Charge pump type power supply circuit and driving circuit...

Details Charge pump type power supply circuit and driving circuit... Charge pump type power supply circuit and driving circuit...

2005-05-10

2005-05-10

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S544000, C327S589000, C345S211000

Reexamination Certificate

active

06891427

ABSTRACT:
A driving circuit of a display device such as a liquid crystal generates power supply clocks (1and2) based on a system clock during the normal display operation which is not a power save mode. The generated power supply clocks are supplied, directly or after inversion, to the switches (SW1through SW4(and SW5through SW8)) in a charge pump type power supply circuit (300) for switching the connection of capacitors (C1and C2(and C11and C12)) in the power supply circuit (300). In this manner, supply voltages VDD2and VDD3which function as the driving power supply for a driving circuit (100) and a display panel (200) can be obtained at the power supply circuit (300) by boosting the input voltage Vin. The driving circuit (100) stops supply of the power supply clocks to the power supply circuit (300) when a transition to the power save mode is instructed and a power save control signal generated by a CPU I/F circuit (16) is changed, thereby suspending generation of the supply voltage an consumption of power consumption at the circuit and display panel.

REFERENCES:
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patent: WO9942894 (1999-08-01), None
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patent: 10-304653 (1998-11-01), None
patent: WO9621880 (1996-07-01), None

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