LIGHT EMITTING ELEMENT DRIVE CIRCUIT

LIGHT EMITTING ELEMENT DRIVE CIRCUIT

PROBLEM TO BE SOLVED: To prevent fluctuation of light emitting luminance due to fluctuation of LED. SOLUTION: A circuit formed of a transistor Q21, a diode D21, and a resistance R21 is connected in parallel with an LED 10 and a bonding resistance R'. The current flowing into this parallel circu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: KOBORI HIROSHI
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Zusammenfassung:PROBLEM TO BE SOLVED: To prevent fluctuation of light emitting luminance due to fluctuation of LED. SOLUTION: A circuit formed of a transistor Q21, a diode D21, and a resistance R21 is connected in parallel with an LED 10 and a bonding resistance R'. The current flowing into this parallel circuit becomes the current I1 which changes in accordance with fall of voltage VF in the LED 10 and bonding resistance R'. Therefore, the current which is proportional to such current I1 is supplied to the LED 10 from a transistor Q42. COPYRIGHT: (C)2006,JPO&NCIPI