A flexible organic light emitting diode display panel includes a substrate, a first inorganic layer, an organic layer, and a second inorganic layer. The first inorganic layer doped with copper or silver and is disposed on the substrate. A doping concentration of copper or silver in the first inorganic layer is 8-40 atom percent. The organic layer is disposed on the first inorganic layer. The second inorganic layer is doped with copper or silver and is disposed on the organic layer. A doping concentration of copper or silver in the second inorganic layer is 8-40 atom percent.