Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2006-10-24
2006-10-24
Lefkowitz, Sumati (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S092000, C345S093000, C349S038000, C349S039000, C349S139000
Reexamination Certificate
active
07126595
ABSTRACT:
Adapting to load currents which differ by more than 100 times between a scanning mode and a hold mode, a frequency of pump operation is decided according to the maximum value of the load currents, and circuit elements of a power supply, for example, such as capacitance of a capacitor for pump operation or a smoothing capacitor, element configurations of switching elements, or capacitance or resistance value of a CR oscillator are set based on this frequency, so that a load current detector lowers the frequency of the pump operation under light load to reduce a self-loss of power in the power supply. This realizes a charge-pump power supply which is installed in a liquid crystal display device of a terminal device of a portable phone, with reduced power consumption under light load and a longer standby time.
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Kumada Kouji
Ohta Takashige
Yanagi Toshihiro
Beck Alexander S.
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Lefkowitz Sumati
Sharp Kabushiki Kaisha
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