The Shield feature in DISPLAX Service is used to reduce the effects of electromagnetic interference (EMI) on a touch sensor. Increasing the Shield value helps suppress noise that can cause false touches or unstable touch behavior, especially in electrically noisy environments.
Shield adjustments can be read or applied directly via the command line.
The Shield parameter supports values from 0 to 6:
| Value | Description |
|---|---|
| 0 | Shield disabled |
| 1–5 | Increasing levels of EMI suppression |
| 6 | Maximum Shield level |
⚠️ Important: Higher Shield values may slightly reduce touch sensitivity. The Shield should always be set to the lowest effective value.
To view the current Shield level on a local device, run:
displaxservice -a 127.0.0.1 --shield
This command returns the active Shield value.
To change the Shield level, specify a value between 0 and 6.
displaxservice -a 127.0.0.1 --shield 2
The new Shield value will be applied to the connected device.
You may need to increase the Shield value when:
Grey dots or noise appear along the sensor borders in the canvas of Displax Connect
False or “ghost” touches are detected
Touch behavior is unstable near power supplies, LED walls, or industrial equipment
The installation environment has strong or fluctuating EMI
Start with Shield = 0 and increase gradually.
Test touch responsiveness after each adjustment.
Avoid setting the Shield to the maximum unless necessary.
Combine Shield tuning with Gain and Threshold adjustments for best results.
Document Shield values for each installation environment.