Host device display device and data transmission method thereof

A display device, comprising:

• a display unit, comprising a display connector for providing a display integrated information;
• a control unit coupled to the display connector for receiving the display integrated information;
• and
• a slave-end universal serial bus (USB) connector coupled to the display connector and the control unit and selectively connected to a host device, wherein when the integrated the slave-end connector is connected to the host device, the control unit provides a display-end response signal to the host device according to the display integrated information;
• wherein, the host device, in response to the display-end response signal, provides a display signal via the slave-end USB connector for driving the display unit to display the display signal.

An image data transmission method used in a host device comprising a host-end universal serial bus (USB) connector, a switch and a processing core, wherein the image data transmission method comprises:

• (a) determining by the processing core whether an external device is connected to the host-end USB connector;
• (b) determining by the processing core whether a USB protocol signal is received via the host-end USB connector when the external device is connected to the host-end USB connector;
• (c) determining the external device as a USB peripheral device by the processing core when the USB protocol signal can be received, and driving the switch to provide a USB signal to the host-end USB connector, so that the host device may exchange the USB signal with the USB peripheral device;
• (d) determining by the processing core whether a display-end response signal is received via the host-end USB connector when the USB protocol signal cannot be received;
• and
• (e) determining the external device as a display device by the processing core when the display-end response signal can be received, and driving the switch to provide a display signal to the host-end USB connector for driving the external device to display the display signal.