Design of integrated light guide plate with functional structure of enhanced diffusion length for ultra-slim LED backlight unit

Hye Ran Moon, Min Ho Shin, Jae Yong Lee, Kyu Jin Jang, Young Ok Chung, Young Joo Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)


An integrated light guide plate (LGP) with a functional structure for a longer diffusion length to decrease the thickness was proposed and designed for the large area direct-type LED backlight unit (BLU). The integrated LGP is composed of a concave cone structure on the top surface and a rugged bottom surface. The light emitted from the LED sources can be reflected on the top surface and diffuse effectively inside the LGP and in the bottom air-gap, which is placed below the LGP to realize sufficient diffusion length even in the ultra-slim structure. After comparing the optical simulation results with the measured data from the fabricated hexagonal unit cell of an LGP, we verified our design concept and realized the integrated LGP. The final LGP for a 55-inch LED display shows a brightness uniformity of 90.5% with a reduced number of 81 LEDs and a thickness of 6 mm, a remarkably reduced value compared with previous direct-type large area LED backlight units.

Original languageEnglish
Article number6913493
Pages (from-to)44-52
Number of pages9
JournalIEEE/OSA Journal of Display Technology
Issue number1
Publication statusPublished - 2015 Jan 1


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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