NEWS MARCH 2025

As a Hardware Design Engineer integrating a TFT Module within a wider Mechanical Enclosure, your finished product will naturally be subject to EMI and EMC Testing and Certification. 

 

Halo can help provide guidance on reducing Electromagnetic Interference (EMI) in TFT display modules. Proper EMI control improves device reliability, reduces emissions, and ensures compliance with regulatory standards.

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Key EMI Reduction Measures

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1. PCB Layout Optimization.

- Use a solid ground plane.
- Keep signal traces short, especially between the display driver and the panel.
- Route signals differentially where applicable.
- Place 0.1 µF decoupling capacitors near each power pin and a bulk capacitor nearby.

 

2. Shielding and Filtering

- Use ferrite beads on power lines.
- Apply conductive film or mesh over the display.
- Add common-mode chokes to suppress noise.

 

3. Signal Management

- Reduce signal slew rate using series resistors (33–100Ω).
- Tie unused inputs to GND or VDD to prevent floating.

 

4. Power Supply Conditioning

- Use low-noise LDOs or DC/DC converters.
- Apply a single-point ground scheme to avoid ground loops.

 

5. EMC Testing

- Use a spectrum analyzer to detect radiating sources.
- Perform pre-compliance EMI testing.

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Integration Tips

- Ground all shielding materials properly.
- Overlap materials or use conductive adhesives to avoid gaps.
- Consider shielded enclosures for noisy electronics near the display.