Abstract: An optical projection system includes a light source module, an optical engine, a thermoelectric generator, a storage unit, a plurality of electronic devices, and a selection unit. The light source module is capable of emitting at least one light beam, and the optical engine receives the light beam and modulates the light beam according to at least one image signal to form an image beam. The thermoelectric generator absorbs heat in the optical projection system and converts the heat into electrical energy, and the storage unit stores the electrical energy. The electronic devices receive the electrical energy stored in the storage unit and have at least two different threshold voltages. The selection unit selectively turns on at least one of electronic devices according to a state of charge of the storage unit.

Abstract: A Bluetooth device used for data transmission between first and second peripheral devices is provided. The Bluetooth device includes a processing circuit and a Bluetooth chip configured to be capable of being operated in a transmitting mode and a receiving mode for data transmitting and data receiving, respectively. In the transmitting mode, a first communication link is established between the Bluetooth chip and the first peripheral device through a first communication protocol. The processing circuit establishes a second communication protocol. In the receiving mode, a second communication link is established between the Bluetooth chip and the second peripheral device through a third communication protocol. The second peripheral device transmits a data to the Bluetooth chip through the second communication link and the Bluetooth chip transmits, based on the second communication protocol, the received data to the first peripheral device through the first communication link simultaneously.

Abstract: A Bluetooth device used for data transmission between first and second peripheral devices is provided. The Bluetooth device includes a processing circuit and a Bluetooth chip configured to be capable of being operated in a transmitting mode and a receiving mode for data transmitting and data receiving, respectively. In the transmitting mode, a first communication link is established between the Bluetooth chip and the first peripheral device through a first communication protocol. The processing circuit establishes a second communication protocol. In the receiving mode, a second communication link is established between the Bluetooth chip and the second peripheral device through a third communication protocol. The second peripheral device transmits a data to the Bluetooth chip through the second communication link and the Bluetooth chip transmits, based on the second communication protocol, the received data to the first peripheral device through the first communication link simultaneously.

Abstract: An optical projection system includes a light source module, an optical engine, a thermoelectric generator, a storage unit, a plurality of electronic devices, and a selection unit. The light source module is capable of emitting at least one light beam, and the optical engine receives the light beam and modulates the light beam according to at least one image signal to form an image beam. The thermoelectric generator absorbs heat in the optical projection system and converts the heat into electrical energy, and the storage unit stores the electrical energy. The electronic devices receive the electrical energy stored in the storage unit and have at least two different threshold voltages. The selection unit selectively turns on at least one of electronic devices according to a state of charge of the storage unit.