Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2004-05-14
2010-10-26
Mengistu, Amare (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S210000, C345S204000
Reexamination Certificate
active
07821511
ABSTRACT:
A supply voltage conversion circuit allowing fabrication of a charge pump circuit having a large current capability with a small area is provided. In a charge pump DC-DC converter (10) for converting a supply voltage VDD1to a supply voltage VDD2, a level shifter (12) implements amplitude conversion to convert from a control pulse with amplitude of VSS-VDD1to a control pulse with amplitude of VSS-VDD2. By using the control pulse having the converted amplitude as a pumping pulse, a flying capacitor (C11) is charged/discharged by MOS transistors (Qp11), and (Qn11) of a charge pump circuit (11), and switching of MOS transistors (Qn12), and (Qp12) coupled to the output of the flying capacitor (C11) is controlled.
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Kida Yoshitoshi
Nakajima Yoshiharu
Mengistu Amare
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Patel Premal
Sony Corporation
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