touch screen display resistive.The problem is solved, but the cost is high: the first is " drift " , because the coupling capacitor is unstable. It is directly affected by temperature, humidity, finger wetness, human body weight, and dryness of the ground, and it is affected by a large area of ??the outside world. The interference of the object is also very large, which brings unstable results. These directly violate the basic requirements of the absolute coordinate system as a touch screen, which inevitably generates drift. Some capacitive touch screens want to pass the 25- point calibration method or even 96. The point calibration method to solve the drift problem is actually impossible. The drift is determined by the capacitor operation. Even using dynamic calculation and empirical value look-up tables on the controller's single-chip computer program, it can only cure the symptoms and not the root causes. . The multi-point calibration method was the earliest method used by large-screen projection touch panels. The purpose is to eliminate the linear distortion corresponding to the coordinates. The linear distortion of the capacitive touch screen is also very strong, mainly because the calculation of the capacitive screen is based on the four current levels and the touch point. In the ideal state where the distance between the four electrodes is proportional, due to the influence of environmental capacitance, line parasitic capacitance, and use by different people, this proportional relationship cannot be completely linear. The multi-point calibration method can only solve the linearity of local distribution. The problem cannot solve the overall drift.

touch screen display resistive.The problem is solved, but the cost is high: the first is " drift " , because the coupling capacitor is unstable. It is directly affected by temperature, humidity, finger wetness, human body weight, and dryness of the ground, and it is affected by a large area of ??the outside world. The interference of the object is also very large, which brings unstable results. These directly violate the basic requirements of the absolute coordinate system as a touch screen, which inevitably generates drift. Some capacitive touch screens want to pass the 25- point calibration method or even 96. The point calibration method to solve the drift problem is actually impossible. The drift is determined by the capacitor operation. Even using dynamic calculation and empirical value look-up tables on the controller's single-chip computer program, it can only cure the symptoms and not the root causes. . The multi-point calibration method was the earliest method used by large-screen projection touch panels. The purpose is to eliminate the linear distortion corresponding to the coordinates. The linear distortion of the capacitive touch screen is also very strong, mainly because the calculation of the capacitive screen is based on the four current levels and the touch point. In the ideal state where the distance between the four electrodes is proportional, due to the influence of environmental capacitance, line parasitic capacitance, and use by different people, this proportional relationship cannot be completely linear. The multi-point calibration method can only solve the linearity of local distribution. The problem cannot solve the overall drift. 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.