Light emitting diode multiphase driver circuit and method

Details Light emitting diode multiphase driver circuit and method Light emitting diode multiphase driver circuit and method

2006-05-22

2008-10-21

Vo, Tuyet (Department: 2821)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S083000, C345S084000, C315S291000, C315S18500S, C315S20000A, C315S312000

Reexamination Certificate

active

07439944

ABSTRACT:
A method and a circuit for driving light emitting diodes (LEDs) in multiphase are provided. A string of LEDs divided into groups connected to each other in series is provided. Each group is coupled to ground through separate conductive paths. A phase switch is provided in each conductive path. Increasing the input voltage turn on the string of LEDs, group by group in the sequence downstream the string. To reduce power dissipation, the phase switch of an upstream group is turned off when next downstream group is turned on.

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patent: 5663719 (1997-09-01), Deese et al.
patent: 7327051 (2008-02-01), Ito et al.
patent: 2006/0197722 (2006-09-01), Nakajima
patent: 2006/0256050 (2006-11-01), Ikeda
patent: 2007/0229416 (2007-10-01), De Oto

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