Electronic device having expansion interface

摘要

An electronic device having an expansion interface includes a shell, a button, a circuit board, switch and a voltage adjusting unit. The shell defines a through hole. The button is movably received in the through hole. The button includes a first electroluminescent portion and a second electroluminescent portion. The switch is electrically connected to the circuit board and is activated by the button to control whether to load a same voltage to the first electroluminescent portion and a second electroluminescent portion to drive them to emit light of equal brightness. The voltage adjusting unit changes the voltage loaded to the second electroluminescent portion to drive the second electroluminescent portion to emit light having a different brightness from the light emitted from the first electroluminescent portion when an expansion device is connected to the expansion interface.

主权项

1. An electronic device having an expansion interface, the electronic device comprising:
a shell defining a through hole; a button movably received in the through hole, the button comprising a first electroluminescent portion and a second electroluminescent portion; a circuit board; a switch electrically connected to the circuit board and configured to be activated by the button, wherein the switch controls whether to transmit a same voltage to the first electroluminescent portion and a second electroluminescent portion to drive them to emit light of equal brightness; and a voltage adjusting unit configured to change the voltage transmitted to the second electroluminescent portion to drive the second electroluminescent portion to emit light having a different brightness from the light emitted from the first electroluminescent portion when an expansion device is successfully connected to the expansion interface.