This article explains (Elo Pro-F and Pro-M) PCAP GFF (Glass, Film, Film) Dual Film Constructions

GFF dual film constructions (Elo Pro-F and Pro-M) GFF (Glass, Film, Film) design consists of a passive cover glass bonded to a double layer of film sensors laminated together with Optically Clear Adhesive (OCA). The conductive grids are deposited onto thin PET film material. Various competing technologies can be used for the conductive substrate including silver nano-wires, silver metal mesh or embedded wires but typically in the industry ITO is used for sizes less than 24 inches. For applications larger than 24 inches Elo offers Pro-M PCAP touchscreens which utilize a similar GFF stack-up (see figure 1). 



Pro-M design uses a highly transparent silver metal mesh film with tiny electrodes carefully arranged in a grid/mesh pattern on layers of plastic film. The silver metal mesh wire widths are so small, 4-7 um, they cannot be seen with the naked eye, which allows Pro-M designs to deliver a very sensitive touch experience without Moire issues. Conductive layer constructions utilizing technology other than metal mesh will have visibly embedded wires that may distract the user and take away from aesthetics of the screen. Mesh is typically used in large display sizes from 32 to 70 inches or greater. Elo’s Pro-M touchscreens are available in standard and custom sizes from 32 to 85 inches. 



Learn more about Elo's PCAP technologies in the Elo PCAP White Paper