Resistive screen: Resistive touch screen part of the screen is a multi-layer composite film, by a layer of glass or plexiglass as the base layer, the surface coated with a layer of transparent conductive layer (ITO, film), and then covered with a layer of the outer surface after hardening , Smooth scratch-resistant plastic layer. Its inner surface is also coated with a layer of ITO, separated by a number of small (less than one thousandth of an inch) of the transparent barrier between the two layers of conductive layers. When the finger touches the screen, the two layers of ITO contact, the resistance changes, the controller according to the detected resistance changes to calculate the coordinates of the contact point, and then follow the coordinates of the corresponding operation, so this technology must be force To the screen in order to get the touch effect.
Capacitive screen: capacitive touch screen using the body’s current sensing to work, the touch screen consists of a four-layer composite glass screen. When the finger touches the touch screen, the user is connected to the surface of the touch screen to form a coupling capacitor. For high frequency current, the capacitor is a direct conductor, and the finger sucks a small current from the contact point. This current flows out of the electrodes on the four corners of the touch screen, respectively, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the position of the touch point by accurately calculating the four current ratios The
From the resistance screen and the principle of capacitive screen can be seen only need to touch the capacitive touch screen, without the need to generate a signal pressure. Capacitive touch screen in the production only once or no need to correct, and resistance technology requires routine correction. The life of the capacitive solution will be longer because the components in the capacitive touch screen do not need any movement. In the resistive touch screen, the upper ITO film needs to be thin enough to be resilient to bend down to the underlying ITO film.
Identify the touch screen is a resistive screen or capacitive screen method:
Look at
In the room, whether it is resistance screen or capacitive screen, both the visual effects are very good. But if put into the sun, the effect may be very different. The resistance screen performance will be unsatisfactory, because its additional screen level reflects a lot of sunlight. Such as Motorola “Ming” series of classic mobile phones, usually on the sun under the visibility of the naked eye.
Resistive touch screen need to use the pressure of the screen layer contact, you can use your fingers, stylus and other operations. Capacitive touch screen from the live finger surface of the most subtle contact can also activate the screen below the capacitive sensing system. Non-living body, nails and other invalid.
The fundamental characteristic of the resistive screen determines that its top is soft and needs to be able to press, which makes the screen very prone to scratches. But because the resistance screen can use the stylus or nail to operate, so the screen cleanliness is still quite good. The outside of the capacitive screen can use glass, so that although it is not indestructible, but may be broken under severe impact, but the glass should deal with daily rubbing and stains easier to handle.
4. purchase cost
Resistor screen cost is relatively low, the capacitive screen cost is relatively high. Which is why (excluding software interference) domestic Tablet PC price is lower than Apple iPad one of the major reasons.

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