KR20060115537A - Apparatus and method for fabricating flat display divice - Google Patents

Abstract

An apparatus and a method for fabricating a flat display device are provided to spraying hot water to a substrate and recover a warping state of the substrate by using a hot water spring cooler. An apparatus for fabricating a flat display device includes a substrate(51), a scribing table(70), and a hot water supply unit(78). A plurality of display elements(65) are formed on the substrate. The substrate is loaded on the scribing table. The scribing table is used for performing a separation process of the display elements. The hot water supply unit is installed apart from the scribing table above the scribing table in order to supply heat to the substrate which is loaded on the scribing table.

Description

Manufacturing apparatus and method of manufacturing a flat panel display device {APPARATUS AND METHOD FOR FABRICATING FLAT DISPLAY DIVICE}

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

FIG. 2 is a schematic view illustrating bonding of a cap and a substrate on which a conventional organic electroluminescent array is formed. FIG.

3 is a view schematically showing a scribing table on which a substrate of a conventional curved organic electroluminescent display device is mounted.

4 is a cross-sectional view schematically illustrating an apparatus for manufacturing an organic electroluminescent display device according to an exemplary embodiment of the present invention.

Figure 5 is a cross-sectional view for explaining the principle of spreading the curved substrate seated on the scribing table of the present invention.

<Brief description of symbols for the main parts of the drawings>

1, 51: substrate 2: anode electrode

3: insulating film 4: hole related layer

5: light emitting layer 6: electron related layer

7 cathode electrode 8 getter

9, 59: cap 10, 60: sealant

11: semi-permeable membrane 15, 65: organic electroluminescent array

18: Cap tray 19: Pushing device

20: scribing table 22: shield

24: Curing Mask 26: Mask Holder

78: hot water supply sprinkler

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device, and more particularly, to an apparatus and a manufacturing method of a flat panel display device capable of improving yield.

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. Electro-luminescence (hereinafter, referred to as "EL") display element.

Among them, PDP is attracting attention as a display device which is light and simple because of its simple structure and manufacturing process, but is most advantageous for large screens. 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 (hereinafter referred to as a TFT) as a switching element has a disadvantage in that it is difficult to 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. In comparison with the organic EL display device, the inorganic EL display device has higher power consumption and cannot obtain high luminance, and cannot emit various colors of R (Red), G (Green), and B (Blue). On the other hand, the organic EL display device is driven at a low DC voltage of several tens of volts, has a fast response speed, obtains high luminance, and emits various colors of R, G, and B, which is suitable for next-generation flat panel display devices. .

1 is a view schematically showing a conventional organic EL display element.

Referring to FIG. 1, a conventional organic EL display device includes an anode electrode 2 formed on a substrate 1, an insulating film 3 formed on a substrate 1 on which an anode electrode 2 is formed, and a hole related layer 4. An emission layer (EMI) 5 and an electron related layer 6 are stacked. On the electron-related layer 6, a cathode electrode 7 is formed as a metal electrode.

The anode electrode 2 and the insulating film 3 are sequentially formed by applying a transparent electrode material and an insulating material on the substrate 1 and then by photolithgraphy. In the hole related layer 4, a hole injection layer (HIL) and a hole 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 electrode 7 is formed on the electron related layer 6. 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, the encapsulation process or the 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 with an epoxy resin. Is cemented through (10). The cap 9 is filled with a getter (Getter 8) for absorbing moisture and oxygen in the central portion of the back thereof, and the semipermeable membrane 11 is attached to fix the getter 8 and to enter the moisture and oxygen. do.

Fig. 2 is a view schematically showing the bonding between a cap and a substrate on which a conventional organic EL array is formed.

Referring to FIG. 2, a cap tray 18 on which a cap 9 having a sealant 10 coated thereon is seated under a substrate 1 on which a plurality of organic EL arrays 15 are formed. ) Is positioned, and a pushing device 19 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.

A curing mask 24 having a shield 22 formed on the substrate 1 to correspond to the organic EL array 15 formed on the substrate 1 is fixed by the mask holder 26. To be located. The shield 22 of the mask 24 prevents the organic EL array 15 from being exposed to ultraviolet rays (UV) irradiated to the substrate 1 when the substrate 1 and the cap 9 are bonded together, thereby preventing the organic EL array 15 from being exposed. ) To prevent damage to organic materials.

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 19. 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 (UV) light transmitted through a predetermined region of the mask 24, so that the cap 9 and the substrate 1 are bonded to each other.

Thereafter, the organic EL display device is completed by scribing a plurality of organic EL arrays 15 formed on the substrate 1 bonded to the cap 9 through a scribing process.

In the scribing of the organic EL display element, a substrate 1 on which a plurality of organic EL display elements 16 having been encapsulated is formed is seated on the scribing table 20 and a scribing wheel (not shown). This is performed by scribing the organic EL display element 16 to be separated by forming cracks of a predetermined depth on the substrate 1.

However, such a substrate 1 exhibits a phenomenon in which its outer portion is bent by heat from ultraviolet rays which is irradiated during curing of the sealant 10 in the encapsulation process. Accordingly, the substrate 1 seated on the scribing table 20 is seated on the sieve scribing table 20 whose outer portion is bent as shown in FIG.

The substrate 1 on which the plurality of organic EL display elements 16 are formed is not properly seated on the scribing table 20 because the substrate 1 is seated on the scribing table 20 with its outer portion bent. The scribing of the display device is performed without the outer portion of the substrate 2 aligned correctly.

If the outer portion is scribed to the substrate 2 which is not aligned correctly, the organic EL display elements 16 formed at the outer portion of the substrate 2 are not scribed correctly, and thus an incorrect scribing is performed. By scribing, the organic EL display element 16 is determined to be defective.

As described above, when the organic EL display element 16 is judged to be defective due to incorrect scribing, the manufacturing of the organic EL display element has a problem that the yield is reduced.

Accordingly, an object of the present invention is to provide an apparatus and method for manufacturing a flat panel display device which can improve yield through accurate scribing.

In order to achieve the above object, an apparatus for manufacturing a flat panel display device according to an embodiment of the present invention includes a substrate formed with a plurality of display elements; A scribing table on which the substrate is mounted so that the plurality of display elements may be separated; A hot water supply unit installed at a position spaced apart from the scribing table at a predetermined interval on the scribing table to spray hot water for a predetermined time to supply predetermined heat to the substrate seated on the scribing table Equipped.

The apparatus for manufacturing a flat panel display device may further include a sensor for sensing a temperature of the substrate, and stops spraying the hot water when the temperature of the substrate becomes higher than a predetermined temperature.

The temperature of the said hot water is 30 degreeC or more and 50 degrees C or less.

The predetermined temperature of the said board | substrate is 30 degreeC or more and 40 degrees C or less.

The hot water supply unit includes a sprinkler.

The sensor includes an infrared sensor.

A method of manufacturing a flat panel display device according to an embodiment of the present invention includes the steps of mounting a substrate on which a plurality of display devices are formed on a scribing table; Spraying hot water on the substrate for a predetermined time to supply predetermined heat to the substrate seated on the scribing table at a position spaced apart from the scribing table; Separating the plurality of display elements formed on the substrate.

The method of manufacturing the flat panel display device may further include sensing a temperature of the substrate, and stops spraying the hot water when the temperature of the substrate becomes higher than a predetermined temperature.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 and 5.

4 is a cross-sectional view schematically showing an apparatus for manufacturing an organic EL display device according to an embodiment of the present invention.

Referring to FIG. 4, an apparatus for manufacturing an organic EL display device according to an exemplary embodiment of the present invention includes a substrate 51 having a plurality of organic EL display elements 65 bonded to a cap, and a plurality of substrates 51 mounted thereon. Hot water for a predetermined time in order to supply a predetermined heat to the scribing table 70 to be separated from the organic EL display elements 65 and the substrate 51 seated on the scribing table 70. It is provided with a hot water supply sprinkler 78 for spraying.

In the hot water supply sprinkler 78 of the present invention, unlike cold water is injected from a conventional sprinkler, hot water of about 30 ° C to 50 ° C is injected.

The substrate 51 on which the plurality of organic EL display elements 65 are formed is mounted on the scribing table 70 in a state of being bent by ultraviolet rays irradiated for curing the sealant in the encapsulation process. As a result, the outer portion of the substrate 51 does not contact the scribing table 70.

The hot water supply sprinkler 78 is installed at a position spaced apart from the scribing table 70 on the scribing table 70 in the same form as a commonly used sprinkler by the scribing table 70. The temperature of the curved substrate 51 is raised by spraying hot water on the curved substrate 51 seated thereon.

At this time, the hot water injected from the hot water supply sprinkler 78 has a temperature of about 30 ° C ~ 50 ° C.

The hot water sprayed from the hot water supply sprinkler 78 raises the temperature of the curved substrate 51 to about 30 ° C. to 40 ° C., which is a temperature at which the curved substrate 51 may naturally spread on the scribing table 70. do.

Here, when the hot water sprayed from the hot water supply sprinkler 78 is sprayed onto the substrate 51 for too short a time, the temperature of the curved substrate 51 may not rise to a predetermined temperature range to spread the curved substrate 51. In addition, when hot water is sprayed onto the substrate 51 for a long time, the temperature of the bent substrate 51 may be greatly increased to further deflect or damage the substrate 51. Accordingly, the hot water sprayed from the hot water supply sprinkler 78 is adjusted so that the hot water is sprayed for a predetermined time according to the size and the degree of bending of the substrate 51.

Alternatively, the apparatus for manufacturing an organic EL display device of the present invention may further include an infrared sensor (not shown) on the outside, and detects the temperature of the substrate 51 through the infrared sensor, and the detected temperature is 30 ° C. to 40 °. In the case of ℃, it may be to automatically block the hot water injected from the hot water supply sprinkler 78.

As shown in FIG. 5 by the manufacturing apparatus of the organic EL display element of the present invention having such a configuration, the hot water supply sprinkler when the substrate 51 is bent on the scribing table 70 is seated Hot water of about 30 ° C. to 50 ° C. is injected from the 78 so that the temperature of the bent substrate 51 rises to about 30 ° C. to 40 ° C. so that the bent substrate 51 is on the scribing table 70. It will spread naturally.

Therefore, the yield of the organic EL display device is improved by reducing defects caused by not aligning the substrate 51 as it is.

As described above, in the manufacturing apparatus of the organic EL display device according to the embodiment of the present invention, the substrate naturally changes the temperature of the bent substrate by spraying hot water to the substrate bent by ultraviolet rays in the encapsulation process through a hot water supply sprinkler. The flexed substrate is unrolled by raising it to a temperature that can unfold on the scribe table. Therefore, as a result of scribing a substrate having a curved outer portion as it is, accurate defects are not achieved, thereby reducing defects. Accordingly, the yield of the organic EL display device is improved.

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 (10)

A substrate on which a plurality of display elements are formed; A scribing table on which the substrate is mounted so that the plurality of display elements may be separated; A hot water supply unit installed at a position spaced apart from the scribing table at a predetermined interval on the scribing table to spray hot water for a predetermined time to supply a predetermined heat to the substrate seated on the scribing table; Apparatus for manufacturing a flat panel display element, characterized in that provided. The method of claim 1, Further comprising a sensor for sensing the temperature of the substrate, And dispensing the hot water when the temperature of the substrate is greater than or equal to a predetermined temperature. The method of claim 1, The temperature of the hot water is 30 to 50 ℃ ℃ manufacturing apparatus of the flat panel display element. The method of claim 2, The predetermined temperature of the said board | substrate is a manufacturing apparatus of the flat panel display element characterized by the above-mentioned. The method of claim 1, The hot water supply unit is a flat panel display device manufacturing apparatus characterized in that it comprises a sprinkler. The method of claim 2, And said sensor comprises an infrared sensor. Mounting a substrate on which a plurality of display elements are formed, on a scribing table; Spraying hot water on the substrate for a predetermined time to supply predetermined heat to the substrate seated on the scribing table at a position spaced apart from the scribing table; And separating the plurality of display elements formed on the substrate. The method of claim 7, wherein Sensing the temperature of the substrate, And dispensing the hot water when the temperature of the substrate is greater than or equal to a predetermined temperature. The method of claim 7, wherein The temperature of the hot water is 30 to 50 ℃ ℃ manufacturing method of the flat panel display element. The method of claim 8, The predetermined temperature of the said board | substrate is a manufacturing method of the flat panel display element characterized by the above-mentioned.

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