• Journal of the Optical Society of Korea
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• 제15권4호
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• pp.345-351
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• 2011

We present a novel approach to the holographic three-dimensional display using a liquid crystal shutter for binocular display applications. One of the difficult problems in implementing a binocular holographic three-dimensional display is the extremely narrow viewing angle. This problem is attributed to the spatial light modulator pixel number which restricts the maximum spatial bandwidth of the spatial light modulator. In our proposed method, a beam splitter and liquid crystal shutter are used to present two holograms of a three-dimensional scene to the corresponding eyes. The combination of holographic display and liquid crystal shutter can overcome the problem of the extremely narrow viewing angle, presenting threedimensional images to both eyes with correct accommodation depth cues.

• 한국광학회:학술대회논문집
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• 한국광학회 2008년도 하계학술발표회 논문집
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• pp.119-120
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• 2008

A HMD type multi-focus 3D display system is developed and proof about satisfaction of eye accommodation is tested. Four LEDs(Light Emitting Diode) and a DMD are used to generate four parallax images at single eye and any mechanical part is not included in this system. The multi-focus means the ability of monocular depth cue to various depth levels. By achieving multi-focus function, we developed a 3D display system for only one eye, which can satisfy the accommodation to displayed virtual objects within defined depth. We could achieve a result that focus adjustment is possible at 5 step depths in sequence within 2m depth for only one eye. Additionally, the change level of burring depending on the focusing depth is tested by captured photos and moving pictures of video camera and several subjects. And the HMD type multi-focus 3D display can be applied to a monocular 3D display and monocular AR 3D display.

• 방송공학회논문지
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• 제27권4호
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• pp.569-580
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• 2022

본 연구는 입체 영상을 시청할 때 시각적 불편감 중 하나로 언급되는 양안융합 실패를 인간의 삼차원 지각 시스템 관점에서 해결하기 위하여 주변 시야의 상 흐림이 양안융합에 미치는 영향을 검증하였다. 단속적 양안 시차 변화를 가지는 자극을 제시할 때 주변 시야의 상 흐림이 제시되는 경우 교차 및 비교차 시차를 가지는 표적자극에 대한 양안융합 실패율이 감소하였다. 또한 연속적 양안 시차 변화를 가지는 자극 역시 주변시야의 상 흐림이 제시되지 않을 때에 비하여 상 흐림이 제시되는 경우에 비교차시차를 가지는 표적자극 중 양안융합 실패를 유발하는 데에 상대적으로 더 큰 양안 시차가 요구되었다. 이와 같은 결과는 주변시야 상 흐림이 양안 시차 변화상황에서 양안융합을 촉진함을 의미하며, 인간의 3차원 시각 시스템의 특성을 고려하여 자극을 조작하는 것이 낮은 비용으로 양안식 디스플레이가 유발하는 시각적 불편감을 개선할 수 있음을 시사한다.

• Current Optics and Photonics
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• 제5권1호
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• pp.23-31
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• 2021

We propose a wheel screen type Lamina 3D display, which realizes a 3D image that can satisfy the accommodation cue by projecting volumetric images encoded by varying polarization states to a multilayered screen. The proposed system is composed of two parts: an encoding part that converts depth information to states of polarization and a decoding part that projects depth images to the corresponded diffusing layer. Though the basic principle of Lamina displays has already been verified by previous studies, those schemes suffered from a bottleneck of inferior resolution of the 3D image due to the blurring on the surfaces of diffusing layers in the stacked volume. In this paper, we propose a new structure to implement the decoding part by adopting a form of the wheel screen. Experimental verification is also provided to support the proposed principle.

• Current Optics and Photonics
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• 제5권1호
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• pp.32-39
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• 2021

We propose a three-dimensional (3D) streaming system based on a lamina display that can convey field information in real-time by creating floating 3D images that can satisfy the accommodation cue. The proposed system is mainly composed of three parts, namely: a 3D vision camera unit to obtain and provide RGB and depth data in real-time, a 3D image engine unit to realize the 3D volume with a fast response time by using the RGB and depth data, and an optical floating unit to bring the implemented 3D image out of the system and consequently increase the sense of presence. Furthermore, we devise the streaming method required for implementing augmented reality (AR) images by using a multilayered image, and the proposed method for implementing AR 3D video in real-time non-face-to-face communication has been experimentally verified.