How do touchscreens work?
Show answer & explanation
Answer: Sense electrical field changes
Detect pressure from fingers — Wrong. Modern touchscreens don't rely on pressure. Old resistive screens did, but today's capacitive screens detect electrical changes from your finger's conductive properties.
Sense electrical field changes ✓ — Correct! Most touchscreens use capacitive technology. Your screen has a grid of sensors that create a tiny electrical field. When your finger touches it, your body absorbs some electricity, changing the field. The phone calculates exactly where you touched. This explains why touchscreens don't work with gloves—they block the electrical connection!
Cameras track finger position — Wrong. Touchscreens don't use cameras to track fingers. They have an electrical sensor grid beneath the glass that detects touch through field changes.