KR20120075055A - Organic light emitting diode display device - Google Patents

Abstract

PURPOSE: An organic electroluminescence display device is provided to prevent a penetration of external moisture by forming a planarized film or a barrier layer separated from a bank layer. CONSTITUTION: A planarized film(215) is formed on a first substrate(210). A first electrode(220) is formed on the planarized film. A bank layer(230) includes an opening part exposing the first electrode. An organic film layer(240) is formed on an upper side of the first electrode. A second electrode(250) is formed on the first substrate including the organic film layer. A protective layer(260) is formed on the second electrode.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device that can prevent external moisture from penetrating.

2. Description of the Related Art In recent years, the importance of flat panel displays (FPDs) has been increasing with the development of multimedia. Accordingly, a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an organic light emitting diode display device, etc. Many of the same flat panel displays have been put to practical use.

Among them, the organic light emitting display device is an element emitting light in the light emitting layer including organic material. The organic light emitting display device has a high response time with a response speed of 1 ms or less, low power consumption, and no self-emission. It is attracting attention as a display device.

1 is a view illustrating a conventional organic light emitting display device.

Referring to FIG. 1, in the conventional organic light emitting display device, the planarization layer 12 is positioned on the first substrate 10, and the first electrode 14 is positioned on the planarization layer 12. The bank layer 16 is positioned on the first electrode 14 to define a pixel region, the organic layer 20 is positioned on the bank layer 16, and the second electrode 22 is disposed on the organic layer 20. This is located. In addition, the auxiliary electrode 18 connected to the second electrode 22 is positioned at the edge of the first substrate 10, and the passivation layer 24 protecting the second electrode 22 is positioned. The second substrate 28 is bonded to the first substrate 10 through the adhesive layer 26 to form an organic light emitting display device.

However, a region made of organic material of the organic light emitting display device serves as a passage through which external moisture penetrates. That is, the interface between the second substrate 28 and the adhesive layer 26, the interface between the adhesive layer 26, and the first substrate 28 and the adhesive layer 26 act as a passage through which external moisture penetrates.

In particular, the region A of the planarization film 12 and the region B of the bank layer 16, which serve as passages through which moisture penetrates, are integrated with the inside of the device to act as a passage through which moisture easily penetrates into the inside of the device. Accordingly, the moisture penetrated into the device penetrates into the organic film layer 20 through the planarization film 12 and the bank layer 16, thereby accelerating deterioration of the device.

The present invention provides an organic light emitting display device that can prevent external moisture from penetrating.

In order to achieve the above object, an organic light emitting display device according to an embodiment of the present invention is a first substrate, a first electrode located on the first substrate, is located on the first electrode, the first electrode A bank layer including an opening 131 exposing an electrode, an organic layer positioned on the first electrode, a second electrode positioned on a first substrate including the organic layer, and positioned on the second electrode A protective layer, an adhesive layer positioned on the protective layer, a second substrate positioned on the adhesive layer, and a barrier layer positioned at an edge of the first substrate and made of the same material as the bank layer may be included.

The barrier layer may have a plurality of pattern shapes.

The barrier layer may surround an edge of the first substrate.

The barrier layer may be integral or separate.

The barrier layer may be spaced apart from the bank layer.

In addition, an organic light emitting display device according to an embodiment of the present invention is provided on a first substrate, a planarization layer positioned on the first substrate, a first electrode positioned on the planarization layer, and positioned on the first electrode. A bank layer including an opening exposing the first electrode, an organic layer positioned on the first electrode, a second electrode positioned on a first substrate including the organic layer, and a second electrode positioned on the second electrode A protective layer, an adhesive layer on the protective layer, a second substrate on the adhesive layer, an edge of the first substrate, and an auxiliary electrode connected to the second electrode and an edge of the first substrate. And a lower barrier layer made of the same material as the planarization layer and an upper barrier layer made of the same material as the bank layer.

The barrier layer may have a plurality of pattern shapes.

The lower barrier layer and the upper barrier layer may surround edges of the first substrate.

The lower barrier layer and the upper barrier layer may be integrated or separated, respectively.

The lower barrier layer may be spaced apart from the planarization layer, and the upper barrier layer may be spaced apart from the bank layer.

The upper barrier layer may overlap the lower barrier layer.

At least a portion of the upper barrier layer may be positioned on the auxiliary electrode.

The organic light emitting display device according to an embodiment of the present invention has an advantage of preventing a shrinkage defect in which the active region is contracted by the penetration of external moisture by forming a barrier layer spaced apart from the planarization layer or the bank layer.

1 is a view showing a conventional organic light emitting display device.
2 is a diagram illustrating an organic light emitting display device according to a first embodiment of the present invention.
3 is a view showing a barrier layer according to a first embodiment of the present invention.
4 is a diagram illustrating an organic light emitting display device according to a second embodiment of the present invention.
FIG. 5A is a diagram illustrating a shrinkage failure of a conventional organic light emitting display device, and FIG. 5B is a view illustrating a shrinkage failure of an organic light emitting display device of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view showing an organic light emitting display device according to a first embodiment of the present invention, and FIG. 3 is a view showing a barrier layer according to a first embodiment of the present invention.

Referring to FIG. 2, the organic light emitting display device 100 according to the present invention includes a first substrate 110, a first electrode 120 and a first electrode 120 positioned on the first substrate 110. A bank layer 130 including an opening 131 exposing the first electrode 120, an organic layer 140, and an organic layer 140 disposed on the first electrode 120. A second electrode 150 positioned on the first substrate 110, a protective layer 160 positioned on the second electrode 150, and an adhesive layer positioned on the protective layer 160. 180 and a second substrate 170 positioned on the adhesive layer 180.

The first substrate 110 may be a transparent substrate made of glass, plastic, or a conductive material. On the first substrate 110, a buffer layer such as silicon oxide (SiO ₂ ), silicon nitride (SiNx), or the like is further added to protect the device formed in a subsequent process from impurities such as alkali ions flowing out of the first substrate 110. It may include.

The first electrode 120 may be an anode and may be a transparent electrode. The first electrode 120 is made of any one of indium tin oxide (ITO), indium zinc oxide (IZO), and zinc oxide (ZnO). The first electrode 120 may be formed using a sputtering method, an evaporation method, a vapor phase deposition method, or an electron beam deposition method.

The bank layer 130 includes an opening 131 defining a pixel area by exposing a portion of the first electrode 120. The bank layer 130 is made of organic materials such as polyimide, benzocyclobutene series resin, and acrylate.

The organic layer 140 is positioned on the first electrode 120 exposed by the opening 131 of the bank layer 130. The organic layer 140 includes at least a light emitting layer, and includes at least one of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.

The hole injection layer may play a role of smoothly injecting holes from the first electrode 120 to the light emitting layer, and may include CuPc (cupper phthalocyanine), PEDOT (poly (3,4) -ethylenedioxythiophene), and PANI (polyaniline). And NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine), but may be made of any one or more selected from the group consisting of, but is not limited thereto.

The hole transport layer serves to facilitate the transport of holes, NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine), TPD (N, N'-bis- (3-methylphenyl) -N, N at least one selected from the group consisting of '-bis- (phenyl) -benzidine), s-TAD and MTDATA (4,4', 4 "-Tris (N-3-methylphenyl-N-phenyl-amino) -triphenylamine) It may be made of but is not limited thereto.

The emission layer may be formed of a material emitting red, green, and blue, and may be formed using phosphorescent or fluorescent materials.

When the light emitting layer is red, CBP (carbazole biphenyl) or mCP (1,3-bis (carbazol-9-yl) containing a host material comprising, PIQIr (acac) (bis (1-phenylisoquinoline) acetylacetonate iridium) , PQIr (acac) (bis (1-phenylquinoline) acetylacetonate iridium), PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) as a phosphor containing a dopant including any one or more selected from the group consisting of Alternatively, the present invention may be made of a fluorescent material including PBD: Eu (DBM) ₃ (Phen) or perylene, but is not limited thereto.

When the light emitting layer is green, it may include a host material including CBP or mCP and a phosphor including a dopant material including Ir (ppy) 3 (fac tris (2-phenylpyridine) iridium). Alternatively, it may be made of a fluorescent material including Alq3 (tris (8-hydroxyquinolino) aluminum), but is not limited thereto.

When the light emitting layer is blue, the phosphor may include a host material including CBP or mCP and a dopant material including (4,6-F ₂ ppy) ₂ Irpic. It may be made of a fluorescent material including any one selected from the group consisting of DPVBi, spiro-6P, distilbenzene (DSB), distriarylene (DSA), PFO-based polymer and PPV-based polymer, but is not limited thereto.

The electron transport layer serves to facilitate the transport of electrons, but may be made of any one or more selected from the group consisting of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq and SAlq. It is not limited. The electron injection layer serves to facilitate the injection of electrons, and may be Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq or SAlq, but is not limited thereto.

The second electrode 150 may be a cathode electrode, and may be made of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), or an alloy thereof having a low work function. Here, the second electrode 150 may be formed to be thick enough to reflect light so that the light emitted from the light emitting layer can be emitted to the first electrode 120.

The passivation layer 160 positioned on the second electrode 150 serves to protect the devices therein and may be formed of an inorganic layer. The passivation layer 160 may include, for example, any one or more selected from the group consisting of metal, metal oxide, metal nitride oxide, silicon oxide (SiO ₂ ), and silicon nitride (SiNx). The metal may include Al, Ag, Cu, Au, and the like, and the metal oxide may be Al ₂ O ₃ or CuO.

The second substrate 170 is bonded to the first substrate 110 by the adhesive layer 180. The second substrate 170 is made of a metal or transparent glass substrate, and the adhesive layer 180 is made of an adhesive resin such as an acrylic resin and an epoxy resin.

Meanwhile, the present invention includes a plurality of barrier layers 135 at the edge of the first substrate 110. The barrier layer 135 is formed at the same time as the bank layer 130 is formed, and is made of the same material as the bank layer 130. The barrier layer 135 is spaced apart from the bank layer 130, thereby blocking a path through which external moisture penetrates. In this case, the distance between the barrier layer 135 and the bank layer 130 is not particularly limited.

Referring to FIG. 3A, the barrier layer 135 of the present invention surrounds an edge of the first substrate 110 and is positioned in a shape surrounding an active region. The barrier layer 135 may be formed in a plurality of pattern shapes, as shown in the figure. On the other hand, referring to FIG. 3B, the barrier layer 135 of the present invention completely surrounds the edge of the first substrate 110 and may be positioned in a shape surrounding the active region. In this case, the barrier layer 135 may be formed of a plurality of donuts, each of which is integrally formed.

In the drawings of the present invention, the barrier layer 135 is formed of three patterns, respectively, but is not limited thereto, and the number of patterns of the barrier layer 135 may be at least one. In addition, although the barrier layer 135 patterns are shown as being spaced apart from each other by the same distance, the spaced apart distance of the barrier layer 135 pattern is not particularly limited, may be spaced apart by the same distance, may be spaced apart from each other. .

As described above, the organic light emitting display device according to the first exemplary embodiment of the present invention has an advantage of preventing external moisture from penetrating into the device by forming the barrier layer 135 spaced apart from the bank layer. .

Meanwhile, the organic light emitting display device according to the first embodiment of the present invention has been described with respect to the organic light emitting display device having a bottom emission structure in which light emitted from the light emitting layer is emitted toward the first substrate. Hereinafter, an organic light emitting display device having a top emission structure will be described.

4 is a diagram illustrating an organic light emitting display device according to a second embodiment of the present invention. Hereinafter, a description of the same configuration as that of the organic light emitting display device according to the first embodiment of the present invention will be omitted.

Referring to FIG. 4, the organic light emitting display device 200 according to the present invention includes a first substrate 210, a planarization layer 215 disposed on the first substrate 210, and a planarization layer 215. The bank layer 230 and the first electrode 220 including a first electrode 220 positioned on the first electrode 220 and an opening 231 exposing the first electrode 220. ) An organic layer 240 disposed on the substrate, a second electrode 250 disposed on the first substrate 210 including the organic layer 240, and a protective layer disposed on the second electrode 250. 260, an adhesive layer 280 disposed on the protective layer 260, a second substrate 270 located on the adhesive layer 280, and an edge of the first substrate 210. The auxiliary electrode 255 is connected to the second electrode 250.

The planarization layer 215 positioned on the first substrate 210 serves to planarize the stepped portion of the lower portion. Although not illustrated, a thin film transistor may be positioned on the first substrate 210. The planarization film 215 is made of organic materials such as polyimide, benzocyclobutene series resin, and acrylate.

The first electrode 220 may be an anode electrode, and may be a reflective electrode reflecting light emitted from the emission layer upwards. The first electrode 121 may further include a reflective layer made of any one of aluminum (Al), silver (Ag), or nickel (Ni) under the layer made of any one of ITO, IZO, or ZnO, and in addition, ITO , The reflective layer is interposed between two layers made of any one of IZO and ZnO.

The second electrode 250 may be a cathode electrode, and may be made of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), or an alloy thereof having a low work function. Here, the second electrode 250 may be a transmissive electrode that transmits light emitted from the light emitting layer, and may be formed to a thickness thin enough to transmit light.

The auxiliary electrode 255 connected to the second electrode 250 is an auxiliary electrode 255 for preventing the voltage drop of the second electrode 250 and is made of the same material as the first electrode 220. The auxiliary electrode 255 is positioned at the edge of the first substrate 210 and electrically connected to the second electrode 250.

Meanwhile, the present invention includes a plurality of lower barrier layers 217 and upper barrier layers 235 at edges of the first substrate 210. The lower barrier layer 217 is formed at the same time as the planarization layer 215 and is made of the same material as the planarization layer 215. The lower barrier layer 217 is spaced apart from the planarization layer 215 to block a path through which external moisture penetrates. In this case, the distance between the lower barrier layer 217 and the planarization layer 215 is not particularly limited.

In addition, as shown in FIGS. 3A and 3B, the lower barrier layer 217 has the same shape as the barrier layer 135 of the first embodiment described above. That is, the lower barrier layer 217 surrounds the edge of the first substrate 110 and is positioned in a shape surrounding the active region. In addition, the lower barrier layer 217 may have a plurality of pattern shapes or a donut shape, each of which is integrally formed.

The upper barrier layer 235 is formed at the same time as the bank layer 230 and is made of the same material as the bank layer 230. The upper barrier layer 235 is spaced apart from the bank layer 230, thereby blocking a path through which external moisture penetrates. In this case, the distance between the upper barrier layer 235 and the bank layer 230 is not particularly limited.

In addition, as shown in FIGS. 3A and 3B, the upper barrier layer 235 has the same shape as the barrier layer 135 of the first embodiment described above. That is, the upper barrier layer 235 surrounds the edge of the first substrate 110 and is positioned in a shape surrounding the active region. In addition, the upper barrier layer 235 may be formed of a plurality of pattern shapes or a donut shape each of which is integral.

The lower barrier layer 217 and the upper barrier layer 235 are partially overlapped with each other. That is, the upper barrier layer 235 overlaps the lower barrier layer 217. If the lower barrier layer 217 and the upper barrier layer 235 do not overlap, an upper barrier layer 235 is formed between the lower barrier layer 217, so that the lower barrier layer 217 and the upper barrier layer ( 235 is integrated. Accordingly, the lower barrier layer 217 and the upper barrier layer 235 can act as a movement passage of moisture. Therefore, in the present invention, the lower barrier layer 217 and the upper barrier layer 235 are formed to overlap each other.

In the region where the auxiliary electrode 255 is located, the auxiliary electrode 255 is formed to include the lower barrier layer 217, and a part of the upper barrier layer 235 is positioned on the auxiliary electrode 255. In the region where the auxiliary electrode 255 is not located, the upper barrier layer 235 overlaps the lower barrier layer 217 as described above.

As described above, in the organic light emitting display device according to the second embodiment of the present invention, the lower barrier layer spaced apart from the planarization layer and the upper barrier layer spaced apart from the bank layer are formed to overlap each other, thereby preventing external moisture into the device. There is an advantage that can prevent the penetration.

FIG. 5A is a view showing that a shrinkage failure of a conventional organic light emitting display device is generated, and FIG. 5B is a view showing that shrinkage failure of an organic light emitting display device of the present invention does not occur.

Referring to FIG. 5A, it can be seen that in the conventional organic light emitting display device having the structure of FIG. 1 described above, moisture is penetrated into the outside of the panel to cause shrinkage defects in which pixels adjacent to the outside of the panel do not emit light. On the other hand, referring to FIG. 5B, it can be seen that the organic light emitting display device manufactured according to the first embodiment of the present invention does not cause shrinkage defects in pixels adjacent to the outside of the panel.

As described above, the organic light emitting display device according to an embodiment of the present invention forms a barrier layer spaced apart from the planarization layer or the bank layer, thereby preventing shrinkage defects in which external moisture penetrates and shrinks the active region. There is an advantage.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

Claims (12)

A first substrate;
A first electrode on the first substrate;
A bank layer on the first electrode and including an opening 131 exposing the first electrode;
An organic layer disposed on the first electrode;
A second electrode on the first substrate including the organic layer;
A protective layer on the second electrode;
An adhesive layer on the protective layer;
A second substrate on the adhesive layer; And
An organic light emitting display device positioned at an edge of the first substrate and including a barrier layer formed of the same material as the bank layer.
The method of claim 1,
The barrier layer has an organic light emitting display device having a plurality of pattern shapes.
The method of claim 1,
The barrier layer is an organic light emitting display device surrounding an edge of the first substrate.
The method of claim 3,
The barrier layer is an organic light emitting display device of one type or separated type.
The method of claim 1,
The barrier layer is an organic light emitting display device spaced apart from the bank layer.
A first substrate;
A planarization layer on the first substrate;
A first electrode on the planarization film;
A bank layer on the first electrode, the bank layer including an opening exposing the first electrode;
An organic layer disposed on the first electrode;
A second electrode on the first substrate including the organic layer;
A protective layer on the second electrode;
An adhesive layer on the protective layer;
A second substrate on the adhesive layer;
An auxiliary electrode positioned at an edge of the first substrate and connected to the second electrode; And
An organic light emitting display device positioned at an edge of the first substrate and including a lower barrier layer made of the same material as the planarization layer and an upper barrier layer made of the same material as the bank layer.
The method according to claim 6,
The barrier layer has an organic light emitting display device having a plurality of pattern shapes.
The method according to claim 6,
The lower barrier layer and the upper barrier layer surround an edge of the first substrate.
The method of claim 8,
And the lower barrier layer and the upper barrier layer are integrated or separated, respectively.
The method according to claim 6,
The lower barrier layer is spaced apart from the planarization layer, and the upper barrier layer is spaced apart from the bank layer.
The method according to claim 6,
The upper barrier layer overlaps the lower barrier layer.
The method according to claim 6,
The upper barrier layer is at least partially disposed on the auxiliary electrode.

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