LED driving device
US8653749B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2011 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Feb 18, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a light emitting diode (LED) driving device for driving a multi-channel LED element or an LED array for each channel, the LED driving device including: a constant current driver driving currents flowing in each channel; and a minimum voltage selector receiving voltage levels of each channel and selecting a minimum voltage level to thereby feedback the selected minimum voltage level to the constant current driver, wherein matching characteristics of currents flowing in each channel is improved and a size of an integrated circuit (IC) chip is also reduced as compared to a case according to the related art, thereby making it possible to reduce a production cost and satisfy the trend of miniaturization of the chip, while solving a performance deterioration problem due to deterioration of the matching of the currents between the channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.