Optical aberrations hinder the realization of high-quality near-eye displays. The imperfection of the optical components and the human eye causes image quality degradation. This invited paper introduces two recent works on aberration correction methods in holographic displays. The wave optics-based computer-generated hologram calculation method to correct the optical aberration from the eyepiece of the near-eye display is presented. In addition, the ray tracing-based vision-correcting holographic display for correcting the ocular aberration of the human eye is demonstrated.
Space-bandwidth product in digital holography is defined as a product of spatial dimension and bandwidth of the sampled space. This limitation results in a narrow field of view or a small eye-box in holographic near-eye display. Utilizing additional micro-structured or non-periodic optics is a well-known approach that bypasses this physical constraint. However, these approaches require precise alignment and suffer from low signal-to-noise ratio in the reconstructed holographic image. In this work, we propose a novel prototype of holographic near-eye display with wide field of view achieved by axially overlapped holographic projection. The feasibility of the proposed work is evaluated with simulation and experimental results
Holographic display is widely known for aberration correction capability. In this paper, we analyze the image quality degradation when aberration is present in the holographic display system. Though built with lenses with minimal aberrations, it is inevitable from undesirable error when perceived with an usual eye. Thus, we mainly analyze holographic image quality in two cases: when eye gets defocused and rotated. In simulation, accommodation-dependent schematic eye model is utilized for precise acquisition of aberration-corrected hologram. The hologram acquired with ray tracing is assessed with the bench-top prototype of holographic near-eye display.
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