Patent ID: 8624518

Claim:
A power management circuit, comprising: a power-on signal input configured to receive a power-on signal; an output terminal configured to provide the power-on signal to a load, the output terminal grounded via a discharge unit; a switching unit electrically connected between the power-on signal input and the output terminal, the switching unit comprising a first transistor and a first resistor, the first transistor comprising a control terminal, a first conducting terminal and a second conducting terminal; the power-on signal input connected to the first conducting terminal of the first transistor, and the power-on signal input connected to the control terminal of the first transistor via the first resistor; a control signal input configured to receive a control signal; and a control unit electrically connected to the control signal input, the control unit configured to selectively turn on the switching unit to output the power-on signal to a display module via the output terminal and selectively turn off the switching unit to cut off an electrical connection between the power-on signal input and the output terminal, the discharge unit configured to discharge residual electrical charges in the display module when the switching unit is turned off.