KR102595445B1 - Organic light emitting diode display and manufacturing method of the same - Google Patents

Abstract

An organic light emitting display device having uniform luminance according to an embodiment of the present invention is provided. A flat layer with a contact hole is disposed on the substrate on which the auxiliary electrode is disposed. The contact hole of the flat layer has an undercut structure at the contact point with the auxiliary electrode, and the organic light-emitting layer has a discontinuous section in the undercut structure of the contact hole, and the common electrode is connected to the auxiliary electrode inside the undercut structure. By connecting the auxiliary electrode and the common electrode through a contact hole having an undercut structure of a flat layer, uniform luminance of the organic light emitting display device can be maintained.

Description

Organic light emitting display device and manufacturing method thereof {ORGANIC LIGHT EMITTING DIODE DISPLAY AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to an organic light emitting display device and a method of manufacturing the same. More specifically, in order to maintain uniform luminance of the organic light emitting display device, a separate additional process is required by using an undercut structure to connect the common electrode to the auxiliary electrode. The present invention relates to an organic light emitting display device capable of achieving large size and high resolution by providing a new connection structure capable of connecting an auxiliary electrode and a common electrode without a single electrode, and a method of manufacturing the same.

An organic light emitting display (OLED) is a self-emitting display device. Unlike a liquid crystal display (LCD), an organic light emitting display (OLED) does not require a separate light source and can be manufactured in a lightweight and thin form. In addition, organic light emitting display devices are not only advantageous in terms of power consumption due to low voltage driving, but also have excellent color rendering, response speed, viewing angle, and contrast ratio (CR), and are being studied as next-generation display devices.

Organic light emitting display devices (OLEDs) can be divided into a top emission type and a bottom emission type depending on the transmission direction of light emitted through the organic light emitting element. In the bottom light emitting method, the light emitting area is inevitably limited as thin film transistors (driving elements) and wiring electrodes for driving organic light emitting devices are arranged for each pixel, so the top light emitting method is mainly used in recent years.

A typical top-emission organic light emitting display device includes a driving element (thin film transistor) disposed on a substrate, a driving element protection layer (passivation) and a flat layer (over coat) that cover the driving element and protect the driving element. and includes a pixel electrode (anode) and a common electrode (cathode) for driving the organic light emitting layer.

As the pixel electrode, a conductive material with a relatively high work function value, such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), may be used. In particular, the pixel electrode may be composed of at least two or more layers containing a metal material with excellent reflection efficiency, such as silver (Ag) or APC (Ag; Pb; Cu). Recently, pixel electrodes with a triple stack structure of ITO/Ag alloy/ITO are mainly used.

Since an organic light emitting display device has a plurality of pixels and emits light by electrons and holes injected into an organic light emitting layer disposed in each pixel, uniform supply of current applied to the organic light emitting display device is important.

This general top-emitting type organic light emitting display device mainly uses a top common electrode connected to a plurality of pixels, and since it is a top-emitting type, a transparent conductive material that transmits light is used.

Transparent conductive materials have higher electrical resistance than metals, so when implementing a large-scale top-emission organic light emitting display device, the electrical resistance of the common electrode cannot be maintained uniformly, making it difficult to maintain uniform luminance of the organic light emitting display device. There may be difficulties.

Accordingly, in order to enlarge organic light emitting display devices, many research projects are being conducted on structures that can uniformly supply current to organic light emitting devices.

An organic light emitting display device arranges a plurality of pixels including organic light emitting elements to display a user's desired image by emitting light from the organic light emitting elements.

An organic light emitting device includes two electrodes and an organic layer. At this time, the organic layer includes an organic light-emitting layer, and may further include a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, etc., for smooth exciton formation.

One of the two electrodes is a pixel electrode connected to the driving element, and an organic light emitting display (OLED) is a self-emitting display device. Unlike a liquid crystal display (LCD), it does not require a separate light source and can be manufactured in a lightweight and thin form. . In addition, organic light emitting display devices are not only advantageous in terms of power consumption due to low voltage driving, but also have excellent color rendering, response speed, viewing angle, and contrast ratio (CR), and are being studied as next-generation display devices.

Organic light emitting display devices (OLEDs) can be divided into a top emission type and a bottom emission type depending on the transmission direction of light emitted through the organic light emitting element. In the bottom light emitting method, the light emitting area is inevitably limited as thin film transistors (driving elements) and wiring electrodes for driving organic light emitting devices are arranged for each pixel, so the top light emitting method is mainly used in recent years.

A typical top-emission organic light emitting display device includes a driving element (thin film transistor) disposed on a substrate, a driving element protection layer (passivation) and a flat layer (over coat) that cover the driving element and protect the driving element. and includes a pixel electrode (anode) and a common electrode (cathode) for driving the organic light emitting layer.

As the pixel electrode, a conductive material with a relatively high work function value, such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), may be used. In particular, the pixel electrode may be composed of at least two or more layers containing a metal material with excellent reflection efficiency, such as silver (Ag) or APC (Ag; Pb; Cu). Recently, pixel electrodes with a triple stack structure of ITO/Ag alloy/ITO are mainly used.

Since an organic light emitting display device has a plurality of pixels and emits light by electrons and holes injected into an organic light emitting layer disposed in each pixel, uniform supply of current applied to the organic light emitting display device is important.

This general top-emitting type organic light emitting display device mainly uses a top common electrode connected to a plurality of pixels, and since it is a top-emitting type, a transparent conductive material that transmits light is used.

Transparent conductive materials have higher electrical resistance than metals, so when implementing a large-scale top-emission organic light emitting display device, the electrical resistance of the common electrode cannot be maintained uniformly, making it difficult to maintain uniform luminance of the organic light emitting display device. There may be difficulties.

Accordingly, in order to expand the size of the organic light emitting display device, the organic light emitting display device arranges a plurality of pixels including organic light emitting elements to display a user's desired image by emitting light from the organic light emitting elements.

An organic light emitting device includes two electrodes and an organic layer. At this time, the organic layer includes an organic light-emitting layer, and may further include a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, etc., for smooth exciton formation.

One of the two electrodes may be a pixel electrode connected to the driving element, and the other may be a common electrode (cathode).

In the case of an upward-emitting organic light emitting display device (Top emission), the common electrode generally uses a transparent electrode. Transparent electrodes have a high resistance value, so the organic light emitting device decreases from the periphery to the center of the organic light emitting display device. The brightness of the supplied current decreases due to an increase in the electrical resistance of the electrode.

In order to overcome the lowered luminance in the center, an auxiliary electrode can be placed in the organic light emitting display device and connected to the common electrode to lower the electrical resistance of the common electrode and keep it constant.

To connect the auxiliary electrode disposed on the top of the organic light-emitting layer and the common electrode disposed on the bottom of the organic light-emitting layer, a structure with an inverted taper structure including a partition is placed on the auxiliary electrode to induce a discontinuous section of the organic light-emitting layer and form a discontinuous section. The open auxiliary electrode and the common electrode can be electrically connected.

The connection method of this reverse taper structure is a connection method that utilizes the step coverage difference between the organic light-emitting layer and the common electrode. When an auxiliary electrode is formed at the bottom of the barrier structure and the organic light-emitting layer and the common electrode are deposited, the common electrode is the organic light-emitting layer. Since the step coverage is high compared to that, it can be placed including the side of the partition wall structure, and can be electrically connected to the auxiliary electrode at the lower part of the partition structure.

The partition wall structure can use a polyimide-based material. However, these barrier structures have the disadvantage of being prone to collapse during the manufacturing process and lowering the aperture ratio of the organic light emitting display device. Additionally, since an additional process is required to form the barrier structure, there is a disadvantage that the manufacturing cost of the organic light emitting display device may increase. Accordingly, the inventors of the present invention invented an auxiliary electrode connection structure for an organic light emitting display device that can connect an auxiliary electrode and a common electrode without using a partition structure.

The problem to be solved according to one embodiment of the present invention is to open the auxiliary electrode by inducing a discontinuous section of the organic light emitting layer by placing a contact hole including an undercut structure on the auxiliary electrode, and to connect the open auxiliary electrode and the common electrode to provide high resolution. To provide an organic light emitting display device capable of producing a large area and a method of manufacturing the same.

Another problem to be solved according to an embodiment of the present invention is to provide an organic light emitting display device in which one side of the contact hole has an undercut shape and the other side has an inclined surface shape to increase the connection success rate between the common electrode and the auxiliary electrode, and a manufacturing method thereof. It is provided.

The problems to be solved according to an embodiment of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention, an organic light emitting display device is provided that can maintain uniform luminance of the organic light emitting display device by connecting a common electrode to the auxiliary electrode by disposing a contact hole having an undercut on the auxiliary electrode. There is a driving element and an auxiliary electrode on the substrate, and a driving element protection layer and a flattening layer on the driving element. There is a pixel electrode, an organic light emitting layer, and a common electrode on the flat layer, and the driving element protection layer and the flat layer have a contact hole that opens the auxiliary electrode. The first side of the contact hole has the shape of an undercut, and the other side has the shape of an inclined plane. . The organic light-emitting layer is discontinuous on the inside of the undercut shape, and the common electrode is electrically connected to the auxiliary electrode on the inside of the undercut shape to have uniform electrical resistance. At this time, the inclined surface of the contact hole allows the common electrode to be more smoothly placed inside the undercut. In this way, by disposing a contact hole having an undercut and an inclined surface on the auxiliary electrode, the electrical resistance of the common electrode can be made constant, thereby providing an organic light emitting display device with uniform brightness.

A method of manufacturing an organic light emitting display device according to an embodiment of the present invention is provided. A driving element and an auxiliary electrode are formed on the substrate. A driving element protective layer and a flattening layer are formed on the driving element, and a pixel electrode, an organic light emitting layer, and a common electrode are formed on the flattening layer. At this time, the driving element protective layer and the flat layer are formed with contact holes to open the auxiliary electrode, with one side having an undercut shape and the other side having an inclined surface. As described above, when the organic light emitting layer and the common electrode are formed, the common electrode and the auxiliary electrode can be electrically connected inside the undercut shape formed in the contact hole, thereby providing an organic light emitting display device with uniform brightness. .

According to an embodiment of the present invention, the luminance uniformity of the organic light emitting display device can be improved by providing a connection structure through a contact hole in the flat layer to electrically connect the auxiliary electrode and the common electrode to make the current of the common electrode uniform. There is an effect.

Additionally, arranging the contact hole to have an undercut shape and an inclined surface shape has the effect of improving the connection ratio between the common electrode and the auxiliary electrode.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

Since the content of the invention described above in the problem to be solved, the means for solving the problem, and the effect do not specify the essential features of the claim, the scope of the claim is not limited by the matters described in the content of the invention.

1 is a schematic cross-sectional view of an organic light emitting display device to illustrate the connection between a common electrode and an auxiliary electrode according to an embodiment of the present invention.
2A to 2F are schematic cross-sectional views for explaining a method of manufacturing an organic light emitting display device according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be combined or combined with each other, partially or entirely, and various technological interconnections and operations are possible, and each embodiment can be implemented independently of each other or together in a related relationship. It may be possible.

Below, the connection structure of the auxiliary electrode and the common electrode, including the contact hole, according to an embodiment of the present invention will be described.

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

1 is a schematic cross-sectional view of an organic light emitting display device to illustrate the connection between a common electrode and an auxiliary electrode according to an embodiment of the present invention.

Referring to FIG. 1 , the organic light emitting display device 100 includes a driving element 120, an auxiliary electrode 130, and a pad electrode 140 disposed on a substrate 110.

The substrate 110 may be a glass substrate or a polyimide-based flexible substrate. A barrier layer 112 may be disposed on the substrate 110 to minimize penetration of moisture and oxygen. Additionally, the substrate 110 may include an alignment mark 111 for process alignment.

The driving element 120 may be a thin film transistor using amorphous silicon, polycrystalline silicon, or an oxide semiconductor. Additionally, the driving element 120 includes a gate electrode 121, a gate insulating film 122, an active layer 123, and a source electrode and a drain electrode 124. It may further include an interlayer layer 113, which is an inorganic layer to prevent conduction between the source electrode and the drain electrode 124 and to prevent contamination and damage to the lower part of the gate electrode 121. In Figure 1, the driving element 120 is shown as a top gate with a gate electrode 121 on the active layer 123, but the gate electrode 121 is a bottom gate on the active layer 123 and It may be a driving element of a gate.

The gate electrode 121 is made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be made of an alloy, but is not limited to this, and may be formed of various materials.

Additionally, the gate electrode 121 may be made of, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). ) may be a multi-layer made of any one selected from the group consisting of or an alloy thereof.

The source and drain electrodes 124, pad electrode 140, and auxiliary electrode 130 that make up the driving element 120 are arranged on the same plane using the same material, so that the arrangement process can be simplified. It can be made of a low-resistance metal material such as copper (Cu) for smooth signal transmission.

These source and drain electrodes 124, pad electrode 140, and auxiliary electrode 130 may be disposed using materials such as copper (Cu) or silver (Ag), but may be disposed on an inorganic material layer or an organic material layer. Since there may be problems with adhesion, an additional moly titanium (MoTi) layer may be included, and an ITO or IZO layer may be further included since it may be damaged in processes such as etching following electrode placement. there is. To explain in more detail, the source and drain electrodes 124, pad electrode 140, and auxiliary electrode 130 may be electrodes having a multilayer structure of MoTi, Cu, and ITO. In some embodiments, the auxiliary electrode 130 may be made of the same material as the gate electrode 121 rather than the source and drain electrodes 124.

A driving element protection layer 114 is disposed on the driving element 120 to protect the driving element 120 from damage during subsequent processes, and a flat layer 115 and An organic light emitting device 150 is disposed.

The organic light emitting device 150 includes a pixel electrode 151, an organic light emitting layer 152, and a common electrode 153 disposed on a flat layer 115, and the pixel electrode 151 is electrically connected to the driving device 120. It is connected to To be more specific, the pixel electrode 151 is electrically connected to the source electrode and drain electrode 124 of the driving element 120 through the pixel electrode connection portion 116.

The organic light emitting layer 152 emits light by electrons and holes injected from the pixel electrode 151 and the common electrode 153, and is composed of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer to smoothly form exciton. It may include, and may be an organic light-emitting layer with a multi-layer structure including at least two light-emitting layers.

The pixel electrode 151 and the common electrode 153 may be an anode electrode or a cathode electrode, and may be transparent electrodes capable of transmitting light emitted from the organic light emitting layer 152, and emit light in one direction. One of the two electrodes may be a reflective electrode to induce .

Additionally, a bank layer 190 is disposed around the pixel electrode 151 to distinguish pixels.

The driving element protection layer 114 on the pad electrode 140 is provided with a pad open portion 141 that opens the pad electrode 140 and a contact hole 160 that opens the auxiliary electrode 130.

The contact hole 160 is arranged to have an undercut shape 161 on one side and an inclined surface shape 162 on the other side according to the difference in openness between the layers consisting of the driving device protection layer 114 and the flat layer 115. Here, the slope shape 162 may be a step shape made of a protective layer 114 and a flat layer 115, as shown in FIG. 1 .

At least a portion of the inclined surface shape 162 of the contact hole 160 may be covered by the bank layer 170, or the inclined surface shape 162 consisting only of the driving device protection layer 114 and the flat layer 115. It can be.

The auxiliary electrode 130 and the common electrode 153 are electrically connected inside the undercut shape 161 in the contact hole 160, and the contact hole 160 having the undercut shape 151 is connected to the auxiliary electrode 130. ) is opened, and the organic light emitting layer 152 is not disposed inside the undercut shape 161 but becomes discontinuous. The discontinuous and open auxiliary electrode 130 is electrically connected during the process of disposing the common electrode 153. do.

Because the common electrode 153 has a higher step coverage than the organic light emitting layer 152, the organic light emitting layer 152 is discontinuous inside the undercut shape 161, and the common electrode 153 has a high step coverage. It is disposed inside the undercut shape 161 and is electrically connected to the auxiliary electrode 130.

2A to 2F are schematic cross-sectional views for explaining a method of manufacturing an organic light emitting display device according to an embodiment of the present invention.

Referring to FIG. 2A , the driving element 220, the pad electrode 240, and the auxiliary electrode 230 are formed on the substrate 210. The substrate 210 may include a buffer layer 212 and may include forming an alignment mark 211 on the substrate 210 for process alignment.

The driving element 220 forms an active layer 223, followed by a gate insulating film 222 and a gate electrode 221, and forms an interlayer layer 213 to insulate the gate electrode 221. Next, the source electrode and the drain electrode 224 are formed, and the source electrode and the drain electrode 224 are formed to be electrically connected to the active layer 223, respectively.

The pad electrode 240, the source and drain electrodes 224, and the auxiliary electrode 230 can be formed simultaneously using the same material.

The pad electrode 240, the source and drain electrodes 224, and the auxiliary electrode 230 are formed using a material with low electrical resistance, such as copper (Cu) or silver (Ag). Since Ag) has low deposition stability, moly titanium (MoTi) is formed first and then copper (Cu) or silver (Ag) is formed to increase deposition stability. In addition, copper (Cu) or silver (Ag) is highly likely to corrode in the subsequent process, so ITO or IZO is formed on top of copper (Cu) or silver (Ag).

In this way, process stability can be further improved by forming the pad electrode 240, the source and drain electrodes 224, and the auxiliary electrode 230 into a multi-layer electrode structure.

Referring to Figure 2b, a driving element protection layer 214 that protects the driving element 220 is formed on the driving element 220, and a pixel electrode connection part that opens one of the source electrode and the drain electrode 224. It forms (216).

Next, a flat layer 215 is formed on the driving device protection layer 214 using a material such as resin, but does not cover the pad electrode 240, the pixel electrode connection portion 216, and the auxiliary electrode 230. form so as not to

The step of forming the pixel electrode connection portion 216 on the protective film 241 can be performed using a dry or wet etch process or a plasma etch process.

Next described with reference to FIG. 2C, the pixel electrode 251 is formed on the flattening layer 215. The pixel electrode 251 is electrically connected to the source electrode and the drain electrode 224 through the pixel electrode connection portion 216 to receive electrical signals and current from the driving element 220.

Next, as shown in FIG. 2D, a pad open portion 241 is formed on the driving device protection layer 214 to open the pad electrode 240, and the driving device protection layer 214 is formed on the auxiliary electrode 230. It opens to form a contact hole 260.

When forming the contact hole 260, one side is formed to have an undercut shape (261) and the other side is formed to have an inclined surface shape (262). A method of forming the contact hole 260 to have an undercut shape 261 and an inclined surface shape 262 can be formed by utilizing a process margin and using a process such as etching the driving device protection layer 214.

Next, referring to FIG. 2E, a bank layer 270 is formed around the pixel electrode 251. The bank layer 270 may be arranged to cover at least part of the contact hole 260, and when arranged to cover at least part of the contact hole 260, one side of the contact hole 260 has an inclined surface 262. It can be formed more efficiently.

Next, as shown in FIG. 2F, the organic light emitting layer 252 and the common electrode 253 are formed to form the organic light emitting device 250. At this time, since the step coverage of the organic light emitting layer 252 is not high enough to be formed inside the undercut shape 261 of the contact hole 260, a discontinuous section is formed. However, the common electrode 253 has a higher step coverage than the organic light emitting layer 252, so it is formed inside the undercut shape 261 of the contact hole 260 and is connected to the auxiliary electrode 230 opened by the contact hole 260. do.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

100: Organic light emitting display device
110, 210: substrate
111, 220: Alignment mark
112, 212: buffer layer
113, 213: Interlayer layer
114, 214: Drive element protection layer
115, 215: Flat layer
116, 216: Pixel electrode connection part
120, 220: driving element
130, 230: Auxiliary electrode
140, 240: Pad electrode
150, 250: Organic light emitting device
160, 260: Contact hole
170, 270: Bank layer

Claims (19)

delete Drive elements and auxiliary electrodes on the substrate;
an organic light-emitting device disposed on the driving device and including a pixel electrode, an organic light-emitting layer, and a common electrode; and
It includes a bank layer disposed on the pixel electrode,
Includes a contact hole for opening the auxiliary electrode,
The organic light emitting layer extends from one side of the contact hole and is disposed to contact the top surface of the auxiliary electrode, and is discontinuously disposed between the top surface of the auxiliary electrode and the other side of the contact hole. According to paragraph 2,
The organic light emitting display device wherein the bank layer is disposed on the contact hole so that the bottom of the bank layer includes only an inclined surface that protrudes inside the contact hole more than the top of the bank layer. According to paragraph 2,
The bank layer includes a plurality of inclined surfaces disposed on the contact hole, and the organic light emitting layer disposed on the auxiliary electrode extends to at least two inclined surfaces. According to paragraph 2,
An organic light emitting display device further comprising a protective layer on the driving element. According to clause 5,
The organic light emitting display device further includes a planarization layer disposed on the protective layer. According to clause 6,
An organic light emitting display device in which an eaves shape is disposed on the other side of the contact hole, with the upper end of the protective layer receding to an outer side of the contact hole than the lower end of the planar layer. In clause 7,
On the other side of the contact hole, the bank layer is disposed outside the contact hole beyond the top of the planar layer and the protective layer. According to clause 6,
The organic light emitting display device is disposed on one side of the contact hole so that the protective layer protrudes further inside the contact hole than the planar layer. According to clause 9,
The bank layer covers an end of the planar layer on one side of the contact hole, and the protective layer is disposed to protrude more inside the contact hole than the bank layer. According to paragraph 2,
An organic light emitting display device wherein the driving element includes a gate electrode, a source electrode, a drain electrode, and an active layer. According to clause 11,
The organic light emitting display device further includes a gate insulating film patterned and disposed under the gate electrode to have the same shape as the gate electrode. According to clause 12,
The organic light emitting display device wherein the driving element has a top gate structure with the gate electrode on the active layer. According to clause 11,
The organic light emitting display device wherein the auxiliary electrode is made of the same material as the source electrode, the drain electrode, or the gate electrode constituting the driving element. According to clause 11,
The source electrode and the drain electrode have a triple-layer structure. According to clause 15,
The source electrode and the drain electrode include a layer made of moly titanium (MoTi), a layer made of copper (Cu) or silver (Ag), and a layer made of indium tin oxide (ITO) or indium tin oxide (IZO). Organic light emitting display device. According to paragraph 2,
An organic light emitting display device disposed on the substrate and further comprising an alignment mark for process alignment. According to paragraph 2,
The organic light emitting layer is disposed on the bank layer. According to paragraph 2,
The organic light emitting layer may include a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer, and has a multilayer structure including at least two light emitting layers.