Dispersed crystallite up-conversion displays
US6654161B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2001 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Feb 3, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/904
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A two and three dimensional display based on up conversion of near infrared light to the visible. The display medium is a transparent polymer containing particles of crystals doped with Yb3+ and other rare earth ions. The Yb3+ ions absorb light from a commercially available diode laser emitting near 975 nm and transfer that energy to the other dopant ions. Using a fluoride crystal host, NaYF4, co-doped with Tm3+ ions we obtain blue light at ˜480 nm, with Ho3+ or Er3+ ions we obtain green light at ˜550 nm and with Er3+ we obtain red light at ˜660 nm. The display medium is also used with a preferred component layout with experimentation test data, along with applications for full color, high brightness, high resolution, displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.