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P‐41 Fresnel Diffraction Phenomena in Frontlights for Reflective LCDs
Author(s) -
Cornelissen Hugo J.,
Pooter Jacco A.,
Braat Joseph J. M.,
Wittermans Harro J.
Publication year - 2002
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 - 10.1889/1.1830802
Subject(s) - fresnel diffraction , optics , diffraction , fresnel number , fresnel zone , fresnel equations , physics , fresnel lens , materials science , refractive index , lens (geology)
In frontlights for reflective LCDs made from micro‐optically structured lightguides, unwanted shadows appear in certain viewing directions. It is shown that these shadows are wider than predicted from geometrical ray optics, and that they can not be eliminated by decreasing the micro‐optical structure size. These experimental observations can be explained accurately by taking Fresnel diffraction into account.