Touch Display Panel Positioning via Pressure-Calibrated Capacitance

The patent applies preliminary action by pre-applying pressures with different values to each reference position before actual touch detection. This creates a calibration dataset of capacitance values under known pressure conditions, which is stored and later used to accurately determine touch positions even when the touch panel is disposed above the display panel. The preliminary calibration compensates for the signal transmission issues through the display panel.

The patent utilizes parameter changes by varying pressure values applied to reference positions and measuring the corresponding capacitance changes. By establishing a relationship between pressure values and capacitance values through multiple measurements, the system creates a calibration curve or lookup table that enables accurate touch position determination despite the display panel interfering with signal transmission.

The time-consuming process of applying multiple pressures and calculating average capacitance values is performed as a preliminary calibration step during manufacturing or initial setup. This calibration data is then stored and reused during actual operation, so the accuracy improvement is achieved without recurring time consumption during normal touch detection.

The patent creates a copy of the calibration data (average capacitance values under different pressures) and stores it for reuse. Instead of repeatedly performing the time-consuming measurements during each touch event, the system uses the pre-created copy of calibration information to quickly determine touch positions by comparing current capacitance readings against the stored reference values.