KR20070101930A - Electro luminescence display device and method thereof - Google Patents

Abstract

An electro luminescence display device and a method for manufacturing the same are provided to improve a production yield by forming a sub common electrode on an upper part of a cathode electrode or a non-light-emitting region of a pixel circuit unit to be located on the same line with a contact hole. An electro luminescence display device includes a substrate(302), a pixel circuit unit(308), a wire distribution unit(306), an insulation layer, and a sub common electrode(312). The pixel circuit unit(308) has at least two electrodes formed on the substrate(302). The wire distribution unit(306) is formed to be electrically coupled to any one of two electrodes. The insulation layer is formed on the wire distribution unit(306). A contact hole, which electrically connects the electrode to the wire distribution unit(306) by exposing a part of the wire distribution unit(306), is formed on the insulation layer. The sub common electrode(312) is formed on the electrode, and is located on the same line with the contact hole.

Description

Electroluminescent display device and method for manufacturing same {Electro luminescence display device and Method

1 is a plan view of a conventional organic light emitting display device.

FIG. 2 is a cross-sectional view of the organic light emitting display device illustrated in FIG. 1 cut out into areas A to A '.

3 is a plan view of an organic light emitting display device according to a first exemplary embodiment of the present invention.

FIG. 4 is a cross-sectional view of the organic light emitting display device shown in FIG. 3 cut out into regions B to B '.

5 is a plan view of an organic light emitting display device according to a second exemplary embodiment of the present invention.

FIG. 6 is a cross-sectional view of the organic light emitting diode display illustrated in FIG. 5 cut out into regions C to C ′.

7 is a plan view of an organic light emitting display device according to a third embodiment of the present invention.

* Description of the main parts of the drawings *

300, 400, 500, 600, 700: organic electroluminescent display

302, 402, 502, 602, 702: substrate 303, 703: pixel

308, 508, 708: pixel circuit section 306, 406, 506, 606, 706: wiring section

304, 504, 704: pad portion

310, 410, 510, 610, 710: cathode electrode

312, 412, 512, 612, 712: auxiliary common electrode

403 and 603 gate insulating films 405 and 605 interlayer insulating films

407 and 607 planarization insulating films 411 and 611 hole injection layers

413, 613: hole transport layer 414, 614: light emitting layer

415, 615: electron transport layer 417, 617: electron injection layer

419, 619: protective film 721: other auxiliary common electrode

P ₁ : Contact hole P ₂ : non-light-emitting area

P ₃ : All Areas

The present invention relates to an electroluminescent display and a method of manufacturing the same.

Electroluminescent devices are largely classified into inorganic electroluminescent devices and organic electroluminescent devices according to the material of the light emitting layer. Self-luminous devices that emit light by themselves have fast response speed and high luminous efficiency, luminance, and viewing angle. have. Such organic light emitting diodes (Organic Emitting Light Diodes), which use organic materials among the electroluminescent devices, have a low DC driving voltage, can be thinned, uniformity of emitted light, easy pattern formation, and comparable to other light emitting devices. It has the advantages of luminous efficiency, all color light emission in the visible region, and is a technical field that is being actively researched for application to display elements.

Herein, the organic EL device may include a bottom emission method and a top emission method according to a direction in which light is emitted. In addition, the organic EL device is classified into a passive matrix organic emitting diode (PMOELD) and an active matrix organic emitting diode (AMOELD) according to a driving method.

One example of the organic light emitting diode display, which includes a pad part formed by being electrically connected to a wiring for driving, is as shown in FIGS. 1 and 2.

1 is a plan view of a conventional organic light emitting display device, and FIG. 2 is a cross-sectional view of the organic light emitting display device shown in FIG.

First, although one example of the conventional organic light emitting display device 100 is not illustrated on the substrate 102, the organic light emitting display device 100 is used to drive the pixel circuit unit 108 and the organic light emitting display device on which a plurality of pixels (not shown) are located. In order to do this, the wiring part 106 formed in electrical connection with the pad part 104 was formed.

In addition, the cathode electrode 110, which is a common electrode for applying a voltage to the ground voltage source, is formed in the wiring unit 106 electrically connected to the pad 104.

More specifically, as shown in FIG. 2, in the conventional organic light emitting display device 200, a gate insulating layer 203 is formed on the substrate 202 to insulate the gate electrode. An interlayer insulating film 205 for opening a source region (not shown) and a drain region (not shown) was formed, and a planarizing insulating film 207 is formed on the upper portion of the interlayer insulating film 205 to planarize the surface. A wiring portion 206 for electrically connecting the pad portion (FIG. 104 of FIG. ₁ ) through the contact hole P ₁ of 207 is formed to apply a voltage to the ground voltage source.

In addition, the cathode electrode 210, which is a common electrode, is electrically connected to the wiring part 206 exposed through the contact hole P _1. The hole injection layer 211, the hole transport layer 213, the light emitting layer 214, The electron transport layer 215 and the electron injection layer 217 are formed to surround the same.

Finally, a protective film 219 is formed on the cathode electrode 210 to prevent the penetration of moisture and oxygen.

One example of the conventional organic light emitting display device 100 and 200 is a cathode electrode 210 which is a common electrode electrically connected to the wiring unit 206 by a large amount of current continuously due to the characteristics of the organic light emitting diode. In this case, when the cathode electrode 210 is thinly formed, when a large amount of current continuously flows, heat is shorted or oxidized. As a result, there is a problem in that the lifespan of the device is shortened and reliability is lowered.

In order to solve the above problems, the present invention forms an auxiliary common electrode on the cathode electrode so as to be located on the same line as the contact hole in the electroluminescent display device, or even to the non-light emitting area of the pixel circuit part, thereby providing sheet resistance of the cathode electrode. It is an object of the present invention to provide a capable of suppressing the short-circuit or oxidation of the cathode electrode by lowering the voltage.

In addition, the present invention forms an auxiliary common electrode on the upper portion of the cathode electrode in the longitudinal direction of the wiring portion in the length direction of the wiring portion in the electroluminescent display device, thereby reducing the sheet resistance of the cathode electrode to suppress the short-circuit or oxidation of the cathode electrode. The purpose is to provide a number.

In addition, according to the present invention, an auxiliary common electrode is formed on an upper portion of the cathode electrode in the longitudinal direction of the wiring part in the longitudinal direction of the wiring part in the electroluminescent display device, and the other auxiliary common electrode is arranged in the same line as the contact hole. The purpose of the present invention is to provide a cathode in which the cathode is shorted or oxidized by lowering the sheet resistance of the cathode by connecting to the electrode and forming the upper portion of the cathode, or even forming the non-light emitting region of the pixel circuit portion.

Another object of the present invention is to provide a production yield as a display element when manufacturing such an electroluminescent display device.

In order to achieve the above object, the present invention provides a substrate, a pixel circuit portion having two or more electrodes formed on the substrate, a wiring portion formed to be electrically connected to one of the two or more electrodes, and formed on the wiring portion, A portion of the wiring part is exposed and includes an insulating film having a contact hole electrically connecting the one electrode and the wiring part, and an auxiliary common electrode formed on one electrode and positioned on the same line as the contact hole.

According to another feature of the invention, the auxiliary common electrode is characterized in that formed to be connected to the contact hole.

According to another feature of the invention, the auxiliary common electrode is characterized in that formed in the non-light emitting region of the pixel circuit portion.

According to another feature of the invention, the pixel circuit portion having a substrate, two or more electrodes formed on the substrate, a wiring portion formed to be electrically connected to one of the two or more electrodes, and formed on the wiring portion, A portion of the wiring part is exposed and includes an insulating film having at least one contact hole electrically connecting the one electrode and the wiring part, and an auxiliary common electrode formed on one electrode corresponding to at least one of the contact holes in the length direction of the wiring part.

According to another feature of the invention, the auxiliary common electrode is characterized in that it is formed corresponding to the entire area of the wiring portion.

According to another feature of the present invention, another auxiliary common electrode is further formed to be connected to the auxiliary common electrode and positioned on the same line as the contact hole.

According to another feature of the invention, the other auxiliary common electrode is characterized in that formed in the non-light emitting region of the pixel circuit portion.

According to another feature of the invention, the wiring portion is characterized in that any one of a gate electrode material, a data line electrode material.

According to another feature of the invention, one electrode is characterized in that the common cathode electrode.

According to another feature of the invention, the steps of preparing a substrate, forming a pixel circuit portion having at least two electrodes on the substrate, and forming a wiring portion to be electrically connected to one of the two or more electrodes And forming a contact hole to electrically connect one electrode to the wiring part by exposing a portion of the wiring part to form an insulating film, and forming the insulating layer on one electrode so as to be on the same line as the contact hole. Forming an auxiliary common electrode.

According to another feature of the present invention, the forming of the auxiliary common electrode is characterized in that the step of forming the auxiliary common electrode by connecting to the contact hole.

According to another feature of the invention, the step of forming the auxiliary common electrode, characterized in that the step of forming the auxiliary common electrode in the non-light emitting region of the pixel circuit portion.

According to another feature of the invention, the steps of preparing a substrate, forming a pixel circuit portion having at least two electrodes on the substrate, and forming a wiring portion to be electrically connected to one of the two or more electrodes And forming an insulating film by forming at least one contact hole to expose a portion of the wiring portion to electrically connect the one electrode and the wiring portion by exposing a portion of the wiring portion, and to at least one of the contact holes in the longitudinal direction of the wiring portion. Correspondingly forming an auxiliary common electrode on one electrode.

According to another feature of the invention, the step of forming the auxiliary common electrode is characterized in that the step of forming the auxiliary common electrode to correspond to the entire area of the wiring portion.

According to still another feature of the present invention, the method may further include forming another auxiliary common electrode to be connected to the auxiliary common electrode so as to be located on the same line as the contact hole.

According to another feature of the invention, the step of forming another auxiliary common electrode is characterized in that the step of forming the other auxiliary common electrode to the contact hole.

According to another feature of the present invention, the forming of the other auxiliary common electrode is characterized in that the step of forming the other auxiliary common electrode in the non-light emitting region of the pixel circuit portion.

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

<First Embodiment>

3 is a plan view of an organic light emitting display device according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view of the organic light emitting display device shown in FIG. First, the organic light emitting display device according to the present invention is provided in the same manner as the organic light emitting display device described above with reference to FIGS. 1 and 2. However, the organic light emitting display device according to the present invention is formed on the cathode electrode so that the auxiliary common electrode is positioned in the same line as the wiring part exposed through the contact hole of the planarization insulating film for planarization. Such an organic light emitting display device according to the present invention will be described with reference to FIGS. 3 and 4.

First, as shown in FIG. 3, the organic light emitting display device 300 according to the present invention includes a plurality of substrates 302 and the same as the organic light emitting display device 100 shown in FIG. 1. The pixel circuit unit 308 including the pixels 303 of the pixel, the wiring unit 306 formed by being electrically connected to the pad unit 304, and the cathode electrode 310 serving as a common electrode are formed as one electrode. Such components of the organic electroluminescent display 300 according to the present invention, organic relations among them, and their respective functions are described with reference to FIG. 1. Since the components and the organic relationship between them and their functions are the same, respective descriptions thereof will be omitted below.

However, in the organic light emitting display device 300 according to the present invention, the auxiliary common electrode 312 is positioned on the same line as the wiring part 306 exposed through the contact hole P ₁ . Is formed.

In more detail, as shown in FIG. 4, in the organic light emitting display device 400 according to the present invention, a gate insulating layer 403 is formed on the substrate 402 to insulate the gate electrode. An interlayer insulating film 405 is formed to open the drain region (not shown) and the drain region (not shown). A wiring portion 406 for electrically connecting with the pad portion (Fig. 304 in Fig. 3) through the contact hole P ₁ is formed to apply a voltage to the ground voltage source. In this case, the wiring unit 406 is formed of any one of a gate electrode material and a data line electrode material. Here, a data line electrode material for applying a data signal is formed.

In addition, the cathode electrode 410, which is a common electrode, is a hole injection layer 411, a hole transport layer 413, and a light emitting layer as one electrode so as to be electrically connected to the wiring part 406 exposed through the contact hole P ₁ . 414, the electron transport layer 415, the electron injection layer 417, and the like, and the auxiliary common electrode 412 is exposed through the contact hole P ₁ of the planarization insulating layer 407 for planarization. The cathode electrode 410 is formed on the same line as the wiring unit 406.

Preferably, the auxiliary common electrode 412 is connected to the exposed wiring portion 406 through the contact hole P ₁ and is formed on the cathode electrode 410, so that the ratio of the pixel circuit portion 308 of FIG. It is formed far the light-emitting region (Fig. 3 P _2).

At this time, the cathode electrode 410 and the auxiliary common electrode 412 is formed of a material of any one or any alloy of Ag, Al, Au, Cu, Mg, Cr, Mo, LiF, ITO, IZO, and auxiliary common The material of the electrode 412 is preferably formed of a component having a lower resistance than the material of the cathode electrode 410.

Finally, a protective film 419 is formed on the auxiliary common electrode 412 to prevent the penetration of moisture and oxygen.

As described above, the organic light emitting display devices 300 and 400 according to the present invention allow a large amount of current to continuously flow through the cathode electrode 410 which is a common electrode electrically connected to the wiring unit 406. Even though the auxiliary common electrode 412 is connected to the wiring part 406 exposed through the contact hole P ₁ and formed on the cathode electrode 410, the non-light emitting area of the pixel circuit part 308 of FIG. 3 is formed. Since it is formed even up to P ₂ of FIG. 3, the sheet resistance of the cathode electrode 410 can be lowered. As a result, when a large amount of current continuously flows, heat can be shorted or oxidized, thereby extending the life of the device and improving reliability.

On the other hand, by changing the structure of the auxiliary common electrode of the organic light emitting display according to the present invention can reduce the sheet resistance of the cathode electrode in electrical contact with the wiring, another example of such an organic light emitting display according to the present invention Looking at it as shown in FIG.

Second Embodiment

FIG. 5 is a plan view of an organic light emitting display device according to a second exemplary embodiment of the present invention, and FIG. 6 is a cross-sectional view of the organic light emitting display device shown in FIG. First, the organic light emitting display device according to the present invention is provided in the same manner as the organic light emitting display device described above with reference to FIGS. 3 and 4. However, in the organic light emitting display device according to the present invention, the auxiliary common electrode is formed on the cathode electrode so as to correspond to at least one of the contact holes in the length direction of the wiring part. Such an organic light emitting display device according to the present invention will be described with reference to FIGS. 5 and 6.

First, as shown in FIG. 5, the organic electroluminescent display 500 according to the present invention is the same as the organic electroluminescent display 100 shown in FIG. 1 (100 of FIG. 1) and the substrate 502. Although not shown, a pixel circuit unit 508 including a plurality of pixels (not shown), a wiring unit 506 formed by being electrically connected to the pad unit 504, and a cathode electrode 510 which is a common electrode as one electrode. ) Is formed.

Such components of the organic light emitting display device 500 according to the present invention, organic relations among them, and their respective functions are described with reference to FIG. 1. Since the components and the organic relationship between them and their functions are the same, respective descriptions thereof will be omitted below.

However, in the organic light emitting display device 500 according to the present invention, the auxiliary common electrode 512 corresponds to one or more of the contact holes P _{1 in} the longitudinal direction of the wiring unit 506, so that the upper portion of the cathode electrode 510 is disposed. Is formed.

In more detail, as shown in FIG. 6, in the organic light emitting display device 600 according to the present invention, a gate insulating layer 603 is formed on the substrate 602 to insulate the gate electrode. An interlayer insulating film 605 is formed to open (not shown) and drain regions (not shown). A planarizing insulating film 607 is formed on the upper portion of the interlayer insulating film 605 to form a planarizing insulating film 607. A wiring portion 606 for electrically connecting the pad portion (FIG. 504 of FIG. 5) through the contact hole P ₁ is formed to apply a voltage to the ground voltage source. In this case, the wiring unit 606 is formed of any one of a gate electrode material and a data line electrode material. Here, the data line electrode material for applying the data signal is formed.

In addition, the cathode electrode 610, which is a common electrode, is a hole injection layer 611, a hole transport layer 613, a light emitting layer 614, and an electron transport layer 615. And an electron injecting layer 617 and the like, and the auxiliary common electrode 612 corresponds to one or more of the contact holes P _{1 in} the longitudinal direction of the wiring unit 606 and is disposed on the cathode electrode 610. Is formed. Preferably, the auxiliary common electrode 612 is formed on the cathode electrode 610 to correspond to the entire region P ₃ of the wiring unit 606.

At this time, the cathode electrode 610 and the auxiliary common electrode 612 is formed of a material of any one or any alloy of Ag, Al, Au, Cu, Mg, Cr, Mo, LiF, ITO, IZO, and auxiliary common It is preferable that the material of the electrode 612 is formed of a component having a lower resistance than the material of the cathode electrode 610.

Since the passivation layer 619 is formed through a sequential process in the same manner as the passivation layer 419 of FIG. 4 of the organic light emitting display device 400 shown in FIG. Description will be omitted below.

Such organic electroluminescent display devices 500 and 600 according to the present invention have a large amount continuously due to the characteristics of the organic light emitting display device similar to the organic electroluminescent display devices 300 and 400 described with reference to FIGS. 3 and 4. Although the current of the current flows through the cathode electrode 610, which is a common electrode electrically connected to the wiring unit 606, the auxiliary common electrode 612 extends the entire area of the wiring unit 606 in the longitudinal direction of the wiring unit 606. Since it is formed on the cathode electrode 610 to correspond to P ₃ ), it is possible to lower the sheet resistance of the cathode electrode 610. As a result, when a large amount of current continuously flows, heat can be shorted or oxidized, thereby extending the life of the device and improving reliability.

On the other hand, by changing the structure of the auxiliary common electrode of the organic light emitting display according to the present invention it is possible to further lower the sheet resistance of the cathode electrode in electrical contact with the wiring portion, another example of such an organic light emitting display according to the present invention Looking at as follows.

Third Embodiment

7 is a plan view of an organic light emitting display device according to a third embodiment of the present invention. First, the organic light emitting display device according to the present invention is provided in the same manner as the organic light emitting display device described above with reference to FIGS. 3 and 5. However, in the organic light emitting display device according to the present invention, the auxiliary common electrode is formed on the cathode electrode so as to correspond to the entire area of the wiring part in the longitudinal direction of the wiring part, and is located on the same line as the contact hole while being connected to the auxiliary common electrode. Another auxiliary common electrode is further formed on top of the cathode electrode. Such an organic light emitting display device according to the present invention will be described with reference to FIG. 7.

As shown in FIG. 7, the organic light emitting display device 700 according to the present invention is the same as the organic light emitting display device 300 shown in FIGS. 3 and 5 (300 in FIG. 3 and 500 in FIG. 5). A substrate 702, a pixel circuit portion 708 having a plurality of pixels 703, a wiring portion 706 formed by being electrically connected to the pad portion 704, and a cathode electrode as a common electrode as one electrode 710 is formed.

Such components of the organic electroluminescent display 700 according to the present invention, organic relations between them, and their respective functions are described with reference to FIGS. 3 and 5. 3 and 500 of FIG. 5 are identical to the respective components and their organic relations and their respective functions, and thus, detailed descriptions thereof will be omitted below.

However, in the organic light emitting display device 700 according to the present invention, the cathode electrode 710 so that the auxiliary common electrode 712 corresponds to the entire region P ₃ of the wiring unit 706 in the longitudinal direction of the wiring unit 706. The other auxiliary common electrode 721 is further formed on the cathode electrode 710 so as to be formed on the upper side of the cathode electrode 710 so as to be positioned on the same line as the contact hole P _{1 while being} connected to the auxiliary common electrode 712. At this time, the other auxiliary common electrode 721 is formed even in the non-light emitting area P ₂ of the pixel circuit unit 708.

As described above, the organic light emitting display device 700 according to the present invention is the same as the organic light emitting display device 300, 400, 500, 600 described with reference to FIGS. 3 to 6. Although a large amount of current flows through the cathode electrode 710, which is a common electrode electrically connected to the wiring portion 706, the auxiliary common electrode 712 moves the wiring portion 706 in the longitudinal direction of the wiring portion 706. It is formed in the upper portion of the cathode electrode 710 to correspond to the region (P ₃ ), and is connected to the auxiliary common electrode 712 and the other auxiliary on the upper portion of the cathode electrode 710 to be located in the same line as the contact hole (P ₁ ) Since the common electrode 721 is further formed, the sheet resistance of the cathode electrode 710 can be further lowered. As a result, when a large amount of current continuously flows, heat can be shorted or oxidized, thereby extending the life of the device and improving reliability.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

According to the electroluminescent display of the present invention and the manufacturing method thereof, the following effects can be obtained.

First, by forming the auxiliary common electrode on the cathode electrode so as to be on the same line as the contact hole in the electroluminescent display, or by forming the non-light emitting region of the pixel circuit part, the sheet resistance of the cathode is reduced to short-circuit or oxidize the cathode. There is an effect that can be suppressed.

In addition, by forming the auxiliary common electrode on the upper portion of the cathode electrode in the longitudinal direction of the wiring portion in the length direction of the wiring portion in the electroluminescent display device, the sheet resistance of the cathode electrode can be lowered to prevent the cathode electrode from shorting or oxidizing. There is.

In addition, the auxiliary common electrode is formed on the cathode electrode in the longitudinal direction of the wiring part in the length direction of the wiring part in the electroluminescent display device, and the other auxiliary common electrode is connected to the auxiliary common electrode so as to be on the same line as the contact hole. By forming it on the cathode electrode or even in the non-light emitting region of the pixel circuit portion, the sheet resistance of the cathode can be further lowered to suppress the short-circuit or oxidation of the cathode electrode.

Second, there is another effect that can improve the production yield as a display element when manufacturing such an electroluminescent display.

Claims (17)

A substrate; A pixel circuit unit having two or more electrodes formed on the substrate; A wiring unit formed to be electrically connected to one of the two or more electrodes; An insulating film formed on the wiring part and having a contact hole for exposing a portion of the wiring part to electrically connect the one electrode to the wiring part; And an auxiliary common electrode formed on the one electrode and positioned on the same line as the contact hole. The method of claim 1, And the auxiliary common electrode is connected to the contact hole. The method of claim 1, And the auxiliary common electrode is formed in a non-light emitting area of the pixel circuit unit. A substrate; A pixel circuit unit having two or more electrodes formed on the substrate; A wiring unit formed to be electrically connected to one of the two or more electrodes; An insulating film formed on the wiring part and having at least one contact hole for exposing a portion of the wiring part to electrically connect the one electrode to the wiring part; And an auxiliary common electrode formed in the one electrode corresponding to at least one of the contact holes in the length direction of the wiring part. The method of claim 4, wherein The auxiliary common electrode is formed to correspond to the entire area of the wiring unit. The method of claim 5, And another auxiliary common electrode further connected to the auxiliary common electrode and positioned on the same line as the contact hole. The method of claim 6, And the other auxiliary common electrode is formed in a non-light emitting area of the pixel circuit unit. The method according to claim 1 or 4, And wherein the wiring portion is one of a gate electrode material and a data line electrode material. The method according to claim 1 or 4, And the one electrode is a common cathode electrode. Preparing a substrate; Forming a pixel circuit portion to have two or more electrodes on the substrate; Forming a wiring part to be electrically connected to one of the two or more electrodes; Forming an insulating film on the wiring part and forming a contact hole to expose a portion of the wiring part to electrically connect the one electrode to the wiring part; And forming an auxiliary common electrode formed on the one electrode so as to be positioned on the same line as the contact hole. The method of claim 10, Forming the auxiliary common electrode, And connecting the auxiliary common electrode to the contact hole to form the auxiliary common electrode. The method of claim 10, Forming the auxiliary common electrode, And forming the auxiliary common electrode in the non-light emitting area of the pixel circuit unit. Preparing a substrate; Forming a pixel circuit portion to have two or more electrodes on the substrate; Forming a wiring part to be electrically connected to one of the two or more electrodes; Forming an insulating film on the wiring part and forming at least one contact hole to expose a portion of the wiring part to electrically connect the one electrode and the wiring part; And forming an auxiliary common electrode on the one electrode corresponding to one or more of the contact holes in the length direction of the wiring part. The method of claim 13, Forming the auxiliary common electrode, And forming the auxiliary common electrode to correspond to the entire area of the wiring part. The method of claim 14, And forming another auxiliary common electrode to be connected to the auxiliary common electrode so that the auxiliary common electrode is positioned on the same line as the contact hole. The method of claim 15, Forming the other auxiliary common electrode, And connecting the other auxiliary common electrode to the contact hole. The method of claim 15, Forming the other auxiliary common electrode, And forming the other auxiliary common electrode in the non-light emitting area of the pixel circuit part.

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