KR100652034B1 - Seal cover plate and sealing mehtod of organic electroluminescence display device - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a seal cover plate and a sealing method of an organic EL display element, wherein the seal cover plate of the organic EL display element is each positioned at a position where a plurality of first electrodes and a second electrode cross each other perpendicular to each other. In an organic EL display element having an organic light emitting layer and having a seal cover plate covering the organic light emitting layer, the organic light emitting layer has a predetermined space between an upper surface and a lower surface of the seal cover plate, and has a first hole in an upper and lower direction in an area of the predetermined space. And a seal cover plate having a second hole formed therein, and after the seal cover plate is adhered to the organic EL display element, a moisture absorbent is put into a predetermined space of the seal cover plate to significantly shorten the process during mass production or increase the yield of good products. Prevents device defects due to dispersion of moisture absorbents, seal cover play By expanding the inner space it can be increasing the amount of absorbent increase the water removal effect in the device.

Organic EL display element, seal cover plate

Description

Seal cover plate and sealing method of organic EL display element {SEAL COVER PLATE AND SEALING MEHTOD OF ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE}

1 is a cross-sectional view of a sealing of a general organic EL display element.

2A to 2C are cross-sectional views of a sealing process of the organic EL display element according to the present invention.

3 is a cross-sectional view of a sealing of the organic EL display element according to the present invention.

* Explanation of symbols for main parts of the drawings

1 glass substrate 2 first electrode

3: organic EL layer 4: second electrode

5: protective film layer 6: epoxy resin

7: seal cover plate

8: absorbent 9: support film

10: suture

The present invention relates to a seal cover plate and a sealing method of an organic EL display element.

The organic EL display element injects charge through the electrode into an organic EL layer formed between the electron injection electrode (second electrode) and the hole injection electrode (first electrode), and the injected electrons and holes are paired and then disappear. It is a device that emits light.

The organic EL display element can not only form the element on a flexible transparent substrate such as plastic, but also can be driven at a voltage lower than 10 V compared to plasma display panel (PDP) or inorganic EL panel display. It is possible, and also the power consumption is relatively low, the color is excellent.

Its application has been limited due to the stability of the organic EL display element.

In other words, organic materials used to fabricate an organic EL display element are inferior in stability to most inorganic materials.

And, above all, the organic EL display element is vulnerable to moisture and oxygen, which hinders long life. Therefore, development for completely isolating the organic EL display element from the external atmosphere is in progress.

1 is a cross-sectional view generally encapsulating an organic EL display element.

As shown in FIG. 1, the first electrode 2 formed of the ITO transparent electrode on the glass substrate 1, the organic EL layer 3, the second electrode 4, and the second electrode 4 are disposed on the glass substrate 1. An organic EL panel is comprised from the protective film layer 5 formed from any one or more of a moisture absorption layer and a moisture proof layer.

In order to seal the organic EL display element, a seal cover plate 7 formed by forming and curing an epoxy resin 6 on a predetermined region of the glass substrate 1 and a seal cover plate 7 inside the seal cover plate 7. It is composed of a moisture absorbent (getter) 8 in the form of a powder formed on the support film 9 and the moisture absorbent 8.

In the sealing of the organic EL display element, the hygroscopic agent 8 is first injected into the seal cover plate 7 and then the support film 9 is formed to seal the seal cover plate 7 on which the support film 9 is formed. It is made by attaching to the said glass substrate 1 using (6) etc.

However, since the seal cover plate and the sealing method of the organic EL display device according to the related art described above cover the support film in the form of the moisture absorbent (getter) in the process of putting the absorber (getter) in the seal cover plate, the powder is blown to the organic EL device There is a problem of poor sample and difficult to inject the absorbent during mass production.

Accordingly, the present invention has been made to solve the above problems, and improves the internal structure and shape of the seal cover plate to improve the defective rate when sealing the organic EL display element and to minimize the penetration of moisture and oxygen It is an object of the present invention to provide a seal cover plate and a sealing method of an organic EL display element.

A feature of the seal cover plate of the organic EL display device according to the present invention for achieving the above object is that the organic light emitting layer is formed at a position where a plurality of first electrodes and a plurality of second electrodes cross each other perpendicularly, respectively, In an organic EL display element having a seal cover plate covering an organic light emitting layer, a predetermined space is formed between an upper surface and a lower surface of the seal cover plate, and a first hole and a second hole are disposed in an up-down direction in an area where the predetermined space is formed. It is comprised including the seal cover plate of the said organic electroluminescent display element formed.

A moisture absorbent injected into a predetermined space of the seal cover plate to suppress penetration of moisture and oxygen, a support film formed under the second hole and preventing the moisture absorber from falling, and formed on an upper portion of the first hole; It consists of a suture which seals one hole.

The predetermined space is formed in all or part of the seal cover plate.

The seal cover plate and the sealant are formed of any one of metal, glass, inorganic material, and organic material.

A feature of the sealing method of the organic EL display device according to the present invention for achieving the above object is that the organic light emitting layer is formed at a position where a plurality of first electrodes and a plurality of second electrodes cross each other perpendicularly, respectively, In a method of manufacturing an organic EL display element having a seal cover plate covering a light emitting layer, a predetermined space is formed between an upper surface and a lower surface of the seal cover plate, and the first hole and the second hole in the vertical direction in the region where the predetermined space is formed. Forming a formed seal cover plate, forming a support film under the second hole, injecting a moisture absorbent to inhibit penetration of moisture and oxygen into a predetermined space of the seal cover plate, and the moisture absorbent; It includes a step of suturing the first hole to seal the.

In accordance with an aspect of the present invention, there is a process of injecting a moisture absorbent absorbing moisture and oxygen in the device, and sealing the organic EL display device having a seal cover plate having a double structure in the center thereof, and then injecting a moisture absorbent. Therefore, the problem that the moisture absorbent falls on the organic EL display element can be prevented, and due to the double structure, it is less influenced by external force.

Other objects, features and advantages of the invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of a seal cover plate and a sealing method of an organic EL display element according to the present invention will be described with reference to the accompanying drawings.

2A to 2C are cross-sectional views of a sealing step of the organic EL display element according to the present invention.

As shown in FIG. 2A, the organic EL display element includes a first electrode 2 formed of an ITO transparent electrode on a glass substrate 1, an organic EL layer 3, a second electrode 4, and the second electrode. A protective film layer 5 formed of at least one of a moisture absorption layer and a moisture barrier layer on the electrode 4. The first electrode 2 is an anode and the second electrode 4 is a cathode.

And a seal cover plate 7 attached by forming and curing an epoxy resin 6 on a predetermined region of the glass substrate 1 to seal the organic EL display element.

One of the first electrode 2 formed of the ITO transparent electrode on the glass substrate 1, the organic EL layer 3, the second electrode 4, and the moisture absorption layer and the moisture barrier layer on the second electrode 4. After the protective film layer 5 formed above is formed one by one, the seal cover plate 7 is attached to the glass substrate 1 using the epoxy resin 6 or the like.

The seal cover plate 7 is formed in a double structure having a space corresponding to a predetermined area inside the seal cover plate 7.

That is, it has a double structure having a predetermined space between the upper surface and the lower surface of the seal cover plate, and has a structure in which the first hole and the second hole are formed in the vertical direction in the region where the predetermined space is formed.

As described above, since the seal cover plate 7 is formed in a double structure, the seal cover plate 7 is not only light in weight, but also acts as a buffer for protecting the organic EL display element from externally acting forces.

The first hole serves as an end-seal at the same time as the passage for injecting the absorbent 8.

Subsequently, as shown in FIG. 2B, the supporting film 9 is attached to the lower portion of the second hole formed in the lower direction of the space of the seal cover plate 7, and then formed in the upper direction of the space of the seal cover plate 7. The moisture absorbent 8 is injected through the first hole.

Subsequently, a suture 10 is formed on the first hole to seal the moisture absorbent 8 as shown in FIG. 2C.

The seal depends on which material is used, but generally, solder, high vacuum hardener, glass, plastic, or the like can be used.

In this case, the encapsulant 10 may use a plate-like structure made of the same or different material as the material used as the seal cover plate 7 to prevent the inflow of the gas discharged when the first hole is sealed. .

The material used as the seal cover plate 7 may be a material such as metal, glass, inorganic material, or organic material.

First, the seal cover plate (7) is adhered to the glass substrate (1), and after curing is completed, powder absorbent (8) can be put through the first hole using a thin tube, thereby reducing the difficulty of mass production process design. By shortening the (TACK) time, the production process can be simplified, the working environment can be improved and the yield of the product can be significantly increased, and the production time can be enhanced.

In addition, since the seal cover plate 7 is adhered to the glass substrate 1 and the curing is completed, the powder absorbent 8 can be put through the first hole by using a thin tube so that the dispersion of the absorbent 8 is injected during injection. It is possible to prevent the defect of the device due to the large area of the internal structure can overcome the limitation of the inner area of the seal cover plate (7), it is possible to increase the amount of the absorbent to increase the water removal effect in the device.

The seal cover plate and sealing method of the organic EL display element according to the present invention as described above has the following effects.

After the seal cover plate is adhered to the glass substrate and the curing is completed, the thin tube can be put in the form of a moisture absorbent through the first hole, thereby reducing the difficulty of the mass production process design and significantly shortening the process or increasing the yield of the product. It is possible to prevent the failure of the device due to the dispersion of the absorbent during injection.

By limiting the area of the inner space of the seal cover plate, it is possible to overcome the limitation of the inner area of the seal cover plate. Therefore, the amount of the absorbent may be increased to increase the water removal effect in the device.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (6)

In an organic EL display element having an organic light emitting layer formed at a position where a plurality of first electrodes and a plurality of second electrodes each perpendicularly intersect each other, and having a seal cover plate covering the organic light emitting layer, And a predetermined space is formed between an upper surface and a lower surface of the seal cover plate, and a first hole and a second hole are formed in an up-down direction in a region where the predetermined space is formed. The method of claim 1, A hygroscopic agent injected into a predetermined space of the seal cover plate to suppress penetration of water and oxygen; A support film formed under the second hole to prevent the moisture absorbent from falling; And a sealant formed on an upper portion of the first hole to seal the first hole. The seal cover plate of the organic EL display element according to claim 1, wherein the predetermined space is formed in all or part of the seal cover plate. The seal cover plate of an organic EL display element according to claim 1, wherein the seal cover plate is formed of any one of metal, glass, inorganic material and organic material. 3. The seal cover plate of the organic EL display element according to claim 2, wherein the sealant is formed of any one of metal, glass, inorganic material and organic material. In the method of manufacturing an organic EL display element having an organic light emitting layer formed at a position where a plurality of first electrodes and a plurality of second electrodes each perpendicularly intersect each other, and having a seal cover plate covering the organic light emitting layer, Forming a seal cover plate having a predetermined space formed between an upper surface and a lower surface of the seal cover plate, the seal cover plate having first holes and second holes formed in a vertical direction of an area where the predetermined space is formed; Forming a support layer under the second hole; Injecting a moisture absorbent into a predetermined space of the seal cover plate to suppress penetration of moisture and oxygen; And sealing the first hole to seal the moisture absorbent.

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