The backlighting of membrane switches and graphic overlays can create a dramatic visual effect that increases the functionality of a device, especially in low light environments

There are many ways in which to backlight a membrane switch. And each method has its advantage and disadvantages. We provide our customers with five different options so you can find the perfect system to meet your backlighting needs



LGF is a plane emission type of light guiding film made with transparent silicone rubber. When added to the current membrane switch structure, this film helps achieve even illumination across the surface. And yet by adjusting the layout, selected areas can be designed to light up in different intensity.

Furthermore, utilizing LGF can significantly reduce the cost and power consumption of a device by reducing the number of LED needed to illuminate the same area. LED light is shined from the edge of the LGF to be transmitted internally and emitted evenly where there are white refracting printed dots pattern which can be customized to your needs.


Environmental Operating Temperature -40°C to +80°C (-40°to 176°F)
  Storage Temperature -40°C to +85°C (-40°to 185°F)
  Humidity 40°C, 90% to 95% for 240 hours
  Vibration 20G's max.
Mechanical Actuation Force Non-tactile 60g to 300g (2oz to 10oz)
    Tactile 150g to 400g (6oz to 14oz)
  Switch Stroke Non-tactile 0.1 to 0.5mm
  Life Expectancy Tactile 0.6 to 1.5mm
    Non-tactile >5 million actuations
    Tactile >1 million actuations
Electrical Operating Voltage 35 volts maximum
  Operating Current 10 micro amps to 100 milliamps, resistive
  Operating Power 1 watt maximum
  Circuit Resistance 10 ohms to 500 ohms, dependent on size and layout
  Insulation Resistance 100M ohms at 100V DC
  Dielectric Withstand >250 VRMs (50-60Hz 1 minute)
  Contact Bounce ≤ 5 milliseconds