Switched column driver of display device

A column driver of a display device, comprising:

• an upper output buffer configured to be driven between a first voltage rail and a second voltage rail, and output a first output signal in response to a first input signal and a second input signal;
• a bottom output buffer configured to be driven between the second voltage rail and a third voltage rail, and output a second output signal in response to a third input signal and a fourth input signal;
• a first switch group configured to selectively provide the first to the fourth input signals for a first or a second input terminal of each of the upper output buffer and the bottom output buffer;
• a second switch group configured to feed back the first and the second output signals to the first or the second input terminal of each of the upper output buffer and the bottom output buffer;
• and
• a third switch group configured to selectively provide the first output signal and the second output signal to a first panel and a second panel, wherein the third switch group is configured to be driven only by the first voltage rail.