Circuit providing common voltage for panel of display

Details Circuit providing common voltage for panel of display Circuit providing common voltage for panel of display

2007-11-08

2011-11-08

Nguyen, Kimnhung (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S098000, C323S311000, C327S560000

Reexamination Certificate

active

08054306

ABSTRACT:
A circuit providing a common voltage for a panel of a display includes a first operational amplifier, a second operational amplifier, a third operational amplifier, a capacitor and a switch circuit. The first operational amplifier outputs a first voltage. The second operational amplifier is powered by the first voltage and receives a polarity signal to output a second voltage. The third operational amplifier outputs a third voltage. The capacitor has a first end coupled to an output of the second operational amplifier and a second end coupled to an output of the third operational amplifier. The switch circuit couples the second end of the capacitor to the panel during a normal operation of the display, and couples one of a high constant voltage and a low constant voltage to the panel during a power saving operation of the display.

REFERENCES:
patent: 6600466 (2003-07-01), Rosenquist
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patent: 7551024 (2009-06-01), Sutardja
patent: 7812805 (2010-10-01), Miura
patent: 2005/0195149 (2005-09-01), Ito
patent: 2008/0150930 (2008-06-01), Nam et al.

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