KR100759412B1 - Organic light emitting display device - Google Patents

Abstract

An organic light emitting display device is provided to prevent a short due to the contact between a desiccant and a pixel by forming the circumference of the desiccant thinly. An organic light emitting display device(100) includes a substrate(10), an organic light emitting unit(20), an encapsulation substrate(30), and a desiccant(50). The organic light emitting unit(20) is formed on one surface of the substrate(10). The encapsulation substrate(30) faces the substrate(10), and is sealed with the substrate(10) while interposing the organic light emitting unit(20). The desiccant(50) is formed on one surface which faces the substrate(10) of the encapsulation substrate(30). The circumference of the desiccant(50) is formed to be thinner than the central part.

Description

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

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

FIG. 2 is a partially enlarged cross-sectional view of FIG. 1.

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 structure which prevents a defective phenomenon caused by contact of a moisture absorbent with a pixel by adjusting the shape of the moisture absorbent.

In the organic light emitting diode display, electrons and holes injected into the organic material through an anode and a cathode recombine to form an exciton, and light having a specific wavelength is generated by energy from the exciton formed. It is a self-luminous display device using the phenomenon which occurs.

The organic light emitting diode display is attracting attention as a next-generation display device because it does not require a separate light source such as a backlight, and thus has low power consumption and easy securing of a wide viewing angle and fast response speed compared to the liquid crystal display.

The light emitting device of the organic light emitting diode display includes an anode electrode which is a hole injection electrode, an organic thin film layer, and a cathode electrode which is an electron injection electrode, and the organic thin film layer includes red (R), green (G; Green), and blue (Blue; B) is made up of each organic material emitting B) to achieve full color.

In addition, the organic thin film layer has a multilayer structure including an emitting layer (EML), an electron transport layer (ETL), and a hole transport layer (HTL) to improve the light emission efficiency by improving the balance between electrons and holes. In some cases, it may further include a separate electron injection layer (EIL) and a hole injection layer (HIL).

However, the organic light emitting diode display has a property of deterioration due to infiltration of moisture, and thus the penetration of moisture into the organic light emitting diode display should be prevented.

To this end, a general organic light emitting display device includes a desiccant therein, which is mounted in a powder form in a groove formed in a metal can or a glass substrate, or manufactured in a film form to use a double-sided tape. Can be glued.

However, as the thickness of the organic light emitting diode display is reduced, the distance between the moisture absorbent and the pixel formed on the substrate of the organic light emitting diode display is narrowed. As a result, when the external pressure is applied to the organic light emitting diode display, the risk of the pixel and the moisture absorbent coming into contact with each other increases. The contact of the pixel with the moisture absorbent may cause a short circuit.

In particular, when the end of the absorbent is located between the partitions formed to separate the electrodes of the pixel, there is a problem that the end of the absorbent is easily in contact with the pixel.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to prevent the short-circuit phenomenon of pixels by contacting the absorbent and the pixels of the organic light emitting diode display. To provide.

In order to achieve the above object, the organic light emitting diode display according to the present invention includes a substrate, an organic light emitting part formed on one surface of the substrate, an encapsulation substrate encapsulated with the substrate with the organic light emitting part therebetween, and a substrate side of the encapsulation substrate. It includes a moisture absorbent formed on one side facing, the moisture absorbent is formed thinner than the edge portion of the central portion.

In this case, the moisture absorbent may have a tapered shape at its edge.

In this case, the organic light emitting part may include a first electrode formed in a predetermined pattern on the substrate, an organic thin film layer formed on the first electrode, a second electrode formed on the organic thin film layer, and a plurality of second electrode formed on the first electrode to partition the second electrode. And partitions of the absorbent may be disposed between the partitions.

In addition, the partitions may be arranged in a stripe pattern.

In addition, the moisture absorbent may be attached to the encapsulation substrate by a tape.

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

1 is a cross-sectional view of an organic light emitting diode display 100 according to an exemplary embodiment of the present invention. Referring to the drawings, the organic light emitting diode display 100 is formed on the substrate 10 and the organic light emitting portion 20 and the organic light emitting portion 20 formed on one surface of the substrate 10 to seal the substrate 10. The encapsulation substrate 30 is included.

In addition, a sealing material 40 is disposed between the substrate 10 and the encapsulation substrate 30 to seal the substrate 10 and the encapsulation substrate 30 to each other.

The substrate 10 may be made of an insulator such as glass or plastic.

In addition, the encapsulation substrate 30 may be formed of a material such as a metal cap, a transparent glass material, or a transparent plastic material. However, the encapsulation substrate 30 is transparent in the case of a top emission type or a double-sided emission type organic light emitting display device in which an image is realized in the direction of the encapsulation substrate 30 or in both directions of the substrate 10 and the encapsulation substrate 30. It may be formed of a glass material or a transparent plastic material.

In addition, the inner surface of the encapsulation substrate 30 facing the organic light emitting portion 20 is provided with a moisture absorbent 50 for absorbing moisture in the space between the substrate 10 and the encapsulation substrate 30.

The moisture absorbent 50 may be formed of a material including a strong hygroscopic material such as alkali metal oxide, alkaline earth metal oxide, rare earth oxide, aluminum oxide or zeolite. The moisture absorbent 50 may be attached to the encapsulation substrate 30 with a tape 52.

In addition, as shown, the moisture absorbent 50 may be formed in a shape in which the edge portion thereof is formed thinner than the central portion. The shape of this moisture absorbent 50 is mentioned later.

On the other hand, a pad area on which the encapsulation substrate 30 is not disposed on the substrate 10 is connected to the electrode layers disposed in the organic light emitting unit 20 and has wirings for inputting and outputting signals to the outside. Is formed.

FIG. 2 is a partially enlarged cross-sectional view of FIG. 1. As shown in FIG. 2, the organic light emitting part 20 formed on the substrate 10 has a structure in which the first electrode 22, the organic thin film layer 24, and the second electrode 26 are sequentially stacked.

In this case, the first electrode 22 may be an anode electrode, and the second electrode 26 may be a cathode electrode.

On the other hand, the organic thin film layer 24 may be made of a low molecular organic material or a high molecular organic material. When the organic thin film layer 24 is made of a low molecular organic material, a hole injection layer (HIL), a hole transport layer (HTL), an emitting layer (EML), and an electron transport layer (ETL) It may be made of a multi-layer structure including.

On the other hand, when the organic thin film layer 24 is made of a polymer organic material, it may be composed of a hole transport layer (HTL) and an emitting layer (Emitting Layer; EML), wherein the HTL is made of a PEDOT material and the EML is poly-phenylene Poly-Phenylenevinylene (PPV) -based or polyfluorene (Polyfluorene) may be made of a material.

Meanwhile, a partition wall 28 for separating the second electrode 26 may be formed on the first electrode 22. The partition wall 28 may be formed on the first electrode 22 in a stripe pattern.

In addition, as shown in the figure, the cross-sectional shape of the partition wall 28 has a trapezoidal shape in which the width of the upper portion is wider than the width of the lower portion, and may serve as a mask when the organic thin film layer 24 and the second electrode 26 are deposited. .

In addition, as described above, the moisture absorbent 50 has an edge including the end thereof is formed thinner than the central portion.

In the drawings, for example, the thickness gradually becomes thinner from the center to the edge, that is, a taper shape, but the present invention is not limited to this, but the moisture absorbent 50 is the end and the center has a step It may be made in the shape of a step having.

When pressure is applied from the outside of the organic light emitting diode display, the central portion of the moisture absorbent 50 is in contact with the partition 28 so as not to contact the organic light emitting portion 20. In other words, the partition wall 28 serves as a kind of spacer.

In addition, as described above, as the end of the moisture absorbent 50 is formed thinner than the center portion, even if pressure is applied from the outside, the moisture absorbent 50 and the organic light emitting part 20 are prevented from contacting each other.

That is, even when the end portion of the moisture absorbent 50 is disposed between the partition walls 28, the thickness thereof is thin in the vicinity of the end portion so that the organic light emitting portion 20 does not come into contact with the end portion.

Accordingly, the short phenomenon of the pixel due to the contact of the moisture absorbent 50 is greatly reduced.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, according to the organic light emitting diode display and a method of manufacturing the same, a short phenomenon due to contact between the moisture absorbent and the pixels can be prevented by forming the edge of the moisture absorbent thinly.

Claims (5)

Board; An organic light emitting part formed on one surface of the substrate; An encapsulation substrate sealingly opposed to the substrate with the organic light emitting portion therebetween; And Hygroscopic agent formed on one surface of the encapsulation substrate facing the substrate side Including, The organic light emitting diode display device, wherein the moisture absorbent is formed thinner than an edge portion thereof. According to claim 1, And the moisture absorbent has a tapered shape at an edge thereof. According to claim 1, The organic light emitting unit, A first electrode formed on the substrate; An organic thin film layer formed on the first electrode; A second electrode formed on the organic thin film layer; And A plurality of partition walls formed on the first electrode to partition the second electrode Including, And an end portion of the moisture absorbent disposed between the partition walls. The method of claim 3, wherein An organic light emitting display device in which the partitions are arranged in a stripe pattern. According to claim 1, The moisture absorbent is attached to the encapsulation substrate by a tape.

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