Many of the electronic products used by everyone are using resistive touch screens, which is the popular trend of electronic products in the future. Next, Tianxianwei Technology will introduce to you what is a resistive touch screen and what is the working principle of the resistive touch screen?
HD resistive touch screen
Resistive touch screen
Resistive touch screen is a sensor that converts the physical position of the touch point (X, Y) in a rectangular area into voltages representing X and Y coordinates. Many LCD modules use resistive touch screens. According to the Electronics House, this screen can use four, five, seven or eight lines to generate screen bias voltage and read back the voltage at the touch point.
Resistive touch screen
The working principle of resistive touch screen
The working principle of the resistive touch screen is mainly through the principle of pressure sensing to realize the operation and control of the screen content. The screen body of this touch screen is a multi-layer composite film that matches the surface of the display. The first layer is glass or plexiglass. The bottom layer, the second layer is the barrier layer, and the third layer is the surface layer of multi-element resin. The surface is also coated with a transparent conductive layer, and the surface is covered with a hardened, smooth and scratch-resistant plastic layer. The conductive layer and glass layer sensor on the surface of the multi-element resin is separated by many tiny interlayers. The current passes through the surface layer. When the surface layer is touched lightly, it touches the bottom layer. The controller reads out the corresponding current and current from the four corners at the same time. Calculate the distance of the finger position.
This kind of touch screen uses two highly transparent conductive layers to form the touch screen, and the distance between the two layers is only 2.5 microns. When a finger touches the screen, the two conductive layers that are usually insulated from each other make a contact at the touch point. Because one conductive layer is connected to a 5V uniform voltage field in the Y-axis direction, the voltage of the detection layer changes from zero to zero. Non-zero, after the controller detects this is turned on, it performs A/D conversion and compares the voltage value obtained with 5V to obtain the Y-axis coordinate of the touch point. Similarly, the X-axis coordinate can be obtained. It is the most basic principle common to all resistive technology touch screens.
After reading the above introduction, you must already know what a resistive touch screen is. Now resistive touch screens have been widely used in computers, mobile phones and other products.
