Phantom Key Detection/Prevention TRIZ Cases
- Keyboard Resistance Sensing to Prevent Ghost Key Detection Errors
A resistor-sequenced sensing circuit distinguishes simultaneous key presses by voltage division, preventing ghost keys without added diodes.
- Variable-Frequency Key Signal Sampling Against False Triggers
Varying the key-signal sampling frequency helps avoid external noise alignment, reducing false triggers and missed detections.
- Capacitive Touch Matrix Layout for Two-Touch Ghosting Suppression
Corner electrodes add extra capacitance measurements to resolve diagonal two-touch ambiguity and suppress ghosting in capacitive key matrices.