KR100711880B1 - Organic light emitting display device - Google Patents

Abstract

An organic electroluminescent display device according to the present invention comprises: a substrate defined by a pixel region and a non-pixel region, wherein a plurality of organic electroluminescent elements are formed in the pixel region; A sealant applied to a non-pixel region of the substrate; A metal cap attached by the sealant with a predetermined interval spaced apart from the position corresponding to the substrate; Characterized in that the absorbent and the oxygen generating agent is formed in a laminated structure on the inner surface of the metal cap.

According to the present invention, by using an absorbent containing an oxygen generating material or a laminated structure of the absorbent and the oxygen generating agent to generate an appropriate amount of oxygen inside the bag through a water reaction, it is possible to prevent a pixel short defect due to oxygen consumption. There is an advantage that it can.

Description

Organic light emitting display device

1 is a cross-sectional view schematically illustrating a structure of a conventional organic light emitting display device.

2 is a cross-sectional view of an organic light emitting display device according to an embodiment of the present invention.

3 is a cross-sectional view of an organic light emitting display device according to another embodiment of the present invention.

4 is a view for explaining that oxygen is generated by an absorbent or oxygen generating agent containing an oxygen generating material of the organic light emitting display device according to the present invention;

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

20: substrate 21: metal cap

22: sealant 23: moisture absorbent containing oxygen generating material

24: TCP 25: printed circuit board

26: drive drive IC 33: moisture absorbent

37: oxygen generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display, and more particularly, to an organic electroluminescent display capable of preventing a pixel short defect due to oxygen consumption by forming a laminate structure of an absorbent and an oxygen generating agent inside the metal cap. .

In general, organic light emitting diodes inject electrons and holes into the light emitting layer from the electron injection electrodes and the hole injection electrodes, respectively, to inject the injected electrons. ) Is a device that emits light when the exciton, which is a combination of holes and holes, drops from the excited state to the ground state.

Due to this principle, unlike the conventional thin film liquid crystal display device, since a separate light source is not required, the volume and weight of the device can be reduced.

In addition, the organic EL device exhibits high quality panel characteristics (low power, high brightness, high reaction rate, low weight). Due to these characteristics, OLEDs are considered to be powerful next-generation displays that can be used in most electronic applications such as mobile communication terminals, CNS, PDA, Camcorder, Palm PC.

In addition, since the manufacturing process is simple, there is an advantage that can reduce the production cost much more than conventional LCD.

1 is a view schematically illustrating a structure of a conventional organic light emitting display device. As shown in FIG. 1, an organic light emitting display device includes a substrate 10 providing a pixel region and a non-pixel region, and a sealant such as an epoxy and disposed to face the substrate 10 for encapsulation. It consists of a metal cap (11) bonded to the substrate (10) by a sealant (12).

An organic light emitting diode is formed on the pixel area of the substrate 10. A moisture absorbent 13 is inserted between the substrate 10 and the metal cap 11 to prevent deterioration of the organic light emitting layer element from a gas caused by moisture and oxygen.

In addition, a printed circuit board (PCB) 15 for applying a signal to an organic light emitting element formed on the pixel region of the substrate 10, the printed circuit board 15, and the organic light emitting diode It further comprises a TCP (Tape Carrier Package) 14 which extends the signal wiring of the device, and a drive driver IC 16 of the organic light emitting device.

In the pixel area of the substrate, a plurality of light emitting devices connected in a matrix manner are formed between a scan line and a data line, and the light emitting devices include an anode electrode, a cathode electrode, and an anode electrode. And an organic thin film layer formed between the cathode electrode and including a hole transport layer, an organic light emitting layer, and an electron transport layer.

On the other hand, the light emitting device configured as described above is vulnerable to hydrogen and oxygen because it contains an organic material, and since the cathode electrode is formed of a metallic material, it is easily oxidized by moisture in the air, thereby deteriorating electrical characteristics and light emission characteristics. Therefore, in order to prevent this, moisture is penetrated from the outside by mounting a moisture absorbent in a powder form or by adhering it in a film form to a container made of a metal can or cup or a substrate such as glass or plastic, To block oxygen and hydrogen.

That is, an encapsulation process is performed to prevent the light emitting device from being exposed to moisture. The encapsulation process forms an absorbent on the encapsulation substrate, and is formed under an inert gas atmosphere such as nitrogen (N 2) or argon (Ar). The substrate 10 and the metal cap 11 are bonded to each other by the sealant 12.

However, in the encapsulation process of the organic EL device, a small amount of oxygen is introduced into the inert gas such as nitrogen to encapsulate the small amount of oxygen to prevent short defects between the pixels provided in the pixel area.

However, an excessive amount of oxygen is initially introduced during the encapsulation process, which may cause defects such as shrinkage of the pixel, so that an appropriate amount of implantation is required. The problem of generating a short occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide an organic electroluminescent display device capable of preventing pixel short defects due to oxygen consumption by forming a laminate structure of a moisture absorbent and an oxygen generating agent inside the metal cap.

In order to achieve the above object, an organic light emitting display device according to an embodiment of the present invention, a pixel region and a non-pixel region, a substrate having a plurality of organic electroluminescent elements are formed in the pixel region; A sealant applied to a non-pixel region of the substrate; A metal cap attached by the sealant with a predetermined interval spaced apart from the position corresponding to the substrate; It is provided inside the metal cap and characterized in that it comprises a moisture absorbent containing an oxygen generating material.

In addition, a drive driver IC for applying a signal to the organic electroluminescent element formed on the substrate; The printed circuit board may further include a printed circuit board disposed to correspond to one surface of the metal cap.

In addition, the oxygen generating material is selected from one of the peroxides of alkali metals and alkaline earth metals, it is composed of one or more selected from the manganese dioxide, activated carbon and catalase as peroxide decomposition catalyst, according to the particle size of the peroxide decomposition catalyst The amount of oxygen generated by controlling the area and the reaction rate in contact with the moisture in the bag is characterized in that the absorption of moisture and the generation of oxygen.

In addition, an organic light emitting display device according to another embodiment of the present invention includes a substrate defined by a pixel region and a non-pixel region, a plurality of organic electroluminescent elements are formed in the pixel region; A sealant applied to a non-pixel region of the substrate; A metal cap attached by the sealant with a predetermined interval spaced apart from the position corresponding to the substrate; Characterized in that the absorbent and the oxygen generating agent is formed in a laminated structure on the inner surface of the metal cap.

Here, the moisture absorbent is characterized in that it is implemented as a calcium film (Ca) or calcium oxide film (CaO).

In addition, the oxygen generating material is selected from one of the peroxides of alkali metals and alkaline earth metals, it is composed of one or more selected from the manganese dioxide, activated carbon and catalase as peroxide decomposition catalyst, according to the particle size of the peroxide decomposition catalyst The amount of oxygen generated by controlling the area and the reaction rate in contact with the moisture in the bag is characterized in that the absorption of moisture and the generation of oxygen.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. no.

2 is a view schematically illustrating a structure of an organic light emitting display device according to an embodiment of the present invention.

Referring to FIG. 2, an organic light emitting display device according to an exemplary embodiment of the present invention includes a substrate 20 defined by a pixel region and a non-pixel region, in which a plurality of organic electroluminescent elements are formed in the pixel region; A sealant 22 applied to a non-pixel region of the substrate 20; A metal cap (21) attached by the sealant (22) at predetermined intervals at a position corresponding to the substrate (20); It is configured to include a moisture absorbent 23 is provided on the inner surface of the metal cap 21 and contains an oxygen generating material.

The apparatus further includes a driving drive IC 26 for applying a signal to the organic light emitting diode formed on the substrate 20, and a printed circuit board 25 disposed to correspond to one surface of the metal cap 21.

In the pixel area of the substrate 20, a plurality of organic electroluminescent devices are formed in a matrix manner between a scan line and a data line, and the organic electroluminescent devices include an anode electrode and And an organic thin film layer formed between the cathode electrode and the anode electrode and the cathode electrode and including a hole transport layer, an organic light emitting layer, and an electron transport layer.

The metal cap 21 is disposed spaced apart from each other at a position corresponding to the substrate 20. In this case, the metal cap 21 is vulnerable to hydrogen and oxygen because the organic electroluminescent element formed in the pixel region of the substrate 20 contains organic matter, and the cathode is formed of a metal material, and thus the metal cap 21 is resistant to moisture in the air. In order to overcome the problem of being easily oxidized by the deterioration of the electrical characteristics and the light emission characteristics is a container manufactured in the form of a cap (cap) such as a metal material.

The metal cap 21 is provided to have a size overlapping with a portion of the pixel area and the non-pixel area of the substrate 20. The sealant 22 for sealing is applied along the periphery of the metal cap 21 corresponding to the non-pixel region of the substrate 20. That is, the substrate 20 is bonded through the metal cap 21 and the sealant 22 to which the moisture absorbent 23 is attached, thereby completing an encapsulated organic light emitting device.

The driving driver IC 26 applies a data signal and a scan signal to the organic light emitting diode. In addition, a TCP (Tape Carrier Package) 24, which extends signal wiring for applying a signal to the organic EL device, is connected to the periphery of the substrate 20.

The printed circuit board 25 is disposed to correspond to one surface of the metal cap 21 and is manufactured by attaching the driving driver IC 26 to the printed circuit board 25.

In general, the moisture absorbent 23 is provided to remove moisture that can penetrate inside the capsule, but in the embodiment of the present invention, the oxygen absorbent is contained in the moisture absorbent 23, thereby absorbing moisture and encapsulating at the same time. Oxygen is generated inside to maintain the amount of oxygen.

As a result, when the organic electroluminescent display is left in a panel state for a long time, a total amount of oxygen is consumed, thereby preventing a pixel short defect from occurring.

In this case, as the oxygen generating material, one of peroxides of alkali metals and alkaline earth metals is selected, and may be configured in addition to at least one selected from manganese dioxide, activated carbon and catalase as a peroxide decomposition catalyst.

In this case, by adjusting the particle diameter of the peroxide decomposition catalyst, by adjusting the area in contact with the moisture in the bag, and by controlling the reaction rate, it is possible to control the oxygen generation amount of the oxygen generating agent.

However, in the case of the absorbent containing the oxygen generating material as described above, the efficiency of the absorbent is slightly lowered because the absorbent absorbs moisture in the bag and maintains the amount of oxygen by generating oxygen in the bag. There is this.

3 is a diagram schematically illustrating a structure of an organic light emitting display device according to another embodiment of the present invention.

The embodiment shown in Figure 3 in the embodiment of Figure 2 absorbs the oxygen in the bag and the moisture absorbent to perform the role of absorbing moisture inside the bag in order to overcome the problem of the moisture absorbing and oxygen generation at the same time. Oxygen generator for generating and maintaining the amount of oxygen is formed in a laminated structure characterized in that provided on the inner surface of the metal cap.

3, an organic electroluminescent display according to another embodiment of the present invention is defined as a pixel region and a non-pixel region, and includes a substrate 20 having a plurality of organic electroluminescent elements formed in the pixel region. ; A sealant 22 applied to a non-pixel region of the substrate 20; A metal cap (21) attached by the sealant (22) at predetermined intervals at a position corresponding to the substrate (20); The inner surface of the metal cap 21 is configured to include a moisture absorbent 33 and the oxygen generator 37 formed in a laminated structure.

The apparatus further includes a driving drive IC 26 for applying a signal to the organic light emitting diode formed on the substrate 20, and a printed circuit board 25 disposed to correspond to one surface of the metal cap 21.

In the pixel area of the substrate 20, a plurality of organic electroluminescent devices connected in a matrix manner are formed between a scan line and a data line as in the embodiment described with reference to FIG. 2. The electroluminescent element is composed of an anode electrode and a cathode electrode, and an organic thin film layer formed between the anode electrode and the cathode electrode and including a hole transport layer, an organic light emitting layer, and an electron transport layer.

In addition, the metal cap 21 is disposed spaced apart from each other at a position corresponding to the substrate 20.

In this case, the metal cap 21 is vulnerable to hydrogen and oxygen because the organic electroluminescent element formed in the pixel region of the substrate 20 contains organic material, and the cathode is formed of a metal material, thereby preventing moisture from being in the air. In order to overcome the problem of being easily oxidized by the deterioration of the electrical characteristics and the light emission characteristics is a container manufactured in the form of a cap (cap) such as a metal material.

In addition, the metal cap 21 has a size overlapping with a portion of the pixel area and the non-pixel area of the substrate 20, and a peripheral portion of the metal cap 21 corresponding to the non-pixel area of the substrate 20. Apply sealant 22 for sealing along.

That is, the substrate 20 is bonded through the metal cap 21 and the sealant 22 to which the moisture absorbent and the oxygen generator of the laminated structure are attached, thereby completing the encapsulated organic light emitting device.

In addition, the driving driver IC 26 applies a data signal and a scan signal to the organic light emitting diode, and extends signal wiring around the substrate 20 to apply a signal to the organic light emitting diode. TCP (Tape Carrier Package) 24 is connected.

The printed circuit board 25 is disposed to correspond to one surface of the metal cap 21 and is manufactured by attaching the driving driver IC 26 to the printed circuit board 25.

In the embodiment of the present invention, the moisture absorbent 33 is provided to remove moisture that may penetrate into the bag, and is preferably implemented as a calcium film (Ca) or a calcium oxide film (CaO).

In addition, the oxygen generator 37 formed by being stacked on the upper or lower portion of the moisture absorbent 33 is provided to maintain the amount of oxygen by generating oxygen in the bag, the oxygen generator 37 is an alkali metal And peroxides of alkaline earth metals are selected, and may be configured in addition to at least one selected from manganese dioxide, activated carbon, and catalase as peroxide decomposition catalysts.

In particular, in the embodiment of the present invention by adjusting the particle diameter of the peroxide decomposition catalyst, by adjusting the area in contact with the moisture in the bag, by controlling the reaction rate, it is possible to control the oxygen generation amount of the oxygen generator 37 It is characterized by.

That is, through the embodiment shown in FIG. 3, when the organic electroluminescent display device is left in a panel state for a long time, the entire amount of oxygen is consumed, thereby preventing pixel short defects from occurring, and also absorbing moisture inside the bag. Since the role of generating oxygen and maintaining the amount of oxygen inside the bag is formed in a laminated structure through a separate absorbent and an oxygen generating agent, its efficiency is increased.

4 is a view for explaining that oxygen is generated by the moisture absorbent 23 or the oxygen generator 37 containing the oxygen generating material of the organic light emitting display according to the present invention.

Referring to FIG. 4, the oxygen absorbent 23 or the oxygen generator 37 containing the oxygen generating material is mounted in a powder form or adhered in a film form to the inside of the metal cap 21.

At this time, one of peroxides of alkali metals and alkaline earth metals is selected as an oxygen generating material constituting the moisture absorbent 23 and the oxygen generator 37, and thus, one kind selected from manganese dioxide, activated carbon and catalase as a peroxide decomposition catalyst. It can be comprised in addition to the above.

Here, in the process of encapsulating the metal cap 21, a small amount of oxygen is introduced into an inert gas such as nitrogen to encapsulate it, in order to prevent short defects between pixels provided in the pixel area.

However, in the conventional case, as described above, when oxygen is initially contained in an excessive amount of the encapsulation process, it may cause defects such as shrinkage of the pixel, so that an appropriate amount of implantation is required, but as time passes, the amount of oxygen in the encapsulation decreases, thereby reducing pixels through defect repair. The short prevention is not performed, causing a problem of generating a pixel short.

Accordingly, the present invention not only absorbs moisture by the moisture absorbent 23, but also generates oxygen in the bag through the oxygen generating material 37 formed in a laminated structure with the oxygen generating substance contained in the moisture absorbent 33 or the absorbent 33. By doing so, it is possible to prevent a short failure between the pixels provided on the pixel region.

In particular, in the embodiment of the present invention by adjusting the particle diameter of the peroxide decomposition catalyst, such as activated carbon contained in the oxygen generator, by adjusting the area in contact with moisture in the bag, by controlling the reaction rate, the oxygen of the oxygen generator It is characterized by the possibility of adjusting the amount of generation.

As a result, according to the present invention, oxygen is generated through a moisture reaction by an absorbent 23 containing an oxygen generating material or an oxygen generating agent 37 formed in a stacked structure on or under the absorbent, so that the pixel is left for a long time in a panel state. It is possible to prevent the occurrence of short defects.

As described above, an embodiment of the present invention has been disclosed through the detailed description and the drawings. The terms are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the organic light emitting display device according to the present invention generates an appropriate amount of oxygen through the water reaction by using a moisture absorbent containing an oxygen generating material or a laminated structure of an absorbent and an oxygen generating agent, There is an advantage that it is possible to prevent pixel short defects caused by oxygen consumption.

Claims (11)

A substrate defined by a pixel region and a non-pixel region, wherein a plurality of organic electroluminescent elements are formed in the pixel region; A sealant applied to a non-pixel region of the substrate; A metal cap attached by the sealant with a predetermined interval spaced apart from the position corresponding to the substrate; An organic light emitting display device, comprising: a moisture absorbent disposed inside the metal cap and containing an oxygen generating material. The method of claim 1, A drive drive IC for applying a signal to the organic electroluminescent element formed on the substrate; And a printed circuit board disposed to correspond to one surface of the metal cap. The method of claim 1, The oxygen generating material is selected from peroxides of alkali metals and alkaline earth metals, and the organic electroluminescent display device further comprising at least one selected from manganese dioxide, activated carbon, and catalase as a peroxide decomposition catalyst. The method of claim 3, wherein And the oxygen generating material absorbs moisture to generate oxygen. The method of claim 3, wherein And an amount of oxygen generated by controlling an area and a reaction rate in contact with moisture in the bag according to the particle size of the peroxide decomposition catalyst. A substrate defined by a pixel region and a non-pixel region, wherein a plurality of organic electroluminescent elements are formed in the pixel region; A sealant applied to a non-pixel region of the substrate; A metal cap attached by the sealant with a predetermined interval spaced apart from the position corresponding to the substrate; And an absorbent and an oxygen generating agent formed in a stacked structure on the inner surface of the metal cap. The method of claim 6, A drive drive IC for applying a signal to the organic electroluminescent element formed on the substrate; And a printed circuit board disposed to correspond to one surface of the metal cap. The method of claim 6, The moisture absorbent is formed of a calcium film (Ca) or a calcium oxide film (CaO). The method of claim 6, Wherein the oxygen generating agent is selected from peroxides of alkali metals and alkaline earth metals, and is added to at least one selected from manganese dioxide, activated carbon, and catalase as a peroxide decomposition catalyst. The method of claim 9, And the oxygen generating agent absorbs moisture to generate oxygen. The method of claim 9, And an amount of oxygen generated by controlling an area and a reaction rate in contact with moisture in the bag according to the particle size of the peroxide decomposition catalyst.

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