Bluetooth device, projection device and data transmission method

A data transmission method of a Bluetooth device for transmitting data between a plurality of peripheral devices including a first peripheral device and a second peripheral device, the data transmission method comprising:

• searching the plurality of peripheral devices and selecting the first peripheral device from a searching list;
• issuing a first link request to the first peripheral device;
• receiving a first link confirmation responding from the first peripheral device thereby establishing a first communication link between the Bluetooth device and the first peripheral device through a first communication protocol;
• establishing a second communication protocol;
• receiving a second link request issued from a second peripheral device;
• responding a second link confirmation to the second peripheral device thereby establishing a second communication link between the Bluetooth device and the second peripheral device through a third communication protocol;
• and
• receiving a data transmitted from the second peripheral device through the second communication link, linking the first and second communication links through the second communication protocol, and simultaneously transmitting the received data to the first peripheral device through the first communication link.

A projector device, comprising:

• an optical projection device;
• and
• a Bluetooth device, electrically coupled to the optical projection device, used for data transmission between a plurality of peripheral devices including a first peripheral device and a second peripheral device, the Bluetooth device comprising a processing circuit and a Bluetooth chip, the Bluetooth chip being electrically connected to the processing circuit and configured to be capable of being operated in a transmitting mode and a receiving mode for data transmitting and data receiving, respectively,
• wherein when the Bluetooth chip is operated in the transmitting mode through a control of the processing circuit, a first communication link is established between the Bluetooth chip and the first peripheral device through a first communication protocol,
• wherein the processing circuit is configured to establish a second communication protocol and the second communication protocol allows the Bluetooth chip operated in the receiving mode to perform a data synchronous transmission,
• wherein when the Bluetooth chip is operated in the receiving mode through a control of the processing circuit, a second communication link is established between the Bluetooth chip and the second peripheral device through a third communication protocol,
• wherein the second peripheral device transmits a data to the Bluetooth chip through the second communication link and the Bluetooth chip transmits, under a permission of the second communication protocol, the received data to the first peripheral device through the first communication link simultaneously.