The contact screen of mobile phone capacitive contact screen and resistance contact screen are mainly different in contact sensitivity, accuracy, cost, multi-point contact feasibility, damage resistance, cleaning, and sunlight visibility.
Contact sensitivity, 1. Resistive touch screen: It is necessary to use pressure to make all layers of the screen contact, and can be operated with fingers (even with gloves), nails, stylus, etc. Stylus support is important in the Asian market, where gesture and text recognition are valued. 2. Capacitive touch screen: Thin 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 is more difficult to recognize.
Accuracy, 1. Resistive touch screen: the accuracy reaches at least a single display pixel, which can be seen when using the stylus. It is easy to read by hand, and it helps to operate in an interface with small control elements. 2. Capacitive touch screen: The theoretical accuracy can reach a few pixels, but in fact it will be limited by the contact area of the fingers. So much so that it is difficult for users to accurately click on the policy 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 rated cost doesn't matter to the flagship product, but it may discourage mid-priced phones.
Multi-point contact 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 completion method and software, it has been completed in the skill demonstration of G1 and on the iPhone. Version 1.7T of G1 is already able to complete the multi-point contact feature of the browser.
Loss resistance, 1. Resistance touch screen: The base characteristics of the resistance screen determine that its top is soft, and the demand can be pressed. This makes it very easy to scratch the screen. Resistive screens require a protective film as well as a comparatively more frequent calibration. On the plus side, resistive touchscreen devices with plastic layers are generally less vulnerable to damage and less likely to break. 2. Capacitive touch screen: glass can be used for 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: Because it can be operated with a stylus or fingernail, it is not easy to leave fingerprints, oil stains and bacteria on the screen. 2. Capacitive touch screen: use the whole finger to touch, 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 is capable of operating at temperatures between -15°C and +45°C, with little humidity required. 2. Capacitive touch screen: the typical operating temperature is between 0° and 35°, and at least 5% humidity is required (limited by the operating principle).
Sunlight visibility, 1. Resistive touch screen: Usually very bad, the rated screen level reflects a lot of sunlight. 2. The capacitive touch screen uses the current induction of the human body to operate. The capacitive touch screen is a four-layer composite glass screen, the inner and outer surface of the glass screen and the interlayer are each coated with a layer of ITO (coated conductive glass), * the outer layer is a thin layer of silica glass protective layer, ITO coating as the working surface, four electrodes are drawn from the four corners, and the inner ITO is the shielding layer to ensure an outstanding working environment.
When the finger touches the metal layer, the electric field of the human body, 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 amount of current from the contact point. This current flows from the electrodes on the four corners of the touchscreen, and the current flowing through these four electrodes is proportional to the interval between the finger and the four corners, and the controller accurately calculates the position of the contact points through the accurate calculation of the four current shares.
Now, there are more and more capacitive screens, because of its accurate point, the easier it is to support multi-touch and other advantages. But together it is also relatively delicate, so everyone needs to cherish it and maintain it well.
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