Led luminance control circuit and backlight source of liquid crystal display
US8183788B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 2007 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Mar 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/064
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a LED luminance control circuit comprising one or several LEDs and a driving circuit, the driving circuit being connected in series with said one or several LEDs to provide energy to the one or several LEDs, wherein a control circuit is connected in parallel on both terminals of said one or several LEDs and controls on/off of the LEDs connected in parallel thereto. Connections between the several LEDs may be in parallel, in series, or combination thereof. The present invention also discloses an LED backlight source of a liquid crystal display using the above LED luminance control circuit. The present invention can implement the luminance control of various power LEDs quickly on basis of simplicity and low cost without influence on the luminance of other LEDs, by individual luminance control for every one or several LEDs, so as to solve some display technical problems when using LEDs as a display device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.