4-Wire resistive touch screen is the preferred solution for low cost applications. It consists of a conductive bottom layer (ITO Glass or Film) and a conductive top layer (ITO Film). The two layers are suspended by many very small spacer dots . When a certain point is touched, the top layer contacts the bottom layer and a voltage charged by the controller is applied to the bottom layer's electrodes. The coordinate X axis of the touch point can be detected by measuring the voltage value thru the top ITO layer and the coordinate Y axis of the touch point can be detected in the same way by changing voltage input to the top layer's electrodes.

Input flexibility -finger (with/without glove), stylus, pen, credit card.
FPC tail technology surpasses those of our competitors.
     o FPC has lower resistance and is more flexible than PET or ITO film used by other suppliers.
Excellent optical performance even with anti-glare hard coating film.
     o Capable of handling spacer dots diameter less then 0.035mm (smallest in the industry).
     o Haze < 6% (best optical performance in the industry).
Various choices of surface treatments available.
     o Anti-Newton ring, anti-glare, special chemical hard coating.