KR100705320B1 - Organic Electro Luminescence Display Device And Fabricating Method Thereof - Google Patents

Abstract

The present invention relates to an organic electroluminescent display device capable of preventing scribing failure.

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, wherein the glass cap includes at least one groove positioned in a bonding region with the substrate, and the groove is in the bonding region with the substrate. Located in an area far from the array.

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.

4A and 4B are views for explaining an encapsulation process using a glass cap.

5 is a view showing an organic light emitting display device having a glass cap according to the present invention.

6 is a flowchart illustrating a method of manufacturing an organic light emitting display device according to the present invention, and FIGS. 7A and 7B are diagrams for describing the flowchart of FIG. 6 in detail.

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

2,102: substrate 4,104: anode electrode

8,108 bulkhead 107 dummy insulation pattern

10,110: organic light emitting layer 12,112: cathode electrode

28,: Cap 25,125: Sealant

35, 128: glass cap 45145: glass panel

155: home

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 preventing defective scribing process 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, 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. 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 and moisture.

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 24 for fixing the getter 22. do. Here, the getter 22 may be formed of inorganic oxide, that is, calcium oxide (Cao), barium oxide (BaO), or the like, which reacts with water to form hydroxyl groups (OH). Teflon, polyester, paper or the like is used to lift.

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.

4A and 4B illustrate an encapsulation process using the glass cap 35 shown in FIG. 3.

First, a large glass for forming a plurality of glass caps may be prepared, and the organic EL array 15 may be packaged as shown in FIG. 4A by using a patterning process such as sand blasting, photolithography, and etching. A glass having a space provided therein (hereinafter, a glass provided with a space capable of packaging the organic EL array 15 is referred to as a "glass mold") 45 is formed. Subsequently, as shown in FIG. 4B, the substrate on which the glass mold 45 and the organic EL array 15 are formed is bonded through the sealant 25, so that the organic EL array 15 is packaged by the glass mold 45. Thereafter, a scribing process of cutting the scribing line 52 to form a plurality of organic EL display elements is performed.

Meanwhile, in the encapsulation process using the conventional glass mold 45, as shown in FIG. 4B, the sealant 25 is positioned up to the scribing line 52 of the glass mold 45. Bad scribing problems, such as not being cut exactly as designed.

Accordingly, an object of the present invention is to provide an organic electroluminescent display device and a method of manufacturing the same, which can prevent defective scribing process in an organic electroluminescent display device using a glass cap.

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, wherein the glass cap includes at least one groove positioned in a bonding region with the substrate, and the groove is in the bonding region with the substrate. And located in an area far from the array.
A portion of the sealant may be moved to the groove when the substrate and the glass cap are bonded to each other.
A method of manufacturing an organic light emitting display device according to the present invention includes forming a plurality of organic electroluminescent arrays on a substrate at predetermined intervals; Packaging the organic electroluminescent array and providing a glass mold having at least one groove located in a region distant from the organic electroluminescent array in a bonding region with a substrate; Bonding the substrate and the glass mold using a sealant; And performing a scribing process based on the scribing lines set on the bonded glass mold and the substrate.
Bonding the substrate and the glass mold using the sealant; And a portion of the sealant is filled into the groove when the substrate and the glass mold are bonded to each other.
The glass mold is separated into a plurality of glass caps by the scribing process, and each glass cap further comprises encapsulating one organic electroluminescent array.

delete

delete

delete

delete

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 7B.

5 is a sectional view schematically showing an organic EL display element according to an embodiment of the present invention.

In the organic EL display device illustrated in FIG. 5, 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 interposed therebetween ( 112 and an organic EL array 115 including a glass cap 128 bonded to the substrate 102 on which the organic EL array 115 is formed and the sealant 125 including the fluorescent material.

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 128 is provided with a getter 122 positioned on the surface facing the organic EL array 115 to absorb moisture and oxygen.

In addition, at least one groove 155 is provided in a region where the glass cap 128 and the substrate 102 are bonded to the sealant 125. More precisely, the glass cap 128 is formed in the outer region in the region to be bonded to the substrate 102 (hereinafter referred to as the "sealine region P1").

The groove 152 formed in the glass cap 120 serves to prevent a part of the sealant 125 having fluidity during the encapsulation process from leaving the seal line region P1. That is, when a part of the sealant 125 moves to the outer region of the seal line region P1, the sealant 125 is filled in the groove 152 provided in the glass cap 128, so that the sealant 125 is positioned on the stripe line 152. You will not. Thus, defective scribing process is prevented.

As such, the organic electroluminescent display device according to the present invention includes a glass cap 128, and the glass cap 128 moves outward in the junction region (or the seal line region P1) with the substrate 102. At least one groove 155 is provided. Accordingly, even when a part of the sealant 125 leaves the seal line region P1 during the encapsulation process, the sealant 125 is confined in the at least one groove 155 formed in the glass cap 128, thereby scribing the sealant 125. Movement to line 152 may be prevented. As a result, scribing failures do not occur, such as the scribing process is correctly performed as designed.

6, 7A and 7B are views for explaining a method of manufacturing an organic light emitting display device according to the present invention.

First, a plurality of organic EL arrays 115 are formed on the substrate 102. (S2) The organic EL array 115 has first and second electrodes formed to cross each other with the organic light emitting layer 110 therebetween. (104, 112), a partition 108 for electrically separating the second electrode 112 is included.

Thereafter, a large glass capable of forming a plurality of glass caps may be prepared, and the organic EL array 115 may be packaged as shown in FIG. 6A by using a patterning process such as sand blasting, photolithography, and etching. At least one groove may be formed in the outer region in the region corresponding to the seal line region P1 during the encapsulation process. 155 is formed (S4).

Thereafter, as shown in FIG. 6B, the glass mold 145 and the substrate 102 on which the organic EL array 115 is formed are bonded through the sealant 125 to package the organic EL array 115 (S6). When the sealant 125 is discharged too much, the sealant 125 is trapped in the groove 155 provided in the glass mold 145 even though some of the sealant 125 moves outward of the seal line region P1. Positioning on the scribing line 152 is prevented.

Subsequently, the scribing process is performed to form the glass mold 145 with the plurality of glass caps 128, and to form the organic EL display device using the glass caps 128 (S8).

As described above, the organic EL display device and the method of manufacturing the same according to the present invention are formed in the glass cap and at least one groove is formed in the outer region in the bonding region between the glass cap and the substrate. Accordingly, even when a part of the sealant leaves the seal line during the encapsulation process, the sealant is confined in at least one groove formed in the glass cap, thereby preventing the sealant from moving to the scribing area. As a result, scribing failures do not occur, such as the scribing process is correctly performed as designed.

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 (6)

A substrate on which an organic electroluminescent array is formed; And a glass cap bonded through the substrate and the sealant, The glass cap At least one groove located in a bonding area with the substrate, And the groove is located in a region far from the organic electroluminescent array in a junction region with the substrate. delete The method of claim 1, And a part of the sealant is movable to the groove when the substrate and the glass cap are bonded to each other. Forming a plurality of organic electroluminescent arrays on the substrate at predetermined intervals; Packaging the organic electroluminescent array and providing a glass mold having at least one groove located in a region distant from the organic electroluminescent array in a bonding region with a substrate; 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 Bonding the substrate and the glass mold using the sealant; And a portion of the sealant is filled into the groove when the substrate and the glass mold are bonded to each other. The method of claim 4, wherein The glass mold is separated into a plurality of glass caps by the scribing process, and each glass cap further comprises encapsulating one organic electroluminescent array. Way.

Images