Patent ID: 9608435
Date: 2017-03-28
CPC Classifications: G06F,G09G,H02H,H03K

Claim:
1. An electronic device comprising: a motherboard comprising: a display configured to be electrically coupled to the connector; wherein the control unit is electrically coupled to a power supply, the first signal transmission unit comprises a first electronic switch, a second electronic switch and a first resistor, the first electronic switch comprises a first terminal, a second terminal and a third terminal, the second electronic switch comprises a first terminal, a second terminal and a third terminal, the first terminal of the first electronic switch is electrically coupled to the first terminal of the second electronic switch, and electrically coupled to the control unit, the second terminal of the first electronic switch is electrically coupled to the south bridge, the third terminal of the first electronic switch is electrically coupled to the third terminal of the second electronic switch, and electrically coupled to ground through the first resistor, and the second terminal of the second electronic switch is electrically coupled to the connector; wherein in event that the motherboard is powered off and the display is powered on, the power supply does not provide power to the control unit, the control unit outputs a first control signal to the first terminals of the first electronic switch and the second electronic switch, the first electronic switch and the second electronic switch are in pinch-off mode, and signals from the display are flowed into ground through the connector, the second terminal and the third terminal of the second electronic switch and the first resistor.