KR102296725B1 - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device, which includes a lower substrate including a plurality of sub-pixels and having a display area and a non-display area surrounding the display area, a thin film transistor formed on the lower substrate, and an organic film formed on the thin film transistor A light emitting device, an upper substrate disposed to face the lower substrate, a filling part filling a space between the upper substrate and the organic light emitting device, and a dam structure in contact with the upper and lower substrates in the non-display area and surrounding the filling part in the non-display area Including, the dam structure includes a base resin, hydrotalcite, and a porous nano material.

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 diode display, and more particularly, to an organic light emitting diode display that improves transparency and minimizes penetration of moisture and oxygen.

Recently, as we enter the information age, the field of display that visually expresses electrical information signals has developed rapidly, and in response to this, various display devices with excellent performance such as thinness, weight reduction, and low power consumption have been developed. is being developed

Specific examples of such a display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), an organic light emitting display device ( Organic Light Emitting Display Device (OLED), etc. are mentioned.

In particular, as a self-luminous device, an organic light emitting diode display is receiving widespread attention because it has advantages of a fast response speed, luminous efficiency, luminance, and viewing angle compared to other display devices. In addition, an organic light emitting diode (OLED) applied to an organic light emitting display device is a next-generation light source having self-luminance characteristics, and has a viewing angle, contrast, and response compared to a liquid crystal. It has excellent advantages in terms of speed and power consumption.

Recently, there has been an attempt to manufacture an organic light emitting diode display as a transparent display device. A transparent organic light emitting diode display is a display device for observing an object located at a rear side, and includes a pixel area through which an organic light emitting device emits light to display an image, and a transparent area through which external light is transmitted.

On the other hand, since the organic light emitting diode existing inside the organic light emitting diode display is made of organic material, it is vulnerable to moisture and oxygen, and thus, there is a problem in that the lifespan and reliability are reduced. Accordingly, in order to minimize penetration of moisture and oxygen into the organic light emitting device from the outside, various techniques for sealing the organic light emitting device are used. In particular, when a lower substrate used as a TFT array substrate and an upper substrate used as a color filter substrate are bonded to each other, a dam structure, in other words, a sealant is formed in a non-display area of the organic light emitting diode display. It includes a getter that blocks or adsorbs moisture to prevent penetration of moisture and oxygen from the side.

However, the conventionally used dam structure or sealant including a getter cannot secure transparency due to the low light transmittance of the getter, and thus it is difficult to apply to a transparent organic light emitting display device.

[Related technical literature]

1. Organic light emitting display device (Patent Application No. 10-2009-0133392)

2. Organic light emitting display device (Patent Application No. 10-2009-0031240)

Accordingly, an object of the present invention is to improve the moisture blocking performance of a dam structure disposed in a non-display area of an organic light emitting diode display.

Another object of the present invention is to provide an organic light emitting display device capable of securing transparency while minimizing oxygen and moisture penetrating from the side by improving light transmittance of a dam structure.

The problems 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.

In order to solve the above problems, an organic light emitting diode display according to an exemplary embodiment of the present invention includes a lower substrate including a plurality of sub-pixels, a display area and a non-display area surrounding the display area, on the lower substrate The thin film transistor formed in the thin film transistor, the organic light emitting element formed on the thin film transistor, the upper substrate disposed to face the lower substrate, a filling part filling a space between the upper substrate and the organic light emitting element, and the upper substrate and the lower substrate in the non-display area and a dam structure surrounding the filling part, wherein the dam structure includes a base resin, hydrotalcite, and a porous nanomaterial.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, by forming a dam structure including hydrotalcite and a porous nanomaterial in the non-display area of the organic light emitting diode display, oxygen and moisture blocking performance from the side is improved.

In addition, by improving the light transmittance of the dam structure, the present invention has the effect of securing transparency while minimizing oxygen and moisture penetrating from the side.

Also, the present invention may provide a transparent organic light emitting diode display.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1A is a schematic plan view illustrating an organic light emitting diode display according to an exemplary embodiment.
FIG. 1B is a schematic cross-sectional view taken along line I-I' of FIG. 1A.
2 is a schematic cross-sectional view illustrating a configuration of a dam structure of an organic light emitting diode display according to an exemplary embodiment.
FIG. 3 is a graph showing light transmittance according to changes in the contents of olefin resin and hydrotalcite in the dam-forming composition according to Example 1. FIG.
4 is a graph showing the light transmittance according to the content change of the olefin resin and MOF in the dam-forming composition according to Example 1.

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 implemented in a variety of 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 belongs It is provided to fully inform the possessor of 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 exemplary, and thus 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 subject matter 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 interpreted 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 the two parts unless 'directly' is used.

Reference to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of another device.

Although first, second, etc. are used to describe various elements, these elements 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.

Like reference numerals refer to like elements throughout.

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated component.

In the present specification, a transparent display device refers to a display device in which at least a portion of a screen of the display device recognized by a viewer is transparent. In the present specification, the transparency of the transparent display device means a transparent display device that is at least a level at which a user can recognize an object behind the display device. In the present specification, a transparent display device means, for example, a display device having a transmittance of at least 20% or more.

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, and technically various interlocking and driving are possible, as will be fully understood by those skilled in the art, and each embodiment may be independently implemented with respect to each other, It may be possible to implement together in a related relationship.

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

1A is a schematic plan view illustrating an organic light emitting diode display according to an exemplary embodiment. 1B is a schematic cross-sectional view taken along line I-I' of FIG. 1A. 1A and 1B illustrate a transparent organic light emitting diode display. Hereinafter, a transparent organic light emitting diode display will be described, but the present invention is not limited thereto. That is, if necessary, it may be applied to an opaque organic light emitting display device.

1A and 1B , the organic light emitting diode display 100 includes a lower substrate 110 , a thin film transistor 120 , a white organic light emitting device 140 , an encapsulation layer 150 , a filling part 160 , It includes an upper substrate 170 and a dam structure 180 .

The lower substrate 110 supports various components of the organic light emitting diode display 100 . Referring to FIG. 1A , the lower substrate 110 has an active area (A/A) and an inactive area (I/A). The display area A/A is an area in which the white organic light emitting diode 140 is disposed and is an area where an actual image is displayed, and the non-display area I/A is an outer area surrounding the display area A/A. , is an area where no image is displayed, and is an area in which various driving devices for driving the white organic light emitting device 140 are disposed.

The display area A/A and the non-display area I/A may have a shape suitable for designing an electronic device including the organic light emitting diode display 100 . For example, the display area A/A may have various shapes such as a pentagonal, hexagonal, circular, or oval shape, and the non-display area I/A may have an arbitrary shape surrounding the corresponding display area A/A. can have

Referring to FIG. 1A , a plurality of sub-pixels SP may be defined on a substrate 110 . Each of the plurality of sub-pixels SP is an area for displaying one color, and includes areas in which the white organic light emitting diode 140 is disposed in the display area A/A. The plurality of sub-pixels SP may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, or may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. The plurality of sub-pixels SP may be defined in a matrix form as shown in FIG. 1A .

Each of the plurality of sub-pixels SP of the organic light emitting diode display 100 includes an emissive area EA and a transmissive area TA. The light emitting area EA may be referred to as a non-transmissive area or a light emitting area, and the transmissive area TA may be referred to as a transmissive area. The light emitting area EA is an area in which an actual image is realized, and is an area through which external light is not transmitted, and the transmission area TA refers to an area through which external light is transmitted. Accordingly, when the organic light emitting diode display 100 is not driven, the user can visually recognize the background, that is, the object behind the display through the transparent area TA. Alternatively, when the organic light emitting diode display 100 is driven, the user can simultaneously view the image of the emission area EA and the background through the transmission area TA. In the sub-pixel SP, the area ratio of the emission area EA and the transmission area TA may be variously set in terms of visibility and transmittance.

Meanwhile, as described above, although the transparent organic light emitting display device is described with reference to FIGS. 1A and 1B , the present invention is not limited thereto, and may be applied to an opaque organic light emitting display device. In the case of an opaque organic light emitting diode display, the transmissive area may not exist or may occupy a very small area.

The lower substrate 110 may be made of an insulating material. The lower substrate 110 may be made of a flexible material, and when the organic light emitting diode display 100 is a transparent organic light emitting display device, the lower substrate 100 may be formed of a transparent material. For example, the flexible transparent material includes polyimide (PI), polyetherimide (PEI), polyethylene terephthalate (PET), polycarbonate (PC), and polymethyl methacrylate. (polymethylmethacrylate; PMMA), polystyrene (PS), styreneacrylnitrile copolymer (SAN), silicone-acryl resin, and the like.

A buffer layer 131 on the lower substrate 110 to protect various components of the organic light emitting diode display 100 from penetration _{of moisture (H 2} O) and hydrogen (H ₂ ) from outside the lower substrate 110 . this is formed However, the buffer layer 131 may be omitted depending on the structure or characteristics of the organic light emitting diode display 100 .

A thin film transistor 120 including a gate electrode 121 , an active layer 122 , a source electrode 123 , and a drain electrode 124 is formed on the buffer layer 131 . For example, an active layer 122 is formed on the substrate 110 , and a gate insulating layer 132 for insulating the active layer 122 and the gate electrode 121 is formed on the active layer 122 . . An interlayer insulating layer 133 for insulating the gate electrode 121, the source electrode 123, and the drain electrode 124 is formed, and a source electrode (or contacting the active layer 122) is formed on the interlayer insulating layer 133, respectively. 123) and a drain electrode 124 are formed. 1B illustrates only a driving thin film transistor among various thin film transistors that may be included in the organic light emitting diode display 100 for convenience of explanation, but a switching thin film transistor and a capacitor may also be included in the organic light emitting display apparatus 100 . In addition, although the thin film transistor 120 has been described as having a coplanar structure in this specification, a thin film transistor having a staggered structure may also be used.

A planarization layer 134 is formed on the thin film transistor 120 . The planarization layer 134 planarizes an upper portion of the thin film transistor 120 . The planarization layer 134 may be formed of a single layer or a plurality of layers, and may be formed of an organic material. For example, the planarization layer 134 may be made of an acryl-based organic material, but is not limited thereto. The planarization layer 134 includes a contact hole for electrically connecting the thin film transistor 120 and the anode 141 .

In some embodiments, a passivation layer may be formed between the thin film transistor 120 and the planarization layer 134 . The passivation layer may be made of an inorganic material, and may be formed of a single layer or a multilayer, but is not limited thereto.

The white organic light emitting device 140 is electrically connected to the thin film transistor 120 , and includes an anode 141 , a white organic light emitting layer 142 , and a cathode 143 . The white organic light emitting device 140 is driven on the principle that a hole supplied from the anode 141 and an electron supplied from the cathode 143 are combined in the white organic light emitting layer 142 to emit light, form an image.

The anode 141 is disposed on the planarization layer 134 . The anode 141 is an electrode configured to supply holes to the white organic light emitting layer 142 . The anode 141 may be made of a transparent conductive material having a high work function. Here, the transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). When the organic light emitting diode display 100 is a top emission type, the anode 141 may further include a reflector.

The anode 141 is electrically connected to the thin film transistor 120 through a contact hole of the planarization layer 134 . For example, although it is illustrated in FIG. 1B that the anode 141 is electrically connected to the source electrode 123 of the thin film transistor 120 , it may be electrically connected to the drain electrode 124 . The anode 141 is spaced apart for each sub-pixel SP. In addition, the anode 141 is formed in the light emitting area EA in each sub-pixel SP. Even when the anode 141 is made of a transparent conductive material, when the anode 141 overlaps the transmission area TA, the transmittance of the transmission area TA is reduced. In addition, when the anode 141 additionally includes a reflective plate, the transmittance of the transmission area TA is remarkably reduced. Accordingly, although not limited thereto, the anode 141 may be formed only in the emission area EA and not in the transmission area TA.

The cathode 143 is disposed on the anode 141 . The cathode 143 supplies electrons to the white organic emission layer 142 . The cathode 143 includes indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (Zinc Oxide, ZnO), and tin. It may be made of a transparent conductive oxide (Tin Oxide, TO)-based oxide or a ytterbium (Yb) alloy. Alternatively, the cathode 143 may be made of a very thin metal material.

A white organic light emitting layer 142 is disposed between the anode 141 and the cathode 143 . The white organic light emitting layer 142 is configured to emit white light. The white organic light emitting layer 142 may be configured as a single light emitting layer to emit white light. Alternatively, the white organic light emitting layer 142 may emit white light from a light emitting unit having a stack structure in which a plurality of light emitting layers emitting light of different colors are stacked with a charge generating layer therebetween. For example, the color of the light emitted from the first light emitting layer has a complementary color relationship with that of the light emitted from the second light emitting layer. can In addition to the white organic light emitting layer 142 , the white organic light emitting device 140 may include at least one organic layer among a hole transport layer, an electron transport layer, a hole blocking layer, an electron blocking layer, a hole injection layer, and an electron injection layer. Since this organic layer can transfer or inject electrons or holes into the white organic light emitting layer 142 , the light emitting efficiency of the white organic light emitting layer 142 can be improved.

In this case, the white organic emission layer 142 may be a common layer formed in the plurality of sub-pixels SP. That is, as shown in FIG. 1B , the white organic emission layer 142 may be formed as a single layer on the planarization layer 134 and the anode 141 . Accordingly, the white organic emission layer 142 may be continuously formed in the plurality of sub-pixels SP of the organic light emitting diode display 100 .

The white organic emission layer 142 having a structure of a common layer formed in the plurality of sub-pixels SP may be formed using an open mask. When the white organic light-emitting layer 142 is formed using an open mask, problems such as color mixing due to overlapping and misalignment of the FMM that occur when the organic light-emitting layer is pattern-deposited using the FMM can be solved.

A bank layer 135 is formed on the planarization layer 134 including the anode 141 . The bank layer 135 serves to distinguish adjacent sub-pixels SP, and additionally serves to separate the emission area EA from the transmission area TA in one sub-pixel SP. Accordingly, the bank layer 135 is disposed between the adjacent sub-pixels SP and between the emission area EA and the transmission area TA in one sub-pixel SP. Also, the bank layer 135 may be formed to open a portion of the anode 141 . The bank layer 135 may be formed of any one of an organic insulating material, for example, polyimide, photo acryl, or benzocyclobutene (BCB). The bank layer 135 may be formed in a tapered shape.

Meanwhile, in FIG. 1B , the white organic light emitting layer 142 and the cathode 143 constituting the white organic light emitting device 140 are formed over the entire surface of the bank layer 135 and the planarization layer 134 . Although not shown in the drawings, the white organic emission layer and the cathode may be separated and formed only in the emission area EA of each sub-pixel SP.

An encapsulation layer 150 is disposed on the white organic light emitting device 140 . The encapsulation layer 150 may be made of an inorganic material. Although the encapsulation layer is illustrated as a single layer in FIG. 1B , the encapsulation layer 150 may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer.

Specifically, the first inorganic encapsulation layer is disposed to cover the white organic light emitting diode 140 . The first inorganic encapsulation layer protects the white organic light emitting device 140 from moisture, air, or physical impact that may penetrate from the outside. The first inorganic encapsulation layer may be formed to conformally cover the upper surface of the white organic light emitting device 140 . The first inorganic encapsulation layer may be formed of an inorganic material. For example, the first inorganic encapsulation layer may be formed of various inorganic materials such as silicon nitride (SiNx), silicon oxide (SiOx), and silicon oxynitride (SiON).

The organic encapsulation layer is disposed on the first inorganic encapsulation layer. The organic encapsulation layer may compensate for a step difference existing under the organic encapsulation layer. For example, a step may be generated in the display area by the white organic light emitting diode 140 and the thin film transistor 120 . Referring to FIG. 1B , each layer disposed on the anode 141 has a step difference due to the anode 141 formed separately according to the sub-pixel SP. Accordingly, the organic encapsulation layer may compensate for such a step difference and may have a flat top surface. In addition, the organic encapsulation layer may compensate for a step difference due to a foreign material that may exist under the organic encapsulation layer. For example, a step may occur due to a foreign material generated during manufacturing of a component under the organic encapsulation layer or a foreign material introduced from the outside. Accordingly, the organic encapsulation layer may have a flat top surface while compensating for a step caused by a foreign material.

The organic encapsulation layer is made of polystyrene resin, acrylic resin, epoxy resin, urea resin, isocyanate resin, xylene resin, silicone oxycarbon. (SiOC) may be made of any one material or a mixture thereof, but is not limited thereto.

The second inorganic encapsulation layer is disposed on the organic encapsulation layer. The second inorganic encapsulation layer covers the organic encapsulation layer. The second inorganic encapsulation layer may be a protective layer that protects the white organic light emitting diode 140 from moisture, air, or physical impact. The second inorganic encapsulation layer may be formed to conformally cover the first inorganic encapsulation layer and the organic encapsulation layer. The second inorganic encapsulation layer may be formed of an inorganic material. For example, the second inorganic encapsulation layer may be formed of various inorganic materials such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), but is not limited thereto.

The filling part 160 is disposed on the encapsulation layer 150 . The filling part 160 occupies a space between the encapsulation layer 150 and the upper substrate 170 .

The filling part 160 may be an adhesive layer that bonds the encapsulation layer 150 and the upper substrate 170 to each other. In this case, the filling part 160 may be a thermal curing type, light curing type, or natural curing type adhesive. For example, the adhesive layer 145 may be made of a material such as a barrier pressure sensitive adhesive (B-PSA).

Also, the filling part 160 may be a moisture barrier layer for minimizing penetration of moisture and oxygen into the organic light emitting diode display. When the lower substrate 110 and the upper substrate 170 are bonded together, when a separate material is not filled in the space between the lower substrate 110 and the upper substrate 170 , the outside of the organic light emitting diode display 100 . may be relatively vulnerable to moisture and oxygen penetrating from Accordingly, by filling the space between the lower substrate 110 and the upper substrate 170 with a moisture barrier layer that suppresses penetration of moisture and oxygen, it is possible to effectively block moisture and oxygen from penetrating from the outside of the organic light emitting diode display 100 . . In this case, the filling part 160 may be made of a desiccant that absorbs moisture or prevents the progress of moisture and oxygen.

The upper substrate 170 is disposed on the filling part 160 . The upper substrate 170 is disposed to face the lower substrate 110 . The upper substrate 170 supports various components of the organic light emitting diode display 100 . Specifically, the upper substrate 170 is a base substrate constituting a color filter substrate. On the upper substrate 170 , a color filter layer 171 and a black matrix 172 for the organic light emitting diode display 100 to implement color are formed.

The black matrix 172 is formed on the lower surface of the upper substrate 170 and is formed at the boundary between each sub-pixel SP and at the boundary between the light emitting area EA and the transmissive area TA in the sub-pixel SP. is formed The black matrix 172 may partition the emission region of the light passing through the color filter layer 171 so that the light passing through each color filter does not overlap or mix with each other. The black matrix 172 may be formed of chromium (Cr) or other opaque metal film, or may be formed of a mixture of a pigment and a resin.

The color filter layer 171 is formed on the lower surface of the upper substrate 170 . The color filter layer 171 may be formed for each sub-pixel SP on the upper substrate 170 , and a red (R) color filter, a green (G) color filter, and a blue color filter are patterned for each sub-pixel SP. (B) may include a color filter. According to an embodiment of the present invention, since white light is emitted from the white organic light emitting diode 140 , a color filter layer 171 patterned for each sub-pixel SP is additionally provided to express a color image.

The dam structure 180 is formed between the lower substrate 110 and the upper substrate 170 in the non-display area I/A. The dam structure 180 is disposed to surround the filling part 160 and is disposed to contact the lower substrate 110 and the upper substrate 170 . The dam structure 180 may reinforce the adhesive force of the filling part 160 by bonding the lower substrate 110 and the upper substrate 170 , and moisture and oxygen penetrating from the side surface of the organic light emitting display device 100 . serves to block Since the dam structure 180 functions as a member sealing the components between the lower substrate 110 and the upper substrate 170 , it may also be referred to as a sealant.

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

Referring to FIG. 2 , the dam structure 180 includes a base resin 281 , a hydrotalcite 282 , and a porous nanomaterial 283 .

The base resin 281 is a resin composition formed from a binder compound, and the hydrotalcite 282 and the porous nanomaterial 283 that are components of the dam structure 180 are dispersed. The base resin 281 may function to block moisture by itself. On the other hand, the base resin 281 preferably has high transparency and low birefringence.

The base resin 281 may be formed by polymerization of a binder compound. An epoxy resin or an olefin resin may be used as the binder compound, and specific details will be described in more detail in the dam forming composition.

The hydrotalcite 282 is a complex compound of a metal material and an organic/inorganic material, which has a high adsorption performance for water and a function of delaying water penetration. Specific details regarding the hydrotalcite 282 are described in more detail in the dam forming composition.

The porous nano-material 283 serves as a getter to block moisture and is a material having nano-sized pores. Specific details regarding the porous nanomaterial 283 will be described in more detail in the dam-forming composition.

Hereinafter, a dam-forming composition for forming the dam structure 180 will be described.

The dam-forming composition includes a binder compound, hydrotalcite, and a porous nanomaterial. In addition, the dam-forming composition may further include a spacer, an adhesion enhancer, an initiator and a solvent.

binder compound

An epoxy resin or an olefin resin may be used as a binder compound serving as a binder in the dam-forming composition.

First, as an epoxy resin, various epoxy resins can be used. For example, as for an epoxy resin, a bisphenol A epoxy resin, a phenol novolak-type epoxy resin, a cresol novolak-type epoxy resin, a biphenyl-type epoxy resin, and a triphenylmethane-type epoxy resin are mentioned. These epoxy resins may be used alone or in combination of two or more, but is not limited thereto. Among them, it is preferable from the viewpoint of reliability and moldability to use a biphenyl type epoxy resin or a low hygroscopicity type epoxy resin obtained by adding a lower alkyl group to a phenyl ring. As such an epoxy resin, it is preferable that the epoxy equivalent is 150-250 and the softening point or melting|fusing point is 50-130 degreeC.

On the other hand, the olefin resin is high density polyethylene (HDPE, high density polyethylene), low density polyethylene (LDPE, low density polyethylene), linear low density polyethylene (LLDPE, liner low density polyethylene), ethylene-propylene copolymer, metallocene polyethylene, and poly It may be at least one selected from the group consisting of propylene. At this time, the polypropylene resin is a homopolymer of propylene, a copolymer, a metallocene polypropylene, a homopolymer or copolymer of propylene, etc. by adding talc, a flame retardant, etc. to the group consisting of a composite resin in which the physical properties of general polypropylene are strengthened. It may be at least one selected from

The olefin resin has a high transparency property compared to the epoxy resin, and thus has an advantage in being applied to a transparent organic light emitting display device.

The content of the binder compound is preferably 45 wt% to 85 wt%, based on the solid content of the total composition. When the content of the binder compound satisfies the above range, sufficient degree of hardening and viscosity sufficient to form a dam structure may be satisfied.

hydrotalcite ( hydrotalcite )

Hydrotalcite is a complex hydroxide salt having a layered structure composed of a metal material and an organic/inorganic material. Hydrotalcite has a high adsorption performance for moisture and functions to delay moisture penetration. In addition, it has high adsorption performance for chlorine ions, which deteriorates reliability under high-temperature and high-humidity conditions.

Hydrotalcite may be represented by the following formula (1).

[Formula 1]

Q _x L _y (OH) _2x+3y-2z (A) _z aH ₂ O

In Formula 1, L is a divalent ionic metal, Q is a trivalent ionic metal, A is an anionic material, x satisfies 3<x<8, y satisfies 1<y<3, and z is a real number that satisfies 0<z<4.

In the above-mentioned formula (1), L is a divalent ionic metal, for example, magnesium (Mg), iron (Fe), zinc (Zn), calcium (Ca), nickel (Ni), cobalt (Co) and copper (Cu). Q is a divalent ionic metal, and may be, for example, aluminum (Al), iron (Fe), or manganese (Mn). A is an n-valent anionic material, and specific examples thereof may be OH ^- , SO ₄ ^2- , CO ₃ ^2- and NO ₃ ^- .

More specifically, hydrotalcite is a hydroxide containing magnesium (Mg) and aluminum (Al) as essential components, and may be represented by the following formula (2).

[Formula 2]

Mg _x Al _y (OH) _2x+3y-2z (CO ₃ ) _z aH ₂ O

In Formula 2, x is a real number that satisfies 3<x<8, y satisfies 1<y<3, and z satisfies 0<z<4.

Specific examples of the hydrotalcite represented by Formula 2 include Mg _{4 . 5} Al ₂ (OH) ₁₃ CO ₃ 3.5H ₂ O, Mg _4.3 Al ₂ (OH) _12.6 CO ₃ 4H ₂ O, Mg ₅ Al _{1 . 5} (OH) ₁₃ CO ₃ 3.5H ₂ O, Mg ₆ Al ₂ (OH) ₁₆ CO ₃ 4H ₂ O, Mg _4.2 Al ₂ (OH) _12.4 CO ₃ 3.5H ₂ O, and the like.

The size of the hydrotalcite is preferably 1 nm to 100 nm.

In addition, the refractive index of hydrotalcite is preferably about 1.5.

In addition, the content of hydrotalcite may be 10 wt% to 40 wt%, preferably 25 wt% to 35 wt%, based on the solid content of the total composition. When the content of hydrotalcite satisfies the above range, moisture adsorption performance and moisture penetration delay ability can be realized, and a viscosity suitable for forming into a dam structure can be maintained.

Porous nanomaterials

The porous nanomaterial acts as a getter to block moisture. The porous nanomaterial may have an average pore size of 1 nm to 50 nm, more preferably having an average pore size of 1 nm to 10 nm, but is not limited thereto.

The porous nanomaterial may be an inorganic material, an organic material, or an organic-inorganic composite material. Specifically, the porous nanomaterial is aluminum (Al), titanium (Ti), zinc (Zn), magnesium (Mg), tin (Sn), silicon (Si), indium (In), gallium (Ga), oxygen (O ), and may be an inorganic material or an organic material based on one or more materials selected from the group consisting of carbon (C), or aluminum (Al), titanium (Ti), zinc (Zn), magnesium (Mg), It is based on one or more materials selected from the group consisting of tin (Sn), silicon (Si), indium (In), gallium (Ga), oxygen (O), and carbon (C), a part of which is another metal or It may be an inorganic material modified with an organic material, an organic material, or an organic-inorganic composite material.

Among these porous nanomaterials, a zeolite material or a metal-organic framework (MOF) may be preferably used.

The zeolite material is a material having micropores having a pore size of 5 nm or less, and more specifically, may be a natural zeolite or a modified zeolite. Here, the natural zeolite is _{a material represented by (Si, Al)O 4} , and is an inorganic material based on silicon (Si) and aluminum (Al). means a surface-modified zeolite. Examples of ion exchange include ion exchange with Li or Ca. As the zeolite materials, as long as they have the ability to block and capture moisture and oxygen as an effect according to the present invention, they are not limited and can be used in various ways.

MOF is a porous crystalline compound, and may be a porous crystalline compound in which metal ions or metal ion clusters are formed by chemical bonding with organic ligands. The size of the pores of the MOF may be 1 nm to 10 nm, preferably, 1 nm to 8 nm.

The metal ion forming the MOF is a metal ion capable of coordinating or covalent bonding. For example, metal ions that form the MOF is ^{Ti 3 +, Ti4 +, Fe2} +, Fe 3 +, V4 +, V 3+, V 2+, Y 3+, Zr 4 +, Cu 2 +, Al 3 ^+, it may be a ^{2 +} Si, Si ^{+ 4,} Cr ^{+ 3,} Ga ^{+ 3,} Mg ^{+ 2,} Zn ^{+ 2,} Zn ^{+ 3,} Mn ^{+ 2,} Mn ^{+ 3,} Mn ^{+ 4,} and combinations thereof.

The organic ligand forming the MOF may be an organic material having a group capable of coordinating, ionic or covalent bonding, and has two or more sites capable of coordination, ionic bonding or covalent bonding to form a stable metal-organic framework structure. Organic substances such as bidentate, tridentate and the like are advantageous.

For example, the organic ligand forming the MOF is an aromatic dicarboxylic acid, an aromatic tricarboxylic acid, an imidazole-based compound, a tetrazole-based compound, a triazole-based compound, a pyrazole-based compound, an aromatic sulfonic acid, an aromatic phosphoric acid, an aromatic sulfinic acid ( sulfinic acid), aromatic phosphinic acid, bipyridine-based compounds, and combinations thereof. More specifically, the organic ligand is 1,4-benzenedicarboxylate (BDC), 1,3,5-benzenetricarboxylate (1,3,5-benzenetricarboxlate: BTC), 1 ,1'-biphenyl-3,3',5,5'-tetracarboxylate (1,1'-biphenyl-3,3',5,5'-tetracarboxylate: BPTC) and 2-(N,N ,N',N'-tetrakis(4-carboxyphenyl)-biphenyl-4,4'-diamine (2-(N,N,N',N'-tetrakis(4-carboxyphenyl)-biphenyl-4, 4'-diamine: TCBTDA) may be at least one selected from the group consisting of.

On the other hand, MOF may be a solvate. The solvate means that the solvent molecules are contained in the MOF due to the interaction between the molecules constituting the MOF and the solvent molecules. These solvent molecules may be coordinated with the MOF or may be physically adsorbed.

Solvents that form MOF solvates include, for example, ethanol, ethanol, propanol, isopropanol, butanol, N,N-dimethylformamide (DMF), N,N-diethylformamide (DEF), acetonitrile. , chloroform, normal hexane (n-Hexane), benzene, toluene, xylene, diethyl ether, may be at least one solvent selected from the group consisting of acetone and water, but is not limited thereto.

For example, Al ₁₃ (OH) ₂₇ (H ₂ O) ₆ (BDC-NH ₂ ) ₃ Cl ₆ (C ₃ H ₇ OH) ₆ may be used as the MOF solvate.

In addition, the content of the porous nanomaterial may be 1 wt% to 20 wt%, preferably 1 wt% to 10 wt%, based on the solid content of the total composition. When the content of the porous nanomaterial satisfies the above range, it is possible to realize excellent moisture barrier performance and maintain transparency at the same time. When the content of the porous nanomaterial is less than 1% by weight, the moisture barrier performance is lowered, and when it is more than 20% by weight, aggregation between the porous nanomaterials including the metal occurs, resulting in performance degradation.

spacer

The spacer maintains the height of the dam structure, maintains a gap between the upper substrate and the lower substrate, and blocks the moisture permeation path.

As the spacer, a material satisfying sufficient hardness and light transmittance may be used, for example, glass fiber or silica may be used, but is not limited thereto.

The maximum diameter of the spacer may be 2um to 10um. When the maximum diameter of the spacer satisfies the above range, the water penetration performance of the dam structure may be improved, the dam structure may be protected from external impact, and the gap between the upper substrate and the lower substrate may be maintained.

The content of the spacer is preferably 0.1 wt% to 0.5 wt%, based on the solid content of the total composition.

silane coupling agent

A silane coupling agent may additionally be used to improve the adhesion of the dam-forming composition. As a silane coupling agent, those known to those skilled in the art to which the present invention pertains may be used.

The content of the silane coupling agent is preferably 1 wt% to 5 wt%, based on the solid content of the total composition. When the content of the silane coupling agent satisfies the above range, the dam-forming composition may serve as an adhesive for bonding the upper substrate and the lower substrate.

initiator

As the initiator, a photopolymerization initiator and a thermal curing initiator may be used depending on the curing method of the dam-forming composition.

For example, the thermal curing initiator may include an amine-based curing agent, an acid anhydride-based curing agent, an imidazole-based curing agent, and the like, and may be appropriately selected depending on the process temperature.

On the other hand, the photoinitiator is, for example, a benzoin-based compound, an acetophenone-based compound, a diethoxyacetophenone-based compound, a hydroxyacetophenone-based compound, a benzophenone-based compound, a thioxanthone-based compound, an anthraquinone-based compound, α -Acyloxime ester-based compound, phenylglyoxylate-based compound, benzyl-based compound, azo-based compound, diphenylsulfide-based compound, acylphosphineoxyl-based compound, organic dye-based compound, iron-phthalocyanine-based compound, etc. may be used. However, it is not limited thereto.

The content of the initiator is preferably 1 wt% to 5 wt%, based on the solid content of the total composition. When the content of the initiator satisfies the above range, hardening may be sufficiently performed when the dam structure is formed, and flexibility of the dam structure may be secured.

menstruum

A solvent may additionally be used to control the viscosity of the dam forming composition. For example, solvents include N-methyl-2-pyrrolidone, gamma butyl lactone, butyl cellosolve, and propylene glycol monomethyl ether acetate. ether acetate), isopropyl acetate, butyl acetate, ethanol, ethyl lactate, etc. may be used, but is not limited thereto.

The dam structure 180 may be formed by curing the above-described dam-forming composition. For example, the prepared dam-forming composition is applied on the lower substrate 110 , and then the upper substrate 170 is disposed on the lower substrate 110 to adhere to the applied dam-forming composition. Thereafter, the dam-forming composition is cured by irradiating light or applying heat to the area to which the dam-forming composition is applied.

The dam structure 180 formed from the dam-forming composition has a content ratio of constituent compounds similar to that of the dam-forming composition. That is, the content ratio of the compounds included in the dam structure 180 is similar to the content ratio of the compounds included in the dam forming composition. In order to form a dam structure according to an embodiment of the present invention, the dam-forming composition may not contain a solvent or may contain only a very small amount. This is because in order to form a dam structure having sufficient height and strength, the concentration and viscosity of the dam-forming composition must be high, and outgassing must be prevented from occurring during the curing process. Therefore, the content ratio of the base resin, hydrotalcite, and porous nanomaterial of the dam structure 180 is that of the binder compound, hydrotalcite, and porous nanomaterial included in the dam forming composition used to manufacture the dam structure 180 . It may be substantially the same as the content ratio.

On the other hand, the dam structure 180 formed from the above-described dam-forming composition has excellent water penetration performance and exhibits excellent light transmittance. Specifically, the light transmittance of the dam structure is 90% or more, which is significantly higher than that of the conventional dam structures using a metal oxide as a getter.

The shape of the dam structure 180 may be freely changed according to the structure of the organic light emitting diode display 100 and the design of each component.

An organic light emitting diode display according to an exemplary embodiment includes a dam structure positioned in a non-display area, in contact with an upper substrate and a lower substrate, and surrounding a filling part. The dam structure includes a base resin, hydrotalcite, and a porous nanomaterial. The dam structure bonds the upper substrate and the lower substrate of the organic light emitting diode display, seals internal fillers or other components, and blocks moisture and oxygen penetrating from the side surface of the organic light emitting diode display.

Conventional dam structures include barium oxide (BaO), calcium oxide (CaO), magnesium oxide (MgO), lithium oxide (Li ₂ O), sodium oxide (Na ₂ O), potassium oxide (K ₂ O) for water absorption. , lithium sulfate (LiSO), and sodium sulfate (Na ₂ SO ₄ ). However, the getter made of the above-described metal oxide has a very large particle diameter and is not uniform in size, so optical properties are insufficient due to low light transmittance and high haze. Since the transparency of the dam structure is also reduced when an opaque getter is used, when a conventional getter is applied to a transparent organic light emitting display device, there is a problem in that the dam structure is visually recognized in a non-display area of the organic light emitting display device. However, since the organic light emitting diode display according to an embodiment of the present invention includes hydrotalcite and a porous nanomaterial at the same time, water penetration performance is improved and the transparency of the dam structure is greatly improved. Accordingly, transparency of the transparent organic light emitting display device may be improved, and the lifespan of the organic light emitting display device due to moisture and oxygen may be improved.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are for illustration of the present invention, and the scope of the present invention is not limited by the following examples.

Example and comparative example 1 to 4

A dam-forming composition was prepared with the content of the compound as shown in Table 1 below. At this time, the content is based on the solid content of the entire composition.

Experimental example One - light transmittance measurement

The composition prepared in Examples 1 and Comparative Examples 1 to 4 was applied on a glass substrate and cured to form a coating film having a thickness of 10 μm. Then, through an optical measuring device, the light transmittance when the 450 nm wavelength light was transmitted was measured. The resulting values are shown in Table 1 below.

Experimental example 2 - water penetration rate ( Water transfer velocity , WTV ) measurement

After depositing Ca on a glass substrate, the compositions prepared in Examples 1 and Comparative Examples 1 to 4 were applied and cured to form a coating film having a thickness of 10 μm. Thereafter, after 200 hours of storage at a temperature of 85°C and a humidity of 85%, the point at which Ca is oxidized is observed. By measuring the length of Ca modified by oxidation based on the original Ca, the water permeation rate was measured. The resulting values are shown in Table 1 below.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Olefin resin 55% by weight 55% by weight 80% by weight 65% by weight 60% by weight hydrotalcite 25% by weight - - 25% by weight - MOF 10% by weight - 10% by weight - - CaO - 10% by weight - - - spacer 0.3% by weight 0.3% by weight 0.3% by weight 0.3% by weight 0.3% by weight coupling agent 5% by weight 5% by weight 5% by weight 5% by weight 5% by weight initiator 4.7% by weight 4.7% by weight 4.7% by weight 4.7% by weight 4.7% by weight light transmittance 90% 40% 90% 90% 93 WTV 2.5mm/ 200hr 3.3mm/ 200hr 4.2mm/ 200hr 3.8mm/ 200hr 5.8mm/ 200hr

Hydrotalcite: Mg ₆ Al ₂ (OH) ₁₆ CO ₃ 4 (H ₂ O)

MOF: metal organic structure, Al ₁₃ (OH) ₂₇ (H ₂ O) ₆ (BDC-NH ₂ ) ₃ Cl ₆ (C ₃ H ₇ OH) ₆

CaO: Calcium Oxide

As can be seen from Table 1 above, the composition according to Example 1 includes an olefin resin, hydrotalcite and MOF. It was confirmed that the coating layer formed from the composition according to Example 1 not only had a high light transmittance of 90%, but also had excellent moisture penetration prevention performance. Comparative Example 1 is a conventional dam-forming composition containing calcium oxide (CaO) as a getter without hydrotalcite and MOF, and exhibits good moisture penetration prevention performance of about 3.3 mm/200hr, but has a light transmittance of 40 %am. That is, it was confirmed that Comparative Example 1, which is a conventional dam-forming composition, had significantly lower transparency than that of Example. On the other hand, Comparative Examples 2 and 3 are dam-forming compositions including only one each, unlike Example 1 including both hydrotalcite and MOF. Comparative Examples 2 and 3 had a light transmittance of about 90%, and thus had excellent transparency. However, it was confirmed that the moisture penetration prevention performance was significantly insufficient compared to Example 1.

Experimental example 3 - hydrotalcite and measuring the effect according to the content of porous nanomaterials

While changing the hydrotalcite and MOF content in the dam-forming composition according to Example 1, the change in light transmittance was measured accordingly.

3 is a graph showing the light transmittance according to the content change of the olefin resin and hydrotalcite in the dam-forming composition according to Example 1. Referring to FIG. 3 , when the content of hydrosite exceeds 35% by weight based on the solid content of the total composition, it was confirmed that the light transmittance rapidly decreased.

4 is a graph showing the light transmittance according to the content change of the olefin resin and MOF in the dam-forming composition according to Example 1. 4, it can be seen that the light transmittance gradually decreases as the content of MOF increases, and when the content of MOF exceeds 20% by weight based on the solid content of the entire composition, the light transmittance decreases to 90% or less could confirm that

An exemplary embodiment of the present invention can be described as follows.

In order to solve the above problems, an organic light emitting diode display according to an embodiment of the present invention includes a lower substrate including a plurality of sub-pixels and having a display area and a non-display area surrounding the display area, the lower substrate A thin film transistor formed on the thin film transistor, an organic light emitting device formed on the thin film transistor, an upper substrate disposed to face the lower substrate, a filling part filling a space between the upper substrate and the organic light emitting device, and the upper and lower substrates in the non-display area and a dam structure that contacts and surrounds the filling part in the non-display area, and the dam structure includes a base resin, hydrotalcite, and a porous nanomaterial.

The dam structure may suppress penetration of moisture and oxygen from the side surface of the organic light emitting diode display.

Hydrotalcite may be represented by the following formula (2).

[Formula 2]

Mg _x Al _y (OH) _2x+3y-2z (CO ₃ ) _z aH ₂ O

(In Formula 2, x is a real number that satisfies 3<x<8, y satisfies 1<y<3, and z is a real number that satisfies 0<z<4)

The porous nanomaterial may be an inorganic material having a pore size of 1 nm to 50 nm, an organic material, or an organic-inorganic composite material.

The porous nanomaterial may be a zeolite material or a metal organic framework (MOF).

Porous nanomaterials are metal organic structures formed by chemical bonding of metal ions and organic ligands, and metal ions are Ti ^{3 +} , Ti4 ⁺ , Fe2 ⁺ , Fe ^{3 +} , V4 ⁺ , V ³⁺ , V ²⁺ , Y ³⁺ , Zr ^{4 +,} Cu ^{2 +,} Al ^3+, Si ^{+ 2,} Si ^{+ 4,} Cr ^{+ 3,} Ga ^{+ 3,} Mg ^{+ 2,} Zn ^{+ 2,} Zn ^{+ 3,} Mn ^{+ 2,} Mn ^{+ 3} and Mn ^{at least one selected from the group consisting of 4 +} , and the organic ligand is an aromatic dicarboxylic acid, an aromatic tricarboxylic acid, an imidazole-based compound, a tetrazole-based compound, a triazole-based compound, a pyrazole-based compound, an aromatic sulfonic acid, an aromatic phosphoric acid, It may be at least one selected from the group consisting of aromatic sulfinic acid, aromatic phosphinic acid, and bipyridine-based compounds.

The porous nanomaterial is a metal organic structure solvate mixed with a metal organic structure and a solvent molecule, and the solvent molecules are ethanol, ethanol, propanol, isopropanol, butanol, N,N-dimethylformamide (DMF), N,N-di It may be at least one selected from the group consisting of ethylformamide (DEF), acetonitrile, chloroform, normal hexane (n-Hexane), benzene, toluene, xylene, diethyl ether, acetone, and water.

The metal ion constituting the metal organic structure may be an ^{aluminum ion (Al 3 + ).}

The base resin may be an olefin resin.

The dam structure may include hydrotalcite in an amount of 10 wt% to 40 wt%, and porous nanomaterial in an amount of 1 wt% to 20 wt%.

The light transmittance of the dam structure may be 90% or more.

Each of the plurality of sub-pixels may have an emission area and a transmission area.

The organic light emitting device may further include a color filter that emits white light and is formed in a partial region of the upper substrate.

An encapsulation layer disposed between the organic light emitting device and the filling part and covering the organic light emitting device may be further included.

Although the 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. . Therefore, 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 equivalent range should be construed as being included in the scope of the present invention.

100: organic light emitting display device
110: lower substrate
120: thin film transistor
121: gate electrode
122: active layer
123: source electrode
124: drain electrode
131: buffer layer
132: gate insulating layer
133: interlayer insulating layer
134: planarization layer
140: white organic light emitting device
141: anode
142: white organic light emitting layer
143: cathode
150: encapsulation layer
160: filling part
170: upper substrate
180, 280: dam structure
281: base resin
282: hydrotalcite
283: porous nanomaterial

Claims (14)

a lower substrate including a plurality of sub-pixels and having a display area and a non-display area surrounding the display area;
a thin film transistor formed on the lower substrate;
an organic light emitting device formed on the thin film transistor;
an upper substrate facing the lower substrate;
a filling part filling a space between the upper substrate and the organic light emitting device; and
and a dam structure in contact with the upper substrate and the lower substrate in the non-display area and surrounding the filling part;
The dam structure includes a base resin, hydrotalcite, and a porous nanomaterial,
The porous nanomaterial is a metal organic framework (MOF) formed by a coordination bond or a covalent bond between a metal ion and an organic ligand,
The metal ions are Ti ³⁺ , Ti4 ⁺ , Fe2 ⁺ , Fe ³⁺ , V4 ⁺ , V ³⁺ , V ²⁺ , Y ³⁺ , Zr ⁴⁺ , Cu ²⁺ , Al ³⁺ , Si ²⁺ , Si ⁴⁺ , Cr ³⁺ , Ga ³⁺ , Mg ²⁺ , Zn ²⁺ , Zn ³⁺ , Mn ²⁺ , Mn ³⁺ and Mn ⁴⁺ are at least one selected from the group consisting of,
The organic ligand is at least one selected from the group consisting of aromatic dicarboxylic acid, aromatic tricarboxylic acid, tetrazole-based compound, pyrazole-based compound, aromatic sulfonic acid, aromatic phosphoric acid, aromatic sulfinic acid, aromatic phosphinic acid, and bipyridine-based compound. organic light emitting display device. According to claim 1,
The dam structure suppresses penetration of moisture and oxygen from a side surface of the organic light emitting diode display. According to claim 1,
The hydrotalcite is an organic light emitting diode display represented by the following formula (2).
[Formula 2]
Mg _x Al _y (OH) _2x+3y-2z (CO ₃ ) _z aH ₂ O
(In Formula 2, x is a real number that satisfies 3<x<8, y satisfies 1<y<3, and z satisfies 0<z<4) According to claim 1,
The porous nanomaterial is an inorganic material, an organic material, or an organic-inorganic composite material having a pore size of 1 nm to 50 nm. delete delete According to claim 1,
The porous nanomaterial is a metal organic structure solvate mixed with the metal organic structure and solvent molecules,
The solvent molecules are ethanol, ethanol, propanol, isopropanol, butanol, N,N-dimethylformamide (DMF), N,N-diethylformamide (DEF), acetonitrile, chloroform, normal hexane (n-Hexane), An organic light emitting diode display of at least one selected from the group consisting of benzene, toluene, xylene, diethyl ether, acetone, and water. According to claim 1,
The metal ion constituting the metal organic structure is an aluminum ion (Al ³⁺ ). According to claim 1,
The base resin is an olefin resin. According to claim 1,
The dam structure comprises 10 wt% to 40 wt% of the hydrotalcite, and 1 wt% to 20 wt% of the porous nanomaterial. 2. The method of claim 1
An organic light emitting diode display having a light transmittance of 90% or more of the dam structure. According to claim 1,
Each of the plurality of sub-pixels has an emission area and a transmission area. According to claim 1,
The organic light emitting device emits white light,
The organic light emitting diode display further comprising a color filter formed on a partial region of the upper substrate. According to claim 1,
and an encapsulation layer disposed between the organic light emitting device and the filling part and covering the organic light emitting device.

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