Apparatus and method for creating large display back-lighting
US7468723B1 · kind B1 · utility
63Cited by
6References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2005 |
| Grant date | Dec 23, 2008 |
| Priority date | — |
| Expiry date | Sep 20, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driver for a series-coupled white LED string is provided. The driver includes a boost converter that is arranged to provide an output voltage from a source voltage. Also, the driver includes one switch that is coupled across half of the series-coupled LEDs, and another switch that is coupled across the other half of the series-coupled LEDs. A 50% duty cycle signal is employed to control the switches. While the boost converter is enabled, one of the switches is on and the other is off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.