Patent · US Active

Control circuit for light emitting diode arrangements

US8624510B2 · kind B2 · utility

0Cited by

0References

10Claims

0Family size

Assignee

Minebea Co., Ltd. · JP

Inventors

Mykhaylo Raykhman · Munich, DE
Manfred Schlenk · Augsburg, DE
Hans Hoffmann · Mainz, DE

Key dates

Filing date	Feb 14, 2012
Grant date	Jan 7, 2014
Priority date	—
Expiry date	Jun 6, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/50
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A control circuit (1) for light emitting diode arrangements (11), used particularly for backlighting LC flat screens. The circuit has a plurality of control channels (5, 5′) in each of which one or more light emitting diode arrangements (11) are disposed. The circuit has a balancing device (23) which allows currents in the individual control channels (5, 5′) to be balanced. Each control channel (5, 5′) has a separate dimming device (13) through which a brightness of the light emitting diode arrangements (11) in this control channel (5, 5′) can be changed separately from the other control channels (5, 5′). For this purpose, the control circuit has a compensation device (16) which allows a flow of current in the individual control channels (5, 5′) to be balanced when the light emitting diodes have different brightnesses.

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