Ramp voltage generating apparatus and active matrix...

Details Ramp voltage generating apparatus and active matrix... Ramp voltage generating apparatus and active matrix...

2006-05-02

2006-05-02

Dinh, Trinh (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169200, C315S169400, C315S291000, C315S307000, C345S004000, C345S076000, C345S211000, C345S204000

Reexamination Certificate

active

07038394

ABSTRACT:
A ramp voltage generating apparatus according to the present invention includes a ramp voltage generating circuit for generating a plurality of ramp voltages out of phase with each other from one ramp voltage, and a control circuit. The ramp voltage generating circuit includes a plurality of voltage generating circuit portions connected in parallel to a voltage input terminal. Each voltage generating circuit portion includes a voltage output terminal, a capacitor, an operational amplifier, a first switch, a second switch and a third switch. The control circuit turns on the third switches while shifting the time point of switching each of the third switches from off to on state, and the control circuit turns off the first switches and, also, turns on the second switches during the period including the fall time point of the ramp voltage input to the voltage input terminal.

REFERENCES:
patent: 6697057 (2004-02-01), Koyama et al.
patent: 2004/0095306 (2004-05-01), Fujiyoshi
patent: 2004/0227743 (2004-11-01), Brown
patent: 2005/0052447 (2005-03-01), Ishiyama
patent: 2005/0093958 (2005-05-01), Mori et al.
patent: 2005/0225518 (2005-10-01), Yamada et al.
patent: 10-312173 (1998-11-01), None
patent: 2002-202746 (2002-07-01), None
patent: 2003-241711 (2003-08-01), None

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