KR101097789B1 - Organic electroluminescence device having muti-electroluminescence layer and method for rabricating the same - Google Patents

Abstract

The present invention relates to an organic light emitting display device having a plurality of light emitting layers and a method of manufacturing the same, wherein a first substrate on which an organic light emitting display device is formed and a second substrate on which a driving transistor is manufactured are separately configured. In the electroluminescent display device, two light emitting layers are connected to each other in parallel to increase brightness and maximize the formation area of the light emitting layer per unit area, thereby increasing the brightness and efficiency of the organic light emitting display device.

An organic light emitting display device, a plurality of organic layers, a first positive electrode and a second positive electrode

Description

An organic light emitting display device having a plurality of light emitting layers, and a method of manufacturing the same {ORGANIC ELECTROLUMINESCENCE DEVICE HAVING MUTI-ELECTROLUMINESCENCE LAYER AND METHOD FOR RABRICATING THE SAME}

1 is a conceptual diagram showing the structure of a general organic light emitting display device.

2 is a circuit diagram of a unit pixel of a general organic light emitting display device.

3 is a cross-sectional view showing the structure of a general organic light emitting display device.

4 is a conceptual diagram showing the structure of an organic light emitting display device according to the present invention;

5A is a plan view showing the structure of an organic light emitting display device according to the present invention;

5B is a cross-sectional view illustrating a structure of an organic light emitting display device of the present invention.

6a to 6e are water flow diagrams illustrating a manufacturing process of the organic light emitting display device of the present invention.

7 is a cross-sectional view showing the contact between the organic light emitting display device and the driving transistor of the present invention.

***** Explanation of symbols for main parts of drawing *****

401: first positive electrode 402: second positive electrode

403: negative electrode 404: first organic layer

405: second organic layer 404a, 405e: hole injection layer

404b, 405d: hole transport layer 404c, 405c: light emitting layer

404d and 405b: electron transport layer 404e and 405a: electron injection layer

420: common voltage supply wiring 410: contact pad

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an organic electroluminescent device (Organic Electroluminescence) and a method of manufacturing the same, and more particularly, to an organic EL display device having a plurality of organic light emitting layers formed on a cover glass and a method of manufacturing the same. .

It is expected that the 21st century will be an information society, and accordingly, it is important to develop a high performance flat panel display device for multimedia because it is necessary to easily obtain information from anywhere. In particular, technology development related to device development of semiconductors and display devices in relation to communication and computers is becoming important, and one of the devices that are attracting attention as a color display device is an organic EL.

The organic EL display can be classified into a passive matrix organic light emitting device (PMOLED) and an active organic organic light emitting device (AMOLED) according to its structure. As is required, the development of AMOLED is essential.

An electroluminescent display (ELD) is a self-luminous display device that electrically excites fluorescent organic compounds to emit light, and has an advantage of being capable of driving at a low driving voltage and manufacturing a thin film. In addition, since the problems in the liquid crystal display (LCD) such as wide viewing angle, response speed, etc. can be solved, it is attracting attention as a next generation display device.

Hereinafter, the operation principle of the organic light emitting diode will be described.

Electrons supplied from the power source move to the light emitting layer through the cathode with the help of the electron transport layer, while holes in the anode move to the light emitting layer with the help of the hole transport layer. The electrons and holes combine with each other in the organic light emitting layer to form excitons, and the excitons fall into a low energy state to emit light.

The generated light may vary in color depending on what is an organic material, and may implement a natural color by using an organic material that emits red, green, and blue light.

Looking at the structure of the organic ELD, the organic ELD may be largely divided into a single layer and a multi-layer. The single layer has a structure in which one light emitting layer is formed as an organic layer between the positive electrode and the negative electrode, and the multilayer has a structure in which a plurality of organic layers including a light emitting layer are formed between the positive electrode and the negative electrode.

Among organic ELDs, multilayer organic ELDs are widely used, in which carriers are not directly injected into the light emitting layer to lower driving voltages.

Hereinafter, a structure of an organic ELD having a multilayer will be described with reference to FIG. 1.

In the organic ELD, an organic EL layer is formed between two electrodes. The two electrodes are a positive electrode 102 and a negative electrode 101, and an organic EL layer 110 is formed between the two electrodes.

The positive electrode 102 is mainly composed of a transparent electrode such as indium tin oxide (IT0), and the negative electrode 101 is composed of a metal thin film such as aluminum to reflect light generated in the light emitting layer in one direction. give.

On the other hand, holes are supplied to the light emitting layer 104 through the positive electrode 102, and electrons are supplied to the light emitting layer 104 through the negative electrode 101.

The organic EL layer 110 includes an electron transfer layer 103 formed on the light emitting layer 104 and the negative electrode 101, and a hole transport layer formed between the light emitting layer 104 and the positive electrode 102. transfer layer) 105 and a light emitting layer 104.

The organic EL layer 110 is formed on a substrate 107 such as transparent glass. On the substrate, unit pixels in a matrix arrangement are formed, and organic EL elements having the above structure are formed in each unit pixel.

In the multilayer organic ELD, the organic EL layer may include more organic film layers, and further include an electron injection layer and a hole injection layer to lower the driving voltage.

Hereinafter, a basic circuit diagram of an organic light emitting display device constructed by the above principle will be described with reference to FIG. 2.

M x N unit pixels are defined in the array substrate, and each unit pixel has a matrix arrangement.

Each unit pixel 210 includes a switching thin film transistor 220, a driving thin film transistor 230, a capacitor 240, and an organic light emitting element 250 that receives a signal from the driving thin film transistor 230. .

In the switching thin film transistor 220, a scan signal is input to a gate through a gate line 212, and a data signal is input to a source through a data line 214. The gate electrode of the driving transistor 230 is connected to the drain electrode.

In addition, the driving transistor 230 has a source electrode connected to the first power supply terminal Vdd of the first power line 216, a drain electrode connected to the anode of the organic light emitting diode 250, and the organic light emitting diode 250. ) Is connected to the second power supply terminal (Vss).

The organic light emitting diode 250 includes at least one organic layer including an organic light emitting layer.

3 illustrates the structure of an organic light emitting diode that is substantially formed on an array substrate and a driving thin film transistor that applies a signal to the organic light emitting diode.

Referring to FIG. 3, the organic light emitting diode includes a thin film transistor, an organic light emitting diode, and a capacitor.

Although only one thin film transistor is shown in FIG. 3, substantially two or four thin film transistors are formed per unit pixel.

The thin film transistor includes an active layer 320 and source / drain electrodes 360/350, and a gate insulating layer 323 is formed between the gate electrode 330 and the active layer 320 to insulate them. . In addition, source and drain regions 323B and 323A doped with a high concentration of impurities are formed at both edges of the active layer 320, all of which are formed on the buffer layer 301 formed on the transparent substrate 300. The drain electrode 350 and the source electrode 360 are connected to the drain region 323A and the source region 323B of the active layer 320, respectively.                         

The organic light emitting diode is composed of a negative electrode (cathode, 360) connected to the drain electrode 150, a positive electrode (anode, 370) formed on the uppermost layer of the substrate, and an organic light emitting layer 372 formed between the two layers The organic light emitting layer 372 is composed of a plurality of organic films. When the organic light emitting layer 372 is formed of a multilayer, the organic light emitting layer may be formed of an electron injecting layer, an electron transporting layer, an organic light emitting layer, a hole injecting layer, and a hole transporting layer. hole transporting layer).

The capacitor is formed by the power line 340 connected to the lower electrode 321 and the source electrode 360 which are formed together when the active layer 320 is formed, and the first insulating layer 325 formed between the two electrodes. do. The first and second insulating layers 325 and 327, the passivation layer 328, and a third insulating layer formed on the capacitor are further formed below the positive electrode 375. The positive electrode 370 is made of a transparent conductive material such as ITO.

In the conventional organic light emitting display device, since the thin film transistor and the organic light emitting element are formed together on the array substrate, two or four thin film transistors are formed in one unit pixel, and the organic light emitting layer is formed in the remaining area. The area in which the organic light emitting layer for providing light is to be formed is reduced and causes the brightness of the organic light emitting display device to be reduced.

In addition, since the light emitting layer formed on the array substrate generally includes one light emitting layer, the light emitting efficiency may be reduced.

 Therefore, an object of the present invention is to increase the luminous efficiency by forming an organic light emitting device having a plurality of organic light emitting layers for each unit pixel of an organic light emitting display device. In addition, in order to increase the formation area of the organic light emitting device, the organic light emitting display device according to the present invention is manufactured by forming an array substrate on which a thin film transistor is formed and an upper substrate on which the organic light emitting layer is formed and proceeding the bonding step, thereby forming organic per unit pixels. It is an object to maximize the area of the light emitting layer to increase the luminance.

The organic light emitting display device of the present invention for the above purpose is a first substrate; A first positive electrode formed on each of the unit pixels in a matrix arrangement on the first substrate; A first organic layer formed on the first positive electrode and including a first light emitting layer; A negative electrode formed on the first organic layer; A second organic layer formed on the negative electrode and including a second light emitting layer; A second positive electrode formed on the second organic layer; A second substrate; And a driving transistor arranged in a matrix on the second substrate and electrically connected to the negative electrode.

In addition, the organic light emitting display device according to the present invention comprises: a first substrate having an organic light emitting display device having a plurality of organic layers formed for each unit pixel; A driving transistor electrically connected to the organic light emitting diode is formed for each unit pixel, and the second substrate constituting the matrix array is bonded to each other.

In addition, the manufacturing method of the organic light emitting display device of the present invention comprises the steps of forming a first positive electrode which is formed for each unit pixel in a matrix arrangement on the first substrate and electrically connected to each other; Forming a first organic layer including a light emitting layer on the first positive electrode; Forming a transparent negative electrode on the first organic layer; Forming a second organic layer including a light emitting layer on the negative electrode; Forming a second positive electrode on the second organic layer; And bonding a second substrate corresponding to the first substrate and electrically connected to the negative electrode to a second substrate formed for each unit pixel of matrix array, so that the negative electrode and the driving transistor are electrically connected to each other. Characterized in that it comprises a.

The present invention is characterized in that the organic light emitting display device includes a plurality of light emitting layers in forming an organic light emitting display device. By providing a plurality of light emitting layers, the organic light emitting display device can exhibit excellent luminance compared to the organic light emitting display device having one light emitting layer.

In addition, the organic light emitting display device of the present invention is configured to reduce the driving voltage while improving luminance by configuring the organic light emitting display device in which the light emitting layers are connected in parallel in forming the plurality of organic light emitting display devices. .

In addition, the organic light emitting display device of the present invention increases the area in which the light emitting layer can be formed per unit pixel by forming an organic light emitting display device on a top plate separate from the array substrate on which the driving transistor is formed, thereby increasing the brightness of the organic light emitting display device. Can be improved.

In addition, the organic light emitting display device according to the present invention forms a contact pad contacting the driving transistor for each unit pixel of the upper plate, and connects the contact pad and the negative electrode to connect the organic light emitting display device formed on the separate substrate with the driving transistor. Easy to configure

Hereinafter, a concept of the structure of the organic light emitting display device according to an embodiment of the present invention will be described with reference to FIG. 4.

The present invention constitutes a plurality of organic light emitting diodes on a separate first substrate bonded to an array substrate on which a switching thin film transistor and a driving thin film transistor are formed.

An organic light emitting display device described with reference to FIG. 4 is formed on the first substrate.

Referring to FIG. 4, the organic light emitting display device of the present invention includes two positive electrodes 401 and 402 facing each other and a negative electrode 403 formed therebetween.

The positive electrode includes a first positive electrode 401 and a second positive electrode 402 into which holes are injected, and a first organic layer 404 is formed between the first positive electrode 401 and the negative electrode 403. The second organic layer 405 is formed between the negative electrode 403 and the second positive electrode 402.

The first organic layer 404 includes a hole injection layer 404a, a hole transport layer 404b, a first light emitting layer 404c, an electron transport layer 404d, and an electron injection layer in contact with the first positive electrode 401. 404e is sequentially stacked, and the second organic layer 405 includes an electron injection layer 405a, an electron transport layer 405b, a second emission layer 405c, and a hole contacting the negative electrode 403. The transport layer 405d and the hole injection layer 405e are stacked in this order.

Looking at the organic electroluminescent device of the present invention in more detail, the first positive electrode 401 may be formed by depositing a thin metal film such as aluminum, magnesium, calcium, and the like on the transparent conductive layer such as ITO and a few tens of Å on the transparent conductive layer. have. Since the normal metal layer is opaque, the negative electrode of the present invention is formed to be very thin in the range of several tens of microseconds so that light can transmit while the metal layer has a low work function value. The reason why the metal layer having a low work function value is used for the negative electrode is that the electron injection can be actively performed by lowering the energy barrier formed between the negative electrode and the organic layer. This can increase the luminous efficiency of the device.

Luminous efficiency can be improved compared to aluminum by using calcium or magnesium with low work function as negative electrode, but calcium is easily oxidized in air and diffuses easily into light emitting layer and doping light emitting layer to flow leakage current. In the safe aluminum can be adopted. However, the calcium film is not excluded from the negative electrode.

Meanwhile, the light emitting layers 404c and 405c are places where excitons are formed by the combination of electrons and holes. The light emitting layers may be formed of polymer organic materials, such as an alumininium composite (Alq3) and anthracene. EL, PPV (poly (p-phenylenevinylene)), PT (polythiophene) and the like and organic organic EL materials which are derivatives thereof may be used.

The electron transport layers 404d and 405b may use an oxadiazole derivative and the like to lower the work function value between the negative electrode 403 and the light emitting layers 404c and 405c so that electrons can smoothly flow into the light emitting layer. Help. The electron injection layers 404e and 405a, which may be formed between the electron transport layers 404d and 405b and the negative electrode 403, are similar to the electron transport layers 404d and 405b, and the negative electrode 403 and the light emitting layers 404c and 405c. It lowers the work function between.

Therefore, in some cases, only the electron transport layer may be formed between the negative electrode and the light emitting layer.

On the other hand, holes introduced from the positive electrode between the first light emitting layer 404c and the first positive electrode 401 and between the second light emitting layer 405c and the second positive electrode 402 are used as the light emitting layers 404c and 405c. The hole transport layers 404b and 405d are formed, and the hole transport layers 404b and 405d are formed of TPD, a diamine derivative, and poly (9-vinylcarbazole), a photoconductive separator. The hole transport layers 404b and 405d lower the work function between the positive electrodes 401 and 402 and the light emitting layers 404c and 405c to facilitate the inflow of holes into the light emitting layer.

By combining the transport layers, the quantum efficiency can be increased, and the driving voltage can be lowered through a two-step injection process through which the carriers pass through the transport layer instead of being directly injected into the light emitting layer.

Meanwhile, the second positive electrode 402 also supplies holes to the second light emitting layer 405c and also functions as a reflector to reflect light generated from the second light emitting layer 405c to the front. Therefore, the second positive electrode 402 may use a conductive material having excellent reflection characteristics. In the present exemplary embodiment, the second positive electrode 402 may be formed with a thick aluminum layer or platinum layer having a thickness of several thousand microns, thereby forming a conductive positive electrode having excellent opaque reflection characteristics. In addition, the negative electrode is composed of a transparent conductive layer to emit light generated in the second light emitting layer to the top.

In addition, a common voltage is applied to the first positive electrode 401 and the second positive electrode 402, and a driving voltage is applied to the negative electrode, thereby forming a structure in which two organic light emitting diodes are connected in parallel. In the organic light emitting device of the present invention, the light emitting layers are connected in parallel, and thus the driving voltage can be reduced even though the luminance is increased.

Hereinafter, the structure in which the organic light emitting display device of the present invention is formed on the first substrate will be described with reference to FIGS. 5A and 5B.

5A illustrates a planar structure of a unit pixel part of an organic light emitting display device according to an embodiment of the present invention, and FIG. 5B is a cross-sectional view thereof.

Referring to FIG. 5A, a first positive electrode 401 formed of a transparent conductive layer is physically connected to each other on a substrate (not shown) and finally connected to a common voltage supply wiring 420 formed on the outside of the substrate. The first positive electrodes 401 formed for each pixel may be connected to each other by a wire, or may be patterned by a photolithography process. However, in the present embodiment, the wiring connecting the first positive electrode 401 and the common voltage supply wiring 420 are formed by depositing a transparent conductive layer on a substrate and then integrally forming the same through a photolithography process.

The first organic layer 404 is formed on the first positive electrode 401. As described with reference to FIG. 4, the first organic layer 404 may be a plurality of organic layers including an electron transport layer, a light emitting layer, and a hole transport layer. The first organic layer 404 covers the first positive electrode 401 formed for each pixel to prevent a short circuit between the negative electrode and the first positive electrode formed thereafter.

On the other hand, the unit pixel may be formed of the same material as the first positive electrode 401 and island contact pads 410 separated from the first positive electrode 401, respectively. The contact pad 410 is connected to a driving transistor formed on an array substrate in the future to supply a driving voltage to the organic light emitting diode. Therefore, it is preferable to protrude so as to facilitate contact with the driving thin film transistor of the array substrate.

In addition, a transparent conductive negative electrode 403 is formed on the first organic layer 404. The negative electrode 403 is formed on the first organic layer 404 to extend and is also connected to the contact pad 410.

On the other hand, a second organic layer 405 having a second light emitting layer is formed on the negative electrode 403 to completely cover the negative electrode.

A second positive electrode 402 is formed on the second organic layer 405 and has an opaque reflection characteristic that connects all the second organic layers that are formed per unit pixel and are formed laterally. The second positive electrode 402 is connected to the common voltage supply wiring 420 to receive the same common voltage as the first positive electrode.

However, the configuration of the second positive electrode does not have to be a wiring or connection pattern 401a type as shown in FIG. 5A passing through all the second organic layers, and is formed for each unit pixel but is electrically connected to the first positive electrode. It can be configured in the way. That is, the second positive electrode may be formed in an island shape for each unit pixel, and may be connected to the first positive electrode in the connection pattern 401a. In this way, the second positive electrode can receive the same common voltage applied to the first positive electrode.

Meanwhile, the negative electrode 403 and the first positive electrode 401 are insulated by the first organic layer 404, and the negative electrode 403 and the second positive electrode 402 are insulated by the second organic layer 405.

As described above, the organic light emitting display device according to the embodiment includes an organic light emitting element having a plurality of light emitting layers for each pixel, and the organic light emitting element is provided with a plurality of organic layers and connected in parallel with each other. Therefore, it is possible to drive only with a driving voltage for driving one light emitting layer.

In addition, since a plurality of light emitting layers is provided, a more clear organic light emitting display device may be realized by increasing the intensity of light generated from a unit pixel. In addition, since the organic light emitting display device according to the above embodiment is formed on a separate substrate from the array substrate and is completed by bonding, the organic light emitting display device does not need to be formed to avoid driving transistors or switching transistors. can do.

Hereinafter, a manufacturing process of the organic light emitting display device of the embodiment will be described with reference to FIGS. 6A to 6E.

As shown in FIG. 6A, a metal thin film such as aluminum is formed on the entire surface of the first substrate by a sputtering method so that a transparent conductive layer such as ITO and light can pass on the first substrate. The transparent conductive layer may be deposited to a thickness of about 1000 kW, and the metal thin film may be deposited to a thickness of several tens of kW. The two conductive layers are formed in succession.

Subsequently, through a photolithography process, a common voltage is applied to both electrodes by connecting the first positive electrode 401 and the connection pattern 401a for connecting the first positive electrode 401 to each other, and the connection pattern. A common voltage supply wiring 420 is applied and a contact pad 410 is formed for each unit pixel and separated from the first positive electrode 401 to form an island shape.

6B, a first organic layer 404 is formed on the first positive electrode 401 to completely cover the first positive electrode 401 and is formed for each unit pixel. The first organic layer 404 may be completed by sequentially forming a hole injection layer, a hole transport layer forming step, a first light emitting layer forming step, an electron transport layer forming step and an electron injection layer forming step.

In addition, the first light emitting layer has a light emitting center of red, green, and blue, and the light emitting layer forming process may be performed three times by forming a unit pixel of red, green, and blue subunit pixels.

6C, a negative electrode 403, which may be a transparent conductive layer, is formed on the first organic layer 404. The negative electrode 403 is formed for each unit pixel, and is formed on the first organic layer 404 and further extended to be connected to the contact pad 410. Therefore, the driving voltage is applied to the negative electrode 403 through the contact pad 410.

In forming the negative electrode 403, the negative electrode 403 is patterned to be formed on the first organic layer 404 to be electrically separated from the first positive electrode 401.

6D, a second organic layer 405 is formed on the negative electrode 403. The second organic layer 405 may be formed including an electron injection layer forming step, an electron transport layer forming step, a second light emitting layer forming step, a hole transport layer forming step, and a hole injection layer forming step. The plurality of organic films are sequentially formed. The second light emitting layer forming step includes red, green, and blue light emitting layer forming steps.

The second organic layer 405 is patterned to cover the entire negative electrode 403 in a unit pixel.

Next, referring to FIG. 6E, a second positive electrode 402 is formed on the second organic layer 405. The second positive electrode 402 is connected to the common voltage supply wiring 420 while connecting all the second organic layers 405 of the unit pixels arranged laterally. In addition, the second positive electrode 402 is formed to be electrically insulated from the negative electrode 403 by the second organic layer 405.

The second positive electrode 402 may be formed by sputtering the entire surface of the substrate with a opaque metal layer at a thickness of several thousand micrometers and then patterning the photolithography process.

Through the above process, two light emitting layers are provided for each unit pixel on the first substrate, and the two light emitting layers complete an organic light emitting diode connected in parallel with each other.

Next, the organic light emitting display device is completed by bonding the first substrate on which the organic light emitting diode is formed and the second substrate formed through a separate process, that is, the second substrate on which the driving thin film transistor is formed. do.

FIG. 7 illustrates a correspondence view of a first substrate 400 on which an organic light emitting diode is formed, a driving thin film transistor 510, and a second substrate 500 on which a capacitor 520 is formed. Doing.

The drain electrode 530 of the driving thin film transistor contacts the contact pad of the first substrate to apply a driving voltage to the negative electrode 403.

The common voltage is applied to the first positive electrode and the second positive electrode through the common voltage supply wiring to supply electrons and holes to generate light in the light emitting layer.

Therefore, the present invention can increase the luminance of the organic light emitting display device by providing two light emitting layers for each unit pixel. In addition, the organic light emitting display device of the present invention may be formed on a first substrate separate from the array substrate on which the driving thin film transistor is formed, thereby maximizing the area formed per unit pixel, thereby contributing to the increase in luminance.

In addition, the organic light emitting display device of the present invention includes a contact pad portion protruding from the substrate to facilitate connection with the drain electrode of the driving thin film transistor, so that the driving thin film transistor and the organic light emitting display device can easily contact each other during the bonding process.

Claims (26)

A first substrate; A first positive electrode formed on each of the unit pixels in a matrix arrangement on the first substrate; A first organic layer formed on the first positive electrode and including a first light emitting layer; A negative electrode formed on the first organic layer; A second organic layer formed on the negative electrode and including a second light emitting layer; A second positive electrode formed on the second organic layer; A contact pad formed of the same material as the first positive electrode on the first substrate and separated from the first positive electrode and formed for each unit pixel; A second substrate; A matrix array on the second substrate and a driving transistor electrically connected to the negative electrode, The contact pad protrudes higher than the first positive electrode and the cathode covers the contact pad, so that the source electrode of the driving transistor of the second substrate is electrically connected to the negative electrode of the first substrate by the contact pad. An organic light emitting display device. The organic light emitting display device according to claim 1, wherein the first positive electrodes formed per unit pixels are electrically connected to each other to receive a common voltage. The organic light emitting display device as claimed in claim 2, further comprising a common voltage supply wiring electrically connecting the first positive electrode to each other. delete The organic light emitting display device of claim 1, wherein the negative electrode is connected to the contact pad. The organic light emitting display device of claim 1, wherein the negative electrode is electrically separated from the first positive electrode by the first organic layer, and is electrically separated from the second positive electrode by the second organic layer. 4. The organic light emitting diode of claim 3, wherein the second positive electrode is a wire formed on the second organic layer formed for each unit pixel, and is connected to the common voltage supply line to receive the same common voltage as the first positive electrode. EL display. The organic light emitting display device as claimed in claim 1, wherein the first positive electrode is a transparent transparent conductive layer. The organic light emitting display device of claim 8, wherein the first positive electrode further comprises a light transmissive metal film. The method of claim 1, wherein the first organic layer A hole injection layer in contact with the first positive electrode; A hole transport layer formed on the hole injection layer; A first light emitting layer formed on the hole transport layer; An electron transport layer formed on the first light emitting layer; And an electron injection layer formed on the electron transport layer and connected to the negative electrode. The organic light emitting display device of claim 10, wherein the second organic layer is symmetrical with the first organic layer with respect to the negative electrode. delete The organic light emitting display device as claimed in claim 1, wherein the driving transistor is an N-type thin film transistor. delete The organic light emitting display device according to claim 1, wherein the second positive electrode is a conductive layer having an opaque reflective characteristic. The organic light emitting display device of claim 1, wherein the first positive electrode and the second positive electrode are electrically connected in parallel. delete delete delete Forming a first positive electrode and a contact pad formed on each of the unit pixels in a matrix array on the first substrate and electrically connected to each other; Forming a first organic layer including a light emitting layer on the first positive electrode; Forming a transparent negative electrode on the first organic layer; Forming a second organic layer including a light emitting layer on the negative electrode; Forming a second positive electrode on the second organic layer; And Attaching a second substrate corresponding to the first substrate and electrically connected to the negative electrode to a second substrate, the second substrate being formed for each unit pixel for matrix arrangement, with the first substrate such that the negative electrode and the driving transistor are electrically connected to each other; Include, The contact pad protrudes higher than the first positive electrode, and the cathode covers the contact pad so that the source electrode of the driving transistor of the second substrate is electrically connected to the negative electrode of the first substrate by the contact pad. An organic light emitting display device manufacturing method characterized in that. 21. The method of claim 20, wherein forming the first positive electrode And a common voltage supply wiring electrically connecting the first positive electrode to each other. The method of claim 21, wherein forming the negative electrode And etching the negative electrode such that the negative electrode and the contact pad are connected to each other. The method of claim 20, wherein forming the first organic layer Forming a hole injection layer on the first positive electrode; Forming a hole transport layer on the hole injection layer; Forming a first light emitting layer on the hole transport layer; Forming an electron transport layer on the first light emitting layer; And forming an electron injection layer on the electron transport layer. The method of claim 20, wherein forming the second organic layer Forming an electron injection layer on the negative electrode; Forming an electron transport layer on the electron injection layer; Forming a second light emitting layer on the electron transport layer; Forming a hole transport layer on the second light emitting layer; And forming a hole injection layer on the hole transport layer. The method of claim 23, wherein forming the first organic layer After the hole injection layer, the hole transport layer, the first light emitting layer, the electron transport layer, and the electron injection layer are successively formed on the first positive electrode, the first organic layer is formed by one photolithography process. An organic light emitting display device manufacturing method. The method of claim 24, wherein forming the second organic layer The electron injection layer, the electron transport layer, the second emission layer, the hole transport layer, and the hole injection layer are successively formed on the negative electrode, and then the second organic layer is formed by one photolithography process. Electroluminescent display device manufacturing method.

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