KR100667359B1 - Mother Glass and Fabricating Method of Organic Electro Luminescence Device Using The Same - Google Patents

Abstract

The present invention relates to a mother substrate capable of preventing device defects by improving adhesion of an insulating material and a method of manufacturing an organic light emitting display device using the same.

A mother substrate having a plurality of organic light emitting arrays according to the present invention, characterized in that it comprises a transparent material pattern located in the outer region of the mother substrate and formed in a band shape to surround the plurality of organic electroluminescent arrays. .

Description

Mother Glass and Fabricating Method of Organic Electro Luminescence Device Using The Same}             

1 is a view schematically showing a conventional organic electroluminescent display device.

2 is a diagram for explaining the light emission principle of a conventional organic electroluminescent device.

3 is a diagram illustrating a mother substrate on which a plurality of organic light emitting arrays are formed.

4A and 4B are diagrams for explaining adhesion failure of conventional insulating materials.

5 is a view showing a mother substrate for an organic light emitting display device according to the present invention.

FIG. 6 is a view illustrating region A shown in FIG. 5 in detail, and FIG. 7 is a cross-sectional view taken along line II ′.

8A to 8F are views illustrating a method of manufacturing an organic light emitting display device using the mother substrate shown in FIG. 7.

9 is a view showing the formation of an insulating material.

      <Explanation of symbols for the main parts of the drawings>

2,102: substrate 4,104: anode electrode

8,108: partition 10,110: organic light emitting layer

12,112: cathode electrode 28,128: cap

25,125 Sealant 150 Transparent material pattern

6a, 106a: photosensitive insulating material

The present invention relates to an organic light emitting display device, and more particularly, to a mother substrate capable of improving adhesion of an insulating material and a method of manufacturing the organic light emitting display device using the same.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such a flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, and an electroluminescence display device. And the like). In particular, the EL display device is basically formed by attaching electrodes to both sides of an organic light emitting layer including a hole transporting layer, a light emitting layer, and an electron transporting layer, and has attracted attention as a next-generation flat panel display because of its wide viewing angle, high opening ratio, and high color.

Such EL display elements are largely divided into inorganic EL display elements and organic EL display elements depending on the materials used. Among them, the organic EL display device can be driven at a lower voltage than the inorganic EL display device because when the charge is injected into the organic EL layer formed between the hole injection electrode and the electron injection electrode, electrons and holes are paired and extinguished to emit light. Has the advantage. In addition, the organic EL display device can be formed on a flexible transparent substrate, such as plastic, and can be driven at a voltage lower than 10V compared to a PDP or an inorganic EL display device, and the power consumption is relatively low. Small, excellent color

1 is a cross-sectional view schematically showing a conventional organic EL display element, and FIG. 2 is a view for explaining the light emission principle of the organic EL display element shown in FIG.

The organic EL display device illustrated in FIG. 1 includes a first electrode (or anode electrode) 4 and a second electrode (or cathode electrode) formed on the substrate 2 so as to cross each other with an organic light emitting layer 10 interposed therebetween. 12) and an organic EL array 15 including a cap and a cap 28 for packaging the organic EL array 15.

A plurality of anode electrodes 4 of the organic EL array 15 are spaced apart at predetermined intervals on the substrate 2. On the substrate 2 on which the anode electrode 4 is formed, an insulating film 6 having an opening for each EL cell EL region is formed. On the insulating film 6, a partition 8 for separating the organic light emitting layer 10 and the cathode electrode 12 to be formed thereon is positioned. The partition wall 8 is formed in a direction crossing the anode electrode 4 and has a reverse taper structure in which the upper end portion has a wider width than the lower end portion. On the insulating film 6 on which the partition 8 is formed, the organic light emitting layer 10 and the cathode electrode 12 made of an organic compound are sequentially deposited on the entire surface. The organic light emitting layer 10 includes an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer.

The organic EL array 15 has a property of being easily degraded by moisture and oxygen. To solve this problem, an organic EL array 15 is formed by encapsulation process in which the substrate 2 and the cap 28 on which the organic EL array 15 is formed are bonded through a sealant 25 such as an epoxy resin. ) Is protected from oxygen and moisture.

The cap 28 is provided with a getter 22 which is located on a surface facing the organic EL array 15 and absorbs moisture and oxygen. Here, the getter 22 reacts with an inorganic oxide, that is, moisture Calcium oxide (Cao), barium oxide (BaO), and the like forming hydroxyl group (OH) are used.

In the organic EL display device, as shown in FIG. 2, when a voltage is applied between the anode electrode 4 and the cathode electrode 12, electrons generated from the cathode electrode 12 are transferred to the electron injection layer 10a and the electron. It moves toward the light emitting layer 10c through the transport layer 10b. In addition, holes generated from the anode electrode 4 move toward the light emitting layer 10c through the hole injection layer 10e and the hole transport layer 10d. Accordingly, in the light emitting layer 10c, excitons are formed by recombination of electrons and electrons supplied from the electron transport layer 10b and the hole transport layer 10d, and the excitons are excited to the ground state and emit light of constant energy. The image is displayed by being discharged to the outside through the anode electrode 4.

In the organic EL display device, as shown in FIG. 3, the mother substrate 3 having the plurality of organic EL arrays 15 formed thereon is bonded to the cap 28 by an encapsulation process, and then, by a scribing process. It is formed by cutting.

Meanwhile, in the process of forming the organic EL array 15 on the conventional mother substrate 3, an insulating material used to form the insulating film 6 in the outer region of the mother substrate 3 is partially formed in the substrate 2. Peeling phenomenon such as separation occurs.

This will be described in detail with reference to FIGS. 4A and 4B.

First, the transparent conductive material is deposited on the mother substrate 3 and then patterned by a photolithography process and an etching process to form the anode electrode 4 as shown in FIG. 4A.

Thereafter, the photosensitive insulating material 6a is coated on the substrate 2 on which the anode electrode 4 is formed by a spin-coating method. At this time, since the transparent conductive material is not formed below the photosensitive insulating material 6a positioned in the outer region of the mother substrate 3, the interfacial energy between the photosensitive insulating material 6a and the mother substrate 3 and the material characteristics. Due to the difference, etc., the adhesion is inferior. Accordingly, as shown in FIG. 4B, a peeling phenomenon occurs such that the photosensitive insulating material 6a is partially separated from the mother substrate 3. When such a peeling phenomenon occurs, a considerable error and a deviation occur in a patterning process that is performed later, thereby causing problems such as poor formation of the organic EL array 15.

Accordingly, it is an object of the present invention to provide a mother substrate capable of preventing device defects by improving adhesion of an insulating material.                         

Another object of the present invention is to provide a method of manufacturing an organic light emitting display device using a mother substrate having improved adhesion of an insulating material.

In order to achieve the above object, in the mother substrate formed with a plurality of organic electroluminescent array according to the present invention, the transparent material pattern formed in a band so as to surround the plurality of organic electroluminescent array is located in the outer region of the mother substrate. Characterized in that it comprises a.

The organic light emitting array includes first and second electrodes formed to cross each other with an organic light emitting layer interposed therebetween, and the transparent material pattern is made of the same material as any one of the first and second electrodes. .

In the method of manufacturing an organic light emitting display device according to the present invention, a plurality of first electrodes are formed on a mother substrate, and a transparent strip is formed to surround the plurality of first electrodes and is positioned in an outer region of the mother substrate in a band shape. Forming a material pattern; Forming an insulating material on the first electrode and the transparent material pattern; Patterning the insulating material to partially expose the first electrode to form an insulating film defining a light emitting area; Forming a partition on the insulating film; Forming an organic light emitting layer on the exposed light emitting region; Forming a second electrode intersecting the first electrode; Packaging a mother substrate on which the second electrode is formed by an encapsulation process; And cutting the packaged mother substrate by a scribing process.

At least a portion of the insulating material is formed to span the transparent material pattern.

An end of the insulating material is formed on the transparent material pattern.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 9.

FIG. 5 is a view schematically showing a mother substrate according to an embodiment of the present invention, FIG. 6 is a view showing region A shown in FIG. 5 in detail, and FIG. 7 is cut along line I-I 'of FIG. It is sectional drawing.

5 to 7, a plurality of organic EL arrays 115 are formed in the mother substrate 103, and a transparent material pattern 150 is formed in the outer region of the mother substrate 103.

A plurality of first electrodes (or anode electrodes 104) of the organic EL array 115 are formed on the substrate 103 at a predetermined interval. On the substrate 103 on which the anode electrode 104 is formed, an insulating film 106 having an opening for each EL cell EL region is formed. The partition 108 is disposed on the insulating layer 106 to separate the organic light emitting layer 110 and the second electrode (or the cathode electrode 112) to be formed thereon. The partition 108 is formed in a direction crossing the anode electrode 104 and has a reverse taper structure in which the upper end portion has a wider width than the lower end portion. On the insulating layer 106 on which the partition 108 is formed, the organic light emitting layer 110 and the cathode electrode 112 made of an organic compound are sequentially deposited on the entire surface. The organic light emitting layer 110 includes an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer.

The transparent conductive pattern 150 is formed of the same material as the anode electrode 104 of the organic EL array 115 so that an insulating material coated on the mother substrate 103 when the insulating layer 106 is formed is formed on the mother substrate 103. It is to prevent the peeling (Peeling) phenomenon such as partly separated.

In other words, since the transparent material pattern 150 is positioned between the mother substrate 103 and the photosensitive insulating material, a peeling phenomenon due to a difference in interfacial energy, material properties, etc. of the photosensitive insulating material and the mother substrate 103 is prevented. As a result, a significant error and deviation are reduced in the subsequent patterning process, so that problems such as formation of an organic EL array may not occur.

Hereinafter, a method of manufacturing an organic light emitting display device according to the present invention will be described with reference to FIGS. 8A to 8F.

First, a transparent conductive material is deposited on a mother substrate 103 formed using soda lime or hardened glass, and then patterned by a photolithography process and an etching process to form an anode electrode 104 as shown in FIG. 8A. ) And a transparent material pattern 150 is formed in the outer region of the mother substrate 103. Herein, indium tin oxide or SnO ₂ may be used as the transparent conductive material.

On the mother substrate 103 on which the anode electrode 104 and the transparent material pattern 150 are formed, as shown in FIGS. 8B and 9 (perspective view), the photosensitive insulating material 106a is subjected to spin-coating. By the front is formed. More specifically, the end of the photosensitive insulating material 106a is formed to extend on the transparent material pattern 150.

Here, since the transparent material pattern 150 is positioned between the mother substrate 103 and the photosensitive insulating material 106a in the outer region of the mother substrate 103, the peeling phenomenon of the photosensitive insulating material 106a does not occur. That is, a transparent material pattern 150 having good adhesion to each of the mother substrate 103 and the photosensitive insulating material 106a is positioned between the mother substrate 103 and the photosensitive insulating material 106a, so that the mother substrate 103 and the photosensitive material are exposed to each other. Repulsive forces due to differences in interfacial energy and material properties between the insulating materials 106a are alleviated. Accordingly, the peeling phenomenon such as the photosensitive insulating material 106a is partially separated on the mother substrate 103 does not occur.

Thereafter, the photosensitive insulating material 106a is patterned by a photolithography process, so that the insulating layer 106 is formed to expose the light emitting region 165 as shown in FIG. 8C (cross-sectional view).

After the photosensitive organic material is deposited on the insulating layer 106 and patterned by a photolithography process, the partition 108 is formed as shown in FIG. 8D. The partition 108 is formed in the non-light emitting area so as to intersect the plurality of anode electrodes 104 to distinguish the pixels.

As shown in FIG. 8E, the organic light emitting layer 110 is formed on the mother substrate 103 on which the partition 108 is formed by thermal deposition, vacuum deposition, or the like using a common mark and a shadow mask (not shown). Is formed.

As the metal material is deposited on the substrate 103 on which the organic light emitting layer 110 is formed, the cathode electrode 112 is formed as shown in FIG. 8F.

Subsequently, an encapsulation process is performed to bond the mother substrate 103 and the cap 128 on which the organic EL array 115 including the cathode electrode 112 and the like are bonded through a sealant such as an epoxy resin. Ice process is carried out. As a result, a plurality of organic EL display elements are completed.

As described above, in the mother substrate and the method of manufacturing the organic light emitting display device using the same according to the present invention, an anode electrode is formed on the mother substrate and a transparent material pattern is formed in the outer region of the mother substrate. Since the transparent material pattern is positioned between the insulating material and the mother substrate, peeling due to differences in interfacial energy and material properties between the insulating material and the mother substrate is prevented. As a result, significant errors, deviations, and the like are reduced in the patterning process, thereby causing problems such as poor formation of the organic EL array.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (5)

In a mother substrate on which an organic electroluminescent array is formed, And a transparent material pattern positioned in an outer region of the mother substrate and formed in a band shape to surround the organic light emitting array. The method of claim 1, The organic light emitting array includes first and second electrodes formed to cross each other with an organic light emitting layer interposed therebetween, The transparent substrate is a mother substrate, characterized in that the same material as any one of the first and second electrodes. Forming a first electrode on the mother substrate and forming a transparent material pattern positioned in an outer region of the mother substrate in a band shape and surrounding the first electrodes; Forming an insulating material on the first electrode and the transparent material pattern; Patterning the insulating material to partially expose the first electrode to form an insulating film defining a light emitting area; Forming a partition on the insulating film; Forming an organic light emitting layer on the exposed light emitting region; Forming a second electrode intersecting the first electrode; Packaging a mother substrate on which the second electrode is formed by an encapsulation process; A method of manufacturing an organic light emitting display device, the method comprising: cutting the packaged mother substrate by a scribing process. The method of claim 3, wherein And a portion of the insulating material is formed to cover the transparent material pattern. The method of claim 4, wherein An end of the insulating material is formed on the transparent material pattern manufacturing method of an organic light emitting display device.

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