Coretronic Corporation

Chih-Hsiang Li

Jui-Ta Liu

Chun-Chieh Wang

I-Ming Liu

Chien-Yi Yang

Chien-Hsu Lin

Hsuan-Hsiang Fu

Yu-Chun Chen

Juita Liu

The disclosure provides a method and a projection device for focal length calibration. The projection device includes a distance sensor, a projection lens, and a controller. The method includes: defining, by the distance sensor, a detection area on a projection surface; dividing, by the controller, the detection area into a plurality of reference areas; detecting, by the distance sensor, a reference distance between the projection device and each reference area; finding, by the controller, at least one first area and at least one second area in the reference areas; and performing, by the controller, a focusing operation of the projection lens only based on the reference distance of each second area.

Focal length calibration method and projection device

A projection apparatus is provided, which includes a projector body, a first ultrasonic sensor and a second ultrasonic sensor. The projection apparatus is configured to project an image onto a screen. The first ultrasonic sensor and the second ultrasonic sensor are disposed on the projector body. The first ultrasonic sensor and the second ultrasonic sensor are respectively configured to measure a distance between the projector body and the screen. The projector body corrects the image in a horizontal direction through the first ultrasonic sensor and the second ultrasonic according to the measured distances. The first ultrasonic sensor and the second ultrasonic sensor are disposed on a first reference line corresponding to the first direction. The projection apparatus of the invention may provide good image quality.

Projection apparatus

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.

Bluetooth device, projection device and data transmission method

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Hsin-Chu, Taiwan

Chih-Hsiang Li