Ghost touch is an unwanted phenomenon in which a touch panel registers input even though the user has not touched the screen. The device may randomly trigger clicks, scrolling, button presses, or other unintended actions.
Ghost touch occurs most often in capacitive touch panels (CTP) and can be caused by electromagnetic interference (EMI), poor shielding, surface contamination, moisture, faulty touch controllers, calibration errors, or low-quality components. It may also result from poor PCB signal routing during design.
In industrial and medical systems, where stable touch performance is critical, preventing ghost touch requires robust shielding, signal filtering, isolation from interference, and the use of proven controllers and displays. False touches lower user comfort, increase operational risks, and may lead to complaints or costly redesigns.
