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dc.contributor.authorCheng, Chu-Mingen_US
dc.contributor.authorChern, Jyh-Longen_US
dc.date.accessioned2014-12-08T15:12:41Z-
dc.date.available2014-12-08T15:12:41Z-
dc.date.issued2008-01-20en_US
dc.identifier.issn0003-6935en_US
dc.identifier.urihttp://dx.doi.org/10.1364/AO.47.000431en_US
dc.identifier.urihttp://hdl.handle.net/11536/9755-
dc.description.abstractWe developed an analytical method of illuminance formation for mixed-color LEDs in a rectangular light pipe in order to derive American National Standards Institute (ANSI) light uniformity, ANSI color uniformity, and color difference of light output using photometry, nonimaging, and colorimetry. The analytical results indicate that the distributions of illuminance and color difference vary with different geometric structures of light pipes and the location of the light sources. It was found that both the ANSI light and the ANSI color uniformity on the exit plane of the light pipe are reduced exponentially with the increase in length of the light pipe. It is evident that a length scale L/A greater than unity assures that the mixed-color LED sources on the entrance plane are uniformly illuminated with acceptable uniform brightness and color on the exit plane of the rectangular light pipe, where L is the length of the light pipe, and A is a constant, which is a geometric parameter for the scale unit of the light pipe's input face. Furthermore, the ANSI light uniformity can be minimized, and the ANSI color uniformity can be maximized under the condition of multilight-source locations P = Q = +/- A/4, where P and Q are the coordinates along the long axis and the short axis, respectively, with one being the entrance plane of the light pipe. We can conclude that the optimum form factor of the light pipe is a square shaped cross section, with the length scale L/A being equal to unity and with multilight sources located individually on positions of A/4 in order to achieve very uniform illuminations with the highest light efficiency and compact package for the optical system with mixed-color LEDs, where L is the length of the light pipe. (C) 2008 Optical Society of America.en_US
dc.language.isoen_USen_US
dc.titleIlluminance formation and color difference of mixed-color light emitting diodes in a rectangular light pipe: an analytical approachen_US
dc.typeArticleen_US
dc.identifier.doi10.1364/AO.47.000431en_US
dc.identifier.journalAPPLIED OPTICSen_US
dc.citation.volume47en_US
dc.citation.issue3en_US
dc.citation.spage431en_US
dc.citation.epage441en_US
dc.contributor.department光電工程學系zh_TW
dc.contributor.departmentDepartment of Photonicsen_US
dc.identifier.wosnumberWOS:000253266800015-
dc.citation.woscount11-
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