Shield

Shield

Overview

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.

Shield Value Range

The Shield parameter supports values from 0 to 6:

ValueDescription
0Shield disabled
1–5Increasing levels of EMI suppression
6Maximum Shield level

⚠️ Important: Higher Shield values may slightly reduce touch sensitivity. The Shield should always be set to the lowest effective value.

Check the Current Shield 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.

Set the Shield Value

To change the Shield level, specify a value between 0 and 6.

Example: Set Shield to 2

displaxservice -a 127.0.0.1 --shield 2

The new Shield value will be applied to the connected device.

When to Adjust the Shield

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

Best Practices

  • 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.

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