A flexible organic light emitting display (OLED) device includes an organic emitting diode on a flexible substrate, an encapsulation film covering the organic emitting diode and including a first inorganic layer and an organic layer. The first inorganic layer is formed of a first material, and at least a portion of the first inorganic layer includes a dopant that increases the surface energy of the doped material compared to that of non-doped material.