Television receiver and cold-cathode tube dimmer

Electric lamp and discharge devices: systems – Plural load device systems

Reexamination Certificate

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Details

C315S276000, C315S291000, C315S352000

Reexamination Certificate

active

06949893

ABSTRACT:
In a cold-cathode dimmer, a current detector includes a LPF for removing the frequency component of a lighting/driving signal for a lighting driver from the output of a diode for rectifying the voltage across a current detecting resistor and passing the frequency component of an intermittent control signal for controlling the duty ratio of the lighting/driving signal. A luminance controller includes a current value computing section for producing, as a current average value, a multiplied result of a ratio of an interval during which the output level of the LPF is higher than a prescribed level to a period of the output of the LPF and the output level of the LPF during the interval during which it is higher than the prescribed level, and a duty controller for stabilizing a luminance of cold-cathode tubes at a target luminance in such a manner that the duty ratio of the intermittent control signal is set at a value corresponding to a difference between the current average value outputted from the current value computing section and a target value thereof.

REFERENCES:
patent: 2001/0035698 (2001-11-01), Nakatsuka et al.
patent: 2004/0113569 (2004-06-01), Henry
patent: 2004/0217719 (2004-11-01), Higuchi
patent: 2005/0088115 (2005-04-01), Kimura et al.
patent: 6-302387 (1994-10-01), None
patent: 11-122937 (1999-04-01), None
patent: 3038717 (2000-03-01), None
patent: 2002-124395 (2002-04-01), None
Concise Statement of Relevancy Between The Invention and Materials (1 page).
Patent Abstracts of Japan, Publication No. 11-122937 dated Apr. 30, 1999 (1 page).
Patent Abstracts of Japan, Publication No. 06-302387 dated Oct. 28, 1994 (1 page).
Patent Abstracts of Japan, Publication No. 2002-124395 dated Apr. 26, 2002 (1 page).

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