KR100629176B1 - Organic Electro Luminescence Display Device And Fabricating Method Thereof - Google Patents

Abstract

The present invention relates to an organic electroluminescent display device having a glass cap, which can easily discharge static electricity, and a method of manufacturing the same.

An organic electroluminescent display device according to the present invention comprises: a substrate on which an organic electroluminescent array is formed; A glass cap bonded to the substrate through a sealant; And at least one metal pattern positioned between the glass cap and the sealant.

Description

Organic electroluminescent display device and manufacturing method thereof {Organic Electro Luminescence Display Device And Fabricating Method Thereof}             

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 schematic view of an organic electroluminescent display device having a glass cap.

FIG. 4 is a view showing an organic electroluminescent display device according to the present invention, and FIG. 5 is a view showing a shape of the outside of the organic electroluminescent display device shown in FIG.

6A to 6D illustrate a method of manufacturing an organic light emitting display device according to the present invention.

     <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 cap

25,125: Sealant 35, 135: Glass cap

145 glass panel 140 metal pattern

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display device, and more particularly, to an organic electroluminescent display device using a glass cap, and an organic electroluminescent display device capable of easily discharging static electricity and a method of manufacturing 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.

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 is 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, the electrons and holes are paired up and extinguished. The advantage is that it is possible. 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. In order to solve this problem, an encapsulation process is performed 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, moisture and the like.

The cap 28 is provided with a getter 22 positioned on a surface facing the organic EL array 15 to absorb moisture and oxygen, and a semipermeable membrane for fixing the getter 22. Here, the getter 22 is made of inorganic oxides, that is, calcium oxide (Cao) and barium oxide (BaO), which react with moisture to form hydroxyl groups (OH), and the semi-permeable membrane is made of Teflon, poly Materials such as esters and paper 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 10b, 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.

3 is a view showing an organic EL display device using a conventional glass cap.

The glass cap 35 shown in FIG. 3 is simpler to manufacture than the metal cap in general, and has an advantage in forming a large device. The organic EL display element using the glass cap 35 has the same structure as the organic EL display element shown in FIG. 1 except that the glass cap 35 is used instead of the conventional metal cap 28.

The glass cap 135 has a problem in that static electricity generated inside the device is not easily discharged unlike the cap 28 made of a conventional metal. That is, since the glass cap 135 is an insulator that does not have conductivity, problems such as damage to the EL cell may occur because fine static electricity generated by device driving or the like is not discharged to the outside.

Accordingly, an object of the present invention is to provide an organic electroluminescent display device having a glass cap, which can easily discharge static electricity, and a method of manufacturing the same.

In order to achieve the above object, the organic electroluminescent display device according to the present invention comprises a substrate formed with an organic electroluminescent array; A glass cap bonded to the substrate through a sealant; And at least one metal pattern positioned between the glass cap and the sealant.

The glass cap may include a vertical portion vertically bonded to the substrate; It is connected to the vertical portion and includes a horizontal portion parallel to the substrate, the length of the metal pattern is characterized in that the same as the line width of the vertical portion.

The metal pattern is formed in a line shape, the length of which is longer than the width of the sealant.

A method of manufacturing an organic electroluminescent display device according to the present invention includes the steps of forming a plurality of organic electroluminescent arrays on a substrate at predetermined intervals; Providing a glass mold having a groove corresponding to each of the organic light emitting arrays; Forming at least one metal pattern in an area excluding the groove of the glass mold; Bonding the substrate and the glass mold using a sealant; And performing a scribing process based on the scribing line set on the bonded glass mold and the substrate.

The metal pattern is formed in a line shape and is formed to have a length longer than the width of the sealant.

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. 4 to 6D.

4 is a cross-sectional view schematically showing an organic EL display device according to an embodiment of the present invention, and FIG. 5 is a view showing the outside of the organic EL display device viewed from the X direction in FIG.

The organic EL display device shown in FIGS. 5 and 6 has a first electrode (or anode) 104 and a second electrode (or cathode) formed on the substrate 102 to cross each other with the organic light emitting layer 110 therebetween. An organic EL array 115 including an electrode) 112, a glass cap 135 bonded to the substrate 102 on which the organic EL array 115 is formed, and the sealant 125, and a glass cap 135. And at least one metal pattern 140 positioned between the sealant 125 and the sealant 125.

A plurality of anode electrodes 104 of the organic EL array 115 are formed on the substrate 102 at predetermined intervals. On the substrate 102 on which the anode electrode 104 is formed, an insulating film 106 having an opening for each EL cell EL region is formed. On the insulating layer 106, a partition wall 108 for separating the organic light emitting layer 110 and the cathode electrode 112 to be formed thereon is positioned. The partition 108 is formed in a direction crossing the anode electrode 104 and has an inverted 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 and a hole injection layer.

The glass cap 135 includes a vertical portion 135a connected to the substrate 102 and the sealant 125 and a horizontal portion 135b connected to the vertical portion 135a and parallel to the substrate 102. In the unit 135b, a getter 122 for absorbing moisture and oxygen of the organic EL array 115 is located.

The metal pattern 140 is formed in a line shape, and the length d1 is the same as the line width d2 of the vertical portion 135a of the glass cap 135 and is formed longer than the line width d3 of the sealant 125. .

As shown in FIG. 5, the metal pattern 140 may expose one end surface to the outside of the device. Accordingly, free electrons due to static electricity generated when the device is driven can be easily escaped to the outside using the metal pattern 140 as a conductive medium. Thereby, the defect of the element by static electricity etc. can be prevented. Here, as the metal pattern 140, a conductive metal such as chromium (Cr), molybdenum (Mo), aluminum (Al), or the like may be used.

As such, the organic EL display device according to the present invention includes a glass cap 135, and at least one metal pattern 140 is formed between the glass cap 135 and the sealant 125. Accordingly, the static electricity generated inside the device can be easily discharged to the outside of the device.

6A to 6D are views for explaining an organic EL display element and a method of manufacturing the same according to the present invention.

First, a plurality of organic EL arrays 115 are formed on the substrate 102. The organic EL array 115 includes first and second electrodes 104 and 112 formed to cross each other with the organic light emitting layer 110 interposed therebetween, and a partition wall 108 for electrically separating the second electrode 112. .

Thereafter, a large glass 145 capable of forming a plurality of glass caps 135 is prepared, and an organic EL array is formed as shown in FIG. 6A by using a patterning process such as sand blasting, a photolithography process, and an etching process. A glass (hereinafter referred to as "glass mold 145") having a groove 155 capable of packaging 115 is formed.

Subsequently, the conductive metal material is deposited on the glass mold 145 using a deposition method such as PECVD or sputtering, and then patterned by a photolithography process and an etching process to form the grooves 155 as shown in FIG. 6B. At least one metal pattern 140 is formed in the excluded region. Here, the metal pattern 140 is formed in a line shape, and as the conductive metal material, chromium (Cr), molybdenum (Mo), aluminum (Al), or the like is used.

Thereafter, as shown in FIG. 6C, the glass mold 145 on which the metal pattern 140 is formed is aligned on the substrate 102 on which the organic EL array 115 is formed, and then, as illustrated in FIG. 6D, the glass mold ( The organic EL array 115 is packaged by bonding the substrate 102 on which the 145 and the organic EL array 115 are formed through the sealant 125.

Subsequently, the scribing process is performed based on the scribing line 152, so that the glass mold 145 becomes a plurality of glass caps 135 and at the same time the organic EL display device using the glass cap 135 of FIG. Is formed.

As described above, in the organic EL display device and the method of manufacturing the same according to the present invention, at least one metal pattern is formed between the glass cap and the sealant. This metal pattern serves to discharge the static electricity generated when driving the device to the outside. Thereby, the defect of the element by static electricity etc. can be prevented.

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 (7)

A substrate on which an organic electroluminescent array is formed; A glass cap bonded to the substrate through a sealant; And at least one metal pattern positioned between the glass cap and the sealant. The method of claim 1, The glass cap may include a vertical portion vertically bonded to the substrate; It is connected to the vertical portion and includes a horizontal portion parallel to the substrate, And the length of the metal pattern is equal to the line width of the vertical portion. The method of claim 1, The metal pattern is an organic electroluminescent display device, characterized in that formed in the form of a line. Forming a plurality of organic electroluminescent arrays on the substrate at predetermined intervals; Providing a glass mold having a groove corresponding to each of the organic light emitting arrays; Forming at least one metal pattern in an area excluding the groove of the glass mold; Bonding the substrate and the glass mold using a sealant; And performing a scribing process on the basis of the scribing lines set on the bonded glass mold and the substrate. The method of claim 4, wherein The metal pattern is a method of manufacturing an organic light emitting display device, characterized in that formed in the form of a line. The method of claim 5, And the metal pattern is formed to have a length longer than the width of the sealant. The method of claim 3, wherein And a length of the metal pattern is longer than a width of the sealant.

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