309 optics Optics law 0103 physical sciences Computer vision Augmented reality Artificial intelligence Electrical and Electronic Engineering business Parallax Divergence (statistics) Engineering (miscellaneous) |
| Zdroj: | Applied optics. 59(16) |
| ISSN: | 1539-4522 |
| Popis: | Head-up displays (HUDs), as one kind of the augmented reality (AR) applications, enable users to enhance the situational awareness. In this paper, we propose a design of a HUD employing the freeform off-axis four-mirror construction, in which the eyebox and eye relief as large as 120 m m × 80 m m and 400 mm, respectively, are derived. In the part of system design, the biocular parallax is evaluated and corrected. An optimization strategy in forward ray-tracing mode is presented to directly govern the biocular parallax, and the convergence, divergence, and dipvergence are finally constrained within 3.5 mrad, 1.5 mrad, and 2.0 mrad, respectively. An overall design procedure of a HUD, including initial configuration, structure constraints, optimization method, and parallax correction, is illustrated in detail. After analyzing the tolerance, a proof-of-concept prototype with the field of 24 ∘ × 15 ∘ is developed to demonstrate the image quality. |
| Databáze: | OpenAIRE |
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