Electromagnetically shielding bonding film

An electromagnetic shielding assembly, comprising:

• electromagnetic shielding film, wherein said electromagnetic shielding film comprises substantially transparent plastic base film, and geometrically patterned electroconductive material formed at least on one side of said transparent base film, said geometrically patterned material having a line width of 40 μm or less, a line spacing of 200 μm or more, and a line thickness of 40 μm or less;
• and
• a pair of substantially transparent base sheets attached to either side of said transparent plastic film, said base sheets having a substantially identical thickness, and wherein a difference in the refraction index between said transparent base sheet and said transparent base film is 0.14 or less.

A method for making an electromagnetic shielding bonding film, comprising:

• forming geometrically patterned electroconductive material having a line width of 40 μm or less, a line spacing of 200 μm or more, and a line thickness of 40 μm or less over a substantially transparent base film, the geometric pattern providing an aperture ratio of 80% or more, wherein said transparent base film is at least one member selected from the group consisting of polyesters, polyolefins, vinyl resins, polysulfone, polyethersulfone, polycarbonate, polyamide, polyimide and acrylic resins having a visible light transmission factor of 70% or more;
• coating a bonding agent composition over a part or an entirety of at least one side of said base film, wherein a difference in the refraction index between said transparent base film and the bonding layer formed by said coated bonding agent is 0.14 or less;
• said base film being prepared as a roll web.