1. Surface acoustic wave screen
The three corners of the acoustic screen are pasted with transducers that transmit and receive sound waves in the X and Y directions respectively (transducers: made of special ceramic materials, divided into transmitting transducers and receiving transducers. It is to convert the electrical signal sent by the controller through the touch screen cable into sound wave energy and the surface sound wave energy converged by the reflection fringes into electrical signals. ), the four sides are engraved with the reflection stripes of the ultrasonic waves of the reflective surface. When a finger or soft object touches the screen, part of the sound wave energy is absorbed, so the received signal is changed, and the X and Y coordinates of the touch are obtained through the processing of the controller.
2. Four-wire resistive screen
The four-wire resistive screen is covered with two transparent conductive layers ITO (ITO: indium oxide, weak conductive body) between the surface protective coating and the layer, and the characteristic is that when the thickness drops below 1800 angstroms (angstroms = 10-10 meters), it will suddenly become transparent, and then the light transmittance decreases when it is thin, and the light transmittance increases again when it reaches the thickness of 300 angstroms. It is the main material of all resistive screens and capacitive screens. The two layers correspond to the X and Y axes respectively, and the doors are insulated with fine transparent insulating particles, and the pressure generated when touching makes the two conductive layers turn on, and the X, Y coordinates of the touch are obtained due to the change of resistance value.
3. Five-wire resistive screen
The layer of the five-wire resistive screen is covered with a transparent conductive layer ITO that adds the voltage field in both directions of X and Y to the same layer, and the outermost nickel-gold conductive layer (nickel-gold conductive layer: only used as a pure conductor, when touching, the position of the contact point is measured by the method of detecting the voltage value of the X-axis and Y-axis of the contact point in time-sharing. The inner ITO requires four leads and one outer lead, for a total of 5 leads.
4. a capacitive screen
The surface of the capacitive screen is coated with a transparent conductive layer ITO, the voltage is connected to the four corners, and the tiny DC dispersion part is on the surface of the screen to form a uniform electric field.
This article comes from: International Industrial Automation Network
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