Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2006-12-20
2008-08-12
Owens, Douglas W. (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S276000
Reexamination Certificate
active
07411354
ABSTRACT:
A feedback and protection circuit is provided for detecting voltage and current of a cold cathode fluorescent lamp (CCFL) of a liquid crystal display (LCD) panel backlight apparatus and integrating all voltage and current input signals to output single current and voltage feedback signals to a PWM controller, so as to stabilize and control the voltage and current of the CCFL and determine whether any detected input signal is abnormal. If any CCFL is short circuited (CCFL is touched by people) or open circuited (CCFL is not lit), an abnormal status protection signal will be produced and sent to the PWM controller to stop all outputs of the backlight apparatus to prevent damages to circuit components or injuries to people. The circuit is designed in an integrated circuit to achieve the effects of reducing the area occupied by the circuit component layout and lowering the overall cost.
REFERENCES:
patent: 6011360 (2000-01-01), Gradzki et al.
patent: 6509696 (2003-01-01), Bruning et al.
patent: 6982886 (2006-01-01), Fukumoto
patent: 2006/0006811 (2006-01-01), Green et al.
Hsu Da-Jing
Yang Hui-Qiang
A Minh Dieu
King Anthony
Niko Semiconductor Co., Ltd.
Owens Douglas W.
WPAT, P.C.
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