This technology is widely used in notebook computers. For example, the "touchpad" is the principle of capacitance induction.
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Capacitive touch screen works through current induction of human body. Capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are coated with ITO (coated conductive glass), and the outermost layer is a thin protective layer of Shi Ying glass. ITO coating is used as working surface, and four electrodes are drawn out at four corners. The inner ITO layer is a shielding layer to ensure a good working environment. When the finger touches the metal layer, the human electric field, the user and the touch screen surface form a coupling capacitance. For high frequency current, the capacitor is a direct conductor, so the finger draws a small current from the contact point. This current flows from the electrodes at 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. The controller obtains the position information of the touch point through the accurate calculation of these four current ratios.
The battery capacity of iphone is still quite large. We have three iphone at home. You have many mobile phones, so do my parents. If the iphone is only used to answer the phone, the standby time is still very long. My dad usually only answers the phone and charges once, which can last for 3 or 4 days. But if I play games with it, it will only take three or four hours.
And what comes out of apples now is no longer a commodity. They are regarded as works of art ... Iphone, a work of art that combines the world's top technology, has many peripheral products. Although the iphone can't change the spare battery. However, it has products with external batteries. It is also more than 1000 mA, which is also a good thing.
If you must find a touch screen with the same performance, I have used many touch-screen mobile phones, and any brand of touch screen can't surpass Apple. However, apart from the iphone, the better touch screen can only be the mobile phone with Android system, such as htc, and the two models and systems produced by Motorola this year are all good, and it is also good to support the domestic m9. It is the same type of touch screen as Apple. But certainly not as flexible as the iphone. I have used them all.