LED driver

Details LED driver LED driver

2005-11-01

2010-06-01

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S083000, C345S102000

Reexamination Certificate

active

07728798

ABSTRACT:
The present invention relates to an LED driver for driving a plurality of light emitting diodes (LEDs), comprising a current controller to control power supply of a predetermined power source unit to make a current flowing in the plurality of LEDs reach a predetermined target current value which sequentially changes corresponding to the respective LEDs; a plurality of divergence switches to flow or interrupt the current with respect to each of the plurality of LEDs; a bypass switch being connected in parallel with respect to the plurality of divergence switches and the plurality of LEDs and to flow or bypass the current supplied to the plurality of LEDs by being open or short-circuited; and a switch controller to sequentially open and close the plurality of divergence switches corresponding to change of the target current value and control the bypass switch to be short-circuited in a range where the current supplied to the LEDs increases, corresponding to the rise of the target current value. Thus, the present invention provides an LED driver which drives an LED in a low voltage to improve light efficiency.

REFERENCES:
patent: 5426446 (1995-06-01), Takei et al.
patent: 6618031 (2003-09-01), Bohn et al.
patent: 6798152 (2004-09-01), Rooke et al.
patent: 6864867 (2005-03-01), Biebl
patent: 6980181 (2005-12-01), Sudo
patent: 7262752 (2007-08-01), Weindorf
patent: 2002/0167473 (2002-11-01), Johnson et al.
patent: 2003/0095086 (2003-05-01), Neuhaeusler et al.
patent: 2003/0112205 (2003-06-01), Yamada
patent: 2004/0090403 (2004-05-01), Huang
patent: 2004/0196225 (2004-10-01), Shimada
patent: 2004/0227704 (2004-11-01), Wang et al.
patent: 2004/0233148 (2004-11-01), Tanghe et al.
patent: 2005/0200290 (2005-09-01), Sugimoto
patent: 2005/0225526 (2005-10-01), Chiu et al.
patent: 2005/0243022 (2005-11-01), Negru
patent: 2006/0038803 (2006-02-01), Miller et al.
patent: 2006/0197469 (2006-09-01), Kim
patent: 2006/0220570 (2006-10-01), Evans et al.
patent: 2006/0232219 (2006-10-01), Xu
patent: 2007/0171180 (2007-07-01), Akiyama
patent: 1427382 (2003-07-01), None
patent: 1441399 (2003-09-01), None
patent: 1 341 147 (2003-09-01), None
patent: 2001-76525 (2001-03-01), None
patent: 2002-244619 (2002-08-01), None
patent: 2004-93761 (2004-03-01), None
patent: 2004-157225 (2004-06-01), None

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