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20.1: Perceived Brightness of LED Projector
Author(s) -
Liao ShihFang,
Chou HungYu,
Yang TsungHsun,
Lee ChengChung,
Chang Kirk
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256758
Subject(s) - projector , brightness , luminance , overhead projector , optics , computer science , computer vision , mathematics , computer graphics (images) , physics
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.