Circuit providing common voltage for panel of display
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.
Himax Technologies Limited
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Chin-Chan Cheng-Lung
Chang Chiang