e-ink touch screen display.The early external surface capacitive touch screen itself was actually a set of precise leakage sensors. Hands with gloves could not be touched. Due to the use of capacitive methods, there was a drift phenomenon. The outer surface of the capacitive screen and electrical resistive screens are electrical schematic of work, electrical work for multi-touch, no matter how many points, but also whether it is continuous or discontinuous are taking multi-center point of the touch judge, because the current There is no way to distinguish who is who. Going according to the basic principles, I encountered insurmountable obstacles: because the transparent conductive material ITO layer is very fragile, it is easy to be damaged by direct touch , so it cannot be used directly as a working layer. The problem of the material was difficult to solve for a while, so I had to add a very thin layer of hard glass on the outside. It was obviously unable to conduct electricity. DC was not working. We could only use high-frequency AC signals. ) The coupling capacitor formed with the working surface to draw an AC current, this is the origin of the "capacitance" name of the capacitive screen . The problem is solved, but paid the price also is great.

e-ink touch screen display.The early external surface capacitive touch screen itself was actually a set of precise leakage sensors. Hands with gloves could not be touched. Due to the use of capacitive methods, there was a drift phenomenon. The outer surface of the capacitive screen and electrical resistive screens are electrical schematic of work, electrical work for multi-touch, no matter how many points, but also whether it is continuous or discontinuous are taking multi-center point of the touch judge, because the current There is no way to distinguish who is who. Going according to the basic principles, I encountered insurmountable obstacles: because the transparent conductive material ITO layer is very fragile, it is easy to be damaged by direct touch , so it cannot be used directly as a working layer. The problem of the material was difficult to solve for a while, so I had to add a very thin layer of hard glass on the outside. It was obviously unable to conduct electricity. DC was not working. We could only use high-frequency AC signals. ) The coupling capacitor formed with the working surface to draw an AC current, this is the origin of the "capacitance" name of the capacitive screen . The problem is solved, but paid the price also is great. 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.