Patent · US Active

System and method for controlling a multi-string light emitting diode backlighting system for an electronic display

US7777704B2 · kind B2 · utility

45Cited by

2References

24Claims

0Family size

Assignee

mSilica, Incorporated · US

Inventors

Dilip S · Saratoga, US
Gurjit Thandi · San Jose, US
Hendrik Santo · San Jose, US
Kien Vi · Palo Alto, US

Key dates

Filing date	Jan 12, 2007
Grant date	Aug 17, 2010
Priority date	—
Expiry date	Dec 16, 2028

Classification

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

Abstract

The present invention relates to displays that use LED strings for backlighting. A lead string is provided with continuous drive voltage and the non-lead strings are provided with pulsed drive pulses. The string having the highest forward voltage is selected as the lead string. Feedback information indicative of the currents flowing through the non-lead strings is used to determine the duty cycles of the voltage pulses provided to drive the non-lead strings. The non-lead strings are controlled using pulsed drive voltages to minimize power dissipation in the circuit.

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