Drive control circuit, emission control circuit, communication apparatus and drive control method
US7483021B2 · kind B2 · utility
2Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2005 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | Oct 29, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive control circuit sends out pulse signals of various pulse signals so as to control the light emission amount and luminance of LEDs by gradually increasing and decreasing the pulse width in predetermined cycles during predetermined periods based on parameters supplied from an LED drive controller that determine a first emission control processing period, a second emission control processing period, first to fourth slope periods and the like. The tone of an emitted color realized by a plurality of LEDs is controlled by synchronizing the periods of time of light emission control processings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.