Touch screen mobile phone capacitive touch screen and resistive touch screen are mainly different in touch sensitivity, accuracy, cost, multi-touch feasibility, damage resistance, cleaning, and sunlight visual effect.
Touch sensitivity, 1. Resistive touch screen: It is necessary to use pressure to make the layers of the screen contact, and you can use your fingers (even if you wear gloves), nails, stylus, etc. Stylus support is important in the Asian market, where gesture and text recognition are valued. 2. Capacitive touch screen: The slightest contact from the surface of the charged finger can also activate the capacitive sensing system under the screen. Non-living objects, fingernails, gloves are not effective. Handwriting recognition is more difficult.
Accuracy, 1. Resistive touch screen: the accuracy reaches at least a single display pixel, which can be seen when using a stylus. It facilitates handwriting recognition and facilitates operation in an interface using small control elements. 2. Capacitive touch screen: The theoretical accuracy can reach several pixels, but in practice it will be limited by the contact area of the fingers. So much so that it is difficult for users to accurately click on targets that are less than 1cm2.
Cost, 1. Resistance touch screen: very low. 2. Capacitive touch screen: The price of capacitive screens from different manufacturers is 10% to 50% more expensive than resistive screens. This extra cost doesn't matter to the flagship, but it can be prohibitive for mid-priced phones.
Multi-touch feasibility, 1. Resistive touch screen: impossible, unless the resistive screen is reassembled and connected to the circuit of the machine. 2. Capacitive touch screen: depending on the implementation method and software, it has been implemented on the technical demonstration of G1 and iPhone. The 1.7T version of the G1 already enables multi-touch in the browser.
Loss resistance, 1. Resistance touch screen: The fundamental characteristics of the resistance screen determine that its top is soft and needs to be able to press it. This makes the screen very susceptible to scratches. Resistive screens require a protective film as well as comparatively more frequent calibration. On the plus side, resistive touchscreen devices that use a plastic layer are generally less vulnerable to damage and less likely to break. 2. Capacitive touch screen: glass can be used on the outer layer. This way, although it is not indestructible and has the potential to shatter under severe impact, the glass is better coped with daily bumps and stains.
Cleaning, 1. Resistive touch screen: Since you can use a stylus or fingernail to operate, it is less likely to leave fingerprints, oil stains and bacteria on the screen. 2. Capacitive touch screen: It is necessary to touch it with the whole finger, but the outer layer of glass is easier to clean.
Environmental adaptability, 1. Resistance touch screen: the specific value is unknown. However, there is evidence that the Nokia 5800 with a resistive screen can work in temperatures ranging from -15°C to +45°C, with little humidity requirements. 2. Capacitive touch screen: The typical operating temperature is between 0° and 35°, and at least 5% humidity is required (limited by the working principle).
Sunlight Visualization, 1. Resistive Touchscreen: It's usually bad, and the extra screen layer reflects a lot of sunlight. 2. The capacitive touch screen uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen, the inner surface and the interlayer of the glass screen are each coated with a layer of ITO (coated conductive glass), the outermost layer is a thin layer of silica glass protective layer, ITO coating as the working surface, four electrodes are drawn out on the four corners, and the inner ITO is the shielding layer to ensure a good working environment.
When a finger touches a metal layer, the human electric field, the user, and the surface of the touchscreen form a coupling capacitance, which is a direct conductor for high-frequency currents, so the finger draws a small current from the contact point. This current flows from the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners, and the controller obtains the position information of the touch point by accurately calculating the proportion of these four currents.
Now, there are more capacitive screens because of its precise point placement and easier support for multi-touch and other advantages. But at the same time, it is also relatively delicate, so everyone needs to take care of it and maintain it well.
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