Power supply generating circuit, display apparatus, and...

Details Power supply generating circuit, display apparatus, and... Power supply generating circuit, display apparatus, and...

2006-10-31

2006-10-31

Chang, Kent (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C327S536000, C327S143000

Reexamination Certificate

active

07129939

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).

REFERENCES:
patent: 5939866 (1999-08-01), Bjorkengren
patent: 6041011 (2000-05-01), Umezawa et al.
patent: 6091282 (2000-07-01), Kim
patent: 6476665 (2002-11-01), Buchschacher
patent: 6710773 (2004-03-01), Jenkins et al.
patent: 6727681 (2004-04-01), Morita
patent: 6847231 (2005-01-01), Kinugawa et al.
patent: 2002/0036636 (2002-03-01), Yanagi et al.

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