• 전자공학회논문지 IE
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• v.48 no.4
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• pp.19-24
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• 2011

Advances in mobile communications, portable computing and personal electronics have led consumers to demand large viewing area, bright, high resolution, compact and long life portable displays. Pico projectors are the latest technology to prove that big things often do come in small packages. Our goal in this paper was to implement a portable, low power, and highly adaptable miniature pico projector system. The pico projector is designed many functions of the pico projector solutions, multimedia, and T-DMB broadcasting.

• Optical Science and Technology
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• v.20 no.3
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• pp.19-21
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• 2016

• The Optical Journal
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• s.133
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• pp.28-32
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• 2011

2010년 연말을 기준으로 우리나라의 스마트폰의 사용자 수가 1천만명을 넘어섰다. 이것은 단순한 이동통신의 개념에서 모바일 컴퓨팅 시대의 도래를 통계적으로 보여주고 있는 것이다. 특히, 다양한 응용프로그램의 등장은 새로운 비즈니스를 탄생시켰으며 응용프로그램의 개발자나 이를 사용하는 소비자도 편리함에 공감하고 있다. 이러한 응용프로그램의 등장은 좀 더 뛰어난 기능을 갖는 부품이나 모듈의 개발을 촉진시켰고 기능이 앞선 부품이나 모듈이 탑재된 정보기기에는 더욱 다양한 응용프로그램이 개발되어 나오는 선순환이 자리를 잡았다. 결국 끊임없는 혁신만이 경쟁에서 살아남는 시대가 된 것이다. 본 고에서는 소형화된 스마트폰 및 태블릿 PC 등이 갖는 디스플레이 크기의 제약을 극복하는 해결방안으로 제시되고 있는 피코프로젝터의 개발 및 기술 동향에 대해서 기술하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.9
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• pp.97-105
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• 2011

This paper proposes a new "Live Book Service" that is combined the analog contents such as paper books and digital contents with various digital multimedia elements, and this service can project the additional digital multimedia contents on the analog paper. Also, we developed a monolithic stand type system which is composed of camera and pico projector, so that it can demonstrate the proposed contents. We also devised the low computational cost algorithm in bare-hands recognition which can be used as the interface between the system and users. In addition, to recognize the bare-hands which can be used as the interface between the digital and users, we make the low cost algorithm. Therefore this can be the interaction between the system and users. As a result, our proposed system can be used as a useful tool for various e-book or u-learning fields that requires high efficiency and much immersion.

• Korean Journal of Optics and Photonics
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• v.31 no.2
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• pp.105-110
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• 2020

A compact beam combiner based on two-mode interference (TMI) in multimode waveguides is proposed, and its feasibility is shown through simulation with the three-dimensional beam propagation method. The input waveguides are separated by about 1 ㎛ at the interface with the multimode waveguide, so that the fabricated waveguide pattern is well repeated. The power transmission to the output port from the red, green, and blue input port is 93.5%, 94%, and 93%, respectively. When the wavelength deviation from a center wavelength is 10 nm, the power transmission is maintained to be greater than 90%. When the waveguide width error is 40 nm, the power transmission is maintained to be greater than 85% for all the three colors. The polarization dependence of the beam combiner is almost negligible, and its size is as tiny as 0.02 × 4 ㎟.