Capacitance Pressure Sensor for Touch Input Devices

The patent combines a touch sensor panel for position detection with a pressure sensor for pressure magnitude detection into a single integrated system. The touch sensor panel includes electrodes for detecting touch position, while the pressure sensor uses a separate electrode and reference potential layer configuration to detect pressure magnitude through capacitance changes, allowing both functions to operate simultaneously without interfering with each other.

The touch input device is designed to perform multiple functions: it can detect both touch position and pressure magnitude using the same physical interface. The pressure sensor component achieves this by creating a capacitance-based detection system where the distance between the pressure sensor electrode and reference potential layer varies with applied pressure, enabling the device to universally handle both positional and pressure information from a single touch interaction.

The patent replaces complex mechanical pressure sensing mechanisms with a capacitance-based electrical detection system. Instead of using mechanical levers, springs, or force sensors that would add significant complexity, the invention uses changes in capacitance between electrodes caused by distance variations under pressure. This electrical field-based approach simplifies the overall device structure while maintaining pressure detection functionality.

The pressure sensor detects pressure magnitude by measuring changes in capacitance, which occur when the distance between the pressure sensor electrode and reference potential layer changes under applied pressure. By monitoring this electrical parameter (capacitance) rather than direct mechanical displacement, the system achieves pressure detection with minimal structural complexity. The capacitance change serves as an indirect but accurate measure of pressure magnitude.