Display unit having insulating film with tapered portions
A display unit capable of preventing breaking of a second electrode and decreasing a leakage current through an organic layer is provided. The display unit includes a plurality of organic light emitting devices over a flat substrate. Each of the plurality of organic light emitting devices has a first electrode, an insulating film having an aperture correspondingly to the first electrode, an organic layer formed at least on the first electrode in the aperture and composed of a plurality of layers including a light emitting layer, and a second electrode sequentially. The insulating film has a low taper section having a tilt angle formed by a side face of the aperture and a flat face of the substrate that is smaller than a tilt angle of the other section of a circumference of the aperture in part of the circumference of the aperture.
1. A display unit comprising:
a plurality of organic light emitting devices over a flat substrate with a flat face defining a major surface, each of the plurality of organic light emitting devices having (a) a first electrode, (b) an insulating film having an aperture exposing the first electrode, (c) an organic layer at least on the first electrode in the aperture, the organic layer having a plurality of layers including a light emitting layer, and (d) a second electrode on the organic layer in the aperture,
wherein,
the aperture in the insulating film has (i) a planar shape having a plurality of sides, (ii) a first taper portion tapered with a first tilt angle, the first tilt angle defined by a first side face portion of the aperture and the flat face of the substrate, and (iii) a second taper portion tapered with a second tilt angle that is smaller and more acute than the first tilt angle, the second tilt angle defined by a second side face portion of the aperture and the flat face of the substrate, the plurality of sides of the aperture including sides having only the first taper portion formed therein and at least one other side having the second taper portion formed therein, the first taper portion provided so as to decrease a leakage current through the organic layer and the second taper portion provided so as to prevent a non-conduction of the second electrode.
2. The display unit according to claim 1 , wherein:
the plurality of sides of the aperture include a side on which a no-organic-layer region not formed with the organic layer exists between the aperture and an adjacent aperture, and
the second taper portion is formed in the side on which the no-organic-layer region exists.
3. The display unit according to claim 1 , wherein two second taper portions are formed in two opposed sides of the aperture, respectively.
4. The display unit according to claim 1 , wherein:
the plurality of sides of the aperture include a side on which an organic layer overlap region exists between the aperture and an adjacent aperture, and
the second taper portion is formed in the side on which the organic layer overlap region exists.