Patent ID: 6975453

Claim:
A multilayer inorganic anti-reflective coating for application on a flexible substrate, wherein said coating comprises a stack comprising five material layers, respectively designated as the first, second, third, fourth, and fifth layer, starting from the layer situated farthest from the substrate, said second layer being in direct contact with said third layer and said third layer being in direct contact with said fourth layer, wherein said first layer has a refractive index less than the refractive index of said substrate and an optical thickness between 0.2 and 0.3λ 0 , wherein said second layer has a refractive index greater than 2.2 and an optical thickness between 0.4 and 0.6λ 0 , wherein said fourth layer has a refractive index which is substantially the same as the refractive index of said first layer and an optical thickness of less than 0.1λ 0 , wherein said fifth layer has a refractive index which is substantially the same as the refractive index of said second layer and has an optical thickness of between 0.025 and 0.1λ 0 , wherein λ 0 is about 510 nm, wherein said third layer comprises an electrically conductive material which provides said coating with an adjustable electrical sheet resistance of between 25 and 2000 Ω/sq, wherein said third layer is disposed in the coating at a position where the optical admittance Y of the coating takes a real value, and wherein said conductive material has a refractive index approximating said real value, so that the optical properties of the coating are not influenced by the presence of said third layer.