A display panel apparatus includes a planarizing film formed on a substrate, at least one pixel including a lower electrode; an organic EL layer; and an upper electrode which are formed above the planarizing film; an auxiliary electrode electrically connected to the upper electrode which is the opposite to the lower electrode; a display section including a plurality of the pixels; an electrode plate electrically connected to the auxiliary electrode and arranged to cover the planarizing film outside the display section, and the electrode plate has a hole exposing a part of a surface of the planarizing film. Furthermore, the display panel apparatus also includes a hole injection layer which is an inorganic material layer made of an inorganic material and covering the hole.