How does the infrared technology of smart boards achieve touch?
Smart board infrared technology realizes touch sensing by sensing infrared radiation from the human body. When a finger, pen or any object that can block light touches the display screen, it will block some light from penetrating. At this time, the infrared sensor on the smart board will track the blocked infrared radiation. By analyzing the strength and time of the infrared signal, the smart board can accurately identify the location and movement trajectory of the touch point, thereby realizing touch operation.
Infrared sensor
A number of infrared transmitting tubes are installed in the frame of the smart board to emit infrared rays in an array. The infrared rays pass through the display area of the smart board and form an infrared grid on the other side of the display area.
Infrared reception
There are also multiple infrared receiving tubes installed on the frame of the smart board, which receive infrared rays from the infrared transmitting tubes. When the user’s finger or stylus touches the surface of the smart board, part of the infrared rays will be blocked, thus achieving infrared reception.
Infrared touch process
1、The controller of the smart board sends instructions to all infrared emitting tubes, instructing them to emit infrared rays.
2、After being emitted, the infrared light passes through the display area of the smart board and forms an infrared grid on the other side of the display area.
3、When a user’s finger or stylus touches the surface of the smart board, some of the infrared light is blocked.
4、The controller of the smart board calculates the coordinates of the touch point based on the infrared intensity received by each infrared receiving tube.
5、The controller of the smart board sends the touch point coordinates to the application software, and the application software performs corresponding operations based on the touch point coordinates.
Application Scenario
Infrared touch technology is often used in scenarios that require interaction, such as education and meetings. Commonly used equipment includes smart blackboards for education, interactive whiteboards in conference rooms, etc.
