touch screen lcd not working.The initial idea of ??the basic working principle of the external surface capacitive screen is : people are false grounding objects (zero potential body), and a very low voltage is applied to the working surface. When there is no contact with the screen, the various electrodes are at the same potential There is no current on the surface of the touch screen. When the user touches the screen , a small current is absorbed by the finger. This current flows from the electrodes on the four corners or four sides of the touch screen. The distance from the finger to the four corners is proportional. The controller calculates the position of the touch point through precise calculation of the four current ratios.

touch screen lcd not working.The initial idea of ??the basic working principle of the external surface capacitive screen is : people are false grounding objects (zero potential body), and a very low voltage is applied to the working surface. When there is no contact with the screen, the various electrodes are at the same potential There is no current on the surface of the touch screen. When the user touches the screen , a small current is absorbed by the finger. This current flows from the electrodes on the four corners or four sides of the touch screen. The distance from the finger to the four corners is proportional. The controller calculates the position of the touch point through precise calculation of the four current ratios. 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.