LED backlight module by lightguide-diffusive component

Rong Seng Chang, Jang Zern Tsai, Tung Yen Li, Hsiang Lin Liao

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


This study examines the luminance and uniformity characteristics of a newly invented secondary optical lens, called the "lightguide-diffusive component", which has a wide emission angle and is designed for thin direct LED backlighting applications. The LED backlight module is composed of, at the very least, a light source, a secondary lightguide-diffusive component with a newly designed micro-structure having a reflective bottom surface, and a flexible printed circuit (FPC) for LED lighting. This lightguide-diffusive component modifies the emission profile of a single LED to provide better illumination and greater uniformity. The newly designed secondary optical lens module is shaped to cover the LED array, resulting in a more uniform spatial light energy distribution on the emission plane of the LED backlight. The uniformity ratio for the new design shows an increase of 24%, from 60% to 84%, and the luminance a 23.29% improvement, from 10\thinspace000 nits to 12\thinspace329 nits.

Original languageEnglish
Article number6136207
Pages (from-to)79-86
Number of pages8
JournalIEEE/OSA Journal of Display Technology
Issue number2
StatePublished - 2012


  • Backlight module
  • LED
  • secondary lightguide-diffuser


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