Enhancement of the optical performances for the LED backlight systems with a novel lens-cap

Jee Gong Chang, Charles Lun De Liao, Chi-Chuan Hwang

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

12 Citations (Scopus)


A novel dual-cone-shaped side-emitting lens cap for High Brightness Light Emitting Diodes (HB-LEDs) is proposed for improving brightness and high uniformity of the direct LED acklight Units (BLUs) for large area LCD-TVs. Combining the designed lens cap with red, green and blue (RGB) chips on a Metal Core Printed Circuit Board (MCPCB), the LED module with the proposed cap is able to provide a compact white light source with unique features such as instant color variability and lower power usage, etc. The dual-cone-shaped of the proposed lens cap is designed to emitting most of the light rays to the sides, only a small portion of light upward along the optical axis of the lens, providing a uniform luminance distribution and the high brightness on the backlight. In addition, a small, half-circle effective surface is designed and upon the proposed LED module about 10mm, the surfaces of which are attached with reflective films to increase the level of light mixing in the larger, global reflector optical box. With the structure of the LED module well designed, the LED backlight Module would design for the large area LCD-TV using the fewer number of LEDs and also have low power consumption. The results indeed identify the attributes of the BLU, which make it possible to achieve excellent backlight performance using a direct illumination approach from the light source of "Dual-Cone-Shaped Side-Emitting Lens Cap of LEDs".

Original languageEnglish
Title of host publicationNovel Optical Systems Design and Optimization IX
Publication statusPublished - 2006 Nov 6
EventNovel Optical Systems Design and Optimization IX - San Diego, CA, United States
Duration: 2006 Aug 152006 Aug 16

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherNovel Optical Systems Design and Optimization IX
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

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


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