Light-emitting element driving circuit and device using the same

Details Light-emitting element driving circuit and device using the same Light-emitting element driving circuit and device using the same

1998-03-06

2000-06-20

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315307, 3151693, 372 38, H03K 508

Patent

active

060781505

ABSTRACT:
A light-emitting element driving circuit includes a drive transistor having a first terminal receiving a power supply voltage, a second terminal coupled to an anode of a light-emitting element, and a control terminal receiving an input signal, the drive transistor supplying a pulse current and a first bias current to the light-emitting element. A constant-current source is coupled to the anode of the light-emitting element and supplies a second bias current to the light-emitting element. A compensation circuit controls the second bias current so that a variation in the first bias current due to a temperature variation can be compensated for thereby the sum of the first and second bias currents is kept constant.

REFERENCES:
patent: 4735473 (1988-04-01), Migozzi et al.
patent: 4819241 (1989-04-01), Nagano
patent: 5349595 (1994-09-01), Ogawa et al.
patent: 5406172 (1995-04-01), Bennett
patent: 5546218 (1996-08-01), Komatsubara et al.
patent: 5835250 (1998-11-01), Kanesaka

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