Touch Pad Force Calibration via Reference Table Compensation
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Solution Overview
Problem
After assembly with an electronic device, the touch pad module's force sensing accuracy may be reduced due to slight errors in assembly processes or internal structures, leading to decreased force accuracy.
Innovation Solution
A method for calibrating the sensed force of a touch pad module, involving the creation of a force reference table before assembly, with compensation ratios calculated and applied after assembly to maintain high force accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch pad module is assembled with an electronic device, then the touch pad module can be used in a complete device, but the force sensing accuracy decreases due to assembly errors and internal structure variations
Solution Approach 1:
The patent performs force sensing calibration before the touch pad module is assembled into the electronic device. By conducting the calibration in advance on the standalone touch pad module, the system establishes baseline force sensing data that can later be used to compensate for assembly-induced variations, thereby maintaining force sensing accuracy after assembly
Solution Approach 2:
The patent changes the calibration parameters by performing force sensing measurements at multiple different positions on the touch pad surface. By collecting force data at various locations and adjusting the calibration parameters accordingly, the system compensates for assembly errors and internal structure variations that occur when the module is integrated into the electronic device
Data Source
AI summary
A method for calibrating sensed force of a touch pad module is provided. The touch pad module includes a touch pad and force sensing elements disposed therebeneath. The method includes: obtaining a force reference table obtained before the touch pad module is assembled with an electronic device, the force reference table including a first data, which includes a first point of the touch pad and first force reference values corresponding to the first point and respectively corresponding to the force sensing elements; placing a calibration block on the first point after the touch pad module is assembled with the electronic device, so the force sensing elements respectively obtain first force test values corresponding to the first point; calculating first compensation ratios according to the first force reference values and the first force test values; and inputting the first compensation ratios into the force reference table.