EMI (Electromagnetic Interference) can significantly affect the performance and reliability of modern electronic devices. In sensitive applications such as medical devices, defense industry equipment, industrial control systems, and aerospace electronics, high-level EMI protection is not just important — it’s essential.

In Turkey, Stil Elektronik is the only company capable of manufacturing both ITO film EMI shield and ITO conductive mesh EMI shield membrane switches.

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What is ITO Film and How Does it Provide EMI Shielding?

ITO (Indium Tin Oxide) is a transparent and conductive coating applied to polyester (PET) or polycarbonate (PC) films. It offers:
• Transparency – Preserves display clarity for LCD, LED, and other visual interfaces.
• Conductivity – Effectively grounds and dissipates electromagnetic interference.
• Thin Profile – Adds minimal thickness to membrane switch assemblies.

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Conductive Mesh Technology for Enhanced EMI Shielding

For high-frequency EMI challenges, ITO coating alone may not be sufficient. This is where conductive metal mesh technology comes into play. Stil Elektronik integrates:
• Micron-level stainless steel or copper mesh onto ITO films.
• Superior shielding effectiveness across a wide frequency range (MHz–GHz).
• Compliance with military and medical EMI/EMC standards.

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Why Stil Elektronik Stands Out

Among numerous membrane switch manufacturers in Turkey, Stil Elektronik is the only one with in-house capabilities for both ITO film EMI shielding and conductive mesh EMI shielding.
Key factors behind this capability include:
1. High-precision lamination technology
2. Professional EMI shield design engineering
3. In-house EMC testing infrastructure
4. Multi-layer membrane switch integration expertise (LED backlight, EL backlight, metal dome, etc.)

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Applications
• Medical Devices – Patient monitors, ventilators, laboratory instruments
• Defense Industry – Vehicle control panels, radar systems
• Industrial Automation – PLC control units, factory machinery interfaces
• Aerospace & Marine – Cockpit panels, navigation systems

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Conclusion

Stil Elektronik is Turkey’s only manufacturer offering both ITO film EMI shielding and ITO conductive mesh EMI shielding technologies under one roof.
With advanced production facilities, engineering expertise, and compliance with international standards, Stil Elektronik is a trusted partner for both domestic and global markets.

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CAPACITIVE SWITCH & CAPACITIVE TOUCH FILM & CAPACITIVE TOUCH FOIL

In recent years, more and more industry products have adopted capacitive touch technology solutions, which have further upgraded the user experience in human-computer interaction. Automobiles, home appliances, office equipment, and more have taken the lead in using these technologies. Capacitive touch solutions make the products more fashionable, simpler, durable, and cost-effective. Stil has accumulated rich experience in the development and design of capacitive touch products and can provide you with a variety of capacitive touch solutions. Contact us to learn more.

WHAT IS A CAPACITIVE MEMBRANE SWITCH?

A capacitive membrane switch, also known as a capacitive touch film, capacitive touch switch, capacitive switch, or capacitive sensor, operates by detecting changes in capacitance caused by finger touch. This technology moves away from mechanical button switches, eliminating faults caused by mechanical wear.
Capacitive membrane switch products can be made very thin, with thicknesses usually ranging from 0.10 to 0.50 millimeters. They are flexible and can be used for different shapes or curved surface applications. Capacitive membrane switches have high transparency in the icon area, allowing backlighting to pass from the bottom circuit to the plastic icon. The capacitive touch film is applied to the back of the user interface, which is usually a glass or plastic cover plate with graphical icons or switches.

ADVANTAGES OF CAPACITIVE MEMBRANE SWITCHES:

• 
Its flexibility allows it to be combined with curved surface products.

Smooth surface with no protruding keys.

The lighting function can be easily achieved through transparent conductive media using LGF.

The structure is simple, up to three layers, and its thickness can be flexibly controlled. It can be thinner than membrane switches.

As there are no mechanical keys like in traditional membrane switches, capacitive touch switches have almost no wear and tear, extending their lifespan!

Please contact us to meet our top quality products that we have created by synthesizing our knowledge of over 35 years with superior technology and raw materials.

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According to the production type, the button life of the contacts is between 600.000 clicks and 1.000.000 clicks in the button fatigue tests performed by making 4 strokes per second. This ensures that the products we produce work smoothly for many years. All membrane switches produced, whether on the basis of samples or in tens of thousands, are sent to the companies we serve, after 100% visual and functional tests are performed. All membrane switch products produced are guaranteed for 2 years.

One of the details that makes us different from the others is the high coefficients of the insulators we use in bridging on conductive roads. Application is very important here. Since the insulator coefficient is high and our application technique is unique to us, we reduce the risk of possible electrical wear on the bridges over time to zero. This application is included in all bridged membrane switch products that we produce as standard.

Another difference is that we can apply the Membrane Switch technology in the backlit lighting technology by combining it perfectly. The lighting elements we use here consist of the world’s best and longest-lasting materials. We produce Backlit usually with Electroluminescent Technology. Production time is quite less and lighting is very homogoneus and high quality.
In short, Stil Elektronik produces Membrane Switches with faultless production and long-lasting use, as they come together with experience, application, quality equipment and the right material.

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A membrane switch is an electrical switch for turning a circuit on and off. It differs from a mechanical switch, which is usually made of copper and plastic parts: a membrane switch is a circuit printed on PET or ITO. The ink used for screen printing is usually copper / silver / graphite filled and therefore conductive.

Membrane switches are user-equipment interface utilities that allow for the communication of commands from users to electronic devices. Membrane switches can be thought of as one category of interface utilities alongside touch screens, plastic keyboards, toggle switches and many other kinds of control systems. Interface utilities can be as simple as tactile switches for controlling lighting, and they can be as complicated as membrane keyboards and switch panels for use with computers.

Construction of Membrane Switch

The ASTM defines a membrane switch as “a momentary switch device in which at least one contact is on, or made of, a flexible substrate.”

A membrane switch typically has 4 or more layers. The top layer of a membrane switch is the graphic interface between the user and the machine. The another critical layer is a printed circuit. This can also be a flex circuit made of copper and polyimide material. The layers are normally assembled using pressure-sensitive adhesives although inexpensive designs can be held together by other mechanical means such as a keyboard housing. Contact between two traces can be made through a printed shorting pad or through a metal dome that stands on legs.^[1]

Backlighting in Membrane Switch

There are three standard methods for back lighting membrane switches.

The first option is using Light Emitting Diodes (LEDs) to back light. However, LEDs create bright spots and are not suitable for overall back lighting of a panel, but rather as indicator lights. LEDs can either be surface mounted to the circuit layer or be placed on a separate LED layer.

A second option is optical fiber. In a typical design, two or more layers of woven fiber-optic cloth are used to form a rectangular light-emitting area. The fibers coming off one end are then bundled into a circular ferrule and coupled to one or more LED light sources. Remote light sources offer 10,000 to 100,000 hours of life. Optical fibers are not affected by extremes in humidity (0% to 100%) or temperature (-40 to + 85 deg C).

The third standard option is to use electroluminescent (EL) lamps. They are lower priced compared to fiber optics and offer additional design flexibility. The color of light emitted from an EL lamp can vary depending on the phosphors that are used. Some common colors are blue/green and yellow/green, white, blue and orange. EL lamps have a half-life of approximately 3000–8000 hours depending upon the quality of the phosphor. Once they reach their half-life, the brightness starts to fade rapidly. EL lamps are thus not a good choice if the lamp is on for an extended period of time. Fading or flashing could double the life of the lamp.

Applications

Classic applications of membrane switches include Microwave oven panel, air conditioner control panel, TV remote control , Oil Pump devices , Medical devices and Hospital beds panels , Aerospace and Defence Industry etc. Tactile feedback of keys can be provided by embossing the top PET layer or embedding metal snap domes, polyester domes or forming the graphic layer.

The benefits of membrane switches include ease of cleaning, sealing ability and their low profile. Membrane switch can be used together with other control systems such as touch screens, keyboards, lighting, and they can also be complicated like the membrane keyboards and switch panels in mobiles and computers. They are reliable, effective, low-cost user interfaces, suitable for a wide range of products, and available with many creative options.

Depending on industry and application, membrane switches are also referred to as membrane keyboards and membrane keypads

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