Screen of capacitance mood feeling is the electric flu that arises through human body actually answer and have the job, resembling the mobile phone that we use having one share is screen of capacitance mood feeling, the working principle that capacitance type shares to touch screen to everybody below is what kind of.
 

 

 

Capacitance type touchs screen

 

The working principle of screen of capacitance mood feeling is what kind of

 

Principle overview

 

Capacitance screen should realize much dot to touch accuse, increase the electrode of each other capacitance what lean namely, say simply, divide screen namely piece, module of capacitance of a group of each other is being installed in each area is substantive work, so capacitance screen can detect independently of each area touch accuse a circumstance, after undertaking handling, simple implementation is touched at many o’clock accuse.

 

The voltaic response that uses human body undertakes CTP(Capacity Touch Panel) of face plate of capacitance technology feeling working. Capacitance screen is a screen of 4 compound glass, of vitreous screen inside the surface and interlining besmear Sikkim of indium of rice of an ITO(accept belongs to oxide) each, the outerest it is the covering layer of silicon earth glass with only thick 0.0015mm, interlining ITO coating makes working face, 4 horn are derivative 4 electrode, lining ITO works with assuring for screen layer environment.

 

When the user touchs capacitance screen, as a result of human body electric field, user finger and working face form capacitance of a coupling, because be received on working surface,have high frequency signal, then finger absorbs a very small electric current, this electric current is poured out of in the electrode that goes up from 4 horn of screen respectively, and the electric current of 4 electrode and finger go to academic and genteel classics quadrilateral the distance becomes scale, controller passes proportional to 4 electric current accurate computation, reach the position. Can reach the definition of 99% , have those who be less than 3ms to answer speed.

 

Face plate of projectile style electric capacity

 

Of face plate of projectile style electric capacity touch accusing a technology to project capacitance type touchs screen is etch on coating of glass of two ITO electric conduction a different ITO is electric circuit module. The graph that etchs on two module is mutual and perpendicular, can regarding them is X and Y direction what change continuously is slippery. Be in as a result of framework of X, Y different face, its intersect place form one capacitance node. One slips can regard as drive line, another slips regarding as is detect line. When a lead in passing drive line when electric current, if the outside has the signal that capacitance changes, can cause the change of node of the capacitance on another lead so. The change that senses capacitance value can pass the electronic loop that is linked together to it to measure get, again by A/D controller turns to let the computer do operation processing to obtain for digital question mark (X, buy of Y) position of axle, obtain the eye land of fixed position then.

 

When 3M reveals type of 60 bits of capacitance to feel screen to operate, controller gives drive the clue for electric current early or late, make one specific electric field is formed between each node and lead consequently. Chase a scanning touch line to measure the capacitance change between its electrode to measure next, reach many bits of fixed position thereby. When the hand points to or touching agency to be close to, controller is measured quickly know to touch accuse the capacitance between node and lead to be worth a change, affirm then touch the niche that dominate. This kind of one root axis comes through an AC signal drive, and the electrode feeling that crosses the response of feeling screen to pass other axis to go up is measured come out. The person that use people call this induction of ” of ” cross type, also can call projectile type reaction. The plating on sensor has X, the ITO design of Y axis, when finger feeling is touched when controlling screen appearance, the capacitance value of lower part of point of lay a finger on accuses the far and near of the dot according to touching and increase, the successional scanning on sensor explores the change that is worth to capacitance, control chip plan cipher out to touch charge a point and redound gives processor.

 

Capacitance type touchs screen