EMI PROTECTION

EMI Shielding Film & Transparent EMI Screen Protection

EMI shielding film is a transparent conductive layer, such as ITO or a fine metal mesh, laminated to or deposited on a display’s glass and connected to ground. It blocks electromagnetic and radio frequency interference (EMI/RFI) from entering or leaving the display while still letting the image show through. E3 integrates it into custom LCD and touch screen assemblies.

Radio Frequency Interference (RFI) and EMI Protection for Displays

EMI is known as electromagnetic interference which is a disruption from another source. EMI is also referred to as Radio Frequency Interference (RFI). EMI happens when the operation is in close proximity to a device that emits signals. EMI can be caused by a variety of different things such as telephones, Bluetooth speakers, microwaves, sensors and many more. E3 Displays offers EMI shielding film integrated into LCD screens which deters outside electromagnetic interference. No matter what industry you operate in, you want to have the security of knowing that you have a reliable display screen that performs with no interruptions.

E3 Displays is continuously developing innovative ways to combat EMI. EMI can cause power flows and spikes with undesirable effects on both data collected by medical equipment and the way medical devices interact with each other. Having EMI shielding is important for numerous reasons. One main reason is that it builds a shield that helps keep displays and nearby electronics operating without interference in commercial buildings. Some of the main benefits of EMI shielding are increased system reliability, normal operation of electronic displays and better function of a system without interruption.

E3 Displays’ EMI protection prevents electromagnetic interference from disrupting your display. EMI protection increases system reliability and data security, and helps reduce unexpected resets and reloads.

EMI Filtering vs EMI Shielding

EMI Filtering

EMI filtering controls the amount of EM energy that flows through a display, directing it to the appropriate place, using a combination of capacitors and inductors. Using an EMI filter over an EMI shield can create a thinner and more lightweight display. Filters focus on the conducted noise while shields tend to focus on EMI emissions themselves. It is possible to use both a filter and a shield.

EMI Shielding

EMI shielding protects the entirety of the display in the form of a copper, aluminum, or stainless steel plate. This not only protects the display unit from EMI but limits the amount of interference that it produces itself. EMI shields also have the ability to absorb some of the EM wave and convert it into heat energy. In return, heat dissipation features may need to be installed.

Transparent EMI Shields for the Viewing Area

A metal plate cannot cover the part of the screen people need to see, so the viewing area uses a transparent EMI shield instead. E3 Displays offers two main options for an EMI screen:

ITO (indium tin oxide) coating: a thin, uniform conductive layer sputtered onto glass. It offers a clean, haze-free appearance and is often chosen when optical clarity is the top priority.
Metal mesh film: a fine conductive grid laminated behind the cover glass. Metal mesh typically delivers stronger shielding than ITO, and the mesh pitch and angle are selected to avoid visible moiré patterns.

Both options can be combined with anti-reflective film and optical bonding to offset the light loss of the conductive layer and keep the display readable in bright environments.

EMI Touch Screens: Shielding PCAP and Resistive Touch Panels

An EMI touch screen adds a grounded shielding layer to the touch panel stack. This is common in military displays, avionics displays and medical displays, where equipment must operate near radios, motors and other emitters. Because projected capacitive (PCAP) sensors measure small electrical fields, the shield layer, touch controller and grounding scheme must be designed together so touch accuracy is not affected. E3 engineers design the full stack of cover glass, EMI layer, PCAP sensor and LCD as one assembly. Programs that must meet EMI/EMC requirements such as MIL-STD-461 or DO-160 can use this integrated approach as part of their system-level compliance testing.

Connecting to EMI Layers

EMI layers can be applied to the front or the back of glass layers. A conductive material is utilized across the plane of the glass that will overlap the product bezel opening. When this layer is connected to ground, the opening in the bezel now has a conductive path to manage EMI noise. E3 Displays most commonly applies these conductive layers to the back of the glass so the conductive medium is not exposed to the user and environment. In order for the EMI layer to be conducted to ground, a path must be established. Since the glass is sized to the display, E3 Displays will provide the glass with a conductive ink/tape that is located on the back of the glass at a similar width to the display bezel and wrap around to the front of the glass. An EMI gasket can then be used to connect through the established path and utilize the EMI layer.

Design Options for EMI Shielding Film

EMI Tape – Metal Mesh

Many EMI problems can be solved with the use of EMI tape and insulation layers such as a mesh filter. EMI shielding Mesh filters allow for maximum optical performance with minimal reflection. In metal mesh solutions where a film mesh layer is laminated to the back of the glass, EMI tape is used to wrap from the back of the mesh to the front of the glass. EMI tape is cut to CAD specifications and is undetectable when installed.

Silver Epoxy Busbar – ITO

A busbar is a strip of conductive material that is applied to the edges of a display as an EMI shield. In ITO glass solutions where a sputtered layer of conductive ITO is applied directly to the glass, an AG (silver) conductive busbar can be printed from the ITO layer, side of the glass, to the front of the glass. E3 silver epoxy busbars are sized to the bezel width and are not visible when installed.

Achieving Optimal Device Performance With Emi Shielding Solutions

How to Specify EMI Shielding Film for Your Display

Define the threat: identify nearby emitters, frequency ranges and any EMI/EMC standard your program must meet.
Balance shielding and optics: weigh shielding effectiveness against light transmission, then choose ITO or metal mesh.
Plan grounding: confirm bezel width and choose EMI tape, silver epoxy busbar or an EMI gasket for the ground path.
Integrate with touch and bonding: design the EMI layer together with the PCAP sensor, optical bonding and any anti-reflective film.

Benefits EMI Protection Offers

Worldwide Availability

Your location does not limit your display potential. E3 Displays has worldwide availability on all of their products.

Custom Design

There is never a one size fits all display. E3 Displays works with you side by side to create a custom display solution made for you and your goals so you can have highly efficient and cost effective tools.

Guaranteed Performance

You need a display that is reliable and stands up to the toughest standards, which is why E3 Displays guarantees its thermal and EMI shielding performance.

Design Flexibility

There’s no need to design a completely new and complex display unit. With E3 Displays' multiple manufacturing processes, EMI protection can be easily incorporated into any design.

Our Experienced Team is Ready to Help

Our E3 Displays team has expertise in every type of display technology, whether big or small. We will help you choose or design the display that best fits your needs, while always keeping quality and budget in mind. Here at E3 Displays, we specialize in custom displays use our product selection guide today to get started on your project today!

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FAQ

Frequently Asked Questions

What is EMI shielding film?

EMI shielding film is a transparent conductive layer, usually ITO or a fine metal mesh, applied to a display’s glass and connected to ground. It blocks electromagnetic and radio frequency interference from entering or leaving the display while keeping the screen visible. It is common on military, avionics, medical and industrial displays.

What is the difference between EMI shielding and EMI filtering?

EMI shielding uses a conductive barrier, such as a metal plate, ITO coating or metal mesh, to block radiated interference. EMI filtering uses capacitors and inductors to control conducted noise traveling through a display’s circuits. Filters can make a display thinner and lighter, and many designs use both a filter and a shield.

Is ITO or metal mesh better for a transparent EMI shield?

It depends on your priorities. ITO gives a uniform, haze-free coating that suits applications where optical clarity matters most. Metal mesh typically provides stronger shielding and is often chosen for military and high-interference environments. The right choice balances shielding effectiveness, light transmission and cost for your specific display.

Does an EMI shield affect a touch screen?

It can if it is not designed correctly. PCAP touch sensors detect small changes in electrical fields, so a grounded EMI layer must be placed and grounded in a way that does not interfere with touch sensing. Designing the EMI layer, touch sensor and controller together keeps an EMI touch screen accurate and responsive.

Does EMI shielding film reduce display brightness?

Yes, slightly. Any conductive layer in the viewing area absorbs or blocks a small amount of light, which lowers transmission. The loss depends on the ITO thickness or mesh density. Adding anti-reflective film, optical bonding or a brighter backlight can offset the loss and keep the display readable.

How is an EMI shielding layer grounded?

The conductive layer needs a path to ground through the display bezel or housing. E3 Displays typically uses EMI tape wrapped from the back of a metal mesh to the front of the glass, or a silver epoxy busbar printed from an ITO layer. An EMI gasket then connects that path to the enclosure.

Which industries need EMI protection for displays?

Military, avionics, medical, industrial and marine applications most often need EMI protection. These displays operate near radios, radar, motors and other emitters, and interference can corrupt data or disrupt operation. EMI shielding also limits the emissions a display produces, which helps the overall system meet EMC requirements.