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학술지 Numerical Analysis on a Viewing Angle Enhancement of a Digital Hologram by Attaching a Pixelated Random Phase Mask
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최우영, 이창주, 김범수, 오관정, 홍기훈, 추현곤, 박지선, 이승열
Applied Optics, v.60 no.4, pp.A54-A61
Optical Society of America (OSA)
19MB1200, 모바일 완전입체 단말 및 콘텐츠 기술 개발, 황치선
In a digital hologram, the maximum viewing angle of a computer-generated hologram (CGH) is limited by pixel pitch due to the diffraction grating equation. Since reducing pixel size of display panel is challenging and costly, we propose a method to expand the viewing angle of a digital hologram by attaching an aligned pixelated random phase mask (PRPM) onto the CGH pattern based on analysis of simulation results. By introducing a phase-averaging process to the widely used iterative Fourier transform algorithm, an optimized CGH pattern can be obtained in conjunction with a PRPM. Based on scalar diffraction theory, viewing angle enhancement characteristics were verified by comparing the perspective views of a two-plane hologram using a virtual eye model. In addition, we performed full electromagnetic simulations that included effects due to potential fabrication errors such as misalignment, thickness variation, and internal reflections and diffractions between the CGH and random mask patterns. From the simulation results, by attaching a 1.85 쨉m-sized pixel pitch PRPM to a 3.7 쨉m CGH, the viewing angle can be easily expanded almost identical to that of a CGH with 1.85 쨉m-pixel pitch.
KSP 제안 키워드
Computer generated holograms(CGH), Diffraction grating, Digital hologram, Display Panel, Eye model, Fabrication error, Iterative Fourier transform algorithm, Numerical Analysis, Phase-averaging, Pixel size, Random phase mask