Composition of resistance touch screen
The main part of the resistance touch screen is a resistance film screen that fits well with the surface of the display. This is a multilayer composite film. It uses a layer of glass or hard plastic plate as the base layer, and the surface is coated with a layer of transparent oxide metal (transparent conductive resistance) conductive layer. The upper surface is covered with a layer of plastic layer with external surface hardening treatment, smooth anti friction, and its internal surface is also coated with a layer of coating There are many small (less than 1/1000 inch) transparent isolation points between them to separate the two conductive layers.
When the finger touches the screen, the two conductive layers will contact at the touch point, the resistance will change, and the signals will be generated in the X and Y directions, and then sent to the touch screen controller. The controller detects this contact and calculates the (X, Y) position. This is the basic principle of resistance technology touch screen. Many LCD modules use resistive touch screens, which can use four, five, seven, or eight wires to generate screen bias voltage and read back the voltage at the touch point.
Advantages of resistive touch screen:
1. The resistive touch screen has high accuracy, which can reach the level of pixel, and the applicable maximum resolution can reach 4096x4096.
2. The screen is not affected by dust, moisture and oil contamination, and can be used in low or high temperature environment.
3. The resistive touch screen uses pressure sensing, which can be touched with any object, even with gloves, and can be used for handwriting recognition.
4. The cost of resistive touch screen is relatively low due to its mature technology and low threshold.