Light emitting element driving apparatus, method of driving...

Details Light emitting element driving apparatus, method of driving... Light emitting element driving apparatus, method of driving...

2007-03-14

2008-11-25

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000

Reexamination Certificate

active

07456584

ABSTRACT:
A light emitting element driving apparatus for driving a light emitting element, includes driving means for a executing PWM driving operation to drive the light emitting element at a predetermined duty cycle and for executing a soft-start driving operation during each ON-period in the PWM driving operation. During the soft-start driving operation, a current value of current supplied to the light emitting element is increased from a first constant current value up to a second constant current value. The driving apparatus includes parameter adjusting means for controlling the driving means such that the second constant current value is supplied to the light emitting element for a period that is longer than a period from a beginning of the ON-period to a time at which the current value of the current supplied to the light emitting element reaches the second constant current value.

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