Electroluminescent Lamp Backlighted User Interfaces

Electroluminescent backlighting on flat user interfaces with graphic overlays provides an even elimination when illuminated with electroluminescent (E/L) lamps. E/L lamps are custom-manufactured with very thin layers of plastic film with a transparent conductive surface with encapsulated phosphors that illuminate when energized.

For best lighting aesthetic appearance, mount the E/L lamp directly behind the graphic overlay and in front of metal switch domes and EMI shield. Proper selection of E/L lamp materials and construction, graphic overlay material and metal switch domes can give a good tactile feel for the end user.

Electroluminescent Backlighted User Interface


Electroluminescent Lamp Backlighted Features & Options

  • The electroluminescent lamp user interface includes a graphic overly, E/L lamp, optional EMI shield, metal switch domes, and printed circuit board.
  • Lighting is cool to the touch as the light source is the energized phosphors.
  • The electroluminescent lamp has the electrical characteristics of a capacitor so power dissipation (heat) is minimal.
  • E/L drive voltage is in the range of 80 to 120 VAC with higher illumination level at 400 to 500 Hz, although useful illumination is available at 60 Hz.
  • Custom E/L manufacturing process can provide for limited or customized areas of illumination or for individually driven areas of illumination with multiple E/L drive voltage control.
  • E/L brightness increases with higher driving voltage and frequency but E/L life is decreased. E/L brightness gradually decreases with use. Useful live is considered to be a decrease to about 50% of initial brightness and is in the range of several thousand hours.
  • E/L lamps operate from inverter modules that operate from available DC voltages found in most electronic applications.
  • Most inverter modules can compensate for E/L lamp aging by adjusting the drive level to offset some of the reduced illumination.
  • E/L lamps make the most sense when the E/L lamp switches off when not needed or activated by any user interface switch press.
  • Electroluminescent Lamp Colors Include: White, Aviation White, Light Green, Light Red, Light Yellow, Light Blue

Electroluminescent Lamp Backlighted User Interface
The above image depicts a typical electroluminescent lamp backlighted user interface.

Celebrating 65 Years of Manufacturing Excellence  Learn More →
America's Oldest. A History of Innovation.

Today at Epec, the customer comes first, and everything we do must be put through that filter. Whether it is developing e-commerce platforms to make it easier to work with us, or creating a NPI (new product introduction) process that helps our customers get to market faster, or the other 10 new projects we have in process, we must focus on building the new. By doing that every day, and by always making the customer our top priority, we plan on being here for another 65 years and then some.

Learn more about our 65 year story →



Celebrating 65 Years - Epec Engineered Technologies