Common feeling screen has two kinds big, cent touchs screen and screen of capacitance technology feeling for resistor technology. Namely the resistor screen that big the daily life of a family says and capacitance screen. Screen of each kinds of feeling has its respective actor drawback, not absolutely the cent of the actor bad of the ground.
Resistor screen is commonner on the functional mobile phone 5 years ago, the body of resistor feeling screen is together as special as monitor surface the resistor film screen that cooperate. Substantially, this is a kind of multilayer compound film, it with a glass or hard plastic tablet serves as basic level, the metal that exterior besmear has a transparent oxidation (ITO oxidation indium, transparent electric resistor) electric layer, the plastic layer that there is sclerosis of an outside face to handle in the lid above it, and the surface inside its also coating of ITO of Tu Youyi layer, there are a lot of transparent segregations to nod a layer of two electric conduction to separate insulation between them.
Most principle respect of the foundation, when our finger touchs screen, these two electric layers nodded the position to have a contact in feeling, make thereby controller diagnoses this one contact to nod, calculate give a dot to hit the place in screen, run according to the means of imitate mouse again.
A lot of mobile phones deploy to touch accuse a pen, the head of that pen can be any solid material pledge, the commonnest is plastic, it needs to be pressed on screen forcibly, will realize fixed position through applying force to change resistor.
And now almost what all smartphones use is capacitance screen, this kind of screen uses the voltaic induction of human body to have the job.
When the user touchs screen, as a result of human body electric field, user and feeling screen appearance are formed with capacitance of a coupling, principle respect, for high frequency to this kind electric current, capacitance is direct conductor, then finger sucks a very small charge from osculatory dot.
According to charge voltage principle, cent of this electric current goes out from the goes up quadrilateral electrode midstream of screen, the distance that and flow points to 4 horn via the electric current of these 4 electrode and hand becomes direct ratio, screen controller passes proportional to these 4 electric current mathematical calculation, the position that reachs feeling is nodded thereby.
Also because of this, when our finger surface has water, make screen appearance easily big phenomenon of area occurrence electric current, controller is imponderable the osculatory point that gives accurate finger, because, look in it, water drinks the person's finger to do not have any differences, can form electric current. This thing can appear touch the appearance that controls drift, screen is not acute also.
