• IEIE Transactions on Smart Processing and Computing
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• 제6권2호
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• pp.124-128
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• 2017

A light guide improves the spatial resolution of a gamma ray imaging system by diffusing the scintillation light. Similarly, light diffusion film, which has been applied to flat-panel-display engineering, spreads the light from the light guide panel. In this study, we adopted light diffusion film for the light guide of a gamma ray imaging system, and evaluated its diffusion characteristics. We compared the light diffusion performance of the film to an ordinary acrylic plate. As a result, the diffusion film widely spreads scintillation light. As for the thickness of the light guide, we acquired more distinct images with three films overlapped than with an acrylic plate. We expect light diffusion film to be a promising candidate for light guides in gamma ray imaging systems.

• 한국위성정보통신학회논문지
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• 제11권1호
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• pp.51-54
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• 2016

본 논문은 빛을 일정한 방향으로 전달하는 광가이드 특성을 이용하여 디지털 사이니지 베젤에서의 광학적 불연속성을 개선하고자 한다. 광학적 성능이 우수한 Polycarbonate에 Light guide film을 부착, 필름 내부에 존재하는 마이크로 사이즈의 구조에 의한 빛의 굴절, 반사, 산란의 효과를 발생하였다. 아크(arc) 모양의 polycarbonate 광가이드 필름을 각기 다른 색의 LED source (적색, 녹색)에 기계적으로 밀착하여 광학적 전달효과를 관찰하였다. 아크 형태의 광가이드 필름에 빛의 반사 및 산란이 발생하여 녹색과 붉은색의 혼합색인 주황색이 발생하는 것을 확인하였다. 이는 일반적으로 베젤이 존재하는 멀티 디지털 사이니지 시스템의 약점인 디스플레이의 광학적 불연속성을 해결할 수 있을 것으로 판단된다.

• KIEAE Journal
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• 제2권2호
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• pp.33-38
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• 2002

There are a number of practical uses for devices which are capable of piping large amounts of light: illumination of areas where there would be maintenance, safety, or security problems with electronic light sources; piping sunlight into indoor areas for illumination; and the conversion of high luminous efficacy, good color quality, high intensity discharge lamps into more acceptable linear of area sources of light. Prism light guides are hollow structures which pipe light by means of total internal reflectin(TIR). These devices are unique in their ability to combine the efficiency of TIR with the relatively low cost of hollow structure. An important application stems from their ability to transform a point source of light such as an incandescent or discharge lamp into a linear or area source of light or illumination. We report the development of an economical, flexible prismatic film for fabricating the light guide wall. This guide geometries and films are currently under development.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.95-98
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• 2009

This paper dealt with the design guide of the conventional edge-lit backlight optic with which the on-axis luminance could be increased by trying to improve the light condensing efficiency of a bright enhancement film (BEF). First, the general design guide concerned with the backlight optic was proposed, and then its validness was experimentally proved by conducting design examples with haze controls of both diffuse film and microdot material printed on the backside of the light guide plate. Experimental results showed that the variation range of the on-axis luminance by the present approach was about $5{\sim}9%$, which would be by no means negligible in the practical application.

• Current Optics and Photonics
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• 제1권2호
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• pp.101-106
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• 2017

Optical structures of a tapered ultra-thin light guide film (LGF) were optimized by optical simulation for increasing coupling efficiency between light sources and the LGF. A serration pattern on the entrance side surface could provide a comparable coupling efficiency to that of the conventional LGF where a linear, asymmetric prism array was formed on the taper surface. Several micro-patterns were applied to the top and/or bottom surface of the LGF for achieving better luminance property, and it was found that an optimized micro-pyramid pattern exhibited the highest average luminance together with satisfactory luminance uniformity.

• 한국위성정보통신학회논문지
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• 제12권2호
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• pp.11-14
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• 2017

본 논문은 프리즘 구조물의 집광효과를 이용하여 옥외용 사이니지 이산형 LED 패널의 광학적 불연속성을 개선할 수 있는 방법적 접근에 관한 것이다. 광투과성이 우수한 Polycarbonate에 MEMS(Microelectromechanical systems) 공정 및 극초단파(Femto-second) 레이저를 이용하여 프리즘 형태를 패터닝을 하였다. 패터닝된 polycarbonate는 light guide film의 역할을 하여 서로 다른 디스플레이 패널에서 발생하는 빛을 프리즘 구조에 의해 한 곳으로 모이게 함을 확인하였다. Polycarbonate와 디스플레이 패널의 간격에 따라 디스플레이 패널간의 거리를 조절할 수 있었으며 한 곳으로 모인 빛은 마치 두 디스플레이 패널이 연결된 것과 같은 효과를 나타내었다. 이는 아웃도어 사이니지용 디스플레이 패널에서 발생하는 문제점인 광학적 불연속성을 개선할 수 있을 것으로 보인다.

• 한국태양에너지학회 논문집
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• 제22권1호
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• pp.81-86
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• 2002

Solar daylighting system provides free and comfort lighting, but its design and control has been key issue due to heavy light collecting system. One of the solutions for the heavy weight issues would be using a light framed film such as fresnel and prism lens. This prototype system consists of light collector, light transformer and light guide luminaire. The light collector which is installed at window or the rooftop concentrates solar light, the collected beam is converted to suitable light by the light transformer. and the prism light guide luminaire has been used to distribute light emitted from light transformer for illumination. In this paper, the design concept and performance of light collector in this prototype system are presented.

• Korea-Australia Rheology Journal
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• 제15권4호
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• pp.167-171
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• 2003

The backlight unit (BLU) is used as a light source of TFT liquid-crystalline-display (TFT-LCD) module. In this backlight unit, one of important components is the light guide, which is usually made of transparent polymers. Currently, the screen-printing method is mainly used for the light guide as a manufacturing process. However, it has limitation to the flexibility of three-dimensional optical design. In the present paper a new alternative manufacturing method for the light guide with low-cost is proposed. This manufacturing method is named as direct surface forming (DSF), which is very similar to the well-known hot embossing except for partial contact between mold and substrate. The results of this new manufacturing method are presented in terms of processing condition, dimensional accuracy, productivity, etc.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.693-696
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• 2009

The ray-tracing technique was used to optimize the light guide plate for the purpose of improving the on-axis luminance on the edge-lit backlights. One-dimensional prisms and engraved V-shaped patterns were applied to the upper and the lower surfaces of the light guide plate, respectively. By optimizing the apex angles of these micro-structures, as well as the shape of the reverseprism film put over the light guide plate, highly-collimated light-output distribution could be obtained on the backlight, which may contribute to the development of mobile LCD's with low power consumption.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 The Korea-Japan Plastics Processing Joint Seminar
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• pp.73-77
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• 2003

The backlight unit(BLU) is used as a light source of TFT liquid-crystalline-display (TFT-LCD) module. In this backlight unit, one of important components is the light guide, which is usually made of transparent polymers. Currently the screen-printing method is mainly used for the light guide as a manufacturing process. However, it has limitation to the flexibility of three-dimensional optical design. In the present paper a new alternative manufacturing method for the light guide with low-cost is proposed. This manufacturing method is named as direct surface forming (DSF), which is very similar to the well-known hot embossing except for partial contact between mold and substrate. The results of this new manufacturing method are presented in terms of processing condition, dimensional accuracy, productivity, etc.