Patent · US Active

Light emitting device driver chip

US9398657B2 · kind B2 · utility

0Cited by
4References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJan 13, 2015
Grant dateJul 19, 2016
Priority date
Expiry dateJan 13, 2035

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY02B20/30
  • WIPO fieldElectrical machinery, apparatus, energy
  • WIPO sectorElectrical engineering

Abstract

The present invention discloses a light emitting device driver chip for driving light emitting devices in series. The chip includes: plural pins electrically connected to corresponding light emitting devices, respectively, wherein an internal voltage is provided through a predetermined one of the pins; a voltage regulation circuit for providing an operation voltage according to the internal voltage; a switch circuit including plural switch groups electrically connected to corresponding pins, respectively; a current source circuit for providing a current to the light emitting devices; and a switch control circuit for controlling the switch groups to determine which light emitting device is turned ON. The light emitting device driver chip does not directly receive the rectified input voltage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.