KR101890774B1 - Organic light emitting device - Google Patents

Organic light emitting device Download PDF

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Publication number
KR101890774B1
KR101890774B1 KR1020110143917A KR20110143917A KR101890774B1 KR 101890774 B1 KR101890774 B1 KR 101890774B1 KR 1020110143917 A KR1020110143917 A KR 1020110143917A KR 20110143917 A KR20110143917 A KR 20110143917A KR 101890774 B1 KR101890774 B1 KR 101890774B1
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layer
light emitting
formed
organic light
organic
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KR1020110143917A
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Korean (ko)
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KR20130075525A (en
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양원재
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엘지디스플레이 주식회사
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Abstract

An organic electroluminescent display device is disclosed.
An organic light emitting display according to an exemplary embodiment of the present invention includes a driving thin film transistor formed on a substrate, an organic light emitting device including a first electrode, a light emitting organic layer, and a second electrode sequentially formed on a substrate on which the driving thin film transistor is formed, A barrier coating layer positioned on the substrate on which the organic light emitting device is formed to block moisture and oxygen from penetrating into the organic light emitting device, a retardation film for retarding the phase of the light emitted from the organic light emitting device, A polarizing plate formed on the retardation film to prevent external light from being reflected, and a hard coating layer disposed on the polarizing plate to protect the polarizing plate from external physical forces.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device capable of reducing its thickness to enable a flexible implementation.

The image display device that realizes various information on the screen is a core technology of the information communication age and it is becoming thinner, lighter, more portable and higher performance. An organic light emitting display device for displaying an image by controlling the amount of light emitted from the organic light emitting layer by using a flat panel display capable of reducing weight and volume, which is a disadvantage of a cathode ray tube (CRT), has attracted attention.

The organic electroluminescence display device is a self-luminous device using a thin light emitting layer between electrodes, and has an advantage that it can be made thin like paper.

A general organic light emitting display has a structure in which a sub-pixel driver array and an organic electroluminescent array are formed on a substrate, and light emitted from the organic electroluminescent array of the organic electroluminescent array passes through the substrate or the barrier layer to display an image.

The organic light emitting device has deterioration due to internal factors such as deterioration of the electrode and the light emitting layer caused by oxygen, deterioration due to reaction between the light emitting layer and the interface, and deterioration easily due to external factors such as moisture, oxygen, ultraviolet rays, There are disadvantages that occur. Particularly, packaging of the organic light emitting display is very important because external oxygen and moisture have a serious effect on the lifetime of the device.

As a packaging method, there is a method of sealing a substrate on which an organic light emitting device is formed with a protective cap. Before the protective cap is sealed, a moisture absorbent is attached to an inner center portion of the protective cap to absorb moisture, . In order to prevent the moisture absorbent from falling on the organic material layer, a semi-permeable membrane may be attached to the back surface of the protective cap so that moisture, oxygen,

As described above, the packaging method using a protective cap such as a metal or glass for protecting the organic material layer of the organic light emitting element from oxygen and moisture requires an additional material such as an adhesive or a hygroscopic agent for packaging, have. In addition, the volume and thickness of the organic light emitting display device can be increased according to the formation of the protective cap, and the flexible cap is difficult to apply because the protective cap is made of glass.

In order to overcome this difficulty, a method of encapsulating a thin film barrier layer by another method of packaging an organic light emitting display device has been attempted. As the barrier layer, a polymer is formed on an inorganic insulating film or an inorganic insulating film Film is being used.

On the other hand, in the organic light emitting display device sealed with such a barrier layer, a polarizing plate may be formed on the barrier layer in order to ensure visibility by external light reflection. At this time, a first adhesive layer is formed between the barrier layer and the polarizing plate, and the barrier layer and the polarizing plate are fixed by the first adhesive layer.

In addition, a touch film is additionally formed on the upper part of the polarizing plate for a touch screen operation. A second adhesive layer is formed between the polarizer and the touch film, and the polarizer and the touch film are fixed by the second adhesive layer.

In addition, the organic light emitting display having the barrier layer, the polarizing plate, and the touch film has a protective layer for preventing the touch film from being damaged due to external physical impact or scratches. . A third adhesive layer is formed between the touch film and the protective layer, and the touch film and the protective layer are fixed by the third adhesive layer.

As described above, the barrier layer, the polarizing plate, the touch film, and the protective layer are sequentially formed on the substrate on which the organic light emitting device is formed by the plurality of adhesive layers, thereby increasing the overall thickness of the organic light emitting display device . As the thickness of the organic light emitting display increases, flexible implementation becomes difficult.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an organic electroluminescent display device capable of reducing the thickness by coating a thin film layer comprising an organic film and an inorganic film on the back surface of a retardation film, And a display device.

According to an aspect of the present invention, there is provided an organic light emitting display including: a driving thin film transistor formed on a substrate; a first electrode sequentially formed on the substrate on which the driving thin film transistor is formed; A barrier coating layer disposed on the substrate on which the organic light emitting device is formed to block moisture and oxygen from penetrating into the organic light emitting device; A polarizing plate formed on the retardation film to prevent external light from being reflected; and a hard coating layer (not shown) disposed on the polarizing plate to protect the polarizing plate from external physical forces Hard coating layer).

As described above, in the organic light emitting display according to the present invention, a barrier layer, a retardation film, a transparent electrode layer, and a polarizing plate are sequentially formed on a substrate on which an organic light emitting device is formed to reduce the overall thickness of the product, Implementation can be enabled.

1 is a cross-sectional view illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.
2 is a detailed view of the polarizer of FIG.
FIG. 3 is a view showing the barrier layer of FIG. 1. FIG.
4 is a cross-sectional view illustrating an organic light emitting display according to another embodiment of the present invention.

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

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

1, an organic light emitting display according to an embodiment of the present invention includes a substrate 101 on which a driving thin film transistor (TFT) and an organic light emitting diode (OLED) are formed, A barrier coating layer 120 adhered on a substrate 101 on which a driving thin film transistor TFT is formed, a retardation film 130 formed on the barrier coating layer 120, a conductive thin film layer 130 formed on the retardation film 130, (140).

The organic light emitting display according to an embodiment of the present invention further includes a polarizer 150 formed on the conductive thin film layer 140 and a hard coating layer 160 formed on the polarizer 150 do.

The gate insulating film 103, the gate electrode 104, the interlayer insulating film 105, and the interlayer insulating film 105 are formed on the substrate 101. In the case where the driving thin film transistor TFT is a top gate type thin film transistor, Source and drain electrodes 106 and 108 and a protective layer 107 are formed in this order.

The semiconductor layer 102 may be formed of polysilicon. In this case, a predetermined region may be doped with an impurity. Of course, the semiconductor layer 102 may be formed of amorphous silicon rather than polysilicon, or may be formed of various organic semiconductor materials such as pentacene.

When the semiconductor layer 102 is formed of polysilicon, amorphous silicon is formed and crystallized into polysilicon. Examples of the crystallization method include Lap Thermal Annealing (LTA), Methally Induced Lateral Crystallization (MILC), or SLS (Sequential Lateral Solidification) and the like can be applied.

The gate insulating layer 103 may be formed of an insulating material such as silicon oxide or silicon nitride, or may be formed of an insulating organic material or the like.

The gate electrode 104 may be formed of various conductive materials. For example, various modifications such as Mg, Al, Ni, Cr, Mo, W, MoW or Au are possible.

The interlayer insulating layer 105 may be formed of an insulating material such as silicon oxide or silicon nitride, or may be formed of an insulating organic material. The interlayer insulating layer 105 and the gate insulating layer 103 may be selectively removed to form a contact hole exposing the source and drain regions.

The source and drain electrodes 106 and 108 are formed as a single layer or a plurality of layers of material for the gate electrode 104 on the interlayer insulating layer 105 so that the contact holes are buried.

The protective layer 107 protects and flattens the driving thin film transistor (TFT). The protective layer 107 may be formed in various forms, such as organic materials such as BCB (benzocyclobutene) and acrylic, or inorganic materials such as SiNx, and may be formed of a single layer, Various variants are possible such as water.

The organic light emitting diode OLED includes a first electrode 110 formed on the protective layer 107 and a light emitting organic layer 112 including a light emitting layer formed on the first electrode 110 and a light emitting layer 112 And a second electrode 114 formed on the second electrode 114.

The light-emitting organic layer 112 is formed in the order of the hole-related layer, the light-emitting layer, and the electron-related layer stacked on the first electrode 112 in this order.

The first electrode 110 is electrically connected to the drain electrode 108 of the driving thin film transistor TFT through a contact hole. The first electrode 112 is formed of an opaque conductive material having a high reflectivity such as aluminum (Al) or the like.

The bank insulating film 115 is formed in the remaining region except for the light emitting region. Accordingly, the bank insulating layer 120 has a bank hole for exposing the first electrode 110 corresponding to the light emitting region.

The second electrode 114 is formed on the light emitting organic layer 112. The second electrode 114 is formed of a transparent conductive material such as ITO, thereby emitting light generated from the light emitting organic layer 112 to the upper portion of the second electrode 114.

The barrier coating layer 120 blocks penetration of moisture or oxygen into the organic light emitting diode OLED. For this, the barrier coating layer 120 may have a laminated structure of an inorganic film, an organic film and an inorganic film.

When the barrier coating layer 120 is a single layer of an inorganic film, the inorganic film may be composed of any one of aluminum oxide (AlxOy), silicon oxide (SiOx), and silicon nitride (SiNx).

When the barrier coating layer 120 has a laminated structure of an organic film and an inorganic film, the organic film is formed of a polymer material such as an acrylic resin, an epoxy resin, polyimide, or polyethylene, And serves as a buffer for relieving the stress between the layers that are different from the warping of the OLED display.

The barrier coating layer 120 is formed by coating a thin film on either the back surface or the top surface of the retardation film 130. When the barrier coating layer 120 is formed of an inorganic film, the material of the inorganic film is coated on the back surface of the retardation film 130. Similarly, when the barrier coating layer 120 has a laminated structure of an organic film and an inorganic film, the material of the inorganic film is coated on the back surface of the retardation film 130, and then the organic film is coated.

3, the barrier coating layer 120 may include first and second organic layers 120a and 120c and inorganic layers 120a and 120b disposed between the first and second organic layers 120a and 120c. 120b.

As described above, the first and second organic layers 120a and 120c are formed of a polymer material such as acrylic vertical, epoxy resin, polyimide, or polyethylene, and serve to prevent penetration of moisture or oxygen from the outside. do.

The retardation film 130 has a central axis at an angle of 45 degrees with the central axis of the polarizer 150 and delays the phase of the light emitted from the barrier coating layer 120 by? / 4. The retardation film 130 includes a polycarbonate series and has a phase difference of 138 to 148 nm.

The conductive thin film layer 140 is disposed on either the upper surface or the rear surface of the retardation film 130 and functions as an electrode for a touch sensor. The conductive thin film layer 140 may be formed of an oxide electrode such as ITO or IZO, or a metal such as Mg, Ag, and Yb. The conductive thin film layer 140 is coated on either the upper surface or the rear surface of the retardation film 130 by sputtering.

2, the polarizer 150 includes a polarizing layer 150c for polarizing incident light, first and second transparent electrodes 150a and 150b formed on both sides of the polarizing layer 150c to protect the polarizing layer 150c, Support layers 150b and 150d and pressure sensitive adhesive 150a (hereinafter, referred to as PSA) adhered to the lower portion of the first transparent support layer 150b.

The polarizing layer 150c is formed by adsorbing a halogen salt crystal such as iodine to a polyvinyl alcohol (PVA) film and then stretching the PVA film in a specific direction so that the iodine crystals are oriented in the stretching direction As shown in FIG.

The iodine crystal absorbs light incident in the first direction and transmits light incident in a second direction perpendicular to the first direction to achieve a polarization function.

The first and second transparent support layers 150b and 150d are films for supporting and protecting the PVA 150C. The constituent materials should be optically transparent, free of birefringence, heat resistant, So that the PVA 150c can physically support and protect the PVA 150c.

In addition, the surface should have a property of being vast and capable of satisfactorily contacting an adhesive or a pressure-sensitive adhesive. For example, an acetate resin such as triacetylcellulose (TAC), a polyester resin, a polyimide resin, Resins, acrylic resins, and polynorbornene-based resins.

Most preferably, a triacetylcellulose (TAC) film in which the surface is saponified with an alkali or the like is used in consideration of polarization characteristics and durability.

The polarizer 150 having such a configuration is a linear polarizer that polarizes external light incident from the outside and blocks external light reflected from the first electrode 110. At this time, the polarizer 150 may be fixed to the conductive thin film layer 140 by the second adhesive layer 145.

The second adhesive layer 145 may be formed of a thermosetting or naturally curing epoxy adhesive and may adhere the polarizer 150 to the conductive thin film layer 140.

The hard coating layer 160 is disposed on the polarizing plate 150 to protect the polarizing plate 150 and prevent the polarizing plate 150 from being damaged by external physical force. That is, the hard coating layer 160 is formed at the outermost portion of the organic light emitting display, and protects a plurality of layers sequentially formed below the polarizing plate 150 and the polarizing plate 150.

The hard coating layer 160 is coated on the circular plate 150 by sputtering.

The hard coating layer 160 and the conductive thin film layer 140 are coated on the upper part of the polarizing plate 150 and the upper part of the retardation film 130 by sputtering. In addition, the barrier coating layer 120 is formed on the lower surface of the retardation film 130, that is, the back surface thereof, by a sputtering method.

The hard coating layer 160, the conductive thin film layer 140 and the barrier coating layer 120 are formed on the upper part of the polarizer 150 of the film substrate, the upper part of the retardation film 130 and the lower part of the retardation film 130 by a sputterer Each coated with a thin film.

Accordingly, the organic light emitting display according to the present invention can reduce the thickness of a conventional organic light emitting display device in which a plurality of films are stacked using a plurality of adhesives, thereby enabling a flexible implementation.

4 is a view showing another embodiment of the organic light emitting display device of FIG.

4, the organic light emitting display according to another embodiment of the present invention includes a substrate 101 on which a driving thin film transistor (TFT) and an organic light emitting diode (OLED) are formed, A protective layer 280 for protecting the organic light emitting device OLED on a substrate 101 on which a driving thin film transistor TFT is formed, A barrier coating layer 220, a retardation film 230 formed on the barrier coating layer 220, and a conductive thin film layer 240 formed on the retardation film 230.

The organic light emitting display device according to an embodiment of the present invention further includes a polarizing plate 250 formed on the conductive thin film layer 240 and a hard coating layer 260 formed on the polarizing plate 250 do.

The barrier coating layer 220 blocks moisture or oxygen from penetrating the organic light emitting diode OLED. For this, the barrier coating layer 220 may have a laminated structure of an inorganic film, an organic film and an inorganic film.

The retardation film 230 has a central axis at an angle of 45 degrees with respect to the central axis of the polarizer 250 and delays the phase of the light emitted from the barrier coating layer 220 by? / 4. The retardation film 230 includes a polycarbonate series and has a retardation of 138 to 148 nm.

The conductive thin film layer 240 is disposed on the phase difference film 230 and functions as an electrode for a touch sensor. The conductive thin film layer 240 may be formed of an oxide electrode such as ITO or IZO, or a metal such as Mg, Ag, and Yb. The conductive thin film layer 240 is coated on the phase difference film 230 by sputtering.

The polarizer 250 is a linear polarizer that polarizes external light incident from the outside and blocks external light reflected from the first electrode 110. At this time, the polarizer 250 may be fixed to the conductive thin film layer 140 by the second adhesive layer 245.

The first and second adhesive layers 270 and 245 may be formed of thermosetting or natural curing epoxy based adhesives. The first adhesive layer 270 serves to attach the protective layer 280 to the organic light emitting diode OLED and the second adhesive layer 245 serves to attach the polarizer 250 to the conductive thin film layer 240 .

The hard coating layer 260 is disposed on the polarizing plate 250 to protect the polarizing plate 250 and prevent the polarizing plate 250 from being damaged by external physical force. That is, the hard coating layer 260 is formed at the outermost portion of the organic light emitting display device to protect a plurality of layers sequentially formed below the polarizing plate 250 and the polarizing plate 250.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes and modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

110: first electrode 112: light emitting organic layer
114: second electrode 120, 220: barrier coating layer
130, 230: retardation film 140, 240: conductive thin film layer
145, 245: second adhesive layer 150, 250: polarizer
160, 260: hard coating layer 270: first adhesive layer
280: protective layer

Claims (11)

  1. A driving thin film transistor formed on a substrate;
    An organic light emitting diode comprising a first electrode, a light emitting organic layer and a second electrode sequentially formed on a substrate on which the driving thin film transistor is formed;
    A retardation film positioned on the organic light emitting element and delaying a phase of light emitted from the organic light emitting element;
    A barrier coating layer coated on the back surface of the retardation film and blocking water and oxygen from penetrating into the organic light emitting device;
    A conductive thin film layer which functions as an electrode for a touch sensor and is coated on the upper surface of the retardation film;
    A polarizer disposed on the conductive thin film layer to prevent external light from being reflected; And
    And a hard coating layer coated on the upper surface of the polarizer and protecting the polarizer from external physical force,
    Wherein the polarizing plate coated with the hard coating layer and the retardation film coated with the barrier coating layer and the conductive thin film layer are adhered to each other by an adhesive layer,
    Wherein the adhesive layer is in contact with a back surface of the polarizing plate and an upper surface of the conductive thin film layer.
  2. delete
  3. The method according to claim 1,
    Wherein the barrier coating layer is a single layer structure of an inorganic film or a multilayer structure in which an inorganic film / an organic film is laminated.
  4. The method of claim 3,
    Wherein the inorganic film comprises aluminum oxide (AlxOy), silicon oxide (SiOx), or silicon nitride (SiNx).
  5. The method of claim 3,
    Wherein the organic layer comprises a polymer material such as acrylic resin, epoxy resin, polyimide, or polyethylene.
  6. delete
  7. The method according to claim 1,
    Wherein the conductive thin film layer is formed of an oxide electrode such as ITO or IZO or a metal such as Mg, Ag and Yb.
  8. The method according to claim 1,
    Wherein the polarizer is a linear polarizer.
  9. delete
  10. delete
  11. The method according to claim 1,
    And a protective layer formed on the substrate on which the organic light emitting device is formed to protect the organic light emitting device.
KR1020110143917A 2011-12-27 2011-12-27 Organic light emitting device KR101890774B1 (en)

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WO2015102150A1 (en) * 2014-01-03 2015-07-09 경북대학교 산학협력단 Sensory device, display device, and method for manufacturing same
US10353230B2 (en) 2014-02-21 2019-07-16 Lg Chem, Ltd. Electronic blackboard

Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2005316470A (en) 2004-04-20 2005-11-10 Sharp Corp Vision switching type display apparatus through additional light modulating lc part

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JP5484853B2 (en) * 2008-10-10 2014-05-07 株式会社半導体エネルギー研究所 A method for manufacturing a semiconductor device
KR20100063292A (en) * 2008-12-03 2010-06-11 엘지디스플레이 주식회사 Top emission type organic electro-luminescence device and method for fabricating of the same
KR101591334B1 (en) * 2009-11-03 2016-02-04 엘지디스플레이 주식회사 A touch panel type organic electroluminescent device

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Publication number Priority date Publication date Assignee Title
JP2005316470A (en) 2004-04-20 2005-11-10 Sharp Corp Vision switching type display apparatus through additional light modulating lc part

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