KR20050051072A - Method for preparing an organic light emitting display device comprising a method for forming a pixel defined layer - Google Patents

Abstract

The present invention relates to a method of manufacturing an organic electroluminescent device comprising a method of forming a pixel defining layer, comprising the steps of: a) patterning and forming a first electrode on a substrate; b) a pixel over the entire surface of the substrate on the first electrode; Forming a defining layer, c) opening a portion of the upper part of the first electrode by peeling the pixel defining layer by irradiating a laser including a portion of the pixel defining layer overlapping the first electrode and the pixel defining layer; and d) forming a light emitting layer on the open first electrode, and e) stacking a second electrode on the light emitting layer to form a light emitting layer. It is possible to prevent the positive film from being decomposed and affect the organic electroluminescent device, which improves lifespan characteristics and stability. It is possible to selectively finely pattern only the upper portion of the lower patterned lower electrode without a scratch, and to control the energy power of the laser to be irradiated. It is also easy to adjust, there are many ways to apply the process after this has the advantage that there is no process limitation.

Description

A manufacturing method of an organic electroluminescent device including a method of forming a pixel defining layer TECHNICAL FIELD

[Industrial use]

The present invention relates to a method of manufacturing an organic electroluminescent device, and more particularly, to a method of forming a pixel defining layer for defining a pixel for emitting light in manufacturing an organic light emitting device panel. It relates to a method for producing an organic electroluminescent device panel.

[Prior art]

2. Description of the Related Art In general, an organic light emitting display device is an active light emitting display device, and has been attracting attention as a next generation display device because of its advantages of wide viewing angle, excellent contrast, and fast response speed.

The organic electroluminescent device is classified into an inorganic EL device and an organic EL device according to a material for forming an emitting layer. Herein, the organic EL device has an advantage of excellent luminance, driving voltage, and response speed characteristics, and multicoloring, in comparison with the inorganic EL device.

1A through 1E are cross-sectional views sequentially illustrating a method of manufacturing an organic EL device using a conventional method of manufacturing a pixel defining layer.

Referring to FIG. 1A, a first electrode, that is, a lower electrode 110, is stacked and patterned on an insulating substrate 100.

Subsequently, as illustrated in FIG. 1B, a material for forming the pixel defining layer 120 is stacked over the entire surface of the substrate to define a pixel region in which the emission layer is to be formed. As the material for forming the pixel defining layer 120, an organic film, which is an insulating material, may be used. Since the place where the photoreaction is performed by a subsequent photolithography process should be removed, the material may be a photoreactive material. Therefore, polyacrylate or the like is generally used as an organic material used as a photoresist material.

After the material of the pixel defining layer 120 is laminated, the pixel defining layer 120 of the pixel area A is removed by irradiating UV light using a photo mask 10 on the top to pattern the pixel defining layer 120. To open the first electrode.

Thereafter, as shown in FIG. 1E, a light emitting layer is formed by stacking a light emitting material in the pixel region A in which the first electrode is opened, and forming a light emitting layer. Complete the electroluminescent element.

However, since the conventional pixel defining layer 120 is a photoreactive material, there is a problem in that the light stability is low, and the generation of impurities due to short-term or long-term chemical decomposition may adversely affect device characteristics.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object of the present invention is to provide an organic electroluminescence comprising a method of forming a pixel defining layer in a physical-chemically stable manner and easily adjusting the thickness and surface properties. It is to provide a method of manufacturing the device.

The present invention to achieve the above object, the present invention

a) patterning and forming a first electrode on the substrate,

b) forming a pixel defining layer over the entire substrate on the first electrode,

c) peeling the pixel defining layer by irradiating a laser including a portion of the pixel defining layer overlapping the first electrode and the pixel defining layer to open a portion of the upper part of the first electrode;

d) forming a light emitting layer on the open first electrode, and

e) providing a method of manufacturing an organic electroluminescent device, comprising forming a second electrode on the emission layer.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

2A through 2F are cross-sectional views sequentially illustrating a method of manufacturing an organic EL device using a method of manufacturing a pixel defining layer, according to example embodiments.

Referring to FIG. 2A, first, a conductive film is stacked on a substrate 100 and then patterned to form a first electrode 110.

As illustrated in FIG. 2B, an insulating material for forming the pixel defining layer 120 is stacked on the first electrode 110.

As the lamination method, it is preferable to use one method selected from the group consisting of solution coating, chemical vapor deposition, and sputtering.

Then, as shown in FIG. 2C, the laser is irradiated to the portion where the pixel region is to be defined. In this case, energy is transmitted to the insulating material 120 forming the substrate 100, the first electrode 110, and the pixel defining layer by a laser. The insulating material is peeled off by the energy transferred to the first electrode 110 through the insulating material. In addition, the form in which the insulating material is peeled off differs depending on the type of the insulating material.

That is, FIG. 2C illustrates a case in which the insulating material has a low absorption in the wavelength region of the laser. Therefore, energy transfer is gradually decreased in the portion in contact with the first electrode 110, so that the insulating material has a trapezoidal shape. The first electrode 110 is opened to form a pixel area A.

In this case, the laser beam 200 includes all portions where the first electrode 110 and the pixel defining layer 120 overlap each other, and energy must be irradiated to a wider area.

In contrast, in another embodiment of the present invention, when the insulating material has high energy absorption in the wavelength region of the laser, since the laser energy is well transmitted to the lower first electrode 110, the first electrode (see FIG. As shown in FIG. 2D, only the portion where the pixel region A is defined, as shown in FIG. Irradiate the laser.

Then, as shown in FIG. 2F, the pixel defining layer 120 formed in the pixel region of the pixel defining layer 120 has a vertical shape in which the pixel defining layer 120 is peeled off to open the first electrode. (A) is formed.

Then, as illustrated in FIG. 2G, an organic electroluminescent device is manufactured by stacking a light emitting material on the pixel region A and forming and encapsulating a second electrode over the entire surface of the substrate.

In this case, it is preferable to use an organic material as the insulating material for forming the pixel defining layer 120 to be used.

The organic material may be polystyrene, polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), polyamide, polyimide, polyarylether, heterocyclic polymer. (heterocyclic polymer), parylene, fluorine-based polymer, epoxy resin, benzocyclobutene series resin, siloxane series resin and silane resin Use one substance selected from

3A is a plan view of a layout of a pixel portion showing a method of irradiating a laser when the organic insulating film constituting the pixel defining layer 120 has a small absorption at a laser energy wavelength.

Referring to FIG. 3A, in the first exemplary embodiment of the present invention, the pixel area A of the pixel portion is entirely exposed with a laser and sequentially irradiated with a laser scanning method including all portions where the first electrode is formed. The first electrode is opened to form the pixel region A. FIG.

3B is a plan view of a layout of a pixel portion showing a method of irradiating a laser when the organic insulating film forming the pixel defining layer 120 has a large absorption at a laser energy wavelength.

Referring to FIG. 3B, in this case, the photomask image 10 having the shape of the pixel region A may be projected onto the substrate using a projection lens to simultaneously form the pixel region with respect to the pixel region having a predetermined area.

As described above, the method of manufacturing the organic EL device including the method of forming the pixel defining layer according to the present invention can prevent the pixel defining layer from being decomposed and affecting the organic EL device as compared with the conventional method. It is possible to selectively and finely pattern only the upper part of the pre-patterned lower electrode without the need for a separate precise mask.

In addition, since the energy power of the irradiated laser can be adjusted, the thickness of the pixel defining layer can be adjusted accordingly, and the surface characteristics of the pixel defining layer can also be easily adjusted, so there are many methods to apply the process thereafter. The advantage is that there is no limit.

1A through 1E are cross-sectional views sequentially illustrating a method of manufacturing an organic EL device using a conventional method of manufacturing a pixel defining layer.

2A through 2G are cross-sectional views sequentially illustrating a method of manufacturing an organic EL device using a method of manufacturing a pixel defining layer according to an exemplary embodiment of the present invention.

3A is a plan view of a pixel area of an organic light emitting diode viewed from above when a pixel defining layer is formed according to the first exemplary embodiment of the present invention.

3B is a plan view of a pixel area of an organic light emitting diode viewed from above when a pixel defining layer is formed according to the second exemplary embodiment of the present invention.

Claims (6)

a) patterning and forming a first electrode on the substrate; b) forming at least one pixel defining layer over the entire surface of the first electrode; c) peeling the pixel defining layer by irradiating a laser including a portion of the pixel defining layer overlapping the first electrode and the pixel defining layer to open a portion of the upper portion of the first electrode; d) forming a light emitting layer on the open first electrode; And e) stacking and forming a second electrode on the light emitting layer. The method of claim 1, And in the step c), the region irradiated with the laser includes a portion in which the pixel defining layer and the second electrode overlap each other. The method of claim 1, The method of claim c) wherein the region irradiated with the laser includes a portion of the pixel defining layer and the first electrode overlapping each other. The method of claim 1, The pixel defining layer is made of polystyrene, polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), polyamide, polyimide, polyarylether, heterocyclic polymer ( heterocyclic polymer, parylene, fluorine-based polymer, epoxy resin, benzocyclobutene series resin, siloxane series resin and silane resin The manufacturing method of the organic electroluminescent element which consists of 1 type of substance chosen. The method of claim 1, In the step b), the pixel defining layer is manufactured by using one method selected from the group consisting of solution coating, chemical vapor deposition, and sputtering. The method of claim 3, wherein When the laser irradiation area is a part of the overlapping portion of the pixel defining layer and the first electrode, an organic electroluminescence which simultaneously forms a pixel having a predetermined area by projecting a mask image of a pixel shape onto a substrate using a projection lens. Method of manufacturing the device.