KR100647005B1 - Organic electroluminescence display device and method for fabricating thereof - Google Patents

Abstract

An organic light emitting display device and a manufacturing method thereof are provided to prevent an inner sealant or a condensing material from diffusing outside the display device by arranging a separate black matrix on a scribing line forming position. An organic light emitting display device includes a lower substrate(100), an upper substrate(130), a sealing agent(132), a light blocking pattern(120), and a border layer pattern(140). The OLED(Organic Light Emitting Diode) is formed on the lower substrate. The upper substrate is arranged to face a device forming surface of the lower substrate. The sealing agent is selectively applied on the lower/upper substrate such that the lower substrate is attached to the upper substrate. The light blocking pattern is formed on the upper substrate between coloring patterns of the OLED. The border layer pattern is formed on the upper substrate to prevent diffusion of the sealing agent.

Description

Organic Electroluminescence Display Device and Method for Fabricating Thereof}

1 is a schematic cross-sectional view showing an example of a conventional organic electroluminescent display;

2 is a schematic cross-sectional view of one side of a pad end of an organic electroluminescent display device to which a conventional inner sealant is applied;

3 is a schematic cross-sectional view of a boundary portion of an organic electroluminescent display device to which a conventional inner sealant is applied;

4 is a schematic cross-sectional view of one side of a pad end of an organic light emitting display device according to an exemplary embodiment of the present invention;

5 is a schematic cross-sectional view of an interface portion of an organic electroluminescent display according to the present invention.

* Explanation of symbols for main parts of drawings *

100: lower substrate 110: organic electroluminescent device

111 emitting layer 112 colored layer pattern

120: light shielding layer pattern 130: upper substrate

132 sealant 140 boundary layer pattern

Japanese Patent Publication No. 2002-359083

The present invention relates to an organic electroluminescent display and a manufacturing method thereof, and more particularly to an organic electroluminescent display and a method for manufacturing the organic electroluminescent display for preventing pad contamination and defective scribing line due to the spreading of the inner sealant or filler. It is about.

The electroluminescent element is a spontaneous light emitting element for use as a display panel of a display device, and has attracted attention as a next-generation display element because of its advantages of having a wide viewing angle, excellent contrast, and fast response speed. have.

Such electroluminescent devices include organic electroluminescent devices and inorganic electroluminescent devices. Organic electroluminescent devices are superior to inorganic electroluminescent devices in terms of brightness, driving voltage, and response characteristics. It is becoming.

In a general organic electroluminescent device, a positive electrode layer having a predetermined pattern is formed on a substrate, and a hole transport layer, a light emitting layer, and an electron transport layer are sequentially formed on the positive electrode layer, and are orthogonal to the positive electrode layer on the electron transport layer. The negative electrode layer of the predetermined pattern is formed in the direction shown. Here, the hole transport layer, the light emitting layer and the electron transport layer are organic thin films made of an organic compound. In such a structure, when a voltage is applied between the positive electrode layer and the negative electrode layer to drive the organic electroluminescent device including the positive electrode layer, the hole transport layer, the light emitting layer, the electron transport layer and the negative electrode layer sequentially formed on the substrate, the positive electrode Holes injected from the layer move to the light emitting layer via the hole transport layer and electrons injected from the negative electrode layer move to the light emitting layer via the electron transport layer. In the light emitting layer region, holes and electron carriers combine to generate excitons. . The excitons generated as described above change from the excited state to the ground state, and the fluorescent molecules of the light emitting layer emit light by the energy emitted to form an image.

An example of such an organic electroluminescent display is disclosed in Japanese Patent Laid-Open No. 2002-359083.

Referring to FIG. 1, a conventional EL display device includes a substrate 1, an electrode layer 2 formed on the surface of the substrate 1, and a first electrode formed on the surface of the electrode layer 2. The dielectric layer 3, the light emitting layer 5 formed on the surface of the first dielectric layer 3, the second dielectric layer 6 formed on the surface of the light emitting layer 5, and the surface of the second dielectric layer 6 A transparent black electrode 7 formed on the pattern, a black matrix (hereinafter referred to as BM) 21 provided between the transparent electrode 7 formed on the pattern, and the transparent electrode formed on the pattern (7) It consists of the coloring part 11 formed on the surface, and the transparent substrate 22 arrange | positioned on this coloring part 11.

In such a conventional EL display device, since the BM 21 is formed on the EL side substrate 1, it is not necessary to form the BM 21 on the opposing transparent substrate 22, so that the choice of substrate materials is increased. It is wide and consequently reduces costs.

However, organic thin films such as the dielectric layer are easily deteriorated by moisture, and the electrodes formed on the organic thin films have a problem in that performance is degraded due to oxidation. As shown in FIG. 2, there are many internal filling encapsulation methods for applying a sealant 32 or a filler to the upper substrate 30 and bonding the upper substrate 30 to the lower substrate 10. It is used.

The internal filling encapsulation method is an encapsulation method for thinning the product, but has an advantage of encapsulating the product so that moisture or oxygen does not invade. However, since the sealant 32 or the filler is liquid, the upper substrate 30 is covered and encapsulated. When the sealant 32 is pushed out, the sealant 32 or the filler spreads to an undesired portion, for example, the pad 34 to be exposed to the outside ('A' in FIG. 2), thereby causing a device manufacturing defect. There was a problem letting.

In this case, since the work to remove the sealant 32 already applied in order to expose the pad 34, there is a problem that the production efficiency is lowered and the defective rate is increased.

3 is a schematic cross-sectional view showing a boundary portion of an organic electroluminescent display device to which a conventional internal sealant is applied, and each display device is filled with internal sealants 32a and 32b in a panel in which a plurality of display devices are formed. A sealant or a filler applied to the upper substrates 30a and 30b facing each display device so as to be encapsulated, and the upper substrates 30a and 30b are bonded to the lower substrates 10a and 10b and then adjacent to each other. Cutting the boundary area of the device, wherein the sealants 32a and 32b are pushed out, so as shown in the enlarged view, a scribing line 36 with a width of approximately 0.5 mm. There was a problem that the defects are generated and the post-process defects occur.

Accordingly, the present invention has been made to solve the above problems, by installing a separate black matrix at the outermost or scribing line forming position of the upper substrate, the inner sealant or filler spreads out of the device during the process. SUMMARY OF THE INVENTION An object of the present invention is to provide an organic electroluminescent display and a method of manufacturing the same, which can prevent outgoing defects.

In order to achieve the above object, in the present invention, a lower substrate on which an organic electroluminescent element is formed, an upper substrate disposed opposite to a side on which a surface of the organic electroluminescent element is formed, and the lower substrate and the upper substrate are formed. A sealing material selectively applied to the lower substrate or the upper substrate for bonding, a light shielding layer pattern formed on the upper substrate so as to be positioned between the colored layer patterns of the organic electroluminescent device, and the upper substrate to prevent the sealing material from spreading. An organic electroluminescent display including a boundary layer pattern formed is provided.

The sealing material may be configured to be filled between the lower substrate and the upper substrate to seal the organic electroluminescent device.

The boundary layer pattern is formed on the outermost side of the upper substrate so as to face the pad formation position of the lower substrate, or is formed in the boundary region of display apparatuses adjacent to each other in a panel on which a plurality of display apparatuses are formed.

In this case, the boundary layer pattern may be formed at least 0.2 mm apart from the active area, and in a panel in which a plurality of display devices are formed, the boundary layer pattern may be scribed from the active area at least 0.2 mm away from the active area. It is preferable to be formed within the range up to 0.1 mm inside the ice line.

In addition, the boundary layer pattern may be formed at an edge of the sealing material applying region to form an entire edge of the display device to which the sealing material is applied.

Here, the boundary layer pattern may be one selected from a metal material, a carbon-based organic material, or a resin material, and is characterized in that the same black matrix as the light shielding layer pattern.

In addition, the lower substrate is characterized in that the silicon substrate.

Such a method of manufacturing an organic electroluminescent display device according to the present invention may include forming a plurality of organic electroluminescent devices on a lower substrate, and a light blocking layer pattern positioned between a colored layer pattern of the organic electroluminescent device on an upper substrate. And simultaneously forming a boundary layer pattern for preventing the spreading of the sealing material, applying the sealing material to the upper substrate, bonding the lower substrate and the upper substrate, and curing the sealing material.

Here, the boundary layer pattern may be formed at the outermost side of the upper substrate so as to face the pad formation position of the lower substrate, or may be formed in the boundary region of adjacent display apparatuses in a panel in which a plurality of display apparatuses are formed. The method may further include forming a plurality of independent display devices by cutting the lower substrate and the upper substrate into the boundary region where the boundary layer pattern is formed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

4 is a schematic cross-sectional view of one side of a pad end of the organic electroluminescent display of the present invention. The organic electroluminescent display of the present invention includes a light emitting layer 111 and a colored layer pattern 112 on a lower substrate 100. An organic electroluminescent device (110) is formed, an upper substrate (130) is disposed to face the side of the formation surface of the organic electroluminescent device (110) on the lower substrate (100), and the organic electroluminescent device An inner sealant 132, which is a sealing material, is filled between the lower substrate 100 and the upper substrate 130 to seal the 110, and positioned between the colored layer patterns 112 of the organic electroluminescent device 110. The light shielding layer pattern 120 is formed on the upper substrate 130, and a separate boundary layer pattern 140 is formed on the upper substrate 130 to prevent spreading of the sealant 132.

Herein, a description will be given of an exemplary embodiment of an internal filling method in which the sealant 132 is filled between the lower substrate 100 and the upper substrate 130 to seal the organic electroluminescent device 110. However, the present invention is not limited to the organic electroluminescent display device of the internal filling method. For example, the sealant 132 is provided only at the edge of the substrate to bond the lower substrate 100 and the upper substrate 130 to each other. Of course, it is also widely applicable to a display device that is coated and bonded.

When the display device formed here is of a top emission type, the lower substrate 100 does not need to be a transparent material, but a substrate other than glass, for example, a silicon substrate (LTPS glass) may be used.

The light shielding layer pattern 120 is a black matrix that fills between the colored layer patterns 112, which are usually represented by R, G, and B. The present invention provides the boundary layer pattern 140 with the same black as the light shielding layer pattern 120. It is characterized by forming in a matrix.

That is, the boundary layer pattern 140 is a black matrix formed at the same time when the light shielding layer pattern 120 is formed on the upper substrate 130. The light shielding layer pattern 120 and the boundary layer pattern 140 are made of metal or carbon. It may be one selected from the organic material or resin material of the system.

Here, the boundary layer pattern 140 may have pads 134 of the lower substrate 100 so as to prevent spreading defects that the inner sealant 132 spreads out of the pad 134 of the lower substrate 100 during the process. It is formed on the outermost side of the upper substrate 130 facing the formation position.

Specifically, the boundary layer pattern 140 may be formed at least 0.2 mm apart from the active region. That is, the boundary layer pattern 140 may be formed at least 0.2 mm away from the active region in consideration of a process margin.

Referring to the process of manufacturing the organic electroluminescent display device as described above, first, a plurality of organic electroluminescent devices 110 are formed on the lower substrate 100, and the organic electroluminescent devices ( A light shielding layer pattern 120 and a boundary layer pattern 140 are formed simultaneously between the colored layer patterns 112 of 110, and the sealant 132 is applied to the upper substrate 130 as a sealant, and the lower portion is The process of bonding the substrate 100 and the upper substrate 130 to each other proceeds. Of course, a process of curing the sealant 132 is added later.

In the organic electroluminescent display device as described above, the sealant 132 is applied to the upper substrate 130 as a sealing material, and the liquid sealant 132 is pushed out when the sealant 132 is covered with the upper substrate 130. The boundary layer pattern 140 serves as a barrier to prevent the sealant 132 from falling onto the pad 134.

Therefore, in the related art, the sealant 132 may be spread to the pad 134 to solve the problem of device manufacturing defects.

In addition, the boundary layer pattern 140 of the present invention as described above to form the entire edge of the display device to which the sealant 132 is applied as well as the outermost of the upper substrate 130 facing the pad 134 forming position. It is more preferable to form at the edge of the sealant 132 coating area of the upper substrate 130.

5 is a schematic cross-sectional view of a boundary portion of an organic electroluminescent display device according to an exemplary embodiment of the present invention, wherein boundary layer patterns 240a and 240b are formed in boundary regions of adjacent display devices in a panel in which a plurality of display devices are formed. Shows.

That is, in a panel in which a plurality of display devices are formed, the sealants 232a and 232b are disposed on the upper substrates 230a and 230b facing each display device so as to fill and seal the respective display devices with the inner sealants 232a and 232b. ) Is applied and the upper substrates 230a and 230b are bonded to the lower substrates 210a and 210b, and then the boundary regions of adjacent display devices are cut. The organic electroluminescent display device of the present invention is applied. The boundary layer patterns 240a and 240b are formed in the boundary area of the display device that becomes the scribing line.

In this case, the boundary layer patterns 240a and 240b may be formed within a range of at least 0.2 mm away from the active area to 0.1 mm inside the scribing line of the boundary area. This limits the position range of the boundary layer patterns 240a and 240b in consideration of the tolerance of the scribing line when cutting the boundary region.

As described above, in the present invention in which the boundary layer patterns 240a and 240b are formed in the boundary region of the display device, the sealants 232a and 232b are not pushed to the scribing line due to the boundary layer patterns 240a and 240b. As a result, when the lower substrates 210a and 210b and the upper substrates 230a and 230b are cut, the scribing line defect may be solved.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

According to the present invention as described above by forming a black matrix on the sealing substrate to improve the external light visibility of the front emission and at the same time by installing a separate black matrix in the outermost or scribing line forming position, the inner sealant or filler It is possible to prevent the spread failure that spreads to the outside of the device during the process.

In addition, by forming the spread prevention film using the black matrix, there is an effect that can improve the device manufacturing yield and stability without an additional process.

Claims (17)

A lower substrate on which the organic electroluminescent device is formed; An upper substrate disposed opposite the forming surface side of the organic electroluminescent element in the lower substrate; A sealing material selectively applied to the lower substrate or the upper substrate to bond the lower substrate and the upper substrate; A light blocking layer pattern formed on the upper substrate so as to be positioned between the colored layer patterns of the organic electroluminescent device; And Boundary layer pattern formed on the upper substrate to prevent the sealing material from spreading Organic electroluminescent display comprising a. The method of claim 1, And the sealing material is filled between the lower substrate and the upper substrate to seal the organic electroluminescent element. The method according to claim 1 or 2, And the boundary layer pattern is formed on the outermost side of the upper substrate so as to face the pad formation position of the lower substrate. The method of claim 3, And the boundary layer pattern is formed at an interval of at least 0.2 mm in the active region. The method according to claim 1 or 2, And the boundary layer pattern is formed in a boundary region of adjacent display devices in a panel on which a plurality of display devices are formed. The method of claim 5, And the boundary layer pattern is formed within a range from at least 0.2 mm away from the active region to 0.1 mm inside the scribing line of the boundary region. The method according to claim 1 or 2, And the boundary layer pattern is formed at an edge of the sealing material applying region to form an entire edge of the display device to which the sealing material is applied. The method according to claim 1 or 2, The boundary layer pattern is an organic electroluminescent display device, characterized in that the selected material of a metallic material, a carbon-based organic material or a resin material. The method according to claim 1 or 2, The boundary layer pattern is the same black matrix as the light blocking layer pattern. The method according to claim 1 or 2, And the lower substrate is a silicon substrate. Forming a plurality of organic electroluminescent devices on the lower substrate; Simultaneously forming a light shielding layer pattern positioned between the colored layer patterns of the organic electroluminescent device on the upper substrate and a boundary layer pattern for preventing the spreading of the sealing material; Applying a sealing material to the upper substrate; Bonding the lower substrate and the upper substrate together; And A method of manufacturing an organic electroluminescent display device comprising the step of curing the sealing material. The method of claim 11, And the boundary layer pattern is formed on the outermost side of the upper substrate so as to face the pad formation position of the lower substrate. The method of claim 12, And the boundary layer pattern is formed at least 0.2 mm apart from the active area. The method of claim 11, The boundary layer pattern is formed in a boundary area of the display device adjacent to each other in a panel on which a plurality of display devices are formed. The method of claim 14, And the boundary layer pattern is formed within a range of at least 0.2 mm away from the active region to 0.1 mm inside the scribing line of the boundary region. The method of claim 11, And the boundary layer pattern is formed at an edge of the sealing material applying region to form an entire edge of the display device to which the sealing material is applied. The method of claim 14, And cutting the lower substrate and the upper substrate into a boundary region in which the boundary layer pattern is formed, to form a plurality of independent display devices.

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