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专利名称：Optical device with diffractive grating发明人：Antti Sunnari,Olli-Heikki Huttunen,Juuso
Olkkonen
申请号：US14429782申请日：20130918公开号：US09625717B2公开日：20170418
专利附图：
摘要：The invention relates to optical devices comprising a transparent substrate anda first transparent grating layer on the substrate, the grating layer comprisingperiodically alternating zones having different refractive indices. According to the
invention, the device comprises a second transparent grating layer located on top of thefirst grating layer and also comprising periodically alternating zones having differentrefractive indices so that the zones of the first grating layer having higher refractive indexare at least partly aligned with the zones of the second grating layer having lowerrefractive index and vice versa, the second grating layer reducing the amount of lightdiffracted to non-zero transmission orders. The invention allows for reducing the so-called rainbow effect for example in head-up displays (HUDs).
申请人：TEKNOLOGIAN TUTKIMUSKESKUS VTT
地址：Vuorimiehentie FI
国籍：FI
代理机构：Reed Smith LLP
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