How touch technology works?

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How touch technology works?

In: Technology

Conductivity.

There’s an electric field across the whole screen. Your fingers are conductive, so when you touch the screen, some of that electricity drains away. The device has sensors all around and so can tell how far across and how far up that screen that happened.

That tells the computer exactly where the touch happened.

Also, there’s resistive sensors. They have something like two webs of conductors separated by an isolator. When you press on their surface, you short-circuit small wires inside that sensor and the device will detect current and, based on which wires the current is, will determine where you pressed it. Unlike conductive sensors, resistive sensor can work even when you’re wearing gloves or underwater or in dirty environment. But they interfere with display quality (they are slightly opaque), they are somewhat unreliable and not as precise as conductive sensors.