KR20030071998A - Organic electro luminescence device and method for manufacturing display of the same - Google Patents

Abstract

PURPOSE: An organic electroluminescence device is provided to prevent generation of a gas at fabricating and to improve the life and characteristic of a display by making a gas in a device absorbed. CONSTITUTION: An anode electrode(21) is formed on a top of a glass substrate(20), and an organic film(23) is formed on a top of the anode electrode. A desiccant insulation film(22) is formed on a top of the anode electrode so as to surround an outer side of the organic film, and a cathode electrode(24) is formed on the organic film. The desiccant insulation film is formed using one selected from a group of MgO, BaO, CaO and SrO.

Description

Organic electroluminescent device and display manufacturing method using the same {Organic electro luminescence device and method for manufacturing display of the same}

The present invention relates to an organic electroluminescent device and a display manufacturing method using the same. More particularly, the organic electroluminescent display is manufactured by applying a desiccant insulating film without an outgassing source, thereby producing an organic electroluminescent display. The present invention relates to an organic electroluminescent device capable of preventing generation and absorbing a gas inherent in advance and improving a lifespan and characteristics of a display, and a display manufacturing method using the same.

Recently, an organic electroluminescent display (OELD) using an organic EL element is rapidly developing.

The organic electroluminescent display is very thin and can be arrayed in a matrix form, which has the advantage of being driven at a low voltage of about 5 to 20 V, and has excellent characteristics such as wide viewing angle, high speed response, and high contrast. It can be used for display of surface light source and display of mobile communication terminal, and is suitable for next-generation flat panel display because it is thin, light, and has good color.

Let's look at the basic configuration and operation of these organic electroluminescent displays.

1 is a two-pixel cross-sectional view of a conventional organic electroluminescent display, in which a transparent anode electrode 12 is formed on a glass substrate 11, an organic film 13 is formed on the anode electrode 12, and an organic The cathode electrode 14 is formed on the layer 13, and the organic layer 13 and the cathode electrode 14 are surrounded by the insulating layer 15 and the partition 16 to implement pixels of the display.

The organic electroluminescent display has an exciton generated by combining electrons and holes injected from cathode and anode electrodes, respectively, from the excited state to the ground state, and emits light from the organic layer 13 so as to emit light from the substrate 11. Through the light is emitted to the outside.

Therefore, light is emitted from each pixel of each organic electroluminescent display.

In the above-mentioned general organic electroluminescent display, the insulating film 15 and the partition 16 are used as the photoresist which is an organic substance.

The organic insulating film and the partition wall serve as a source of outgassing during the deposition of the organic film 13 or during the operation of the display, thereby reducing the life of the display.

In particular, the gas outgassed from the organic insulating film and the partition wall adversely affects the indium tin oxide (ITO) film, which is an anode electrode.

More specifically, outgassed gas flows into the pinhole present in the ITO film, and gas trapped in the pinhole flows out to oxidize the cathode electrode, and the organic film and the cathode electrode are oxidized by oxidation of the cathode electrode. The exfoliation prevents the organic film from emitting light.

In order to solve this problem, the can 20 is adhered to the top of the glass substrate 11 with a UV sealant 21 to surround the organic electroluminescent display, and the absorbent 22 is formed inside the can 20. ) Is inserted. The can 20 prevents gas and moisture from entering the display from the outside, and the moisture absorbent 22 absorbs the outgassed gas generated in the organic electroluminescent display.

However, in the can structure, it is impossible to completely absorb the gas outgassed from the photoresist insulating film and the partition wall with the absorbent inside the can, so that the characteristics and lifespan of the device are deteriorated due to the gas still outgassed in the display.

Accordingly, the present invention has been made to solve the above problems, by applying a desectant insulating film without an outgassing source, to produce an organic electroluminescent display, to prevent the generation of outgassing during manufacturing and driving The present invention also provides an organic electroluminescent device and a display manufacturing method using the same, which can absorb a gas contained in the device, thereby improving the lifespan and characteristics of the display.

A preferred aspect for achieving the above object of the present invention is an anode electrode formed on the glass substrate;

An organic film formed on the anode electrode;

A desiccant insulating layer formed on the anode electrode and surrounding the outside of the organic layer;

Provided is an organic electroluminescent device comprising a cathode electrode formed on the organic layer.

Another preferred aspect for achieving the above object of the present invention comprises a first step of forming a plurality of anode electrode lines spaced apart from each other on top of the glass substrate;

Forming a desiccant insulating film on the glass substrate and the plurality of anode electrode lines, the desiccant insulating layer having matrix openings exposing the anode electrode lines;

Forming an organic layer on each of the upper portions of the anode electrode lines exposed by the openings;

A method of manufacturing an organic electroluminescent display is provided, which comprises a fourth step of crossing the anode electrode lines on the organic layer and forming separate cathode electrode lines.

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

2 is a cross-sectional view of an organic electroluminescent display in which a conventional can is formed.

3A to 3D are plan views of a process for forming a desiccant insulating film in an organic electroluminescent display according to the present invention.

4 is a cross-sectional view of an organic EL device according to the present invention.

5 is a plan view showing another process for forming a desiccant insulating film in the organic electroluminescent display according to the present invention.

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

10,20: glass substrate 11: anode electrode line

11 ': pixels 12,13,30: shadow mask

21 anode electrode 22 desiccant insulating film

23 organic film 24 cathode electrode

31: give portion 32: pixel breaking portion

33: bridge 34: opening

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

3A to 3D are plan views illustrating a process of forming a desiccant insulating film in an organic electroluminescent display according to the present invention. First, a plurality of anode electrode lines 11 spaced apart from each other on an upper portion of the glass substrate 10 are illustrated. (Fig. 3a)

Thereafter, the anode electrode lines 11 face opposite sides and are parallel to the anode electrode lines 11 and spaced apart from the openings 12a, 12b, 12c, 12d, 12e, 12f, and 12g, respectively. A first shadow mask 12 having a top surface is placed on the plurality of anode electrode lines 11, and a desiccant insulating film is deposited (FIG. 3B).

In this case, a separate insulating film is formed on side surfaces of the plurality of anode electrode lines 11.

Subsequently, the plurality of second shadow masks 13 are rotated by 90 ° from the anode electrode lines 11 and each of the second shadow masks 13 includes openings 13a, 13b, 13c, 13d, 13e, 13f, and 13g, respectively. The anode electrode lines 11 are placed on top, and the desiccant insulating layer is deposited again (FIG. 3B).

Here, the desiccant insulating film is preferably deposited with any one selected from MgO, BaO, CaO, and SrO, and the MgO, BaO, CaO, and SrO absorb the gas outgassed in the organic electroluminescent display and have insulation.

The desiccant insulating film is preferably formed to a thickness of 1000 to 50000 kPa.

Therefore, when the process of FIG. 3B is performed, the desiccant insulating film deposited through the openings of the second shadow mask 13 is rotated 90 ° with the desiccant insulating film deposited through the openings of the first shadow mask 12. In the direction, and eventually, pixels 11 'in the form of a matrix surrounded by a desiccant insulating film are formed on the anode electrode lines (FIG. 3D).

Afterwards, an organic film is formed on the anode electrode lines in the pixels 11 ', and an organic electroluminescence is formed on the organic film by crossing the anode electrode lines and forming separate cathode electrode lines. The display is finished manufacturing.

As shown in FIG. 4, one pixel of the organic electroluminescent display, that is, the organic electroluminescent element, includes an anode electrode 21 formed on the glass substrate 20; An organic layer 23 formed on the anode electrode; A desiccant insulating layer 22 formed on the anode electrode and surrounding the outside of the organic layer 23; The cathode electrode 24 is formed on the organic layer 23.

FIG. 5 is a plan view illustrating another process for forming a desiccant insulating film in an organic electroluminescent display according to the present invention, and includes a pixel blocking unit for masking an area where pixels of an organic electroluminescent display are formed; 32); Bridges 33 connecting the pixel blocking units 32 along the anode electrode line 11; A guide part 31 connected to a surface of the bridge 33 not connected to the pixel blocking part 32 to fix the pixel blocking parts 32; A third shadow mask 30 composed of openings 34 formed parallel to the anode electrode line 11 between the pixel blocking portions 32, the bridge 33, and the guide portion 31 is an anode. The electrode line 11 is placed on the glass substrate 10 on which the electrode lines 11 are formed, and a desiccant insulating layer is deposited.

A desiccant insulating film is deposited through the openings 34, so that no desiccant insulating film is formed in the anode electrode lines 11 having the pixel blocking portion 32 and the bridge 33.

Accordingly, the pixel 11 ′ in a matrix form surrounded by a desiccant insulating layer is formed on the anode electrode lines. Of course, the anode electrode lines are exposed between the pixel and the pixel in a bridge form by a desiccant insulating layer.

As in the process of FIG. 5, an organic layer is formed on the pixels 11 ′ where the anode electrode lines are exposed by the desiccant insulating layer, and the cathode intersects with the anode electrode lines on the organic layer. By forming the electrode lines, the organic electroluminescent display is completed in manufacture.

Therefore, in the present invention, the organic electroluminescent display is manufactured by applying a desiccant insulating film that does not generate outgassing, thereby preventing generation of outgassed during manufacturing and driving, and absorbing the gas inherent in the device. There is an advantage to improve the life and characteristics of the display.

In addition, in the present invention, as described above, the desiccant insulating film may be formed using a shadow mask, but the desiccant insulating film may be formed using a conventional photolithography process or a screen printing method.

As described in detail above, the present invention applies a desiccant insulating film without an outgassing source to prepare an organic electroluminescent display, and prevents generation of outgassed gas during manufacturing and driving as compared with the existing organic insulating film. The gas also absorbs the gas inherent in the device, thereby improving the lifespan and characteristics of the display.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (8)

An anode electrode formed on the glass substrate; An organic film formed on the anode electrode; A desiccant insulating layer formed on the anode electrode and surrounding the outside of the organic layer; The organic electroluminescent device comprising a cathode electrode formed on the organic film. The method of claim 1, The desiccant insulating film is an organic electroluminescent device, characterized in that deposited on any one selected from MgO, BaO, CaO and SrO. Forming a plurality of anode electrode lines spaced apart from each other on top of the glass substrate; Forming a desiccant insulating film on the glass substrate and the plurality of anode electrode lines, the desiccant insulating layer having matrix openings exposing the anode electrode lines; Forming an organic layer on each of the upper portions of the anode electrode lines exposed by the openings; And a fourth step of forming the cathode electrode lines crossing the anode electrode lines and separated from each other on the organic layer. The method of claim 3, wherein The second step is A first shadow mask is exposed on the plurality of the anode electrode lines and exposes the side surfaces of the anode electrode lines facing each other, the first shadow mask being parallel to the anode electrode lines and spaced apart from each other, and depositing a desiccant insulating film. Making a step; A second shadow mask rotated by 90 ° from the anode electrode lines, the second shadow mask having openings spaced apart from each other, and then placed on top of the plurality of anode electrode lines, and again depositing a desiccant insulating layer. And forming a desiccant insulating film on the glass substrate and the plurality of anode electrode lines, the matrix insulating layer having openings in the form of a matrix. The method of claim 3, wherein The second step is Pixel blocking units for masking an area where pixels of the organic electroluminescent display are formed; Bridges connecting the pixel blocking portions along the anode electrode line; A guide part connected to the bridge surface not connected to the pixel blocking part to fix the pixel blocking parts; A shadow mask composed of openings formed in parallel with the anode electrode line between the pixel blocking portions, the bridge, and the guide part is placed on an upper portion of the glass substrate on which the anode electrode lines are formed, and a desiccant insulating layer is deposited to deposit the anode. And forming a desiccant insulating layer having matrix openings exposing electrode lines on the glass substrate and the plurality of anode electrode lines. The method according to any one of claims 3 to 5, The desiccant insulating film is MgO, BaO, CaO and SrO is deposited by any one selected from the organic electroluminescent display manufacturing method. The method according to any one of claims 3 to 5, The desiccant insulating film is an organic electroluminescent display manufacturing method characterized in that formed to a thickness of 1000 ~ 50000Å. The method according to any one of claims 3 to 5, The desiccant insulating layer is formed by using a photolithography process or a screen printing method.