Membrane switch with tinted display windows

Material：PET/PC

Thickness：0.1-1.0 mm  

Structure ：Overlay+Overlay spacer+flexible switch+insulate layer+Rear adhesive

Description：

Flat touch Membrane Switch

Keys embossed membrane switch  

Membrane switch with LEDs  

Membrane switch with Metal domes  

Membrane switch with Pins & connector

Light Guide Film (LGF)

Light Guide Film (LGF) is a thin film backlighting technology that will direct light produced by side-firing or right-angle LEDs across the area that needs to be backlit.

The advantage of LGF is that the film can be fabricated into almost any shape, providing consistent backlighting across one or more areas within the switch.

Multiple LGF films can be used within one application to provide discrete backlighting to different graphic features.

Different colored LEDs can be used to achieve unique lighting effects or white LEDs can be used to light different printed graphics on the overlay.

Although Light Guide Film can be more expensive than other backlighting technologies (below), it has several advantages:

1.The LGF is extremely thin so it can be incorporated into membrane switches that can’t exceed a certain thickness (i.e. small, lighter devices)

2.LGF has limited impact on the tactile feel of buttons.

3.LGF can provide even backlighting across large and small areas, including applications where the light remains on while the switch is powered.

How Are Membrane Switches Constructed?

Membrane switches are essentially a sandwich of thin layers that are bonded together using pressure sensitive adhesives. Depending on the application requirements, a membrane switch will consist of as few as 4, and as many as 9 layers. In contrast to mechanical switches, membrane switches offer the advantage of lower cost, they consume less design space with their low profile, are easy to clean, and they offer a sleeker, ergonomic, and aesthetically pleasing appearance.

The visible top layer of a membrane switch is the graphic overlay, with printed circuitry underneath the overlay. The circuitry can also incorporate different layers such as polyester (silver flex), polyimide (copper flex), and rigid PCB layers. Activation of a switch occurs when a printed shorting pad or metal dome makes contact with the bottom circuit layer thus, closing the circuit.