Methods of forming inclined structures on insulation layers, organic light emitting display devices and methods of manufacturing organic light emitting display devices
An organic light emitting display device comprises a first substrate, an insulation layer having an inclined structure, a first electrode, a pixel defining layer defining a luminescent region and a non-luminescent region, an organic light emitting structure, a second electrode and a second substrate. Lateral portions of the first electrode, the second electrode and/or the pixel defining layer may have an inclination angle for preventing a total reflection of light generated from the organic light emitting structure, so that the organic light emitting display device may ensure a light efficiency substantially larger than that of the conventional organic light emitting display device by about at least 30 percent.
1. An organic light emitting display device comprising:
a first substrate;
an insulation layer on the first substrate, the insulation layer comprising an inclined structure;
a first electrode on the insulation layer;
a pixel defining layer on the insulation layer and the first electrode, the pixel defining layer defining a luminescent region and a non-luminescent region;
an organic light emitting structure on the first electrode in the luminescent region and having an entire upper surface that is planar;
a second electrode on the pixel defining layer and the organic light emitting structure; and
a second substrate on the second electrode,
wherein the pixel defining layer extends on a portion of the first electrode positioned on a sidewall of the inclined structure, and
wherein a sidewall of the inclined structure has an inclination angle the same as an inclination angle of a sidewall of the organic light emitting structure.
2. The organic light emitting display device of claim 1 , wherein the pixel defining layer extends on the first electrode positioned on an upper face of the inclined structure, and the pixel defining layer has an opening exposing the first electrode in the luminescent region.
3. The organic light emitting display device of claim 2 , wherein the organic light emitting structure is disposed in the opening of the pixel defining layer.
4. The organic light emitting display device of claim 3 , wherein the sidewall of the organic light emitting structure has an inclination angle of about 110° to about 160° relative to a direction in parallel to the first substrate.
5. The organic light emitting display device of claim 1 , wherein the sidewall of the inclined structure has an inclination angle of about 20° to about 70° relative to a direction parallel to the first substrate.
6. The organic light emitting display device of claim 5 , wherein each of lateral portions of the first and the second electrodes on the inclined structure has an inclination angle the same as the inclination angle of the sidewall of the inclined structure.
7. The organic light emitting display device of claim 1 , wherein the insulation layer has a plurality of protrusions on the inclined structure.
8. The organic light emitting display device of claim 7 , wherein the first electrode has a plurality of protruding portions formed on the plurality of protrusions, respectively.
9. The organic light emitting display device of claim 8 , wherein the organic light emitting structure has a plurality of portions divided by the protruding portions of the first electrode.
10. The organic light emitting display device of claim 1 , wherein the inclined structure has a recessed shape.