KR20160091075A - Organic electro-luminescent device and method of fabricating the same - Google Patents

Abstract

The present invention relates to an organic electro-luminescent device capable of preventing an opening rate from being decreased due to the difference in thickness between a boundary part and a central part in each pixel region when a liquid-phase organic light emitting layer is formed, and thus of preventing lifespan from being lowered by reducing a pile-up phenomenon in which the thickness at the center of a light emitting region is thicker than that at the periphery of a bank. The organic electro-luminescent device includes a first substrate, a first electrode, an auxiliary layer, a bank, an organic light emitting layer, and a second electrode. The first substrate has a display region in which a plurality of light emission regions are defined. The first electrode is provided according to the light emission regions. The auxiliary layer is provided on an entire surface of the display region on the first electrode and formed of a material having a hydrophilic property and a hole injection ability. The bank is overlapped with an edge of the first electrode on the auxiliary layer to surround each light emission region. The organic light emitting layer is provided on the auxiliary layer inside each light emission region surrounded by the bank. The second electrode is formed at an upper portion of the organic light emitting layer throughout the entire surface of the display region. As described above, according to the present invention, the organic electro-luminescent device includes the auxiliary layer formed of tungsten oxide (WO_3) having an excellent hydrophilic property form the entire surface of the display region at the upper portion of the first electrode and an excellent hole injection ability into an organic light emitting material layer or a hole transfer layer. Accordingly, the pile-up phenomenon of the organic light emitting layer at the periphery of the bank is reduced, so that an area of the light emitting layer having a flat surface is increased in each light emitting region. Accordingly, the light emitting region is actually expanded, so that the opening rate can be improved.

Description

TECHNICAL FIELD [0001] 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 reducing the pile-up phenomenon in which the thickness of the organic light emitting layer increases around the bank, To an organic electroluminescent device capable of suppressing a drop in aperture ratio and a shortened lifetime due to a difference in thickness between an edge portion and a center portion in a viewing pixel region.

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

Since the organic electroluminescent device is a self-luminous device that emits light by itself, it has a high contrast ratio and does not require an additional light source, thereby realizing an ultra-thin display.

In addition, since the response time of the organic electroluminescent device is as small as several microseconds (microseconds), no afterimage is generated in the realization of moving images, so that the organic electroluminescent device has excellent display quality, has no viewing angle limit, is stable at low temperature, The driving circuit can be easily manufactured and designed.

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

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

BACKGROUND ART An organic electroluminescent device is largely composed of an array element and an organic electroluminescent diode. The array element includes a switching thin film transistor connected to a gate and a data line, and a driving thin film transistor connected to the organic light emitting diode. The organic light emitting diode includes a first electrode connected to the driving thin film transistor, Electrode.

In the organic electroluminescent device having such a configuration, light generated from the organic light emitting layer is emitted toward the first electrode or the second electrode to display an image. Considering the aperture ratio and the like, in recent years, And is manufactured by a top emission type in which an image is displayed by using emitted light.

On the other hand, in the general organic light emitting display, the organic light emitting layer is formed by a thermal evaporation method using a shadow mask.

However, in recent years, a larger shadow mask has been required due to the enlargement or enlargement of the display device, and since the shadow mask having a large size is severely deflected and self-warped, the defective deposition is increased, It is getting harder and harder.

In addition, a shadow effect is generated in thermal evaporation using a shadow mask, and it is difficult to fabricate an organic electroluminescent device having a high resolution of 250 PPI or more as the current technology.

Therefore, a method of forming an organic light emitting layer that replaces a thermal deposition process using a shadow mask for manufacturing a large area organic electroluminescent device has been proposed.

The proposed method of forming an organic light emitting layer is to spray or drop a liquid organic light emitting material into a region surrounded by a bank through an ink jet apparatus or a nozzle apparatus, and then cure.

FIG. 1 is a cross-sectional view of a portion of a display region of an organic electroluminescent device in which an organic light emitting layer is formed using a conventional ink jet apparatus, except that the planarizing layer, the banks provided thereon, and the organic light emitting diodes Fig.

In order to eject the liquid organic light emitting material through the ink jet device (not shown) or to drop the liquid organic light emitting material through the nozzle device, the organic luminescent material in a liquid state flows around in each light emitting area EA1 It is necessary to form a bank 53 which surrounds each light emitting region EA1 in which the first electrode 50 is formed.

Therefore, as shown in the figure, after the first electrode is formed on the planarization layer, before the organic light emitting layer 55 is provided for each light emitting region, a bank 53 having a dam shape is formed along the boundary of each light emitting region EA1 . For convenience of explanation, a region surrounded by the bank is defined as a first light emitting region EA1.

At this time, the bank 53 is made of an organic material having a hydrophobic property. The reason for making the bank 53 hydrophobic in this way is that when the liquid organic luminescent material is injected or dropped through the ink jet device or the nozzle device, the first light emitting area surrounded by the bank 53 EA1, and even if they are injected in a predetermined amount onto the banks 53, they are flown down from the banks 53 to be located in the first luminescent areas EA1. Further, the injection amounts of the organic luminescent materials in the liquid phase Is overflowed to the upper side of the bank (53).

When the head of the ink-jet apparatus or the nozzle of the nozzle device is positioned in each of the first light-emitting regions EA1 surrounded by the banks 53 to eject or drop the liquid material, the liquid material And the organic luminescent layer 55 is formed by drying and curing the liquid material by performing heat treatment in this state.

Although the organic light emitting layer 55 has a single layer structure in the drawing, the organic light emitting layer 55 may include a hole injection layer, a hole transport layer, an organic light emitting material layer, an electron transport layer, And further has an electron injecting layer over the electron transporting layer to have a five-layer structure. The organic light-emitting layers 55 of the quadruple layer and the fifth layer are all formed by ejecting or dropping a liquid substance using an ink jet apparatus or a nozzle apparatus.

However, as described above, when the liquid organic material is injected and dropped through the ink jet device or the nozzle device and dried to form the organic light emitting layer 55 having the multi-layer structure, the first light emitting A pile-up phenomenon occurs in which the thickness of the edge portion adjacent to the bank 53 is made thicker than the central portion in the region EA1.

When the thickness of the organic light emitting layer 55 in each light emitting region EA1 is different, a difference in the light emitting efficiency is caused by the application of the same amount of current. As a result, the organic light emitting layer 55 Is darker than the other areas. The dark part is felt as a stain when the user looks at it. Therefore, when the thick part is formed, it is not visible to the user, EA2).

In the case of the conventional organic electroluminescent device 1 having such a configuration, the region where the light is emitted toward the user side is not the entire surface of the first luminescent region EA1 surrounded by the bank 53, but the surface of the organic luminescent layer 55, The second light emitting region EA2 is formed to have a uniform luminance and emits light, and thus the aperture ratio of the conventional organic electroluminescent device is greatly reduced.

In recent years, an organic electroluminescent device having a two-end bank structure has been proposed in order to alleviate the piling up phenomenon of the organic light emitting layer 55, which is generated when a liquid organic light emitting material is injected or dropped through an ink jet device or a nozzle device .

In the case of the organic electroluminescent device having such a two-end bank structure, the lower bank is formed to have a first width as a hydrophilic material, and has a second width smaller than the first width as a hydrophobic substance on the lower bank, The filing up phenomenon of the organic light emitting layer around the banks can be mitigated to some extent by the hydrophilic property of the lower bank.

However, in the case of an organic electroluminescent device (not shown) provided with such a two-end bank, an additional one masking process is required for realizing the two-end bank, .

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 which does not require an additional mask process by forming a bank of a single layer type and can reduce a pileup phenomenon, And a method for manufacturing the same.

According to an aspect of the present invention, there is provided an organic electroluminescent device including a first substrate having a display region in which a plurality of emission regions are defined, a first electrode formed in each of the plurality of emission regions, An auxiliary layer formed on the first electrode over the entire surface of the display region and having a hydrophilic property and a hole injecting capability; and an auxiliary layer overlying the auxiliary layer and surrounding the plurality of light emitting regions, An organic light emitting layer provided on the auxiliary layer in each of the plurality of light emitting regions surrounded by the bank and a second electrode provided on the entire surface of the display region above the organic light emitting layer.

In this case, the auxiliary layer is preferably made of tungsten oxide (WO ₃ ), and the auxiliary layer is made of a crystallized first portion corresponding to each of the light emitting regions, and the portion corresponding to the bank is formed of a second .

The organic light emitting layer has a three-layer structure of a hole transporting layer, an organic light emitting material layer and an electron transporting layer, or a structure of a hole transporting layer, an organic light emitting material layer, an electron transporting layer and an electron injecting layer. The organic emission layer may further include a hole injection layer between the auxiliary layer and the hole transport layer.

In addition, a plurality of switching thin film transistors, a driving thin film transistor, and a planarization layer covering the switching thin film transistor and the drain electrode of the driving thin film transistor are formed under the first electrode on the first substrate, And the first electrode is formed in contact with the drain electrode of the driving thin film transistor on the planarization layer.

According to another aspect of the present invention, there is provided a method of manufacturing an organic electroluminescent device, comprising: forming a first electrode on a first substrate having a plurality of light emitting regions defined therein, Forming an auxiliary layer on the entire surface of the display region by depositing a material having a hydrophilic property and a hole injecting capability over the first electrode; forming a second electrode on the auxiliary layer by overlapping the edge of the first electrode, Forming an organic light emitting layer by injecting or dropping a liquid material onto the auxiliary layer through the ink jet device or the nozzle device in each of the plurality of light emitting regions surrounded by the banks, And forming a second electrode over the entire surface of the display region on the organic light emitting layer.

At this time, it is preferable that the material having the hydrophilic property and the hole injection ability is tungsten oxide (WO ₃ ), and the deposition is preferably vacuum thermal deposition or sputtering.

The organic light emitting layer is formed to have a three-layer structure of a hole transport layer, an organic light emitting material layer, and an electron transport layer, or a four-layer structure of a hole transport layer, an organic light emitting material layer, an electron transport layer, and an electron injection layer At this time, a hole injection layer may be further formed on the auxiliary layer before forming the hole transport layer.

And forming a first portion crystallized by irradiating a laser beam to the auxiliary layer exposed to the outside of the bank before the organic light emitting layer is formed, and forming a second portion of the amorphous state corresponding to the portion corresponding to the bank . In this case, the laser beam is preferably a pulsed laser beam having a wavelength range of 248 nm to 1060 nm.

The organic electroluminescent device according to the embodiment of the present invention and its modified examples may be formed of tungsten oxide (WO ₃₎ having superior hydrophilicity to the entire display region and high hole injecting ability into the organic light emitting material layer or the hole transporting layer, ), The filing up phenomenon around the banks of the organic light emitting layer formed using the liquid material is reduced compared to the conventional organic light emitting device having the two-end bank, As the area of the portion having a flat surface increases, the aperture ratio is improved by the expansion of the actual light emitting region EA3.

In addition, the organic light emitting device according to the embodiment of the present invention and its modified examples have improved brightness and uniform luminance characteristics by increasing the portions of the organic light emitting layer having a flat surface in each light emitting region, Defects are suppressed and the display quality is improved.

In addition, the organic electroluminescent device according to the embodiment of the present invention and the modified example of the present invention has an effect of suppressing the deterioration of the organic luminescent layer and prolonging the lifetime by improving the thickness uniformity of the organic luminescent layer have.

Further, unlike the conventional organic electroluminescent device having the two-end bank, the organic electroluminescent device according to the modification of the embodiment of the present invention does not need to form the two-end bank since the bank having the single-layer structure is provided, By omission, the productivity per unit time is improved by simplifying the manufacturing process, and further, the material cost is reduced.

FIG. 1 is a cross-sectional view of a portion of a display region of an organic electroluminescent device in which an organic light emitting layer is formed using a conventional ink jet apparatus, except that the planarizing layer, the banks provided thereon, and the organic light emitting diodes Fig.
2 is a circuit diagram of one pixel region of an organic electroluminescent device.
3 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to an embodiment of the present invention.
4 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a modification of the embodiment of the present invention.
5A to 5J are cross-sectional views illustrating steps of manufacturing an organic electroluminescent device according to an embodiment of the present invention.
FIGS. 6A to 6D are cross-sectional views illustrating steps of manufacturing an organic electroluminescent device according to a modification of the embodiment of the present invention. Referring to FIGS. 6A to 6D, the organic light emitting device includes a second substrate for encapsulation, Sectional view of the manufacturing process showing the step.

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. 2, which is a circuit diagram for one pixel region of the organic electroluminescent device.

A switching thin film transistor STr, a driving thin film transistor DTr, a storage capacitor StgC, and an organic light emitting diode E are formed in each pixel region P of the organic electroluminescent device, .

That is, the gate line GL is formed in the first direction and the data line DL is formed in the second direction intersecting the first direction to form the data line DL surrounded by the gate line GL and the data line DL. And a power supply line PL for applying a power source voltage is formed in the pixel region P spaced apart from the data line DL.

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 voltage transmitted through the power supply line PL is transmitted to the organic light emitting diode E through the driving thin film transistor DTr. 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 transistor DTr is turned on so that light is output through the organic electroluminescent 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, It becomes possible to implement a gray scale.

The storage capacitor StgC maintains a constant gate voltage of the driving thin film transistor DTr when the switching thin film transistor STr is turned off so that the switching thin film transistor STr is turned off off state, the level of the current flowing through the organic light emitting diode E can be maintained constant until the next frame.

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

The organic EL device 101 according to the embodiment of the present invention includes a first substrate 110 on which a driving and switching thin film transistor DTr (not shown) and an organic light emitting diode E are formed, And a second substrate 170 for encapsulation. At this time, the second substrate 170 for encapsulation may be formed by forming an inorganic insulating film and / or an organic insulating film for suppressing moisture penetration on the second electrode 160, or increasing the extraction efficiency of the emitted light May be omitted when a capping film is formed.

First, the structure of the first substrate 110 including the driving and switching thin film transistor DTr (not shown) and the organic electroluminescent diode E will be described.

The driving region DA and the switching region (not shown) on the first substrate 110 are respectively formed of pure polysilicon and the central portion thereof includes a first region 113a and a second region 113b. And a second region 113b doped with impurities at a high concentration on both sides of the semiconductor layer 113a.

At this time, a buffer layer (not shown) made of an inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiNx) is further provided on the entire surface between the semiconductor layer 113 and the first substrate 110 It is possible. 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. A gate insulating layer 116 is formed on the semiconductor layer 113 The gate electrode 120 is formed in correspondence with the first region 113a of the gate electrode 120a. The gate insulating layer 116 is connected to a gate electrode (not shown) formed in the switching region (not shown) and extends in one direction to form a gate wiring (not shown).

Next, an interlayer insulating film 123 made of an inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiNx) is formed on the gate electrode 120 and the gate wiring (not shown). A semiconductor layer contact hole 125 exposing the second region 113b located on both sides of the first region 113a is formed in the interlayer insulating layer 123 and the gate insulating layer 116 below the interlayer insulating layer 123 .

Next, data wiring (not shown) crossing the gate wiring (not shown) and power wiring (not shown) are formed on the upper part of the interlayer insulating film 123 provided with the semiconductor layer contact hole 125, Is formed.

The source and drain electrodes 113 and 114 are in contact with the second region 113b which are spaced apart from each other in the driving region DA and the switching region (not shown) above the interlayer insulating layer 123 and exposed through the semiconductor layer contact hole 125, Drain electrodes 133 and 136 are formed.

On the other hand, the source and drain electrodes 133 and 136, which are separated from the semiconductor layer 113, the gate insulating film 116, the gate electrode 120, and the interlayer insulating film 123 sequentially stacked in the driving region DA, Thereby forming a driving thin film transistor DTr.

At this time, a switching thin film transistor (not shown) having the same stacking structure as the driving thin film transistor DTr formed in the driving region DA is formed in the switching region (not shown).

The switching thin film transistor (not shown) is electrically connected to a gate wiring (not shown) and a data wiring (not shown), and further to the driving thin film transistor DTr.

In the organic electroluminescent device 101 according to the 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 type) is shown as an example.

However, the driving and switching thin film transistor (DTr) (not shown) may be a bottom gate type having a semiconductor layer made of amorphous silicon or an oxide semiconductor material.

When the driving and switching thin film transistor (DTr, not shown) is configured as a bottom gate type, the gate electrode, the gate insulating film, and the active layer of pure amorphous silicon are spaced apart from each other, A gate electrode, a gate insulating film, an oxide semiconductor layer, an etch stopper, and an etch stopper spaced apart from each other on the etch stopper, wherein the semiconductor layer has a stacked structure of source and drain electrodes spaced from each other, And a lamination structure of source and drain electrodes in contact with the oxide semiconductor layer.

In the case of the first substrate 110 on which the bottom gate type driving and switching thin film transistor DTr (not shown) is formed, the gate wiring (not shown) is formed on the same layer, on which the gate electrode 120 is formed, (Not shown) of the driving thin film transistor DTr is connected to a gate electrode (not shown) of the driving thin film transistor DTr, and the data wiring (not shown) And a source electrode (not shown) formed on the substrate.

On the other hand, a drain contact hole (not shown) for exposing the drain electrode 136 of the driving thin film transistor DTr is formed on the driving and switching thin film transistor DTr, A planarization layer 140 having a plurality of planarization layers 143 is formed.

Although not shown in the drawing, a protective layer (not shown) made of an inorganic insulating material is formed between the driving and switching thin film transistor (DTr) (not shown) and the planarization layer 140 having a flat surface made of an organic insulating material In this case, the drain contact hole 143 is formed for the planarization layer 400 and the protection layer (not shown).

Next, the planarization layer 140 having a flat surface is contacted with the drain electrode 136 of the driving thin film transistor DTr through the drain contact hole 143, and the first electrode 150 Is formed.

The first electrode 150 has a larger area than the light emitting area EA and is formed for each pixel area P. Each of the pixel regions P includes a driving and switching region DA (not shown) in which array elements such as driving and switching thin film transistors (DTr, not shown) are provided, and a light emitting region EA surrounded by the banks 153 do.

The first electrode 150 is made of a transparent conductive material having a work function value of 4.8 eV to 5.2 eV, for example, indium-tin-oxide (ITO) It plays a role.

In the case where the first electrode 150 is made of indium-tin-oxide (ITO), which is a transparent conductive material having a large work function value, when the organic electroluminescent device 101 operates in the top emission mode, A reflective layer (not shown) made of any one of aluminum (Al) and aluminum alloy (AlNd), which is a metal material having excellent reflectivity, is further provided under the first electrode 150 .

When the reflective layer (not shown) is provided under the first electrode 150, light emitted from the organic light emitting layer 155 formed on the first electrode 150 is emitted through the reflective layer And reflects the light to the upper portion, thereby increasing the utilization efficiency of the emitted light and finally improving the luminance characteristic.

In this case, the reflective layer (not shown) is not separately formed under the first electrode 150, and the first electrode 150 itself has a double-layer structure, that is, a lower layer 150a made of a metal having excellent reflection efficiency, And an upper layer 150b made of indium-tin-oxide (ITO), so that the organic electroluminescent device 101 is driven in the top emission mode.

In the drawing, the first electrode 150 has a double layer structure of a lower layer 150a of metal having excellent reflectivity and an upper layer 150b made of indium-tin-oxide (ITO) having a large work function value .

The organic electroluminescent device 101 according to an embodiment of the present invention is characterized in that the organic electroluminescent device 101 has hydrophilic characteristics corresponding to the entire surface of the display area on the first electrode 150, And an auxiliary layer 152 formed of tungsten oxide (WO ₃ ), which is a material having a good ability to inject holes generated from the light emitting layer 150b into the organic light emitting material layer 150b.

The auxiliary layer 152 is a component of the organic light emitting layer and is formed on the entire surface of the display region on the first substrate 110 by the deposition method and on the first electrode 150 and the first electrode 150 And is formed on the exposed planarization layer 140.

The auxiliary layer 152 has a first portion 152a crystallized corresponding to the light emitting region EA and a portion overlapping the bank 153 has a second portion 152b having an amorphous state, Is another feature.

The auxiliary layer 152 has a flat surface at the top of the first electrode 150, a high thickness without a difference in thickness, and a hydrophilic tendency due to the material properties and the mechanism characteristics of the deposition And a function of suppressing the pileup phenomenon of the organic light emitting layer 155 formed by dropping the liquid organic material on the upper portion thereof through the ink jet device or the nozzle device.

The suppression of the pileup phenomenon of the organic light-emitting layer 152 by the formation of the auxiliary layer 152 will be described later in detail.

On the other hand, the light emitting area EA3 is surrounded by the edge of the first electrode 150 at a boundary of the light emitting area EA where the organic light emitting layer 155 is provided on the auxiliary layer 152, And a bank 153 having a single layer structure exposing a central portion of the first electrode 150 is formed.

The monolayer bank 153 may be formed of a polymer material having hydrophobic properties such as polyimide containing fluorine (F), styrene, methyl mathacrylate, polytetrafluoroethylene And polytetrafluoroethylene are mixed with each other.

In addition, the bank 153 has a trapezoidal cross-sectional shape, and the side surfaces of the banks 153 are inclined obliquely rather than perpendicularly with respect to the tapered surface of the auxiliary layer 152.

This is to prevent the second electrode 160 provided on the organic light emitting layer 155 formed inside the bank 153 from being formed continuously.

Meanwhile, in the interior of each light emitting region EA surrounded by the single layer bank 153 having the above-described shape, a liquid material is injected onto the auxiliary layer 152 by a jetting method using an ink jet apparatus, The organic light emitting layer 155 having a multi-layer structure is formed.

In this case, the organic light emitting layer 155 may be formed in the light emitting region EA in the vicinity of the bank 153, for example, As shown in FIG.

Since the bank 153 has a hydrophobic property and pushes the organic light emitting layer in the liquid phase around the bank 153, the auxiliary layer 152 has a strong hydrophilic property, Thereby giving a property of spreading over a large area.

The organic luminescent layer to be gathered around the bank 153 is lowered due to the hydrophilic property of the auxiliary layer 152 and at the same time the characteristic of being spread on the surface of the auxiliary layer 152 is strongly developed, The organic light emitting layer 155 may be formed to have a relatively uniform thickness.

In the case of the organic electroluminescent device having the conventional single layer bank (53 in FIG. 1) (see FIG. 1), the distance between the light emitting region EA1 and the actual light emitting region EA2, Referring to FIG. 3, the distance between the light emitting region EA and the actual light emitting region EA3 is the width (w1) of the organic light emitting diode according to the embodiment of the present invention. (W1 in FIG. 1) which is a second width w2 (w1 in FIG. 1) which is greatly reduced from the width W1 of FIG. 1, the actual light emitting area EA3 in the light emitting area EA is increased.

This is because it is possible to suppress the pileup phenomenon implemented in an organic electroluminescent element (not shown) having a lower layer (not shown) having a conventional hydrophilic property and a bank (not shown) having a two- .

However, in the organic electroluminescent device 101 according to the embodiment of the present invention, the effect of reducing the pileup phenomenon of the organic light emitting layer 155 in each luminescent region EA is lower than that of the prior art in which a bank (not shown) (Not shown) of the organic electroluminescent device of the present invention.

Further, unlike a conventional organic electroluminescent device (not shown) which requires a separate additional mask process for the implementation of the two-end bank (not shown), the organic electroluminescent device 101 according to the embodiment of the present invention may be additionally Since it does not require a mask process, it is superior to an organic electroluminescent device (not shown) having a conventional two-stage bank (not shown) in terms of manufacturing process, productivity, and material cost.

In the case of the organic electroluminescent device 101 according to the embodiment of the present invention, the auxiliary layer 152 made of tungsten oxide (WO ₃ ), which is a material having excellent hydrophilic properties, is provided on the entire display area.

Therefore, each light emitting area EA is provided with the auxiliary layer 152 having hydrophilic properties with respect to the entire surface thereof, so that the force for spreading the organic light emitting layer 155 formed on the light emitting area EA on the surface is the upper bank 153 (Not shown) in which a lower bank (not shown) is partially formed of a hydrophilic material with respect to the periphery of the organic electroluminescent device (not shown).

As a result, in the organic electroluminescent device 101 according to the embodiment of the present invention, the organic light emitting layer 155 spreads relatively more in each light emitting region EA, The organic light emitting layer 155 having a planarized surface is formed.

The organic light emitting layer 155 is formed not in a single layer structure but in a multilayer structure such as a hole injection layer 155e and a hole transport layer 155a, an organic light emitting material layer 155b, and an electron transport layer 155c And optionally the electron injection layer 155d.

The organic light emitting layer 155 may include a hole injecting layer 154, a hole transporting layer 155a, an organic light emitting layer 155b, Layer structure of a light emitting material layer 155b and an electron transporting layer 155c or an electron injecting layer 155d on the electron transporting layer 155c.

In this case, the auxiliary layer 152 functions to suppress the pile-up phenomenon during the formation of the organic light emitting layer to increase the area of a portion having a flat surface in each light emitting region, And more effectively inject holes into the electron transport layer 155a or the organic light emitting material layer 155b.

When the filing up phenomenon of the organic light emitting layer 155 is reduced, the area of the organic light emitting layer 155 having a flat surface in the light emitting region EA surrounded by the bank 153 is increased, EA3) is expanded, the aperture ratio and the luminance characteristic are improved and the lifetime is improved.

The auxiliary layer 152 has a hydrophilic property due to the material properties and has a superior hole injecting capability. Therefore, the auxiliary layer 152 replaces the role of the hole injecting layer 155e, which is a component of the organic light emitting layer 155 .

This auxiliary layer replaces the role of the hole injection layer is shown as an organic electroluminescent device according to a modification of the embodiment of the present invention.

4 is a cross-sectional view of a portion of a display region of an organic electroluminescent device according to a modification of the embodiment of the present invention. Here, the organic electroluminescent device according to the modification of the embodiment of the present invention differs from the organic electroluminescent device according to the modification of the embodiment of the present invention only in the lamination structure of the organic light emitting layer provided on the auxiliary layer, Only the constitution of the organic luminescent layer which is different from each other will be described.

In the case of the organic electroluminescent device according to the modification of the embodiment of the present invention, since the auxiliary layer 152 having the hydrophilic characteristic and the hole injection ability is provided on the entire surface of the display region above the first electrode, Layer structure of the hole injection layer 154, the hole transport layer 155a, the organic light emitting material layer 155b and the electron transport layer 155c or the electron injection layer 155d Layer structure of the hole transporting layer 155a, the organic light emitting material layer 155b and the electron transporting layer 155c is omitted or the electron transporting layer 155c ) To form a four-layer structure further including an electron injection layer 155d.

That is, in the organic electroluminescent device 102 according to the modified example of the embodiment of the present invention, the organic luminescent layer 155 may include the organic luminescent layer (not shown) of the organic electroluminescent device 101 Unlike the configuration of the organic light emitting layer (55 in FIG. 1) of the conventional organic electroluminescent device (155 in FIG. 3) or the conventional organic electroluminescent device (1 in FIG. 1) (55a in FIG. 3 or 55a in FIG. 1) is omitted by replacing the hole injection layer (55a in FIG.

Although the auxiliary layer 152 is added to the conventional organic electroluminescent device (1 in FIG. 1) in the organic electroluminescent device 102 according to the modified embodiment of the present invention having such a configuration, the auxiliary layer 152 ) Suppresses the fuzz-up phenomenon of the organic light-emitting layer 155 due to the hydrophilic property and is superior in the hole injection ability to replace the hole injection layer (55a in Fig. 1), which is one component constituting the organic light- In this case, the hole injection layer (55a in FIG. 1), which is one of the constituent elements of the organic light emitting layer 155, may be omitted. The conventional single layered bank (53 in FIG. 1) There is practically no additional process as compared with the organic electroluminescent device (1 in FIG. 1) having the organic light emitting layer having the five-layer structure or the four-layer structure (55 in FIG.

Therefore, there is an advantageous effect that the filing up phenomenon of the organic light emitting layer 155 compared to the organic light emitting device having the conventional single layer bank (1 in FIG. 1) can be suppressed without adding a process.

The organic electroluminescent device 102 according to the modified example of the embodiment of the present invention can be fabricated by using the organic electroluminescent device of the present invention or the conventional organic electroluminescent device (155 in FIG. 3 or 55 in FIG. 1) is omitted by omitting the hole injection layer (155e in FIG. 3 or 55a in FIG. 1) compared to the organic light emitting layer The total thickness of the hole injection layer (55a in FIG. 3) is reduced by the thickness of the hole injection layer (155e in FIG. 3 or 55a in FIG. 1), thereby further reducing the piling up phenomenon.

The filing-up phenomenon occurs when the organic material layer 155 is formed by ink jetting or nozzle dropping of a liquid material, and is generated in proportion to the thickness of the organic light emitting layer 155.

When the thickness of the organic light emitting layer 155 is reduced, the pileup phenomenon can be reduced. Each layer constituting the organic light emitting layer 155 of the multi-layer structure has a minimum thickness required for performing its role, 1), the organic light emitting layer 55 of FIG. 1 is formed of a hole injection layer (55a in FIG. 1), a hole transport layer (55b in FIG. 1), an organic light emitting material Layer structure including an electron injection layer (55e in FIG. 1), a quaternary layer in the electron transport layer (55d in FIG. 1), a quadrupole layer in the electron transport layer (55d in FIG. 1) or an electron transport layer (55d in FIG.

However, in the organic electroluminescent device 102 according to the modification of the embodiment of the present invention, the auxiliary layer 152 provided on the entire surface of the display region is a hole injection layer (55a in Fig. 1) The hole injection layer 55a of each light emitting region EA may be omitted.

In this case, the organic electroluminescent device 102 according to a modification of the embodiment of the present invention in which the hole injecting layer (not shown) is omitted has an organic light emitting layer 155 formed by ink jetting or nozzle dropping Layer structure of a hole transporting layer 155a, an organic light emitting material layer 155b and an electron transporting layer 155c or an electron injecting layer 155d on the electron transporting layer 155c The thickness of the organic light emitting layer 155 is reduced by omitting the hole injection layer, so that the filing up phenomenon of the organic light emitting layer 155 compared to the embodiment of the present invention or the conventional organic electroluminescence device (101 of FIG. 3 or 1 of FIG. 1) Effect can be realized.

When the pileup phenomenon of the organic light emitting layer 155 is reduced, the area of the organic light emitting layer 155 having a flat surface in the light emitting region EA surrounded by the bank 153 is increased, By expanding the region EA3, the aperture ratio and the luminance characteristic can be improved and the lifetime can be improved.

However, the hole injection layer (not shown) is not necessarily omitted and may be formed as an organic electroluminescent device 101 according to an embodiment of the present invention. In this case, the auxiliary layer 152 Injects holes into the electron transport layer 155a or the organic light emitting material layer 155b together with the hole injection layer 155e in FIG.

The structure of the organic electroluminescent device 102 according to the modification of the embodiment of the present invention having the above structure is not limited to the structure of the organic electroluminescent device according to the embodiment of the present invention The structure of the organic EL device 101 according to the embodiment of the present invention will be described with reference to FIG.

Meanwhile, in the organic electroluminescent device 101 according to the embodiment of the present invention having such a configuration, the organic light emitting layer 155 is formed by sequentially repeating the light emitting regions EA, , Or may be configured to emit white light for each of the entire light emitting regions EA. This is due to the material properties of the organic light emitting material layer 155b in the organic light emitting layer 155 of the multilayer structure.

The organic light emitting layer 155 is formed by spraying or dropping a liquid organic material through an ink jet device or a nozzle device, drying and curing the organic material.

Next, a second electrode 160 is formed on the entire surface of the display region on the organic light emitting layer 155.

The second electrode 160 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) Gold (Au), and aluminum magnesium alloy (AlMg), thereby serving as a cathode electrode.

In this case, the first electrode 150, the auxiliary layer 1520, the organic light emitting layer 155, and the second electrode 160, which are sequentially stacked on the light emitting region EA, form the organic light emitting diode E.

Meanwhile, a second substrate 170 for encapsulation is provided corresponding to the first substrate 110 of the organic electroluminescent device 101 according to the embodiment of the present invention.

The first substrate 110 and the second substrate 170 are provided with an adhesive agent (not shown) made of a sealant or a frit along an edge thereof. The adhesive agent (not shown) And the second substrate 170 is adhered to maintain the panel state. At this time, a vacuum state is formed between the first substrate 110 and the second substrate 170 which are spaced apart from each other, or an inert gas atmosphere may be obtained by being filled with an inert gas.

In this case, the second substrate 170 for the encapsulation may be made of plastic having a flexible property, or may be made of a glass substrate.

Meanwhile, although the organic EL device 101 according to the above-described embodiment includes the second substrate 170 for encapsulation in a state of being separated from the first substrate 110, The substrate 170 may be configured to contact the second electrode 160 provided on the uppermost layer of the first substrate 110 in the form of a film including an adhesive layer, A capping layer (not shown) may be formed by further providing an organic insulating layer (not shown) or an inorganic insulating layer (not shown). The organic insulating layer (not shown) or the inorganic insulating layer (not shown) (Not shown). In this case, the second substrate 170 may be omitted.

The organic electroluminescent device 101 according to the embodiment of the present invention having the above-described configuration and the modification 102 according to the present invention has hydrophilic characteristics over the entire surface of the display area, The auxiliary layer 152 made of a tungsten oxide (WO ₃ ) material having an excellent hole injection capability into the hole injection layer 155b or the hole transport layer 155a is provided so that the organic electroluminescence Up phenomenon in the vicinity of the bank 153 of the organic light emitting layer 155 formed using a liquid material as compared with the device (not shown) is reduced, so that the flat surface of the organic light emitting layer 155 in each light emitting region EA Emitting region EA3 increases as the area of the portion having the light emitting region EA2 increases.

Further, in the organic electroluminescent device 101 according to the embodiment of the present invention and the modified example thereof (102 in FIG. 4), the brightness of the organic luminescent layer 155 is improved by increasing the portion of the organic luminescent layer 155 having a flat surface in each luminescent region EA And has a uniform luminance characteristic as well as an effect of suppressing a face defect due to luminance unevenness and improving the display quality.

The embodiment of the present invention and the modified example of the organic EL device according to the present invention (101 of FIG. 4) reduce the filing up phenomenon in each light emitting region EA and improve the uniformity of the thickness of the organic light emitting layer 155 There is an effect that the deterioration of the organic light emitting layer 155 is suppressed and the service life is prolonged.

Furthermore, unlike an organic electroluminescent device (not shown) having a conventional two-end bank (not shown), the organic electroluminescent device 102 according to the modification of the embodiment of the present invention includes a bank having a single- There is no need to form the two-end bank. Therefore, the productivity per unit time is improved by simplifying the manufacturing process by omitting the masking process once, and the material cost is further reduced.

Hereinafter, an embodiment of the present invention having the above-described structure and a manufacturing method of an organic electroluminescent device according to a modification thereof will be described. Here, the organic electroluminescent device according to the embodiment of the present invention and its modifications is characterized by an auxiliary layer, a bank, and an organic light emitting layer provided on the first electrode of the organic electroluminescent diode, Since the switching and driving thin film transistors are manufactured by a general method, the description thereof will be omitted or simplified. For convenience of explanation, the manufacturing method of the organic electroluminescent device according to the modified example of the embodiment of the present invention is the same except for the manufacturing method of the organic electroluminescent device according to the embodiment of the present invention and the configuration in which the hole injecting layer is omitted The manufacturing method of the organic electroluminescent device according to the embodiment of the present invention will be mainly described, and only differences will be described briefly.

5A to 5J are cross-sectional views illustrating steps of manufacturing an organic electroluminescent device according to an embodiment of the present invention.

First, as shown in FIG. 5A, gate wirings (not shown) and data wirings (not shown) which intersect each other are formed on a transparent insulating material such as a first substrate 110 made of glass or plastic And a switching thin film transistor (not shown) connected to the gate and the data line (not shown) is formed, and at the same time, the switching thin film transistor (not shown) (Not shown) and a power supply wiring (not shown). Here, the structure of the switching and driving thin film transistor (not shown) (DTr) has been described in detail with reference to FIG. 3, and therefore detailed description thereof will be omitted.

5B, a planarization layer 140 having a flat surface is formed by applying an organic insulating material, for example, photoacrylic, on the switching and driving thin film transistor (not shown) (DTr) The drain contact hole 143 exposing the drain electrode 136 of the driving thin film transistor DTr is formed.

For example, silicon oxide (SiO ₂ ) or silicon nitride (SiN x) is deposited on the switching and driving thin film transistors (not shown) before forming the planarization layer 140 to protect The planarization layer 140 is formed on the protective layer (not shown), and the driving thin film transistor DTr is formed on the planarization layer 140 and the passivation layer (not shown) A drain contact hole 143 may be formed to expose the drain electrode 136 of the semiconductor substrate 100. [

Next, as shown in FIG. 5C, the driving thin film transistor DTr and the drain contact hole 143 are formed on the planarization layer 143 having the drain contact hole 143, To form a first electrode (150) that is in contact therewith.

The first electrode 150 may include a lower layer 150a made of a metal material having excellent reflectivity, such as aluminum (Al) or aluminum alloy (AlNd), and an indium-tin-oxide Layer structure of the top layer 150b made of indium-tin-oxide (ITO). However, the first electrode 150 may be formed of a single layer made of indium-tin-oxide (ITO) Structure.

Next, as shown in FIG. 5D, the first electrode 150 has a hydrophilic property by using any one of evaporation method and evaporation method through sputtering, and at the same time, Tungsten oxide (WO ₃ ) is deposited on the entire surface of the display region of the first substrate 110, which is a material having a high hole injection capability for efficiently injecting holes generated from the first electrode 150 into the organic light emitting material layer 155b, (Not shown).

At this time, since the auxiliary layer 152 does not need to be patterned for each light emitting region EA, a separate shadow mask or the like is not required even if the deposition is performed using the thermal evaporation method. Therefore, There is no room for pattern defects to occur, so that the deposition through the thermal deposition method is not problematic.

The auxiliary layer 152 is formed by a vapor deposition method. Unlike the case where the material of the liquid crystal using the ink jet device or the nozzle device is formed by jetting or dropping, the first electrode 150 ) And a flat surface.

Meanwhile, the auxiliary layer 152 deposited on the entire surface of the display area has a hydrophilic tendency due to the material properties thereof, so that the liquid organic material is injected or dropped onto the upper part of the auxiliary layer 152 through the ink jet device or the nozzle device And the auxiliary layer 152 has a function of injecting or supporting the electron injection layer 155e because the auxiliary layer 152 has a superior hole injecting ability and functions as the hole transport layer 155a or 155a, In the case of the organic electroluminescent device 102 according to the modification of the embodiment of the present invention (FIG. 4), instead of the hole injecting layer 155e, the hole injecting layer 155e injects holes into the organic light emitting material layer 155b. And serves as the injection layer 155e itself.

Next, as shown in FIG. 5E, a polyimide having a photosensitive property on the auxiliary layer 152 and having a hydrophobic property, for example, fluorine (F) A bank material layer (not shown) is formed by applying a mixed material of one or more of styrene, methyl mathacrylate, and polytetrafluoroethylene.

At this time, the bank material layer (not shown) may be formed so as to have a black color itself by further including black pigment or black resin.

Then, the bank material layer (not shown) having such a photosensitive characteristic is patterned to surround each light emitting region EA at the boundary of each light emitting region EA, A bank 153 having a monolayer structure in which the electrode 150 is overlapped with the edge of the electrode 150 and has a trapezoidal cross-sectional shape is formed.

Next, as shown in FIG. 5F, in the method of manufacturing the organic electroluminescent device (101 of FIG. 5J) according to the embodiment of the present invention, the bank 153 The laser beam LB using a laser irradiation device (not shown) is selectively irradiated onto the auxiliary layer 152 surrounded by the auxiliary layer 152 to crystallize the laser beam LB.

Here, the laser irradiator (not shown) is preferably an excimer laser beam irradiator which is irradiated with a pulsed laser beam LB having a relatively short wavelength of 248 nm to 1060 nm. This is because it is advantageous to minimize the laser processing time by irradiating the laser beam (LB) having a high energy density in a relatively short time.

The laser beam LB may have a line beam shape, or may have a pattern beam shape.

It is preferable that the laser beam LB is formed only on the auxiliary layer 152 exposed outside the bank 153 in each light emitting region EA surrounded by the bank 153, 152 form a crystallized first portion 152a where the laser beam LB is irradiated and a second portion 152b of amorphous state where the laser beam LB is not irradiated.

When the auxiliary layer 152 is crystallized, the auxiliary layer 152 is formed on the entire surface of the display region, and thus the auxiliary layer 152 is in contact with the adjacent luminescent regions EA State, the respective light emitting areas EA in the display area in this case can not smoothly realize a full-color image.

Therefore, in the auxiliary layer 152, the crystallization process through irradiation of the laser beam LB is preferably performed only on the auxiliary layer 152 exposed outside the bank 153.

If the bank 153 is formed of a black material, even if the laser beam LB is irradiated to the bank 153, the laser beam LB can not reach the portion where the auxiliary layer 152 is located And is not influenced by the laser beam LB irradiation. Therefore, in this case, the laser beam LB does not matter whether the laser beam LB or the line-type laser beam LB is patterned for each light emitting area EA.

When the auxiliary layer 152 is crystallized by irradiating the laser beam LB, the molecules in the auxiliary layer 152 become disordered amorphous state when the auxiliary layer 152 is deposited. In this case, The ability to inject holes into the hole transporting layer 155a or the organic light emitting material layer 155b becomes low and the hole transporting property is improved and the hole injecting ability is finally improved .

 Next, after the crystallization process of the auxiliary layer 152 is completed to form the first and second portions 152a and 152b, the ink jet apparatus 195 or the nozzle apparatus (not shown) A hole transporting material layer (not shown) in a liquid state is formed in each luminescent region EA by spraying or dropping a liquid hole transporting material using a spin coating method or a spin coating method, and then a heat treatment process is performed to dry and cure the hole transporting material layer A hole injection layer 155e is formed.

In this case, the hole injection layer 155e is improved in spreading ability due to the hydrophilic property of the auxiliary layer 152 in each light emitting region EA, so that the file up phenomenon in which the thickness of the hole injection layer 155e increases around the bank 153 is (Not shown) provided with a bank (not shown) of two stages of the organic EL element.

5H, the same method as that for forming the hole injection layer 155e is performed, and the light emitting region EA surrounded by the bank 153 of the single layer is formed on the hole injection layer 155e A hole transport layer 155a, an organic light emitting material layer 155b, an electron transport layer 155c, and an electron injection layer 155d are sequentially formed.

Layer structure of the hole injection layer 155e and the hole transport layer 155a, the organic light emitting material layer 155b and the electron transport layer 155c sequentially formed in the respective light emitting regions EA, When the layer 155d is further formed, an organic light emitting layer 155 having a five-layer structure is formed.

The organic light emitting layer 155 formed by jetting or dropping through the ink jet device or the nozzle device in this way generates a predetermined piling up phenomenon around the bank, but by forming the auxiliary layer 152 having hydrophilicity, The width of a portion where the pileup phenomenon occurs is significantly reduced in comparison with the organic electroluminescent device having the bank of the structure (1 in Fig. 1).

Meanwhile, in accordance with a modification of the embodiment of the present invention having the laminated structure difference of the organic light emitting layer 155 with respect to the organic electroluminescent device (101 of FIG. 5J) according to the embodiment of the present invention having the structure of the organic light emitting layer as described above 6A to 6D are cross-sectional views illustrating steps of manufacturing an organic electroluminescent device according to a modification of the embodiment of the present invention. FIGS. 6A to 6D show a method of forming an organic light emitting layer of the organic electroluminescent device (102 of FIG. A step of forming a second electrode and a step of providing a second substrate for encapsulation).

6A, after the crystallization process of the auxiliary layer 152 is completed and the first and second portions 152a and 152b are formed, the ink jet device 195 is formed on the auxiliary layer 152, A hole transporting material layer (not shown) in a liquid state is formed in each luminescent region EA by injecting or dropping a liquid hole transporting material using a nozzle device (not shown), and a heat treatment process is performed on the hole transporting material layer Followed by drying and curing to form a hole transporting layer 155a.

In this case, the hole transporting layer 155a is improved in spreading ability by the hydrophilic characteristic of the auxiliary layer 152 in each light emitting region EA, so that the file up phenomenon in which the thickness of the hole transporting layer 155a increases around the bank 153 (Not shown) provided with a bank (not shown) of two stages of the organic EL element.

6B, the light emitting region EA surrounded by the banks 153 of the single layer is sequentially formed on the hole transport layer 155a by the same method as the formation of the hole transport layer 155a, An organic light emitting material layer 155b, an electron transport layer 155c, and an electron injection layer 155d are formed.

The hole transport layer 155a, the organic light emitting material layer 155b, the electron transport layer 155c, and the electron injection layer 155d, which are sequentially stacked in the respective light emitting regions EA, form an organic light emitting layer 155 having a four- . At this time, the electron injection layer 155d may be omitted. In this case, the organic light emitting layer 155 has a triple or quadruple layer structure.

The organic light emitting layer 155 formed by jetting or dropping through the ink jet device or the nozzle device causes a predetermined filing up phenomenon around the bank 153. However, The number of stacked layers of the light emitting layer 155 itself is reduced, so that the width of the portion where the pileup phenomenon occurs compared to the conventional organic light emitting device is significantly reduced.

That is, the organic light emitting layer 155 includes a conventional hole transport layer (55a in FIG. 1) by forming the auxiliary layer 152 serving as a hole injection layer (55a in FIG. 1) (55b in FIG. 1), an organic light emitting material layer (55c in FIG. 1) and an electron transport layer (55d in FIG. 1) and / or an electron injection layer Layer is formed by jetting or dropping through the inkjet or nozzle device, the filing phenomenon can be further reduced due to the reduction in the layer formed in jetting or dropping.

6C and 6D and the second substrate 170 for encapsulation to complete the organic EL device 102, the process of the present invention can be applied to the process of forming the second electrode 160, Since the method of manufacturing the organic electroluminescent device according to the embodiment (101 of FIG. 5J) is the same as the method of manufacturing the organic electroluminescent device according to the embodiment of the present invention (FIG.

5I, a second electrode 160 is formed on the entire surface of the display region on the organic light emitting layer 155 through vacuum thermal deposition.

The first electrode 150 and the auxiliary layer 152, the organic light emitting layer 155, and the second electrode 160, which are sequentially stacked on the respective light emitting regions E, constitute an organic light emitting diode E.

Next, as shown in FIG. 5J, a film (not shown) or a capping film (not shown) is formed on the second electrode 160, or a second substrate 170 made of a transparent glass material or a plastic material is formed (Not shown) or a predetermined width of the edge of the first substrate 110 in an inert gas atmosphere or a vacuum atmosphere, the sealant pattern (not shown) Thereby completing the electroluminescent element 101.

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

101: Organic electroluminescent device
110: first substrate
113: semiconductor layer (113a: first region, 113b: second region)
116: gate insulating film
120: gate electrode
123: Interlayer insulating film
125: semiconductor layer contact hole
133: source electrode
136: drain electrode
140: planarization layer
143: drain contact hole
150: first electrode (150a: lower layer, 150b: upper layer)
152: auxiliary layer 152a (first portion, 152b: second portion)
153: Bank
(155e: hole transport layer, 155b: organic light emitting material layer, 155c: electron transport layer, 155d: electron injection layer)
160: Second electrode
170: second substrate
DTr: driving thin film transistor
E: Organic light emitting diode
EA: light emitting region
EA3: actual light emitting area
w2: the second width (size of the region between the light emitting region and the actual light emitting region)

Claims (12)

A display device comprising: a first substrate having a display region in which a plurality of light emitting regions are defined;
A first electrode provided for each of the plurality of light emitting regions;
An auxiliary layer formed on the entire surface of the display region over the first electrode and having a hydrophilic property and a hole injection capability;
A bank which overlaps the edge of the first electrode on the auxiliary layer and surrounds each of the plurality of light emitting regions;
An organic light emitting layer provided on the auxiliary layer in each of the plurality of light emitting regions surrounded by the banks;
And a second electrode provided on the entire surface of the display region above the organic light emitting layer.
The method according to claim 1,
Wherein the auxiliary layer is made of tungsten oxide (WO ₃ ).
3. The method of claim 2,
Wherein the auxiliary layer comprises a crystallized first portion corresponding to each of the light emitting regions, and a portion corresponding to the bank comprises an amorphous second portion.
The method according to claim 1,
Wherein the organic light emitting layer has a triple-layer structure of a hole transporting layer, an organic light emitting material layer and an electron transporting layer, or a quadruple layer structure of a hole transporting layer, an organic light emitting material layer, an electron transporting layer and an electron injecting layer.
5. The method of claim 4,
Wherein the organic light emitting layer further comprises a hole injecting layer between the auxiliary layer and the hole transporting layer.
The method according to claim 1,
A plurality of switching thin film transistors, a driving thin film transistor, and a planarization layer covering the switching and driving thin film transistor and exposing a drain electrode of the driving thin film transistor are provided under the first electrode on the first substrate, And one electrode is formed in contact with the drain electrode of the driving thin film transistor on the planarization layer.
Forming a first electrode for each of the plurality of light emitting regions on a first substrate having a display region in which a plurality of light emitting regions are defined;
Forming an auxiliary layer on the entire surface of the display region by depositing a material having a hydrophilic property and a hole injection capability on the first electrode;
Forming a bank overlying the auxiliary layer and overlying the edge of the first electrode and surrounding each of the plurality of light emitting regions;
Forming an organic light emitting layer by injecting or dropping a liquid material into the plurality of light emitting regions surrounded by the banks through the ink jet device or the nozzle device over the auxiliary layer;
Forming a second electrode on the entire surface of the display region 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 material having the hydrophilic property and the hole injecting capability is tungsten oxide (WO ₃ ), and the deposition is vacuum thermal deposition or sputtering.
9. The method of claim 8,
Wherein the organic light emitting layer is formed to have a three-layer structure of a hole transporting layer, an organic light emitting material layer and an electron transporting layer, or a four layer structure of a hole transporting layer, an organic light emitting material layer, an electron transporting layer, ≪ / RTI >
10. The method of claim 9,
And forming a hole injection layer on the auxiliary layer before forming the hole transport layer.
9. The method of claim 8,
The auxiliary layer exposed to the outside of the bank before forming the organic light emitting layer is irradiated with a laser beam to form a crystallized first portion and a portion corresponding to the bank is formed as a second portion of the amorphous state A method of manufacturing an organic electroluminescent device.
12. The method of claim 11,
Wherein the laser beam is a pulsed wave laser beam having a wavelength band of 248 nm to 1060 nm.

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