Modified wide radiating lenses of the power-chip light emitting diodes for a direct-lit backlight

Chi Feng Chen, Cheng Chia Wu, Jhong Hao Wu

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Modified wide radiating lenses of the power-chip light emitting diodes (LEDs) for a direct-lit backlight unit of a liquid crystal display (LCD) are numerically investigated. To improve the optical properties of the backlight, the lens of the Golden DRAGON® ARGUS® LED, the cluster of LEDs, and the cluster arrangement for the 32-in bottom-lit backlight unit of a LCD are modified and verified by optical tracing simulation software. First, the central section shape is modified and analyzed to reduce the angular luminous intensity in the small angle range. The results show that the modifying lens method can effectively realize the aim. Then, several LEDs with the modified lenses are put in 32-in backlight. It is shown that the uniformity and efficiency of the new backlight are obviously better than the ones of the original type.

Original languageEnglish
Pages (from-to)847-852
Number of pages6
JournalOptik
Volume121
Issue number9
DOIs
StatePublished - May 2010

Keywords

  • Backlight unit
  • Direct-lit backlight
  • Light emitting diode (LED)
  • Liquid crystal display

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