KR100565745B1 - Organic electroluminescent device and manufacturing method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent device that is easy to form an electrode only in a pixel region and is effective to insulate the electrodes of each pixel region, and a method of manufacturing the same. The present invention provides a glass substrate having a plurality of pixel regions at regular intervals. A first electrode formed thereon; An insulating film formed on the first electrode between the pixel areas; Barrier ribs formed on both sides of the insulating layer and inclined in different directions toward the outside of the pixel region; A light emitting layer formed in the pixel region on the first electrode; And a second electrode formed on the light emitting layer.

Organic electroluminescent device, double bulkhead

Description

Organic electroluminescent device and its manufacturing method {ORGANIC ELECTROLUMINESCENCE DEVICE AND METHOD FOR MANUFACTURING THEREOF}

1 is a cross-sectional view showing a conventional organic electroluminescent device;

2A to 2D are cross-sectional views showing a method of manufacturing an organic electroluminescent device according to the present invention;

3 is a view for explaining an exposure method of the present invention.

Explanation of symbols on the main parts of the drawings

21 substrate 22 first insulating film

23 anode electrode 24 second insulating film

25 photosensitive film layer 25a, 25b partition wall

26 organic electroluminescent layer 27 second electrode

100: first mask 200: second mask

The present invention relates to an organic electroluminescent device, and more particularly, to an organic electroluminescent device having a double partition and a manufacturing method thereof.

Electroluminescence devices (hereinafter referred to as ELDs) have attracted attention as next-generation flat panel display devices because they have characteristics such as wide viewing angle, high aperture ratio, and high chromaticity. In particular, the organic ELD is based on the principle that when electrons are injected into the organic light emitting layer formed between the hole injection electrode and the electron injection electrode, light is generated when the electrons and holes are paired and then disappear. It is possible to drive.

The organic ELD is divided into a passive matrix ELD and an active matrix ELD according to its driving method. The passive electroluminescent element is composed of a transparent electrode on a transparent substrate, an organic EL layer on the transparent electrode, and a cathode electrode on the organic EL layer. An active electroluminescent device includes scan lines and data lines defining a pixel region on a substrate, a switching device electrically connected to the scan lines and data lines and controlling the electroluminescent device, And a transparent electrode formed in a pixel region on the substrate, an organic EL layer on the transparent electrode, and a metal electrode on the organic EL layer. Unlike passive electroluminescent devices, active electroluminescent devices further include switching devices, which are thin film transistors.

Active electroluminescent devices are classified into a top-emission method and a bottom emission method. Since the top-emission type active electroluminescent device emits light toward the metal common electrode in the organic EL layer, unlike the bottom-emission type active electroluminescent device, The metal common electrode should be thinly formed for efficient light transmission.

1 is a cross-sectional view of a general organic electroluminescent device. As shown in FIG. 1, an anode electrode 12 is formed in a stripe shape on the glass substrate 11, and an insulating layer pattern 15 and a partition wall 16 are formed on the anode electrode 12. It is formed. The organic light emitting layer 13 is formed on the anode electrode 12, and the cathode electrode 14 is formed on the organic light emitting layer 13. The partition wall 16 is formed to form the cathode electrode 14 only in the pixel region, and is formed in a negative shape having a wider upper portion than a lower portion to electrically insulate the cathode electrodes 14. It also has a function.

However, when the metallic solution is filled between the barrier ribs 16 to form an electrode only in the pixel region as described above, the solution is concentrated near the barrier rib 16 due to the surface tension due to the nature of the solution. Accordingly, an electrode may be formed on the surface of the partition wall 16 to prevent electrical insulation. In addition, since the partition 16 is negative, a process such as surface cleaning is not easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above conventional problems, and an object of the present invention is to easily form an electrode only in a pixel region and to efficiently insulate the electrodes of each pixel region from each other, and a manufacturing method. To provide.

In order to achieve the above object, the organic electroluminescent device of the present invention comprises: a first electrode formed on a glass substrate having a plurality of pixel regions at regular intervals; An insulating film formed on the first electrode between the pixel areas; Barrier ribs formed on both sides of the insulating layer and inclined in different directions toward the outside of the pixel region; A light emitting layer formed in the pixel region on the first electrode; And a second electrode formed on the light emitting layer.

A method of manufacturing an organic electroluminescent device according to the present invention includes the steps of forming a first electrode on a glass substrate having a plurality of pixel regions defined at regular intervals; Forming an insulating film on the first electrode between the pixel regions; Forming double partition walls inclined in different directions on both sides of the insulating film; Forming a light emitting layer on the first electrode corresponding to the pixel region; And forming a second electrode on the light emitting layer.

The forming of the double barrier rib may include forming a photosensitive material layer on the front surface of the first electrode and the insulating layer, and exposing and developing the photosensitive material layer twice.

In the step of exposing the photosensitive material layer twice, light is irradiated above and below the photosensitive material layer using a mask.

In the forming of the second electrode, a metal solution is filled on the light emitting layer between the double partitions by an inkjet method and then cured.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention in which the above objects can be specifically realized are described with reference to the accompanying drawings. In describing the present embodiment, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted below.

Referring to the manufacturing method of the organic electroluminescent device according to the present invention. 2A to 2E are views illustrating a method of manufacturing the organic electroluminescent device (ELD) of the present invention.

As shown in FIG. 2A, a thin film transistor (not shown) is formed on a glass substrate 21 through a conventional process. The thin film transistor includes source / drain regions, a channel region, a gate insulating layer, and a gate electrode. Thereafter, a first insulating layer 22 is formed on the substrate 21 and the thin film transistor. A metal material is deposited on the entire surface of the first insulating layer 22 to form the anode electrode 23. At this time, in the case of a bottom-emission EL device, the anode electrode 23 is formed of a transparent material such as indium-tin-oxide (ITO), and conversely, a top-emission EL device. In the case of a device, the anode electrode 23 is formed of a metal material having high reflectance and work function.

As shown in FIG. 2B, after depositing an insulating material on the entire surface of the anode electrode 23, the insulating material layer is selectively removed to form a second area in the remaining area except the pixel area, that is, the boundary area between the pixel areas. The insulating film 24 is formed.

Subsequently, a photosensitive material layer 25 is coated on the entire surface of the anode electrode 23 and the second insulating film 24, and the photosensitive material on the second insulating film 24 using photo masks 100 and 200. Layer 25 is selectively exposed. Here, the photosensitive material layer 25 is exposed twice, as shown in FIG. 3, once the light is irradiated onto the photosensitive material layer 25 using the photomask 100 and the other time. Light is irradiated under the substrate 21 using the photomask 200. In an exposure process in which light is irradiated under the substrate 21, a metal pattern (not shown) such as data wiring and gate wiring formed on the substrate 21 may be used as a mask instead of the photo mask 200.

After the exposure process, the photosensitive material layer 25 is developed with a developer to form double partitions 25a and 25b having a rhombus shape at both end portions of the second insulating layer 24 as shown in FIG. 2C. The partitions 25a and 25b are inclined toward the outside of each pixel area. Due to the shape of the partitions 25a and 25b, the area of the upper portion of the pixel region is larger than that of the lower portion. Therefore, it is easy to form a thin film inside the pixel region and to process the surfaces of the partitions 25a and 25b. In the embodiment of the present invention, the partitions 25a and 25b are formed of a photosensitive material, but may be formed of an organic insulating material or an inorganic insulating material.

Subsequently, as shown in FIG. 2D, an organic electroluminescent (EL) layer 26 is formed on the anode electrode 23 using a shadow mask (not shown) and the partitions 25a and 25b as masks. Deposit. The organic electroluminescent layer 26 is divided into RED, GREEN, and BLUE organic electroluminescent layers according to the emission color, and these R, G, and B organic electroluminescent layers 26 are formed in each pixel region in turn. The organic electroluminescent layer 26 is deposited only in the pixel region. The organic electroluminescent layer 26 may include a hole injection layer (not shown), a hole transport layer (not shown), a light emitting layer (not shown), an electron injection layer (not shown), and an electron transport layer (not shown). Not stacked). The hole injection layer and the hole transport layer inject and transfer holes supplied from the anode electrode 23 to the light emitting layer, and the electron injection layer and the electron transport layer inject electrons supplied from the cathode electrode 27 into the light emitting layer. , Pass.

The metal solution is sprayed onto the organic electroluminescent layer 26 by an inkjet method and then cured to form a cathode electrode 27. In the case of a bottom-emission EL device, the cathode electrode 27 is formed of a metal material having high reflectivity. In contrast, in the case of a top-emitting EL device, the cathode electrode 27 is formed of ITO. It is formed of a transparent material. The partitions 25a and 25b form the cathode electrode 27 only in the pixel region. In particular, since the partitions 25a and 25b are inclined toward the outside of the pixel area, it is easy to fill the metal solution inside the pixel area by an inkjet method. The cathode electrode 27 has a larger width and area than the bottom thereof. In addition, since the partitions 25a and 25b are formed in duplicate, it is possible to prevent the cathode electrodes 27 of each pixel area from being connected to each other on the surfaces of the partitions 25a and 25b.

Although not shown, a protective film (not shown) is formed to protect the organic electroluminescent layer 26 from oxygen or moisture. Then, a protective cap is formed using a sealant and a transparent substrate.

Since the partition walls are formed to be inclined toward the outside of each pixel area, it is easy to form the electrodes in an inkjet method without a shadow mask. In addition, since the partitions are formed in duplicate, the electrodes of each pixel region can be effectively insulated around the partitions.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (7)

A first electrode formed on the glass substrate having a plurality of pixel regions at regular intervals; An insulating film formed on the first electrode between the pixel areas; Barrier ribs formed on both sides of the insulating layer and inclined in different directions toward the outside of the pixel region; A light emitting layer formed in the pixel region on the first electrode; An organic electroluminescent device comprising a second electrode formed on the light emitting layer. The method of claim 1, The area of the second electrode is an organic electroluminescent device, characterized in that wider at the top than the bottom. Forming a first electrode on a glass substrate having a plurality of pixel regions defined at regular intervals; Forming an insulating film on the first electrode between the pixel regions; Forming double partition walls inclined in different directions on both sides of the insulating film; Forming a light emitting layer on the first electrode corresponding to the pixel region; A method of manufacturing an organic electroluminescent device comprising forming a second electrode on the light emitting layer. The method of claim 3, wherein The double partition wall is inclined toward the outside of the adjacent pixel region manufacturing method of the organic electroluminescent device. The method of claim 3, wherein Forming the double partition wall, Forming a photosensitive material layer on an entire surface of the first electrode and the insulating film; And exposing the photosensitive material layer twice and then developing the organic electroluminescent device. The method of claim 5, wherein Exposing the photosensitive material layer twice; The method of manufacturing an organic electroluminescent device, characterized in that for irradiating light from above and below the photosensitive material layer using a mask. The method of claim 3, wherein In the forming of the second electrode, A method of manufacturing an organic electroluminescent device, characterized in that the metal solution is filled on the light emitting layer between the double partition walls by an inkjet method and then cured.

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