Many products are exposed to outdoor sun or other direct light, which may require an anti-glare window for maximum legibility. An overlay window that is designed correctly should have minimal glare in direct sunlight.


The most common backlighting methods used are Fiber Optics and Electroluminescent panels. Sigma 6 Electronics works with a proprietary LED design which offers the same uniform backlighting over a large area. Both Fiber Optics and Electroluminescent have large prototyping costs due to tooling and some applications require an exterior light source or additional layers. Our LED technology embeds a few LEDs to light up a large area and is significantly less expensive in the prototype stages.


Brand your product with your logo. With one-of-a-kind graphic overlays and unique user interfaces, specific for your target audience you are sure to make a good impression. Digital printing will make your product marketing sizzle, and simple text and nomenclature help your users easily identify your product and its various applications. Check out the Rubber Keypad Design Guide and combine these two elements into the ultimate user interface experience!


There are inks, materials and adhesives to make your switch tolerant to any situation. Be confident in the performance of your device in all altitudes and temperatures by choosing a switch made for the harshest environments.

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Use your own custom graphics, logos and branding elements to create a unified customer experience.


Embossing membrane switches will give a 3-dimensional look to your graphic overlay, and is recommended for overlays activating micro switches. Material embossed for buttons are 1 to 1.5 times the thickness of the base material.

We offer three types of embossing: full, dome and border. Contact a Sigma 6 Electronics sales engineer for more information pertaining to your unique needs.


A more robust material, polyester has superior life cycle and chemical resistance properties. In life cycle testing, polyester shows no signs of wear at 1,000,000 cycles and is recommended for use with tactile metal domes or polyester domes (polydomes).

Known for its superior physical and electrical properties, polyester is the most commonly used base material for circuitry.


The most common graphic material used in overlay applications is polycarbonate, which is easy to print, die, cut and emboss. Polycarbonate has excellent optical clarity and color stability in light or white colors and can remain clear above 10mil (0.010”). Available in sizes up to 30mil (0.060) and higher.

The disadvantage of polycarbonate is that it begins to show signs of wear and tear sooner than some alternate materials. If a hard coat is not applied, the material will be susceptible to damage from a variety of chemicals and UV light. In most applications polycarbonate overlays will last a minimum of 100,000 cycles during life cycle testing.

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