公开(公告)号：EP3180559A4

公开(公告)日：2018-04-11

申请号：EP15832103

申请日：2015-08-10

申请人： GLO AB

发明人： KANESHIRO RONALD ,  WANG PING ,  PATTERSON FRANK ,  CARLISLE CLINTON ,  JANSEN MICHAEL

IPC分类号： F21S2/00 ,  F21V8/00 ,  G02B6/00 ,  G02F1/13357

CPC分类号： G02B6/0061 ,  G02B6/0025 ,  G02B6/0031 ,  G02B6/0036 ,  G02B6/0038 ,  G02B6/0055 ,  G02B6/0068 ,  G02B6/0073 ,  G02B6/0083 ,  G02B6/009 ,  G02B6/0091 ,  H01L2224/16225 ,  H01L2224/48091 ,  H01L2224/48464 ,  H01L2924/00014

摘要： An integrated back light unit can include a light guide plate having a non-uniform distribution of extraction features. The non-uniform distribution of the extraction features can be provided by an extraction-feature-free region in proximity to a light emitting device, and/or by a variable density of the extraction features that changes with distance from the light emitting device. Additionally or alternatively, the light guide unit can include a heterogeneous reflectivity surface that has a different reflectivity at proximity to the light emitting device assembly than at a distal portion of the light guide unit. The different reflectivity may be provided by a specular reflective material, diffusive reflective material, or a light absorbing material. The non-uniform distribution of extraction features and/or the heterogeneous reflectivity surface can be employed to enhance brightness uniformity of the reflective light and/or to control the temperature distribution within the light guide unit.