Display controller with multiple common voltages corresponding to multiple refresh rates

A liquid crystal display system, comprising:

• a liquid crystal display panel;
• a source driver circuit coupled to the liquid crystal display panel;
• a gate driver circuit coupled to the liquid crystal display panel;
• a display connector;
• a back light disposed adjacent to the liquid crystal display panel;
• a back light driver circuit coupled between the display connector and the back light;
• a timing control circuit coupled between the display connector and the source driver circuit, the timing control circuit to set a frame rate of the liquid crystal display panel to one of at least a first frame rate and a second frame rate in accordance with an operation mode;
• and
• a power control circuit coupled between the display connector and the gate driver circuit, the power control circuit to set a reference voltage of the liquid crystal display panel to one of at least a first reference voltage and a second reference voltage in accordance with the operation mode,
• wherein the first reference voltage corresponds to a first pre-determined voltage for the first frame rate and the second reference voltage corresponds to a second pre-determined voltage for the second frame rate.

A processing system comprising;

• a processor;
• a display coupled to the processor;
• and
• a display controller coupled to the display,
• wherein the display controller includes a frame rate circuit to change a frame rate of a display from a first frame rate to a second frame rate, and a reference voltage circuit to adjust a reference voltage of the display from a first reference voltage corresponding to the first frame rate to a second reference voltage corresponding to the second frame rate.