Which type of touchscreen uses a single metallic-coated panel and uses electricity to calculate touch points?

Which type of touchscreen uses a single metallic-coated panel and uses electricity to calculate touch points?

• A. Resistive
• B. Capacitive
• C. Infrared
• D. Projective Capacitive

Answer: (D)

Capacitive touchscreens detect touch by measuring changes in electrical capacitance on a conductive surface. A single metallic-coated panel (usually a transparent conductor like ITO on glass) forms a capacitor with the finger. When your finger nears or touches the surface, it alters the local capacitance, and the controller calculates the touch coordinates from these changes. This approach relies on electricity flowing through the panel and into the finger to sense location. The other types don’t fit as neatly: resistive screens rely on physically pressing two conductive layers together to register a contact, not on measuring capacitance of a single panel. Infrared screens detect touch by interrupting an invisible light grid around the edges rather than by capacitive changes. Projective capacitive screens do use capacitive sensing, but they typically involve multiple electrode layers or a grid to project the field and determine coordinates, rather than a single metallic-coated panel.

Capacitive touchscreens detect touch by measuring changes in electrical capacitance on a conductive surface. A single metallic-coated panel (usually a transparent conductor like ITO on glass) forms a capacitor with the finger. When your finger nears or touches the surface, it alters the local capacitance, and the controller calculates the touch coordinates from these changes. This approach relies on electricity flowing through the panel and into the finger to sense location.

The other types don’t fit as neatly: resistive screens rely on physically pressing two conductive layers together to register a contact, not on measuring capacitance of a single panel. Infrared screens detect touch by interrupting an invisible light grid around the edges rather than by capacitive changes. Projective capacitive screens do use capacitive sensing, but they typically involve multiple electrode layers or a grid to project the field and determine coordinates, rather than a single metallic-coated panel.