KR20150033406A - Organic electro-luminescent device and methode of fabricating the same - Google Patents

Abstract

Provided in the present invention are an organic electroluminescent device which comprises a first substrate having display area including multiple pixel areas defined; an organic electroluminescent diode formed on each pixel area on the first substrate; a second substrate formed to face the first substrate while being separated; a color filter layer formed on the inner surface of the second substrate; a black matrix formed on the boundary of each pixel area on the color filter layer; and an adhesive layer interposed between the first substrate and the second substrate, and to a method for fabricating the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent device and a method of fabricating the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent device, and more particularly, to an organic electroluminescent device capable of suppressing generation of light leakage and improving transmittance and a method of manufacturing the same.

An organic electroluminescent device, which is one of flat panel displays (FPDs), has high luminance and low operating voltage characteristics.

Since the organic electroluminescent device is a self-emissive type that emits light by itself, it has a large contrast ratio, can realize an ultra-thin display, can realize a moving image with a response time of several microseconds (μs) There is no limitation, it is stable even at a low temperature, and it is driven with a voltage of 5 V to 15 V direct current, so that it is easy to manufacture and design a drive circuit.

Accordingly, the organic electroluminescent device having the above-described advantages has recently been used in various IT devices such as a TV, a monitor, and a mobile phone.

Hereinafter, the basic structure of a general organic electroluminescent device will be described in more detail.

1 is a schematic cross-sectional view of one pixel region of a conventional organic electroluminescent device.

The organic electroluminescent device 1 comprises a substrate 10 for an organic electroluminescent device having an array element and an organic electroluminescent diode E and an opposing substrate 70 for encapsulation opposite thereto.

The array device includes a switching thin film transistor (not shown) connected to a gate and a data line, a driving thin film transistor DTr connected to the organic light emitting diode E, And the organic electroluminescent diode E comprises a first electrode 47 connected to the driving thin film transistor DTr and an organic light emitting layer 55 and a second electrode 58.

In the organic electroluminescent device 1 having such a configuration, light generated from the organic light emitting layer 55 is emitted toward the first electrode 47 or the second electrode 58 to display an image.

On the other hand, in the organic electroluminescent device 1 having such a configuration, an organic light emitting layer 55 (55a, 55b, 55c) made of different organic light emitting materials emitting red, green and blue light is formed for each pixel region Thereby realizing full-color images.

However, when the organic luminescent layer 55 is formed of different organic luminescent materials, there is a difference in lifetime of the organic luminescent materials themselves, and it is difficult to achieve a desired level of color purity in the image realization. The organic light emitting layer 55 must be formed.

That is, in the case of the organic light emitting material layer 55c emitting blue light in the organic light emitting layer 55, the lifetime of the organic light emitting material layer 55c is significantly shortened compared with the red and green organic light emitting layers 55a and 55b made of organic light emitting materials, If the blue organic light emitting layer 55c emitting blue light is provided, the lifetime of the blue organic light emitting layer 55c is the lifetime of the organic electroluminescent device 1, .

Further, when the organic light emitting layer 55 is configured to emit light of different colors, that is, red, green, and blue, an organic light emitting material that emits red, green, and blue light due to the difference of organic light emitting materials emitting red, The photolithography process, which is a process for general patterning, can not be used. In general, a shadow mask (not shown) having an opening region and a blocking region ), Or by a separate coating method using an ink-jet apparatus (not shown) or a nozzle apparatus (not shown).

However, in this case, the shadow mask (not shown) is usually made of a metal material, which may cause deflection or the like, which results in a large patterning error, and thus a large defective patterning can not be used at the time of manufacturing an organic light emitting device having a large area.

In addition, the individual coating method using an ink-jet apparatus (not shown) or a nozzle apparatus (not shown) also performs jetting using different organic light-emitting materials for different color light emission among neighboring pixel regions P, And the defect rate is increasing.

Therefore, in order to solve such a problem, an organic luminescent layer made of only the same glass luminescent material is formed on the entire display area, and a counter substrate for encapsulation other than the substrate on which the organic luminescent layer is formed is used as a color filter substrate An organic electroluminescent device capable of realizing a full-color display has been proposed.

FIG. 2 is a schematic cross-sectional view of an organic electroluminescent device including an organic electroluminescent layer made of a conventional organic electroluminescent material and a counter substrate for encapsulation having a color filter layer including red, green and blue color filter patterns to be.

  A driving thin film transistor DTr and a switching thin film transistor (not shown) are formed for each pixel region P on the first substrate 10 of the organic electroluminescence element 71 including the conventional color filter layer 85, And a first electrode 47 connected to the driving thin film transistor DTr is provided in each pixel region P and separated from the first electrode 47 by each pixel region P However, an organic light emitting layer 56 made of the same organic light emitting material is provided on the entire surface of the display region, and a second electrode 58 is provided on the entire surface of the display region, covering the organic light emitting layer 56.

The counter substrate 80 faces the first substrate 10 having such a configuration.

At this time, a black matrix 82 is provided on the inner surface of the counter substrate 80 in correspondence with the boundaries of the pixel regions P, and each pixel region P captured by the black matrix 82 A color filter layer 85 which overlaps the black matrix 82 and has a shape in which red, green and blue color filter patterns 85a, 85b and 85c are sequentially repeated for each pixel region P, An overcoat layer 87 covering the color filter layer 85 and made of a transparent organic insulating material and having a flat surface is provided.

The first substrate 10 and the opposing substrate 80 having the above-described configuration are bonded to each other with the adhesive layer 90 (transparent conductive layer) formed of a resin having transparency and adhesive property in a state where the second electrode 58 and the overcoat layer 87 face each other And an organic light emitting layer 56 and a color filter layer 85 made of one organic light emitting material by forming the first substrate 10 and the counter substrate 80 in a state in which the first substrate 10 and the counter substrate 80 are bonded together, 71).

However, the organic electroluminescent element 71 including the organic electroluminescent layer 56 and the color filter layer 85 of the conventional single organic electroluminescent material having such a structure is formed on the first substrate 10 and the opposing substrate 71 The adhesive layer 90 is shrunk in the process of being attached through the adhesive layer 90, thereby reducing the yield of the organic electroluminescent device.

The organic electroluminescent element 71 having the color filter layer 85 having the above-described structure has a color reversal phenomenon in which the displayed color changes depending on the positional change of the user looking at the display area thereof.

That is, the organic electroluminescent device 71 having the conventional color filter layer 85 includes an opposing substrate 80 on which a color filter layer 85 for full color implementation is formed, P) are formed on different substrates and are spaced apart from each other by a predetermined distance so that the organic light emitting layer 56 is formed on the organic light emitting layer 56 on the basis of one pixel region P The light having the luminance should be incident on the color filter patterns 85a, 85b and 85c corresponding to the color filter patterns 85a, 85b and 85c, which are incident on the color filter patterns 85a, 85b and 85c having the adjacent colors. It causes.

Therefore, the organic electroluminescent element 71 having the conventional color filter layer 85 having such a configuration has no problem when the user looks at the image from the front, but when the user looks at the image from the side with respect to the front A color reversal phenomenon is generated and displayed in a color other than the color in which the actual image is realized or a problem that the luminance characteristic is not well reflected and the contrast is degraded is displayed, .

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an organic electroluminescent display device having a structure in which a color filter layer is formed on an opposite substrate other than the substrate on which the organic light emitting layer is formed, Which is capable of suppressing or reducing the color reversal phenomenon, suppressing or reducing the color reversal phenomenon, and further suppressing the shrinking phenomenon of the adhesive layer, thereby improving the production yield, and a method for producing the organic electroluminescent device.

According to an aspect of the present invention, there is provided an organic electroluminescent device including a first substrate on which a display region having a plurality of pixel regions is defined; An organic light emitting diode formed in each pixel region on the first substrate; A second substrate facing the first substrate and spaced apart from the first substrate; A color filter layer formed on a side surface of the second substrate; A black matrix formed on the boundary of the pixel regions on the color filter layer; And an adhesive layer interposed between the first substrate and the second substrate.

At this time, an auxiliary pattern is formed between the color filter layer and the black matrix along the boundaries of the pixel regions.

An overcoat layer is formed on the entire surface of the display area between the color filter layer and the black matrix. At this time, the overcoat layer is formed with a surface modification layer on its surface by oxygen plasma treatment.

The organic light emitting diode may include a first electrode formed separately for each pixel region, an organic light emitting layer formed over the first electrode, and a second electrode formed over the entire surface of the display region over the organic light emitting layer, 1, a bank is formed on the first electrode so as to overlap a rim of the first electrode at a boundary of each pixel region, and the organic light emitting layer is formed in a region surrounded by the bank, And is formed on the entire surface of the display area.

In this case, the organic light emitting layer is formed of the same organic light emitting material over the entire display region, and the first electrode is formed to have the same thickness in each pixel region, so that the organic light emitting layer emits light having a single color Or each pixel region is formed to have a different thickness so that the organic light emitting layer emits different colors for each pixel region.

The color filter layer is formed by sequentially repeating color filter patterns of red, green, and blue for each pixel region, and the color filter layers are formed such that the red, green, and blue color filter patterns are adjacent to each other Or color filter patterns of two different colors are superimposed on one another.

A switching thin film transistor and a driving thin film transistor connected to the switching thin film transistor and the organic light emitting diode are formed in each pixel region on the first substrate.

The adhesive layer is made of a transparent resin and has a thickness of 5 to 8 탆 with respect to the center of each pixel region and is defined as a spacing distance between the second electrode and the black matrix formed on the upper portion of the bank The cell gap is characterized by having a value of 1 占 퐉 or more and a value smaller than the thickness of the adhesive layer.

A method of fabricating an organic electroluminescent device according to an embodiment of the present invention includes: forming an organic light emitting diode in each pixel region on a first substrate on which a display region having a plurality of pixel regions is defined; Forming a color filter layer on the inner surface of the second substrate facing the first substrate corresponding to the display area; Forming a black matrix on the boundary of each pixel region on the color filter layer; And adhering the first and second substrates with an adhesive layer interposed between the first substrate and the second substrate.

The forming of the organic light emitting diode may include forming a first electrode separated on the first substrate by the pixel region, forming an organic light emitting layer on the first electrode, And forming a second electrode on the entire surface of the display region. After forming the first electrode, the first electrode overlaps the first electrode and forms a bank at a boundary of each pixel region Wherein the organic light emitting layer is formed in a region surrounded by the bank and the second electrode covers the bank and is formed on the entire surface of the display region.

Forming an overcoat layer on the color filter layer over the display area before forming the black matrix after forming the color filter layer; and patterning the overcoat layer before forming the black matrix, And forming auxiliary patterns at the boundaries of the respective pixel regions.

In this case, the surface of the overcoat layer is modified by exposing the overcoat layer to oxygen plasma before or after forming the black matrix to form the surface modification layer.

The color filter layer is formed so that red, green, and blue color filter patterns are sequentially repeated for each pixel region, and the color filter layer is formed such that the red, green, and blue color filter patterns are adjacent to each other Or color filter patterns of two different colors are superimposed on one another.

The adhesive layer is made of a transparent resin and has a thickness of 5 to 8 탆 with respect to the central portion of each pixel region, and is defined as a spacing distance between the second electrode and the black matrix formed on the upper portion of the bank Is formed to have a cell gap of 1 占 퐉 or more and smaller than the thickness of the adhesive layer.

The organic electroluminescent device according to each of the embodiments of the present invention has a black matrix provided on the color filter layer to reduce the cell gap between the first substrate having the organic light emitting diode and the second substrate having the color filter layer, There is an effect of reducing.

Also, since the light leakage is suppressed or reduced, the color reversal phenomenon caused by the viewing angle change can be reduced, thereby reducing the color viewing angle defect.

Furthermore, since the overcoat layer covering the color filter layer is patterned or removed, a decrease in transmittance due to the overcoat is suppressed, thereby improving the transmittance of the conventional organic light emitting device having the overcoat layer.

Further, since the overcoat layer itself is patterned or omitted, or the surface is modified by oxygen plasma, there is an effect of suppressing the occurrence of shrinkage of the adhesive layer due to contact with the overcoat layer.

1 is a schematic cross-sectional view of one pixel region of a conventional organic electroluminescent device.
FIG. 2 is a schematic cross-sectional view of an organic electroluminescent device including an organic electroluminescent layer made of a conventional organic electroluminescent material and a counter substrate for encapsulation having a color filter layer including red, green and blue color filter patterns .
3 is a circuit diagram for one pixel of a general organic electroluminescent device.
4 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a first embodiment of the present invention.
5 is a sectional view of a driving thin film transistor in an organic electroluminescent device according to a modification of the first embodiment of the present invention.
6 is a sectional view of a driving thin film transistor in an organic electroluminescent device according to still another modification of the first embodiment of the present invention.
7 is a cross-sectional view schematically showing a part of a display region of an organic electroluminescent device including a conventional color filter layer as a comparative example according to the first embodiment of the present invention. FIG.
FIG. 8 is a graph showing the relationship between the luminance of the organic EL device according to the first embodiment of the present invention and the organic EL device having the conventional color filter layer as a comparative example, The graph of the upper part shows a graph corresponding to the comparative example and the graph of the lower part shows the graph of the lower part of the graph. A graph corresponding to the first embodiment of the present invention.
9 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a second embodiment of the present invention.
10 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a third embodiment of the present invention.
11 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a fourth embodiment of the present invention.
12A to 12F are cross-sectional views illustrating steps of manufacturing an organic electroluminescent device according to a first embodiment of the present invention.
13A and 13B are cross-sectional views illustrating steps of manufacturing a second substrate of an organic electroluminescent device according to a fourth embodiment of the present invention;

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

First, the structure and operation of the organic electroluminescent device will be briefly described with reference to FIG. 3 which is a circuit diagram for one pixel of the organic electroluminescent device.

As shown, a switching thin film transistor STr, a driving thin film transistor DTr, a storage capacitor StgC, and an organic light emitting diode E are provided in one pixel of the organic electroluminescent device have.

That is, a gate line GL is formed in a first direction, a data line DL is defined by defining a pixel region P in a second direction intersecting the first direction, and the data line DL And a power supply line PL for applying a power supply voltage is formed.

A switching thin film transistor STr is formed at the intersection of the data line DL and the gate line GL and a driving thin film transistor DTr electrically connected to the switching thin film transistor STr is formed have.

The first electrode, which is one terminal of the organic electroluminescent diode E, is connected to the drain electrode of the driving thin film transistor DTr, and the second electrode, which is the other terminal, is grounded. At this time, the power supply line (PL) transfers the power supply voltage to the organic light emitting diode (E).

A storage capacitor StgC is formed between the gate electrode and the source electrode of the driving thin film transistor DTr.

Therefore, when a signal is applied through the gate line GL, the switching thin film transistor STr is turned on and the signal of the data line DL is transmitted to the gate electrode of the driving thin film transistor DTr, The thin film transistor DTr is turned on so that light is output through the organic light emitting diode E.

At this time, when the driving thin film transistor DTr is turned on, the level of a current flowing from the power supply line PL to the organic light emitting diode E is determined, The storage capacitor StgC is capable of maintaining a constant gate voltage of the driving thin film transistor DTr when the switching thin film transistor STr is turned off, The level of the current flowing through the organic light emitting diode E can be kept constant until the next frame even if the switching thin film transistor STr is turned off.

4 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a first embodiment of the present invention. In this case, for convenience of description, a region where the driving thin film transistor DTr is formed is referred to as a driving region DA, and a region where switching thin film transistors (not shown) are formed in each pixel region P (Not shown).

As shown, the organic light emitting diode 101 according to the first embodiment of the present invention includes an organic light emitting diode (OLED) including an organic light emitting layer composed of a driving and switching thin film transistor (DTr, not shown) A color filter layer 173 and a black matrix 181 to provide a full color implementation and a second substrate for encapsulation of the organic electroluminescent diode E, And a substrate 170.

First, the structure of the first substrate 110 having the organic electroluminescent diode E including the driving and switching thin film transistor (DTr, not shown) and the organic light emitting layer 155 made of a single organic light emitting material will be described .

On the first substrate 110, a first region 113a in which a channel is formed is formed of pure polysilicon in each pixel region P, and a central portion of the pixel region P is doped with a high concentration of impurities on both sides of the first region 113a. And a second region 113b formed on the semiconductor layer 113. [

A buffer layer (not shown) made of an inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiNx) may be further formed on the entire surface between the semiconductor layer 113 and the first substrate 110.

The buffer layer (not shown) prevents the deterioration of the characteristics of the semiconductor layer 113 due to the release of alkali ions from the inside of the first substrate 110 when the semiconductor layer 113 is crystallized.

A gate insulating layer 116 is formed on the entire surface of the semiconductor layer 113 and a gate electrode 116 corresponding to the first region 113a of the semiconductor layer 113 is formed on the gate insulating layer 116. [ 120 are formed.

The gate insulating layer 116 is connected to a gate electrode (not shown) of a switching thin film transistor (not shown) and extends in one direction to form a gate wiring (not shown). At this time, the gate electrode 120 (not shown) and the gate wiring (not shown) constituting the driving and switching thin film transistor DTr (not shown) are formed of a metal material having a low resistance property such as aluminum (Al) AlNd), copper (Cu), copper alloy, molybdenum (Mo), molybdenum alloy (MoTi), or a combination of two or more materials.

An interlayer insulating film 123 is formed on the entire surface of the gate electrode 120 (not shown) and the gate wiring (not shown). The interlayer insulating layer 123 and the gate insulating layer 116 under the semiconductor layer contact hole 125 expose the second regions 113b located on both sides of the first region 113a .

Next, a data line (not shown) is formed on the interlayer insulating layer 123 including the semiconductor layer contact hole 125 to cross the gate line (not shown) and defining the pixel regions P, respectively.

The first region 113b and the second region 113b are separated from each other in the driving region DA and the switching region (not shown) above the interlayer insulating layer 123 and are exposed through the semiconductor layer contact hole 125, And drain electrodes 133 and 136 are formed.

A semiconductor layer 113 including the source and drain electrodes 133 and 136 and a second region 113b contacting the electrodes 133 and 136 and a gate electrode The insulating film 116 and the gate electrode 120 constitute a driving thin film transistor DTr and a switching thin film transistor (not shown), respectively.

The source and drain electrodes 133 and 136 spaced apart from the data line 130 may also be formed of a metal material having low resistance characteristics such as aluminum (Al), aluminum alloy (AlNd), copper (Cu), copper alloy, molybdenum (Mo), molybdenum alloy (MoTi), or a single layer or a multilayer structure.

The switching thin film transistor (not shown) is electrically connected to the driving thin film transistor DTr, gate wiring (not shown) and data wiring (not shown), and the data wiring (not shown) Is connected to a source electrode (not shown) of a transistor (not shown), and the driving thin film transistor DTr is connected to the power supply wiring (not shown) and the organic light emitting diode E.

In the organic EL device 101 according to the first embodiment of the present invention, the driving thin film transistor DTr and the switching thin film transistor (not shown) have a polysilicon semiconductor layer 113 and a top gate type The driving and switching thin film transistor (DTr) (not shown) is an example of the driving thin film transistor (FIG. 5) ) And 6 (a cross-sectional view of a driving thin film transistor in an organic electroluminescent device according to still another modification of the first embodiment of the present invention), an amorphous silicon semiconductor layer (220 in FIG. 5) or an oxide Or a bottom gate type having a semiconductor layer (320 of FIG. 6) made of a semiconductor material.

5, the gate electrode 215, the gate insulating film 218, and the active layer 220a of pure amorphous silicon are spaced apart from each other, A semiconductor layer 220 composed of an ohmic contact layer 220b of impurity amorphous silicon and source and drain electrodes 233 and 236 spaced from each other or having a stacked structure of gate electrodes The oxide semiconductor layer 320, the etch stopper 322 and the source stopper 322 which are spaced apart from each other on the oxide semiconductor layer 320 and are in contact with the oxide semiconductor layer 320, Electrodes 333 and 336 are stacked.

In the case of the first substrate (210 in Fig. 5, 310 in Fig. 6) on which the bottom gate type driving and switching thin film transistor DTr (not shown) is formed, the gate wiring (not shown) (Not shown) of the switching thin film transistor (not shown) is formed on the same layer on which the first electrode 215 and the second electrode 315 of FIG. 6 are formed, And is connected to the source electrode (not shown) on the same layer where a source electrode (not shown) is formed.

4, power wiring (not shown) is formed on the same layer on which the gate wiring (not shown) is formed or on the same layer where the data wiring 130 is formed. And is connected to one electrode of the driving thin film transistor DTr.

In addition, a protective layer 140 is formed on the entire surface of the first substrate 110 above the driving and switching thin film transistor DTr (not shown). A drain contact hole 143 is formed in the passivation layer 140 to expose the drain electrode 136 of the driving TFT DTr.

The protective layer 140 having the drain contact hole 143 is in contact with the drain electrode 136 of the driving thin film transistor DTr through the drain contact hole 143, A first electrode 147 is formed.

The first electrode 147 has a bilayer structure, the upper layer 147b serves as an anode electrode, and the lower layer 147a serves as a reflector.

The upper layer 147b of the first electrode 147 may be formed of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) having a relatively large work function value to serve as an anode electrode. And the lower layer 147a of the first electrode 147 is formed of a metal material having excellent reflection efficiency, for example, aluminum (Al) or silver (Ag) The light emitted from the organic light emitting layer 155 is reflected upward and recycled, thereby improving the luminous efficiency.

The organic electroluminescent device according to the first embodiment of the present invention is characterized in that the light emitted from the organic electroluminescent layer 155 passes through the color filter layer 173, The light emitted from the first electrode 110 toward the first substrate 110 is substantially not felt by the user and disappears. Therefore, in order to improve the brightness characteristics by recycling the light and to simplify the manufacturing process, the first electrode 147 Layer structure including a lower layer 147a made of a metal material having excellent reflection ability.

Next, as described above, the bank 150 is formed on the boundary of each pixel region P over the protective layer 140, overlapping the edge of the first electrode 147 having a bilayer structure and serving as an anode electrode .

At this time, the bank 150 may be formed of an organic insulating material, for example, polyimide, or may be formed of an organic material such as a black resin, for example, black.

On the other hand, an organic light emitting layer 155 is formed in each pixel region P surrounded by the bank 150, which is formed of the same organic light emitting material over the first electrode 147 as to the entire display area AA .

A second electrode 158 is formed on the organic light emitting layer 155 to serve as a cathode electrode on the entire surface of the display area AA and further to maintain the light transmitting property.

That is, the second electrode 158 may be formed of a metal material having a relatively low work function value such as aluminum (Al), aluminum alloy (AlNd), silver (Ag), magnesium (Mg) Au, and an aluminum magnesium alloy (AlMg). Further, the organic electroluminescent device 101 is driven by the top emission type of the organic electroluminescent device 101 according to the first embodiment of the present invention, The electrode 158 is about 10 to 200 ANGSTROM so that light can be transmitted smoothly and transmittance can be maintained.

The second electrode 158 may be formed of a transparent conductive material having a conductive property without deteriorating the translucency property in order to suppress the increase of the internal sheet resistance due to the thinness of the second electrode 158 and to improve the sheet resistance characteristic. (Not shown) may be further provided to achieve a double layer structure.

Alternatively, an auxiliary wiring (not shown) made of a metal material having a low resistance property and contacting the second electrode 158 at the boundary of the pixel 150 corresponding to the bank 150 above the second electrode 158 ) Can be further provided.

The first electrode 147, the organic light emitting layer 155, and the second electrode 158, which are sequentially stacked on the first substrate 110, form an organic light emitting diode E.

Although not shown, a transparent inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiO ₂ ) is formed on the second electrode 158 or on the auxiliary wiring (not shown) when the auxiliary wiring (Not shown) made of silicon nitride (SiNx) is further provided to prevent penetration of moisture or oxygen into the organic electroluminescent diode (not shown). At this time, the protective layer (not shown) may have a single layer structure or may be formed by alternately depositing different inorganic insulating materials, that is, silicon oxide (SiO ₂ ) and silicon nitride (SiNx).

Although not shown in the figure, the first electrode 147 and the organic emission layer 155 are formed between the organic emission layer 155 and the second electrode 158, and the organic emission layer 155 is formed between the first electrode 147 and the organic emission layer 155, A first luminescence compensation layer (not shown) and a second luminescence compensation layer (not shown) having a multilayer structure may be further formed.

At this time, the first emission compensation layer (not shown) of a plurality of layers is sequentially stacked from the first electrode 147 to the top thereof, and may be a hole injection layer and a hole transporting layer, The second emission compensation layer (not shown) may be sequentially stacked on the organic emission layer 155 and may include an electron transporting layer and an electron injection layer.

The organic light emitting diode E having the above-described configuration emits white light irrespective of each pixel region P, and the white light from the first substrate 110 provided with the organic light emitting diode E Passes through the color filter layer 173 provided on the second substrate 170 positioned on the top of the second substrate 170, and realizes full color.

However, even if the organic light emitting layer 158 made of the same organic light emitting material is formed in each pixel region P on the entire surface of the display region AA as described above, It is possible.

That is, the organic light emitting layer 158 made of one same organic light emitting material emits the same white light regardless of the pixel region P in the display region AA, or the second substrate 170 (Red, green and blue) color filter patterns 173a, 173b, and 173c provided in the color filters 173a, 173b, and 173c.

The thickness of the upper layer 147b made of a transparent conductive material among the first electrodes 147 of the double layer structure provided in each pixel region P is made equal in all the pixel regions P, The first electrode 147 is formed to have the same thickness with respect to the first electrode 147. The organic light emitting layer 158 made of the same organic light emitting material emits white light, Even if the organic light emitting layer 155 is formed of the same organic light emitting material in all the pixel regions P by the micro cavity effect in the case where the thickness is different for each pixel region P, It is possible to emit light having a main wavelength band, that is, lights of different colors.

In this case, when the thickness of the upper layer 147b of the first electrode 147 is different for each pixel region P so that the organic light emitting layer 155 made of the same organic light emitting material emits light of different colors, The organic light emitting layer 155 formed in each pixel region P is formed in correspondence to the pixel region P in which the organic light emitting layer 155 is formed and the color filter pattern 173 of the color filter layer 173 provided on the second substrate 170 It is preferable to emit light of the same color as the colors of the light emitting portions 173a, 173b, and 173c.

Meanwhile, if the organic light emitting layer 155 is made of the same organic light emitting material but emits red, green, and blue light, full color can be realized without using a separate color filter layer 173 on the second substrate 170 Color reproduction due to red, green and blue light emission of the organic light emitting layer 155 realized by the microcurve effect is smaller than the minimum value required as a display device for realizing a full color, Other general display devices implementing full color, for example, liquid crystal display devices or organic electroluminescent devices comprising organic electroluminescent layers (55 in FIG. 1) made of different organic electroluminescent materials and emitting red, green and blue respectively 1).

Therefore, the organic EL device 101 according to the first embodiment of the present invention having the above-described configuration requires a separate color filter layer 173 so that the color reproduction rate is similar to that of a general full color display device will be.

Meanwhile, in the organic electroluminescent device 101 according to the first embodiment of the present invention, the structure of the second substrate 170 facing the first substrate 110 having the above-described configuration will be described. 2 substrate 170 is provided with a color filter layer 173 on the entire surface of the display area AA.

At this time, the color filter layer 173 is formed such that the red, green, and blue color filter patterns 173a, 173b, and 173c are sequentially repeated for the pixel regions P.

Next, the upper portion of the color filter layer 173 (the upper portion of the color filter layer is the direction in which the first substrate 110 is positioned with respect to the second substrate 170) corresponds to the boundary of each pixel region P An auxiliary pattern 178 made of an organic insulating material is provided.

The auxiliary pattern 178 formed corresponding to the boundary of each pixel region P is the same material as the material forming the overcoat layer of the conventional color filter substrate for a liquid crystal display device, The pixel region 173 is not formed on the entire surface of the display region AA but is patterned and formed only in correspondence with the boundary of each pixel region P. [

A black matrix 181 is formed on the auxiliary pattern 178 in correspondence with the boundaries of the respective pixel regions P.

 Therefore, the second substrate 170 having the color filter layer 173 in the organic electroluminescent device 101 according to the first embodiment of the present invention has the same structure as that of the conventional color filter substrate for a liquid crystal display (80 in Fig. 2) of the organic electroluminescence device (71 in Fig. 2) including the conventional color filter layer (85 in Fig. 2).

That is, a color filter substrate for a general liquid crystal display device or a second substrate (80 in Fig. 2) of an organic electroluminescent device (71 in Fig. 2) including a conventional color filter layer (85 in Fig. 2) A blue matrix 82 (FIG. 2) is provided at the boundary of the pixel region P and overlaps with the black matrix 82 (FIG. 2) (85 in Fig. 2) in which the color filter layers (85a, 85b and 85c in Fig. 2) are successively repeated and an overcoat layer (85 in Fig. 87 of FIG. 2).

On the other hand, the second substrate 170 of the organic electroluminescent device 101 according to the first embodiment of the present invention is in contact with the inner surface of the second substrate 170, and the red, green, and blue color filter patterns The auxiliary pattern 178 is provided on the color filter layer 173 in correspondence with the boundary of each pixel region P and the color filter layer 173 is formed on the color filter layer 173, The black matrix 181 is formed on the border of each pixel region P on the auxiliary pattern 178 so that the black matrix 181 is provided on the uppermost portion of the second substrate 170 Feature.

Therefore, the organic electroluminescent device 101 according to the first embodiment of the present invention includes a constituent element such as a second electrode 158 formed on the top of the bank 150 implemented on the first substrate 110 (Not shown) when a protective layer (not shown) is provided on the first electrode 110 and the black matrix 181 provided on the second substrate 170, d1) is remarkably reduced compared to the organic electroluminescent device having the structure including the conventional color filter layer (71 of FIG. 2), thereby suppressing the light leakage and reducing the defects of the color viewing angle.

Next, when a second electrode (or a protective film is provided on the second electrode 110) provided on the first substrate 110, more precisely between the first and second substrates 110 and 170 having the above- Between the black matrix 181 provided on the second substrate 170 and the color filter layer 173 exposed to the outside of the black matrix 181 and a transparent resin material, Since the adhesive layer 190 made of epoxy is formed on the entire surface of the display area AA and the first and second substrates 110 and 170 are held together by the adhesive layer 190, Thereby forming the organic EL device 101 according to the first embodiment.

A comparison between the organic electroluminescent device 101 according to the first embodiment of the present invention and the organic electroluminescent device 71 having the conventional color filter layer (FIG. 2) shows that the conventional organic electroluminescent device having the color filter layer 2), the cell gap (d in FIG. 2) is set to be equal to the thickness of the adhesive layer (90 in FIG. 2) and the thickness of the overcoat layer (87 in Fig. 2) and the thickness of the color filter layer (85 in Fig. 2) superimposed on the black matrix (82 in Fig. 2).

However, in the organic EL device according to the first embodiment of the present invention, the black matrix 181 is provided at the uppermost portion of the inner surface of the second substrate 170, Only the thickness of the adhesive layer 190 interposed between the black matrix 181 and the black matrix 181 is 1 μm or more and smaller than the thickness (5 to 8 μm) of the adhesive layer.

The adhesive layer 190 is formed to have a thickness of 5 to 8 μm with respect to the center of each pixel region P in order to maintain stable adhesion between the first and second substrates 110 and 170 The adhesive layer 190 has a thickness smaller than that of the central portion of each pixel region P corresponding to a portion having a stepped portion compared to other regions such as the bank 150 due to the nature of the resin.

Therefore, in the organic electroluminescent device 101 according to the first embodiment of the present invention, the black matrix 181 is located at the top of the inner surface of the second substrate 170, The thickness of the adhesive layer 190 formed on the portion corresponding to the bank 150 becomes substantially smaller than the conventional one.

The light emitted from the organic light emitting layer 155 provided on one of the pixel regions P of the first substrate 110 may be emitted from the organic light emitting layer 155, Green color filter patterns 173a, 173b, and 173c of the red, green, and blue color filter patterns 173a, 173b, and 173c, which are provided on the facing second substrate 170 and face the organic light emitting layer 155, 173b), and the progress of the light is substantially blocked by the red or blue color filter patterns 173a and 173c corresponding to neighboring pixel regions P located in the vicinity of the light It is possible to suppress or reduce light leakage.

7 is a cross-sectional view schematically showing a part of a display area AA of an organic electroluminescent device including a conventional color filter layer as a comparative example according to the first embodiment of the present invention, And a state of progress together. At this time, in the first substrate, the driving and switching thin film transistors are omitted and only the banks and the organic light emitting diodes are shown.

As shown in the figure, in the case of the organic electroluminescent element 71 having a conventional color filter layer having a cell gap of about 12 mu m as a comparative example, the organic electroluminescent element 71 is provided in any one of the pixel regions (hereinafter referred to as a reference pixel region SP1) Light having a gradient of 0 degree to 45 degrees with respect to light emitted from the organic light emitting layer 56 and proceeding in a vertical direction is referred to as an organic light emitting layer (not shown) provided in the reference pixel region SP1 56 and the corresponding color filter pattern 85b, the light having desired color and luminance characteristics is obtained. However, the light having a slope of 45 degrees or more and less than 90 degrees with respect to the reference light, that is, The light having a predetermined wavelength is passed through the color filter patterns 85a and 85c provided in the other pixel region P, and thus has unwanted color and luminance characteristics, thereby generating a large amount of light leakage.

However, in the case of the organic electroluminescent device 101 according to the first embodiment of the present invention, the cell gap is about 2 탆, the reference light emitted from the organic light emitting layer 155 provided in the reference pixel region SP2 is referred to Light having a slope of 0 to 82.4 passes through the color filter pattern 173b corresponding to the organic light emitting layer 155 provided in the reference pixel region SP2 and becomes light having desired color and luminance characteristics, Only light having a slope of about 82.4 degrees or more and less than 90 degrees relative to the reference light, that is, a light having a slope range of about 7.6 degrees, passes through the color filter patterns 173a and 173c provided in the other pixel region P, have.

Accordingly, since the organic electroluminescent device 101 according to the first embodiment of the present invention can remarkably suppress the light traveling in the direction of generating the light leakage compared to the organic electroluminescent device 71 having the conventional color filter layer, It can be seen that it has a very excellent effect in terms of suppressing color vision angle defect through reduction.

FIG. 8 is a graph showing the relationship between the luminance of the organic EL device according to the first embodiment of the present invention and the organic EL device having the conventional color filter layer as a comparative example, The graph of the upper part shows a graph corresponding to the comparative example and the graph of the lower part shows the graph of the lower part of the graph. 1 is a graph corresponding to the first embodiment of the present invention.

As shown in the figure, in the case of an organic electroluminescent device including a conventional color filter layer as a comparative example, light of a wavelength band (500 to 580 nm) substantially corresponding to green should mainly come out as a peak. In addition to light of a green wavelength band, It is understood that the peak of the light of the wavelength band 420 to 480 is emitted at a ratio of about 5: 5.

However, in the case of the organic electroluminescent device according to the first embodiment of the present invention, a very small amount (about 1/10 of the level) of light having a peak value in the wavelength range of 460 to 500 nm indicating blue is included, It can be seen that the light has a peak value of the corresponding wavelength band (500 to 580 nm).

Accordingly, when reflecting such graph characteristics, it is understood that the light leakage is reduced compared to the conventional organic electroluminescent device including the conventional color filter layer, which is an organic electroluminescent device according to the first embodiment of the present invention, and the color viewing angle defect is significantly reduced have.

7, the organic light emitting device 101 according to the first exemplary embodiment of the present invention includes a second substrate 170 on which an auxiliary pattern 178 made of an overcoat material is formed, The first and second substrates 110 and 170 are not formed on the boundary between the first and second substrates 110 and 170 but are partially formed only on the boundary between the pixel regions P, .

In the case of the organic electroluminescent device 71 including the conventional color filter layer, the overcoat layer 87 is formed on the entire surface of the counter substrate 80 so that the adhesive layer 90 is bonded to the overcoat layer 87 Whereby the shrinkage of the adhesive layer 90 is caused by the interaction between the overcoat layer 87 made of an organic insulating material and the adhesive layer 90.

However, the organic electroluminescent device 101 according to the first embodiment of the present invention is formed only for the boundary of each pixel region P in the form of the auxiliary pattern 178 in which the overcoat layer is patterned, Since the black matrix 181 is formed on the upper portion of the pattern 178, the contact between the adhesive layer 190 and the auxiliary pattern 178 of the overcoat layer material is minimized, The shrinkage of the adhesive layer 190 caused by the interaction between the adhesive layer 190 and the adhesive layer 190 is naturally suppressed.

Further, since the overcoat layer covering the center portion of the color filter layer 173 is omitted, the organic light emitting device 101 according to the first embodiment of the present invention has a reduced transmittance due to the overcoat layer. And the transmittance of the organic electroluminescent device (71 of FIG. 2) in which the overcoat layer is provided is suppressed.

Meanwhile, in the organic EL device 101 according to the first embodiment of the present invention having the above-described configuration, the configuration of the second substrate 170 having the color filter layer 173 may be variously modified.

FIGS. 9, 10 and 11 are cross-sectional views, respectively, of a display region of an organic electroluminescent device according to second, third, and fourth embodiments of the present invention, respectively.

In the organic electroluminescent device according to the second, third and fourth embodiments of the present invention, the first substrate has the same configuration as that of the organic electroluminescent device according to the first embodiment of the present invention described above and modifications thereof, Only the structure of the second substrate on which the filter layer is formed differs from that of the second substrate on which the filter layer is formed. The constituent elements of the first substrate having the same configuration are denoted by the same reference numerals as those of the first embodiment, and the constituent elements of the second substrate having the different configurations are 300, 400 , 500 were added and designated by reference numerals.

Referring to FIG. 9, the organic electroluminescent device 401 according to the second embodiment of the present invention includes the auxiliary pattern (178 in FIG. 4) of the second substrate 470, And a black matrix 481 is formed on the border of each pixel region P in contact with the color filter layer 473 on the upper portion of the filter layer 473.

If the auxiliary pattern (178 in FIG. 4) is omitted, the cell gap increases by about 1 to 2.5 μm, which is the thickness of the auxiliary pattern 178, compared to the first embodiment. However, (D in the range of 12 to 15 mu m) of the conventional organic electroluminescent device having the color filter layer (71 in Fig. 2) is small compared to that of the conventional color filter layer The generation of light leakage can be suppressed compared with the conventional organic electroluminescent device having the color filter layer (71 of FIG. 2), and thus the color viewing angle defect is reduced. Further, the auxiliary pattern of the overcoat layer material It is understood that the shrinkage of the adhesive layer 190 caused by the contact with the overcoat layer is originally suppressed because there is no component made of the overcoat layer material.

10, an organic electroluminescent device 501 according to a third exemplary embodiment of the present invention includes an overcoat layer (not shown) formed on an entire surface of a display area AA over a color filter layer 573 in a second substrate 570, And a black matrix 581 is formed on the boundary of each pixel region P on the overcoat layer 575.

The organic EL device 501 according to the third embodiment of the present invention having such a structure is also formed on the inner surface of the second substrate 570 at the top of the black matrix 581, And is formed smaller than the electroluminescent element (71 in Fig. 2).

Accordingly, since the organic electroluminescent device 501 according to the third embodiment of the present invention can also suppress the generation of light leakage compared to the organic electroluminescent device (71 of FIG. 1) including the conventional color filter layer, the color viewing angle defect can be reduced Effect.

In the organic EL device 501 according to the third embodiment of the present invention, the overcoat layer 575 is formed on the color filter layer 573 of the second substrate 570 over the entire display area AA The adhesive layer 190 may be shrunk when the first and second substrates 110 and 570 are attached to each other due to the contact between the overcoat layer 575 and the adhesive layer 190. In addition, Since the black matrix 581 is provided on the overcoat layer 575 at the boundary portion of each pixel region P on the constitutional characteristic of the organic electroluminescent device 501 according to the third embodiment of the present invention, (71 in Fig. 2) including a conventional color filter layer having a configuration in which the front surface (90 in Fig. 2) and the front surface in contact with the overcoat layer (87 in Fig. 2) can be suppressed.

Referring to FIG. 11, in the case of the organic EL device 601 according to the fourth embodiment of the present invention, as in the configuration of the organic EL device (501 in FIG. 10) according to the third embodiment of the present invention, A color filter layer 673 is provided on the inner surface of the substrate 670 and an overcoat layer 675 is formed on the entire surface of the display area AA on top of the color filter layer 673. A black matrix 681 is formed on the overcoat layer 675 Is similar to the structure in that it is formed at the boundary of each pixel region P.

However, after the overcoat layer 675 is formed or the black matrix 681 is formed on the overcoat layer 675, the organic electroluminescent device 601 according to the fourth embodiment of the present invention may be formed with oxygen The surface of the overcoat layer 675 is further modified by exposing the surface of the overcoat layer 675 to plasma (O ₂ plasma) to further improve the surface modification layer 677 on the surface of the overcoat layer 675 .

In the drawing, it is shown that the surface modification layer 677 is provided only on the surface of the overcoat layer 675 exposed to the outside of the black matrix 681 by proceeding with the oxygen plasma (O ₂ plasma) after forming the black matrix 681 Respectively.

In the case of the organic electroluminescent device 601 according to the fourth embodiment of the present invention, the level of light leakage is the same as that of the organic electroluminescent device 501 according to the third embodiment of the present invention (see FIG. 10) The surface modification layer 677 is provided on the surface of the overcoat layer 675 by an O ₂ plasma process to prevent direct contact between the overcoat layer 675 and the adhesive layer 190, And has an effect of suppressing shrinkage of the adhesive layer 190 when the substrates 110 and 670 are attached together.

Hereinafter, a method of manufacturing the organic electroluminescent device according to the first to fourth embodiments of the present invention will be described. In this case, the method of manufacturing the first substrate having the driving and switching thin-film transistors and the organic light emitting diode according to the embodiments of the present invention is the same as the method of manufacturing a general organic light emitting device, Only the method of manufacturing the second substrate having the characteristic configuration will be described.

The manufacturing method according to the first embodiment will be described with reference to the manufacturing method of the second substrate. In the manufacturing method according to the second to fourth embodiments, only the different parts from the first embodiment will be briefly described.

12A to 12F are cross-sectional views illustrating steps of manufacturing an organic electroluminescent device according to a first embodiment of the present invention.

First, as shown in FIG. 12A, a red resist is applied to the entire surface of the display area AA on a transparent insulating substrate 170, for example, a glass or plastic substrate, and the exposure and development using the exposure mask are performed The red color filter pattern 173a is formed in the region (hereinafter, referred to as the first pixel region P1) by forming a red color filter pattern.

The formation of the red color filter pattern 173a in the first pixel region P1 may be performed by the progress of the mask process including the application of the red resist and the exposure and development using the exposure mask as described above, (Not shown) is placed on the insulating substrate 170 using a thermal transfer film (not shown) including a conversion layer and a red resist layer, and a laser beam is irradiated onto the first pixel region P, (Not shown) at a portion corresponding to the first insulating layer 110, and then transferring the red resist layer onto the insulating substrate 110 by removing the thermal transfer film (not shown).

Next, as shown in FIG. 12B, the same method as the above-described formation of the red color filter pattern 173a is performed so that the second and third pixel regions P1 and P2, in which the green and blue color filter patterns are to be formed, Green and blue color filter patterns 173b and 173c are formed on the insulating substrate 170 so that the red, green and blue color filter patterns 173a, 173b and 173c are sequentially and repeatedly formed on the display area AA on the insulating substrate 170 The color filter layer 173 is provided.

At this time, the color filter patterns 173a, 173b, and 173c of the respective colors may have a structure in which color filter patterns of two different colors are superimposed on the boundary of the boundary enhancement pixel regions P1, P2, and P3, But may be formed adjacent to each other without overlapping.

In the drawing, the color filter patterns 173a, 173b, and 173c are not overlapped with each other.

Next, as shown in FIG. 12C, a transparent organic insulating material is applied on the color filter layer 173 to form an overcoat layer 175 over the entire display area AA.

Next, as shown in FIG. 12D, an auxiliary pattern 178 is formed on the boundary of each pixel region P1, P2, and P3 by patterning the mask over the overcoat layer 175 (FIG. 12C) . The red, green and blue color filter patterns 173a, 173b and 173c formed in the pixel regions P1, P2 and P3 are exposed to the outside of the auxiliary pattern 178 .

On the other hand, in the case of the second embodiment of the present invention, the process shown in Figs. 12C and 12D, that is, the formation of the overcoat layer (175 in Fig. 12C) and the formation of the auxiliary pattern And in the case of the third and fourth embodiments, the patterning process of the overcoat layer (175 in Fig. 12D) shown in Fig. 12D is omitted.

Next, as shown in FIG. 12E, a black resin is applied to the entire surface of the insulating substrate 170 on the auxiliary pattern 178, and a mask process is performed on the black resin so that the black resin is applied to the boundary between the pixel regions P1, P2, and P3 The second substrate 170 for an organic electroluminescence device according to the first embodiment of the present invention is completed by forming the black matrix 181.

The second substrate 170 for an organic electroluminescence device according to the first embodiment of the present invention manufactured by such a manufacturing method is formed such that the black matrix 181 is formed on the boundary between the pixel regions P1, And is formed on the auxiliary pattern 178.

9, the auxiliary pattern (178 in FIG. 4) is omitted, and the black matrix 481 is arranged in the boundary of each pixel region P of the color filter layer 473. In the case of the second embodiment, As shown in Fig.

10, an overcoat layer 575 is formed on the entire surface of the color filter layer 573. The black matrix 581 is formed on the overcoat layer 575, And is formed at the boundary of the area P.

13A and 13B (according to the fourth embodiment of the present invention) in the state where the overcoat layer 675 is formed on the entire surface above the color filter layer 673 by the progress of the process according to FIG. The surface of the overcoat layer 675 is modified by being exposed to the oxygen plasma as shown in the cross-sectional view of the process of manufacturing the second substrate of the organic electroluminescent device), so that the surface of the overcoat layer 675 is modified The second substrate 670 is completed by forming the black matrix 681 at the boundary between the pixel regions P1, P2 and P3 on the surface modification layer 677 after the surface modification layer 677 is formed. do.

An overcoat layer (not shown) in a state in which the black matrix 681 is exposed outside the black matrix 681 in a state in which the black matrix 681 is formed on the boundary of the pixel regions P1, P2, and P3 on the overcoat layer 675 675 is subjected to an oxygen plasma process so that the surface of the overcoat layer 675 is modified by being exposed to the oxygen plasma so that the surface modification layer 677 is formed on the surface of the overcoat layer 675, Can be completed.

12F, a switching and driving thin film transistor (not shown, DTr) and the banks 150 and 160 are formed by the second substrate 170 and the general organic electroluminescent device fabrication method as described above, The first substrate 110 having the organic electroluminescent diode E is faced to each other and a resin such as epoxy having a transparent and adhesive property between the two substrates 170 and 110 is formed on the first substrate 110 ) Or the entire surface of the display area AA of the second substrate 170 and the first and second substrates 110 and 170 are bonded together such that the organic EL device E and the black matrix 181 face each other The organic electroluminescent device according to the first embodiment of the present invention is completed.

The present invention is not limited to the above-described embodiments and modifications, and various modifications may be made without departing from the spirit of the present invention.

101: organic electroluminescent device 110: first substrate
113: semiconductor layers 113a and 113b: first and second regions
116: gate insulating film 120: gate electrode
123: interlayer insulating film 125: semiconductor layer contact hole
133: source electrode 136: drain electrode
140: protective layer 143: drain contact hole
147: first electrode 147a: (first electrode)
147b: (first electrode) upper layer 150: bank
155: organic light emitting layer 158: second electrode
170: second substrate 173: color filter layer
173a, 173b, and 173c: red, green, and blue color filter patterns
178: auxiliary pattern 181: black matrix
190: adhesive layer AA: display area
d1: cell gap DA: drive region
DTr: driving thin film transistor P: pixel region

Claims (17)

A first substrate on which a display region having a plurality of pixel regions is defined;
An organic light emitting diode formed in each pixel region on the first substrate;
A second substrate facing the first substrate and spaced apart from the first substrate;
A color filter layer formed on a side surface of the second substrate;
A black matrix formed on the boundary of the pixel regions on the color filter layer;
And an adhesive layer interposed between the first substrate and the second substrate
And an organic electroluminescent device.
The method according to claim 1,
And an auxiliary pattern is formed between the color filter layer and the black matrix along the boundary of the pixel regions.
The method according to claim 1,
And an overcoat layer is formed on the entire surface of the display area between the color filter layer and the black matrix.
The method of claim 3,
Wherein the overcoat layer has a surface modified layer formed on its surface by an oxygen plasma treatment.
5. The method according to any one of claims 1 to 4,
The organic light emitting diode includes a first electrode formed separately for each pixel region, an organic light emitting layer formed on the first electrode, and a second electrode formed on the entire surface of the organic light emitting layer,
A bank is formed on the first substrate so as to overlap a rim of the first electrode on the boundary of each pixel region on the first substrate, the organic emission layer is formed in a region surrounded by the bank, Wherein the organic EL layer is formed on the entire surface of the display region to cover the bank.
6. The method of claim 5,
Wherein the organic light emitting layer comprises the same organic light emitting material over the entire surface of the display region.
The method according to claim 6,
Wherein the first electrode comprises:
The organic light emitting layer is formed to have the same thickness in each pixel region so that the organic light emitting layer emits light of a single color all over the display region,
Or each pixel region has a different thickness so that the organic light emitting layer emits different colors for each pixel region.
8. The method of claim 7,
The color filter layer is formed by sequentially repeating color filter patterns of red, green, and blue for each pixel region,
Wherein the color filter layer is formed such that the red, green, and blue color filter patterns are adjacent to each other at a boundary of each pixel region, or the color filter patterns of two different colors overlap each other.
6. The method of claim 5,
And a switching thin film transistor and a driving thin film transistor connected to the switching thin film transistor and the organic light emitting diode are formed in the respective pixel regions on the first substrate.
6. The method of claim 5,
The adhesive layer is made of a transparent resin and has a thickness of 5 to 8 占 퐉 based on the center of each pixel region,
Wherein a cell gap defined as a spacing distance between the second electrode formed on the bank and the black matrix is 1 占 퐉 or more and smaller than a thickness of the adhesive layer.
Forming an organic light emitting diode in each pixel region on a first substrate on which a display region having a plurality of pixel regions is defined;
Forming a color filter layer on the inner surface of the second substrate facing the first substrate corresponding to the display area;
Forming a black matrix on the boundary of each pixel region on the color filter layer;
Attaching the first and second substrates together with an adhesive layer between the first substrate and the second substrate
Wherein the organic electroluminescent device comprises a first electrode and a second electrode.
12. The method of claim 11,
The step of forming the organic light emitting diode includes:
Forming a first electrode separated on the first substrate by the pixel region, forming an organic light emitting layer on the first electrode, and forming a second electrode on the entire surface of the display region above the organic light emitting layer In addition,
Further comprising the step of forming a bank at a boundary of each pixel region after overlapping the edge of the first electrode with the upper portion of the first electrode after forming the first electrode,
Wherein the organic light emitting layer is formed in a region surrounded by the bank and the second electrode covers the bank and is formed on the entire surface of the display region.
13. The method of claim 12,
Forming an overcoat layer on the color filter layer over the entire display area after forming the color filter layer and before forming the black matrix.
14. The method of claim 13,
And patterning the overcoat layer to form an auxiliary pattern at a boundary between the pixel regions before forming the black matrix.
14. The method of claim 13,
And exposing the overcoat layer to oxygen plasma before or after forming the black matrix to modify the surface of the overcoat layer to form a surface modification layer.
13. The method of claim 12,
The color filter layer is formed so as to sequentially repeat red, green, and blue color filter patterns for each pixel region,
Wherein the color filter layer is formed so that the red, green, and blue color filter patterns are adjacent to each other at the boundary of each pixel region, or the color filter patterns of two different colors overlap each other Gt;
13. The method of claim 12,
Wherein the adhesive layer is made of a transparent resin and has a thickness of 5 to 8 탆 with respect to the center of each pixel region,
Wherein a cell gap defined as a spacing distance between the second electrode formed on the bank and the black matrix is 1 占 퐉 or more and smaller than a thickness of the adhesive layer.

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