touch screen display types.Touch screens consist of two transparent layers stacked on top of each other. Four- and eight-wire touch screens consist of two layers of transparent resistive materials with the same surface resistance. Five- and seven-wire touch screens consist of a resistive layer and a conductive layer. Use an elastic material to separate the two layers. When the pressure on the surface of the touch screen ( such as pressing with a pen tip or a finger ) is large enough, contact occurs between the top layer and the bottom layer. All resistive touch screens use the voltage divider principle to generate voltages that represent X and Y coordinates. As shown in Figure 3 , the voltage divider is implemented by connecting two resistors in series. The upper resistor (R1) is connected to the positive reference voltage (VREF) , and the lower resistor (R2) is connected to ground. The voltage measurement at the connection point of the two resistors is directly proportional to the resistance of the resistor below.

touch screen display types.Touch screens consist of two transparent layers stacked on top of each other. Four- and eight-wire touch screens consist of two layers of transparent resistive materials with the same surface resistance. Five- and seven-wire touch screens consist of a resistive layer and a conductive layer. Use an elastic material to separate the two layers. When the pressure on the surface of the touch screen ( such as pressing with a pen tip or a finger ) is large enough, contact occurs between the top layer and the bottom layer. All resistive touch screens use the voltage divider principle to generate voltages that represent X and Y coordinates. As shown in Figure 3 , the voltage divider is implemented by connecting two resistors in series. The upper resistor (R1) is connected to the positive reference voltage (VREF) , and the lower resistor (R2) is connected to ground. The voltage measurement at the connection point of the two resistors is directly proportional to the resistance of the resistor below. 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.