LGF (Light guide film) Backlit Membrane Keypads
Backlit membrane switches
The light guide film (LGF) brings integrated LED backlighting to membrane switches and front panel decals allowing text and full key illumination. Our LGF provides even light distribution across the keypad/decal front panel while keeping the thickness similar to standard membrane switch panels.
Outstanding Reliability for membrane switches
We test our membranes, materials and components for operational lifespan to give you peace of mind
This short clip shows an actuation test where the life cycle of the keypad components with movement, such as a metal snap dome and overlay can be stress tested. A design can achieve 1M+ actuations.
What material should I specify for decal and membrane switches?
See the post below for an explanation on the different physical properties of various Overlay material (front layer material) Membrane material design
There are two basic types of circuit layers that are used in membrane switch assemblies, PET and FPC. PET is a polyester where the circuit is silver ink and applied to the base material in a screen printing process
FPC or flexible printed circuit
FPC is a polyimide (Kaptron) base with a copper etch for the circuit, similar to traditional PCB manufacture but in a much thinner format and allows for soldering of components and connectors.
Membrane switch overlays are typically polyester material. Polyester allows for the flexibility required for membrane switch operation without fracturing the overlay. Polycarbonate, is unsuited for membrane switches, but is perfectly fine for decals and labels where there is no movement required. For every material advantage, there will generally be an offset and the toughness of polyester limits the embossing height.
Polyester films are available with gloss or textured finishes in the film itself. While texturing and gloss finish areas can also be silk screened onto the base overlay polyester.
For outdoor applications, we recommend Autotex XE for its UV stability