• Title, Summary, Keyword: 레이저와 디스플레이 융합 기술

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Trend of Crystallization Technology and Large Scale Research for Fabricating Thin Film Transistors of AMOLED Displays (AMOLED 디스플레이의 박막트랜지스터 제작을 위한 결정화 기술 동향 및 대형화 연구)

  • Kim, Kyoung-Bo;Lee, Jongpil;Kim, Moojin;Min, Youngsil
    • Journal of Convergence for Information Technology
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    • v.9 no.5
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    • pp.117-124
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    • 2019
  • This paper discusses recent trends in the fabrication of semiconducting materials among the components of thin film transistors used in AMOLED display. In order to obtain a good semiconductor film, it is necessary to change the amorphous silicon into polycrystalline silicon. There are two ways to use laser and heat. Laser-based methods include sequential lateral solidification (SLS), excimer laser annealing (ELA), and thin-beam directional crystallization (TDX). Solid phase crystallization (SPC), super grain silicon (SGS), metal induced crystallization (MIC) and field aided lateral crystallization (FALC) were crystallized using heat. We will also study research for manufacturing large AMOLED displays.

An Optical Quenching and Efficiency of Laser for the Virtual Display System (허상 디스플레이에 적용되는 레이저 다이오드의 출력 효율과 파장 변이에 대한 연구)

  • Chi, Yongseok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.9
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    • pp.129-134
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    • 2016
  • This paper studies the high frequency PWM (pulse width modulation) driving technique to increase an optical efficiency and to prevent an optical color quenching of blue laser for head up display on vehicles using digital micro mirror device (DMD) panel and yellow phosphor wheel. The proposed approach adaptively drives the current pulse width modulated signals of high optical power of blue laser to increase the lifetime and to decrease the stem temperature of laser. This method stabilizes the temperature of laser according to the driving environment and the forward current capacity. By the proposed method, the brightness of blue laser is improved by about 37% compared to the continuous waveform current driving method.

양자점을 이용한 808 nm 파장대역의 고출력 레이저 칩 개발

  • O, Hyeon-Ji;Park, Seong-Jun;Kim, Min-Tae;Kim, Ho-Seong;Song, Jin-Dong;Choe, Won-Jun;Myeong, Jae-Min
    • Proceedings of the Materials Research Society of Korea Conference
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    • pp.87.2-87.2
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    • 2012
  • 고출력 반도체 레이저 다이오드는 발진 파장 및 광 출력에 따라 다양한 분야에 응용되고 있으며, 특히 발진파장이 808 nm 및 1470 nm 인 고출력 레이저 다이오드의 경우 재료가공, 펌핑용 광원 (DPSSL, 광섬유 레이저), 의료, 피부미용 (점 제거), 레이저 다이오드 디스플레이 등 가장 다양한 응용분야를 가진 광원 중의 하나라고 할 수 있다. 일례로 재료가공의 경우, 레이저 용접, 레이저 인쇄, 하드디스크의 레이저 텍스쳐링 등 그 응용분야는 무수히 많으며, 최근에는 미래 성장동력 사업의 하나로 중요한 이슈가 되는 태양전지에서 에지 분리 (edge isolation), ID 마킹, 레이저 솔더링 등에서 필수불가결한 광원으로 각광받고 있다. 808 nm 대역 In(Ga)AlAs quantum dots laser diode (QDLD) 성장을 위하여 In(Ga)AlAs QD active 와 In(Ga)AlAs QD LD 성장으로 크게 분류하여 여러 가지 test 실험을 수행하였다. 우선 In(Ga)AlAs QD LD 성장에 앞서 high power LD에 적용 가능한 GaAs/AlGaAs quantum well의 성장 및 전기 측정을 수행하여 그 가능성을 보았다. In(Ga)AlAs QD active layer의 효과적인 실험 조건 조절을 위해 QD layer는 sequential mithod (ex. n x (InGaAlAs t sec + InAs t sec + As 10 sec)를 사용하였다. In(Ga)AlAs QD active layer는 성장 온도, 각 sequence 별 시간, 각 source 양, barrier 두께 조절 및 타입변형, Arsenic flux 등의 조건을 조절하여 실험하였다. 또한 위에서 선택된 몇 가지 active layer 를 이용하여 In(Ga)AlAs QD LD 성장 조건 변화를 시도하였다.

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Optical Design of an Automotive Headlamp System Using a Laser Diode (레이저 다이오드를 이용한 자동차용 헤드 램프 광학계 설계)

  • Park, Eunmi;Park, Hyeonjoon;Kim, Jongtae
    • New Physics: Sae Mulli
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    • v.67 no.12
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    • pp.1534-1540
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    • 2017
  • The development of Nichia's blue light-emitting diodes (LEDs) combining white LEDs with blue LED chips and YAG phosphors has become the most promising solid-state lighting technology. However, the LED has a high operation current, which causes a problem of efficiency deterioration due to a decrease in the quantum efficiency internally or externally due to a temperature rise in the device. The temperature rise also causes a change in the peak wavelength and has a detrimental effect on the phosphor. In contrast, laser diodes do not experience this efficiency loss. In this study, phosphor modeling for realizing white light by using a laser and downward light modeling using a LED headlamp structure were studied. Because the modeled laser has divergent angles, we simulated various optical systems to capture the focal position. We selected the optimized optical system modeling based on simulation, and we present various research directions based on an analysis of the ECE-R112 regulation.

Proposition on Five Sense Smart Screen Elevator System based on Laser Display (레이저 디스플레이 기반 오감만족 스마트 스크린 엘리베이터 시스템 제안)

  • Park, Joo-Bong;Shin, Seung-Jung
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.15 no.1
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    • pp.187-190
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    • 2015
  • Recently, most of people wants to have smart life for themselves like smart phones. In this paper, we propose the smart elevator based on the laser screen, speakers and air fresheners. Using this elevator, we could enjoy the various screen inside, and we could keep contacting with manager for wifi in the emergency situation. Also, the elevator could be operated with user's motion for Kinect. Finally, we did the survey for understanding preference of smart elevator. The grops are elevator manufacturing company, elevator distribution corporation and consumers, each group have 200 people.

Characteristics of 32 × 32 Photonic Quantum Ring Laser Array for Convergence Display Technology (디스플레이 융합 기술 개발을 위한 32 × 32 광양자테 레이저 어레이의 특성)

  • Lee, Jongpil;Kim, Moojin
    • Journal of the Korea Convergence Society
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    • v.8 no.5
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    • pp.161-167
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    • 2017
  • We have fabricated and characterized $32{\times}32$ photonic quantum ring (PQR) laser arrays uniformly operable with $0.98{\mu}A$ per ring at room temperature. The typical threshold current, threshold current density, and threshold voltage are 20 mA, $0.068A/cm^2$, and 1.38 V. The top surface emitting PQR array contains GaAs multiquantum well active regions and exhibits uniform characteristics for a chip of $1.65{\times}1.65mm^2$. The peak power wavelength is $858.8{\pm}0.35nm$, the relative intensity is $0.3{\pm}0.2$, and the linewidth is $0.2{\pm}0.07nm$. We also report the wavelength division multiplexing system experiment using angle-dependent blue shift characteristics of this laser array. This photonic quantum ring laser has angle-dependent multiple-wavelength radial emission characteristics over about 10 nm tuning range generated from array devices. The array exhibits a free space detection as far as 6 m with a function of the distance.

Large Area Nanostructure Fabrication by Laser Interference Lithography (레이저 간섭 리소그래피를 이용한 대면적 나노 구조체 제작)

  • Jeong, Il Gyu;Kim, Jongseok;Hahn, Jae Won;Lee, Sung Ho
    • Journal of the Semiconductor & Display Technology
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    • v.11 no.1
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    • pp.7-11
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    • 2012
  • One dimensional and two dimensional nano patterns were fabricated on a 4-inch substrate by Laser Interference Lithography (LIL). Mach-Zehnder interferometer was setup to obtain the interference patterns and adjusted the pattern sizes with change of incident angle. We could obtain a periodic structure with a period of 440 nm using 266 nm laser, and demonstrated a pattern size with $293{\pm}25nm$ over a 4-inch substrate.

A Feasibility Study on the Infrastructure Project of Femto Fusion Technology (펨토 융합기술 기반구축사업 타당성 분석 연구)

  • Kim, Dae Ho;Kim, Tae Hyung
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.8 no.1
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    • pp.1-11
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    • 2013
  • The femto fusion technology refers to not only the technology for femtosecond($10^{-15}$ second) laser and but also the fusion technology of its application. This technology is comparable to the nano technology, the extreme technology on the space, and is of extreme time-domain technology. Now, we need to develop the hyperfine and high-precision femto fusion process technology which allows to miniaturize and highly integrate the products of mobile, semiconductor and display industries, the national main focusing growth industries. However, The femtosecond laser fabrication technology is essential in the development of fusion technology, but only a few of domestic researchers can handle the former. Under this condition, our government plans to develop the "femto fusion technology infrastructure project" as one of the ICT research infrastructure. So the purpose of this study is to analyze the feasibility of this project. We applied AHP(analytic hierarchy process) for this study. The final result shows that all the repondent's score is over 0.55 and the aggregated score is 0.846. And as a consequence, we can conclude that to do this project is feasible.

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Characteristics of Excimer Laser-Annealed Polycrystalline Silicon on Polymer layers (폴리머 위에 엑시머 레이저 방법으로 결정화된 다결정 실리콘의 특성)

  • Kim, Kyoung-Bo;Lee, Jongpil;Kim, Moojin;Min, Youngsil
    • Journal of Convergence for Information Technology
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    • v.9 no.3
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    • pp.75-81
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    • 2019
  • In this work, we investigated a low temperature polycrystalline silicon (LTPS) thin film transistors fabrication process on polymer layers. Dehydrogenation and activation processes were performed by a furnace annealing at a temperature of $430^{\circ}C$ for 2 hr. The crystallization of amorphous silicon films was formed by excimer laser annealing (ELA) method. The p-type device performance, fabricated by polycrystalline silicon (poly-Si) films, shows a very good performance with field effect mobility of $77cm^2/V{\cdot}s$ and on/off ratio current ratio > $10^7$. We believe that the poly-Si formed by a LTPS process may be well suited for fabrication of poly-Si TFTs for bendable panel displays such as AMOLED that require circuit integration.

Optical Technology of Mechanical Industries in the 21st Century (21세기 기계산업의 변화 - 광기술의 발전 동향)

  • Joo, Ki-Nam
    • Transactions of the KSME C: Technology and Innovation
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    • v.5 no.1
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    • pp.53-61
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    • 2017
  • In this review paper, the trend for optical technology is described as the development of mechanical industries in the $21^{st}$ century. Optical technology has been essential in various industries such as mechanical, electronic industries as the convergence technology. Based on the roadmap of optical science and technology, 12 working groups are categorized as the technical point of view and most of them are closely related to mechanical industries. Especially, solid-state lighting, optical metrology and industrial laser processing are important technologies in precision engineering and manufacturing. This paper introduces these optical technologies and their technological issues to look into the development trends and expectation.