Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2011-01-18
2011-01-18
Shalwala, Bipin (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C363S060000
Reexamination Certificate
active
07872646
ABSTRACT:
A power supply generating circuit, a display apparatus incorporating the same, and a portable terminal device using the display apparatus as an output display unit are provided. In a DC-DC converter having a charge pump circuit (31), a voltage dividing circuit (32), and a regulation circuit (33), p-channel MOS transistors (Qp21,Qp22,Qp31) are turned on/off based on an enable pulse enb to make the voltage dividing circuit (32) and a comparator (41) active only for a period of regulation time and inactive otherwise. This can cause a current to flow in voltage-divider resistors (R1,R2) and the comparator (41) only for a certain period of time required for the regulation operation, thus reducing the power consumption loss caused by a constant current flow in the voltage-divider resistors (R1,R2) and the comparator (41).
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Nakajima Yoshiharu
Toyozawa Noboru
Depke Robert J.
Holton Steven E
Rockey Depke & Lyons, LLC
Shalwala Bipin
Sony Corporation
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