• Proceedings of the Optical Society of Korea Conference
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• 2006.02a
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• pp.355-356
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• 2006

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.11a
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• pp.182-183
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• 2019

본 논문은 이동형 프로젝션 디스플레이 구현을 위해 드론에 빔 프모젝터를 탑재한 드론 탐재형 프로젝터 시스템을 제인한다. 드론 탑재형 프로젝터 시스템의 주된 문제점은 드론의 모터에서 발생하는 흔들림이 그대로 프로젝터에 전달되기 때문에 프로젝션 영상에 왜곡이 발생하게 된다는 것이다. 이러한 왜곡현상은 드론의 움직임에 따라 파동현상 (Fluctuation), 축 이동, 축 회전으로 구분할 수 있다. 본 논문에서는 드론 탑재형 프로젝터에서 자주 발생하는 파동현상을 초음파센서를 이용하여 안정화 하는 방법을 제안한다.

• Korean Journal of Optics and Photonics
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• v.18 no.6
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• pp.421-425
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• 2007

A new 3D rear projection display system using double-layer polarization-selective screen systems, one stacked in front of the other, has been developed. The front and rear screens are made of scattering polarizer films, and they either diffuse-scatter or transmit the incident light depending on the polarization state of the light. The near and for images are projected onto the front and rear screens, respectively, using light waves with mutually orthogonal polarization states. The new display system produces clear high-resolution images, which are visible over a wide range of viewing angle. It was found that the impression of depth is pronounced and eyestrain is only comparable to that by 2D display systems.

• Journal of Broadcast Engineering
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• v.12 no.2
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• pp.137-147
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• 2007

Projection-based augmented reality (AR) system refers to the system that accurately project high quality virtual information at the user-specified area by using the projector. Most of projection-based AR systems use the display device to support high quality and wide screen for increasing the user-immersion. Furthermore, they are implemented on the desktop environment due to the computational complexity. However, these projection-based AR systems are not suited as a mobile system and thus it may be inconvenient in the user point of view. Fortunately, Miniaturization of projectors and improved capacity of the mobile processor allowed the mobile AR system to be convenient. The limitation of established mobile AR system is that it uses small display screen which does not support high-resolutions and thus it may reduce the user-immersion into the system. In this paper, we propose portable projection-based display system, which overcomes the limitations of both projection-based and mobile-based AR systems. We have conducted the user evaluation to verify the effectiveness and the utmost capacity of the system.

• Journal of the Korea Computer Graphics Society
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• v.13 no.2
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• pp.55-60
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• 2007

Diminished reality (DR) is a technique that provide a visual convenience by virtually hiding an object. Most of existing DR systems have been implemented based on HMDs or desktop displays. However, Here has been no report on the development of DR system based on projection displays due to technical difficulty in spite of its superiority in the aspect of human factor to conventional displays. Rapid advances of projection displays and projection-based vision technologies motivated us to develop a projection-based DR system. As the first attempt, this paper proposes a projection-based diminished reality system using an image completion technique. Its usefulness is demonstrated through experiments and its potential applications are discussed.

• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.220-221
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• 2002

전달된 정보를 표시하는 다양한 디스플레이 광학기기 중 반사형 LCOS 프로젝션 시스템은 칼라의 구현을 위해 광원에서 나온 빔을 색분리계를 통해 각각 R, G, B 로 나누고, LC(Liquid Crystal)를 통해 각각의 이미지를 변조한 후 다시 합성하게 된다. 광원으로부터 입사한 백색 광선은 PBS(polarize beam splitter) array를 거쳐 s-편광파로 바뀌게 되고, 각각의 다이크로익 필터와 거울들을 거쳐 R, G, B의 3개의 채널로 분리된다. (중략)

• The Science & Technology
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• v.28 no.12 s.319
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• pp.75-79
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• 1995

'꿈의 TV'라고 하는 벽걸이 텔레비전의 양산시대가 2~3년내로 다가오고 있다. 세계 액정시장을 독점하다시피하고 있는 일본의 전자메이커들은 1997년부터 일본에서 방영되는 고선명 화질의 '하이버전' 본방송과 1998년 일본 나가노(장야)에서 열리는 동계올림픽과 때를 맞추어 두께 25mm 이하의 얄팍한 벽걸이TV를 본격적으로 출시할 계획이다. 일본 기업들은 화면의 크기에 따라 20인치 정도까지는 액정디스플레이(LCD), 20~60인치는 플라스마 디스플레이(PDP) 그리고 그 이상은 투사형 프로젝션으로 차별화하여 개발전략을 추진하고 있다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.100-100
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 2004.02a
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• pp.12-13
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• 2004

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.38 no.5
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• pp.529-537
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• 2001

According to increase of preference to the large display device, demand of a three-tube projection TV increase in the display market. But luminance per unit area of a 3-tube projection TV is less bright than that of original one -tube TV The color gamut of phosphor used in the projection TV is different to standard gamut of phosphor in NTSC. In this paper, we analyze the relationship between coordinates of RGB phosphor and RGB beam currents according to the color temperature in projection HDTV. We also proposed the range of reference white which maximize the luminance that viewer feel based on both Helmholtz-Kohlrausch effect which is visual property and degradation of image according to the change of beam profile by current-ratio.