KR100407726B1 - Apparatus and method for detecting a defect in OELD by measuring leakage current between a separator pad and a cathode pad - Google Patents

Abstract

In the manufacturing process of the organic electroluminescent display device, by separating the separation barrier ribs to form a partition pad (pad), by measuring the resistance value between the partition pad and the cathode pad, the defect during the process in advance to eliminate the encapsulation (capsulation) The defect can be removed in the intermediate process without going to the process, and in the case of a weak short, power is supplied between the partition pad and the cathode pad to break the site where the weak short occurs, and then repair it again. The next step was to proceed.

Therefore, by measuring the resistance value between the separation barrier and the cathode pad to analyze the defect and repair (repair) it is possible to improve the yield.

Description

Apparatus and method for detecting a defect in OELD by measuring leakage current between a separator pad and a cathode pad}

The present invention is a next-generation image display device for an organic electroluminescent display (OELD) device, which is a next-generation display panel applicable to many fields such as portable terminals, display devices of special devices, and monitor TVs. More particularly, in the manufacturing process of the organic electroluminescent display device, an organic electroluminescence which measures the resistance value between the separation barrier and the cathode pad to analyze the defect and repair to help improve the yield The present invention relates to a separation barrier failure determining apparatus of a display element and a method thereof.

In general, a type of flat panel display (FPD) device is classified into a device using an organic material and a device using an inorganic material based on the material used.

Devices using inorganic materials include a plasma display panel using a photoluminescence (hereinafter referred to as PL) and a cathode using a photoluminescence (hereinafter referred to as PDP) and cathode luminescence (hereinafter referred to as CL). Field emission display devices (hereinafter referred to as FED) devices.

Display devices using organic materials include liquid crystal displays (hereinafter referred to as LCDs) and organic electroluminescent displays (hereinafter referred to as OELDs).

The OELD device has a response speed of more than 30,000 times faster than LCD devices which are currently widely used, which enables video to be realized, and also has the advantage of having a wide viewing angle and high luminance by emitting light by itself. The display device of the spotlight.

Such OELD devices are classified according to the type of organic material used, and there are a low molecular weight OELD device using a functional monomolecular organic material having a small molecular weight, and a high molecular weight OELD device using a high molecular weight organic polymer.

The OELD device typically includes a hole injection layer (hereinafter referred to as HIL), a hole transport layer (hereinafter referred to as HTL), an emission layer (hereinafter referred to as an EML), and an electron transport layer between the anode electrode and the cathode electrode. It is composed of a multilayer organic thin film including (Electron Transport Layer, hereinafter referred to as ETL).

1 shows the basic structure of the OELD device, and the characteristics of each layer constituting the device are as follows.

Reference numeral 10 is a transparent substrate, and the light emitted from the organic layer must be visible through the voltage applied between the anode and the cathode (transparent glass is used as the transparent substrate).

Reference numeral 20 denotes an anode electrode that supplies holes, and a transparent electrode such as indium tin oxide (ITO) through which light emitted from the organic layer is transmitted is used.

Reference numeral 30 should include an emission layer as an organic layer and may include a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, and the like.

Reference numeral 40 is a cathode electrode for supplying electrons. A metal having a low work function should be used to supply electrons smoothly.

The light emitting principle of the OELD device is that holes are injected from the external anode electrode 20, and electrons are injected from the cathode electrode 40 to emit light by recombination of the injected electrons and holes. If you look at the emission process of OELD step by step,

① Charges (electrons and holes) are injected from the anode electrode 20 and the cathode electrode 40 into the electron transport layer ETL and the hole transport layer HTL of the organic layer 30.

② The injected charge moves to the emission layer EML of the organic layer 30

③ An exciton is generated by recombination of electrons and holes in the emission layer EML of the organic layer 30.

④ The generated excitons move inside the emission layer EML of the organic layer 30.

⑤ It consists of the phenomenon of light emission from excitons.

In the above light emission process, electrons and holes are injected into the organic light emitting layer to be recombined, and electrons and holes which are not recombined disappear.

Referring to the manufacturing process of the OELD device briefly, as shown in FIG. 2, first, a pattern of a transparent electrode (ITO) 21, which may be used as an anode electrode, is formed, and an insulating film is formed by a photo process. Insulator 22 and a separator 23 for pattern formation of the cathode electrode are formed, and after masking with a metal mask (called a metal mask or a shadow mask) to deposit an organic film, an organic material is formed. And a cathode electrode is formed by depositing with an evaporator.

In such an OELD device, there is a panel that is caused by a failure (A) of the separation partition 23 of the substrate when the organic material and the cathode electrode are deposited by an evaporator. There is also a remarkable problem with dignity.

3A to 3C, when the portion A has one or more parts due to a mask defect, particles in the process, or a poor process condition, the cathode line (Cathod Line) and the cathode material (cathod material) on the separation barrier 23 is a short (contact) between each other, the screen quality due to current leakage occurs, if more than two parts occurs Short is generated between neighboring lines.

These phenomena occur more and more if the separation barrier 23 is formed in a mesh (mesh) form.

Therefore, a problem such as a short may occur in a specific portion of the panel of the organic EL display device, and the breakdown of the driver integrated device, which may occur when excessive current flows temporarily, may occur, as well as an abnormal phenomenon that changes during driving. There was a problem such that it could not be operated stably with respect to.

Accordingly, the present invention was devised to solve the above-mentioned problems, and by connecting the separating partitions to each other to make partition pads in one portion, and measuring the resistance between the partition pads and the cathode pads, SUMMARY OF THE INVENTION An object of the present invention is to provide a separation barrier failure determining apparatus of an organic light emitting display device in which defects are removed in advance so that defects can be removed in an intermediate process without proceeding to the encapsulation process.

In addition, the present invention is to supply power between the partition pad and the cathode pad in the case of a weak short (short) to repair the heat generated by the flow of current to the site where the short occurs (repair) so that the next process can proceed, It is an object of the present invention to provide a method for determining a separation barrier failure of an electroluminescent display device.

The separation barrier failure determination apparatus of the present invention organic electroluminescent display device for achieving the above object,

After forming a pattern of a transparent electrode (ITO) that can be used as an anode electrode, and forming a separator for pattern formation of an insulator and a cathode electrode by a photo process, an organic layer is formed. In the organic electroluminescent display device which is formed by depositing and forming a cathode electrode,

After forming all of the separation barrier (separator) to form a partition pad (pad), characterized in that the resistance measuring panel is formed so that the resistance value between the partition pad and the cathode pad can be measured.

In addition, the separation barrier failure determination method of the organic electroluminescent display device of the present invention for achieving the above object,

After forming a pattern of a transparent electrode (ITO) that can be used as an anode electrode, and forming a separator for pattern formation of an insulator and a cathode electrode by a photo process, an organic layer is formed. In the organic electroluminescent display device which is formed by depositing and forming a cathode electrode,

By measuring the resistance value between the partition pad and the cathode pad formed by connecting all the separator (separator),

When the resistance value is infinity, it is normal, and it is characterized in that the portion in which the resistance value is measured is determined as a shorted portion, i.

1 is a basic structural diagram of a general organic electroluminescent display device,

2 is an exemplary view showing a conventional manufacturing process,

3A to 3C are exemplary views illustrating a defective state of a separation partition wall according to a conventional manufacturing process.

3A is a cross-sectional view of a portion B-B of FIG. 2;

3B is an enlarged partial view of FIG. 2;

3C is a cross-sectional view illustrating a shorted state due to a failure of a partition wall;

Figure 4 is an exemplary view showing a manufacturing process of the separation barrier failure determination device of the organic electroluminescent display device according to the present invention,

5 is an exemplary view illustrating a separation barrier failure determination method of an organic electroluminescent display device according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10 transparent substrate 20 anode electrode

30 organic film 40 cathode electrode

21: transparent electrode (ITO) 22: insulating film (Insulator)

23: separation partition 24: cathode pad

25: bulkhead pad 26: resistance meter

A: defective part (shorted part)

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

The separation barrier failure determination apparatus of the organic electroluminescent display device according to the present invention forms a pattern of the transparent electrode 21 that can be used as the anode electrode 20, as shown in FIG. In the organic electroluminescent display device which forms the insulating film 22 and the isolation | separation partition 23 for pattern formation of a cathode electrode, and forms the cathode film 40 by depositing the organic film 30 by a process), After forming the partition pad 25 by connecting all the separating partitions 23, the resistance measurement panel is formed to measure the resistance value between the partition pad 25 and the cathode pad 24. do.

The failure determination apparatus of the separation partition of the present invention configured as described above forms a pattern of the transparent electrode 21 which can be used as the anode electrode 20, and the insulating film 22 and After forming the separation barrier rib 23 for pattern formation of the cathode electrode, all the lines of the separation barrier rib 23 are connected to each other to form a barrier pad 25 separately to deposit a cathode metal.

After the partition pad 25 is formed as described above, the resistance value between the partition pad 25 and the cathode pad 24 is measured using the resistance measuring device 26.

Infinity when the separation barrier 23 is normal, that is, when no short occurs, the barrier pad 25 and the cathode pad 24 are in an open state where resistance values cannot be measured. The resistance value of appears.

On the other hand, when the short (short) in the separation barrier 23, the barrier pad 25 and the cathode pad 24 is connected to form a closed circuit as a whole, the resistance value is shown so that the resistance meter 26 By measuring the resistance value it is possible to find the portion (A) where the short occurs.

That is, the defective part A of the separation partition 23 can be analyzed.

Meanwhile, when the defective portion A of the separation partition 23 is analyzed as described above, as shown in FIG. 5, when the power is applied to the defective portion A, the defective portion A is applied by the applied power. As current flows, heat is generated, and the shorted portion is cut off by the generated heat.

Therefore, the defective portion A can be repaired by applying power to the defective portion A as described above to allow a current to flow.

As described in detail above, in the separation barrier failure determining apparatus and method of the organic light emitting display device according to the present invention, when a short occurs in the separation barrier, a resistance value appears between the barrier pad and the cathode pad. By measuring the resistance value between the bulkhead pad and the cathode pad by using this method, the shortened part can be found and the defective part A of the separating partition can be analyzed, and the shorted part is cut off by applying power. It is possible to repair (repair), thereby improving the yield in the manufacturing process of the display device.

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 (3)

After forming a pattern of a transparent electrode (ITO) that can be used as an anode electrode, and forming a separator for pattern formation of an insulator and a cathode electrode by a photo process, an organic layer is formed. In the organic electroluminescent display device which is formed by depositing and forming a cathode electrode, After connecting all of the separation barrier (separator) to form a partition pad (pad), the organic electroluminescence, characterized in that the resistance measuring panel is formed to measure the resistance value between the partition pad and the cathode pad Determination of separation barrier failure of the display element. After forming a pattern of a transparent electrode (ITO) that can be used as an anode electrode, and forming a separator for pattern formation of an insulator and a cathode electrode by a photo process, an organic layer is formed. In the organic electroluminescent display device which is formed by depositing and forming a cathode electrode, A first step of measuring a resistance value between the partition pad and the cathode pad formed by connecting all of the separators; And When the resistance value is infinite, it is determined that the normal, and the portion of the resistance value is determined by the separation process of the separation barrier failure determination method of the organic electroluminescent display device comprising a second process. The method of claim 2, The method of claim 2, further comprising a third process of repairing the defective portion is broken by applying power to a portion determined to be defective in the second process.