NVIS compatible backlight device and LCD using the same
US10203447B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2016 |
| Grant date | Feb 12, 2019 |
| Priority date | — |
| Expiry date | Sep 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133626
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Exemplary embodiments provide an electronic display assembly comprising a liquid crystal layer and a light guide positioned behind the liquid crystal layer. The light guide preferably includes a light emission surface and a light-collecting portion opposing the light emission surface. A pair of opposing side portions may define the periphery of the light guide. A first plurality of LEDs are placed so as to direct the emitted light into the light-collecting portion. An NVIS filter is preferably placed adjacent to at least one of the side portions. A second plurality of LEDs are placed to direct the emitted light through the NVIS filter and into a side portion of the light guide. Alternative embodiments can contain directing elements to direct the light from the second plurality of LEDs into the edge portions of the light guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.