Backlighting Solutions

CSI Keyboards is a global leader in membrane switch backlighting and interface backlighting technology. Whether you wish to backlight your logo, individual keys, or the entire interface surface, CSI will design and manufacture a backlit switch or backlit interface that will stand out both visually and aesthetically. CSI’s backlit products include: backlit human machine interfaces, backlit membrane switches, backlit elastomeric keypads and backlit panels or signage.

Backlit keypads are perfect for any industry and are often used in military and aerospace applications to help the user better interface with our customer’s product or instrument. A backlit keypad or interface can also help a product stand out from the competition as it gives the keypad a sharper look and are excellent for low light environments.

CSI Keyboards uses many different technologies to backlight your product including but not limited to:

  • LEDs: the most popular and economical method for keyboard backlighting. LEDs are most commonly used to backlight keys, icons and symbols. LEDs are also typically used as indicator lights. A combination of LEDs, Light Guide Film and proprietary CSI backlighting methods can be designed to backlight the entire surface of a user interface.
  • Light Guide Film (LGF): designed to evenly distribute light from top or side firing LEDs, providing bright, uniformed illumination. It also reduces the amount of LEDs needed, saving power consumption. More on light guide film technology below. The design and utilization of light guide film (LGF) technology has become one of the most common methods of interface backlighting. CSI Keyboards uses proprietary techniques to design the light guide film so it is optimized for light redirection and reflection giving the customer the brightest possible backlighting solution. Light guide film dots are also designed and implemented which allow for the optimization of light distribution to obtain maximum brightness and uniformity. Common problems that many of our competitors face are light leakage and hot spots. CSI’s backlighting designs prevent any light leakage and hot spots from occurring, and also result in much brighter light guide film and interface.
  • Electroluminescence (EL): applied on a very thin layer between the graphic overlay and the circuit. EL uses a printable ink deposit to illuminate the switch and provide a uniformed illumination.
  • Fiber Optics: provides a flexible back lighting layer that can be incorporated between the graphic overlay and the circuit layer allowing the entire surface area of the membrane switch to be evenly backlit.

Membrane Switch Backlighting
CSI Keyboards has been backlighting membrane keyboards and user interfaces for over three decades. We’ve used backlighting techniques from the simplest LED membrane switch using a single colored LED indicator with a transparent smoked LED window (to hide LED from surface), to the most complicated multi-colored membrane keypad switch assembly. We can bring your product to life and make it truly stand out from your competition by backlighting keys, nomenclature, logos, perimeters, indicators, or the entire keypad.

Rubber Switch Backlighting
When it comes to elastomeric keypad backlighting, CSI has both the knowledge and expertise to utilize and take advantage of molded silicone rubber which is an excellent conductor of light. CSI Keyboards utilizes laser etching and light pipe technology as some of our many techniques. CSI Keyboards, Inc. has designed and manufactured backlighting solutions for top tier medical, military and many different civilian industries.

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