Organic light emitting display device and method of manufacturing organic light emitting display device
An organic light emitting display device includes a substrate having a luminescent region and a non-luminescent region, an insulation layer on the substrate, a first electrode on the insulation layer, at least one light emitting structure on the first electrode, a second electrode on the light emitting structure, and at least one reflecting structure at one of the first electrode or the second electrode around the at least one light emitting structure. The reflecting structure may be configured to reflect light back toward the luminescent region.
1. An organic light emitting display device comprising:
a substrate having a luminescent region and a non-luminescent region;
an insulation layer on the substrate;
a first electrode on the insulation layer;
at least one light emitting structure on the first electrode;
a second electrode on the light emitting structure; and
at least one reflecting structure buried in one of the first electrode or the second electrode around the at least one light emitting structure.
2. The organic light emitting display device of claim 1 , wherein the reflecting structure includes a material having reflectivity.
3. The organic light emitting display device of claim 2 , wherein the reflecting structure is configured to reflect light generated from the light emitting structure and reflected at an interface between the first electrode and the insulation layer toward the non-luminescent region back toward the luminescent region.
4. The organic light emitting display device of claim 2 , wherein the reflecting structure comprises at least one material selected from the group consisting of silver (Ag), platinum (Pt), chrome (Cr), tungsten (W), molybdenum (Mo), titanium (Ti), palladium (Pd), iridium (Ir), and alloys thereof.
5. The organic light emitting display device of claim 1 , wherein the reflecting structure has one of a circular ring shape, an elliptical ring shape, a track-shaped ring shape, or a polygonal ring shape.
6. The organic light emitting display device of claim 1 , wherein a cross-sectional shape of the reflecting structure is one of a truncated inverted-trapezoid shape, a truncated inverted-wedge shape, or a rounded shape directed toward the substrate.
7. The organic light emitting display device of claim 1 , wherein a sidewall of the reflecting structure has an angle of inclination in a range of about +20′ to about +70° or in a range of about −20° to about −70° with respect to a direction parallel to the substrate.
8. The organic light emitting display device of claim 1 , wherein a plurality of light emitting structures are on the first electrode, and wherein a plurality of reflecting structures corresponding to the plurality of light emitting structures are at the one of the first electrode or the second electrode.
9. The organic light emitting display device of claim 1 , wherein a plurality of light emitting structures are on the first electrode, and wherein at least one reflecting structure surrounding the plurality of light emitting structures is at the one of the first electrode or the second electrode.
10. The organic light emitting display device of claim 1 , wherein the reflecting structure protrudes from the one of the first electrode or the second electrode.
11. The organic light emitting display device of claim 1 , further comprising a switching device between the substrate and the insulation layer, the switching device electrically connected to the first electrode.
12. The organic light emitting display device of claim 1 , wherein the first electrode comprises a transparent conductive material and the second electrode comprises a material having reflectivity, and wherein the reflecting structure is at the first electrode.
13. The organic light emitting display device of claim 12 , wherein the reflecting structure and the second electrode comprise a same material.
14. The organic light emitting display device of claim 1 , wherein the first electrode comprises a material having reflectivity and the second electrode comprises a transparent conductive material, and wherein the reflecting structure is at the second electrode.
15. The organic light emitting display device of claim 14 , wherein the reflecting structure and the first electrode comprise a same material.
16. The organic light emitting display device of claim 1 , further comprising a protection layer on the second electrode, wherein the reflecting structure is configured to reflect light generated from the light emitting structure and reflected at an interface between the second electrode and the protection layer toward the non-luminescent region back toward the luminescent region.
17. A method of manufacturing an organic light emitting display device, comprising:
forming an insulation layer on a substrate;
forming a first electrode on the insulation layer;
forming at least one reflecting structure at the first electrode;
forming a pixel defining layer on the first electrode, the pixel defining layer defining a luminescent region and a non-luminescent region;
forming at least one light emitting structure on the first electrode in the luminescent region, the at least one light emitting structure being surrounded by the at least one reflecting structure; and
forming a second electrode on the at least one light emitting structure and the pixel defining layer;
wherein forming the reflecting structure comprises partially etching the first electrode adjacent to an area between the luminescent region and the non-luminescent region, and forming the reflecting structure at the etched portion of the first electrode.
18. The method of claim 17 , wherein partially etching the first electrode comprises forming at least one opening that exposes the insulation layer.
19. The method of claim 18 , wherein the opening has one of a circular ring shape, an elliptical ring shape, a track-shaped ring shape, or a polygonal ring shape, and wherein a cross-sectional shape of the opening is one of a truncated inverted-trapezoid shape, a truncated inverted-wedge shape, or a rounded shape directed toward the substrate.
20. The method of claim 19 , wherein a sidewall of the opening has an angle of inclination in a range of about +20° to about +70° or in a range of about −20° to about −70° with respect to a direction parallel to the substrate.
21. The method of claim 17 , wherein a plurality of light emitting structures are formed on the first electrode, and wherein one reflecting structure surrounding the plurality of light emitting structures is formed at the first electrode.
22. The method of claim 17 , wherein a plurality of light emitting structures are formed on the first electrode, and wherein a plurality of reflecting structures are formed at the first electrode, the plurality of reflecting structures respectively surrounding the plurality of light emitting structures.
23. A method of manufacturing an organic light emitting display device, comprising:
forming an insulation layer on a substrate;
forming a first electrode on the insulation layer;
forming a pixel defining layer on the first electrode, the pixel defining layer defining a luminescent region and a non-luminescent region;
forming at least one light emitting structure on the first electrode in the luminescent region;
forming a second electrode on the at least one light emitting structure and the pixel defining layer; and
forming at least one reflecting structure at the second electrode, the reflecting structure surrounding the at least one light emitting structure;
wherein forming the reflecting structure comprises forming at least one opening through the second electrode adjacent to an area between the luminescent region and the non-luminescent region, and forming the reflecting structure in the at least one ginning.