KR20160067544A - Organic light emitting diode display device and method of manufacturing the same - Google Patents

Abstract

The present invention discloses an organic light emitting diode display device. More specifically, the present invention relates to an organic light emitting diode display device, capable of ensuring the uniformity between pixels by minimizing the deviation between light emitting diodes fabricated through an ink-jet process. According to the embodiment, there can be provided the organic light emitting diode display device in which, as ink coated between openings of bank layers, which partition the pixel areas, in the ink-jet printing process flows into adjacent openings, the ink is uniformly spread through an entire area, so that the deviation in thickness between the organic light emitting layers is minimized, thereby uniformly forming the thickness between the pixels.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic electroluminescent device and an organic electroluminescent device,

The present invention relates to an organic electroluminescent device, and more particularly, to an organic electroluminescent device having uniformity between pixels by minimizing a deviation between light emitting diodes manufactured by an ink-jet process and a method of manufacturing the same.

BACKGROUND ART [0002] With the entry into the information age, information electronic display devices are rapidly developing, and various types of flat display devices have been continuously studied.

Such a flat panel display device includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic electroluminescent (Organic Light-Emitting Diode Display; OLED).

In particular, the light emitting diode included in the organic electroluminescent device has a high luminance and low operating voltage, and is self-luminous which emits light by itself. Therefore, the light emitting diode has a large contrast ratio and is easy to realize an ultra-thin display. In addition, the response time is as small as several microseconds (μs), and the moving image is easy to implement, and there is no limitation of the viewing angle, and it is stable even at a low temperature.

The light emitting diode includes an organic light emitting layer sandwiched between the opposing first and second electrodes, and emits light through a color corresponding to the material of the organic light emitting layer.

Accordingly, the organic light emitting layers of the plurality of light emitting diodes are formed by the same material using techniques such as FMM (fine metal mask) and inkjet printing.

The FMM method is a method of forming a pattern layer by preparing an evaporation mask including a fine pattern to be patterned and evaporating the material to a target area. The pattern accuracy is relatively high, but a separate mask is required, Which is disadvantageous to large-sized and large-sized.

The inkjet printing technique is a method of forming a pattern layer by discharging a liquid material to a target area with a droplet of several to several tens of picoseconds along a pattern using a plurality of fine nozzles and drying the discharged liquid material, There is an advantage in that the process cost is low because it does not require a separate mask and it is advantageous in large-scale.

However, since the ink jet printing technique uses a liquid material, the ejection amount of the liquid material through the ink nozzles is not constant every time, or the quantity actually discharged is smaller or larger than the set amount, which causes a disadvantage in that the uniformity of the pattern layer is low have.

That is, according to the inkjet printing technique, the uniformity of the pattern layer formed between the target regions is lowered. Particularly, when the organic light emitting layer of the light emitting diode is formed using the inkjet printing technique in the manufacturing process of the organic electroluminescent device, the uniformity of the thickness of the organic light emitting layer is reduced. Therefore, the light emitting diode corresponding to each pixel region of the display region has low uniformity As shown in Fig.

1, a conventional organic electroluminescent device 1 includes a bank layer 5 having a plurality of openings 4, as shown in FIG. 1, And an organic light emitting layer 6 is formed on the first electrode in the opening 4. [ The bank layer 5 is formed on the entire surface of the substrate to partition each pixel region, and the openings 4 are formed in a lattice shape corresponding to the pixel region. The organic light emitting layer 6 is formed in one direction in parallel with the emission colors of R, G, B, and W colors.

This organic light emitting layer 6 is formed by the above-described ink printing technique after the formation of the bank layer 5. A bank layer 5 having openings 4 is formed on a substrate including a first electrode and an organic material corresponding to R, G, B, and W colors is formed on the first electrode, Or inks made of an inorganic material are sequentially coated and cured.

According to such an ink printing technique, even if the ink application amount is precisely controlled, there is a difference in the amount of ink filled in the opening portion 4, resulting in a thickness variation of the organic light emitting layer 6. This thickness variation is nonuniformly distributed to 6 nm or less between the respective pixels. In addition, the ink in the opening 4 may not spread evenly, and a partial aggregation may occur.

FIG. 2A is a view showing an emission deviation according to a thickness variation of an organic light emitting layer in a conventional organic electroluminescent device, and FIG. 2B is a view showing an example in which organic ink aggregation occurs.

Referring to FIG. 2A, a luminance difference due to a thickness variation of an organic light emitting layer between an arbitrary first pixel region PX1 and a second pixel region PX2 in the organic electroluminescent device 1 can be confirmed. 2B illustrates a phenomenon in which the ink does not spread evenly over the entire area of the opening 6 due to the deviation of the ink printing technique and is aggregated at one end. It becomes a defective pixel. The above-mentioned phenomena are a main cause of degrading the quality of the organic electroluminescent device and shortening the lifetime.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve a problem caused by a thickness variation of an organic light emitting layer in an organic electroluminescent device manufactured using an ink printing technique.

In order to achieve the above object, an organic electroluminescent device according to a preferred embodiment of the present invention includes a substrate on which a plurality of pixel regions are defined, openings adjacent to a bank layer for partitioning the pixel regions, The organic light emitting diode according to the present invention is characterized in that the organic light emitting diode is manufactured by applying the ink jet printing technique to the thickness of the organic light emitting layer or the ink aggregation phenomenon. A method of manufacturing an organic electroluminescent device according to an embodiment of the present invention includes forming a plurality of pixel regions on a substrate and forming neighboring openings in a first or second By adding a step of forming a channel part connecting in the first direction and the second direction, ink injected into the opening part in the subsequent inkjet printing step is transferred to the channel part So that the thickness deviation and the ink aggregation phenomenon are improved.

The organic electroluminescent device according to the embodiment of the present invention spreads uniformly over the entire area between the openings of the bank layer for partitioning the pixel region and the ink applied during the ink printing process flows into the neighboring openings, The thickness of each pixel can be uniformly formed.

1 is a plan view showing the structure of an organic light emitting layer in a conventional organic electroluminescent device.
FIG. 2A is a view showing a light emission deviation according to a thickness variation of an organic light emitting layer in a conventional organic electroluminescent device.
FIG. 2B is a view showing an example in which organic ink aggregation occurs. FIG.
3 is a plan view of the entire structure of an organic electroluminescent device according to an embodiment of the present invention.
FIG. 4A is a plan view showing a pixel region and a bank layer structure of a portion A of FIG. 3 according to the first embodiment of the present invention.
4B is a sectional view taken along line IV-IV 'of FIG. 4A.
5 is a view illustrating a structure in which pixel regions of the same color according to the first embodiment of the present invention are arranged in the horizontal direction.
6A is a plan view of a pixel region and a bank layer structure according to a second embodiment of the present invention.
6B is a sectional view taken along the line VI-VI 'of FIG. 6A.
7A to 7E are cross-sectional views illustrating a method of manufacturing an organic electroluminescent device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the case where the word 'includes', 'includes', 'have', 'to be performed', etc. are used in the present specification, other parts may be added as long as '~ only' is not used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, an organic electroluminescent device according to a preferred embodiment of the present invention and a method of manufacturing the same will be described with reference to the drawings.

3 is a plan view of the entire structure of an organic electroluminescent device according to an embodiment of the present invention.

3, the organic electroluminescent device 100 of the present invention includes a display area A / A including a plurality of pixel areas PX in which an image is displayed, and a display area A / And a non-display area (N / A) which is an outer portion.

The display area A / A includes a plurality of pixel areas PX arranged in a matrix. Here, the plurality of pixel regions PX correspond to a plurality of light emitting diodes (not shown) emitting light of different colors, respectively. As a result, a plurality of light emitting diodes are selectively driven to selectively emit light in each pixel region PX, thereby realizing image display in the display region A / A.

Here, the display area A / A may be divided into a top emission type and a bottom emission type according to a light emission method of a light emitting diode. In the top emission type, light is emitted toward the front side of the organic electroluminescent device 100. Accordingly, among the two electrodes of the light emitting diode, the first electrode, which is the lower electrode, is made of an opaque conductive material, Transparent conductive material.

In the bottom emission type, as the light is emitted toward the back surface of the organic electroluminescent device 100, the first electrode is made of a transparent conductive material and the second electrode is made of an opaque conductive material. Hereinafter, the structure of the present invention will be described with reference to an organic electroluminescent device of a lower emission type.

In implementing a color image, the organic light emitting layer of the light emitting diode itself emits light of R, G, B, and W colors, or the light emitting diode emits only W light, So that a method of implementing the three primary colors can be applied.

The non-display area N / A forms an outer edge of the display area A / A, and is connected to the thin film transistor and the signal lines included in the pixel area to form a circuit pattern and a signal line for driving the non- .

Particularly, in the organic electroluminescent device according to the embodiment of the present invention, the bank layers that partition the pixel region PX on the display region A / A are connected to each other. Hereinafter, the pixel region PX The structure will be described in more detail through an enlarged view.

FIG. 4A is a plan view of the pixel region and the bank layer structure of the portion A of FIG. 3, and FIG. 4B is a cross-sectional view of the portion IV-IV 'of FIG. 4A.

4A and 4B, the organic electroluminescent device according to the first embodiment of the present invention includes a first substrate 101, an array pattern layer 110, a planarization layer 115, a bank layer 150, An organic light emitting layer 160, and a second substrate 190.

The first substrate 101 has a plurality of pixel regions R, G, B, and W arranged in a matrix corresponding to R, G, B, and W colors on the display region.

A plurality of pixel regions R, G, B and W for defining an image are defined on the first substrate 101 and light emitting diodes are selectively controlled for each pixel region R, Thereby forming an array pattern layer 110 to be driven. The array pattern layer 110 includes a plurality of signal wirings formed in the vertical and horizontal directions and one or more thin film transistors and capacitors (not shown) disposed at the intersections to control signals applied to the light emitting diodes .

The thin film transistor has a function of causing a current corresponding to the gradation of an image to flow in the light emitting diode corresponding to a control signal applied through a signal line. For this purpose, a first electrode 131 serving as an anode electrode of the light emitting diode, As shown in FIG.

A planarization layer 115 may be formed on the array pattern layer 110. The planarization layer 115 removes a step formed on the upper surface by the array pattern layer 110, thereby allowing the upper formed layers to be stably disposed.

A first electrode 131 is formed on the planarization layer 115 to contact the array pattern layer 110. The first electrode 131 is formed to correspond to each pixel region 160 and is formed between the openings 140 of the bank layer 150 so that the entire surface of the first electrode 131 is exposed by the openings 140, (110). The first electrode 131 serves as an anode electrode of the light emitting diode, and is made of a transparent conductive material such as ITO. A bank layer 150 is formed on the planarization layer 115 and the first electrode 131.

The bank layer 150 is formed over the entire surface of the substrate and the opening 140 is formed in a lattice pattern so that the first electrode 131 is exposed corresponding to each pixel region R, G, B, and W. The bank layer 150 is made of a hydrophobic resist material and the organic light emitting layer 160 is formed in the opening 140.

In particular, the bank layer 150 according to the embodiment of the present invention has a structure in which the openings 140 adjacent to each other in the vertical direction are connected to each other by the channel part 170. When the ink injected into the opening 140 during the manufacturing of the organic light emitting layer 160 to be described later is bundled or over a certain thickness before curing, the channel portion 170 may flow into the adjacent opening 140 It is important to note that

Therefore, even if there is a difference in the amount of ink to be injected into each opening 140, the thickness variation is minimized by spreading through the channel portion 170. Accordingly, inks to be injected into the openings 140 connected through the channel unit 170 should be applied to the organic or inorganic ink of the same color, and the organic light emitting layers 160 of the same color are arranged in the vertical direction The vertical strips are illustrated.

The width of the channel portion 170 should be at least equal to or smaller than the width of the opening 140 so as to serve as a passage for the ink. This is to minimize the surplus remaining in the channel unit 170. [

The organic light emitting layer 160 is formed inside the opening 140 of the bank layer 150 and is formed through inkjet printing. The organic light emitting layer 160 is formed on the organic common layer such as the hole injection layer HIL 161, the hole transport layer HTL 162, the electron transport layer ETL 164, and the electron injection layer EIL 165, 163) are interposed. Each of them has a characteristic of emitting red (R), green (G), blue (B) and white (W) light.

A second electrode 132 is formed on the front surface of the bank layer 150 including the electron injection layer 165 which is the uppermost portion of the organic light emitting layer 160. The second electrode 132 may be formed of aluminum (Al) or the like, which is opaque conductive material, and serves as a cathode electrode of the light emitting diode facing the first electrode 131.

The organic electroluminescent device thus constructed should be sealed through a protective film in order to prevent moisture permeation due to external moisture, and the second substrate 190 is provided so as to face the first substrate 101. A display device capable of displaying a desired image by various signals supplied therefrom can be manufactured by electrically connecting the driving device to the organic electroluminescent device having the second substrate 190.

In the first embodiment of the present invention, the channel portion 170 is formed between the adjacent openings 140 in the vertical direction. However, the connection direction of the openings 140 is not limited to a specific direction , And the organic light emitting layer 160. 5 illustrates a structure in which the pixel regions R, G, B, and W of the same color are arranged in the horizontal direction. As shown in FIG. 5, the organic light emitting layers 260 of the same color are arranged horizontally In the stripe structure, a structure in which the channel portion 270 of the bank layer 250 connects the openings 240 on the same horizontal line can be applied.

In the above embodiments, the organic light emitting layers 160 and 260 emit red, green, blue, and white light directly. In this embodiment, the openings of the bank layers 150 and 250 The organic light emitting layer emits only white light or light for only one color, and in the organic light emitting device in which the three primary colors are realized through separate color filters, the structure of the bank layer The openings can be configured in other forms.

FIG. 6A is a plan view showing a pixel region and a bank layer structure according to a second embodiment of the present invention, and FIG. 6B is a sectional view taken along line VI-VI 'of FIG. 6A.

6A and 6B, an organic electroluminescent device according to another embodiment of the present invention includes a first substrate 301, an array pattern layer 310, a planarization layer 315, a color filter layer 320, (350) and an organic light emitting layer (360).

The first substrate 301 has a plurality of pixel regions R, G, B, and W corresponding to R, G, B, and W colors defined on the display region.

An array pattern layer 310 for selectively controlling and driving the light emitting diodes corresponding to the plurality of pixel regions R, G, B, and W is formed on the first substrate 301, and a planarization layer 315 may be formed.

The R, G, and B color filter layers 320 are further formed on the planarization layer 315 as regions corresponding to the pixel regions R, G, B, and W. The color filter layer 320 converts light emitted from the light emitting diode into R, G, and B colors, and the converted light is emitted toward the lower side of the first substrate 301. The color filter layer 320 may be omitted in the pixel region W corresponding to white.

A first electrode 331 is formed on the planarization layer 315 in contact with the array pattern layer 310. The first electrode 331 is formed to correspond to each pixel region 360. A color filter layer 320 is disposed under the first electrode 331 and is connected to the lower array pattern layer 310. [

The first electrode 331 serves as an anode electrode of the light emitting diode, and may be formed of a transparent conductive material such as ITO.

A bank layer 350 is formed on the first electrode 331 and the planarization layer 315. The bank layer 350 corresponds to the pixel regions R, G, B, and W and has a plurality of lattice-like openings 340 that expose the second electrodes 331. The bank layer 350 is made of a hydrophobic resist material and the organic light emitting layer 360 is formed in the opening 340.

In particular, openings 340 adjacent in the vertical and horizontal directions are connected to the bank layer 350 according to another embodiment of the present invention by a channel part 370. That is, each of the channel units 370 connects all neighboring openings 340 regardless of the color of the pixel region of each of the openings 340.

The ink injected into the openings 340 during the production of the organic light emitting layer 360 is uniformly spread to the respective openings 340 by the channel portions 370 so that the amount of ink injected into the openings 140 Even if there is a difference, the thickness variation is minimized by spreading through the channel portion 270. As the ink flows into the neighboring openings 240, the ink injected into the openings 240 connected through the channel portions 270 should be applied with an ink of an organic or inorganic material of white or the same color. That is, the color of the organic light emitting layer 360 is the same, and a separate color filter is further provided, so that all the openings 240 can be connected regardless of the direction.

Due to the structure of the channel portion 270, the path of the ink spreading in the opening portion 240 doubles with respect to the above embodiment, so that the ink thickness deviation is more easily adjusted.

The organic light emitting layer 360 is formed inside the opening 240 of the bank layer 350 and is formed through inkjet printing. The organic light emitting layer 360 is formed on the organic common layer such as a hole injection layer (HIL) 361, a hole transport layer (HTL) 362, an electron transport layer (ETL) 364, and an electron injection layer (EIL) 363 are interposed. In particular, the light emitting layer 363 emits only one color in common to all of the pixel regions R, G, B, and W.

A second electrode 332 is formed on the front surface of the bank layer 350 including the electron injection layer 365 which is the uppermost portion of the organic light emitting layer 360. The second electrode 332 serves as a cathode electrode of the light emitting diode in opposition to the first electrode 331.

On the other hand, although not shown, a second substrate (not shown) for preventing moisture permeation is further provided opposite to the first substrate 301.

According to this structure, in the organic electroluminescent device according to the second embodiment of the present invention, the openings 240 of the bank layer 250 are both connected in the vertical and horizontal directions by the channel portions 270, The thickness variation due to the difference in the amount of the applied ink is improved.

Hereinafter, a method of manufacturing an organic electroluminescent device according to a preferred embodiment of the present invention will be described with reference to the drawings.

7A to 7B are cross-sectional views illustrating a method of manufacturing an organic electroluminescent device according to an embodiment of the present invention. In the following description, the manufacturing method of the organic electroluminescent device according to the first embodiment in which the channel portion is formed in one direction has been described, but the manufacturing method of the organic electroluminescent device according to the second embodiment is also similar, And forming a killer filter layer before forming the first electrode.

First, referring to FIG. 7a, a method of manufacturing an organic electroluminescent device according to an embodiment of the present invention includes preparing a substrate, forming an array pattern layer and a first electrode including a thin film transistor on the substrate, Forming a bank layer on the array pattern layer, the bank layer having a plurality of openings corresponding to the pixel regions and a channel portion connecting neighboring regions of the openings, the first electrodes being exposed; Forming a light emitting layer, and forming a second electrode in contact with the organic light emitting layer and covering the entire surface of the bank layer.

First, referring to FIG. 7A, a first substrate 101 made of plastic or glass is prepared, a thin film transistor and a capacitor are formed on a plurality of pixel regions defined in the first substrate 101, To form an array pattern layer 110 including a plurality of stripe patterns. Next, the planarization layer 115 of the substrate is formed on the array pattern layer 110, and the first electrode 131 is formed at a position corresponding to the pixel region. Here, when the organic electroluminescent device is a bottom emission type, a transparent conductive material such as ITO may be used for the first electrode 131, and an opaque conductive material such as aluminum (Al) may be used for the top emission type .

7B, the bank layer 150 is formed on the entire surface of the first substrate 101 on which the planarization layer 115 and the first electrode 131 are formed. The bank layer 150 can be formed using a hydrophobic resist material. The bank layer 150 may be formed by applying a resist on a patterned substrate (not shown) such that the first electrode 131 is exposed. At this time, the openings 140 are formed in the openings 140, The channel portion 170 is formed.

7C, an ink ejection device (not shown) used in the inkjet printing technique is disposed above the bank layer 150 having the opening portion 140 and the channel portion 170, and a nozzle nzl thereof is disposed. The first organic liquid material I 1 is discharged and dried for each of the openings 140 while moving the nozzle nzl to form the hole injection layer 161 do. Subsequently, the first organic liquid crystal material having hole transportability is discharged and dried on the hole injection layer 161 to form the hole transport layer 162. [

At this time, the discharged first organic liquid materials P1 may flow not only into the openings 140 but also into the channel portions 170 between the openings 140 (f).

7D, the second organic liquid material I2 is ejected and dried on the hole transport layer 162 while moving the nozzle nzl on the first substrate 101 to form the light emitting layer 163 do. At this time, the second organic liquid material I2, which is different for each of R, G, B, and W, is used for the light emitting layer 163, and therefore, it is subjected to the discharging and drying process for each pixel region according to each color. Here, since the channel portion 170 is formed only in the opening portion 140 between the pixel regions of the same color, it is not affected by the discharged second organic liquid material I2.

7E, an electron injecting layer 164 is formed on the light emitting layer 163 through a process of discharging and drying the third organic liquid material (I3) having electron injecting property and electron transporting property to the upper portion of the light emitting layer 163, And an electron transporting layer 165 are formed.

A second electrode (not shown) may be formed on the first substrate 101 to cover the entire surface of the first substrate 101, including the bank layer 150 and the electron transport layer 165, 2 substrate (not shown) are bonded together to complete the manufacturing process of the organic electroluminescent device.

As described above, according to the embodiment of the present invention, not only the opening portion for exposing the first electrode to the bank layer but also the channel portion for spreading the ink between the neighboring openings, The thickness variation of the light emitting layer can be reduced and the uniformity can be improved. Therefore, as the luminance characteristics between the light emitting diodes become uniform, the image quality can be improved and the lifetime of the organic electroluminescent device can be extended.

While a number of embodiments have been described in detail above, it should be construed as being illustrative of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

140: opening 150: bank layer
160: organic light emitting layer 170: channel part

Claims (9)

A liquid crystal display comprising: a substrate having a plurality of pixel regions arranged in a matrix form;
A first electrode provided in the pixel region;
A bank layer exposing the first electrode and having a plurality of openings corresponding to the pixel region;
An organic light emitting layer provided in the pixel region;
And a second electrode provided on the organic light emitting layer and covering the bank layer,
Wherein the bank layer comprises:
And a channel portion connecting the openings. The method according to claim 1,
The channel unit includes:
Wherein the opening is narrower than the opening. The method according to claim 1,
The organic light-
And emits light of the same color in the first direction. The method of claim 3,
The channel unit includes:
Wherein the organic light emitting device is provided between the openings arranged in parallel in the first direction. The method according to claim 1,
Wherein the array pattern layer includes a color filter corresponding to the three primary colors R, G, and B,
The organic light-
And emits white light. 6. The method of claim 5,
The channel unit includes:
Wherein the organic electroluminescent device is provided between the first direction or an opening disposed in parallel in a second direction perpendicular to the first direction. Preparing a substrate;
Forming a plurality of pixel regions including a thin film transistor on the substrate and arranged in a matrix form and a first electrode connected to the thin film transistor;
Forming a bank layer on the pixel region, the bank layer having a plurality of openings corresponding to the pixel regions and a channel portion connecting the neighboring regions of the openings, the first electrodes being exposed;
Forming an organic light emitting layer by applying ink on the first electrode; And
Forming a second electrode covering the entire surface of the bank layer on the organic light emitting layer
Wherein the organic electroluminescent device comprises a first electrode and a second electrode. 8. The method of claim 7,
Wherein the organic light emitting layer is formed by applying ink on the first electrode,
Wherein the organic light-emitting layer is formed using an ink-jet printing technique. Wherein forming the array pattern layer on the substrate comprises:
And forming color filters of three primary colors of R, G, and B corresponding to the pixel regions.

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