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Capacitive Touch Screen
Jan 25, 2019

The capacitive screen is operated by the current sensing of the human body., so any non-conductive objects such as fingernails cannot be recognized by the capacitive sensing system at the bottom of the screen.

Advantage

Capacitive touch screens only require touch and do not require pressure to generate a signal.

Capacitive touch screens require only one or no correction after production, while resistor technology requires routine correction.

The life of a capacitor solution can be longer because the components in the capacitive touch screen do not require any movement. In the resistive touch screen, the upper ITO film needs to be thin enough to be elastic so as to be bent downward to contact the underlying ITO film.

Capacitor technology is superior to resistor technology in terms of optical loss and system power consumption.

The choice of capacitor technology or resistance technology depends mainly on the object that touches the screen. If it is a finger touch, a capacitive touch screen is a better choice. If you need a stylus, whether it is plastic or metal, the resistive touch screen can do the job. A capacitive touch screen can also use a stylus, but a special stylus is required to match.

The surface capacitive type can be used for a large-sized touch screen, and the phase is also low, but the gesture recognition cannot be supported at present: the sensing capacitive type is mainly used for small and medium-sized touch screens, and can support gesture recognition.

Capacitive technology is resistant to wear and has a long life, and the maintenance cost is low when the user uses it, so the overall operating cost of the manufacturer can be further reduced.

Capacitive touch screens can support multi-touch technology, and unlike resistive touch screens, they are slow and not easy to wear.

TOUCHSCREEN
touch screen_副本

Disadvantage

The reflective screen of the capacitive screen is severe. Moreover, the four-layer composite touch screen of the capacitor technology has uneven transmittance for light of each wavelength, and there is a problem of color distortion. Due to the reflection of light between layers, the image characters are also blurred.

Current: The capacitive screen in principle uses the human body as an electrode of a capacitor element.

When the conductor is close to the interlayer ITO working surface and a sufficient amount of capacitance is coupled, the current flowing away is enough to cause the capacitive screen to malfunction.

Drift: The main disadvantage of the capacitive screen is drift: when the ambient temperature and humidity change, the environmental electric field changes, causing the drift of the capacitive screen, resulting in inaccuracy.



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