a plasma display filter includes five metallic layers , such as silver alloy layers , having a combined thickness that exceeds 50 nm . the metallic layers form an alternating pattern with dielectric layers , where the layer in the pattern closest to a supporting substrate is the first of the dielectric layers . layer thicknesses are selected to achieve a low reflected color shift with changes in the viewing angle , relatively neutral transmitted color properties , and desirable shielding characteristics with respect to infrared and electromagnetic radiation .