• Title, Summary, Keyword: Backlight unit

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Design and Fabrication of Scanning Backlight Unit using Flat Fluorescent Lamp (면광원을 사용한 Scanning Backlight Unit의 설계 및 제작)

  • Chae, Hyung-Jun;Jung, Yong-Min;Hwang, Sun-Nam;Hur, Jeong-Wook;Lee, Jun-Young;Lim, Sung-Kyoo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.5
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    • pp.376-382
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    • 2008
  • In this paper, scanning backlight unit which can reduce motion blur was designed and fabricated using flat fluorescent lamp. The FFL(flat fluorescent lamp) is in the limelight as a new illuminant of next generation BLU(backlight unit), because of simple assembly and reduction of driving components. In order to control lamp brightness, lamp on-time was controlled. In this experiment, it was confirmed that lamp brightness can be dimmed linealy and in a wide range.

Design and Analysis of Diffractive Grating Imprinted Light-guide Plate for LCD Illumination

  • Choi, Hwan-Young;Park, Young-Pil
    • Journal of Information Display
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    • v.5 no.1
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    • pp.7-15
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    • 2004
  • A highly simplified backlight unit mainly composed of diffractive grating in sub-micron order imprinted light-guide plate (LGP) is proposed for edge-lit backlight unit. Optical characteristics of the imprinted LGP are examined by RCWA and the performance is verified through Monte Carlo simulation. Results show that the diffraction efficiency, luminous flux and its uniformity over the area are significantly affected by the angle of incident ray. Consequently couples of design considerations are additionally proposed to enhance luminous flux. In terms of peak luminance and out-coupling luminous flux, the experimental results are agreed well with the performance simulation. Finally, compared with optical characteristics of conventional backlight unit, we could conclude that the proposed simplified backlight unit made of diffractive grating imprinted light-guide plate is a good substitute for the conventional backlight unit.

Electric-optical Characteristics of Backlight Unit with LED Light Source in Low Temperature Condition

  • Han, Jeong-Min;Seo, Dae-Shik
    • Transactions on Electrical and Electronic Materials
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    • v.8 no.2
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    • pp.93-96
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    • 2007
  • LCD (liquid crystal display) industry is needed to goods of high reliability and is interested in products without harmful material. In this experiment, we made the LED backlight unit for Automotive-navigation. And for making this backlight unit we used to eight side emitting type white LEDs with 1 W high power of the lumileds company. We could know that this backlight unit releases to 6500 nit in 14 W power consumption and start up voltage time is under the 15ms in the ambient temperature $-20\;^{\circ}C$.

TFT-LCD용 고취도 직하방식 백라이트의 설계 및 제작

  • 박종리;임성규
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.195-199
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    • 2001
  • 본 논문은 고휘도 직하방식의 Backlight Unit을 광학 Simulation을 이용하여 설계 및 제작하였다. 직하방식의 Backlight는 휘도 균일도에 많은 문제점을 보이고 있으나 본 논문에서는 18"Backlight를 휘도 균일도 90%의 고휘도, 높은 휘도균일도의 Backlight Unit을 설계하였다. 특히 본 논문에서는 12개의 램프를 한 개의 인버터로 구동함으로써, Backlight Unit의 광 효율 향상과 제작 단가의 저하를 동시에 얻을 수 있다.

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Design of LCD Backlight Unit Coupled with Micro Fresnel Lens Array (배열형 소형 프레넬 렌즈가 결합된 LCD 백라이트의 설계)

  • Jeong, Man-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.2
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    • pp.1-7
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    • 2006
  • A light guided plate coupled with the micro Fresnel lens array(MFTA) is designed to improve the efficiency of the LCD backlight unit. Blazed Frenel lens and binary multi-level Fresnel lens are adapted for the MFLA. This type of MFLA can replace the prism sheet and diffuser sheet which are used for the conventional type of the LCD backlight unit. The luminance and uniformity are calculated to verify the performance of the MFLA type LCD backlight unit.

Fabrication of a Large LCD Backlight Unit with Red, Green, and Blue LED Lamps

  • Kim, Hee-Tae;Noh, Seung-Jeong;Choi, Yong-Seok;Yu, Soon-Jae
    • Journal of Information Display
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    • v.10 no.3
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    • pp.97-100
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    • 2009
  • A backlight unit for a 42-inch LCD TV was manufactured with red, green, and blue LED lamps. The luminous and light extraction efficiencies of the LED lamps were increased by improving their light reflection structures and thermal properties. The blue, green, and red LED lamps showed different luminous efficiencies as a function of the input current. Compared to the conventional red LED lamp, however, the developed red LED lamp showed very high luminous efficiency in a low drive current. Taking these luminous efficiencies into account, the fabricated backlight unit showed high energy efficiency, low power consumption, and a wide color gamut.

Design of Backlight Unit using Micro Fresnel Lens Array (Micro Fresnel Lens Array를 이용한 Backlight Unit 설계)

  • Ryu, Jae-Sun;Jeong, Man-Ho
    • Korean Journal of Optics and Photonics
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    • v.16 no.3
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    • pp.217-224
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    • 2005
  • A light-guide plate of an LCD backlight coupled with a microfresnel lens array (MFLA) is designed and analyzed. Computer simulated results of optical characteristics of our MFLA-type light-guided plate compared with the conventional prism-type one are presented. We show that the MFLA-type light-guide plate can replace well the conventional prism-type plate.

Design and Simulation of White Color Mixing Lens for Backlight Unit

  • Hwang, Sung-Kyung;Lim, Mee-Hyun;Han, Hae-Wook;Cho, Min-Su;Lee, Jae-Ho;Jang, Kyeng-Kun;Kang, Sin-Ho;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.229-230
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    • 2009
  • This paper proposes a new design of ultra-slim color mixing lens (CML) for backlight unit (BLU), and presents simulated performance of the design. The novel color mixing structure has a shorter mixing length (< 1cm) than the existing color mixing structure, and achieves high efficiency and uniformity.

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Electric-optical Characteristics of LED Flat Light Source in Low Temperature Condition (저온환경에서의 LED 평판 조명의 전기광학적 특성에 대한 연구)

  • Choi, Dae Seub
    • Proceedings of the KIEE Conference
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    • pp.940-941
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    • 2015
  • LCD (liquid crystal display) industry is needed to goods of high reliability and is interested in products without harmful material. In this experiment, we made the LED backlight unit for Automotive-navigation. And for making this backlight unit we used to eight side emitting type white LEDs with 1W high power of the lumileds company. We could know that this backlight unit releases to 6500 nit in 14W power consumption and start up voltage time is under the15ms in the ambient temperature $-20^{\circ}C$.

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LCD backlighting system with high luminance and good uniformity (LCD backlight unit의 고분자 산란형 도광판에 관한 연구)

  • Jung, Il-Yong;Park, Woo-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.173-176
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    • 2000
  • we analyzed multiple ray tracing in the highly scattering optical transmission(HSOT) polymer plate by means of the Monte carlo simulation. Light transmission behavior in the light guide was simulated by a 3-dimensional ray tracing program considering scattering angle given by the Mie theory and mean free path. To improve the uniformity of the conventional HSOT backlight unit, We employed additionally dot patterns. For the proposed structure, we calculated the light transmission behavior and obtained a bright and uniform backlight unit for a large size LCD panel of more than 12 inch.

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