The capacitive touch screen is to paste a layer of transparent special metal conductive substance on the surface of the glass. When a finger touches this metal layer, the capacitance of the contact will change, causing the frequency of the oscillator connected to it to change. By measuring the frequency change, the touch position can be determined to obtain information. Since the capacitance changes with temperature, humidity or grounding conditions, its stability is poor and it tends to drift.
Resistive touch screen is a kind of sensor, the structure of film and glass, the adjacent side of film and glass are coated with ITO (nano indium tin oxide) coating, ITO has good conductivity and transparency. When touch operation, the ITO on the lower layer of the film will touch the ITO on the upper layer of the glass, and the corresponding electrical signal will be transmitted through the sensor, sent to the processor through the conversion circuit, and converted into the X and Y values on the screen through calculation, and the point is completed. The selected action is displayed on the display.
The difference:
1. Touch sensitivity
Capacitive screens work by using the current induction of the human body, so any non-conductive objects such as fingernails, gloves, etc. cannot be recognized by the capacitive sensing system under the screen; resistive screens work by pressure sensing, and can be touched by any object. Stylus support.
2. Feasibility of multi-touch
The multi-touch of capacitive screen can be realized, depending on the way of realization and the software used; while the multi-touch of resistive screen cannot be realized unless the resistive screen is reassembled and connected to the circuit of the machine.
3. Damage resistance
The outermost layer of the capacitive screen is a protective layer of silica glass, which may be broken under severe impact; while the outermost layer of the resistive screen is a thin film, which needs to be pressed down to achieve pressure sensing, and the resistive screen Supports the stylus, which makes the screen prone to scratches, requires a protective film and relatively more frequent calibration, but is less prone to breakage than capacitive screens.
4. Accuracy
Capacitive screens can theoretically reach a few pixels, but in fact, due to the limitation of the finger contact area, it is difficult for users to accurately click on targets smaller than 1cm; while the accuracy of resistive screens reaches at least a single display pixel, which can be seen when using a stylus . Facilitates handwriting recognition and facilitates navigating the interface using small control elements.
5. Visual effects
Both capacitive and resistive screens look good indoors, but outdoors, especially under sunlight, show differences. Capacitive screens are better, but resistive screens are less visible because of the extra screen layer that reflects sunlight.
6. Cleanliness
Capacitive screens need to be touched with fingers, which is easy to leave stains on the screen, but because the outermost layer is glass, it is easier to clean; while resistive screens can be operated with a stylus or fingernails, so it is not easy to stain the screen.
7. Environmental adaptability
The typical operating temperature of the capacitive screen is between 0° and 35°, and requires at least 5% humidity; while the operating temperature of the resistive screen has no specific value, but it has been confirmed that the resistive screen used in the Nokia 5800 can operate at -15°C to +45°C It can work normally at a temperature of °C, and the resistive screen has no requirements for humidity.
8. Cost
Capacitive screens are more expensive, and capacitive screens from different manufacturers are about 10% to 50% more expensive than resistive screens; while resistive screens are relatively cheap, and some counterfeit phones currently on the market are mostly resistive screens.
9. Power consumption
Capacitive screens consume more power than resistive screens.
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