Voltage controlled light source and image presentation...

Details Voltage controlled light source and image presentation... Voltage controlled light source and image presentation...

2006-01-31

2008-11-25

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S246000, C315S20000A, C315S308000, C315S291000

Reexamination Certificate

active

07456586

ABSTRACT:
A device (300) includes a driver circuit (200) having a field effect transistor (FET) (30), acting as a current sink, a current sense network (10), an operational amplifier (opamp) (20), and a light emitting diode (LED) (40). Current sense network (10) is connected to the source electrode (32) of FET (30), as well as to the inverting input terminal (22) of opamp (20). The non-inverting input terminal (24) of opamp (20) is coupled to a variable voltage control signal source (VDAC) (110). The output terminal (26) of opamp (20) is coupled to the gate electrode (36) of FET (30). LED (40) is connected to the drain electrode (34) of FET (30). The brightness of LED (40) is controlled by varying the amplitude of the VDAC control signal, and on/off status is controlled by a switch S1disposed between the output terminal (26) of opamp (20) and the FET (30).

REFERENCES:
patent: 4160934 (1979-07-01), Kirsch
patent: 4987348 (1991-01-01), Wong
patent: 5025204 (1991-06-01), Su
patent: 6097360 (2000-08-01), Holloman
patent: 6954039 (2005-10-01), Lin et al.
patent: 7061394 (2006-06-01), Biebl
patent: 2002/0140380 (2002-10-01), Biebl
patent: 2007/0159421 (2007-07-01), Peker et al.

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