Accuracy, 1, resistance touch screen: the accuracy of at least a single display pixel, can be seen with the stylus. It is easy to recognize by hand and helps to operate under the interface of small control elements. 2, capacitive touch screen: the theoretical accuracy can reach several pixels, but in fact will be limited by the finger contact area. It is difficult for the user to accurately click on a target of less than 1 cm 2 .
Cost, 1, resistance touch screen: very low. 2, capacitive touch screen: different manufacturers of capacitive screen price is 10% to 50% more expensive than the resistance screen. This extra cost doesn't matter to the flagship product, but it may discourage mid-priced phones.
Multi-touch feasibility, 1, resistive touch screen: impossible, unless the restructured resistive screen is connected to the machine's circuit. 2, capacitive touch screen: depending on the implementation and software, has been implemented in the G1 technical demonstration and iPhone. The 1.7T version of the G1 is already capable of implementing the multi-touch feature of the browser.
Damage resistance, 1, resistance touch screen: The fundamental characteristics of the resistance screen determine that the top of it is soft and needs to be able to press down. This makes the screen very susceptible to scratches. Resistive screens require a protective film and relatively more frequent calibration. An advantageous aspect is that the resistive touch screen device using the plastic layer is generally less susceptible to damage and less prone to breakage. 2, capacitive touch screen: the outer layer can use glass. Although it is not indestructible, and it may break under severe impact, the glass should be better for daily rubbing and smudges.
Clean, 1, resistive touch screen: Because you can use the stylus or nail to operate, it is not easy to leave fingerprints, grease and bacteria on the screen. 2, capacitive touch screen: to use the entire finger to touch, but the outer layer of glass is easier to clean.
Environmental adaptability, 1, resistance touch screen: the specific value is not known. However, there is evidence that the Nokia 5800 with a resistive screen can operate at temperatures between -15 ° C and +45 ° C without any humidity requirements. 2. Capacitive touch screen: The typical operating temperature is between 0° and 35°, requiring at least 5% humidity (limited by working principle).
Visible in the sun, 1, resistive touch screen: usually very bad, the extra screen level reflects a lot of sunlight. 2. The capacitive touch screen uses the current sensing 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 coated with a layer of ITO (coated conductive glass), the outermost layer is a thin layer of bauxite glass protective layer, and the ITO coating is used as the working surface. Four electrodes are led out at the four corners, and the inner layer of ITO is a shielding layer to ensure a good working environment.
When the finger touches the metal layer, the human body electric field, the user and the surface of the touch screen form a coupling capacitor. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a small current from the contact point. This current flows out from the electrodes on the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the touch point by accurately calculating the ratio of the four currents. location information.
Nowadays, the use of capacitive screens is a little more, because it is accurate and more convenient to support multi-touch. But at the same time it is also more delicate, so you need to take good care of it and take good care of it.