Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2006-05-23
2006-05-23
Vu, David (Department: 2828)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C345S102000
Reexamination Certificate
active
07049754
ABSTRACT:
The impact of distributed capacitance on information handling system operations is reduced by introducing an impedance element in series with the ground of the source of the distributed capacitance for an overall reduction of capacitance. For instance, distributed capacitance is formed between a liquid crystal display illumination lamp and ground through a reflector disposed proximate the lamp and aligned so that an interior reflecting surface directs light toward imaging pixels. An insulating dielectric added to the outer surface of reflector and assembled to information handling system chassis ground with some surface area in common between the reflector and the system ground form a separate series capacitor between the lamp and ground. The insulation dielectric capacitance combines in series with the reflector capacitance to provide a resultant capacitance of less than the reflector capacitance. Reduced distributed capacitance of the lamp and wiring to ground reduces power loss and improves illumination brightness distribution across the lamp.
REFERENCES:
patent: 6919697 (2005-07-01), Jang
patent: 2002/0003525 (2002-01-01), Hwang
patent: 2002/0041280 (2002-04-01), Woo
Dell Products L.P.
Hamilton & Terrile LLP
Holland Robert W.
Vu David
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