ITO is used as the conductive layer in a touchscreen. If you would replace ITO in a capacitive touchscreen, would it ideally have a lower or high relative permittivity? The relative permittivity (dielectric constant) is proportional to the capacitance.
A capacitance touchscreen measures the change in capacitance.
So if you would replace ITO with another conductive and transparent material, would it be useful to have the dielectric constant and therefore the capacitance as low as possible, so the Signal-To-Noise ratio for the change in capacitance would be higher?
Or would it be more useful to have the capacitance as high as possible, so the screen can store more charge?
If you increase the capacitance, wouldn't the relative change in capacitance/electric field be smaller and make the sensor less accurate?