KR100778413B1 - Passive matrix type organic light emitting display and method for manufacturing thereof - Google Patents

Abstract

A passive matrix type organic light emitting display device and a method for manufacturing the same are provided to remove an additional process for forming an external light absorbing unit by absorbing the external light at a separator. A passive matrix type organic light emitting display device includes a substrate(10), a first electrode(20), an insulation film(30), a separator(40), an organic light emitting layer(50) and a second electrode(60). The first electrode is formed to have a stripe pattern on the substrate. The insulation film exposes a light emitting region of the first electrode. The separator is stacked on the insulation film in a perpendicular direction to the first electrode. The organic light emitting layer is stacked an inter-space of the separator in a perpendicular direction to the first electrode. The second electrode is stacked on the light emitting layer. The separator has an overhang structure and is composed of a photosensitive material having a black pigment.

Description

Passive organic light emitting display and a method of manufacturing the same {PASSIVE MATRIX TYPE ORGANIC LIGHT EMITTING DISPLAY AND METHOD FOR MANUFACTURING THEREOF}

1 is an external perspective view of a passive organic light emitting display device according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line "II-II" of FIG. 1.

3 is a process block diagram illustrating the manufacturing method of FIG. 1.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passive organic light emitting display and a method of manufacturing the same, and more particularly, to a passive organic light emitting display having improved clear room contrast and a method of manufacturing the same.

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 Display (LCD), Field Emission Display (FED), Plasma Display Panel (PDP) and Organic Light Emitting Display (PDP). Etc.

The organic light emitting diode display is a self-luminous display device that electrically excites an organic compound to emit light. The organic light emitting diode display may display an image by voltage driving or current driving N × M organic light emitting devices.

The organic light emitting diode has a diode characteristic and is also called an organic light emitting diode, which is composed of an anode electrode as a hole injection electrode, an organic thin film as a light emitting layer, and a cathode electrode as an electron injection electrode. Holes and electrons are injected into the organic thin film to emit light when an exciton in which holes and electrons are combined falls from an excited state to a ground state.

The organic light emitting diode display having such a configuration may be classified into an active matrix type organic light emitting display and a passive matrix type organic light emitting display according to a driving method.

The configuration of the passive organic light emitting display device will be briefly described as follows.

An anode electrode is formed in a stripe pattern in the display area of the substrate, and the light emitting area of the anode electrode is exposed by an inter insulator.

A separator is stacked on the insulating film in a direction orthogonal to the anode, and a light emitting layer and a cathode are sequentially stacked in the space between the separators.

However, the light emitting layer has a property of being easily deteriorated by moisture and oxygen. Therefore, in order to prevent deterioration of a light emitting layer, the display area of a board | substrate is normally sealed using the sealing substrate, and the moisture absorption material is formed in the inner surface of the sealing substrate.

The passive organic light emitting diode display having such a configuration has an aperture ratio of approximately 50 to 60% and has a non-emission area of approximately 40 to 50%.

Therefore, if absorbed without reflecting external light in the non-light-emitting region, the clear room contrast is increased by approximately twice or more.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a passive organic light emitting display device in which a bright room contrast is increased by absorbing external light in a non-light emitting area.

Another object of the present invention is to provide a manufacturing method capable of effectively manufacturing a passive organic light emitting display device having increased bright room contrast.

The present invention to achieve the above object,

Board;

A first electrode formed on the substrate in a stripe pattern;

An insulating film exposing the light emitting region of the first electrode;

A separator stacked on the insulating film in a direction orthogonal to the first electrode;

An organic light emitting layer stacked in a space between the separators in a direction orthogonal to the first electrode; And

A second electrode stacked on the organic light emitting layer

Including;

The separator provides a passive organic light emitting device formed of a material including a black pigment.

In an embodiment of the present invention, the separator is formed of an overhang structure and is formed of a photosensitive material including a black pigment.

Passive organic light emitting display device having such a configuration,

Forming a first electrode on one surface of the substrate in a stripe pattern;

Forming an insulating film exposing the light emitting region of the first electrode;

Forming a separator in a direction orthogonal to the first electrode;

Forming an organic emission layer in a space between the separators in a direction orthogonal to the first electrode; And

Forming a second electrode on the organic light emitting layer

It includes, wherein forming the separator,

Forming a photosensitive material including a black pigment to a predetermined thickness; And

The photosensitive material may be manufactured by a method of manufacturing a passive organic light emitting display device including patterning the photosensitive material into an overhang structure.

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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is an external perspective view of a passive organic light emitting display device according to an exemplary embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.

As illustrated, the anode electrode 20 is formed in a stripe pattern in the display area of the substrate 10, and the light emitting area of the anode electrode 20 is exposed by an inter insulator 30. Here, the insulating film may be configured to expose the light emitting region in a plurality of lattice pattern.

A separator 40 is stacked on the insulating layer 30 in a direction orthogonal to the anode electrode 20, and the separator 40 has an overhang structure in which an upper end portion has a wider width than a lower end portion. Is formed.

The organic light emitting layer 50 and the cathode electrode 60 are sequentially stacked on the anode electrode 20 in the space between the separators 40.

Here, the anode electrode 20 serves as a first electrode for supplying holes to the organic light emitting layer 50, and the cathode electrode 60 serves as a second electrode for supplying electrons to the organic light emitting layer 50.

In addition, the organic light emitting layer 50 may be formed by stacking a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injection layer. Of course, a hole injection layer may be further formed between the hole transport layer and the anode electrode 20.

The passive organic light emitting diode display having such a configuration has an exciton in which holes and electrons injected into the organic light emitting layer 50 from the anode electrode 20 and the cathode electrode 60 fall from the excited state to the ground state. Light emission is performed to display an image through the substrate 10.

1 and 2, reference numeral 70 denotes an encapsulation substrate, reference numeral 80 denotes a chip mounted on the substrate, and 90 denotes a polarizing plate.

In the display device having the above-described configuration, the present invention allows the separator 40 to absorb external light in order to prevent the bright room contrast from being lowered due to external light incident from the outside through the substrate 10.

To this end, the separator 40 is formed of a photosensitive material containing a black pigment.

Hereinafter, a method of manufacturing the organic light emitting display device including the separator 40 will be described.

First, a transparent conductive material is deposited on a substrate 10 formed using sodaime or hardened glass, and then patterned using a photolithograpy process and an etching process to form the anode electrode 20 having a stripe pattern. Form.

Here, ITO, IZO, or the like may be used as the transparent conductive material.

An insulating material is coated on the substrate 10 on which the anode electrode 20 is formed, and then patterned by a photolithography process to form an insulating film 30 exposing the light emitting region of the anode electrode 20.

Here, the insulating material may be coated by spin coating.

Thereafter, the photosensitive material including the black pigment is deposited on the substrate 10 and then patterned using a photolithography process to form the separator 40.

In this case, the separator 40 is formed in the non-light emitting region in a direction crossing the anode electrode 20 to distinguish the pixels, and may serve as a mask when the organic light emitting layer 50 and the cathode electrode 60 are deposited. To form an overhang structure.

After the separator 40 is formed, the organic emission layer 50 is formed on the substrate 10, and then the cathode electrode 60 is formed on the organic emission layer 50.

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.

In the passive organic light emitting diode display according to the exemplary embodiment described above, since the external light incident through the substrate is absorbed by the separator, the decrease in bright room contrast due to the external light reflection can be effectively prevented. Therefore, there is an effect which can improve bright room contrast.

In addition, by allowing the external light to be absorbed by the separator, there is an effect that can remove the additional process for separately forming the external light absorbing portion for absorbing the external light.

Claims (3)

Board; A first electrode formed on the substrate in a stripe pattern; An insulating film exposing the light emitting region of the first electrode; A separator stacked on the insulating film in a direction orthogonal to the first electrode; An organic light emitting layer stacked in a space between the separators in a direction orthogonal to the first electrode; And A second electrode stacked on the organic light emitting layer Including; The separator is formed of an overhang structure, the passive organic light emitting device is formed of a photosensitive material containing a black pigment. delete Forming a first electrode on one surface of the substrate in a stripe pattern; Forming an insulating film exposing the light emitting region of the first electrode; Forming a separator in a direction orthogonal to the first electrode; Forming an organic emission layer in a space between the separators in a direction orthogonal to the first electrode; And Forming a second electrode on the organic light emitting layer It includes, wherein forming the separator, Forming a photosensitive material including a black pigment to a predetermined thickness; And And patterning the photosensitive material into an overhang structure.

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