• Title, Summary, Keyword: Laser and display convergence technology

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Development of a time multiplexed HMD type multi-focus 3D display system

  • Kim, Dong-Wook;Lim, Tong-Kun;Kwon, Yong-Moo;Kim, Sung-Kyu
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1314-1317
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    • 2006
  • The problem of the conflict between eye convergence and accommodation can be induced at Stereoscopic or multi-view 3D display system using binocular disparity. A multi-focus 3D display system was developed, which can solve the problem. LEDs are used instead of galvano scanner and laser to avoid mechanical moving part at the 3D display system.

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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.

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.

Digital Holographic Display System with Large Screen Based on Viewing Window Movement for 3D Video Service

  • Park, Minsik;Chae, Byung Gyu;Kim, Hyun-Eui;Hahn, Joonku;Kim, Hwi;Park, Cheong Hee;Moon, Kyungae;Kim, Jinwoong
    • ETRI Journal
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    • v.36 no.2
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    • pp.232-241
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    • 2014
  • A holographic display system with a 22-inch LCD panel is developed to provide a wide viewing angle and large holographic 3D image. It is realized by steering a narrow viewing window resulting from a very large pixel pitch compared to the wave length of the laser light. Point light sources and a lens array make it possible to arbitrarily control the position of the viewing window for a moving observer. The holographic display provides both eyes of the observer with a holographic 3D image using two vertically placed LCD panels and a beam splitter to support the holographic stereogram.

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.

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.

Alignment Patterns and Position Measurement System for Precision Alignment of Roll-to-Roll Printing (롤투롤 인쇄전자공정에서 중첩정밀도 향상을 위한 정렬패턴과 위치 측정시스템)

  • Seo, Youngwon;Yim, Seongjin;Oh, Dongho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.12
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    • pp.1563-1568
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    • 2012
  • Printed electronics is a technology used for forming electronic circuits or devices, and it is used in the manufacture of many products such as RFID tags, solar cells, and flexible display panels with a much lower cost than in the case of semiconductor process technology. Web-guide-type printing such as roll-to-roll printing is a method used to produce printed electronic devices in a large volume. To commercialize such products, highly precise alignment between printed layers is required. In this study, a highly precise alignment system is proposed, and some experimental results are compared with those obtained using a laser surface vibrometer to illustrate the reliability of the proposed system. The robustness of the proposed system to web deformation is also considered experimentally.