Design of optical module with high stability, high angular color uniformity, and adjustable light distribution for standard lamps

Yu Yu Chang, Zi Yan Ting, Ching Yi Chen, Tsung Hsun Yang, Ching Cherng Sun

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In the paper, an optical design for a standard light source is proposed and demonstrated to perform high stability, high angular CCT (correlated color temperature) uniformity, and adjustable light pattern from a Lambertian-like pattern to a narrow light pattern with a full-width at half-maximum (FWHM) angle of 60°. The optical module contains a color-mixing cylinder, a diffuser, and an absorbed cylinder. The simulation well predicts the corresponding measurements and the angular CCT deviation can be kept a certain low level, which is much lower than a general phosphor converted white LED. In addition, we apply a pcW-LED of CREE XML as the light source to the optical module to show the general adoptability of the optical module. The measurement shows that the similar behavior, with adjustable light pattern from 120° to 60°. In addition, the angular correlated color temperature deviation (ACCTD) is always kept an extremely low level.

Original languageEnglish
Article number6684299
Pages (from-to)223-227
Number of pages5
JournalIEEE/OSA Journal of Display Technology
Volume10
Issue number3
DOIs
StatePublished - Mar 2014

Keywords

  • Fluorescent and luminescent materials
  • light-emitting diodes (LEDs)
  • wavelength conversion devices

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