System and methods of driving an electroluminescent lamp
US7402962B1 · kind B1 · utility
6Cited by
9References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2007 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Feb 11, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention include systems and methods of driving an electroluminescent lamp. In one embodiment, the electroluminescent lamp is driven to a first threshold during a first time period and then driven to successive voltages between the threshold and a maximum voltage during successive time. This method of driving the lamp waveshapes the lamp voltage signal. In one example, the thresholds are set to minimize audible noise from the electroluminescent lamp due to the piezoelectric effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.