| 发明名称 |
Variable Focal Backlighting |
| 摘要 |
A backlight unit includes a waveguide assembly having a first wedge and a birefringent wedge disposed adjacent to, and arranged nose-to-tail with, the first wedge, to define an interface of the waveguide assembly. The birefringent wedge has different indices of refraction for light propagating through the waveguide assembly in first and second polarization states. The first wedge is configured to propagate the light in the second polarization state at a different speed than the birefringent wedge. A liquid crystal layer is configured to selectively switch the light between the first and second polarization states. |
| 申请公布号 |
US2016231583(A1) |
申请公布日期 |
2016.08.11 |
| 申请号 |
US201615131879 |
申请日期 |
2016.04.18 |
| 申请人 |
Microsoft Technology Licensing, LLC |
发明人 |
Travis Adrian |
| 分类号 |
G02B27/28;G02F1/13;G02F1/13363;F21V8/00 |
主分类号 |
G02B27/28 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A backlight unit comprising:
a waveguide assembly comprising a first wedge and a birefringent wedge disposed adjacent to, and arranged nose-to-tail with, the first wedge, to define an interface of the waveguide assembly, wherein:
the birefringent wedge has different indices of refraction for light propagating through the waveguide assembly in first and second polarization states; andthe first wedge is configured to propagate the light in the second polarization state at a different speed than the birefringent wedge; and a liquid crystal layer extending along the waveguide assembly, the liquid crystal layer being configured to selectively switch the light between the first and second polarization states. |
| 地址 |
Redmond WA US |
