Light-emitting element driving circuit having a switching...

Details Light-emitting element driving circuit having a switching... Light-emitting element driving circuit having a switching...

2007-06-05

2007-06-05

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S205000

Reexamination Certificate

active

10873302

ABSTRACT:
A light-emitting element driving circuit comprises a current supplier serially connected to a light-emitting element and operative to supply a current to the light-emitting element; and a switching unit operative to control switching between the states of the current supplied to the light-emitting element from the current supplier. The switching unit includes a current path consisting of a diode and a semiconductor switching element. The diode is connected in parallel with the light-emitting element and in a forward direction directed from an anode to a cathode of the light-emitting element. The semiconductor switching element is connected serially to the diode and operative to switch between the states of conductive and non-conductive based on a control signal. A voltage drop across the current path when the semiconductor switching element is made conductive is determined lower than a forward voltage of the light-emitting element when it emits light.

REFERENCES:
patent: 4806803 (1989-02-01), Yamashita
patent: 5430749 (1995-07-01), Horie
patent: 6898090 (2005-05-01), Nishida et al.
patent: 2000-232240 (2000-08-01), None

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