EP 1814365 A1 20070801 - LED driving device with pulse width modulation
Title (en)
LED driving device with pulse width modulation
Title (de)
LED-Ansteuervorrichtung mit Pulsweitenmodulation
Title (fr)
Dispositif de commande à DEL avec modulation de largeur d'impulsion
Publication
Application
Priority
CN 200610001583 A 20060124
Abstract (en)
The present invention discloses an LED driving device with pulse width modulation (PWM) capable of preventing the LED display from flickering. The LED driving device primarily comprises a PWM unit for modulating the ON/OFF signal with a PWM cycle from one signal of higher resolution to two or more signals of lower resolution. The modulation is executed with the proviso that the duty cycle of the PWM cycle is almost or completely preserved. Accordingly, the LED will be lit more frequently and perform preset brightness with a higher refresh rate.
IPC 8 full level
G09G 3/32 (2006.01); H05B 33/08 (2006.01); H05B 44/00 (2022.01)
CPC (source: EP US)
G09G 3/32 (2013.01 - EP US); H05B 45/20 (2020.01 - EP US); H05B 45/325 (2020.01 - EP US); G09G 3/2018 (2013.01 - EP); G09G 2320/0247 (2013.01 - EP)
Citation (applicant)
US 2003076048 A1 20030424 - RUTHERFORD JAMES C [US]
Citation (search report)
- [X] US 2003076048 A1 20030424 - RUTHERFORD JAMES C [US]
- [X] US 2002012008 A1 20020131 - TAKAGI YUICHI [JP]
- [A] US 2005184933 A1 20050825 - TOMOHARA KIYOHIDE [JP]
- [A] US 2003085749 A1 20030508 - XU PENG [US], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
EP 1814365 A1 20070801; EP 1814365 B1 20120523; CN 101009957 A 20070801; CN 101009957 B 20100512; ES 2388069 T3 20121008; PL 1814365 T3 20121130
DOCDB simple family (application)
EP 06005074 A 20060313; CN 200610001583 A 20060124; ES 06005074 T 20060313; PL 06005074 T 20060313