What is the resistive touch screen?

The resistive touch screen is simply a sensor that uses the principle of pressure sensing to achieve touch.

When the human finger presses the touch screen surface, the elastic PET film will bend down, so that the upper and lower ITO coatings can contact each other to form a touch point, and the voltage at the point is detected by ADC to calculate the calculated X and Y axis coordinate values.Resistive touch screens usually use four, five, seven or eight wires to generate screen bias voltage and read back to the point.

Resistive touch screen advantages and disadvantages:

1. The resistive touch screen can only judge one touch point each time it works, and if the touch point is more than two, it cannot be correctly judged.

2. The resistive screen requires a protective film and relatively more frequent calibration, but the resistive touch screen is not affected by dust, water and dirt.

3. The ITO coating of the resistive touch screen is relatively thin and easy to break, and too thick will reduce light transmission and form internal reflection to reduce clarity, although ITO has added a thin plastic protective layer, it is still easy to be damaged by sharp objects: and because it is often touched, the surface ITO will have small cracks after use for a certain time, and even deformation. If the outer ITO of one of the points is damaged and broken, it loses its role as a conductor, and the life of the touch screen is not long.