KR100622251B1 - Organic light-emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device in which sealing substrates are formed on both sides of an organic light emitting layer, thereby preventing moisture from penetrating efficiently and preventing a reduction of dead space. The present invention is a transparent material which is provided on the surface of the first substrate, the organic light emitting portion formed on one surface of the first substrate, the organic light emitting portion of the first substrate is formed, the edge is bent and bonded to the other surface of the first substrate A second substrate, a first moisture absorption layer of a transparent material provided between the first substrate and the second substrate, and is provided on the other surface side of the first substrate on which the second substrate is mounted, the second substrate being bonded to the And a third substrate of opaque material for sealing the first substrate, and a second moisture absorption layer of opaque material provided between the first substrate and the third substrate.

OLED display, moisture absorption layer, encapsulation structure, front emission

Description

Organic light-emitting display device

1 is a cross-sectional view of a conventional organic light emitting display device having a bracket.

Figure 2 is a graph showing the moisture absorption amount of the transparent absorbent material and the opaque absorbent material.

3 is a photograph showing a phenomenon in which dark spots occur in pixels of an organic light emitting diode.

4 is a photograph showing a phenomenon in which pixel contraction occurs in a pixel of an organic light emitting diode.

5 is a cross-sectional view of an organic light emitting display device according to an embodiment of the present invention.

6 is a cross-sectional view of an organic light emitting display device according to another exemplary embodiment of the present invention.

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device in which sealing substrates are formed on both sides of an organic light emitting layer to prevent moisture from penetrating efficiently and to reduce the area of the light emitting area. .

In the organic light emitting display, when the organic light emitting layer is positioned between the electrodes facing each other, and a voltage is applied between both electrodes, electrons injected from one electrode and holes injected from the other electrode are combined in the organic light emitting layer. It is one of the flat panel display devices that emit energy emitted by light when the light emitting molecules of the light emitting layer are excited and then return to the ground state through bonding.

An organic light emitting display device having such a light emission principle is attracting attention as a next-generation display because of its excellent visibility, weight reduction, thin film thickness, and low voltage operation.

However, the organic light emitting layer of the aforementioned organic light emitting display device is vulnerable to moisture and requires an encapsulation structure for protecting the organic light emitting layer with moisture. 1 is a cross-sectional view of a conventional organic light emitting display device. Accordingly, the organic light emitting display device includes a first substrate 10 including an organic light emitting unit on one surface thereof, and a moisture absorbing layer 25 for protecting the organic light emitting unit 15 from outside air and absorbing moisture penetrated therein. It includes, and comprises a second substrate 20 is coupled to the first substrate 10 opposite. In addition, a bottom surface of the second substrate 20 is provided with a bracket 40 made of metal for supporting the display device.

In this case, when the light is emitted through the second substrate 20, the second substrate 20 should be made of a transparent material, and since the moisture absorption layer attached to the second substrate 20 also exists on the light emitting surface, the transparent material Should consist of However, a moisture absorbing layer of a transparent material, for example, calcium oxide (CaO) or the like, has a significantly lower moisture absorbing ability than an opaque moisture absorbing layer, which is disadvantageous for water absorption. This is confirmed in FIG. 2, which is a graph showing the moisture absorption amount over time of the transparent moisture absorbing layer and the opaque moisture absorbing layer.

 When the moisture absorbing ability of the moisture absorbing layer is lowered, the organic light emitting element is deteriorated, so that a dark spot is generated or a defect in which pixel shrinkage occurs. 3 and 4 are photographs showing a phenomenon in which dark spots and pixel contractions occur in pixels of the organic light emitting diode, respectively.

Therefore, in the organic light emitting display device, it is important to use a moisture absorbing layer having excellent moisture absorption ability. Accordingly, changes in various materials or mounting structures of the moisture absorbing layer have been studied.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an organic light emitting display device which can include a large amount of the moisture absorbing layer by changing the mounting structure of the moisture absorbing layer.

Another object of the present invention is to provide an organic light emitting display device having excellent hygroscopic ability and no area reduction of the light emitting area by the hygroscopic layer.

The present invention is a transparent material which is provided on the surface of the first substrate, the organic light emitting portion formed on one surface of the first substrate, the organic light emitting portion of the first substrate is formed, the edge is bent and bonded to the other surface of the first substrate A second substrate, a first moisture absorption layer of a transparent material provided between the first substrate and the second substrate, and is provided on the other surface side of the first substrate on which the second substrate is mounted, the second substrate being bonded to the And a third substrate of opaque material for sealing the first substrate, and a second moisture absorption layer of opaque material provided between the first substrate and the third substrate.

In addition, the present invention is provided on the surface side of the first substrate of the transparent material, the organic light emitting portion formed on one surface of the first substrate, the organic light emitting portion of the first substrate, the edge is bent to the first substrate A second substrate of transparent material bonded to the other surface of the first substrate, a first moisture absorption layer of transparent material provided between the first substrate and the second substrate, and a second surface of the first substrate provided with the second substrate, And a third substrate of transparent material bonded to a second substrate to seal the first substrate, and a second moisture absorption layer of transparent material disposed between the first substrate and the third substrate. .

Hereinafter, an embodiment of a top emission type organic light emitting diode display according to the present invention will be described in detail with reference to FIG. 5. Accordingly, the organic light emitting display device includes a first substrate 110 including an organic light emitting unit, a second substrate 120 including a first moisture absorption layer 125, and a third substrate including a second moisture absorption layer 135. And 130.

The first substrate 110 is a substrate on which the organic light emitting part 115 is formed. Since the first substrate 110 is a top emission type, the first substrate 110 does not emit light to the rear side. The organic light emitting unit 115 includes a pair of electrodes facing each other, and an organic light emitting device including at least an organic light emitting layer disposed between the electrodes. At this time, the organic light emitting element is not limited to take any form of passive driving type or active driving type. In addition, the material, the configuration, and the like of the organic light emitting device are not limited in this embodiment, and thus detailed description thereof is omitted.

In the present embodiment, the second substrate 120 is an encapsulation substrate including the first moisture absorption layer 125, and forms a predetermined space between the first substrate 110 and the edge of the first substrate 110. Sealed along, the organic light emitting unit 115 is blocked from external moisture. The space between the first substrate 110 and the second substrate 120 may be formed in a nitrogen-rich state or filled with an inert gas such as argon to lower the oxygen fraction.

Since the second substrate 120 is top-emitting, it is formed of a transparent material, and glass or transparent plastic may be used. The second substrate 120 has a cap shape in which both ends are bent twice. That is, the second substrate 120 is formed in a structure surrounding the first substrate 110, and is positioned on one surface side of the first substrate 110, and an extended and bent edge is formed on the other surface of the first substrate 110. Combined. At this time, the sealing material 170 is provided on a surface where the first substrate 110 and the second substrate 120 contact.

A space is formed between the first substrate 110 and the second substrate 120, where the first moisture absorption layer 115 is formed. The first moisture absorption layer 115 is formed of a transparent material, and the material selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, metal halides, metal sulfates, metal perchlorates, and phosphorus pentoxide may be formed. One or more materials can be used as the porous nanoparticles.

The third substrate 130 is a substrate for encapsulating the first substrate 110 on the opposite side of the second substrate 120, and forms a predetermined space between the first substrate 110 and the second substrate 120. Is coupled to the end of the At this time, the sealing member 180 is provided on the contact surface between the edge of the second substrate 120 and the third substrate 130 to seal the first substrate 110 from the outside.

The third substrate 130 is formed of an opaque material in the front light emitting structure. Although there is no limitation of the opaque material, the third substrate 130 is preferably made of a metal material so that the third substrate 130 can be used for the purpose of the bracket. At this time, one or more materials selected from the group consisting of aluminum (Al), iron (Fe), copper (Cu), chromium (Cr), nickel (Ni), and molybdenum (Mo). Preferably, the metal material may include silicon, manganese, phosphorus, sulfur, carbon and the like. Meanwhile, a person skilled in the art will recognize that the third substrate 130 is formed in a plate shape in this embodiment, but may be formed in a cap shape.

A second moisture absorption layer 135 is included between the first substrate 110 and the third substrate 130, and the second moisture absorption layer 135 may also be made of an opaque material. The opaque material that can be used as the second moisture absorption layer 135 may be at least one material selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, metal halides, metal sulfates, metal perchlorates, and phosphorus pentoxide. .

The second moisture absorption layer 135 made of an opaque material is not only excellent in moisture absorption ability, but also positioned between the first substrate 110 and the third substrate 130, which can secure a large amount of space. The penetration of water can be effectively prevented.

In addition, when the third substrate 130 is formed of a metal as described above, it is not necessary to provide a separate metal bracket as in the prior art, and the sealing members 170 and 180 are located on opposite sides of the light emitting direction. Therefore, there is an advantage that does not involve reduction of the light emitting area.

Hereinafter, referring to FIG. 6, a double-emitting organic light emitting display device according to a second embodiment of the present invention will be described. The second embodiment has a similar configuration to the first embodiment, but differs in terms of double-sided light emission and structure of the second substrate.

Referring to FIG. 6, the organic light emitting diode display includes a first substrate 110 including an organic light emitting unit, a second substrate 120 including a first moisture absorption layer 125, and a second moisture absorption layer 135. Is configured to include a third substrate 130.

The first substrate 110 is a substrate on which the organic light emitting unit 115 is formed, and is formed of a transparent material because it is a double-sided light emitting type. The organic light emitting unit 115 includes a pair of electrodes facing each other, and an organic light emitting device including at least an organic light emitting layer disposed between the electrodes. At this time, the organic light emitting element is not limited to take any form of passive driving type or active driving type. In addition, the material, the configuration, and the like of the organic light emitting device are not limited in this embodiment, and thus detailed description thereof is omitted.

In the present embodiment, the second substrate 220 is an encapsulation substrate including the first moisture absorption layer 225, and forms a predetermined space between the first substrate 210 and the edge of the first substrate 210. The organic light emitting part 215 is blocked along with water from external moisture. The space between the first substrate 210 and the second substrate 220 may be formed in a nitrogen-rich state or filled with an inert gas such as argon to lower the oxygen fraction.

Since the second substrate 220 is double-sided light emission, it is formed of a transparent material, and glass or transparent plastic may be used. The second substrate 220 is configured in a shape having a recess in which the first substrate 210 can be fitted. That is, the second substrate 220 is formed in a structure having grooves into which end portions of the first substrate 210 may be fitted. The first substrate 210 may be positioned on one surface side of the first substrate 210, and the extended and bent end may be coupled to the other surface of the first substrate 210.

A space is formed between the first substrate 210 and the second substrate 220, where the first moisture absorption layer 215 is formed. Due to the double-sided light emitting structure, the first moisture absorbing layer 215 should be formed of a transparent material, for example, a group consisting of an alkali metal oxide, an alkaline earth metal oxide, a metal halide, a metal sulfate, a metal perchlorate and phosphorus pentoxide One or more materials selected from may be used by constructing porous nanoparticles.

The third substrate 230 is a substrate for encapsulating the first substrate 210 on the opposite side of the second substrate 220, and forms a predetermined space between the first substrate 210 and the second substrate 220. Is coupled to the end of the At this time, the sealing member 280 is provided on the contact surface between the end of the second substrate 220 and the third substrate 230 to seal the first substrate 210 from the outside.

The third substrate 230 is formed of a transparent material in the double-sided light emitting structure, there is no limitation of the transparent material, glass or transparent polymer may be used. Meanwhile, a person skilled in the art will recognize that the third substrate may be formed in a plate shape in the present embodiment, but may also be formed in a cap shape.

The second moisture absorption layer 235 is included between the first substrate 210 and the third substrate 230. In the double-sided light emitting structure, the third substrate 230 is formed of a transparent material, and the second moisture absorption layer 235 formed on the third substrate 230 should also be made of a transparent material. As the transparent material that may be used as the second moisture absorbing layer 235, the materials described in the first moisture absorbing layer 215 may be used.

Since the second moisture absorbing layer 235 made of a transparent material is located between the first substrate 210 and the third substrate 230, which can secure a lot of space even if formed of a transparent material, moisture penetrates into the organic light emitting device. Can be prevented efficiently. In addition, since the sealing members 270 and 280 are overlapped, there is an advantage of not reducing the light emitting area.

Hereinafter, a method of manufacturing an organic light emitting display device according to the present invention will be described with reference to FIG. 5. A first substrate 110 is provided, a first electrode is formed on the first substrate 110, and an organic light emitting layer is formed on the first electrode. In this case, the organic light emitting layer is essentially a concept including a light emitting layer and includes hole-related layers such as a hole injection layer and a hole transport layer, and electron-related layers such as an electron injection layer and an electron transport layer. The organic light emitting unit 115 is completed by forming a second electrode, a passivation film, a planarization film, and the like on the organic light emitting layer.

Meanwhile, a first moisture absorption layer 125 is formed on a surface of the second substrate 120 facing the organic light emitting layer of the first substrate 110, and the second substrate 120 is formed on the first substrate. Attach to (110). At this time, the second substrate 120 is bonded along the edge of the first substrate 110 to form a predetermined space between the first substrate 110 and the second substrate 120, and the first substrate 110. The part where the second substrate 120 is in contact with each other is sealed, and the sealing member 170 is used at the time of sealing.

The third substrate 130 is attached to the second substrate 120 on the surface opposite to the second substrate 120. A second moisture absorbing layer 135 is formed on the third substrate 130, and the second moisture absorbing layer 135 may be formed by attaching a moisture absorbing film to a double-sided tape, or by screen printing or sputtering. The third substrate 130 is bonded along the edge of the second substrate to form a predetermined space between the second substrate 120 and the third substrate 130. The contact area between the second substrate 120 and the third substrate 130 is sealed, and the sealing material 180 is used at the time of sealing.

Although the present invention has been described primarily with reference to the above embodiments, many other possible modifications and variations can be made without departing from the spirit and scope of the invention. For example, the third substrate may be attached to the first substrate or the second substrate in more various shapes, and the type of the moisture absorbent formed therein may also be variously modified.

The organic light emitting display device according to the present invention has an effect of effectively blocking moisture penetrating into the organic light emitting device that is vulnerable to moisture.

In addition, since the sealing materials are overlapped with each other, even when the moisture absorbing layer is formed in duplicate, there is an advantage in that it is possible to largely prevent the reduction of the light emitting area of the OLED display.

The scope of the above-described invention is defined in the following claims, and is not bound by the description in the text of the specification, all modifications and variations belonging to the equivalent scope of the claims will fall within the scope of the present invention.

Claims (15)

First substrate, An organic light emitting part formed on one surface of the first substrate, A second substrate of a transparent material provided on a surface side of the first substrate where the organic light emitting part is formed and bent at an edge thereof to bond to the other surface of the first substrate, A first moisture absorption layer of a transparent material provided between the first substrate and the second substrate, A third substrate of opaque material which is provided on the other side of the first substrate on which the second substrate is installed and is coupled to the second substrate to seal the first substrate, and And a second moisture absorption layer of an opaque material disposed between the first substrate and the third substrate. The method of claim 1, And the third substrate comprises a metal material. The method of claim 2, wherein the metal material is one or more selected from the group consisting of aluminum (Al), iron (Fe), copper (Cu), chromium (Cr), nickel (Ni), and molybdenum (Mo). An organic light emitting display device. The method of claim 1, The second moisture absorbing layer is at least one or more materials selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, metal halides, metal sulfates, metal perchlorates, and phosphorus pentoxide. . The method of claim 1, And the third substrate has a plate shape. The method of claim 1, The organic light emitting display device of claim 2, wherein a sealing material is provided on a bonding surface of the second substrate and the third substrate. The method of claim 1, The first moisture absorption layer is formed on the second substrate. The method of claim 1, The second moisture absorption layer is formed on the third substrate. A first substrate of transparent material, An organic light emitting part formed on one surface of the first substrate, A second substrate of a transparent material provided on a surface side of the first substrate where the organic light emitting part is formed and bent at an edge thereof to bond to the other surface of the first substrate, A first moisture absorption layer of a transparent material provided between the first substrate and the second substrate, A third substrate of a transparent material provided on the other surface side of the first substrate on which the second substrate is provided and coupled to the second substrate to seal the first substrate, and And a second moisture absorbing layer of transparent material disposed between the first substrate and the third substrate. The method of claim 9, And the third substrate is glass or a transparent polymer. The method of claim 9, The second moisture absorption layer is an organic light emitting display device comprising one or more materials selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, metal halides, metal sulfates, metal perchlorates, and phosphorus pentoxide with porous nanoparticles. . The method of claim 9, And the third substrate has a plate shape. The method of claim 9, The organic light emitting display device of claim 2, wherein a sealing material is provided on a bonding surface of the second substrate and the third substrate. The method of claim 9, The first moisture absorption layer is formed on the second substrate. The method of claim 9, The second moisture absorption layer is formed on the third substrate.

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