KR20030075387A - An organic electro-luminescence display and the manufacturing method thereof - Google Patents

Abstract

PURPOSE: An organic electro-luminescence display and a fabricating method thereof are provided to reduce the thickness of the organic electro-luminescence display by inserting an additional substrate including an organic electro-luminescent layer between two transparent glass substrates. CONSTITUTION: An organic electro-luminescence display includes the first substrate(10), the second substrate(20), and the third substrate(30). The first substrate(10) has the predetermined depth. The first transparent electrode is deposited on the first substrate(10). The second substrate(20) has the same as the size of the first substrate(10). The third substrate(30) is installed between the first substrate(10) and the second substrate(20). The third substrate(30) is formed with an organic electro-luminescent layer and the second electrode.

Description

Organic electroluminescent display and its manufacturing method

The present invention relates to an organic electroluminescent display and a method of manufacturing the same, and more particularly, to an organic electroluminescent display and a method of manufacturing the organic electroluminescent display, the work process is easy and reduced in thickness.

Flat panel display technology is being used for use in mobile and portable electronic devices, and the flat panel display market is still dominated by the technology of liquid crystal displays (LC-display).

The liquid crystal display, despite its low manufacturing potential, low electrical power consumption, low weight and low space requirements, is not self-luminous and thus easily read or identified only under optimal ambient light conditions. This drawback requires a backlight device that doubles the thickness of the flat panel display.

Accordingly, displays based on organic light emitting diodes (hereinafter referred to as organic ELs) (hereinafter referred to as organic electroluminescent displays) have emerged. The organic EL basically includes a hole layer for preventing the loss of electrons provided from the anode electrode, an electron layer for smooth injection of electrons provided from the cathode electrode, and a light emitting layer emitting light according to the R / G / B light emitting body. Layer; EML). The hole layer has a hole injection layer (HIL) and a hole transfer layer (HTL), and the electron layer has an electron injection layer (EIL) and an electron transfer layer (Electron Transfer Layer). ; ETL).

The injection layer and the transport layer of the electron layer and the hole layer are selectively configured according to the properties of the material. The light emitting layer functions to emit light, but also mainly to transport electrons or holes.

In the above organic EL, a transparent indium tin oxide (ITO) electrode (anode electrode) is placed on an upper surface of a substrate made of glass or film, and a hole injection layer (HIL) and a hole transport layer (HTL) are disposed on an upper surface of the ITO electrode. ), A light emitting layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) are sequentially formed, and then a metal electrode (cathode electrode) such as aluminum (Al) is deposited.

The organic EL display thus formed is surrounded by a capsule using glass or SUS, and an inert gas such as nitrogen or argon is filled at a constant pressure inside.

The organic EL display having such a structure emits light by compressing another new glass substrate 2 onto the glass substrate 1 as shown in FIG. 1, which is called a lower substrate of the two glass substrates 1 and 2. A portion of the inside of the glass substrate 1 that can be cut, and a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) It is a structure consisting of sequentially.

In the case of an organic EL display using such a cutting method, the process of cutting a certain portion of one glass substrate is not only very demanding, but also a hole injection layer (HIL) and a hole at the cut portion must be maintained at a certain thickness. A thickness limitation occurs in that the transport layer HTL, the light emitting layer EML, the electron transport layer ETL, and the electron injection layer EIL can be sequentially formed.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is to provide an organic electroluminescent display which can reduce a work process and overcome the limitation of thickness.

Another object of the present invention is to provide a method of manufacturing an organic electroluminescent display which can reduce the work process and overcomes the limitation of thickness.

1 is a view showing the structure of a conventional organic electroluminescent display,

2 is a cross-sectional view of FIG.

3 is a view showing the structure of an organic electroluminescent display according to an embodiment of the present invention;

4 is a cross-sectional view of FIG. 3.

※ Explanation of code for main part of drawing

1, 2: glass substrate 10: first glass substrate

20: second glass substrate 30: third substrate

In order to achieve the above object, an organic electroluminescent display according to a preferred embodiment of the present invention includes a transparent first substrate having a predetermined thickness on which a transparent first electrode is deposited; A transparent second substrate having a predetermined thickness having the same size as that of the first substrate; And a third substrate disposed between the first substrate and the second substrate and formed of an organic light emitting layer having a predetermined thickness and a second electrode.

A method of manufacturing an organic electroluminescent display according to an embodiment of the present invention includes a first process of depositing a transparent first electrode on a transparent first substrate having a predetermined thickness; And compressing the transparent second substrate having the same size as the first substrate with the first substrate, and embedding a third substrate having an organic light emitting layer and a second electrode having a predetermined thickness between the first substrate and the second substrate. It has a second process to make.

Hereinafter, an organic electroluminescent display and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a view showing the structure of an organic electroluminescent display according to an embodiment of the present invention.

The organic electroluminescent display of the present invention comprises: a transparent first glass substrate 10 having a predetermined thickness on which a transparent first electrode (ITO electrode or anode electrode; not shown) is deposited; A transparent second glass substrate 20 of a predetermined thickness having the same size as the first glass substrate 10; And a third substrate 30 provided between the first glass substrate 10 and the second glass substrate 20 and formed of an organic light emitting layer having a predetermined thickness and a second electrode (cathode electrode or metal electrode).

The organic light emitting layer may include a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL), and an electron injection layer (EIL). It is also composed of the light emitting layer (EML) and the major transport layer (HTL). In FIG. 2, the center portion of the third substrate 30 is shown as if it is perforated, but this shows that the third substrate 30 has a certain thickness, and the organic material of the predetermined thickness is substantially described above. The light emitting layer is formed at the center of the third substrate 30.

And since the 1st glass substrate 10 does not need a conventional cutting process, compared with the glass substrate 1 of FIG. 1, the thickness is reduced.

In the embodiment of the present invention, the organic light emitting layer and the second electrode are formed on the third substrate 30. If necessary, only the organic light emitting layer is formed on the third substrate 30, and the second electrode is the second electrode. It may be formed on the glass substrate 20.

Meanwhile, referring to the manufacturing process of the organic electroluminescent display of the present invention configured as described above, first, a transparent first electrode (ITO electrode or anode electrode; not shown) is sputtered onto a transparent first glass substrate 10 having a predetermined thickness. Evaporation). Then, the transparent second glass substrate 20 having the same size as the first glass substrate 10 is pressed with the first glass substrate 10, and the organic light emitting layer and the second electrode (cathode electrode or metal) having a predetermined thickness are pressed. The third substrate 30 having the electrode) is embedded between the first glass substrate 10 and the second glass substrate 20 and pressed.

Referring to the operation of the organic electroluminescent display according to the embodiment of the present invention manufactured as described above are as follows.

When a positive voltage is applied to the first electrode (ITO electrode) and a negative voltage is applied to the second electrode (cathode electrode, metal electrode), holes are injected from the first electrode. Electrons are injected from the second electrode and light is generated by recombination of electrons and holes in the organic light emitting layer of the third substrate 30. The generated light is emitted through the transparent first electrode and the first glass substrate 10.

As described in detail above, according to the present invention, unlike the conventional method of cutting the glass substrate to form the organic light emitting layer on the cut portion, an organic light emitting layer or the like is formed between two glass substrates having no cut portion. By manufacturing the organic electroluminescent display by inserting and compressing the substrate, there is an effect that not only facilitates the work process but also makes the thickness of the organic EL display thinner.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

Claims (2)

A transparent first substrate having a predetermined thickness on which the transparent first electrode is deposited; A transparent second substrate having a predetermined thickness having the same size as that of the first substrate; And An organic electroluminescent display, which is provided between the first substrate and the second substrate, and has a third substrate formed of an organic light emitting layer having a predetermined thickness and a second electrode. Depositing a transparent first electrode on a transparent first substrate having a predetermined thickness; And A second transparent substrate having the same size as the first substrate is pressed against the first substrate, and a third substrate having an organic light emitting layer and a second electrode having a predetermined thickness is embedded between the first substrate and the second substrate and pressed. A method of manufacturing an organic electroluminescent display, comprising the second process.