Dual-lamp driving circuit for liquid crystal displays
US8203525B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2009 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Oct 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/282
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dual-lamp driving circuit includes a first frequency switch control circuit, a second frequency switch control circuit, a pulse-width modulation (PWM) control circuit, a first power stage circuit, a second power stage circuit, a conversion circuit, and a feedback circuit. The first frequency switch control circuit receives a first enable signal, and outputs a first frequency switch signal according to the first enable signal. The second frequency switch control circuit receives a second enable signal, and outputs a second frequency switch signal according to the second enable signal. The PWM control circuit outputs various PWM control signals according to the first frequency switch signal and the second frequency switch signal. The feedback circuit feeds back a first current signal from the first lamp to the frequency switch control circuit, and a second current signal from the second lamp to the frequency switch control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.