1. Resistive touch screen
The most important part of a resistive touchscreen is a resistive thin-film screen that matches the surface of the display very well. This is a multi-layer composite film with a layer of glass or hard plastic plate as the substrate, the surface is coated with a transparent metal oxide (ITO indium oxide, transparent conductive resistance) conductive layer, and the top is covered with an outer surface hardened, smooth and wear-resistant plastic layer. Its inner surface is also coated with an ITO coating, and there are many fine layers (less than 11000 inches) between them. The transparent isolation point is responsible for separating and insulating the two conductive layers. When your fingers are actually touching the screen, the two conductive layers will come into contact at the point of contact. The controller detects the contact, calculates the position of (x,Y), and then operates it in a way that simulates the mouse. This is the most basic principle of resistive touch screens, and resistive touch screens are generally divided into four-wire resistive screens and five-wire resistive screens
1. The characteristics of the four-wire resistive screen: the relatively high resolution and high-speed transmission response surface are harded to reduce its scratches, scratches and chemical treatment
Smooth, misty finish
1. Calibration, high stability, never drift
When the upper two layers of transparent metal in the four-wire resistance simulation technique are operated, a constant voltage of 5V is added to each layer on average: one in the vertical direction and the other in the horizontal direction. A total of four cables are required
2. The characteristics of the five-wire resistance screen: high resolution and high-speed transmission response
Surface hardness treatment reduces scratches, scratches, and chemical treatments
Up to 30 million times at the same touchpoint, it can still be used
A medium based on conductive glass
1. Calibration, high stability, never drift
Five-wire resistive analog technology measures the position of the contacts by detecting the voltage and current by applying voltage in both directions to a metal layer close to the interior through a resistor network. The external ITO is only used as a conductor layer and requires a total of five cables
2. SAW technology touch screen
SAW technology uses sound waves to propagate across the surface of an object. When an object touches its surface, it hinders the propagation of sound waves, so sensors can detect this change, reflect it to a computer, and then simulate a mouse
The characteristics of SAW screen: high definition, good light transmittance
High durability and good scratch resistance
No drift correction
Quite responsive
It is suitable for government units and places with relatively clean offices and environments
The disadvantage of the surface acoustic wave screen is that it needs to be maintained frequently, because dust, oil and even beverage liquid pollute the surface of the screen, which will block the waveguide groove that affects the surface of the touch screen, so that the waveform can not be transmitted normally, or the waveform changes, so that the controller can not be identified normally, which will affect the normal use of the touch screen, and users need to pay strict attention to environmental hygiene. The surface of the screen must be wiped frequently to ensure the smoothness of the screen, and a full and thorough wipe must be performed regularly
3. Capacitive touch screen
Capacitive touch screens work using the human body's current induction. When the user touches the screen, a coupling capacitor is formed between the user and the touchscreen surface due to the electric field of the human body. For high-frequency currents, the capacitor is a direct conductor, so the finger absorbs a very small current from the point of contact. Current flows out of the electrodes at the four corners of the touchscreen, and the current flowing through the four electrodes is proportional to the distance from the finger to the corners. The controller then works by precisely calculating the proportions of the four currents of the capacitive touch screen
Characteristics get the location of the touch point: it is resistant to most environmental pollutants
The human body has become an important part of the line, so the drift phenomenon is more serious
Wearing gloves doesn't work at all
Frequent calibration is required
Not suitable for metal cabinets
When there is inductance and magnetic induction outside, the touch screen will fail.
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