KR20220064359A - Organic light emitting display device - Google Patents

Abstract

An organic light emitting display device according to an embodiment of the present invention includes an organic light emitting element on a substrate, a protective layer on the organic light emitting element, and a barrier layer on the protective layer. Since the protective layer is configured to include a retardation layer and a linear polarizer is disposed on the barrier layer, the thickness of the organic light emitting display device can be reduced compared to an organic light emitting display device including a circular polarizer and bending with a low curvature can be realized.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device having a reduced thickness and capable of bending or folding with a low curvature.

The organic light emitting diode display (OLED) is a self-emission type display device, and unlike a liquid crystal display device (LCD), it does not require a separate light source, so it can be manufactured in a lightweight and thin form. In addition, the organic light emitting diode display is being studied as a next-generation display because it is advantageous in terms of power consumption due to low voltage driving, and has excellent color realization, response speed, viewing angle, and contrast ratio (CR).

An organic light emitting diode display displays an image using light emitted from an organic light emitting diode connected to a thin film transistor in each pixel area.

A device that forms an organic light emitting layer made of an organic material between an anode and a cathode and emits light by applying an electric field. It can be driven at a low voltage, consumes relatively little power, and is lightweight and flexible. It has the feature that it can be manufactured on the upper part as well.

Recently, a polarizer has been applied to one side of the organic light emitting diode display to secure visibility due to external light reflection.

External light visibility of an organic light emitting diode display is defined by an ambient contrast ratio (ACR). Currently, a circular polarizer is applied to an organic light emitting display to improve the ACR of the organic light emitting display.

In the case of a conventional organic light emitting display device, after an organic light emitting device is fabricated on a substrate on which a thin film transistor (TFT) is formed, a multi passivation layer formed of a plurality of organic and inorganic layers is formed thereon. is formed as a protective layer, and a barrier film and a circular polarizer are attached thereon through a lamination process to manufacture an organic light emitting diode display.

In the case of a circular polarizer as described above, a plurality of optical films are laminated and adhered, and since it is manufactured in the form of a film, it is difficult to manufacture it in a thin form. A current thin circular polarizer has a thickness of about 150 μm.

In the case of a plastic organic light emitting display panel for realization of flexibility to which a conventional circular polarizer is applied, since it is impossible to make a circular polarizer thin, when a low curvature of 3R or less is implemented, the circular polarizer is Defects in the organic light emitting display device by causing cracks while stress generated from the transmission is transferred to the inorganic layer of the multi passivation layer on the lower organic light emitting device or the inorganic layer of the thin film transistor (TFT) may increase the likelihood of

As the overall thickness of the organic light emitting display device to which the circular polarizer is applied increases, it is difficult to implement a flexible function such as bending or folding in the organic light emitting display device.

In addition, the circular polarizer has a very high price and occupies a large proportion in the material cost of the organic light emitting diode display, and thus improvement is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide an organic light emitting diode display having a reduced thickness in the organic light emitting diode display.

Another problem to be solved by the present invention is to reduce the thickness of the organic light emitting diode display in the organic light emitting display device, thereby enabling flexible implementation such as bending or folding with a low curvature. is to provide

Another object of the present invention is to provide an organic light emitting diode display capable of improving the performance of preventing moisture permeation into the organic light emitting diode.

The problems to be solved according to the embodiment of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to the organic light emitting display device according to an embodiment of the present invention, an organic light emitting display device having a reduced thickness and capable of bending or folding with a low curvature is provided.

An organic light emitting diode display according to an embodiment of the present invention includes an organic light emitting diode on a substrate, a passivation layer on the organic light emitting element, and a barrier layer on the passivation layer, the passivation layer is configured to include a retardation layer, and a linear polarizing plate is formed on the barrier layer (a linear polarizer) is disposed to reduce the thickness compared to an organic light emitting diode display including a circular polarizer, and is an organic light emitting diode display capable of bending with a low curvature.

The passivation layer may further include a first passivation layer and a second passivation layer, and the retardation layer may be disposed between the first passivation layer and the second passivation layer.

The retardation layer may be a λ/4 retardation layer.

The first passivation layer and the second passivation layer may be formed of an inorganic layer.

The retardation layer may be disposed after the liquid material is coated on the first protective layer and then cured.

The retardation layer may be laminated on the first protective layer in the form of a film.

* The inorganic layer may be made of silicon nitride (SiNx).

The passivation layer further includes a first passivation layer, a second passivation layer, and a third passivation layer, and the retardation layer includes a first retardation layer and a second passivation layer and a third retardation layer disposed between the first passivation layer and the second passivation layer. A second retardation layer disposed between the passivation layers may be included.

The passivation layer may further include a fourth passivation layer, and the retardation layer may further include a third retardation layer disposed between the third passivation layer and the fourth passivation layer.

The organic light emitting diode display may further include a touch substrate disposed between the barrier layer and the linear polarizer.

The thickness of the linear polarizing plate may be 100 μm or less.

In another aspect, an organic light emitting diode display according to an embodiment of the present invention includes an organic light emitting diode, a passivation layer disposed on the organic light emitting element, and a polarizing plate on the passivation layer, and the passivation layer includes at least one λ/4 retarder layer. It is characterized in that it is an organic light emitting display device including a dation layer.

The polarizer may be a linear polarizer.

The passivation layer may include a plurality of λ/4 retardation layers, and the passivation layer may further include a plurality of inorganic layers disposed between the plurality of λ/4 retardation layers.

The plurality of λ/4 retardation layers are implemented by any one of screen printing, ink-jet coating, gravure printing, and offset printing on the inorganic film. can be

The protective layer may prevent moisture permeation into the organic light emitting diode.

In another aspect, a plastic OLED panel according to an embodiment of the present invention includes a multi-passivation structure and a multi-passivation structure in which the λ/4 retardation layer of a conventional circular polarizing plate is integrated into a foreign material prevention layer (PCL). ) is a plastic OLED panel including a linear polarizing plate having a thin-film type structure with a thickness of 100 μm or less on the structure.

The λ/4 retardation layer integrated into the foreign material prevention layer (PCL) may harden a liquid material capable of lamination or coating process.

In the multi-passivation multi-passivation structure, inorganic layers may be respectively stacked on the upper and lower surfaces of the λ/4 retardation layer integrated with the PCL.

A linear polarizing plate having a stacked multi-passivation structure and a thin-film structure may have a curvature shape of 3R or less.

In an organic light emitting display device, at least one layer of a multi passivation layer that is a protective layer of an organic light emitting diode is configured to include a retardation layer, which is a λ/4 retardation layer, and a linear polarizing plate By applying the (linear polarizer), the thickness of the organic light emitting diode display can be reduced compared to the case where the circular polarizer is applied.

Also, according to the present invention, the thickness of the organic light emitting display is reduced by applying a linear polarizer as described above in the organic light emitting display, so that bending or folding with a low curvature of 3R or less in the organic light emitting display is performed ( A flexible implementation such as folding) is possible.

In addition, according to the present invention, by applying a plurality of inorganic layers to a multi passivation layer in an organic light emitting diode display, the performance of preventing moisture permeation into the organic light emitting diode can be further improved.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Since the content of the invention described in the problems to be solved above, the means for solving the problems, and the effects do not specify the essential characteristics of the claims, the scope of the claims is not limited by the matters described in the content of the invention.

1 is a diagram schematically illustrating a cross-sectional structure of a circular polarizing plate of a conventional organic light emitting diode display.
2 is a diagram illustrating a cross-sectional structure of an organic light emitting diode display according to an exemplary embodiment.
3 is a diagram illustrating a cross-sectional structure of an organic light emitting diode display according to another exemplary embodiment of the present invention.
4 is a diagram illustrating a cross-sectional structure of an organic light emitting diode display according to another exemplary embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be embodied in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description. In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

Also, although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

* Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each embodiment may be independently implemented with respect to each other or implemented together in a related relationship You may.

Hereinafter, an organic light emitting display device and a method of manufacturing the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram schematically illustrating a cross-sectional structure of a circular polarizing plate of a conventional organic light emitting diode display.

In the case of a conventional organic light emitting diode display, as shown in FIG. 1 , a circular polarizer is applied to the organic light emitting display to improve visibility of external light.

That is, after an organic light emitting device is manufactured on a substrate on which a thin film transistor (TFT) is formed, a multi passivation layer composed of a plurality of organic and inorganic layers is formed as a protective layer thereon, A barrier film and a circular polarizing plate 10 were attached thereon through a lamination process.

Referring to FIG. 1 , the circular polarizing plate 10 includes a first adhesive layer (1 ^st PSA, 11), a retardation layer (12), a second adhesive layer (2 ^nd PSA, 13), a lower TAC (14), and a linear polarizing plate (15). ), an upper TAC (16) and a hard coating layer (17).

The first adhesive layer (1 ^st PSA, 11) and the second adhesive layer (2 ^nd PSA, 13) are pressure sensitive adhesives attached to the upper and lower portions of the retardation layer 12, and in the circular polarizing plate 10 It is bonded to the included retardation layer 12 and the linear polarizing plate 15 to serve to be fixed to the organic light emitting display device.

The retardation layer 12 has a central axis at an angle of 45 degrees with the central axis of the polarizing plate 10, and a λ/4 retardation layer that retards the phase of light passing through the retardation layer 12 by λ/4. ) can be The retardation layer 12 may include a polycarbonate series.

In addition, the linear polarizing plate 15 is formed by adsorbing halogen salt crystals such as iodine to a poly-vinyl alcohol (PVA) film and then stretching the PVA film in a specific direction so that the iodine crystals are aligned in the stretching direction. .

The iodine crystal may achieve a polarization function by absorbing light incident in the first direction and transmitting light incident in a second direction perpendicular to the first direction.

The lower TAC 14 and the upper TAC 16 are films that support and protect the linear polarizing plate 15, and the constituent materials thereof should be optically transparent, should not cause birefringence, have heat resistance, and have high mechanical strength. The linear polarizing plate 15 must have a characteristic capable of physically supporting and protecting it.

In addition, it must have a wide surface and properties to be in good contact with adhesives or pressure-sensitive adhesives. For example, acetate-based resins such as triacetyl cellulose (TAC), polyester-based resins, polyimide-based resins, and polyolefin-based resins Resin, acrylic resin, polynorbornene-type resin, etc. are mentioned. Considering polarization characteristics and durability, it is most preferable to use a triacetyl cellulose (TAC) film whose surface is saponified with alkali or the like.

The hard coating layer 17 is positioned on the circular polarizing plate 10 to protect the polarizing plate 10 and to prevent the circular polarizing plate 10 from being damaged by an external physical force. That is, the hard coating layer 17 is formed at the outermost portion of the organic light emitting display device to protect the circular polarizer 10 and a plurality of layers sequentially formed under the circular polarizer 10 .

In the conventional plastic organic light emitting display device for realizing flexible as described above, the circular polarizing plate 10 is configured in a form in which a plurality of optical films are laminated and adhered, and is formed in a film form. Since it is manufactured, it is difficult to manufacture it in a thin form. The current thin circular polarizing plate 10 has a thickness of about 150 μm.

In the case of a plastic organic light emitting display panel for implementing a flexible implementation to which the conventional circular polarizing plate 10 is applied, since the circular polarizing plate 10 cannot be thin, when a low curvature of 3R or less is implemented, the circular polarizing plate 10 ) is transferred to the inorganic layer of the lower multi-passivation layer or the inorganic layer of the thin film transistor (TFT) to induce cracks, thereby reducing the possibility of defects in the organic light emitting diode display. can rise

As the overall thickness of the plastic organic light emitting display device to which the circular polarizing plate 10 is applied increases as described above, it is difficult to implement flexible such as bending or folding in the organic light emitting display device. there is.

2 is a diagram illustrating a cross-sectional structure of an organic light emitting diode display according to an exemplary embodiment.

Referring to FIG. 2 , a plastic organic light emitting display device 100 for realizing flexible according to an embodiment of the present invention includes a lower substrate 110 and a thin film transistor positioned on the lower substrate 110 ( Thin Film Transistor, 120, an organic light emitting device 130 including an organic light emitting layer (Emission Layer) located between the first electrode (anode) and the second electrode (cathode) on the thin film transistor 120, and made of a multi-layered organic material (Emission Layer), A passivation layer (140) which is a protective layer positioned on the organic light emitting device 130, a barrier layer (150) positioned on the passivation layer (140), a touch positioned on the barrier layer (150) It is configured to include a linear polarizing plate 170 positioned on the substrate 160 and the touch substrate 160 .

In the organic light emitting diode display 100 according to the embodiment of the present invention, the lower substrate 110 is not only a glass substrate, but also PET (Polyethylen terephthalate), PEN (Polyethylen naphthalate), and polyether for flexible implementation. It may be formed of a plastic substrate such as polyimide.

A buffer layer for blocking penetration of impure elements may be provided on the lower substrate 110 . The buffer layer may be formed of, for example, a single-layer or multi-layer structure of silicon nitride (SiNx) or silicon oxide (SiOx).

In the organic light emitting diode display 100 according to the embodiment of the present invention, the thin film transistor 120 configured on the lower substrate 110 includes a gate electrode, a gate insulating layer, a semiconductor layer, and a source electrode and a drain electrode. can be In addition, a passivation layer and a planarization layer disposed on the thin film transistor 120 may be included.

More specifically, the gate electrode of the thin film transistor 120 transmits a gate signal to the thin film transistor, and Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo , Ti, W, and at least one metal or alloy of Cu, may be formed as a single layer or a plurality of layers. The gate insulating layer may be made of an inorganic insulating material such as SiOx or SiNx.

In addition, the semiconductor layer may be made of a metal oxide, for example, any one of Indium Galium Zinc Oxide (IGZO), Zinc Tin Oxide (ZTO), and Zinc Indium Oxide (ZIO), but is not limited thereto, and amorphous silicon (Amorphous silicon) ) or polysilicon.

In addition, the source electrode and the drain electrode electrically connected to the semiconductor layer may be formed of a high-melting-point metal such as chromium (Cr) or tantalum (Ta).

In addition, the protective layer and the planarization layer of the thin film transistor 120 may be made of an organic or inorganic film having a hydrophobic property, for example, polystyrene, siloxane series resin, acrylic resin (Acrylic). Resin), SiON, silicon nitride (SiNx), silicon oxide (SiOx), may be formed of any one of aluminum oxide (AlOx).

Also, referring to FIG. 2 , in the organic light emitting diode display 100 according to the embodiment of the present invention, the organic light emitting device 130 is configured to be connected to the thin film transistor 120 on the thin film transistor 120 , and a first electrode (anode) and the second electrode (cathode) and the first electrode (anode) and the second electrode (cathode) positioned between the organic light emitting layer made of a multi-layered organic material may be included.

Also, referring to FIG. 2 , the organic light emitting device 130 includes an organic light emitting layer including a red light emitting layer 130a emitting red light, a green light emitting layer 130b emitting green light, and a blue light emitting layer 130c emitting blue light. may include

The first electrode of the organic light emitting diode 130 supplies a current (or voltage) to the organic light emitting layer and defines a light emitting area of a predetermined area.

More specifically, the first electrode disposed on the protective layer and the planarization layer of the thin film transistor 120 has a relatively large work function value to serve as an anode (anode), and a transparent conductive material, for example, ITO (Indium Tin Oxide) ) or a metal oxide such as Indium Zinc Oxide (IZO), a mixture of a metal and oxide such as ZnO:Al or SnO2:Sb, carbon nanotubes, graphene, and silver nanowires.

When the organic light emitting diode display is a top emission type, a metal material having excellent reflection efficiency, for example, aluminum (Al), silver (Ag) and A reflective electrode such as an alloy thereof may be further formed as an auxiliary electrode.

In describing the embodiment of the present invention, the top emission method refers to a method in which light emitted from the organic light emitting layer is emitted in the direction of the linear polarizing plate 170 , and the bottom emission method refers to a top emission method It refers to a method in which light is emitted in a direction opposite to that of the lower substrate 110 .

Also, a bank is formed on the first electrode to form an opening by overlapping the first electrode and an edge, exposing a part of the first electrode. The bank defines a light emitting area of the organic light emitting diode display and prevents light leakage in the non-emission area.

The bank defines a light emitting area of the organic light emitting diode display, and includes an organic material having hydrophobicity, for example, polystyrene (Polystylene), polymethyl methacrylate (PMMA), benzocyclobuteneseries resin, siloxane-based resin. It may be made of a siloxane series resin, a silane resin, an acrylic resin, or the like.

An organic material layer including an organic light emitting layer of an organic light emitting device is formed on the bank. The organic material layer may be formed of a plurality of multilayers, for example, between the first electrode and the second electrode, a hole injection layer, a hole transport layer, an organic emission layer, an electron It may include a transport layer (Electron Transporting Layer) and an electron injection layer (Electron Injection Layer).

More specifically, the organic light emitting layer of the organic light emitting diode 130 includes a hole injection layer (HIL), a hole transporting layer (HTL), an emission layer (EML), and an electron transporting layer (electron transporting layer: ETL) and an electron injection layer (EIL).

The hole injection layer HIL is positioned on the first electrode of the organic light emitting diode 130 . The hole injection layer (HIL) may serve to facilitate hole injection, and may include HATCN and cupper phthalocyanine (CuPc), poly(3,4)-ethylenedioxythiophene (PEDOT), polyaniline (PANI), and N,N (N,N). -dinaphthyl-N,N'-diphenylbenzidine) may consist of any one or more selected from the group consisting of, but is not limited thereto.

The hole transport layer HTL is disposed on the hole injection layer HIL. The hole transport layer (HTL) serves to facilitate the transport of holes, and NPD (N,N-dinaphthyl-N,N'-diphenylbenzidine) Any one selected from the group consisting of N'-bis-(phenyl)-benzidine), s-TAD and MTDATA (4,4',4"-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine) It may be made as above, but is not limited thereto.

The organic light emitting layer (EML) is located on the hole transport layer (HTL) and is formed between the hole transport layer (HTL) and the electron transport layer (ETL) to combine the holes supplied from the first electrode and electrons supplied from the second electrode. light is emitted by

The electron transport layer ETL is disposed on the organic light emitting layer EML. The thickness of the electron transport layer (ETL) may be adjusted in consideration of electron transport characteristics. The electron transport layer ETL may serve to transport and inject electrons, and the electron injection layer EIL may be separately formed on the electron transport layer ETL.

The electron transport layer (ETL) acts to facilitate electron transport, and Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, Liq(lithium quinolate), BMB-3T, PF- It may consist of any one or more selected from the group consisting of 6P, TPBI, COT and SAlq, but is not limited thereto.

The electron injection layer (EIL) may include, but is not limited to, Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, or SAlq.

Here, the structure is not limited according to the embodiment of the present invention, and at least one of the hole injection layer (HIL), the hole transport layer (HTL), the electron transport layer (ETL), and the electron injection layer (EIL) may be omitted. there is.

In addition, it is also possible to configure the hole injection layer (HIL), the hole transport layer (HTL), the electron transport layer (ETL), and the electron injection layer (EIL) as two or more layers.

The second electrode is formed on the organic light emitting layer to provide electrons to the organic light emitting layer and serves as a cathode. The second electrode is made of a transparent conductive material, for example, the transparent conductive material may include ITO or IZO.

In addition, the second electrode may further include a thin metal film made of a metal material having a low work function on the side in contact with the organic light emitting layer 260, for example, the metal material is magnesium (Mg), silver (Ag), and alloys thereof. may include

In addition, in the case of a top emission type organic light emitting diode display, the second electrode has to have a low work function and has to satisfy translucency, so it must be formed thin. In addition, a capping layer for improving light efficiency may be additionally configured on the second electrode.

Also, referring to FIG. 2 , on the second electrode of the organic light emitting device 130 , a passivation layer 140 , which is a protective layer for protecting the organic light emitting device, and a barrier layer 150 including an adhesive layer on the passivation layer 140 are formed. can be

The passivation layer 140 is positioned on the organic light-emitting device 130 and is formed to completely cover the organic light-emitting device 130 , and an organic material layer including an organic light-emitting layer and an internal device from external moisture (H ₂ 0) or oxygen (O ₂ ). function to protect them.

Referring to FIG. 2 , the passivation layer 140 of the organic light emitting diode display 100 according to an embodiment of the present invention may be formed of a multi-passivation structure in which a plurality of layers are stacked.

That is, referring to FIG. 2 , the passivation layer 140 of the organic light emitting diode display 100 according to the embodiment of the present invention includes a first passivation layer 141 , a retardation layer 142 , and a second passivation layer 143 . may be included.

More specifically, the passivation layer 140 includes a first passivation layer 141 and a second passivation layer 143 , and the retardation layer 142 includes a first passivation layer 141 and a second passivation layer 143 . ) can be placed between That is, the first protective layer 141 and the second protective layer 143 may be stacked on the upper and lower surfaces of the retardation layer 142 , respectively.

The first passivation layer 141 and the second passivation layer 143 may be formed of an inorganic layer, for example, the first passivation layer 141 and the second passivation layer 143 may be formed of an inorganic material such as silicon nitride (SiNx). It may be made of an insulating material.

The first passivation layer 141 and the second passivation layer 143 of the passivation layer 140 may be formed by a physical vapor deposition process such as sputtering or thermal deposition, or chemical vapor deposition. It may be formed by a vapor deposition) process.

The retardation layer 142 is disposed on the first protective layer 141, is a liquid material having a λ/4 phase delay characteristic after curing, and may be made of a thermosetting or photocurable material, and after curing, a polymer chain A phase retardation characteristic of light can be exhibited by the orientation of .

The retardation layer 142 has a central axis at an angle of 45 degrees with the central axis of the linear polarizing plate 170 , and a λ/4 retardation layer that retards the phase of light passing through the retardation layer 142 by λ/4. can be

In addition, the material of the retardation layer 142 has high visible light transmittance, should be less damaged by plasma after curing, and should be selected from materials with excellent coating or printing processability.

The λ/4 retardation layer, that is, the retardation layer 142 is formed on the first protective layer 141 made of an inorganic film by screen printing, ink-jet coating, or gravure printing. , may be implemented by any one of offset printing (off-set printing).

The retardation layer 142 may be coated on the first protective layer 141 and then cured and disposed through a curing process through ultraviolet (UV) irradiation or a thermal curing process.

The retardation layer 142 is disposed after the liquid material is coated on the first protective layer 141 and then cured or laminated on the first protective layer 141 in the form of a film. it might be

The retardation layer 142 in the form of a film may be formed by a lamination process through a pressure-sensitive adhesive (PSA), and may be cured through a curing process after the lamination process, or a film that has already been cured The shape retardation layer 142 may be formed through a lamination process.

The passivation layer 140 of the organic light emitting display device according to an embodiment of the present invention including the retardation layer 142 as described above protects the organic light emitting device from foreign substances as well as the retardation effect of light passing through the retardation layer 142 . It can simultaneously perform the role of a particle cover layer (PCL) and also has an effect of preventing moisture permeation into the organic light emitting device.

That is, in the plastic organic light emitting diode display (OLED) panel according to the embodiment of the present invention, the λ/4 retardation layer of a conventional circular polarizer is integrated between the inorganic layers of the passivation layer 140 . It may be configured to include a stacked multi-passivation structure.

Also referring to FIG. 2 , a barrier layer 150 is formed on the passivation layer 140 . The barrier layer 150 of the organic light emitting diode display according to an embodiment of the present invention may have a multilayer structure including an adhesive layer 151 and a barrier film 152 , and the barrier film may be formed by a roller attachment method or It may be laminated by a vacuum bonding method.

The barrier layer 150 prevents moisture and oxygen from penetrating into the organic light emitting diode (OLED). The barrier layer 150 is formed of an inorganic insulating material such as aluminum oxide (AlOx), silicon oxynitride (SiON), silicon nitride (SiNx), silicon oxide (SiO ₂ ), benzocyclobutene, or photo acryl. It may be formed as a single layer of an organic insulating material, such as, or may be formed in a structure in which an inorganic insulating material and an organic insulating material are stacked.

Also referring to FIG. 2 , the organic light emitting diode display according to an embodiment of the present invention may include a touch substrate 160 disposed on the barrier layer 150 .

The touch substrate 160 may include a second insulating layer formed to cover a plurality of X electrodes, Y electrodes, and Y electrodes that cross each other with a first insulating layer therebetween.

The X electrode and the Y electrode of the touch board 160 are connected to the pad part by a routing wire, and the pad part is a voltage application pad or a voltage detection pad. The touch substrate 160 as described above may be driven in a mutual capacitive type in which a driving voltage is applied to the X electrode, and a voltage drop changed according to whether the Y electrode is touched is sensed.

Also, referring to FIG. 2 , a linear polarizing plate 170 is formed on the touch substrate 160 of the organic light emitting diode display according to the embodiment of the present invention.

The linear polarizing plate 170 linearly polarizes the light source incident from the outside, the light source passes through the retardation layer 142 in the passivation layer 140, and becomes circularly polarized, and the light reflected from the inside is again transferred to the retardation layer ( 142), it becomes linearly polarized, and external light is blocked by the phase difference that appears at this time, and thus serves to improve the visibility of the organic light emitting diode display.

The PVA-based resin constituting the linear polarizing plate 170 may be obtained by saponifying a polyvinyl acetate-based resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and a copolymer of vinyl acetate and another monomer copolymerizable therewith.

The linear polarizing plate 170 may be manufactured by dyeing the PVA-based film as described above with a dichroic material, crosslinking with an aqueous boric acid solution, uniaxial stretching, washing with water, and drying.

The linear polarizing plate 170 of the organic light emitting device according to the embodiment of the present invention can be manufactured to a thickness of 100 μm or less, since the lower TAC, the upper TAC, and the adhesive layer can be deleted from the components included in the conventional circular polarizing plate. Do.

This can reduce the thickness to a level of about 50% or less compared to the level of about 150 to 200 μm, which is the thickness of the conventional circular polarizer, and therefore, when the linear polarizer 170 is applied, the overall thickness of the organic light emitting diode display is greatly reduced. can do it

In addition, since the total thickness of the plastic organic light emitting display panel and the amount of stress transferred to the panel during bending or folding are proportional to each other, in order to realize low curvature flexibility, the organic light emitting display panel is A smaller thickness of the panel (OLED) is more preferable, and when the linear polarizing plate 170 having a small thickness as in the organic light emitting diode display according to the embodiment of the present invention is applied, a flexible (3R) or less curvature ( flexible) implementation is possible.

That is, in the case of the organic light emitting diode display according to the embodiment of the present invention, at least one layer of the multi passivation layer, which is a protective layer of the organic light emitting diode, includes a retardation layer, which is a λ/4 retardation layer. , and by applying a linear polarizer, the thickness of the organic light emitting diode display can be reduced compared to a case where a circular polarizer is applied.

In addition, by applying a linear polarizer as described above, the thickness of the organic light emitting diode display is reduced, so that in the organic light emitting display device, flexible such as bending or folding with a low curvature of 3R or less is realized. This is possible.

In addition, in the case of the organic light emitting diode display according to the exemplary embodiment of the present invention, by applying a plurality of inorganic layers to the multi passivation layer, the performance of preventing moisture permeation into the organic light emitting diode can be further improved.

3 is a diagram illustrating a cross-sectional structure of an organic light emitting diode display according to another exemplary embodiment of the present invention.

In describing the organic light emitting diode display according to another exemplary embodiment of the present invention, repeated detailed descriptions of the same or corresponding components as previously described will be omitted.

Referring to FIG. 3 , a plastic organic light emitting diode display 200 for implementing flexible according to another exemplary embodiment of the present invention includes a lower substrate 110 and a thin film transistor positioned on the lower substrate 110 . (Thin Film Transistor, 120), an organic light emitting device 130 including an organic light emitting layer (Emission Layer) located between the first electrode (anode) and the second electrode (cathode) on the thin film transistor 120 is made of a multi-layered organic material (Emission Layer) , a passivation layer (Passivation Layer, 240), which is a protective layer positioned on the organic light emitting device 130, a barrier layer (Barrier Layer, 150) positioned on the passivation layer 240, the barrier layer 150 positioned on It is configured to include a touch substrate 160 and a linear polarizer 170 positioned on the touch substrate 160 .

Referring to FIG. 3 , in the organic light emitting diode display 200 according to the present embodiment, the passivation layer 240 includes a first passivation layer 241 , a second passivation layer 243 , a third passivation layer 245 , and a second passivation layer 240 . It includes a first retardation layer 242 and a second retardation layer 244 , and the first retardation layer 242 is disposed between the first passivation layer 241 and the second passivation layer 243 , and the second The retardation layer 244 may be disposed between the second passivation layer 243 and the third passivation layer 245 .

In addition, the first passivation layer 241 , the second passivation layer 243 , and the third passivation layer 245 may be formed of an inorganic layer, for example, the first passivation layer 241 , the second passivation layer 243 . and the third passivation layer 245 may be formed of an inorganic insulating material such as silicon nitride (SiNx).

The first retardation layer 242 and the second retardation layer 244 are liquid materials having a λ/4 phase retardation characteristic after curing, and may be made of a thermosetting or photocurable material, and the orientation of the polymer chain after curing can represent the phase delay characteristic of light.

The central axis of the first retardation layer 242 and the second retardation layer 244 forms an angle of 45 degrees with the central axis of the linear polarizing plate 170, and the first retardation layer 242 and the second retardation layer 244 are formed. It may be a λ/4 retardation layer that retards the phase of light passing through λ/4.

The passivation layer 240 of the organic light emitting diode display according to another embodiment of the present invention including the first retardation layer 242 and the second retardation layer 244 as described above includes the first retardation layer 242 and the second retardation layer 242 . In addition to the retardation effect of light through the retardation layer 244 , the function of the foreign material blocking layer (PCL) that protects the organic light emitting device from foreign substances can be simultaneously performed, and also the effect of preventing moisture permeation into the organic light emitting device has

That is, in the case of the organic light emitting diode display according to the embodiment of the present invention, at least one layer of the multi passivation layer, which is a protective layer of the organic light emitting diode, includes a retardation layer, which is a λ/4 retardation layer. , and by applying a linear polarizer, the thickness of the organic light emitting diode display can be reduced compared to a case where a circular polarizer is applied.

In addition, by applying a linear polarizer as described above, the thickness of the organic light emitting diode display is reduced, so that in the organic light emitting display device, flexible such as bending or folding with a low curvature of 3R or less is realized. This is possible.

In addition, in the case of the organic light emitting diode display according to the exemplary embodiment of the present invention, by applying a plurality of inorganic layers to the multi passivation layer, the performance of preventing moisture permeation into the organic light emitting diode can be further improved.

4 is a diagram illustrating a cross-sectional structure of an organic light emitting diode display according to another exemplary embodiment of the present invention.

In describing the organic light emitting diode display according to another exemplary embodiment of the present invention, repeated detailed descriptions of the same or corresponding components as previously described will be omitted.

Referring to FIG. 4 , a plastic organic light emitting display device 300 for implementing flexible according to another embodiment of the present invention includes a lower substrate 110 and a thin film positioned on the lower substrate 110 . An organic light emitting device 130 including a thin film transistor 120 and an organic emission layer positioned between a first electrode and a second electrode on the thin film transistor 120 and made of a multi-layered organic material. ), a passivation layer 340 as a protective layer positioned on the organic light emitting device 130 , a barrier layer 150 positioned on the passivation layer 340 , located on the barrier layer 150 . It is configured to include a touch substrate 160 and a linear polarizer 170 positioned on the touch substrate 160 .

Also, referring to FIG. 4 , in the organic light emitting diode display 300 according to the present embodiment, the passivation layer 340 includes a first passivation layer 341 , a second passivation layer 343 , a third passivation layer 345 , and a third passivation layer 340 . 4 includes a passivation layer 347 , a first retardation layer 342 , a second retardation layer 344 , and a third retardation layer 346 , and the first retardation layer 342 is a first passivation layer 341 . ) and the second protective layer 343 , the second retardation layer 344 is disposed between the second protective layer 343 and the third protective layer 345 , and the third retardation layer 346 is It may be disposed between the third passivation layer 345 and the fourth passivation layer 347 .

In addition, the first passivation layer 341 , the second passivation layer 343 , the third passivation layer 345 , and the fourth passivation layer 347 may be formed of an inorganic layer, for example, the first passivation layer 341 . , the second passivation layer 343 , the third passivation layer 345 , and the fourth passivation layer 347 may be formed of an inorganic insulating material such as silicon nitride (SiNx).

The first retardation layer 342 , the second retardation layer 344 , and the third retardation layer 346 are liquid materials having a λ/4 phase retardation characteristic after curing, and may be made of a thermosetting or photocurable material, and after curing The phase retardation characteristic of light may be exhibited by the orientation of the polymer chain.

The first retardation layer 342 , the second retardation layer 344 , and the third retardation layer 346 have a central axis formed at an angle of 45 degrees with the central axis of the linear polarizing plate 170 , and the first retardation layer 342 . , a λ/4 retardation layer that retards the phase of light passing through the second retardation layer 344 and the third retardation layer 346 by λ/4.

The passivation layer 240 of the organic light emitting diode display according to another exemplary embodiment including the first retardation layer 342 , the second retardation layer 344 , and the third retardation layer 346 as described above includes the first The retardation layer 342, the second retardation layer 344, and the third retardation layer 346, as well as the phase delay effect of the light through the retardation layer, as well as the role of the foreign material blocking layer (PCL) to protect the organic light emitting device from foreign substances can be performed at the same time In addition, it has an effect of preventing moisture permeation into the organic light emitting diode.

That is, in the case of the organic light emitting diode display according to the embodiment of the present invention, at least one layer of the multi passivation layer, which is a protective layer of the organic light emitting diode, includes a retardation layer, which is a λ/4 retardation layer. , and by applying a linear polarizer, the thickness of the organic light emitting diode display can be reduced compared to a case where a circular polarizer is applied.

In addition, by applying a linear polarizer as described above, the thickness of the organic light emitting diode display is reduced, so that in the organic light emitting display device, flexible such as bending or folding with a low curvature of 3R or less is realized. This is possible.

In addition, in the case of the organic light emitting diode display according to the exemplary embodiment of the present invention, by applying a plurality of inorganic layers to the multi passivation layer, the performance of preventing moisture permeation into the organic light emitting diode can be further improved.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: organic light emitting display device
110: substrate
120: thin film transistor
130: organic light emitting device
140: protective layer
141: first protective layer
142: retardation layer
143: second protective layer
150: barrier layer
151: adhesive layer
152: barrier film
160: touch film
170: linear polarizer

Claims (27)

a light emitting device on a substrate;
a passivation layer disposed on the light emitting device, the passivation layer including a first protective layer, a second protective layer, and a foreign material prevention layer;
a barrier layer disposed on the passivation layer and comprising at least two layers;
a touch electrode positioned on the barrier layer; and
and a polarizing plate positioned on the touch electrode.
According to claim 1,
The foreign material preventing layer is disposed on the first passivation layer, and a second passivation layer disposed on the foreign material preventing layer is disposed.
According to claim 1,
and the first protective layer and the second protective layer are formed of an inorganic layer.
According to claim 1,
The foreign material preventing layer is composed of a thermosetting or photo-curing material, the display device.
According to claim 1,
The foreign material prevention layer is integrated with the λ/4 retardation layer of the circular polarizing plate, the display device.
6. The method of claim 5,
The λ/4 retardation layer is a display device obtained by curing a liquid material capable of a lamination or coating process.
According to claim 1,
The barrier layer may be formed of an inorganic insulating material such as aluminum oxide (AlOx), silicon oxynitride (SiON), silicon nitride (SiNx), or silicon oxide (SiO2), or an organic material such as benzocyclobutene or photo acryl. A display device formed as a single layer of an insulating material or in a structure in which an inorganic insulating material and an organic insulating material are stacked.
According to claim 1,
The passivation layer further comprises at least one protective layer,
The passivation layer of the passivation layer is composed of at least three passivation layers.
According to claim 1,
The polarizer is a linear polarizer.
According to claim 1,
The touch electrode is
a first insulating film;
and a plurality of X electrodes and Y electrodes crossing the first insulating layer therebetween.
11. The method of claim 10,
and a second insulating layer covering the X electrode and the Y electrode.
11. The method of claim 10,
A display device, wherein a driving voltage is applied to the X electrode and the Y electrode is driven in a mutual capacitance method by sensing a voltage drop that is changed depending on whether a touch is made.
According to claim 1,
and a thin film transistor disposed under the light emitting element and configured to be connected to the light emitting element.
14. The method of claim 13,
The display device of claim 1, further comprising a passivation layer and a planarization layer disposed on the thin film transistor.
15. The method of claim 14,
The light emitting device is
a first electrode disposed on the planarization layer;
a light emitting layer disposed on the first electrode; and
and a second electrode disposed on the light emitting layer.
16. The method of claim 15,
The first electrode is made of any one of a metal oxide such as ITO or IZO, a mixture of a metal and oxide such as ZnO:Al or SnO2:Sb, carbon nanotubes, graphene, and silver nanowires.
16. The method of claim 15,
The display device of claim 1 , further comprising a reflective electrode on or below the first electrode.
18. The method of claim 17,
The reflective electrode is A display device comprising aluminum, silver, and alloys thereof.
16. The method of claim 15,
The second electrode is made of a transparent conductive material including ITO or IZO.
According to claim 1,
The display device is a top emission type display device.
According to claim 1,
The display device of claim 1 , further comprising a capping layer disposed on the light emitting element.
16. The method of claim 15,
An organic material layer including the emission layer is disposed between the first electrode and the second electrode.
23. The method of claim 22,
The organic material layer is composed of a plurality of multi-layers, the display device.
24. The method of claim 23,
The organic material layer 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.
16. The method of claim 15,
The light emitting layer includes a light emitting layer that emits at least one of blue, red, and green.
According to claim 1,
The display device may be bent or folded.
According to claim 1,
The passivation layer is configured to include a retardation layer, and the polarizing plate is disposed as a linear polarizing plate, so that compared to an organic light emitting diode display including a circular polarizing plate, a thickness is reduced and bending of a low curvature is possible.

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