Control circuit for supplying a current to display devices

Details Control circuit for supplying a current to display devices Control circuit for supplying a current to display devices

2005-05-24

2005-05-24

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C345S076000, C345S077000

Reexamination Certificate

active

06897619

ABSTRACT:
A control circuit includes a plurality of drive current output circuits, a control voltage generating circuit, a first current output circuit, a second current output circuit, a voltage divider and a compensation voltage generating circuit. The voltage divider has one end connected to the control voltage generating circuit and a plurality of nodes each of which connected to the respective drive current output. The drive current output circuit outputs the control voltage to the drive circuits based on a power supply voltage and the control voltage. The compensation voltage generating circuit outputs a compensated voltage based on the difference between the current outputted from the first current output circuit and the current outputted from the second current output circuit. In order to supply the compensation voltage to the other end of the voltage divider, the values of the respective control voltage are equalized.

REFERENCES:
patent: 6078150 (2000-06-01), Koyanagi et al.
patent: 6204610 (2001-03-01), Komiya
patent: 6518941 (2003-02-01), Kimura
patent: 6545651 (2003-04-01), Nishigaki et al.
patent: 01192573 (1989-08-01), None
patent: 2001-138567 (2001-05-01), None

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