In an organic EL display device comprising a substrate, a plurality of pixel
regions
in each of which a first electrode, a light emitting material layer, and a second
electrode are laminated in this order above the substrate, and a bank film formed
above the substrate to separate respective one of the pixel regions from another
of the pixel regions adjacent thereto, wherein the bank film has a plurality of
openings exposing upper surfaces of the first electrodes to the light emitting
material layers in the respective pixel regions, and the second electrode is formed
over the a plurality of openings of the bank film in common with the pixel regions,
the present invention forms the bank film of an inorganic material and shapes a
side wall thereof lying around each of the openings thereof to be sloped at an
angle less than 85 degrees () with respect to a principal surface of the
substrate in order to prevent the deterioration of the light emitting material
layer and disconnection of the second electrode at steps of bank film lying in
the vicinity of the openings thereof.