Perceived brightness of LED projector

Shih Fang Liao, Hung Yu Chou, Tsung Hsun Yang, Cheng Chung Lee, Kirk Chang

Research output: Contribution to journalConference articlepeer-review

21 Scopus citations


It is commonly observed that the LED projectors can provide with more perceived brightness by less stimulus luminance. In this work, the Helmholtz-Kohlrausch effect is applied for studying the enhanced perceived brightness of the LED projector. According to the equations developed by Nayatani’s group, the ratio of the enhanced perceived brightness of LED projector is evaluated as 25% to 30% as compared to traditional lamp projector in dark environment. However, in the normal office illumination level, the difference between the LED projector and the lamp projector diminishes.

Original languageEnglish
Pages (from-to)262-264
Number of pages3
JournalDigest of Technical Papers - SID International Symposium
Issue number1
StatePublished - 2009
Event2009 Vehicles and Photons Symposium - Dearborn, MI, United States
Duration: 15 Oct 200916 Oct 2009


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