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    • 9. 发明授权
    • Lighting devices with patterned printing of diffractive extraction features
    • 具有衍射提取特征的图案印刷的照明装置
    • US08834004B2
    • 2014-09-16
    • US13572813
    • 2012-08-13
    • David S. ThompsonZhaohui YangMatthew S. StayVivian W. Jones
    • David S. ThompsonZhaohui YangMatthew S. StayVivian W. Jones
    • F21V8/00
    • G02B6/0058G02B5/1819G02B6/0035G02B6/0036G02B6/0038G02B6/005G02B6/006
    • Extended area lighting devices include a light guide and diffractive surface features on a major surface of the light guide, at least some diffractive surface features adapted to couple guided-mode light out of the light guide. The diffractive features include first and second diffractive features disposed on respective first and second portions of the major surface. A patterned light transmissive layer, including a second light transmissive medium, optically contacts the second diffractive features but not the first diffractive features. A first light transmissive medium optically contacts the first but not the second diffractive features. The first and second portions may define indicia, and the first and second diffractive features provide low distortion for viewing objects through the light guide such that the indicia is not readily apparent to users when guided-mode light does not propagate within the light guide. Optical films having such diffractive features are also disclosed.
    • 扩展区域照明装置包括在导光体的主表面上的光导和衍射表面特征,至少一些衍射表面特征适于将导模光耦合到光导中。 衍射特征包括设置在主表面的相应第一和第二部分上的第一和第二衍射特征。 包括第二透光介质的图案化透光层光学地接触第二衍射特征而不是第一衍射特征。 第一透光介质光学地接触第一但不是第二衍射特征。 第一和第二部分可以限定标记,并且第一和第二衍射特征提供用于通过导光体观察物体的低失真,使得当导光模式光不在光导内传播时,标记对于用户来说不容易显现。 还公开了具有这种衍射特征的光学膜。