LGF membrane switch
1 embossed key with metal dome inside
Autotex F150 as graphic overlay
3M 467 as rear adhesive
LGF (light guide film) inside membrane switch
FPC as below circuitry
LGF (light guide film) membrane switch can offer bright and even backlighting with usual thickness of 1 mm or more; you can design custom lighting area for texts or keys and choose custom LED lighting colors (white, red, green, yellow and blue). Comparing to EL backlight, LGF (light guide film) saves EL driver IC, so circuitry for LGF membrane switch become more simple and reliable; further more, LED lighting has much longer working life than EL light.