Cold cathode tube lighting device, tube current detecting...

Details Cold cathode tube lighting device, tube current detecting... Cold cathode tube lighting device, tube current detecting...

2006-08-22

2008-12-02

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S274000, C315S279000, C315S308000, C315S324000

Reexamination Certificate

active

07459865

ABSTRACT:
A cold cathode tube lighting device is provided which is capable of achieving stable luminance when driven by applying driving pulses to input terminals on both sides of each of two or more cold cathode tubes. Each of currents flowing through coils in each of coil units on both sides of each of two or more cold cathode tubes is detected by voltage detecting sections and a tube current flowing through each of the cold cathode tubes based on a value obtained by adding each of the currents using an adder and a duty ratio of each of driving pulses is controlled so that the tube current becomes a specified current value to keep the luminance of the cold cathode tubes constant.

REFERENCES:
patent: 2006/0038508 (2006-02-01), Lin et al.
patent: 2001-52891 (2001-02-01), None
patent: 2002-17090 (2002-01-01), None
patent: 3096242 (2003-06-01), None
patent: 2004-235123 (2004-08-01), None
patent: 2004-335443 (2004-11-01), None
patent: 2005-63941 (2005-03-01), None
patent: 2005-63970 (2005-03-01), None

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