KR20150054125A - Organic light emitting diode device and manufacturing method thereof - Google Patents

Abstract

According to an embodiment of the present invention, provided are an organic light emitting display device capable of easily supplying power to a common electrode which is a display surface electrode, and a manufacturing method thereof. The organic light emitting display device comprises a first substrate, a plurality of first electrodes, an auxiliary wiring, a pixel definition layer, an organic layer, and a second electrode.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) display device,

[0001] The present invention relates to an organic light emitting display and a method of manufacturing the same, and more particularly, to an OLED display capable of supplying power to a second electrode that is a common electrode, and a method of manufacturing the same.

Recently, organic light emitting diode (OLED) displays have attracted attention as display devices.

The organic light emitting display device is a self light emitting display device that displays an image with an organic light emitting diode that emits light. Unlike a liquid crystal display, an organic light emitting display does not require a separate light source, so that the thickness and weight can be relatively reduced. In addition, organic light emitting display devices can exhibit high quality characteristics such as low power consumption, high luminance, and high reaction speed, and are attracting attention as next generation display devices.

In general, the organic light emitting device has a hole injection electrode, an organic light emitting layer, and an electron injection electrode. The excitons formed by combining holes supplied from the hole injection electrode and electrons supplied from the electron injection electrode in the organic light emitting layer are in a ground state Light is generated by energy generated when falling.

The organic light emitting display may be divided into a top emission type and a bottom emission type according to a direction in which light is emitted.

The top emission type organic light emitting display device displays an image in a direction opposite to the substrate on which the organic light emitting elements are disposed. A surface on which an image is displayed is referred to as a display surface. A light-transmitting electrode is disposed on the display surface, and the light-transmitting electrode is formed in the form of a common electrode. However, because of the resistance of the light-transmitting electrode itself, a voltage drop (IR DROP) occurs in the light-transmitting electrode as it moves away from the power source. Particularly, such a voltage drop is conspicuous in a large area organic light emitting display. Therefore, methods for solving the voltage drop occurring in the light-transmissive common electrode of the top emission type OLED display device are required.

An example of the present invention is to provide an organic light emitting display device in which auxiliary wiring is disposed between first electrodes that are pixel electrodes, and the auxiliary wiring is capable of supplying power to a second electrode that is a common electrode. Also, an example of the present invention is to provide a method of manufacturing the organic light emitting display device.

An example of the present invention is a liquid crystal display comprising: a first substrate; A plurality of first electrodes disposed on the first substrate; At least one auxiliary wiring disposed on the first substrate so as to be spaced apart from the first electrode; A pixel defining layer disposed on the first substrate and corresponding to the first electrode and the auxiliary wiring and having a first opening and a second opening, respectively; An organic layer disposed on at least a first electrode corresponding to the first opening, the organic layer including an organic light emitting layer; And a second electrode disposed on the organic layer, wherein the auxiliary wiring includes a wide portion having a wide line width, and the wide portion of the auxiliary wiring is connected to the second electrode.

In one embodiment of the present invention, the organic film is disposed on the auxiliary wiring, the organic film has the contact hole in the second opening, and the wide portion of the auxiliary wiring is connected to the second electrode through the contact hole.

In one embodiment of the present invention, the organic layer includes at least one of a hole injection layer and a hole transport layer disposed between the first electrode and the organic light emitting layer.

In one embodiment of the present invention, the organic film includes at least one of an electron transport layer and an electron injection layer disposed between the organic light emitting layer and the second electrode.

In one example of the present invention, the auxiliary wiring is disposed on the same layer as the first electrode.

In one example of the present invention, the auxiliary wiring and the first electrode are made of the same material.

In one example of the present invention, the auxiliary wiring and the first electrode include a metal layer.

In an example of the present invention, the wide portion is provided at a portion where the interval between the plurality of first electrodes is different from each other and the interval between the first electrodes is wide.

In one embodiment of the present invention, the organic light emitting layer includes a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

In one example of the present invention, the wide portion is disposed between the red light emitting layers or between the green light emitting layers.

In one example of the present invention, a wide portion is disposed in a space between at least one of the green light emitting layer and the red light emitting layer and the blue light emitting layer.

An example of the present invention is a method of manufacturing a plasma display panel, comprising: forming a plurality of first electrodes on a first substrate; Forming at least one auxiliary wiring on the first substrate and spaced apart from the first electrode; Forming a pixel defining layer on the first substrate, the pixel defining layer having a first opening and a second opening respectively corresponding to the first electrode and the auxiliary wiring; Forming an organic film including an organic light emitting layer on a first electrode corresponding to at least a first opening; And forming a second electrode on the organic film, wherein the auxiliary wiring includes a wide portion having a wide line width, and in the step of forming the second electrode, the second electrode is connected to the wide portion And a method of manufacturing the organic light emitting display device.

In one embodiment of the present invention, in the organic film formation step, the organic film is disposed on the auxiliary wiring, and after forming the second electrode after the organic film formation step, a part of the organic film disposed in the second opening Thereby forming a contact hole.

In one embodiment of the present invention, in the step of forming the second electrode, the second electrode is connected to the wide portion of the auxiliary wiring via the contact hole.

In one embodiment of the present invention, the organic film formation step includes forming at least one of a hole injection layer and a hole transport layer on the first electrode before forming the organic emission layer.

In one embodiment of the present invention, the organic film formation step includes forming at least one of an electron transport layer and an electron injection layer on the organic light emitting layer after forming the organic light emitting layer.

In one example of the present invention, the step of forming the first electrode and the step of forming the auxiliary wiring are performed in the same process.

In one embodiment of the present invention, in the step of forming the first electrode, the first electrode is formed such that intervals between the first electrodes are different from each other. In the step of forming the auxiliary wiring, The wide portion of the auxiliary wiring is disposed.

The organic light emitting display according to an example of the present invention is configured such that the common electrode can supply a voltage to the second electrode so that the problem caused by the voltage drop at the common electrode can be prevented. In addition, the auxiliary wiring may have a wide width portion, and the auxiliary wiring and the second electrode may be selectively connected to each other in the wide portion, thereby improving space efficiency.

1 is a plan view of an OLED display according to an embodiment of the present invention.
2 is an example of a cross-sectional view taken along a line I-I 'in Fig.
3 is a schematic view showing the arrangement of a first electrode and an auxiliary wiring in an organic light emitting display according to another example of the present invention.
4 is a schematic view showing the arrangement of a first electrode and an auxiliary wiring in an organic light emitting diode display according to another example of the present invention.
5 is a schematic view showing the arrangement of a first electrode and an auxiliary wiring in an organic light emitting display according to another example of the present invention.
6A to 6G are schematic views illustrating a manufacturing process of an organic light emitting diode display according to an example of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited by the drawings or embodiments described below.

In the drawings, in order to facilitate the understanding of the invention, each component and its shape may be briefly drawn or exaggerated, and components in an actual product may be omitted without being represented. Accordingly, the drawings are to be construed as illustrative of the invention. Components having the same or similar functions in the drawings are denoted by the same reference numerals.

It will also be understood that where a layer or element is referred to as being "on" another layer or element, it is understood that not only is the layer or element disposed in direct contact with the other layer or element, To the case where the third layer is disposed interposed therebetween.

Hereinafter, a first embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig.

1 and 2, the OLED display 101 according to the first embodiment of the present invention includes a first substrate 100, a wiring portion 200, a pixel defining layer 190, Device 300 and a second substrate 500.

The first substrate 100 may be formed of an insulating substrate selected from the group consisting of glass, quartz, ceramics, and plastic. However, the first embodiment of the present invention is not limited thereto, and the first substrate 100 may be formed of a metallic material such as stainless steel.

A buffer layer 120 is disposed on the first substrate 100. The buffer layer 120 may include one or more films selected from various inorganic films and organic films. The buffer layer 120 serves to prevent unnecessary components such as impurities or moisture from penetrating into the wiring part 200 and the organic light emitting device 300 and to flatten the surface. However, the buffer layer 120 is not necessarily required, and may be omitted depending on the type of the first substrate 100 and the process conditions.

The wiring portion 200 is disposed on the buffer layer 120. The wiring part 200 includes a plurality of thin film transistors 10 and 20 and drives the organic light emitting element 300. That is, the organic light emitting diode 300 emits light according to a driving signal received from the wiring unit 200 to display an image.

1 and 2 show an active matrix (TFT) structure of 2Tr-1Cap structure in which two thin film transistors (TFTs) 10 and 20 and one capacitor 80 are provided in one pixel, , AM) type organic light emitting display device 101 are shown. However, the first embodiment of the present invention is not limited to the above structure. For example, the organic light emitting diode display 101 may include three or more thin film transistors and two or more charge accumulating elements in one pixel, and may have various structures by forming additional wiring lines. Here, a pixel is a minimum unit for displaying an image, and the organic light emitting diode display 101 displays an image through a plurality of pixels.

A switching thin film transistor 10, a driving thin film transistor 20, a capacitor element 80, and an organic light emitting diode (OLED) 300 are provided for each pixel. Here, the structure including the switching thin film transistor 10, the driving thin film transistor 20, and the capacitor element 80 is referred to as a wiring portion 200. A gate line 151 disposed along one direction and a data line 171 and a common power line 172 insulated from the gate line 151 are also disposed in the wiring portion 200. One pixel may be defined as a boundary between the gate line 151, the data line 171, and the common power line 172, but is not limited thereto. A pixel may be defined by the pixel defining layer 190.

The capacitor element 80 includes a pair of capacitor plates 158 and 178 disposed with an interlayer insulating film 160 interposed therebetween. Here, the interlayer insulating film 160 becomes a dielectric. The capacitances are determined by the voltage between the charge accumulated in the capacitor element 80 and the positive capacitor plates 158 and 178.

The switching thin film transistor 10 includes a switching semiconductor layer 131, a switching gate electrode 152, a switching source electrode 173, and a switching drain electrode 174. The driving thin film transistor 20 includes a driving semiconductor layer 132, a driving gate electrode 155, a driving source electrode 176, and a driving drain electrode 177. The semiconductor layers 131 and 132 and the gate electrodes 152 and 155 are insulated by the gate insulating layer 130.

The switching thin film transistor 10 is used as a switching element for selecting a pixel to emit light. The switching gate electrode 152 is connected to the gate line 151. The switching source electrode 173 is connected to the data line 171. The switching drain electrode 174 is spaced apart from the switching source electrode 173 and connected to one of the capacitor plates 158.

The driving thin film transistor 20 applies a driving power for emitting the organic light emitting layer 320 of the organic light emitting element 300 in the selected pixel to the first electrode 310 which is a pixel electrode. The driving gate electrode 155 is connected to the capacitor plate 158 connected to the switching drain electrode 174. The driving source electrode 176 and the other power storage plate 178 are connected to the common power supply line 172, respectively. A planarization layer 165 is disposed on the interlayer insulating layer 160 and the driving drain electrode 177 is electrically connected to the first electrode of the organic light emitting diode 300 through a contact hole formed in the planarization layer 1656. [ 310).

The switching thin film transistor 10 is operated by the gate voltage applied to the gate line 151 to transfer the data voltage applied to the data line 171 to the driving thin film transistor 20 . A voltage corresponding to the difference between the common voltage applied to the driving thin film transistor 20 from the common power supply line 172 and the data voltage transferred from the switching thin film transistor 10 is stored in the capacitor 80, The current corresponding to the voltage stored in the organic thin film transistor 20 flows into the organic light emitting element 300 through the driving thin film transistor 20 to cause the organic light emitting element 300 to emit light.

The organic light emitting diode 300 emits light according to a driving signal received from the wiring unit 200. The organic light emitting device 300 includes a first electrode 310 that is an anode, a second electrode 330 that is a cathode, and a second electrode 330 that are disposed between the first electrode 310 and the second electrode 330 And an organic light emitting layer 320. However, the first embodiment of the present invention is not limited thereto. For example, the first electrode 310 may be a cathode, and the second electrode 330 may be an anode.

In the first embodiment of the present invention, the organic light emitting diode display 101 has a top emission type structure. That is, light emitted from the organic light emitting layer 320 is emitted through the second electrode 330. Accordingly, in the first embodiment of the present invention, the first electrode 310 is formed of a reflective film, and the second electrode 330 is formed of a semi-transmissive film having light transmittance.

Wherein at least one metal selected from the group consisting of magnesium (Mg), silver (Ag), gold (Au), calcium (Ca), lithium (Li), chromium (Cr) Alloys may be used. At this time, the thickness of the reflective film and the semi-permeable film is determined. Generally, the semi-permeable membrane has a thickness of 200 nm or less.

The first electrode 310 may be formed of a reflective layer formed of a metal layer, and may have a structure in which a transparent conductive layer is stacked on a metal layer. That is, the first electrode 310 may have a multilayer structure including a reflective film and a transparent conductive film. The first electrode 310 may have a three-layer structure in which a transparent conductive layer, a reflective layer, and a transparent conductive layer are sequentially stacked.

The transparent conductive film may be made of a transparent conductive oxide (TCO) material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZnO (zinc oxide), or In ₂ O ₃ (Indium Oxide). The transparent conductive film has a relatively high work function. Therefore, when the first electrode 310 has a transparent conductive film, hole injection through the first electrode 310 is smooth.

For example, the first electrode 310 may have a three-layer structure of ITO-silver (Ag) -ITO. For conductivity, the silver (Ag) layer may be formed thicker than 200 nm.

The second electrode 330 is formed of a semi-transmissive film for top emission. That is, the second electrode 330 may be formed of one or more metals selected from the group consisting of magnesium (Mg), silver (Ag), gold (Au), calcium (Ca), lithium (Li), chromium (Cr) , And has a thickness of 200 nm or less for transparency. As the thickness of the semi-transparent film becomes thinner, the transmittance of light increases, but the resistance increases.

The second electrode 330 disposed on the display surface of the OLED display 101 according to the first embodiment of the present invention is formed as a common electrode over the entire surface of the first substrate 100. [ The voltage drop (IR DROP) occurs as the common electrode moves away from the power supply. In particular, in the case of a large-area organic light emitting display device, the voltage drop at the second electrode 330, which is a common electrode, is increased.

The organic light emitting diode display 101 includes an auxiliary wiring 400 to prevent a voltage drop at the second electrode 330. That is, power is supplied to the second electrode 300 through the auxiliary wiring 400 so that the voltage drop of the second electrode 330 is prevented. The auxiliary wiring 400 is disposed between the first electrodes 310 and forms a contact portion with the second electrode 330 in the middle of the auxiliary wiring so that the voltage is smoothly supplied to the second electrode 330.

The auxiliary wiring 400 is disposed on the first substrate 100 away from the first electrode 310. In FIG. 2, the auxiliary wiring 400 is disposed on the same layer as the first electrode 310. The auxiliary wiring 400 may be formed of the same material as that of the first electrode 310. For example, the auxiliary wiring 400 and the first electrode 310 can be formed all at once by a batch process. In this case, the auxiliary wiring 400 has the same configuration as the first electrode 310.

The auxiliary wiring 400 may be formed so as not to overlap with the data line 171. [ The auxiliary wiring 400 is arranged so as not to overlap with the data line 171 so that the capacitance CAP between the data line 171 and the auxiliary wiring 400 is reduced to suppress the RC increase of the data line 171 .

Therefore, the auxiliary wiring 400 disclosed in Figs. 1 and 2 is also formed of a material selected from the group consisting of Mg, Ag, Au, Ca, Li, Cr, A reflective film made of one or more metals or alloys thereof, and a laminated structure of the reflective film and the transparent conductive film. For example, the auxiliary wiring 400 may have a triple-layered structure of ITO-silver (Ag) -ITO, and the silver layer may be formed thicker than 200 nm for conductivity.

A pixel defining layer 190 is disposed on the first substrate 100 to isolate the plurality of first electrodes 310 from each other and define a light emitting region. The pixel defining layer 190 includes a first opening 195 and a second opening 405 in a region corresponding to the first electrode 310 and a region corresponding to the auxiliary wiring 400, respectively. The auxiliary wiring 400 is electrically connected to the second electrode 330 in the second opening 405 because part of the auxiliary wiring 400 is exposed between the pixel defining layer 190 by the second opening 405. Therefore, .

The first opening 195 of the pixel defining layer 190 exposes a portion of the first electrode 310. The first electrode 310, the organic emission layer 320, and the second electrode 330 are sequentially stacked in the opening 195 of the pixel defining layer 190.

At least one of a hole injection layer (HIL) and a hole transporting layer (HTL) may be disposed between the first electrode 310 and the organic light emitting layer 320, At least one of an electron transporting layer (ETL) and an electron injection layer (EIL) may be disposed between the organic light emitting layers 320. [

The organic light emitting layer 320, the hole injecting layer, the hole transporting layer, the electron injecting layer, and the electron transporting layer constitute an organic film.

2 shows a structure in which a hole injection layer 340 is disposed between the organic light emitting layer 320 and the first electrode 310 as an organic layer 360 and an electron injection layer 340 is formed between the organic light emitting layer 320 and the second electrode 320, (350) are arranged. The first embodiment of the present invention is not limited to this, and a hole injection layer may be further disposed between the organic light emitting layer 320 and the first electrode 312, or only the hole injection layer may be disposed. The electron injection layer may be further disposed between the two electrodes or only the electron injection layer may be disposed.

The hole injecting layer, the hole transporting layer, the electron injecting layer, and the electron transporting layer may be formed from known materials.

Each of the layers constituting the organic layer 360 may be disposed only on the first electrode 310 corresponding to the pixel region. However, not only the first electrode 310, but also the upper portion of the pixel defining layer 190 and the auxiliary wiring 400, As shown in FIG. The organic layers are mainly formed by deposition. In order to arrange the organic layer 360 only on the first electrode, a mask process using a mask must be performed. The mask process requires a process such as mask alignment, which complicates the process and increases the cost thereof. Therefore, the mask process is performed only during the process of forming the organic light emitting layer 320, and the mask process is not performed during the process of forming the hole injection layer, the hole transport layer, the electron injection layer, and the electron transport layer, It may be disposed over the entire surface of the substrate including the defining film 190 and the auxiliary wiring 400 to be a common layer. In the case of the organic light emitting layer, the blue light emitting layer may be formed as a common layer over the entire surface of the substrate.

However, when the organic layers are formed as a common layer, the organic layer 360 is also formed on the auxiliary wiring 400. [ In this case, if the second electrode 330 is formed on the organic layer 360, the auxiliary wiring 400 may not be electrically connected to the second electrode 330, The power supply is not properly supplied.

The organic layer 360 on the auxiliary wiring 400 includes the contact hole 450 so that the auxiliary wiring 400 can directly contact the second electrode 330. That is, when the organic layer 360 is formed on the auxiliary wiring 400, a part of the organic layer 360 disposed on the auxiliary wiring 400 is removed to form the contact hole 450, And the auxiliary wiring 400 is connected to the second electrode 330 through the contact hole 450.

A laser may be used to form the contact hole 450. By allowing the organic material 360 on the auxiliary wiring 400 to be selectively removed by the laser, the contact hole 450 can be formed with a simple and low cost.

The larger the area of the contact hole 450 is, in order to facilitate the electrical connection between the auxiliary wiring 400 and the second electrode 330. In addition, since the precision of the laser process is limited, the width of the auxiliary wiring 400 in the portion where the contact hole 450 is formed is preferably as wide as possible in order to facilitate the laser process. For example, the diameter of the contact hole formed by the laser may be about 50 占 퐉. In this case, it is preferable that the width of the auxiliary wiring is 60 占 퐉 or more in consideration of the redundancy in the process. However, if the width of the auxiliary wiring is increased, the area allocated to the first electrode 310 is reduced, and as a result, the area of the light emitting region will be reduced. In particular, since a high-resolution product has a small area allocated to pixels, it is necessary to efficiently utilize a narrow space. The organic light emitting display according to the first embodiment of the present invention has a wide width portion 410 having a relatively wide line width, and thus the width of the auxiliary wiring is limited, So that the auxiliary wiring 400 is connected to the second electrode 330 through the contact hole 450 in the wide portion 410.

For example, the width of the wide portion 410 may be 60 to 100 占 퐉, and the width of the contact hole 450 may be 50 to 90 占 퐉. In addition, the length of the wide portion 410 may vary depending on the arrangement of the pixels and the wiring direction, and should be at least as long as a contact hole can be formed. Therefore, the length of the wiring portion is set to be 60 mu m or more. Further, the auxiliary wiring where the contact hole 450 is formed is formed thick, so that the stability of the laser process can be improved.

The organic light emitting diode display 101 may include red, green, and blue pixels, each of which may have the same pixel area, but may be different from each other. When the pixel area is different, the area of the first electrode 310 corresponding to each pixel will also be different, and thus the interval between the first electrodes 310 will be different. Therefore, the width of the auxiliary wiring 400 is narrow in the region where the interval between the first electrodes 310 is narrow, and the width of the auxiliary wiring 400 in the region where the interval between the first electrodes 310 is wide . The wide portion 410 means a portion of the auxiliary wiring which is wide. The organic layer 360 has a contact hole 450 in the wide portion 410 and the second electrode 330 is connected to the wide portion 410 of the auxiliary wiring 400 through the contact hole 450 .

Although not shown in the drawing, a capping layer may be disposed on the organic light emitting device 300. The capping layer basically functions to protect the organic light emitting device 300 and to efficiently emit light generated in the organic light emitting layer 320 to the outside. Also, a thin-film encapsulation layer may be disposed on the capping layer.

In FIG. 2, the second substrate 500 is disposed on the organic light emitting device 300.

The second substrate 500 is a transparent insulating substrate made of glass, quartz, ceramics, plastic, or the like. The second substrate 500 is bonded and sealed with the first substrate 100 to cover the organic light emitting device 300. A sealant (not shown) may be disposed at the edges of the first substrate 100 and the second substrate 200 for sealing. At this time, the second substrate 500 and the organic light emitting diode 300 are separated from each other.

2, an air layer 510 is disposed in a space between the second substrate 500 and the organic light emitting device 300.

Although not shown in the drawing, a filler may be disposed in the space between the organic light emitting diode 300 and the second substrate 500 of the OLED display 101. The filler fills the inner space of the OLED display 102 instead of the air layer 510.

The filler 550 may be formed of an organic material, that is, a polymer. Since the filler fills the empty space inside the OLED display 102, the strength and durability of the OLED display 102 can be improved by the filler 550.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

3 schematically shows the arrangement of the first electrode and the auxiliary wiring in the organic light emitting display according to another example of the present invention.

The organic light emitting diode display device 102 shown in FIG. 3 has a structure in which the area of the first electrode 311 for the blue light emitting layer corresponding to the blue light emitting layer 321 is smaller than the area of the green light emitting layer 322 and the red light emitting layer 323 Is larger than the area of the first electrode 312 and the first electrode 313 for a red light emitting layer. Accordingly, the distance between the green light emitting layers 322 and the distance between the red light emitting layers 323 may be relatively wider than the interval between the blue light emitting layers 321. Thus, the auxiliary wiring 400 has a larger area between the green light emitting layers 322 and between the red light emitting layers 323. [ The auxiliary wiring 400 may have a wider portion 410 in the region between the green light emitting layers 322 or between the red light emitting layers 323 and the organic film 360 may be formed between the green light emitting layers 322 Or a contact hole 450 in the second opening 405 between the red light emitting layers 323.

The contact hole 450 may be circular or square, or may be a bar-shaped square.

Thus, the second electrode 330 is connected to the wide portion 410 of the auxiliary wiring 400 through the contact hole 450.

The above structure can be applied to the organic light emitting diode display device 102 in which the area of the blue light emitting layer is enlarged to reduce the lifetime of the blue light emitting layer. Luminescent materials used in organic light emitting display devices have different lifetimes depending on their color. Generally, the lifetime of a blue light emitting material is shorter than that of a green or red light emitting material. 3, the area of the blue light emitting layer 321 is wider than the area of the green light emitting layer 322 or the red light emitting layer 323 to reduce the load applied to the blue light emitting material.

The second embodiment of the present invention is not limited to the above structure, and the OLED display 102 according to the second embodiment of the present invention may further include a white light emitting layer.

Hereinafter, a third embodiment of the present invention will be described with reference to FIG.

4 schematically shows the arrangement of the first electrode and the auxiliary wiring of the organic light emitting display device 103 according to the third embodiment of the present invention.

The OLED display 103 shown in FIG. 4 includes one blue pixel, a green pixel, and a red pixel each including two organic light emitting layers and two first electrodes. Specifically, two blue light emitting layers 321a and 321b and two first electrodes 311a and 311b are formed in one blue pixel region, two green light emitting layers 322a and 322b in one green pixel region, The electrodes 312a and 312b are provided with two red light emitting layers 323a and 323b and two first electrodes 313a and 313b in one red pixel region. Here, the wide portion 410 and the contact hole 450 are disposed between the green pixel regions or between the red pixel regions.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 5 schematically shows the arrangement of the first electrode and the auxiliary wiring of the organic light emitting diode display device 104. As shown in FIG.

In FIG. 5, one green light emitting layer 322 and one red light emitting layer 323 are disposed under a region corresponding to one blue light emitting layer 321. The width of the auxiliary wiring 400 may be limited to about 37 mu m or less in order to secure the aperture ratio of the OLED display 104 having the above structure. In this case, since the width of the second opening 405 formed on the auxiliary wiring 400 will be about 27 μm or less, it is not easy to carry out the laser process for forming the contact hole 450. 5, the wide portion 410 is disposed in a space between at least one of the green light emitting layer 322 and the red light emitting layer 323 and the blue light emitting layer 321 to secure a space for forming the contact hole 450 .

An example of the present invention also provides a method of manufacturing an organic light emitting display device having an auxiliary wiring 400 including a wide portion 410.

6A to 6G, a method of manufacturing an OLED display device according to an exemplary embodiment of the present invention will be described.

First, a wiring portion 200 is formed on a first substrate 400 (FIG. 6A).

The switching thin film transistor 10 and the driving thin film transistor 20 are formed in the formation of the wiring part 200 and the capacitor element 80 is also formed. Since the wiring portion 200 has been described above, a detailed description thereof will be omitted.

A planarization layer 165 is formed on the interlayer insulating layer 160 of the wiring portion 200 and a contact hole for connecting the drain electrode 177 and the first electrode 310 is formed in the planarization layer 165. The first electrode 310 and the auxiliary wiring 400 are spaced apart from each other on the planarization layer 165 (FIG. 6B).

The first electrode 310 and the auxiliary wiring 400 may be formed by the same process. That is, the step of forming a plurality of first electrodes 310 on the first substrate 100 and the step of forming at least one auxiliary wiring 400 spaced apart from the first electrode 310 may be performed simultaneously have.

In the step of forming the auxiliary wiring 400, a wide portion 410 having a wide line width is formed in the auxiliary wiring 400. Specifically, the first electrodes 310 are formed at different intervals between the neighboring first electrodes 310, and the width of the auxiliary wiring 400 is set to a wide range between the first electrodes 310 A portion 410 is formed.

A pixel defining layer 190 is formed on the first substrate 100. At this time, a first opening portion 195 and a second opening portion 405 corresponding to the first electrode 310 and the auxiliary wiring 400 are formed in the pixel defining layer 190 (FIG. 6C).

Then, an organic film 360 is formed (Fig. 6D).

In the step of forming the organic layer 360, an organic light emitting layer 320 is formed on the first electrode 310 corresponding to at least the first opening 195. The organic light emitting layer 320 may be formed only on the first opening 195 or may be formed on the entire region of the first substrate 400 including the pixel defining layer 195 and the auxiliary wiring 400.

In the process of forming the organic layer 360, at least one of a hole injection layer and a hole transport layer may be formed on the first electrode 310 before the organic light emitting layer 320 is formed. In FIG. 6D, a hole injection layer 340 is formed as an organic layer between the organic emission layer 320 and the first electrode 310.

In addition, after the organic light emitting layer 320 is formed, at least one of the electron transporting layer and the electron injecting layer may be formed on the organic light emitting layer 320. In FIG. 6D, an electron transporting layer 350 is disposed as an organic film on the organic light emitting layer 320.

Only a hole injection layer may be disposed between the organic light emitting layer 320 and the first electrode 312 and only an electron injection layer may be disposed between the organic light emitting layer 320 and the second electrode.

The hole injecting layer, the hole transporting layer, the electron injecting layer, and the electron transporting layer may be formed from known materials.

The hole injection layer 340 and the electron transport layer 350 are formed not only on the organic emission layer 320 but also on the pixel defining layer 190 and the auxiliary electrode 400.

The organic film formed on the auxiliary wiring 400 is partially removed. At this time, a laser L is used (Fig. 6E). Specifically, the wide portion 410 of the auxiliary electrode 400 is partially irradiated with the laser L. As a result, a part of the organic film 360 disposed on the wide portion 410 of the auxiliary wiring 400 is removed to form the contact hole 450 (FIG. 6F).

Next, a second electrode 330 is formed on the organic film 360 (Fig. 6G). The second electrode 330 is also connected to the auxiliary wiring 400 by disposing the second electrode 330 in the contact hole 450 formed in the wide portion 410 in the process of forming the second electrode 330 . That is, the second electrode 330 is connected to the auxiliary wiring 400 through the contact hole 450.

The contact hole 450 is easily formed in the auxiliary wiring 400 by the method described above so that the second electrode 330 is easily connected to the auxiliary wiring 400. [

A second substrate 500 facing the first substrate is spaced apart from the second electrode 330 to complete the OLED display 101.

Although not shown, a capping layer may be formed on the second electrode 330, and a thin-film encapsulation layer may be formed on the capping layer. The step of forming the thin film encapsulation layer may include at least one step of forming the organic layer and the step of forming the inorganic layer.

The present invention has been described above with reference to the drawings and examples. It is to be understood that the drawings and the embodiments described above are merely illustrative, and that those skilled in the art will be able to come up with various modifications and equivalent embodiments. Accordingly, the scope of protection of the present invention should be determined by the technical idea of the appended claims.

10: switching thin film transistor 20: driving thin film transistor
80: electric storage element 100: substrate
120: buffer layer 130: gate insulating film
132: semiconductor layer 155: gate electrode
160: interlayer insulating film 165: planarization layer
176: source electrode 177: drain electrode
190: pixel defining film 195: first opening
200: wiring part 300: organic light emitting element
310, 311, 312, 313: First electrodes 320, 321, 322, 323:
330: second electrode 360: organic film
400: auxiliary wiring 405: second opening
410: wide portion 450: contact hole
500: second substrate

Claims (18)

A first substrate;
A plurality of first electrodes disposed on the first substrate;
At least one auxiliary wiring disposed on the first substrate so as to be spaced apart from the first electrode;
A pixel defining layer disposed on the first substrate and corresponding to the first electrode and the auxiliary wiring and having a first opening and a second opening, respectively;
An organic layer disposed on at least a first electrode corresponding to the first opening, the organic layer including an organic light emitting layer; And
And a second electrode disposed on the organic film,
Wherein the auxiliary wiring has a wide portion with a large line width,
And a wide portion of the auxiliary wiring is connected to the second electrode. The method according to claim 1,
Wherein the organic film is disposed on the auxiliary wiring,
Wherein the organic film has a contact hole in the second opening,
And the wider portion of the auxiliary wiring is connected to the second electrode through the contact hole. The OLED display of claim 2, wherein the organic layer comprises at least one of a hole injection layer and a hole transport layer disposed between the first electrode and the organic light emitting layer. The OLED display of claim 2, wherein the organic layer comprises at least one of an electron transport layer and an electron injection layer disposed between the organic light emitting layer and the second electrode. The organic light emitting display according to claim 1, wherein the auxiliary wiring is disposed on the same layer as the first electrode. The OLED display according to claim 1, wherein the auxiliary wiring and the first electrode are made of the same material. The organic light emitting display according to claim 6, wherein the auxiliary wiring and the first electrode comprise a metal layer. The organic light emitting display according to claim 1, wherein the plurality of first electrodes have different intervals, and the wide portion is provided at a wide interval between the first electrodes. The OLED display of claim 1, wherein the organic light emitting layer includes a red light emitting layer, a green light emitting layer, and a blue light emitting layer. The organic light emitting display according to claim 9, wherein the wide portion is disposed between the red light emitting layers or between the green light emitting layers. The organic light emitting display according to claim 9, wherein a wide portion is disposed in a space between at least one of the green light emitting layer and the red light emitting layer and the blue light emitting layer. Forming a plurality of first electrodes on a first substrate;
Forming at least one auxiliary wiring on the first substrate and spaced apart from the first electrode;
Forming a pixel defining layer on the first substrate, the pixel defining layer having a first opening and a second opening respectively corresponding to the first electrode and the auxiliary wiring;
Forming an organic film including an organic light emitting layer on a first electrode corresponding to at least a first opening; And
And forming a second electrode on the organic film,
The auxiliary wiring includes a wide portion having a wide line width,
Wherein the second electrode is connected to the wide portion of the auxiliary wiring in the step of forming the second electrode. 13. The method according to claim 12, wherein in the organic film formation step, the organic film is disposed on the sub-
And forming a contact hole by removing a portion of the organic film disposed in the second opening before forming the second electrode after the organic film formation step. 14. The method of claim 13, wherein, in the forming of the second electrode, the second electrode is connected to the wide portion of the auxiliary wiring through the contact hole. The organic light emitting display according to claim 12, wherein the organic layer forming step includes forming at least one of a hole injection layer and a hole transport layer on the first electrode before forming the organic light emitting layer. Way. The organic light emitting diode display according to claim 12, wherein the organic layer forming step includes forming at least one of an electron transport layer and an electron injection layer on the organic light emitting layer after forming the organic light emitting layer . 13. The method of claim 12, wherein the forming of the first electrode and the forming of the auxiliary wiring are performed in the same process. 13. The method of claim 12, wherein, in the step of forming the first electrode, the first electrode is formed such that intervals between the first electrodes are different from each other,
And the wide portion of the auxiliary wiring is disposed at a wide portion between the first electrodes in the step of forming the auxiliary wiring.

Images