Really? Is it just the really crappy third party chargers that present the problem? I use one of the high-output dual port chargers in my truck and I've never had an issue with the screen going wonky. I bought it specifically to charge my tablet, but I stuff the phone in using the 1amp port to charge it on the long @)* trip to work.
I am not sure what part of what I said you are in disagreement with. Are you saying your "high-output dual port charger" is one of those "really crappy third party chargers" and yet it doesn't do what I eluded to, therefore what I've said is somehow wrong? Or are you saying it's the phone and it doesn't matter what charger is used (something I can disprove explicitly)? Or are you saying that you agree with what I've said and that your "high-output dual port charger" is NOT the "really crappy third party charger" and your experience backs up my claim? I really don't understand your reasoning. Please help me to know what it is exactly that you are trying to prove with your post.
The screen's digitizer is using a very unique method of detection of your finger's location by reading the Mutual Capacitance at capacitor junctions just below the screen surface, and it's that mutual capacitance, or more accurately the change in that mutual capacitance that is used to triangulate the position of your finger(s), and also allows for multi-touch (detection of more than one contact point at the same time), as well as the ability to detect finger presence even with a screen protector in place. The issue with these screens becoming confused by chargers that are not as well filtered (clean power with little detectable ripple or RF interference), is that they are detecting extremely small changes in electrical charge difference at the junctions beneath the surface of the digitizer's glass, and it's that tiny change in the capacitance beneath the glass and your finger or other potentially electrically charged surface acting on the electrostatic field surrounding the individual capacitors that allows the screen to identify where your finger or other pointing device is positioned.
Many people think these screens actually need finger to glass contact in order to work, but any screen protector that allows these screens to operate can prove this wrong. In fact, a piece of notebook paper, a piece of plastic food wrap (both of which are insulators) can be laid on the screen and you can still select and scroll. In fact, you can place the phone inside a closed zip-lock bag, and still use it normally. You can even (if you're extra steady with your hand and careful), select or scroll the screen without actually touching it, but by getting your finger so close that it is almost touching.
It's not really any different than how a small transistor radio can be made to receive different radio frequencies by bringing your finger near the tuner, instead of turning the tuning knob. What's actually happening behind that knob is a variable capacitor is being adjusted so that the separate elements (vanes) of that capacitor are being either moved closer to or farther away from each other so that more or less of the surface areas of opposing elements are in close alignment, creating more or less potential capacitance between the two closely spaced conductive surfaces. See
Variable capacitor - Wikipedia, the free encyclopedia. If you bring your finger near one of those variable capacitors inside the cabinet - without touching while the radio is playing, you will cause a change in the capacitance by disrupting the electrostatic field around it and the radio will actually tune to a different station - all without turning the dial.
So why does a "really crappy third party charger", or even a "not so crappy third party charger" (such as the Apple iPhone charger I have at home) cause this screen to become jittery or act sporadically? Because those tiny fluctuations in the voltages or current coming from the chargers imparts another variable into the already extremely precise calculations going on which detect finger position. ANY additional "vibration" of the voltages can potentially be interpreted as a change in the capacitance difference of a finger being placed on or moved about the screen.
