Protruding Keyboard Touch Display With Position-Variation Sensing

The invention changes the detection parameter from electrostatic capacitance to operation target position coordinates. By tracking the position of the operation target (finger) across multiple time points and calculating position variation, the system can accurately detect touch operations on keyboard-shaped switches even when electrostatic capacitance variation is minimal. This parameter change resolves the contradiction by finding an alternative measurement approach that works effectively for protruding switch geometries.

The invention applies local quality by providing protrusions only at specific switch locations on the cover glass rather than making the entire cover glass protruding. This allows the cover glass to remain simple and easy to manufacture overall, while locally adding tactile features where needed for operational accuracy. The protrusions are strategically placed to provide tactile feedback for keyboard-shaped switches without complicating the overall manufacturing process.

The invention introduces an intermediary detection method using operation target position tracking. Instead of directly detecting electrostatic capacitance changes, the system uses the position coordinates of the operation target as an intermediary parameter. By calculating the variation in position coordinates over time, the system can reliably detect touch operations even when the operation target is placed away from the touch panel surface, thus maintaining reliability without depending on electrostatic capacitance differences.