touch screen lcd controller board.The light matrix frame is fixed on the front of the monitor, and the IR light penetrating phosphor screen is placed on top of the frame. This phosphor screen protects the optical components and prevents ambient light from saturating the phototransistor. The infrared controller turns on the LED diode and its opposite phototransistor in sequential order 25 times per second. Touching the screen interferes with the light beam, preventing it from reaching the phototransistor. The controller detects this light reduction phenomenon when the phototransistor is saturated horizontally or vertically, and processes this data into X and Y coordinates for the host.

touch screen lcd controller board.The light matrix frame is fixed on the front of the monitor, and the IR light penetrating phosphor screen is placed on top of the frame. This phosphor screen protects the optical components and prevents ambient light from saturating the phototransistor. The infrared controller turns on the LED diode and its opposite phototransistor in sequential order 25 times per second. Touching the screen interferes with the light beam, preventing it from reaching the phototransistor. The controller detects this light reduction phenomenon when the phototransistor is saturated horizontally or vertically, and processes this data into X and Y coordinates for the host. IQTouch K interactive touch screen feature 20-point touch and dual system -- Android 8.0 system and optional OPS Windows 10Pro system. Its 4K UHD resolution facilitates presentations and collaboration. With optional multi-screen casting software, IQClass 6.0 and installation-free IQClass Plus software, IQTouch K Series can help create an interactive and collaborative teaching atmosphere in class.