KR20040061988A - Hybrid Structure Organic Electroluminescent Device and method for fabricating the same - Google Patents

Abstract

PURPOSE: An organic electroluminescence device and a method for manufacturing the same are provided to achieve improved performance of organic electroluminescence device by applying a low molecular material to the organic electroluminescence device without a shadow mask process. CONSTITUTION: An organic electroluminescence device comprises a substrate(110) where red, green, and blue sub pixels(Pr,Pg,Pb) are defined; thin film transistors(T) formed on the substrate; a first electrode(124) connected to the thin film transistors and patterned in sub pixel units; a bank(130) having an open portion(126) for exposing the main region of the first electrode; a first carrier transport layer(132) formed in the sub pixel region through a solution state deposition; red and green light emitting layers(134a,134b) formed in the red and green sub pixel regions by using a polymer based light emitting material; a blue light emitting layer(135) automatically patterned by the bank, in the region covering the red and green light emitting layers through an evaporation process using a low molecular light emitting material; a second carrier transport layer(137) formed in the region covering the blue light emitting layer by using a low molecular material and automatically patterned by the bank; and a second electrode(138) formed all over the substrate covering the tank and the second carrier transport layer.

Description

Hybrid Structure Organic Electroluminescent Device and method for fabricating the same

The present invention relates to an organic electroluminescent device, and more particularly, to a hybrid structure organic electroluminescent device and a method of manufacturing the same.

Recently, a liquid crystal display device (LCD) has a light weight and low power consumption, and is currently used as a flat panel display (FPD).

However, the liquid crystal display is not a light emitting device but a light receiving device, and since there are technical limitations in brightness, contrast, viewing angle, and large area, efforts to develop a new flat panel display that can overcome these disadvantages are actively developed. It is becoming.

One of the new flat panel displays, the organic light emitting display device is self-luminous, and thus has a better viewing angle, contrast, and the like than the liquid crystal display device. In addition, since it is possible to drive DC low voltage, fast response speed, and all solid, it is strong against external shock, wide use temperature range, and especially inexpensive in terms of manufacturing cost.

In particular, unlike the liquid crystal display device or the plasma display panel (PDP), all of the deposition and encapsulation equipments are manufactured in the organic electroluminescent device manufacturing process. Therefore, the process is very simple.

Hereinafter, the basic structure and operation characteristics of the organic light emitting display device will be described in detail with reference to the drawings.

1 is a diagram illustrating a basic pixel structure of a general active matrix organic light emitting display device.

As shown, a scanning line is formed in a first direction, and a signal line and a power supply line are formed in a second direction crossing the first direction and spaced apart from each other by a predetermined distance. Define the pixel area.

A switching TFT, which is an addressing element, is formed at an intersection point of the scan line and the signal line, and is connected to the switching thin film transistor and the power supply line, and is referred to as storage capacitance (hereinafter referred to as C _ST) . ) Is formed, and is connected to the storage capacitance (C _ST ) and the power supply line to form a driving thin film transistor which is a current source element, and is connected to the driving thin film transistor to form an organic light emitting diode. ) Element is constructed.

When the organic light emitting diode device supplies a current to the organic light emitting material in a forward direction, a P (positive) -N (negative) junction between the anode, which is a hole providing layer, and a cathode, which is an electron providing layer, is formed. Since the electrons and holes are recombined with each other as they move, the electrons and holes have less energy than when the electrons and holes are separated from each other.

In order to manufacture such an organic electroluminescent device as a full-color product, red, green, and blue three-color light emitting materials are required. Conventionally, all three light emitting layers use high molecular light emitting materials or low molecular weight. Full color products were manufactured using the series light emitting materials.

Hereinafter, an organic electroluminescent device constituting a red, green, and blue light emitting layer by a conventional inkjet printing method will be described with reference to the drawings.

2 is a cross-sectional view of one pixel portion of an organic light emitting display device including a conventional light emitting layer.

As shown, the gate electrode 12 and the semiconductor layer 14 in subpixel units on the substrate 10 in which red, green, and blue subpixels Pr, Pg, and Pb, which are the smallest units for implementing the screen, are defined. ), A thin film transistor T formed of a source electrode 16 and a drain electrode 18, and a drain contact hole 20 partially exposing the drain electrode 18 in a region covering the thin film transistor T. The passivation layer 22 is formed, and the first electrode 24 connected to the drain electrode 18 through the drain contact hole 20 is formed on the passivation layer 22 and the subpixels Pr, Pg, and Pb. Patterned in units, the main region of the first electrode 24 is formed as an open portion 26 on the first electrode 24, and the buffer pattern 28 is formed in an area covering the edge portion of the first electrode 24. pattern) is formed, and columnar banks 30 (banks) are formed in the buffer pattern 28 region.

The red, green, and blue subpixels Pr, Pg, and Pb form one pixel P.

That is, the buffer pattern 28 and the bank 30 are formed at positions surrounding the boundary portions of the red, green, and blue subpixels Pr, Pg, and Pb regions, and the red, green, and red portions are formed using the bank 30 as a boundary portion. In the blue subpixels Pr, Pg, and Pb, the first carrier transfer layer 32, the light emitting layer 34, and the second carrier transfer layer 36 are sequentially formed.

The first carrier transfer layer 32, the light emitting layer 34, and the second carrier transfer layer 36 are made of a polymeric material, using a solution state coating method such as inkjet printing. The light emitting layer 34 has a structure in which the red, green, and blue light emitting layers 34a, 34b, and 34c are sequentially arranged for each of the red, green, and blue subpixels Pr, Pg, and Pb.

A second electrode 38 is formed on the entire surface of the substrate covering the second carrier transfer layer 36 and the bank 30.

Although not shown in detail in the drawings, when the first electrode 24 corresponds to an anode and the second electrode 38 corresponds to a cathode, the first carrier transport layer 32 is formed of a hole-transport layer. The second carrier transport layer 36 is made of an electron-transport layer.

The organic electroluminescent device including the polymer-based light emitting layer has a problem in that its lifespan is considerably shorter than that of other colors (red, green). (On the drawing, blue light emitting layer 34c)

It is analyzed that impurities are generated due to molecular defects of the polymer blue light emitting material and appear to decrease the luminous efficiency of the color.

In addition, in the case of an organic electroluminescent device product including a low molecular weight light emitting layer formed by a shadow mask method using thermal evaporation, the shadow mask method has a low utilization rate of the light emitting material, There is a problem that it is difficult to cope with a large-area substrate required at the time of production.

In order to solve the above problems, an object of the present invention is to provide an organic electroluminescent device having a structure that can be easily applied to a large area substrate while solving the problem of a specific color defect of the polymer-based organic field material.

To this end, the present invention proposes a hybrid structure having both a polymer light emitting layer and a low molecular light emitting layer.

In addition, when the polymer light emitting layer is formed in the corresponding color subpixel region by the inkjet printing method, and the color low molecular emission layer is formed by the thermal evaporation method without a separate shadow mask process in the blue subpixel region as an example, the inkjet printing method is applied to the color subpixel region. As the banks used are automatically separated by subpixels, the patterning may be automatically performed by subpixels. Accordingly, a separate shadow mask process may be omitted, thereby easily applying to a large area substrate.

In addition, the second carrier transport layer formed on the low molecular light emitting layer may be automatically patterned by the same method as the low molecular light emitting layer using a low molecular material, wherein the second carrier transport layer made of the low molecular material is non-luminescent It is important to select from materials with properties so as not to affect the picture quality characteristics of the red and green subpixel regions.

1 is a view showing a basic pixel structure of a general active matrix organic electroluminescent device.

2 is a cross-sectional view of one pixel portion of an organic light emitting display device including a conventional light emitting layer.

3 is a cross-sectional view of one pixel portion of a hybrid structured organic light emitting display device according to a first embodiment of the present invention;

4A, 4B, 5A, and 5B are diagrams for describing image quality characteristics according to whether light emitting characteristics of the low molecular carrier transport layer material used in FIG. 3 exist, and FIGS. 4A and 5A are low molecular carrier transport layer materials having light emission characteristics. Spectral graphs showing the color characteristics of the red light emitting layer when applied and the color coordinates thereof, respectively, Figures 4b and 5b are spectrum graphs showing the color characteristics of the red light emitting layer when applying a low molecular carrier transport layer material having a non-luminescent properties And color coordinate characteristics thereof.

<Explanation of symbols for main parts of drawing>

110 substrate 112 gate electrode

114: semiconductor layer 116: source electrode

118: drain electrode 120: drain contact hole

122: protective layer 124: first electrode

126: open section 128: buffer pattern

130: bank 132: first carrier transport layer

134a, 134b, 134c: red, green, blue light emitting layer

134: light emitting layer 135: blue light emitting material layer

136: second carrier transport layer 137: second carrier transport layer

138: second electrode P: pixel

Pr, Pg, Pb: Red, Green, Blue Subpixel

In order to achieve the above object, a first aspect of the present invention provides a display device comprising: a substrate in which red, green, and blue subpixel regions, which are minimum units for implementing a screen, are defined; A thin film transistor formed on the substrate in subpixel units; A first electrode connected to the thin film transistor and patterned in subpixel units; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed in a solution state coating manner in the subpixel region with the bank as a boundary; A red and green light emitting layer formed in the same manner as the first carrier transfer layer using a polymer light emitting material in the red and green subpixel regions with the bank as a boundary; A blue light emitting material layer which is automatically patterned in subpixel units by the bank in an area covering the red and green light emitting layers by an evaporation process using a low molecular weight light emitting material; The blue light emitting material layer positioned in the blue subpixel region forms a blue light emitting layer, and the red, green, and blue light emitting layers form a hybrid structure light emitting layer including both a polymer light emitting layer and a low molecular light emitting layer. A second carrier transport layer formed by the same process as the blue light emitting material layer using a low molecular weight light emitting material, and automatically patterned in subpixel units by the bank; Provided is a hybrid structured organic electroluminescent device comprising a second electrode formed on a front surface of a substrate covering the bank and the second carrier transfer layer.

According to a second aspect of the present invention, there is provided a semiconductor device comprising: a substrate in which red, green, and blue subpixel regions, which are smallest units for implementing a screen, are defined; A first electrode formed on the substrate; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed by a solution coating method using a polymeric material in the subpixel region with the bank as a boundary; A red and green light emitting layer formed in the same manner as the first carrier transfer layer using a polymer light emitting material in the red and green subpixel regions with the bank as a boundary; A blue light emitting material layer which is automatically patterned in subpixel units by the bank in a region covering the red and green light emitting layers by a deposition process using a low molecular weight light emitting material; The blue light emitting material layer positioned in the blue subpixel region forms a blue light emitting layer, and the red, green, and blue light emitting layers form a hybrid structured light emitting layer including both a polymer light emitting layer and a low molecular light emitting layer, and in the region covering the light emitting layer, a low molecular weight A second carrier transport layer formed using the light emitting material by the same process as the blue light emitting material layer and automatically patterned in subpixel units by the bank; Provided is a hybrid structured organic electroluminescent device comprising a second electrode formed on a front surface of a substrate covering the bank and the second carrier transfer layer.

According to a third aspect of the present invention, there is provided a semiconductor device comprising: a substrate in which red, green, and blue subpixel regions, which are smallest units for implementing a screen, are defined; A thin film transistor formed on the substrate in subpixel units; A first electrode connected to the thin film transistor and patterned in subpixel units; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed by a solution coating method using a polymer material in the subpixel region with the bank as a boundary; The bank is positioned at two subpixel regions of the red, green, and blue subpixel regions, and is positioned at the first and second light emitting material layers made of a polymer light emitting material and another subpixel region. A hybrid structure light emitting layer comprising a third light emitting material layer made of a low molecular weight light emitting material; A second carrier transfer layer formed in the region covering the light emitting layer by the same process as the third light emitting material layer using a low molecular weight light emitting material, and automatically patterned in subpixel units by the bank; Provided is a hybrid structured organic electroluminescent device comprising a second electrode formed on a front surface of a substrate covering the bank and the second carrier transfer layer.

According to a fourth aspect of the present invention, there is provided a semiconductor device comprising: a substrate in which red, green, and blue subpixel regions, which are the smallest units for implementing a screen, are defined; A first electrode formed on the substrate; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed by a solution coating method using a polymer material in the subpixel region with the bank as a boundary; The bank is positioned at two subpixel regions of the red, green, and blue subpixel regions, and is positioned at the first and second light emitting material layers made of a polymer light emitting material and another subpixel region. A hybrid structure light emitting layer comprising a third light emitting material layer made of a low molecular weight light emitting material; A second carrier transfer layer formed in a region covering the light emitting layer by a process similar to the second light emitting material layer using a low molecular weight light emitting material, and automatically patterned in subpixel units by the bank; Provided is a hybrid structured organic electroluminescent device comprising a second electrode formed on a front surface of a substrate covering the bank and the second carrier transfer layer.

In the first to fourth aspects of the present invention, the low molecular weight material forming the second carrier transport layer is selected from low molecular weight materials having non-luminescent properties, and between the first electrode and the bank, the main portion of the first electrode The display device may further include a buffer pattern formed on an area covering the edge of the first electrode, and the polymer light emitting material is formed by an inkjet printing method.

In the first to fourth aspects of the invention, the first electrode is an anode, the second electrode is a cathode, and the first carrier transport layer is a hole-transport layer. The second carrier transport layer is an electron transport layer, a hole injection layer and an electron injection layer between a first electrode and a hole transport layer, between the electron transport layer and a second electrode. and an injection layer), respectively.

The blue light emitting material layer according to the first and second features of the present invention is deposited by a thermal deposition method, and the third light emitting material layer according to the third and fourth features of the present invention is the blue sub The blue light emitting material layer is formed in the pixel area, the third light emitting material layer is characterized in that the deposition by the thermal deposition method (Thermal deposition method).

The thin film transistor according to the first and third aspects of the present invention includes a gate electrode, a source electrode, and a drain electrode, and a protective layer having a drain contact hole exposing the drain electrode partially in a region covering the thin film transistor. And the first electrode is connected to the thin film transistor in such a manner as to be in contact with the drain electrode through the drain contact hole.

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

First Embodiment

3 is a cross-sectional view of one pixel portion of the hybrid structured organic light emitting display device according to the first embodiment of the present invention.

As illustrated, the gate electrode 112 and the semiconductor layer may be formed on a substrate 110 in which red, green, and blue subpixels Pr, Pg, and Pb, which are the smallest units for implementing the screen, are defined. 114, a thin film transistor T including a source electrode 116 and a drain electrode 118 is formed, and a drain contact hole 120 partially exposing the drain electrode 118 in a region covering the thin film transistor T. The passivation layer 122 is formed, and the first electrode 124 connected to the drain electrode 118 through the drain contact hole 120 has red, green, and blue subpixels on the passivation layer 122. Patterned in units of Pr, Pg, and Pb, the first electrode 124 has an open portion 126 that exposes a main region of the first electrode 124, and covers an edge portion of the first electrode 124. A buffer pattern 128 is formed in the region, and a columnar bank 130 is formed in an upper portion of the position corresponding to the buffer pattern 128. All.

The red, green, and blue subpixels Pr, Pg, and Pb form one pixel P.

The buffer pattern 128 serves to prevent field distortion at an edge part of the first electrode 124.

The buffer pattern 128 and the bank 130 are formed at positions surrounding boundaries of red, green, and blue subpixel regions Pr, Pg, and Pb, and the red, green, and blue patterns are formed using the bank 130 as a boundary. A first carrier transfer layer 132 made of a polymer material is formed in the subpixel regions Pr, Pg, and Pb, and an upper portion of the first carrier transfer layer 132 of the red and green subpixel regions Pr and Pg. Red and green light emitting layers 134a and 134b are formed therein.

In addition, by using the low molecular blue light emitting material, the red and green and blue subpixels Pr, Pg, and Pb are automatically formed on the front surface of the substrate covering the red and green light emitting layers 134a and 134b by the bank 130. Separately, a blue light emitting material layer 135 is formed.

In this case, the blue light emitting material layer positioned in the blue subpixel Pb region forms the blue light emitting layer 134a.

The blue light emitting material layer 135 is formed by depositing the entire surface on the substrate by thermal deposition without a separate shadow mask process.

The red, green, and blue light emitting layers 134a, 134b, and 134c constitute the light emitting layer 134, and the light emitting layer 134 is formed of the red, green light emitting layers 134a and 134b made of a polymer light emitting material, and a low molecular weight light emitting material. It is made of a blue light emitting layer 134c, in particular, the low molecular weight light emitting material is characterized in that it has a hybrid structure that is automatically patterned by the bank 130 without a separate shadow mask process.

In addition, a second carrier transfer layer 136 made of a low molecular weight material is automatically separated from the bank 130 on the front surface of the substrate above the blue light emitting layer 134c, and thus red, green, and blue subpixels Pr, Pg, and Pb are formed. It is formed for each area.

The second carrier transfer layer 136 is formed by an automatic patterning method without a separate shadow mask process by thermal deposition in the same manner as the blue light emitting layer 134c.

In addition, the low molecular weight material constituting the second carrier transport layer 136 is preferably selected from a non-luminescent low molecular weight material, and a detailed description thereof will be described later with reference to FIGS. 4A, 4B, 5A, and 5B. do.

The second electrode 138 is formed in an area that covers the bank 130 and the second carrier transfer layer 136.

Substantially, the second electrode 138 is formed on the bank 130 in a state in which the blue light emitting material layer 135 and the second carrier transport material layer 137 are sequentially stacked without subpixels.

The second electrode 138 is formed to have a sense of thickness to form an integrated pattern without being automatically separated by the bank 130, and the blue light emitting material layer 135 and the second carrier transport material layer 137. It is preferable that it is formed by the thermal evaporation method as).

Although not shown in detail in the drawings, when the first electrode 124 corresponds to an anode and the second electrode 138 corresponds to a cathode, the first carrier transport layer 132 is formed of a hole-transport layer. The second carrier transport layer 36 is made of an electron-transport layer.

In order to inject holes and electrons more efficiently, a hole injection layer and an electron injection layer are formed between the first electrode 124 and the hole transport layer, and between the electron transport layer and the second electrode 138. Each may further include).

The hybrid structured organic light emitting display device according to the present invention is applicable to a passive method in which a separate thin film transistor is omitted in addition to the active matrix method shown in this embodiment.

4A, 4B, 5A, and 5B are diagrams for describing image quality characteristics according to whether light emitting characteristics of the low molecular carrier transport layer material used in FIG. 3 exist, and FIGS. 4A and 5A are low molecular carrier transport layer materials having light emission characteristics. Spectral graphs showing the color characteristics of the red light emitting layer when applied and the color coordinates thereof, respectively, Figures 4b and 5b are spectrum graphs showing the color characteristics of the red light emitting layer when applying a low molecular carrier transport layer material having a non-luminescent properties And the color coordinate characteristics thereof, respectively, a peak of about 520 nm in FIG. 4A acts as a color interference in the region "I" as shown in FIG. 5A, thereby degrading the red color characteristic. .

This phenomenon, in the hybrid structure according to the present embodiment is formed of a red, green light emitting layer using a polymer light emitting material, and the blue light emitting material layer and the second carrier transport layer made of a low molecular weight light emitting material on the red, green light emitting layer As the structure is deposited in turn, due to the light emission characteristics of the low molecular weight light emitting material layer as well as the low molecular weight second carrier transport layer, the original red, green color is affected.

Therefore, when the low molecular weight second carrier transport layer is selected from a material having non-luminescent properties, the peaks in the same wavelength region as in FIG. 4A as shown in FIGS. 4B and 5B appear in the region “II” of FIG. Since the "II" area is included in the red color area, the red color property is not affected.

However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

As an example, in the hybrid structured organic electroluminescent device according to the present invention, the low molecular light emitting layer is not limited to the blue light emitting layer.

As described above, according to the hybrid structured organic electroluminescent device according to the present invention, by introducing a low molecular weight material into the organic electroluminescent device using a polymer material without a separate shadow mask process, it is possible to improve the performance of the organic electroluminescent device product. In addition, it is possible to realize a high service life, can be easily applied to a large area substrate, has the advantage of increasing the product competitiveness.

Claims (12)

A substrate in which red, green, and blue subpixel regions, which are the smallest units for implementing the screen, are defined; A thin film transistor formed on the substrate in subpixel units; A first electrode connected to the thin film transistor and patterned in subpixel units; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed in a solution state coating manner in the subpixel region with the bank as a boundary; A red and green light emitting layer formed in the same manner as the first carrier transfer layer using a polymer light emitting material in the red and green subpixel regions with the bank as a boundary; A blue light emitting material layer which is automatically patterned in subpixel units by the bank in an area covering the red and green light emitting layers by an evaporation process using a low molecular weight light emitting material; The blue light emitting material layer positioned in the blue subpixel region forms a blue light emitting layer, and the red, green, and blue light emitting layers form a hybrid structure light emitting layer including both a polymer light emitting layer and a low molecular light emitting layer. A second carrier transport layer formed by the same process as the blue light emitting material layer using a low molecular weight light emitting material, and automatically patterned in subpixel units by the bank; A second electrode formed on the front surface of the substrate covering the bank and the second carrier transfer layer; Hybrid structure organic electroluminescent device comprising a. A substrate in which red, green, and blue subpixel regions, which are the smallest units for implementing the screen, are defined; A first electrode formed on the substrate; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed by a solution coating method using a polymer material in the subpixel region with the bank as a boundary; A red and green light emitting layer formed in the same manner as the first carrier transfer layer using a polymer light emitting material in the red and green subpixel regions with the bank as a boundary; A blue light emitting material layer which is automatically patterned in subpixel units by the bank in a region covering the red and green light emitting layers by a deposition process using a low molecular weight light emitting material; The blue light emitting material layer positioned in the blue subpixel region forms a blue light emitting layer, and the red, green, and blue light emitting layers form a hybrid structured light emitting layer including both a polymer light emitting layer and a low molecular light emitting layer, and in the region covering the light emitting layer, a low molecular weight A second carrier transport layer formed using the light emitting material by the same process as the blue light emitting material layer and automatically patterned in subpixel units by the bank; A second electrode formed on the front surface of the substrate covering the bank and the second carrier transfer layer; Hybrid structure organic electroluminescent device comprising a. A substrate in which red, green, and blue subpixel regions, which are the smallest units for implementing the screen, are defined; A thin film transistor formed on the substrate in subpixel units; A first electrode connected to the thin film transistor and patterned in subpixel units; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed by a solution coating method using a polymer material in the subpixel region with the bank as a boundary; The bank is positioned at two subpixel regions of the red, green, and blue subpixel regions, and is positioned at the first and second light emitting material layers made of a polymer light emitting material and another subpixel region. A hybrid structure light emitting layer comprising a third light emitting material layer made of a low molecular weight light emitting material; A second carrier transfer layer formed in the region covering the light emitting layer by the same process as the third light emitting material layer using a low molecular weight light emitting material, and automatically patterned in subpixel units by the bank; A second electrode formed on the front surface of the substrate covering the bank and the second carrier transfer layer; Hybrid structure organic electroluminescent device comprising a. A substrate in which red, green, and blue subpixel regions, which are the smallest units for implementing the screen, are defined; A first electrode formed on the substrate; A columnar bank having an open portion exposing a main region of the first electrode, the column-shaped bank being formed at a boundary portion of each subpixel region; A first carrier transfer layer formed by a solution coating method using a polymer material in the subpixel region with the bank as a boundary; The bank is positioned at two subpixel regions of the red, green, and blue subpixel regions, and is positioned at the first and second light emitting material layers made of a polymer light emitting material and another subpixel region. A hybrid structure light emitting layer comprising a third light emitting material layer made of a low molecular weight light emitting material; A second carrier transfer layer formed in a region covering the light emitting layer by a process similar to the second light emitting material layer using a low molecular weight light emitting material, and automatically patterned in subpixel units by the bank; A second electrode formed on the front surface of the substrate covering the bank and the second carrier transfer layer; Hybrid structure organic electroluminescent device comprising a. The method according to any one of claims 1 to 4, The low molecular weight material forming the second carrier transport layer is a hybrid structured organic light emitting display device selected from low molecular weight materials having non-luminescent properties. The method according to any one of claims 1 to 4, And a buffer pattern formed between the first electrode and the bank, the main region of the first electrode being an open portion, and a buffer pattern formed in an area covering the edge of the first electrode. The method according to any one of claims 1 to 4, The polymer light emitting material is a hybrid structure organic light emitting device formed by inkjet printing (inkjet printing) method. The method according to any one of claims 1 to 4, The first electrode is an anode, the second electrode is a cathode, the first carrier transport layer is a hole transport layer, and the second carrier transport layer is an electron transport layer. Hybrid structure organic electroluminescent device which is (Electron-Transport Layer). The method of claim 8, And a hole injection layer and an electron injection layer, respectively, between the first electrode and the hole transport layer and between the electron transport layer and the second electrode. The method according to claim 1 or 2, The blue light emitting material layer is a hybrid structure organic electroluminescent device is deposited by a thermal deposition method (Thermal deposition method). The method according to any one of claims 3 to 4, The third light emitting material layer is a blue light emitting material layer formed in the blue subpixel region, and the third light emitting material layer is deposited by a thermal deposition method (Thermal deposition method). The method according to any one of claims 1 to 3, The thin film transistor includes a gate electrode, a source electrode and a drain electrode, and a protective layer having a drain contact hole exposing the drain electrode is partially formed in an area covering the thin film transistor, and the first electrode is substantially And a hybrid structure organic light emitting diode connected to the thin film transistor in a manner of being in contact with the drain electrode through the drain contact hole.