A highly directional light guide plate based on V-groove microstructure cell

Chi Feng Chen, Shin Hong Kuo

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


A new light guide plate (LGP) with highly directional emission properties based on V-groove cells has been investigated. To achieve high uniformity at normal luminance distributions for LCD backlight units (BLUs), we present a cell composed of multiple V-groove microstructures, and demonstrate its performance in a 10.1-inch BLU. We have found the density of the V-grooves to affect luminance distribution, and the directionality of emissions increases with number of V-groove microstructures in a cell. A cell composed of five V-groove microstructures delivered a 1.9-fold increase in optical efficiency when compared with a conventional BLU: the central luminance was 2.3 times greater, the main viewing angle was at -1°, and distribution of viewing luminance was almost symmetrical. In conclusion, our V-groove cell LGP for BLUs is thin and simple, providing high efficiency and high uniformity at normal luminance distributions.

Original languageEnglish
Article number6848751
Pages (from-to)1030-1035
Number of pages6
JournalIEEE/OSA Journal of Display Technology
Issue number12
StatePublished - 1 Dec 2014


  • Backlight unit (BLU)
  • display
  • light guide plate (LGP)


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