Liquid crystal display system with lamp feedback
US7394209B2 · kind B2 · utility
29Cited by
156References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2004 |
| Grant date | Jul 1, 2008 |
| Priority date | — |
| Expiry date | Jun 16, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display system and CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL ignition by accounting for the parasitic capacitance in the resonant tank circuit. Additionally, the circuit is self-learning and is adapted to determine the optimum operating frequency for the circuit with a given load. An over-voltage protection circuit can also be provided to ensure that the circuit components are protected in the case of open-lamp condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.