Controlling color shift in EL phosphors
US6111362A · kind A · utility
7Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Nov 5, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An EL lamp is powered by bursts of high frequency signal repeated at low frequency, i.e. having a low duty cycle envelope, in order to shift the color of light emitted by the phosphor in the lamp without degrading the life of the lamp. The bursts include one or more consecutive cycles of a high frequency signal or several closely spaced cycles of a high frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.