Voltage regulating circuit, voltage regulating method and display device

A display device, comprising:

• a display circuit, comprising a driver and at least a pixel unit;
• and
• a voltage regulating circuit, comprising:
• an impedance circuit comprising a first node and a second node, wherein the second node is electrically coupled to the display circuit through an impedance element;
• a control unit electrically coupled to the first node, and configured to control a first voltage value of the first node according to a control signal;
• and
• a power supply circuit, an input terminal of the power supply circuit electrically coupled to the second node, an output terminal of the power supply circuit electrically coupled to the display circuit, wherein the power supply circuit is configured to output a control voltage to the display circuit according to a second voltage value of the second node.

A voltage regulating method, comprising:

• adjusting a first voltage value of a first node in an impedance circuit according to a control signal, wherein the impedance circuit comprises a plurality of resistors, the first node and a second node, and the second node is electrically coupled to a power supply circuit and a display circuit;
• outputting a control voltage to the display circuit through the power supply circuit according to a second voltage value of the second node;
• and
• driving at least a pixel unit through the display circuit according to the control voltage to adjust a grayscale value of the at least pixel unit.