How Do Touchscreens Detect Finger Touch?

💡 The Answer

• Capacitive touchscreens rely on the human body's natural conductivity to distort the screen's electrostatic field.
• A grid of tiny electrodes beneath the glass constantly measures capacitance changes at each intersection point.
• When a finger comes close, it steals some electric charge, and the controller calculates the exact touch location.
• This technology allows for multi-touch gestures like pinch-to-zoom because multiple points can be tracked simultaneously.