There are mutual capacitance and self-capacitance screens. The first responds to a decrease in the capacitance between the two electrodes, and the second responds to an increase in the capacitance when touched.
Moreover, water is an excellent conductor of electricity. When a drop hits the screen, it starts to act like another finger. This is perceived as an incorrect touch by the smartphone. But we are specifically talking about self-capable displays.
As for mutual capacitance screens, when water gets on the surface of the screen, it receives conflicting signals. As a result, the smartphone cannot respond to your actions as it should.
Even if you wipe the screen, the system will need some time to return to its original performance. Until then, the screen will continue to dim.
Fortunately, some screens now feature special scanning technologies that make it possible to prevent finger touch from being mistaken for water. They combine self-capacitance and mutual capacitance scanning.
Source: Ferra
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