Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Analysis of Quality Improvement of a Floating Image Using a Hybrid Retroreflective Mirror Array Sheet

혼성-병풍형 구조의 재귀반사 거울 배열판을 이용한 부양영상 개선 분석

  • Yu, Dong Il (LED Smart Technology Advanced Research (LED-STAR) Center, Department of Information and Communication Engineering, Inha University) ;
  • Baek, Young Jae (LED Smart Technology Advanced Research (LED-STAR) Center, Department of Information and Communication Engineering, Inha University) ;
  • Yong, Hyeon Joong (LED Smart Technology Advanced Research (LED-STAR) Center, Department of Information and Communication Engineering, Inha University) ;
  • O, Beom Hoan (LED Smart Technology Advanced Research (LED-STAR) Center, Department of Information and Communication Engineering, Inha University)
  • 유동일 (인하대학교 정보통신공학과, 고성능 LED 조명모듈 핵심기술 연구센터) ;
  • 백영재 (인하대학교 정보통신공학과, 고성능 LED 조명모듈 핵심기술 연구센터) ;
  • 용현중 (인하대학교 정보통신공학과, 고성능 LED 조명모듈 핵심기술 연구센터) ;
  • 오범환 (인하대학교 정보통신공학과, 고성능 LED 조명모듈 핵심기술 연구센터)
  • Received : 2019.05.29
  • Accepted : 2019.06.28
  • Published : 2019.08.25
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Abstract

Normally, a corner cube retroreflector (CCRR) sheet is used as a retroreflective mirror array (RRMA) in a volumetric display. Each CCRR unit reflects light in the retroreflective direction, which is parallel to the incident light, and it makes a blurred image, as it shifts the position of light within its dimensions. Adopting a "curved planar wall" and "parabolic focusing" (x-axis), a hybrid-t(transverse direction)-RRMA is proposed, to improve the image quality and brightness. The improvement of image contrast is achieved by tuning a "linear v-shaped groove" structure to a "parabolic v-shaped groove". Also, the system has been simplified and the brightness enhanced 4 times by removing the half mirror.

일반적으로 체적형 방식의 디스플레이에는 큐브-모서리 재귀반사(corner cube retroreflector, CCRR)시트와 반투과 거울판이 사용되며, 이는 광원의 빛을 재귀반사시켜 부양영상(floating image)을 만든다. 이러한 기존 CCRR 방식은 광원의 강도를 1/4로 줄이는 반투막 투과 2회의 광손실과 각 단위 CCRR 크기에 의한 영상의 퍼짐 현상이 있다. 본 연구진이 제안하는 '혼성-병풍형' 구조 재귀반사(hybrid-t(transverse directional)-RRMA)는 광퍼짐을 최소화하여 부양영상의 품질을 향상시킬 뿐만 아니라, 광도를 4배로 높이며, 제작상의 편리함도 제공한다. '선형 v자 홈' (linear v-shaped groove)을 '포물선 v자 홈' (parabolic v-shaped groove)모양으로 조절한 재귀반사로 영상의 퍼짐을 개선하여 부양영상을 최적화하였고, '평면(flat wall) 재귀반사' 대신 '곡면(curved planar wall)-재귀반사' 구조를 적용한 '곡면-병풍형-재귀반사판'을 사용하여 반투과 거울판을 없애 반투막에 의한 광손실을 개선하고, 시스템을 단순화하였다.

Keywords

KGHHBU_2019_v30n4_142_f0001.png 이미지

Fig. 1. Comparison of typical CCRR & proposed t-RRMA. (a) Setup and image quality of typical CCRR with half mirror. (b) Setup and image quality of the proposed t-RRMA.

KGHHBU_2019_v30n4_142_f0002.png 이미지

Fig. 2. Schematic shapes of various t-RRMA’s. (a) Top view of t-RRMA walls and the v-grooves of two t-rr shapes; linear v (left) & parabolic v (right). (b) Front view of typical t-RRMA’s. (c) Side views of flat-t-rr (left) & curved-t-rr (right).

KGHHBU_2019_v30n4_142_f0003.png 이미지

Fig. 3. Simulation result & analysis on t-RRMA’s.

References

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