KR102680875B1 - organic light emitting display device - Google Patents

Abstract

An organic light emitting display device according to an embodiment of the present invention includes a substrate having a first sub-pixel area and a second sub-pixel area on which a thin film transistor, an anode, an organic light emitting layer, and a cathode are respectively disposed, the first sub-pixel area and the Between the second sub-pixel areas, a first auxiliary electrode disposed on the substrate, a planarization layer disposed on the first auxiliary electrode and including a contact hole exposing a portion of the first auxiliary electrode, the first auxiliary electrode A second auxiliary electrode is disposed on the planarization layer between the sub-pixel area and the second sub-pixel area and is electrically connected to the first auxiliary electrode through the contact hole, and the organic light-emitting layer includes the first auxiliary electrode. A short circuit (disconnection) occurs between the first sub-pixel area and the second sub-pixel area at the top of the second auxiliary electrode. In the organic light emitting display device according to an embodiment of the present invention, the voltage drop at the cathode is compensated by the first auxiliary electrode and the second auxiliary electrode, and the aperture ratio is reduced due to the arrangement of the first auxiliary electrode and the second auxiliary electrode. is minimized.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DISPLAY DEVICE}

The present invention relates to an organic light emitting display device, and more specifically, to an organic light emitting display device that can minimize a decrease in aperture ratio while compensating for a voltage drop phenomenon at the cathode.

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 displays.

In the case of a top emission type organic light emitting display device, a transparent or translucent electrode is used as a cathode to emit light emitted from the organic light emitting layer upward. In both cases of using a transparent electrode and a translucent electrode as the cathode, the thickness of the cathode is made thin to improve transmittance, and a decrease in the cathode thickness increases the electrical resistance of the cathode electrode. For this reason, in the case of a large-area organic light emitting display device, the voltage drop may become more severe as the distance from the voltage supply pad portion increases, which may cause problems with uneven luminance of the organic light emitting display device.

In order to minimize the voltage drop phenomenon at the cathode, a method of placing an auxiliary electrode at an appropriate location and electrically connecting the auxiliary electrode to the cathode is used.

FIG. 1A is a schematic plan view of a conventional organic light emitting display device including an auxiliary electrode, and FIG. 1B is a schematic cross-sectional view of a conventional organic light emitting display device taken along line Ib-Ib′ of FIG. 1A. FIG. 1A shows only the substrate 110, the first contact hole 142, and the second auxiliary electrode 152 of the conventional organic light emitting display device 100.

1A and 1B, the conventional organic light emitting display device 100 includes a substrate 110, a buffer layer 120, a thin film transistor 130, a gate insulating layer 135, an interlayer insulating layer 136, First auxiliary electrode 137, planarization layer 140, first contact hole 142, second contact hole 144, anode 150, second auxiliary electrode 152, bank layer 160, partition wall (170), an organic light-emitting layer 180, an organic material layer 182, a cathode 190, and a conductive layer 192.

The substrate 110 includes a first sub-pixel area SP1 and a second sub-pixel area SP2, and a first auxiliary electrode is provided between the first sub-pixel area SP1 and the second sub-pixel area SP2. 137), the second auxiliary electrode 152, the first contact hole 142 for electrically connecting the first auxiliary electrode 137 and the second auxiliary electrode 152, and the organic light emitting layer 180 for disconnecting A partition wall 170 is disposed.

The area between the first sub-pixel area SP1 and the second sub-pixel area SP2 is not an area that emits light. Therefore, in order to maximize the aperture ratio of the organic light emitting display device 100, it is necessary to minimize the width W1 between the first sub-pixel area SP1 and the second sub-pixel area SP2. However, in the conventional organic light emitting display device 100, the width and partition wall 170 for arranging the first contact hole 142 are arranged between the first sub-pixel area SP1 and the second sub-pixel area SP2. Since the width must be secured individually, there was a problem in that the width W1 between the first sub-pixel area SP1 and the second sub-pixel area SP2 increased.

Accordingly, the first auxiliary electrode 137, the second auxiliary electrode 152, the first contact hole 142, and the partition wall 170 are formed between the first sub-pixel area SP1 and the second sub-pixel area SP2. While compensating for the voltage drop phenomenon at the cathode 190, the width W1 between the first sub-pixel area SP1 and the second sub-pixel area SP2 is reduced to increase the aperture ratio of the organic light emitting display device 100. There is a need for new technologies that can minimize degradation.

[Related technical literature]

1. Organic electroluminescent device and manufacturing method thereof (Patent Application No. 10-2009-0061834)

The inventors of the present invention recognized the problems that arise when manufacturing a conventional organic light emitting display device including the auxiliary electrode as described above, and developed a method that can suppress the voltage drop at the cathode and reduce the aperture ratio of the organic light emitting display device. An organic light emitting display device with a new structure that can be minimized has been invented.

The problem to be solved by the present invention is to provide an organic light emitting display device that can minimize the voltage drop phenomenon caused by the cathode, which affects the luminance uniformity of the entire display.

Another problem to be solved by the present invention is to provide an organic light emitting display device that can solve the problem of a decrease in aperture ratio due to the arrangement of two auxiliary electrodes and a partition between sub-pixel areas.

The problems 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.

In order to achieve the above-described object, an organic light emitting display device according to an embodiment of the present invention includes a substrate having a first sub-pixel area and a second sub-pixel area on which a thin film transistor, an anode, an organic light emitting layer, and a cathode are respectively disposed. , between the first sub-pixel area and the second sub-pixel area, a first auxiliary electrode disposed on the substrate, a contact hole disposed on the first auxiliary electrode and exposing a portion of the first auxiliary electrode. A planarization layer including a second auxiliary electrode disposed on the planarization layer between the first sub-pixel area and the second sub-pixel area and electrically connected to the first auxiliary electrode through the contact hole. and wherein the organic light emitting layer is short-circuited (disconnected) between the first sub-pixel area and the second sub-pixel area and at the top of the second auxiliary electrode. In the organic light emitting display device according to an embodiment of the present invention, the voltage drop at the cathode is compensated by the first auxiliary electrode and the second auxiliary electrode, and the aperture ratio is reduced due to the arrangement of the first auxiliary electrode and the second auxiliary electrode. is minimized.

According to another feature of the present invention, the first auxiliary electrode may be made of the same material as the source electrode and drain electrode of the thin film transistor.

According to another feature of the present invention, the second auxiliary electrode may be made of the same material as the anode.

According to another feature of the present invention, the organic light emitting layer may be cut off by a partition between the first sub-pixel area and the second sub-pixel area.

According to another feature of the present invention, the second auxiliary electrode may include a first part in contact with the contact hole, and a second part having a higher level than the first part.

According to another feature of the invention, the second part can be at the same level as the anode.

According to another feature of the present invention, the partition wall may be arranged to cover the second portion.

According to another feature of the present invention, the partition wall may be arranged to cover only a portion of the first part among the first part and the second part.

According to another feature of the present invention, the cathode may be disposed to extend to the space between the partition wall and the first portion.

According to another feature of the present invention, the partition wall may include a first partition wall and a second partition wall disposed on the first partition wall.

According to another feature of the present invention, the first partition wall and the second partition wall may be made of different materials.

According to another feature of the present invention, the display device further includes a bank layer disposed between the first sub-pixel area and the second sub-pixel area, and the first barrier rib may be made of the same material as the bank layer.

According to another feature of the present invention, the first barrier rib may be made of a positive type photoresist, and the second barrier rib may be made of a negative type photoresist.

According to another feature of the present invention, the first barrier rib may have a positive taper shape, and the second barrier rib may have a reverse taper shape.

According to another feature of the present invention, the contact holes may be disposed on the substrate in the form of dots, lines, or mesh.

Specific details of other embodiments are included in the detailed description and drawings.

The present invention has the effect of minimizing the charge drop phenomenon at the cathode and improving the luminance uniformity of the organic light emitting display device by disposing two auxiliary electrodes between sub-pixel areas.

The present invention has the effect of implementing a high-resolution organic light emitting display device by inserting and placing a partition in a contact hole for electrically connecting two auxiliary electrodes.

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.

FIG. 1A is a schematic plan view of a conventional organic light emitting display device including an auxiliary electrode.
FIG. 1B is a schematic cross-sectional view of a conventional organic light emitting display device taken along line Ib-Ib′ of FIG. 1A.
FIG. 2A is a schematic plan view of an organic light emitting display device according to an embodiment of the present invention.
FIG. 2B is a cross-sectional view of an organic light emitting display device according to an embodiment of the present invention taken along line IIb-IIb′ of FIG. 2A.
Figure 3 is a schematic cross-sectional view of an organic light emitting display device according to another embodiment of the present invention.
Figure 4 is a schematic cross-sectional view of an organic light emitting display device according to another embodiment of the present invention.
Figure 5 is a schematic cross-sectional view of an organic light emitting display device according to another 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. In cases where 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.

When an element or layer is referred to as “on” another element or layer, it includes instances where the other layer or other element is directly on top of or interposed between the other element and the other element.

Although first, second, etc. are used to describe various elements, these elements 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.

Like reference numerals refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be combined or combined with each other partially or entirely, and various technical 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.

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

FIG. 2A is a schematic plan view of an organic light emitting display device according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view of the organic light emitting display device according to an embodiment of the present invention taken along line IIb-IIb′ of FIG. 2A. . FIG. 2A shows only the substrate 210, the first contact hole 242, and the partition wall 270 of the organic light emitting display device 200 according to an embodiment of the present invention.

2A and 2B, the organic light emitting display device 200 according to an embodiment of the present invention includes a substrate 210, a buffer layer 220, a thin film transistor 230, a gate insulating layer 235, and interlayer insulation. Layer 236, first auxiliary electrode 237, planarization layer 240, anode 250, second auxiliary electrode 252, bank layer 260, partition 270, organic light-emitting layer 280, organic material layer (282), a cathode (290), and a conductive layer (292).

The substrate 210 serves to support and protect various components of the organic light emitting display device 200. The substrate 210 may be made of a material having flexibility, for example, a polyimide-based material.

The substrate 210 is an area for displaying one color and includes a first sub-pixel area (SP1) and a second sub-pixel area (SP2). Each of the first sub-pixel area SP1 and the second sub-pixel area SP2 emits light of different colors, and specifically, one of red, green, blue, and white light is emitted.

A buffer layer 220 is disposed on the substrate 210. The buffer layer 220 prevents moisture or impurities from penetrating through the substrate 210 and flattens the upper part of the substrate 210. However, the buffer layer 220 is not absolutely necessary. Whether or not the buffer layer 220 is formed is determined based on the type of substrate 210 or the type of thin film transistor 230 used in the organic light emitting display device 200. And, the buffer layer 220 may be formed of a transparent material.

A thin film transistor 230 is disposed on the buffer layer 220. The thin film transistor 230 is disposed in each of the first sub-pixel area SP1 and the second sub-pixel area SP2. The thin film transistor 230 includes an active layer 231, a gate electrode 232, a source electrode 233, and a drain electrode 234. Specifically, the active layer 231 is formed on the buffer layer 220, and the gate insulating layer 235 is formed on the active layer 231 to insulate the active layer 231 and the gate electrode 232, A gate electrode 232 is formed on the gate insulating layer 235 to overlap the active layer 231, an interlayer insulating layer 236 is formed on the gate electrode 232 and the gate insulating layer 235, and an interlayer insulating layer 236 is formed on the gate insulating layer 235. A source electrode 233 and a drain electrode 234 are formed on the insulating layer 236. The source electrode 233 and the drain electrode 234 are electrically connected to the active layer 231. In this specification, for convenience of explanation, only the driving thin film transistor 230 is shown among various thin film transistors that can be included in the organic light emitting display device 200. Additionally, in this specification, the thin film transistor 230 is described as having a coplanar structure, but a thin film transistor with an inverted staggered structure may also be used.

A first auxiliary electrode 237 is disposed on the buffer layer 220. The first auxiliary electrode 237 is disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2. The first auxiliary electrode 237 transmits the Vss voltage to the cathode 290 and serves to compensate for the voltage drop at the cathode 290. The first auxiliary electrode 237 is electrically connected to the second auxiliary electrode 252 through the first contact hole 242 formed in the planarization layer 240. The first auxiliary electrode 237 may be disposed simultaneously with the source electrode 233 and the drain electrode 234 in the same process. Accordingly, the first auxiliary electrode 237 may be made of the same material as the source electrode 233 and the drain electrode 234, and may be disposed to have the same thickness as the source electrode 233 and the drain electrode 234.

A planarization layer 240 is disposed on the thin film transistor 230 and the first auxiliary electrode 237. The planarization layer 240 is a layer that flattens the upper part of the substrate 210, and is also referred to as an overcoating layer. The planarization layer 240 is made of acrylic resin, epoxy resin, phenolic resin, polyamides resin, polyimides resin, and unsaturated polyester resin. It may be coated with one or more of (unsaturated polyesters resin), poly-phenylenethers resin, poly-phenylenesulfides resin, and benzocyclobutene, but is not limited thereto. and can be formed from a variety of materials.

As shown in FIG. 2B, the planarization layer 240 includes a first contact hole 242 and a second contact hole 244. The first contact hole 242 and the second contact hole 244 are disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2. The first contact hole 242 serves to expose a portion of the first auxiliary electrode 237 so that the first auxiliary electrode 237 and the second auxiliary electrode 252 can be electrically connected. The second contact hole 244 serves to expose a portion of the source electrode 233 so that the source electrode 233 and the anode 250 can be electrically connected.

As shown in FIG. 2A, the first contact hole 242 is arranged in a line shape on the entire surface of the substrate 210. The arrangement of the first contact hole 242 and the arrangement of the second auxiliary electrode 252 and the partition wall 270 inserted into the first contact hole 242 correspond to each other. Accordingly, while the first contact hole 242 is arranged in a line shape on the front surface of the substrate 210, the second auxiliary electrode 252 and the partition wall 270 are also arranged in a line shape on the front surface of the substrate 210. However, the first contact hole 242 does not necessarily need to be arranged in a line shape on the front surface of the substrate 210, and may be arranged in a dot shape or a mesh shape. In this case, the second auxiliary electrode 252 and the partition wall 270 may also be arranged in a dot shape or a mesh shape on the front surface of the substrate 210.

An anode 250 is disposed on the planarization layer 240. As shown in FIG. 2B, the anodes 250 are arranged separately for each sub-pixel area (SP1, SP2). The anode 250 serves to apply voltage to the organic light emitting layer 280. The anode 250 is electrically connected to the source electrode 233 of the thin film transistor 230 through the second contact hole 244. Each anode 250 may be made of a transparent conductive material with a high work function. Here, the transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). Since the organic light emitting display device 200 is driven by a top emission method, the anode 250 may further include a reflector. In Figure 2b, for convenience of illustration, the anode 250 is expressed as one layer.

A second auxiliary electrode 252 is disposed on the planarization layer 240. The second auxiliary electrode 252 is disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2. The second auxiliary electrode 252 transmits the Vss voltage to the cathode 290 and serves to compensate for the voltage drop at the cathode 290. The second auxiliary electrode 252 is electrically connected to the first auxiliary electrode 237 through the first contact hole 242 formed in the planarization layer 240. The second auxiliary electrode 252 may be disposed simultaneously with the anode 250 in the same process. Accordingly, the second auxiliary electrode 252 may be made of the same material as the anode 250 and may be disposed to have the same thickness as the anode 250.

As shown in FIG. 2B, the second auxiliary electrode 252 includes a first portion 254 in contact with the first contact hole 242, and a second portion 256 having a higher level than the first portion 254. ) includes. The first part 254 of the second auxiliary electrode 252 is in direct contact with the first contact hole 242 of the planarization layer 240 and has a level lower than that of the anode 250. The second portion 256 of the second auxiliary electrode 252 is disposed on the upper surface of the planarization layer 240 and is at the same level as the anode 250.

The bank layer 260 is disposed to cover the edge of the anode 250 and the edge of the second auxiliary electrode 252. The bank layer 260 is disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2 and serves to divide the sub-pixel areas. Each of the bank layers 260 may be made of a transparent organic insulating material or a black material, but is preferably made of a positive type photoresist.

A partition 270 is disposed on the second auxiliary electrode 252. The partition wall 270 is disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2. And, as shown in FIG. 2B, the partition wall 270 is inserted into the first contact hole 242. As a result, the first auxiliary electrode 237 and the second auxiliary electrode are formed in the area on the substrate 210 where the first contact hole 242 is disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2. The electrode 252 and the partition wall 270 overlap vertically. The partition wall 270 is located on the entire side of the first part 254 of the second auxiliary electrode 252 and on the second part 256 of the second auxiliary electrode 252 to sufficiently fill the first contact hole 242. placed in some The partition 270 serves to separate the organic light emitting layer 280 of the first sub-pixel area SP1 from the organic light emitting layer 280 of the second sub-pixel area SP2.

The partition wall 270 may have a reverse taper shape. As shown in FIG. 2B, the cross-sectional area of the partition 270 increases as it moves away from the first auxiliary electrode 237, so that the area of the upper surface of the partition 270 may be larger than the area of the lower surface of the partition 270. . The partition wall 270 may be made of negative type photoresist so that the reverse taper shape can be easily implemented. The partition wall 270 may be disposed thicker than the bank layer 260 to separate the organic light emitting layer 280 and the cathode 290, for example, about 1 μm to 2.5 μm thick.

An organic light-emitting layer 280 is disposed on the anode 250. The organic light emitting layer 280 receives voltage from the anode 250 and the cathode 290 and serves to emit light of a specific color. As shown in FIG. 2B, the organic light emitting layer 280 is separated by a partition wall 270 and disposed separately in each sub-pixel area SP1 and SP2.

The organic light-emitting layer 280 may be formed by depositing an organic material on the entire surface of the substrate 210. At this time, if the organic light emitting layer 280 covers the entire exposed portion of the second auxiliary electrode 252, the electrical connection between the cathode 290 and the second auxiliary electrode 252 cannot be smoothly achieved. To prevent this problem, a structure in which a partition wall 270 is disposed on the second auxiliary electrode 252 is adopted. Since organic materials are generally composed of materials with low step coverage, even if the organic light-emitting layer 280 is formed by depositing an organic material on the entire surface of the substrate 210, the organic light-emitting layer 280 forms a partition wall. The top of the second auxiliary electrode 252 that overlaps the top surface of 270 is not covered. Therefore, even after the formation of the organic light emitting layer 280, the upper part of the second auxiliary electrode 252 overlapping the top surface of the partition 270 is exposed, so that the cathode 290 and the second auxiliary electrode 252 are electrically connected. Available physical space is secured.

An organic material layer 282 is disposed on the partition wall 270. The organic material layer 282 may be disposed simultaneously with the organic light-emitting layer 280 in the same process. Accordingly, the organic material layer 282 may be made of the same material as the organic light-emitting layer 280 and may be disposed to have the same thickness as the organic light-emitting layer 280.

A cathode 290 is disposed on the organic light emitting layer 280. The cathode 290 is connected to a separate Vss voltage line and serves to apply a voltage to the organic light emitting layer 280. The cathode 290 is in contact with the second auxiliary electrode 252 and is electrically connected to the first auxiliary electrode 237 through the second auxiliary electrode 252. The voltage drop at the cathode 290 can be sufficiently improved by the first auxiliary electrode 237 and the second auxiliary electrode 252. The cathode 290 may be made of a metallic material with a low work function, such as silver (Ag), titanium (Ti), aluminum (Al), molybdenum (Mo), or an alloy of silver (Ag) and magnesium (Mg). there is. The cathode 290 is made of transparent material such as indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin zinc oxide (ITZO) to ensure step coverage. It may further include a layer composed of a conductive material. In FIG. 2B, for convenience of illustration, the cathode 290 is expressed as one layer.

A conductive layer 292 is disposed on the organic layer 282 on the partition wall 270. The conductive layer 292 may be disposed simultaneously with the organic cathode 290 in the same process. Accordingly, the conductive layer 292 may be made of the same material as the cathode 290 and may be disposed to have the same thickness as the cathode 290.

In a typical organic light emitting display device, a first contact hole for electrically connecting the first auxiliary electrode and the second auxiliary electrode is formed in the planarization layer between the first sub-pixel area and the second sub-pixel area, and an organic light-emitting layer is formed. A partition for disconnection is disposed on the second auxiliary electrode. Accordingly, the width for forming the first contact hole and the width for arranging the partition must be secured separately between the first sub-pixel area and the second sub-pixel area, so that the first sub-pixel area and the second sub-pixel area There was a problem that the width between areas increased. In an organic light emitting display device with a constant display area, when the width between the first sub-pixel area and the second sub-pixel area increases, the aperture ratio of the organic light emitting display device decreases. Therefore, a new technology is required that can place the first contact hole and the partition wall between the first sub-pixel area and the second sub-pixel area, while reducing the width between the first sub-pixel area and the second sub-pixel area. It is becoming.

In the organic light emitting display device 200 according to an embodiment of the present invention, an organic light emitting layer 280 is formed in the first contact hole 242 for electrically connecting the first auxiliary electrode 237 and the second auxiliary electrode 252. ) is inserted and placed to cut off the partition wall 270. Accordingly, the width for forming the first contact hole 242 and the width for disposing the partition wall 270 overlap each other, so that the width between the first sub-pixel area SP1 and the second sub-pixel area SP2 The width for forming the first contact hole 242 no longer needs to be provided. Accordingly, the first contact hole 242 and the partition wall 270 are disposed between the first sub-pixel area SP1 and the second sub-pixel area SP2, thereby forming the first sub-pixel area SP1 and the second sub-pixel area SP2. An increase in the width W2 between the regions SP2 is minimized, and a decrease in the aperture ratio of the organic light emitting display device 200 is also minimized.

Figure 3 is a schematic cross-sectional view of an organic light emitting display device according to another embodiment of the present invention.

The organic light emitting display device 300 of FIG. 3 is different from the organic light emitting display device 200 of FIG. 2 only in that the partition wall 370 includes a first partition wall 372 and a second partition wall 374. Since the remaining configuration is substantially the same, redundant description will be omitted.

Referring to FIG. 3 , the partition wall 370 includes a first partition wall 372 and a second partition wall 374 disposed on the first partition wall 372 .

The first barrier rib 372 is disposed to cover the second portion 256 of the second auxiliary electrode 252. The first barrier rib 372 may be disposed simultaneously with the bank layer 260 in the same process. Accordingly, the first partition 372 may be made of the same material as the bank layer 260 and may have the same level as the bank layer 260.

A second partition wall 374 is disposed on the first partition wall 372. The second partition 374 is arranged to cover the entire upper surface of the first partition 372.

A portion of the first partition wall 372 may have a positive taper shape. Specifically, as shown in FIG. 3 , the remaining portion of the first barrier rib 372 excluding the portion that fills the first contact hole 242 may have a positive taper shape. Unlike the first barrier rib 372, the second barrier rib 374 may have a reverse taper shape. The first partition wall 372 and the second partition wall 374 may be made of different materials such that the first partition wall 372 has a positive taper shape and the second partition wall 374 has a reverse taper shape. For example, the first barrier rib 372 may be made of a positive type photoresist to easily implement a positive taper shape, and the second barrier rib 374 may be made of a negative type photoresist to easily implement a reverse taper shape. It can be composed of:

In the organic light emitting display device 300 according to another embodiment of the present invention, the partition wall 370 inserted into the first contact hole 242 is composed of a first partition wall 372 and a second partition wall 374 that are different from each other. As a result, a portion of the partition wall 370 can more easily have a reverse taper shape.

Figure 4 is a schematic cross-sectional view of an organic light emitting display device according to another embodiment of the present invention.

Compared to the organic light emitting display device 200 of FIG. 2, the organic light emitting display device 400 of FIG. 4 does not cover the second portion 256 of the second auxiliary electrode 252 in that the partition wall 470 covers the second auxiliary electrode 252. arranged to cover a portion of the first portion 254 of the electrode 252, and the cathode 490 extends to the space between the partition wall 470 and the first portion 254 of the second auxiliary electrode 252. Since only the arranged configuration is different and the remaining configurations are substantially the same, redundant description will be omitted.

Referring to FIG. 4, in the organic light emitting display device 400 according to another embodiment of the present invention, the partition wall 470 is connected to the first portion 254 and the second portion 256 of the second auxiliary electrode 252. It is arranged to cover only a portion of the first portion 254. Specifically, the partition 470 does not cover the second portion 256 of the second auxiliary electrode 252 having the same level as the anode 250, and the second auxiliary electrode has a lower level than the second portion 256. It is arranged to cover only a portion of the first portion 254 of 252.

As the partition wall 470 is disposed to cover only a portion of the first part 254 of the second auxiliary electrode 252, there is a certain distance between the partition wall 470 and the first part 254 of the second auxiliary electrode 252. Space is secured. As shown in FIG. 4, the cathode 490 is located between the second portion 256 of the second auxiliary electrode 252 as well as the partition wall 270 and the first portion 254 of the second auxiliary electrode 252. It is arranged to extend into space. Accordingly, a larger electrically connected area between the cathode 290 and the second auxiliary electrode 252 can be secured.

In the organic light emitting display device 400 according to another embodiment of the present invention, the partition wall 470 is the first part 254 of the first part 254 and the second part 256 of the second auxiliary electrode 252. ), a larger contact area between the cathode 490 and the second auxiliary electrode 252 can be secured. Therefore, compared to other organic light emitting display devices that use a second auxiliary electrode of the same size, the voltage drop phenomenon at the cathode 490 can be compensated for more effectively.

Figure 5 is a schematic cross-sectional view of an organic light emitting display device according to another embodiment of the present invention.

The organic light emitting display device 500 of FIG. 5 is different from the organic light emitting display device 400 of FIG. 4 only in that the partition wall 570 includes a first partition wall 572 and a second partition wall 574. Since the remaining configuration is substantially the same, redundant description will be omitted.

Referring to FIG. 5 , the partition wall 570 includes a first partition wall 572 and a second partition wall 574 disposed on the first partition wall 572 .

The first partition 572 is disposed to cover only a portion of the first part 254 of the first part 254 and the second part 256 of the second auxiliary electrode 252. Accordingly, the cathode 590 extends not only to the second portion 256 of the second auxiliary electrode 252 but also to the space between the first partition 572 and the first portion 254 of the second auxiliary electrode 252. It is placed as follows. As shown in FIG. 5, the first partition wall 572 may have a positive taper shape. The first partition 572 may be disposed at the same time as the bank layer 260 in the same process, and accordingly, may be made of the same material as the bank layer 260 and may have the same level.

A second partition wall 574 is disposed on the first partition wall 572. The second partition 574 is arranged to cover the entire upper surface of the first partition 572. The second partition 574 may have a reverse taper shape.

In the organic light emitting display device 500 according to another embodiment of the present invention, the voltage drop phenomenon at the cathode 590 can be more effectively compensated, and a portion of the partition wall 570 can more easily have an inverse taper shape. It becomes possible.

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 below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100, 200, 300, 400, 500: Organic light emitting display device
SP1: first sub-pixel area
SP2: Second sub-pixel area
110, 210: substrate
120, 220: buffer layer
130, 230: thin film transistor
135, 235: Gate insulating layer
136: 236: interlayer insulating layer
137, 237: first auxiliary electrode
140, 240: Flattening layer
142, 242: first contact hole
144, 244: second contact hole
150, 250: anode
152, 252: second auxiliary electrode
160, 260: Bank layer
170, 270, 370, 470, 570: Bulkhead
180: Organic light-emitting layer
182, 282: Organic layer
190, 290, 490, 590: cathode
192, 292: conductive layer
231: Active layer
232: Gate electrode
233: source electrode
234: drain electrode
254: First part of the second auxiliary electrode
256: second portion of second auxiliary electrode
372, 572: first bulkhead
374, 574: second bulkhead

Claims (19)

A substrate having a first sub-pixel area and a second sub-pixel area on which a thin film transistor, an anode, an organic light emitting layer, and a cathode are respectively disposed;
a first auxiliary electrode disposed on the substrate between the first sub-pixel area and the second sub-pixel area;
a planarization layer disposed on the first auxiliary electrode and including a contact hole exposing a portion of an upper surface of the first auxiliary electrode;
a second auxiliary electrode disposed between the first sub-pixel area and the second sub-pixel area, spaced apart from the anode on the planarization layer, and electrically connected to the first auxiliary electrode through the contact hole;
a partition disposed on the second auxiliary electrode and inserted into the contact hole; and
It includes a pair of bank layers disposed on the planarization layer with the partition therebetween,
The organic light emitting layer is short-circuited (disconnected) between the first sub-pixel area and the second sub-pixel area,
An end of the short-circuited organic light-emitting layer is in contact with the second auxiliary electrode,
An organic light emitting display device, wherein the cathode surrounds an end of the organic light emitting layer and is electrically connected to the second auxiliary electrode. According to claim 1,
The organic light emitting display device wherein the first auxiliary electrode is made of the same material on the same layer as the source electrode and drain electrode of the thin film transistor. According to claim 1,
The organic light emitting display device wherein the second auxiliary electrode is on the same layer as the anode and is made of the same material. delete According to claim 1,
The barrier rib is disposed in a bar shape in a first direction between the first sub-pixel area and the second sub-pixel area. According to claim 1,
An organic light emitting display device, wherein the organic light emitting layer covers the bank layer and is cut off between the barrier wall and the bank layer by the barrier wall between the first sub-pixel region and the second sub-pixel region. According to claim 1,
The second auxiliary electrode includes a first part in contact with the contact hole, and a second part having a higher level than the first part. According to clause 7,
The second portion has the same level as the anode. According to clause 7,
The bank layer is arranged to cover the edge of the second auxiliary electrode,
The barrier rib is disposed to cover the second portion excluding an edge covered by the bank layer. According to clause 7,
The barrier rib is disposed to cover only a portion of the first portion among the first portion and the second portion. According to claim 10,
The cathode is disposed to extend into a space between the partition wall and the first portion. According to clause 9,
The organic light emitting display device wherein the barrier rib includes a first barrier rib and a second barrier rib disposed on the first barrier rib. According to claim 12,
The organic light emitting display device wherein the first barrier rib and the second barrier rib are made of different materials. According to claim 12,
The organic light emitting display device wherein the first barrier rib is made of the same material as the bank layer. According to claim 12,
The organic light emitting display device wherein the first barrier rib is made of a positive type photoresist, and the second barrier rib is made of a negative type photoresist. According to claim 12,
The organic light emitting diode display device wherein the first barrier rib has a positive taper shape and the second barrier rib has a reverse taper shape. According to claim 1,
The contact hole is disposed on the substrate in the form of a dot, a line, or a mesh. delete a substrate having a first sub-pixel area and a second sub-pixel area on which a thin film transistor, an anode, an organic light emitting layer, and a cathode are respectively disposed;
a first auxiliary electrode disposed on the substrate between the first sub-pixel area and the second sub-pixel area;
a planarization layer disposed on the first auxiliary electrode and including a contact hole exposing a portion of an upper surface of the first auxiliary electrode;
a second auxiliary electrode disposed on the planarization layer between the first sub-pixel area and the second sub-pixel area and electrically connected to the first auxiliary electrode through the contact hole;
a partition disposed on the second auxiliary electrode and inserted into the contact hole; and
It includes a pair of bank layers disposed on the planarization layer with the partition therebetween,
The organic light emitting layer is short-circuited (disconnected) between the first sub-pixel area and the second sub-pixel area,
The organic light emitting display device wherein the second auxiliary electrode is disposed on the same layer as the anode and spaced apart from the anode.