Summary of working principle of resistive and capacitive touch screen
Date:2019-08-01
When selecting the type of industrial LCD screen, we often encounter a problem that is touch function. At present, there are few industrial LCD screens with touch integration in the market, almost all of them are separate LCD modules. To bring touch, we need external touch screen. The touch screen can be divided into capacitive touch screen and resistive touch screen, and some even have infrared touch screen. In the face of so many choices of touch screen, how should we choose industrial LCD with touch screen? Now we will introduce the working principle of common resistive touch screen and capacitive touch screen. You understand the working principle and make corresponding choices.
Working principle of resistive touch screen:
Whether it is a 4-wire resistive touch screen or a 5-wire resistive touch screen, the working principle is the same. The working principle of the resistive touch screen is mainly to realize the operation and control of the screen content through the pressure sensing principle. The body part of the touch screen is a multilayer composite film which is very compatible with the surface of the display. The first layer is the bottom layer of glass or plexiglass, the second layer is the partition layer, and the third layer is the surface layer of multi resin. The surface is also coated with a transparent conductive layer, The top is covered with a plastic layer whose outer surface is hardened, smooth and scratch resistant. The conductive layer and the glass layer on the surface of the multi-component resin are separated by many tiny partitions; The current passes through the surface layer. When the surface layer is pressed down, it contacts the bottom layer. The controller reads the corresponding current from four corners and calculates the distance of finger position. The touch screen consists of two highly transparent conductive layers. The distance between the two layers is only 2.5 microns. When the finger touches the screen, the two insulating conductive layers have a contact at the touch po
Our company can supply AMT resistive touch screen, gtouch capacitive touch screen and some domestic capacitive touch screen, which can be used with 3.5-32 inch Industrial LCD screen.
