Display device with directional control of the output, and a back light for such a display device
US10393943B2 · kind B2 · utility
2Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2015 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Mar 22, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2213/001
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display backlight comprises an edge-lit waveguide having an array of light out-coupling structures which for example each comprise a projection into the waveguide. Each projection has a beam redirecting face which is at an angle a to the normal. The angle a and the refractive index of the waveguide as well as outside the waveguide (over the output face) are designed to satisfy various relationships, which ensure that the optical output can be selected to be within a desired angular range in a generally forward direction (and thus not clipped).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.