| 摘要 |
A display device ( 20 ) with USB connectivity connects with one or more USB devices ( 30 ) via one or more USB ports ( 207 ). The display device includes a power module ( 201 ), a display controller ( 202 ), a switching circuit ( 203 ), and an OR gate circuit ( 204 ). The display controller connects to a host ( 10 ), and is used to control the switching circuit according to a current status of the host. When the host is in a power-saving mode or a power off mode, the display controller controls the switching circuit to be on. Accordingly, the OR gate circuit electrically couples the power module to the USB ports. The display device thus powers the USB devices. If the host is in a normal mode, the display controller controls the switching circuit to be off. Accordingly, the OR gate circuit electrically couples the host to the USB ports. The host thus powers the USB devices.
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