LED backlight system with fiber-optic red,green, blue to white color combiner

Hye Rim Kim, Yunsong Jeong, Jhang Woo Lee, Kyunghwan Oh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

As an application in the backlight system of small LCD display, we realized a pure white light source by mixing red, green, blue (RGB) lights using a 3 × 3 Hard Plastic Cladding Fiber (HPCF) coupler. We also proposed the 0.44 inch LED backlight system with these fiber-optic pure white sources and characterized its illumination characteristics. Using optimized fusion-tapering technique, we fabricated HPCF coupler which combines three input lights over the circularly formed waist. HPCF has the core diameter of 200 μm and clad diameter of 230 μm. The fabricated 3×3 HPCF coupler has the perfect uniformity of about 0.3 dB, low insertion loss of 5.5 dB, and low excess loss of 0.8 dB, which shows excellent uniform power splitting ratio. In order to improve the transmission performance, The RGB chip LEDs were butt-coupled directly to the ferruled input ports of the coupler and packaged by TO46-can type. In the produced white color by HPCF coupler, the photometric brightness at the circular endface of outputs of HPCF coupler was in a rage of 10062 - 10094 cd/m2. The fiber optic white color combiner provides tunable white sources excluding heat source and having thickness of 200 μm. We also proposed a 0.44 inch LED backlight system with these fiber-optic pure white sources. With the proposed device, we obtain the improved uniformity in luminance distribution and wide color gamut by using the white light mixing red, green and blue lights.

Original languageEnglish
Title of host publicationPassive Components and Fiber-based Devices III
Volume6351 I
DOIs
Publication statusPublished - 2006 Dec 27
EventPassive Components and Fiber-based Devices III - Gwangju, Korea, Republic of
Duration: 2006 Sep 52006 Sep 7

Other

OtherPassive Components and Fiber-based Devices III
CountryKorea, Republic of
CityGwangju
Period06/9/506/9/7

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Kim, H. R., Jeong, Y., Lee, J. W., & Oh, K. (2006). LED backlight system with fiber-optic red,green, blue to white color combiner. In Passive Components and Fiber-based Devices III (Vol. 6351 I). [63510M] https://doi.org/10.1117/12.691228