KR100606417B1 - Apparatus for fabricating organic electro luminescence display device - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing an organic electroluminescent display device capable of preventing a sealing defect due to a misalignment of a cap and a substrate used in an encapsulation process.

The present invention

Description

Apparatus for manufacturing organic electroluminescent display device {APPARATUS FOR FABRICATING ORGANIC ELECTRO LUMINESCENCE DISPLAY DEVICE}             

1 is a cross-sectional view of a conventional organic electroluminescent display device.

2 is a view for explaining a bonding process of a substrate and a cap on which an organic electroluminescent display device is formed in a vacuum chamber.

3 is a view showing a conventional apparatus for manufacturing an organic electroluminescent display device.

4A is a view for explaining an apparatus for manufacturing an organic electroluminescent display device according to an exemplary embodiment of the present invention.

4B is a view illustrating any one pusher of the apparatus for manufacturing the organic electroluminescent display device.

4C is a cross-sectional view taken along the line A-A of FIG. 4B.

5A and 5B are views for explaining the operation of the manufacturing apparatus of the organic electroluminescent display device shown in FIGS. 4A to 4C.

6 is a flowchart illustrating a method of manufacturing an organic electroluminescent display device according to the present invention.

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

1, 201: substrate 15,215: organic light emitting device

9, 209: Cap 10,210: Sealant

24,224: mask 26,226: mask holder

18,218: Cap tray 20, 100: Pushing device

110: pusher 120: pusher support

130: LM Guide

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display device, and more particularly, to an apparatus for manufacturing an organic electroluminescent display device, which can prevent an encapsulation defect due to a misalignment of a cap and a substrate used in an encapsulation process.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (hereinafter referred to as "LCDs"), field emission displays (FEDs), plasma display panels (hereinafter referred to as PDPs), and organic electric fields. There are light emitting (Electro-luminescence) display elements, etc. Researches are being actively conducted to improve the display quality of such a flat panel display device and to attempt to make a large screen.

Among them, PDP is attracting attention as a display device which is light and small and is most advantageous for large screen because of its simple structure and manufacturing process. However, PDP has low luminous efficiency, low luminance and high power consumption. On the other hand, an active matrix LCD having a thin film transistor (TFT) as a switching element has a disadvantage in that it is difficult to make a large screen due to the semiconductor process and consumes a lot of power due to the backlight unit. , Optical prism sheet, diffusion plate, etc. are characterized by high optical loss and narrow viewing angle.

In contrast, the EL display device is classified into an inorganic EL display device and an organic EL display device according to the material of the light emitting layer. The EL display device is a self-luminous device that emits light by itself. Inorganic EL display elements have higher power consumption than the organic EL display elements, cannot obtain high luminance, and cannot emit various colors of R, G, and B. On the other hand, the organic EL display device is driven at a low DC voltage of several tens of volts, has a high response speed, can obtain high luminance, and can emit various colors of R, G, and B, which is suitable for next-generation flat panel display devices.

1 is a cross-sectional view showing a conventional organic EL display element.

The organic EL display device shown in FIG. 1 includes an anode electrode 2 formed on the substrate 1, an insulating film 3 formed on the substrate 1 on which the anode electrode 2 is formed, a hole related layer 4, and a light emitting layer. ((Emitting Layer: EMI) 5, the electron-related layer 6 is laminated. The cathode electrode 7 is formed on the electron-related layer 6 as a metal electrode.

The anode electrode 2 and the insulating film 3 have a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin zinc oxide (ITZO) on the substrate 1 on the substrate 1. It is formed by patterning after deposition. In the hole related layer 4, a hole injection layer (HIL) and a water transport layer (HTL) are sequentially formed on the anode electrode 2. The light emitting layer 5 functions to emit light, but mostly also serves to transport electrons or holes. In the electron related layer 6, an electron transport layer (ETL) and an electron injection layer (EIL) are sequentially stacked on the light emitting layer 5.

The hole related layer 4, the light emitting layer 5, and the electron related layer 6 are formed by vacuum deposition in the case of a low molecular weight compound, and are formed by spin coating or inkjet printing in the case of a polymer compound. .

The cathode 7 may be made of Al, Ag, etc. having high reflectance, but in many cases, a metal such as aluminum (Al) is used.

In the organic EL display device, when a driving voltage and a current are applied to the anode electrode 2 and the cathode electrode 7, the holes in the hole injection layer and the electrons in the electron injection layer proceed toward the light emitting layer 5, respectively. The fluorescent material is excited. In this way, the visible light generated from the light emitting layer 5 displays an image or an image on the principle that the light exits through the transparent anode electrode 2.

On the other hand, the organic EL display element 15 has a property of being easily deteriorated by moisture and oxygen. In order to solve this problem, an encapsulation process is carried out, so that the substrate 1 and the cap 9 on which the organic EL display elements 15 such as the anode electrode 2 are formed are sealed through a sealant 10 such as an epoxy resin. Are cemented. The cap 9 is filled with a getter (Getter: 8) for absorbing moisture and oxygen in the center of the rear surface thereof, and the semipermeable membrane 11 is attached to fix the getter 8 and to enter the moisture and oxygen. do.

2 is a view for explaining a process of bonding a substrate and a cap on which an organic EL display element is formed in a vacuum chamber.

Referring to FIG. 2, a cap tray having a cap 9 having a sealant 10 coated thereon is seated under a substrate 1 on which a plurality of organic EL display elements 15 are formed. 18 is positioned, and a pushing device 20 for pushing the cap 9 is positioned below the cap tray 18 so that the cap 9 may be in close contact with the substrate 1. At this time, the pushing device 20 is provided with a spring unit 20a to push the cap 9 so that the pressure acting on the cap 9 gradually increases.

A curing mask 24 having a shield 22 formed on the substrate 1 to correspond to the organic EL display element 15 formed on the substrate 1 as shown in FIG. 3. Is fixed and positioned by the mask holder 26. The shield 22 of the curing mask 24 prevents the organic EL display device 15 from being exposed to ultraviolet rays (UV) irradiated to the substrate 1 when the substrate 1 and the cap 9 are bonded to each other. As a result, the organic EL display device 15 serves to prevent damage to organic materials and the like.

After the mask 24 and the cap tray 18 are positioned above and below the substrate 1, the mask 24 and the substrate 1 are aligned and adhered to each other, and the cap 9 is pressed by the pushing device 20. As a result, the cap 9 is bonded to the substrate 1 through the sealant 10. At this time, the sealant 10 is cured by ultraviolet rays (UV) transmitted through a predetermined region of the mask 24, so that the cap 9 and the substrate 1 are firmly bonded.

Thereafter, the pushing device 20 and the cap tray 18 are lowered to separate the mask 24 and the substrate 1, thereby forming an organic EL display element in which the cap 9 is bonded.

On the other hand, if the cap 9 and the substrate 1 are continuously encapsulated using the pushing device 20, a defect may occur in the spring unit 20a of the pushing device 20. . At this time, alignment defects of the cap 9 and the substrate 1 may occur due to the spring unit 20a of the pushing device 20, and thus, the sealing defect of the organic EL display element may occur. This happens.

Accordingly, an object of the present invention is to provide an apparatus for manufacturing an organic EL display element, which can prevent a sealing defect due to a misalignment of a cap and a substrate used in an encapsulation process.

In the manufacturing apparatus of the organic electroluminescent display device for bonding the cap and the substrate using a sealant for encapsulation of the organic electroluminescent display device according to an embodiment of the present invention, in order to achieve the above object, the cap is supported A pusher, a pusher support for supporting the pusher, and a cap pushing device having an LM guide mounted on the pusher support to guide the up and down movement of the pusher.

The LM guide has a guide groove and a guide protrusion.

The apparatus for manufacturing the organic electroluminescent display device further restricts the upward movement of the pusher, and further includes a pusher movement limiter disposed above the LM guide.

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

4A is a view for explaining an apparatus for manufacturing an organic EL display device according to an exemplary embodiment of the present invention. FIG. 4B is a view showing one pusher of the apparatus for manufacturing an organic EL display element. FIG. 4C is a view of FIG. 4B. A cross section taken along the AA line.

4A to 4C, an apparatus for manufacturing an organic EL display device according to an exemplary embodiment of the present invention has a structure including a pushing device 100.

The pushing device 100 includes a pusher 110 for supporting a cap for encapsulating a substrate on which an organic EL display element is formed in the encapsulation process, a pusher support 120 for supporting the pusher 110, and a pusher support 120. It has a LM guide 130 to be connected.

The pusher 110 supports the cap for encapsulating the substrate on which the organic EL display element is formed and applies a predetermined pressure to the cap so that the cap is bonded to the substrate on which the organic EL display element is formed.

The pusher support part 120 supports the pusher 110, serves to transfer pressure due to the movement of the LM guide 130 to the pusher 110, and is connected to the LM guide 130.

The LM guide 130 includes a guide protrusion 131 and a guide groove 135, and any one of the guide protrusion 131 and the guide groove 135 is connected to the pusher support 120.

In addition, the upper end of the LM guide 130 restricts the movement of the pusher 110, and is provided with a pusher movement limiting unit 137 having a predetermined protrusion.

The pusher movement limiter 137 is installed at the upper end of the guide groove 135.

5A and 5B are views for explaining the operation of the manufacturing apparatus of the organic EL display element shown in Figs. 4A to 4C.

5A and 5B, the operation of the manufacturing apparatus of the organic EL display device according to the exemplary embodiment of the present invention will be described.

First, the mask 224 and the cap tray 218 are positioned above and below the substrate 201 on which the organic EL display element 215 is formed. Then, the pusher 110 of the pushing device 100 is aligned to correspond to the cap 209 of the cap tray 218.

At this time, when the pusher 110 of the pushing device 100 is raised by using the up / down movement of the guide protrusion 131 and the guide groove 135 of the LM guide 130 of the pushing device 100, the substrate 201 ), The substrate 201 and the mask 224 are in close contact with each other.

Then, when UV is irradiated using the mask 224, the sealant 210 between the substrate 201 and the cap 209 is cured to encapsulate the organic EL display element 215.

Then, when the pusher 110 is lowered using the LM guide 130, the mask 224 and the cap tray 218 are separated from the substrate 201 on which the organic electroluminescent element 215 is formed.

Here, the substrate 201 in which the pusher movement limiting portion 137 is provided on the LM guide 130 of the pushing device 100 and the pusher 110 is excessively raised to form the organic EL display element 215. Excessive pressure can be prevented.

As described above, in the apparatus for manufacturing the organic EL display device according to the present invention, the encapsulation process of the organic EL display device 215 is performed by using the pushing device 100 having the LM guide 130 to repeatedly encapsulate the encapsulation. Even if the migration process is performed, misalignment of the pusher 110 and the cap 209 of the pushing device 100 may be prevented. This is because the LM guide 130 is composed of the guide protrusion 131 and the guide groove 135 so that the pusher 110 can always be constantly moved up and down.

6 is a flowchart showing a method of manufacturing an organic EL display device according to the present invention.

First, an organic EL display element 215 such as an anode electrode is formed on the substrate 101. (S2) Then, to perform an encapsulation process for protecting the organic EL display element 215 from moisture, oxygen, and the like. The pushing device 100 illustrated in FIG. 4 is aligned on the upper portion of the substrate 201, and the cap tray 218 is aligned on the lower portion of the substrate 201. (S4) The organic EL display device is disposed on the cap tray 218. A cap 209 for packaging 215 is held, and a sealant 210 is applied to an area where each cap 209 and the substrate 201 are to be contacted.

Subsequently, by aligning the mask 224, the substrate 201 and the cap 209, the substrate 201 and the mask 224, the substrate 201 and the cap 209 are brought into close contact with each other (S6), and the pushing device ( 100 presses the cap 209 by raising the pusher 110 by using the LM guide 130, and ultraviolet rays penetrate the area excluding the shield 222 of the mask 124. The sealant 210 for bonding the 209 and the substrate 201 is cured. (S8) Thus, the organic electroluminescence display 215 is attached to the cap 209 by bonding the substrate 201 and the cap 209. Packaged by

Thereafter, the pushing device 100 lowers the pusher 110 through the LM guide 130 so that the pressure of the pushing device 100 is removed, so that the mask 224 and the cap tray 218 are removed from the substrate 201. It is separated. (S10)

As described above, in the organic EL display device manufacturing apparatus using the pushing device 100 according to the present invention, the pusher 110 is raised using the LM guide 130 of the pushing device 100 to press the cap 209. While performing the encapsulation process while applying, and also to push the pusher 110 using the LM guide 130. Accordingly, since the up and down movement of the pusher 110 is always constant through the LM guide 130, misalignment of the pusher 110 and the cap 209 can be prevented.

In addition, the LM guide 130 is provided with a pusher movement limiting portion 137 that can prevent the excessive rise of the pusher 110, thereby excessively acting on the cap 209 due to the excessive rise of the pusher 110. Can be prevented.

As described above, the manufacturing apparatus of the organic EL display device according to the present invention can prevent the sealing failure due to the alignment of the cap and the substrate used in the encapsulation process. In addition, by providing a pusher movement limiting portion, it is possible to prevent an excessive pressure on the cap due to excessive rise of the pusher.

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 (3)

In the manufacturing apparatus of the organic electroluminescent display device for bonding the cap and the substrate using a sealant for encapsulation of the organic electroluminescent display device, An organic electroluminescence display comprising a pusher for supporting the cap, a pusher support for supporting the pusher, and a cap pushing device mounted to the pusher support and having an LM guide for inducing upward and downward movement of the pusher; Device manufacturing apparatus. The method of claim 1, And the LM guide includes a guide groove and a guide protrusion. The method of claim 1, And limiting the upward movement of the pusher and further including a pusher movement limiter disposed above the LM guide.

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