A power circuit for a display device, comprising a control unit, a first power unit, a second power unit, and a third power unit; the input terminal of the first power unit, the input terminal of the second power unit and the input terminal of the third power unit are electrically connected and are used to input the power voltage; the control terminal of the first power unit is electrically connected to the control unit, the output terminal of the first power unit provides a first voltage; the control terminal of the second power unit is electrically connected to the control unit, the output terminal of the second power unit provides a second voltage; the control terminal of the third power unit is electrically connected to the control unit, and the output terminal of the third power unit provides a third voltage.