한국산학기술학회논문지 (Journal of the Korea Academia-Industrial cooperation Society)

  • 제13권7호
  • /
  • Pages.3146-3151
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  • 2012
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  • 1975-4701(pISSN)
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  • 2288-4688(eISSN)
한국산학기술학회 (The Korea Academia-Industrial cooperation Society)
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고 효율 LED를 이용한 LCD 패널 구동회로의 설계 및 제작

The Fabrication and Design of Driving Circuit for LCD panel using the high efficiency LED

  • 류장렬 (공주대학교 전기전자제어공학부)
  • Ryu, Jang-Ryeol (Division of Electrical, Electronic & Control Engineering Kongju National University)
  • 투고 : 2012.03.27
  • 심사 : 2012.07.12
  • 발행 : 2012.07.31
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⟨ 이전 논문 다음 논문 ⟩

초록

LED가 의료장비용 LCD 패널의 광원으로 사용되는 경우, 밝기, 휘도 균일성, 고출력, 백색의 조절 능력, 온도 등을 고려한 우수한 광학 기구의 설계 및 제작이 필요하다. 본 논문에서는 휘도 및 균일도, dimming 범위의 증대, 잡음 발생 억제 등에서 측면발광 방식의 45인치 의료기기 등의 LED 후면광 시스템 및 구동회로를 설계하고 그 시제품을 제작하였다. 시제품의 휘도, dimming 범위, flicker 잡음, black level, 온도 특성 등을 측정한 결과, 휘도의 범위는 3,000 ~ 25,000[$cd/m^2$], 색 좌표는 x 좌표 0.3144, y좌표 0.3076의 평균값을 보였으며, 온도 특성은 휘도가 20,000[$cd/m^2$]이상의 제어에서 냉각 시스템이 필요한 것으로 나타났다. 한편, dimming의 범위는 27.0[$cd/m^2$] ~515[$cd/m^2$], flicker noise는 80kHz에서 발생하지 않았고, black level 0.7[$cd/m^2$]~0.1 [$cd/m^2$]를 얻어 의료기기 등의 LCD 패널에 적용할 수 있을 것으로 판단되었다.

For using them as a optical source of inspections equipment for LCD panel, the design ofexcellent backlight system, brightness uniformity and high power and good protection against heat is essential.In this paper, backlight system which is built in the 45 inch side emitting LCD backlight by LED arraystructure and driving circuit were designed and developed. After that, their performances were measured. Itshowed the luminance from 3,000 to 25,000[$cd/m^2$], the mean value x:0.3144, y:0.3076 of x-y chromaticity,dimming range of 27~515[$cd/m^2$], free flicker noise in the 80kHz and black level of 0.7~0.1[$cd/m^2$], thermaltest of cooling system in 20,000[$cd/m^2$] over values.

키워드

참고문헌

  1. Y. J. Lee, H.C.Kuo, and S.C.Wang "Enhancing the Output Power of GaN-based LEDs Grown on Wet-Etched Pattrened Sapphire Substrates", IEEE PHOTONIC TECHNOLOGY LETTERS, Vol. 18, No. 10, pp. 2289-2291, May, 2006.
  2. S. Nakamura and G. Gasol, "The Blue Laser Diode", New York: springer, Vol. 10, No. 3,
  3. Y.J.Lee,J.M.Hwang,T.C.Hsu and S.C.Wang, "Study of the Extraction Power Dependent Internal Quentum Efficiency in IngaN/gaN LEDs Grown on Patterned Sapphire Substrate", IEEE Journal of selected Topics in Quantum Electronics, Vol. 15, No. 4, pp. 445-448, Nov., 2009.
  4. C.S.Chang, et al, "Nitride-Based LEDs With Textured Side Walls", IEEE PHOTONIC TECHNOLOGY LETTERS, Vol. 16, No. 3, pp. 1152-1154, Mar., 2004. https://doi.org/10.1109/LPT.2004.824656
  5. Dang Hoang Long and In Kag Hwang, "Design Optimization of Photonic Crystal Structure for Improved light Extraction of GaN LED", IEEE Journal of selected Topics in Quentum Electronics, Vol. 15, No. 4, pp. 1257-1263, July, 2009. https://doi.org/10.1109/JSTQE.2009.2014471
  6. Dang Hoang Long and In Kag Hwang, "Design Optimization of Photonic Crystal Structure for Improved light Extraction of GaN LED", IEEE Journal of selected Topics in Quentum Electronics, pp. 223-226, May, 1997.
  7. Jang-Ryeol Ryu, Boo-Hyung Lee, "Design and Implementation of High Luminous Line LED Illuminator", Journal of Korean Institute of Information technology, Vol. 6, No. 5, pp.161-169, 2008.
  8. Jang-Ryeol Ryu, Boo-Hyung Lee, and Gu-Yuol Lee, "Comparative Analysis of LED Array methods to improve a Luminous Intensity Uniformity of LED back Light in BLU", Journal of Korean Institute of Information technology, Vol.7, No.1, pp.1-8, 2009.
  9. Jang-Ryeol Ryu, Boo-Hyung Lee, Hyun-Sang Park, and Gu-Yuol Lee, "The Design and Development of LED Optical Engine Prototype for Large Size LCD panel inspection equipments", Journal of Korean Institute of Information technology, Vol.7, No.6, pp.17-26, 2009.
  10. Jang-Ryeol Ryu, Boo-Hyung Lee, and Kwang-Kyu Lee, "The Fabrication and Design of LED Backlight Array and Driving Circuit for LCD panel equipped with Medical Instruments", Journal of Korean Institute of Information technology, Vol.8, No.4, pp.1-7, 2010.
  11. H.J.Park, T.C.Kang, S.N.Hwang, H.J.Kim, J.U.Mun and J.R.Ryu,"The Design of Driving Circuit for LCD panel used LED", Journal of Korean Institute of Information Technology, Proceeding of the 2012 KIIT Summer Conference, pp.422-426, 2012. 6.