KR102411565B1 - Transparent organic light emitting display device and method of manufacturing the same - Google Patents

Abstract

A transparent organic light emitting display device is provided. A transparent organic light emitting diode display includes a light emitting area and a transmissive area. A transparent anode, an organic light emitting layer and a transparent cathode are disposed in the light emitting region. A transparent auxiliary electrode is disposed in the transmission region and is configured to transmit external light. The transparent auxiliary electrode is made of the same material as the transparent anode, and is disposed to be spaced apart from the transparent anode. The transparent cathode is characterized in that it extends into the transmissive region and is electrically connected to the transparent auxiliary electrode. A transparent auxiliary electrode having transparency and overlapping the transmissive region is disposed in the transmissive region of the transparent organic light emitting diode display according to an embodiment of the present invention. This is reduced, so that the luminance uniformity can be improved.

Description

Transparent organic light emitting display device and manufacturing method thereof

The present invention relates to a transparent organic light emitting display device and a method of manufacturing the same, and more particularly, to a transparent organic light emitting display in which the area of a transmission region is maximized by using a transparent auxiliary electrode and a method for manufacturing the same.

An organic light emitting display device is a self-emission type display device, and unlike a liquid crystal display device, it does not require a separate light source, so it can be manufactured in a lightweight and thin form. In addition, the organic light emitting diode display is being studied as a next-generation display because it is advantageous in terms of power consumption due to low voltage driving, and also has excellent response speed, viewing angle, and contrast ratio.

Since the organic light emitting display device can be easily reduced in thickness, it can be applied as a transparent display device capable of displaying an image while being transparent. The transparent organic light emitting diode display includes a light emitting area in which sub-pixels including an organic light emitting diode are disposed and a transparent area through which a background of the organic light emitting diode is transmitted. In order to improve the transmittance of the transparent organic light emitting diode display, the area of the transmittance region should be increased as much as possible. In particular, as the resolution of the transparent organic light emitting diode display increases, the number of sub-pixels increases. In this case, since the number of wirings for driving the sub-pixels also increases in proportion, it is difficult to secure the area of the transmission region. In particular, if the transmittance is too low, even if the background is transparent, it may appear too dark.

In the case of a top-emission type organic light emitting diode display, a transparent electrode or a translucent electrode is used as an upper electrode (ie, a cathode) to emit light emitted from the organic light emitting layer upward. A VSS voltage is applied to the cathode. At this time, the thickness of the cathode is formed to be thin in order to improve the transmittance of the cathode, and the decrease in the thickness of the cathode increases the wiring resistance of the cathode.

Also, in the case of an organic light emitting diode display having a large area, as the distance from the voltage supply pad part increases, the wiring resistance of the cathode increases in proportion to the distance. Accordingly, as the distance from the voltage supply pad part increases, a voltage drop phenomenon (or VSS rising phenomenon) may occur more severely, which may cause a problem of luminance non-uniformity in the organic light emitting diode display. As used herein, the voltage drop phenomenon refers to a phenomenon in which the potential difference formed in the organic light emitting device decreases, and specifically refers to a phenomenon in which the potential difference between the anode and the cathode of the organic light emitting device decreases.

In other words, since the distance between each sub-pixel and the voltage supply pad portion varies, the wiring resistance of the cathode of each sub-pixel varies. Accordingly, the degree of voltage drop of each sub-pixel varies depending on the cathode wiring resistance value, and as a result, the luminance non-uniformity problem of the organic light emitting diode display occurs.

To improve the voltage drop phenomenon, an auxiliary electrode may be used. The auxiliary electrode electrically connects the voltage supply pad part and the cathode, thereby lowering the wiring resistance between the voltage supply pad part and the cathode. However, in the transparent organic light emitting diode display, since the region in which the auxiliary electrode can be formed is relatively narrow, the auxiliary electrode has a limitation in lowering the wiring resistance of the cathode.

[Related technical literature]

1. Transparent organic light emitting display device and manufacturing method of transparent organic light emitting display device (Patent Application No. 2012-0155929)

The inventors of the present invention recognized that, in the case of a transparent organic light emitting diode display, it is difficult to arrange a general auxiliary electrode because the transmissive region must have transparency and transmittance sufficient to project the background of the transparent organic light emitting diode display. In addition, it was recognized that there is a limit to improving the voltage drop phenomenon since the space for forming the auxiliary electrode is narrow except for the transmission region. In particular, it was recognized that, since the conventional auxiliary electrode uses an opaque metal having low electrical resistance, when the area of the auxiliary electrode is increased, the transmittance of the transparent organic light emitting display device is reduced because the transmittance area is reduced. Accordingly, the present inventors have conducted various studies on an auxiliary electrode capable of effectively improving a voltage drop phenomenon while minimizing a decrease in transmittance of a transparent organic light emitting display device, and a transparent organic light emitting diode display including a transparent auxiliary electrode formed in a wide transmittance area. A light emitting display device and a method for manufacturing the same were invented.

Accordingly, the problem to be solved by the present invention is to form a transparent auxiliary electrode formed of a transparent conductive oxide in a wide transmissive area, thereby maximally maintaining transmittance while improving the voltage drop phenomenon, thereby improving the voltage uniformity of the transparent organic light emitting display device and method for manufacturing the same is to provide

Another object of the present invention is to provide a transparent organic light-emitting display device in which parasitic capacitance between an auxiliary electrode and lower wirings is minimized by forming an auxiliary electrode on a planarization layer, and a method of manufacturing the same.

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 following description.

In order to solve the above problems, a transparent organic light emitting display device according to an embodiment of the present invention includes a light emitting area and a transmissive area. A transparent anode, an organic light emitting layer and a transparent cathode are disposed in the light emitting region. A transparent auxiliary electrode is disposed in the transmission region and is configured to transmit external light. The transparent auxiliary electrode is made of the same material as the transparent anode, and is disposed to be spaced apart from the transparent anode. The transparent cathode is characterized in that it extends into the transmissive region and is electrically connected to the transparent auxiliary electrode. A transparent auxiliary electrode having transparency and overlapping the transmissive region is disposed in the transmissive region of the transparent organic light emitting diode display according to an embodiment of the present invention. This is reduced, so that the luminance uniformity can be improved.

According to another aspect of the present invention, the transparent organic light emitting display device is characterized in that the transparent anode, the transparent cathode, and the transparent auxiliary electrode are made of a transparent conductive oxide, and the transparent cathode is made of a material different from that of the transparent anode and the transparent auxiliary electrode.

According to another feature of the present invention, the transparent cathode is characterized in that it is composed of a material that is relatively less generated than the transparent anode and the transparent auxiliary electrode.

According to another feature of the present invention, the transparent organic light emitting display device further includes a transparent encapsulation layer including at least a first inorganic encapsulation layer, an organic material layer, and a second inorganic encapsulation layer, the transparent encapsulation layer being disposed on the transparent cathode, It is characterized in that it is disposed to cover the light emitting area and the transmissive area.

According to another aspect of the present invention, the transparent organic light emitting display device further includes a barrier rib disposed on the transparent auxiliary electrode, the organic light emitting layer is disposed to cover the transmissive region, and the transparent cathode has a higher step coverage than the organic light emitting layer. It is composed of a material and is characterized in that it is electrically connected to the transparent auxiliary electrode.

According to another feature of the present invention, the transparent organic light emitting display device further includes a transparent auxiliary electrode, an insulating layer disposed under the transparent anode, and a lower transparent auxiliary electrode disposed under the insulating layer, wherein the lower transparent auxiliary electrode is insulated It is characterized in that it is electrically connected to the transparent auxiliary electrode through a contact hole located in the layer, and the area of the lower transparent auxiliary electrode is larger than that of the transparent auxiliary electrode.

According to another feature of the present invention, the lower transparent auxiliary electrode overlaps the transparent anode, and the lower transparent auxiliary electrode is electrically insulated from the transparent anode by an insulating layer.

According to another feature of the present invention, the transparent auxiliary electrode is configured to completely cover the transmission region.

According to another feature of the present invention, the transparent organic light emitting display device further includes a transparent auxiliary electrode, an insulating layer disposed under the transparent anode, and an opaque auxiliary electrode disposed on the insulating layer and electrically connected to the transparent auxiliary electrode, , the opaque auxiliary electrode is disposed between the light emitting area and an adjacent light emitting area adjacent to the light emitting area.

According to another feature of the present invention, the transparent organic light emitting display device further includes a data line, and the data line and the opaque auxiliary electrode are vertically crossed.

In order to solve the above problems, a transparent organic light emitting display device according to another exemplary embodiment includes a light emitting area and a transmissive area. A reflective layer, a transparent anode, an organic light emitting layer and a transparent cathode are disposed in the light emitting region. A transparent auxiliary electrode is disposed in the transmission region and is configured to transmit external light. Light emitted from the organic light emitting layer is reflected by the reflective layer and transmitted through the transparent cathode. The transparent cathode is disposed to cover the light emitting region and the transmissive region and is characterized in that it is electrically connected to the transparent auxiliary electrode. In a transparent organic light emitting display device according to another embodiment of the present invention, the transparent cathode is disposed to cover both the light emitting area and the transmittance area and at the same time is electrically connected to the transparent auxiliary electrode, so that transmittance can be improved, and the overall cathode wiring resistance can be significantly lowered.

According to another aspect of the present invention, the transparent organic light emitting display device further includes a translucent cathode made of a metallic material and disposed between the light emitting area and the adjacent light emitting area, wherein the work function of the translucent cathode is smaller than the work function of the transparent cathode. characterized.

According to another feature of the present invention, the translucent cathode has a first thickness and a second thickness, the first thickness is less than the second thickness, the light emitting area having a translucent cathode of the first thickness disposed between adjacent light emitting areas It is characterized in that the second thickness of the translucent cathode is disposed.

According to another feature of the present invention, the second thickness is twice the first thickness, the transmittance of the first thick region is higher than the transmittance of the second thick region, and the resistance of the second thick region is higher than the resistance of the first thick region. characterized by low.

According to another feature of the present invention, the translucent cathode is disposed between the organic light emitting layer and the transparent cathode.

According to another feature of the present invention, the translucent cathode and the transparent auxiliary electrode are arranged parallel to each other, and the translucent cathode is arranged to completely cover the light emitting area.

According to another feature of the present invention, the translucent cathode and the transparent auxiliary electrode are spaced apart from each other and electrically connected to each other by the transparent cathode.

In order to solve the above problems, in the method of manufacturing a transparent organic light emitting display device according to an embodiment of the present invention, a transparent anode is formed on a substrate of a light emitting area, and the transparent anode is formed on a substrate of a transmission area configured to transmit external light. A transparent anode comprising: forming a transparent auxiliary electrode to be spaced apart from the anode; forming an organic light emitting layer on the transparent anode; The organic light emitting layer and the transparent cathode are formed in the light emitting region, and the transparent auxiliary electrode is characterized in that it is composed of the same material as the transparent anode. In the method of manufacturing a transparent organic light emitting display device according to an embodiment of the present invention, since the transparent auxiliary electrode having transparency is formed to overlap the transmissive region, the area of the transmissive region can be maximized and the overall resistance of the transparent cathode can be lowered. have. In addition, since the transparent auxiliary electrode can be formed simultaneously with the transparent anode, an additional process for forming the transparent auxiliary electrode is not required, and the manufacturing process of the transparent organic light emitting diode display can be simplified.

According to another feature of the present invention, the transparent cathode, the transparent anode and the transparent auxiliary electrode are formed by a sputtering process.

According to another feature of the present invention, the forming of the transparent anode and the transparent auxiliary electrode includes: forming a reflective layer in the light emitting region, forming a transparent conductive oxide layer to cover the reflective layer, and patterning the transparent conductive oxide layer thereby, forming a transparent auxiliary electrode and a transparent anode separated from the transparent auxiliary electrode and disposed on the reflective layer.

According to another feature of the present invention, the forming of the reflective layer includes forming an opaque auxiliary electrode between the light emitting region and an adjacent light emitting region adjacent to the light emitting region in the same plane as the reflective layer.

According to another feature of the present invention, the step of forming the transparent cathode further includes the step of forming a translucent cathode in contact with the transparent cathode, the transparent cathode being formed in common in the transmissive region and the light emitting region, the translucent cathode is It is composed of a metallic material and is characterized in that it is formed only in the light emitting area.

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

According to the present invention, a decrease in transmittance of a transparent organic light emitting display device is minimized by forming an auxiliary electrode of a transparent conductive oxide.

The present invention has the effect of minimizing the voltage drop phenomenon by reducing the wiring resistance of the transparent cathode by forming the transparent auxiliary electrode in the transmissive area wider than the light emitting area.

The present invention has an effect of minimizing parasitic capacitance that may be generated between the transparent auxiliary electrode and lower wirings disposed under the planarization layer by forming the transparent auxiliary electrode on the planarization layer.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a schematic plan view illustrating a transparent organic light emitting display device according to an exemplary embodiment.
FIG. 2 is a cross-sectional view of IIa-IIa' and IIb-IIb' of FIG. 1 .
3 is a cross-sectional view of IIa-IIa' and IIb-IIb' of FIG. 1 according to another embodiment of the present invention.
4 is a cross-sectional view of IIa-IIa' and IIb-IIb' of FIG. 1 according to another embodiment of the present invention.
5A and 5B are cross-sectional views taken along line V-V′ of FIG. 1 according to another embodiment of the present invention.
6 is a schematic cross-sectional view illustrating a transparent organic light emitting display device according to another exemplary embodiment.
7A and 7B are schematic plan views illustrating a transparent organic light emitting diode display according to another exemplary embodiment.
8 is a flowchart illustrating a method of manufacturing a transparent organic light emitting display device according to an exemplary embodiment.
9A to 9F are schematic cross-sectional views illustrating a method of manufacturing a transparent organic light emitting display device according to an exemplary embodiment.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of 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 the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', 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 case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

Reference to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of the other device or layer.

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

Like reference numerals refer to like elements throughout.

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

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or implemented together in a related relationship. may be

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

1 is a schematic plan view illustrating a transparent organic light emitting display device according to an exemplary embodiment. FIG. 2 is a cross-sectional view of IIa-IIa' and IIb-IIb' of FIG. 1 . 1 and 2 , the transparent organic light emitting diode display 100 includes a substrate 101 , an organic light emitting device, and a transparent auxiliary electrode 150 . For convenience of explanation, two sub-pixels are schematically illustrated in FIG. 1 , and each sub-pixel is configured in a 2T1C structure including two thin film transistors and one capacitor. However, the structure of the sub-pixel is not limited to the 2T1C structure, and each sub-pixel may be formed in various ways, such as a 3T1C structure including three thin film transistors and one capacitor or a 4T2C structure including four thin film transistors and two capacitors. It may be configured to include additional compensation structures. Meanwhile, in FIG. 1 , the reflective layer 141 , the organic light emitting layer 143 , and the transparent cathode 144 of the organic light emitting diode are omitted, respectively, and the thickness and shape of each wiring is schematically illustrated.

The transparent organic light emitting display device 100 according to an exemplary embodiment is a top emission type organic light emitting display device in which light emitted from the organic light emitting layer 143 is emitted toward the top surface of the substrate 101 . The top emission transparent organic light emitting display device 100 includes a reflective layer 141 disposed under a transparent anode 142 , and light emitted from the organic light emitting layer 143 includes a transparent cathode 144 that transmits light. emitted through

In this specification, the transmittance of a specific component means transmittance with respect to a visible light wavelength band. In this specification, the transmittance of a specific component is defined as a ratio of the amount of light transmitted through the specific component to the amount of light incident toward the specific component.

In the present specification, transparency refers to a characteristic in which an image of a background transmitted through a transparent organic light emitting diode display is transparent.

In order to improve transparency, distortion of the transmitted background should be minimized. For example, the surface of the substrate may be formed to be flat. If the surface of the substrate is not flat, transparency may be deteriorated due to refraction, scattering, reflection, etc. of transmitted light. Each of the layers having transparency disposed in the transmissive region may also be formed flat.

In the present specification, the visible light transmittance of the transparent components, for example, the transparent cathode, the transparent auxiliary electrode, the lower transparent auxiliary electrode, and the transparent conductive oxide layer may be 80% or more.

In the present specification, the components having translucency, for example, the translucent cathode may have a visible light transmittance of 30% to less than 80%.

However, transparency and translucency are not limited to these numerical values, and should be interpreted in consideration of the purpose and function of each component to be substantially disclosed in the present specification.

Referring to FIG. 1 , a substrate 101 is a substrate for supporting various components of the transparent organic light emitting display device 100 , and may be a glass substrate or a transparent plastic substrate having excellent transmittance. In addition, the substrate is configured to have excellent transparency (transparent characteristics). The substrate 101 includes a plurality of emission areas D/A1 and D/A2 , a plurality of transmission areas T/A1 and T/A2 , and a non-display area N/A. 1 shows two light emitting areas D/A1 and D/A2 and two transmissive areas T/A1 and T/A2. The light-emitting areas D/A1 and D/A2 are areas in which organic light-emitting devices are disposed, and mean areas in which an image is displayed, and may also be referred to as a pixel area or a sub-pixel. The transmissive area T/A1 T/A2 means an area through which an image is not displayed and a lower background of the substrate 101 is transmitted, and may be referred to as a transparent window. Since external light is transmitted in the transmission areas T/A1 and T/A2 , the transparent organic light emitting diode display 100 may have transparency. The non-display area N/A means an area other than the emission areas D/A1 and D/A2 and the transmission areas T/A1 and T/A2. In particular, the transmissive areas T/A1 and T/A2 may be configured to have transparency so that the background is projected through the transparent organic light emitting diode display 100 .

The data line 110 and the gate line 120 are disposed to cross each other on the substrate 101 . Light-emitting areas D/A1 and D/A2 and transmission areas T/A1 and T/A2 may be included in regions defined by crossing the data line 110 and the gate line 120 , respectively. However, the present invention is not limited thereto. Although FIG. 1 shows the data line 110 and the gate line 120 having a straight shape, the shape of the gate line 120 and the data line 110 may be an oblique line, a curved line, or a zigzag shape. However, the present invention is not limited thereto.

The first thin film transistor TFT1 and the second thin film transistor TFT2 each include a gate electrode, a source electrode, and a drain electrode, and may be a P-type thin film transistor or an N-type thin film transistor. 1 and 2 illustrate a P-type thin film transistor for convenience of description. In addition, the first thin film transistor TFT1 and the second thin film transistor TFT2 each have a coplanar structure in which a gate electrode is disposed on an active layer or an inverted staggered structure in which a gate electrode is disposed under the active layer. inverted-staggered) structure. For convenience of explanation, a thin film transistor having a coplanar structure is illustrated in FIGS. 1 and 2 . However, the thin film transistor included in the transparent organic light emitting diode display 100 according to the exemplary embodiment is not limited to the P-type thin film transistor, and the structure of the thin film transistor is not limited to the coplanar structure.

A gate electrode of the first thin film transistor TFT1 is connected to the gate line 120 , a source electrode is connected to the data line 110 , and a drain electrode of the first thin film transistor TFT1 is made of the same metal as the storage capacitor Cst. It is connected to one electrode and a gate electrode of the second thin film transistor TFT2. The first thin film transistor TFT1 may be referred to as a switching transistor. A source electrode of the second thin film transistor TFT2 is connected to the other electrode of the storage capacitor Cst formed of the same metal as the VDD line 130 and the data line 110 , and a drain electrode of the first thin film transistor TFT1 is connected to the second thin film transistor TFT2 . and the transparent anode 142 of the organic light emitting device. The second thin film transistor TFT2 may be referred to as a driving transistor.

The VDD wiring 130 provides a VDD voltage to the organic light emitting diode.

The first thin film transistor TFT1 , the second thin film transistor TFT2 , the storage capacitor Cst, the data line 110 , the gate line 120 , and the VDD line 130 are all transparent regions T/A1 , T/ It is not placed in A2). For example, the first thin film transistor TFT1 , the second thin film transistor TFT2 , and the storage capacitor Cst are disposed in the emission areas D/A1 and D/A2 , and the transmission areas T/A1 and T/ It does not overlap with A2). The data line 110 and the gate line 120 are disposed in the non-display area N/A and are not disposed in the transparent areas T/A1 and T/A2 . In addition, the VDD wiring 130 extends to pass through the light emitting areas D/A1 and D/A2 and does not pass through the transmissive areas T/A1 and T/A2. That is, only transparent layers having excellent visible light transmittance are disposed in the transmission areas T/A1 and T/A2. Accordingly, the transmission regions T/A1 and T/A2 may achieve excellent transmittance of visible light. In addition, since the transmission areas T/A1 and T/A2 are disposed on the planarization layer 161 , excellent transparency with low distortion may be obtained.

Referring to FIG. 2 , the planarization layer 161 is disposed to cover the first thin film transistor TFT1 , the second thin film transistor TFT2 , the storage capacitor Cst, and the VDD wiring 130 . The planarization layer 161 planarizes the upper surface of the substrate 101 and may be formed of a transparent organic insulating material. The planarization layer 161 is thick enough to planarize the step difference caused by the first thin film transistor TFT1 , the second thin film transistor TFT2 , and the storage capacitor Cst.

A reflective layer 141 electrically connected to the second thin film transistor TFT2 is disposed on the planarization layer 161 . For example, the reflective layer 141 is disposed separately in each of the light emitting areas D/A1 and D/A2. The reflective layer 141 reflects light emitted from the organic light emitting layer 143 upward. The reflective layer 141 may be formed of silver (Ag), nickel (Ni), gold (Au), platinum (Pt), aluminum (Al), copper (Cu), molybdenum/aluminum neodium (Mo/AlNd) having excellent reflectance. can

A transparent anode 142 is disposed on the reflective layer 141 . For example, the transparent anode 142 is separated and disposed in each of the light emitting areas D/A1 and D/A2 in the same manner as the reflective layer 141 . The transparent anode 142 provides holes to the organic light emitting layer 143 . The transparent anode 142 includes indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (Zinc Oxide), and tin oxide (Tin Oxide) to easily provide holes. It may be formed of a transparent conductive oxide (TCO) having a high work function. Although, in this specification, the reflective layer 141 and the transparent anode 142 have been separately described, the transparent anode 142 and the reflective layer 141 are not distinguished, and they may be referred to as a single transparent anode or a reflective anode. .

The transparent auxiliary electrode 150 is separated from the transparent anode 142 and is disposed in the transmission areas T/A1 and T/A2. The transparent auxiliary electrode 150 covers the plurality of transmission areas T/A1 and T/A2 . For example, as shown in FIG. 1 , the transparent auxiliary electrode 150 includes a first transmission area T/A1 , a second transmission area T/A2 , and a first transmission area T/A1 and a second transmission area T/A1 . It may extend to cover the non-display area N/A between the two transmission areas T/A2 . Accordingly, when the transparent auxiliary electrode 150 is disposed to cover the non-display area N/A, a level of wiring resistance similar to that of a conventional auxiliary electrode is achieved and at the same time, a transmission area of the transparent organic light emitting diode display 100 is achieved. A decrease in the aperture ratio of (T/A1, T/A2) can be minimized.

According to this configuration, the transparent auxiliary electrode 150 may extend in one direction and may be connected to the voltage supply pad unit in the outer region of the transparent organic light emitting diode display 100 . Accordingly, the VSS voltage may be transmitted from the voltage supply pad unit through the transparent auxiliary electrode 150 . The transparent auxiliary electrode 150 may have a preset width (W). For example, the transparent auxiliary electrode 150 may have the same width as the widths of the first transmissive area T/A1 and the second transmissive area T/A2 .

As shown in FIG. 2 , the transparent auxiliary electrode 150 is disposed on the planarization layer 161 . As described above, since the planarization layer 161 has a thick thickness, parasitic capacitance that may be generated between the transparent auxiliary electrode 150 and the lower wiring may be reduced. In addition, transparency of the transmission region may be improved by planarization. For example, as shown in FIG. 2 , the gate wiring 120 may be disposed under the transparent auxiliary electrode 150 , but a thick planarization layer 161 between the gate wiring 120 and the transparent auxiliary electrode 150 . ), a parasitic capacitance that may be generated between the transparent auxiliary electrode 150 and the gate wiring 120 may be minimized.

The transparent auxiliary electrode 150 is electrically connected to the transparent cathode 144 . For example, as shown in FIG. 1 , the transparent auxiliary electrode 150 is electrically connected to the transparent cathode 144 in the contact area C/A existing in the non-display area N/A. Accordingly, the transparent auxiliary electrode 150 serves to alleviate the voltage drop caused by the high wiring resistance of the transparent cathode 144 .

In addition, the transparent auxiliary electrode 150 may be made of the same material as the transparent anode 142 . For example, the transparent auxiliary electrode 150 may be formed of a transparent conductive oxide having excellent transmittance, such as ITO, IZO, ITZO, zinc oxide, and tin oxide.

The bank 162 is disposed on the transparent anode 142 and the transparent auxiliary electrode 150 , the light emitting areas D/A1 and D/A2 , the transparent areas T/A1 and T/A2 , and the contact area C /A) has an opening corresponding to it. That is, as shown in FIG. 2 , the bank 162 surrounds the periphery of the transparent anode 142 , and the upper surface of the transparent anode 142 is exposed in the light emitting areas D/A1 and D/A2 .

As described above, since the bank 162 has openings corresponding to the transmissive regions T/A1 and T/A2 , the upper surface of the transparent auxiliary electrode 150 is formed in the transmissive regions T/A1 and T/A2 . exposed However, the present invention is not limited thereto, and the bank 162 may be configured to cover the transmission areas T/A1 and T/A2.

The bank 162 divides adjacent sub-pixel areas and serves to separate the light-emitting area D/A and the transmissive area T/A in the same sub-pixel area. The bank 162 is made of any one of a transparent organic insulating material, for example, polyimide, photo acryl, or benzocyclobutene (BCB), or a black material, for example, black. It may be made of resin.

In the bank 162 , a portion of the upper surface of the transparent auxiliary electrode 150 is exposed through the opening corresponding to the contact area C/A. Although the shape of the contact area C/A is illustrated as a quadrangle in FIG. 1 , the contact area C/A may have a polygonal, circular, or oval shape other than a quadrangle, and the shape is not particularly limited.

The bank 162 may be formed of an organic insulator, and the bank 162 may have a tapered shape. Referring back to FIG. 2 , the tapered shape refers to a shape in which the width of the bank 162 decreases as it gradually moves upward from the substrate 101 with respect to the substrate 101 . When the bank 162 has a tapered shape, the bank 162 is made of photoresist. The bank 162 separates the adjacent first light-emitting area D/A1 and the second light-emitting area D/A2 from each other, and the adjacent first light-emitting area D/A1 and the first transmissive area T/ A1) has a thickness that can be distinguished from each other.

Referring to FIG. 2 , the barrier rib 170 is disposed in the contact area C/A. The partition wall 170 is formed in a reverse tapered shape. The reverse taper shape refers to a shape in which the width of the barrier rib 170 increases as it moves upward from the substrate 101 . The barrier rib 170 is disposed in the opening of the bank 162 disposed in the non-display area N/A. Such an opening may be referred to as a contact (C/A) region. The lower surface of the barrier rib 170 is in contact with a partial region of the transparent auxiliary electrode 150 , and the area of the upper surface of the barrier rib 170 is larger than the area of the lower surface of the barrier rib 170 . Accordingly, a shade due to the reverse taper shape of the partition wall 170 is generated in the lower portion of the partition wall 170 .

The partition wall 170 is thicker than the bank 162 . For example, the barrier rib 170 may have a thickness of about 1 μm to about 2.5 μm. When the partition wall 170 is thicker than the bank 162 , it may be easier to form the partition wall 170 in a reverse tapered shape. In some embodiments, the partition wall 170 may be disposed on the bank 162 . In this case, an island-shaped bank 162 may be additionally disposed at the center of the contact area C/A, and the partition wall 170 may be disposed on the island-shaped bank 162 .

The organic emission layer 143 is disposed in the emission areas D/A1 and D/A2 , the transmission areas T/A1 and T/A2 , and the non-display area N/A. For example, the organic emission layer 143 is disposed on the transparent anode 142 exposed in the emission areas D/A1 and D/A2. The organic light emitting layer 143 emits red, green, blue or white light based on the holes transmitted from the transparent anode 142 and the electrons transmitted from the transparent cathode 144 in the light emitting regions D/A1 and D/A2. glow In addition, since the organic emission layer 143 is transparent in a non-emission state, the organic emission layer 143 is disposed on the transparent auxiliary electrode 150 in the transmission regions T/A1 and T/A2 . In this case, a decrease in transmittance due to the organic emission layer 143 may not substantially occur.

The organic emission layer 143 is disposed on the bank 162 in the non-display area N/A, and covers some side surfaces of the bank 162 and the top surface of the barrier rib 170 in the contact area C/A. That is, the organic emission layer 143 may not cover a portion of the upper surface of the transparent auxiliary electrode 150 exposed between the side surface of the barrier rib 170 and the side surface of the bank 162 . Accordingly, a physical space for contact between the transparent cathode 144 and the transparent auxiliary electrode 150 may be secured between the side surface of the bank 162 and the side surface of the barrier rib 170 . The organic light emitting layer 144 is formed by depositing an organic light emitting material to cover all of the light emitting areas D/A1 and D/A2, the transmissive areas T/A1 and T/A2, and the non-display area N/A. can be formed. In general, the organic light emitting material is composed of a material having a low step coverage. Due to the step coverage of the organic light emitting material, the organic light emitting material is not deposited on the shadow portion generated by the reverse tapered shape of the barrier rib 170 and the side surface of the barrier rib 170 , and An organic light emitting material is deposited on the upper surface. Accordingly, a physical space in which the transparent auxiliary electrode 150 and the transparent cathode 144 can be electrically connected can be secured between the side surface of the partition wall 170 and the side surface of the bank 162 . That is, the organic light emitting layer 143 may be cut off by the barrier rib 170 . However, a structure for securing a physical space for contact between the transparent cathode 144 and the transparent auxiliary electrode 150 is not limited thereto.

The transparent cathode 144 is disposed on the organic light emitting layer 143 . For example, the transparent cathode 144 is disposed to cover the emission areas D/A1 and D/A2 , the transmission areas T/A1 and T/A2 , and the non-display area N/A. In this case, the transparent cathode 144 may be connected to the transparent auxiliary electrode 150 to alleviate a voltage drop phenomenon in the light emitting regions D/A1 and D/A2 .

The transparent cathode 144 is made of a transparent conductive oxide. For example, the transparent cathode 144 may be made of a transparent conductive oxide such as ITO, IZO, ITZO, zinc oxide and tin oxide, and may be made of the same transparent conductive oxide as the transparent anode 142 and the transparent auxiliary electrode 150 . can Since the transparent cathode 144 needs to supply electrons to the organic light emitting layer 143 , it is necessary to have high electrical conductivity and low work function. However, since the transparent cathode 144 made of a transparent conductive oxide has a high work function, it may be difficult to easily supply electrons to the organic light emitting layer 143 . To solve this problem, a metal doping layer is disposed between the transparent cathode 144 and the organic emission layer 143 . The metal doped layer allows electrons provided from the transparent cathode 144 to be easily injected into the organic light emitting layer 143 . The metal doping layer is doped with a metal dopant, and the metal dopant is selected from an aluminum-based metal including aluminum or aluminum neodium, an alkali metal such as lithium (Li), or an alkaline earth metal such as magnesium (Mg), or a mixture thereof. may include any one of the In order to prevent a decrease in transmittance in the transmissive regions T/A1 and T/A2, the metal doped layer may be disposed only in the light emitting regions D/A1 and D/A2. A transparent organic light emitting diode display further including a separate cathode made of a metallic material such as a metal doped layer will be described below with reference to FIGS. 3 and 4 .

In addition, an electron injection layer (EIL) is further disposed between the transparent cathode 144 and the organic light emitting layer 143 so that electrons are smoothly injected from the transparent cathode 144 into the organic light emitting layer 143 . It is also possible

In addition, the transparent cathode 144 may be made of a material different from that of the transparent anode 142 and the transparent auxiliary electrode 150 . Specifically, the transparent cathode 144 may be made of a material that relatively less generates foreign matter than the transparent anode 142 and the transparent auxiliary electrode 150 . For example, when the transparent anode 142 and the transparent auxiliary electrode 150 are made of ITO, the transparent cathode 144 may be made of IZO in which foreign matter is relatively less generated during the manufacturing process than ITO.

As the transparent cathode 144 is made of a material that generates relatively less foreign matter than the transparent anode 142 and the transparent auxiliary electrode 150, less foreign matter is generated in the transparent cathode 144, and the transparent cathode 144 is on the transparent cathode 144. In the process of forming the transparent encapsulation layer disposed on the transparent cathode 144 , the influence of foreign substances may be minimized. The transparent encapsulation layer functions to protect the organic light emitting device from oxygen and moisture. In particular, when a crack occurs in the transparent encapsulation layer, a defect may occur because a moisture permeation path is formed. Specifically, when a small amount of foreign matter is generated in the transparent cathode 144 , the possibility of cracking of the transparent encapsulation layer due to the foreign material after the transparent encapsulation layer is deposited on the transparent cathode 144 is reduced. Accordingly, defects of the transparent encapsulation layer may be minimized, and thus a yield may be increased during mass production. Here, the transparent encapsulation layer includes at least a first inorganic encapsulation layer, an organic material layer, and a second inorganic encapsulation layer, and is disposed on the transparent cathode 144 to cover the light emitting region and the transmissive region. Here, the first inorganic encapsulation layer and the second inorganic encapsulation layer are configured to encapsulate the organic material layer in the outer region.

In particular, if the above-described transparent encapsulation layer is applied, it is also possible to implement a flexible function.

The transparent cathode 144 may be in direct contact with the upper surface of the transparent auxiliary electrode 150 exposed between the side surface of the barrier rib 170 and the side surface of the bank 162 in the contact area C/A. Since the transparent conductive oxide constituting the transparent cathode 144 has a high step coverage, the transparent cathode 144 is formed from the top surface of the bank 162 to the side surface of the bank 162 , the side surface of the barrier rib 170 and the barrier rib 170 . It may be formed so as to continue along the upper surface of the. Accordingly, the transparent cathode 144 may be in contact with the transparent auxiliary electrode 150 exposed between the side surface of the barrier rib 170 and the side surface of the bank 162 , and thus the transparent cathode 144 and the transparent auxiliary electrode 150 . ) are electrically connected to each other. In order to stably connect the transparent cathode 144 and the transparent auxiliary electrode 150 to each other, the transparent cathode 144 is preferably formed to have a sufficient thickness. For example, the transparent cathode 144 may be formed to a thickness of about 1000 Å or more.

Although FIG. 2 shows the substrate 101 so that the organic emission layer 143 covers all of the emission areas D/A1 and D/A2, the transmission areas T/A1 and T/A2, and the non-display area N/A. ) has been described based on an example disposed on the front surface, but the organic light emitting layer 143 may be disposed only on the transparent anode 142 of the light emitting areas D/A1 and D/A2, and may be disposed on the non-display area N/A. In addition, the organic emission layer 143 may not be disposed in the transmission areas T/A1 and T/A2 . A fine metal mask (FMM) or a shadow mask may be used to form the organic light emitting layer 143 only in the light emitting areas D/A1 and D/A2, and specifically, the light emitting areas D/A1 and D The organic emission layer 143 may be formed using an FMM having an opening corresponding to /A2). In this case, the upper surface of the transparent auxiliary electrode 150 may be exposed without the barrier rib 170 , and the transparent cathode 144 and the transparent auxiliary electrode 150 may be electrically connected to each other without the barrier rib 170 .

As described above, since the transparent auxiliary electrode 150 is electrically connected to the transparent cathode 144 , the wiring resistance between the voltage supply pad part and the transparent cathode 144 may be reduced. That is, since the transparent cathode 144 is formed of a transparent conductive oxide, resistivity is relatively higher than that of a general metal wiring material. In addition, since the transparent auxiliary electrode 150 is electrically connected to the transparent cathode 144 , the overall wiring resistance between the voltage supply pad part and the transparent cathode 144 may be reduced. Accordingly, a voltage drop phenomenon due to the resistance of the transparent cathode 144 may be improved, and the luminance uniformity of the transparent organic light emitting display device 100 may be improved.

In addition, since the transparent auxiliary electrode 150 is made of a transparent conductive oxide, it may be disposed to cover all of the transmission areas T/A1 and T/A2 , and the transmittance of the transparent organic light emitting display device 100 is substantially substantially less. does not degrade

In general, opaque metals such as silver and copper have a relatively low resistivity compared to a transparent conductive oxide, but have a disadvantage in that they have high reflectance. For example, when a metal auxiliary electrode having a width of 10 μm and a thickness of 1000 Å is formed using a silver alloy, when the unit length is converted into the length of one sub-pixel, the unit It has a resistance of 25.2Ω per length, and the total resistance of the transparent cathode 144 connected to the metal auxiliary electrode may be lowered. However, since the auxiliary metal electrode is opaque, as the width of the auxiliary metal electrode increases by 10 μm, the transmittance of the transparent organic light emitting diode display 100 may decrease by, for example, 3 to 4%. In more detail, the transmittance of the transparent organic light emitting diode display 100 is determined by considering not only the visible ray transmittance of the transmissive region, but simultaneously considering the aperture ratio of the transmissive region and the complex visible ray transmittance of materials disposed in the transmissive region. is decided Accordingly, there is a limit to improving the voltage drop phenomenon of the transparent organic light emitting display device 100 while preventing a decrease in transmittance by using the metal auxiliary electrode. On the other hand, although the resistivity of the transparent auxiliary electrode 150 is relatively high compared to that of the metal, as shown in FIG. 1 , it may be disposed to cover all of the transmission regions T/A1 and T/A2, A decrease in transmittance also hardly occurs. Accordingly, when the transparent auxiliary electrode 150 is formed in a wide area, that is, when the wiring width of the transparent auxiliary electrode 150 is considerably widened, the wiring resistance of the transparent auxiliary electrode 150 may be sufficiently low. For example, when the transparent auxiliary electrode 150 is formed of IZO, the width W of the transparent auxiliary electrode 150 is 550 μm and the thickness is 1000 Å, the transparent of the first transmission region T/A1 is The wiring resistance of the auxiliary electrode 150 may be 30Ω per unit length. That is, the wiring resistance of the transparent auxiliary electrode 150 is at a level similar to that of the metal auxiliary electrode. Therefore, when the transparent auxiliary electrode 150 is used, since the transmission area can be formed widely, the aperture ratio of the transmission area can be increased compared to the general auxiliary electrode. Accordingly, the transmittance is increased.

Meanwhile, the transparent auxiliary electrode 150 is disposed on the planarization layer 161 to cover the transmission areas T/A1 and T/A2 . Accordingly, a parasitic capacitance that may be generated between the transparent auxiliary electrode 150 and the lower wirings may be effectively reduced.

3 is a cross-sectional view of IIa-IIa' and IIb-IIb' of FIG. 1 according to another embodiment of the present invention. The transparent organic light emitting diode display 300 shown in FIG. 3 is shown in FIGS. 1 and 2 except that it further includes a translucent cathode 345 disposed on the transparent cathode 144 in the emission area D/A1. Since it is substantially the same as the illustrated transparent organic light emitting diode display 100 , a redundant description thereof will be omitted.

Referring to FIG. 3 , the translucent cathode 345 is disposed on the transparent cathode 144 to contact the transparent cathode 144 only in the light emitting area D/A1 . Here, the translucent cathode 345 serves to apply a voltage to the organic light emitting layer 143 together with the transparent cathode 144 . In addition, the translucent cathode 345 serves to compensate for a voltage drop at the cathode that may occur when the cathode is configured with only the transparent cathode 144 , which is a transparent electrode.

The translucent cathode 345 is made of a metallic material having a very thin thickness and a low work function. Examples of the metal that can be used as the translucent cathode 345 include silver (Ag), titanium (Ti), aluminum (Al), molybdenum (Mo), or an alloy of silver (Ag) and magnesium (Mg). have.

As described above, since the translucent cathode 345 is made of a metallic material, the transmittance for light is lower than that of the transparent cathode 144 , and the transparency of the translucent cathode 345 is also lower than that of the transparent cathode 144 . Accordingly, even if the translucent cathode 345, which is a metallic material, is formed with a thin thickness, a transmittance of not high level, for example, a transmittance of about 55%, is inevitably secured. It is disposed only in D/A1 , and the translucent cathode 345 is not disposed in the transmission areas T/A1 and T/A2 in order to secure transmittance in the transmission areas T/A1 and T/A2 .

In the transparent organic light emitting diode display 300 according to another embodiment of the present invention, a translucent cathode 345 made of a metallic material is disposed on the transparent cathode 144 having high transmittance but high resistivity. As the translucent cathode 345 is disposed on the transparent cathode 144, the wiring resistance of the transparent cathode 144 can be effectively reduced, and accordingly, the voltage drop by the transparent cathode 144 and the translucent cathode 345 is can be effectively supplemented.

In addition, since the translucent cathode 345 has a transmittance lower than that of the transparent cathode 144 , the translucent cathode 345 is disposed only in the light emitting area D/A1, so that the transmissive area T/ A voltage drop due to the transparent cathode 144 and the translucent cathode 345 can be effectively reduced while maximally securing the transmittance at A1 and T/A2 .

At this time, since the translucent cathode 345 is not disposed in the transmissive region, excellent transparency is not required.

4 is a cross-sectional view of IIa-IIa' and IIb-IIb' of FIG. 1 according to another embodiment of the present invention. The transparent organic light emitting diode display 400 shown in FIG. 4 has the transparent organic light emitting diode display shown in FIG. 3 except for the configuration in which the transparent cathode 444 is disposed on the translucent cathode 445 in the emission area D/A1. Since it is substantially the same as the display device 300 , a redundant description thereof will be omitted.

Referring to FIG. 4 , a transparent cathode 444 is disposed on the translucent cathode 445 to be in contact with the translucent cathode 445 . The transparent cathode 444 also serves to apply a voltage to the organic emission layer 143 . The transparent cathode 444 may be formed of a transparent conductive material, for example, indium zinc oxide (IZO). Here, the transparent cathode 444 having transmittance may mean that the transparent cathode 444 has a transmittance of 90% or more.

Here, the translucent cathode 445 disposed between the transparent cathode 444 and the organic emission layer 143 may help electrons provided from the transparent cathode 444 to be easily injected into the organic emission layer 143 . In order to prevent the transmittance from being reduced in the transmissive regions T/A1 and T/A2 , the translucent cathode 445 may be disposed only in the light emitting regions D/A1 and D/A2 .

Referring to FIG. 4 , the transparent cathode 444 contacts the transparent auxiliary electrode 150 disposed in the transmission areas T/A1 and T/A2 and the non-display area N/A. Considering that the barrier rib 170 is disposed on the transparent auxiliary electrode 150 , in order for the transparent cathode 444 to contact the transparent auxiliary electrode 150 , step coverage of the transparent cathode 444 is required. It needs to be composed of high material. That is, as the transparent cathode 444 , indium zinc oxide (IZO) is in contact with the transparent auxiliary electrode 150 , and sufficient to be formed on the translucent cathode 445 , the transparent auxiliary electrode 150 and the barrier rib 170 . It has step coverage.

In consideration of the thickness of the transparent organic light emitting diode display 400 and the resistivity value of the transparent cathode 444 , the transparent cathode 444 may be disposed to have a thickness of 1000 to 1500 Å.

In the transparent organic light emitting diode display 400 according to another exemplary embodiment of the present invention, the transparent cathode 444 is disposed in both the transmission areas T/A1 and T/A2 and the emission areas D/A1 . Accordingly, even when the transparent cathode 444 having high transmittance is disposed in the transmissive regions T/A1 and T/A2, due to the high transmittance of the transparent cathode 444, in the transmissive regions T/A1 and T/A2 Light incident from the outside may be transmitted.

5A and 5B are cross-sectional views taken along line V-V' of FIG. 1 according to another embodiment of the present invention. 5A and 5B are cross-sectional views in the light emitting areas D/A1 and D/A2 and the non-display area N/A. The transparent organic light emitting diode display 500 shown in FIGS. 5A and 5B is not displayed. The transparent organic light emitting display shown in Fig. 4 except that the thickness of the transparent cathode 544 and the translucent cathode 545 in the area N/A is different from the thickness in the light emitting areas D/A1 and D/A2 Since it is substantially the same as the device 400 , a redundant description thereof will be omitted.

Referring to FIG. 5A , the translucent cathode 545 has a first thickness t1 in the first light-emitting area D/A1 and the second light-emitting area D/A2, and the first light-emitting area D/A1 A second thickness t2 may be provided in the non-display area N/A between the light emitting area D/A2 and the second emission area D/A2. Here, the second thickness t2 is greater than the first thickness t1. For example, the first thickness t1 may be about 100 Å to 200 Å, and the second thickness t2 may be about 200 Å to 400 Å.

Referring to FIG. 5B , in the transparent organic light emitting diode display 500 according to another embodiment of the present invention, the translucent cathode 545 includes the first light emitting area D/A1 and the second light emitting area D/A2 . has a first thickness t1 in , and a second thickness t2 in the non-display area N/A between the first light-emitting area D/A1 and the second light-emitting area D/A2. In detail, a portion of the semi-transparent cathode 545 is disposed to overlap in the non-display area N/A, so that the second thickness t2 of the semi-transparent cathode 545 is thicker than the first thickness t1 . That is, the translucent cathode 545 may vertically overlap the transparent auxiliary electrode 150 at a portion disposed with the second thickness t2 .

In the transparent organic light emitting display device 500 according to another exemplary embodiment of the present invention, the translucent cathode 545 is formed in as many areas as possible between the first light emitting area D/A1 and the second light emitting area D/A2. , since the second thickness t2 is thicker than the first thickness t2 , the wiring resistance of the transparent cathode 544 and the translucent cathode 545 can be further reduced. Accordingly, it is possible to further compensate for the voltage drop at the transparent cathode 544 and the translucent cathode 545 .

In addition, in the transparent organic light emitting diode display 500 according to another embodiment of the present invention, the distance between the translucent cathode 545 and the transparent anode 142 may form an optical distance of the microcavity. For example, the distance d between the translucent cathode 545 and the transparent anode 142 may satisfy the condition of mλ=2nd. Here, m is the order, λ is the wavelength of light emitted from each light emitting region, and n is the average refractive index of the plurality of organic material layers positioned between the translucent cathode 545 and the reflective layer 141 in each light emitting region. can mean As the distance between the translucent cathode 545 and the transparent anode 142 forms the optical distance of the microcavity, repeated reflection occurs between the translucent cathode 545 and the transparent anode 142, and the peak wavelength ( peak-wavelength) light efficiency is increased.

6 is a schematic cross-sectional view illustrating a transparent organic light emitting display device according to another exemplary embodiment. For convenience of explanation, FIG. 6 shows the first emission area D/A1, the first transmission area T/A1, the second transmission area T/A2, and the non-display area N/A of FIG. 1 . A portion of each is shown. The transparent organic light emitting diode display 600 shown in FIG. 6 further includes an insulating layer 663 disposed under the transparent auxiliary electrode 150 and a lower transparent auxiliary electrode 655 disposed under the insulating layer 663 . Since it is the same as the transparent organic light emitting diode display 100 shown in FIGS. 1 and 2 except for the above, a redundant description thereof will be omitted.

Referring to FIG. 6 , an insulating layer 663 is disposed under the transparent auxiliary electrode 150 . The insulating layer 663 is disposed on the planarization layer 161 and may be made of substantially the same transparent organic insulating material as the planarization layer 161 . For example, the planarization layer 161 and the insulating layer 663 may include a polyacrylates resin, an epoxy resin, a phenolic resin, a polyamides resin, or a polyimide-based resin. (polyimides rein), unsaturated polyesters resin, poly-phenyleneethers resin, poly-phenylenesulfides resin, and benzocyclobutene It may be formed of, but is not limited thereto, and may be formed of various organic insulators.

A connection electrode 644 is disposed between the insulating layer 663 and the planarization layer 161 . The connection electrode 644 is electrically connected to the second thin film transistor TFT2 through a contact hole provided in the planarization layer 161 , and the first light emitting region D/ through a contact hole provided in the insulating layer 663 . It is electrically connected to the reflective layer 141 in A1).

A lower transparent auxiliary electrode 655 is disposed under the insulating layer 663 to be separated from the connection electrode 644 . The lower transparent auxiliary electrode 655 partially overlaps the reflective layer 141 under the reflective layer 141 . That is, the lower transparent auxiliary electrode 655 overlaps not only the first transmission area T/A1 but also the non-display area N/A and the first emission area D/A1 , respectively. Accordingly, the area of the lower transparent auxiliary electrode 655 may be larger than the area of the transparent auxiliary electrode 150 .

Each of the lower transparent auxiliary electrode 655 and the connection electrode 644 may be formed of a transparent conductive oxide. In this case, even if the lower transparent auxiliary electrode 655 is disposed in the first transmitting area T/A1 and the second transmitting area T/A2, a decrease in transmittance by the lower transparent auxiliary electrode 655 does not substantially occur. it may not be In some embodiments, the lower transparent auxiliary electrode 655 , the connecting electrode 644 , the transparent anode 142 , the transparent auxiliary electrode 150 , and the transparent cathode 144 may all be made of the same transparent conductive oxide.

Referring to FIG. 6 , the lower transparent auxiliary electrode 655 is electrically connected to the transparent auxiliary electrode 150 disposed on the insulating layer 663 . For example, the lower transparent auxiliary electrode 655 is electrically connected to the transparent auxiliary electrode 150 in the non-display area N/A through a contact hole provided in the insulating layer 663 . For example, as shown in FIG. 6 , the lower transparent auxiliary electrode 655 and the transparent auxiliary electrode 150 are connected to each other in the contact area C/A.

As described above, since the lower transparent auxiliary electrode 655 is connected to the transparent auxiliary electrode 150, and the transparent auxiliary electrode 150 is connected to the transparent cathode 144 in the contact area C/A, the transparent cathode ( The wiring resistance of 144 is reduced by the transparent auxiliary electrode 150 and the lower transparent auxiliary electrode 655 . In particular, since the lower transparent auxiliary electrode 655 has an area larger than that of the transparent auxiliary electrode 150 , the total resistance of the transparent cathode 144 is increased when only the transparent auxiliary electrode 150 and the cathode 143 are connected to each other. can be further reduced. That is, the lower transparent auxiliary electrode 655 overlaps the transparent anode, and the lower transparent auxiliary electrode 655 is electrically insulated from the transparent anode by an insulating layer.

In addition, since the lower transparent auxiliary electrode 655 is made of a transparent conductive oxide in the same manner as the transparent auxiliary electrode 150 , the lower transparent auxiliary electrode 655 is formed in the first transmitting area T/A1 and the second transmitting area T /A2), a decrease in transmittance due to the lower transparent auxiliary electrode 655 may be minimized. Accordingly, the transparent organic light emitting display device 600 may have high transmittance, and a voltage drop phenomenon in the transparent organic light emitting display device 600 may be minimized.

7A and 7B are schematic plan views illustrating a transparent organic light emitting diode display according to another exemplary embodiment. The transparent organic light emitting diode display 700 illustrated in FIGS. 7A and 7B is less opaque than the transparent organic light emitting diode display 100 of FIG. 1 is electrically connected to the voltage supply pad unit 790 and the transparent auxiliary electrode 150 . The electrode 780 is further included, and only the configuration in which the opaque auxiliary electrode 780 vertically overlaps the translucent cathode 745 is different, and the other configurations are substantially the same, so the overlapping description will be omitted. In FIG. 7A , only the substrate 101 , the transparent auxiliary electrode 150 , the opaque auxiliary electrode 780 , the translucent cathode 745 , and the voltage supply pad part 790 are illustrated for convenience of illustration.

Referring to FIG. 7A , the transparent organic light emitting diode display 700 according to another exemplary embodiment further includes a voltage supply pad unit 790 . Specifically, the voltage supply pad part 790 is disposed to surround the periphery of the display area A/A in the substrate 101 . An area surrounding the display area A/A may be defined as an outer area of the transparent organic light emitting diode display 700 . In FIG. 7A , the voltage supply pad part 790 is exemplarily shown to completely surround the periphery of the display area A/A, and the voltage supply pad part 790 only partially surrounds the periphery of the display area A/A. may be placed. For example, the voltage supply pad unit 790 may be disposed only on the upper peripheral portion of the display area A/A. Here, the width 790 of the voltage supply pad portion may be about 500 to 1000 μm.

The translucent cathode 745 is disposed perpendicular to the opaque auxiliary electrode 780 and parallel to the transparent auxiliary electrode 150 . In FIG. 7A , for example, the translucent cathodes 745 do not overlap the transparent auxiliary electrode 150 and are alternately arranged to be spaced apart from each other. Specifically, the translucent cathode 745 is disposed to cover the light emitting area, and the transparent auxiliary electrode 150 is disposed to cover at least the transmissive area. Accordingly, the translucent cathode 745 and the transparent auxiliary electrode 150 may be disposed parallel to each other and spaced apart from each other.

In addition, although not directly shown in FIG. 7A , the transparent cathode may be disposed in both the light emitting region and the transmissive region. Accordingly, the transparent cathode may be electrically connected to the translucent cathode 745 and the transparent auxiliary electrode 150 . That is, the transparent cathode and the translucent cathode 745 are electrically connected to the transparent auxiliary electrode 150 , so that the total cathode resistance of the transparent organic light emitting diode display may be reduced.

In some embodiments, the translucent cathode 745 may be disposed to overlap the transparent auxiliary electrode 150 . That is, when the transparent auxiliary electrode 150 is disposed over the transmission region and the emission region, it may overlap the translucent cathode 745 disposed in the emission region.

The voltage supply pad unit 790 may be electrically connected to the transparent auxiliary electrode 150 , the semi-transparent cathode 745 , and the opaque auxiliary electrode 780 . Also, the voltage supply pad unit 790 may be electrically connected to the transparent cathode. Specifically, the voltage supply pad unit 790 may be electrically connected to the transparent cathode and the semi-transparent cathode 745 through a contact hole to supply the VSS voltage, which is a common voltage. In addition, the voltage supply pad unit 790 is also electrically connected to the transparent auxiliary electrode 150 and the opaque auxiliary electrode 780 through a contact hole. Accordingly, the transparent auxiliary electrode 150 and the opaque auxiliary electrode 780 are also electrically connected to the transparent cathode and the translucent cathode 745 , so that the overall resistance of the transparent cathode and the translucent cathode 745 can be greatly reduced. In the conventional transparent organic light emitting diode display, since the voltage supply pad portion is disposed on the entire edge of the substrate, there is a limitation in reducing the bezel area of the transparent organic light emitting display. Furthermore, since the voltage supply pad part is made of an opaque metallic material, even when the transparent organic light emitting diode display is not driven, the voltage supply pad part on which the bezel area is disposed is visually recognized by the user, and the aesthetics in the transmissive state is deteriorated. There was a problem.

In the transparent organic light emitting display device 700 according to another embodiment of the present invention, since the voltage supply pad part 790 may be disposed on only one side of the peripheral portion of the display area A/A in the substrate 110 , , a bezel area can be significantly reduced, and the aesthetics of a transparent organic light emitting display device can be improved by providing a transparent bezel.

Referring to FIG. 7B , an opaque auxiliary electrode 780 electrically connected to the transparent auxiliary electrode 150 is disposed in the non-display area N/A. The opaque auxiliary electrode 780 may be electrically connected to the cathode, and the same VSS voltage may be applied to the cathodes of all the light emitting areas D/A1 and D/A2.

The opaque auxiliary electrode 780 may be disposed under the transparent auxiliary electrode 150 . That is, the opaque auxiliary electrode 780 is disposed on the same plane as the reflective layer 141 and may be made of the same material as the reflective layer 141 . That is, since the opaque auxiliary electrode 780 is disposed in the non-display area N/A, transparency is unnecessary. Accordingly, the opaque auxiliary electrode 780 may be made of an opaque metal having a relatively low resistance.

The opaque auxiliary electrode 780 extends in a direction different from that of the transparent auxiliary electrode 150 . Accordingly, the opaque auxiliary electrode 780 and the transparent auxiliary electrode 150 may cross each other. The opaque auxiliary electrode 780 is connected to the transparent auxiliary electrode 150 in the non-display area N/A. For example, in a region where the opaque auxiliary electrode 780 and the transparent auxiliary electrode 150 intersect, the opaque auxiliary electrode 780 may directly contact the transparent auxiliary electrode 150 . Accordingly, the opaque auxiliary electrode 780 and the transparent auxiliary electrode 150 cross each other, thereby substantially forming a mesh pattern structure. That is, each of the auxiliary electrodes and the transparent cathode are organically arranged to have a specific pattern and are electrically connected to each other to provide transparency and transmittance to the transparent organic light emitting display device, and at the same time, the VSS voltage can be efficiently applied to the display area A/A. can supply

Also, as shown in FIG. 7B , the opaque auxiliary electrode 780 vertically overlaps the data line 110 and the VDD line 130 . Since the region in which the data line 110 and the VDD line 130 are disposed is substantially irrelevant to the luminous efficiency of the transparent organic light emitting diode display 700 , it overlaps the data line 110 and the VDD line 130 . When the opaque auxiliary electrode 780 is disposed, a decrease in the aperture ratio of the transparent organic light emitting display device 700 due to disposition of the opaque auxiliary electrode 780 may be minimized and the resistance of the entire cathode may be reduced. However, the opaque auxiliary electrode 780 is not limited to always vertically crossing the data line 110 , the VDD line 130 , or the transparent auxiliary electrode 150 , and may be disposed at a position that does not impair transmittance. .

As described above, since the opaque auxiliary electrode 780 is connected to the transparent auxiliary electrode 150 , the voltage drop of the cathode may be further reduced. That is, the opaque auxiliary electrode 780 intersects the transparent auxiliary electrode 150 , and in the intersecting region where the opaque auxiliary electrode 780 and the transparent auxiliary electrode 150 intersect, the opaque auxiliary electrode 780 and the transparent auxiliary electrode 150 . ) are connected to each other to form a mesh pattern. Since the same VSS voltage is provided to all mesh patterns, the cathodes of each pixel connected to the mesh pattern are all provided with the same VSS voltage. Accordingly, the voltage drop phenomenon in the transparent organic light emitting display device 400 may be more efficiently reduced, and the luminance non-uniformity phenomenon may be improved even if the area of the transparent organic light emitting display device 400 is increased.

8 is a flowchart illustrating a method of manufacturing a transparent organic light emitting display device according to an exemplary embodiment. 9A to 9F are schematic cross-sectional views illustrating a method of manufacturing a transparent organic light emitting display device according to an exemplary embodiment. 9A to 9E, the first thin film transistor and the storage capacitor are omitted, and the first light emitting area D/A1, the second transmission area T/A2, and the non-display area N/A shown in FIG. 1 are shown in FIG. A portion of each is shown.

Referring to FIG. 8 , first, in the method of manufacturing a transparent organic light emitting display device according to an embodiment of the present invention, a transparent anode and a transparent auxiliary separated from the transparent anode are formed on a substrate having a light emitting area and a transmissive area separated from the light emitting area An electrode is formed (S810).

Referring to FIG. 9A , a first thin film transistor, a storage capacitor, a second thin film transistor TFT2, a data line, a gate line, and a VDD line are respectively formed on a substrate 101 . Thereafter, a planarization layer 161 is formed to cover the first thin film transistor, the storage capacitor, the second thin film transistor TFT2 , the data line, the gate line, and the VDD line. Thereafter, a contact hole exposing the second thin film transistor TFT2 is formed in the planarization layer 161 .

A reflective layer 141 connected to the second thin film transistor TFT2 and an opaque auxiliary electrode 780 are formed on the planarization layer 161 . For example, a metal layer is formed to fill the contact hole of the planarization layer 161 . Thereafter, the reflective layer 141 is formed in the first emission area D/A1 by patterning the metal layer, and the opaque auxiliary electrode 780 is formed in the non-display area N/A.

Referring to FIG. 9B , a transparent conductive oxide layer 945 is formed to cover the reflective layer 141 and the opaque auxiliary electrode 780 . The transparent conductive oxide layer 945 is formed to cover the first emission area D/A1 , the second transmission area T/A2 , and the non-display area N/A. For example, the transparent conductive oxide layer 945 may be formed by a deposition process such as sputtering or atomic layer deposition (ALD). However, the method of forming the transparent conductive oxide layer 945 is not limited thereto, and the transparent conductive oxide layer 945 may be formed by a printing process or a coating process.

Referring to FIG. 9C , the transparent auxiliary electrode 150 and the transparent anode 142 separated from the transparent auxiliary electrode 150 and disposed on the reflective layer 141 are formed by patterning the transparent conductive oxide layer 945 . For example, the transparent anode 142 and the transparent auxiliary electrode 150 are formed by performing a photolithography process using a mask that exposes the region where the transparent anode 142 and the transparent auxiliary electrode 150 are to be formed. can be formed.

Thereafter, a bank 162 covering the transparent anode 142 and the transparent auxiliary electrode 150 is formed, and a part of the bank 162 is removed to form an opening. The upper surface of the transparent anode 142 is exposed in the first light emitting area D/A1 through the opening, and the upper surface of the transparent auxiliary electrode 150 in the second transmission area T/A2 and the contact area C/A each is exposed. For example, the opening may be formed by a photolithography process using a mask in which the first emission area D/A1 , the second transmission area T/A2 , and the contact area C/A are exposed.

Thereafter, an organic light emitting layer is formed on the transparent anode ( S820 ).

Referring to FIG. 9D , the barrier rib 170 is formed on the transparent auxiliary electrode 150 exposed in the contact area C/A of the non-display area N/A. As described above, the partition wall 170 may be formed in a reverse tapered shape. The barrier rib 170 may be formed using a negative photoresist. For example, after the negative photoresist is applied to cover the non-display area N/A, the negative photoresist is partially exposed and developed to form the barrier rib 170 having a reverse tapered shape. The reverse taper shape of the barrier rib 170 may be changed by controlling an exposure temperature and a bake temperature of the negative photoresist.

Referring to FIG. 9E , an organic emission layer 143 is formed on the exposed transparent anode 142 . For example, the organic emission layer 143 is formed on the transparent anode 142 in the first emission area D/A1 and on the transparent auxiliary electrode 150 in the second transmission area T/A2, , are respectively formed on the upper surface of the bank 162 and the upper surface of the barrier rib 170 in the non-display area N/A. A method of forming the organic light emitting layer 143 is not particularly limited. For example, the organic light emitting layer 143 may be formed through a front deposition method in which an organic material is vaporized and deposited. However, the method of forming the organic light emitting layer 143 is not limited thereto, and the organic light emitting layer 143 may be mask-free such as LITI (Laser Induced Thermal Imaging), LIPS (Laser Induced Pattern-wise Sublimation), or Soluble Printing. free) process.

Thereafter, a transparent cathode 144 is formed on the organic emission layer 143 ( S830 ). The transparent cathode 144 is formed to cover all of the organic emission layer 143 , the bank 162 , the transparent auxiliary electrode 150 , and the barrier rib 170 . The transparent cathode 144 may be formed by a deposition process such as sputtering or ALD. As described above, since the transparent conductive oxide has a high step coverage, the transparent cathode 144 is formed on the top surface of the bank 162, the side surface of the bank 162, and the barrier rib 170 in the non-display area N/A. It may be formed to cover both the side surface and the upper surface of the partition wall 170 . Accordingly, the transparent auxiliary electrode 150 exposed between the side surface of the barrier rib 170 and the side surface of the bank 162 comes into contact with the transparent cathode 144 . Accordingly, the transparent cathode 144 electrically connected to the transparent auxiliary electrode 150 is formed.

Thereafter, a translucent cathode 145 may be formed on the transparent cathode 144 .

Referring to FIG. 9F , a translucent cathode 145 is formed on the transparent cathode 144 in the light emitting area D/A1. Here, the translucent cathode 145 has a very thin thickness and a low work function metallic material (eg, silver (Ag), titanium (Ti), aluminum (Al), molybdenum (Mo), or silver (Ag) and magnesium). (alloy of Mg, etc.), the transmittance to light is lower than that of the transparent cathode 144 . Accordingly, even if the translucent cathode 145, which is a metallic material, is formed to have a thin thickness, high transmittance cannot be achieved. In order to secure transmittance in /A1 and T/A2 , the translucent cathode 145 is not disposed in the transmission areas T/A1 and T/A2 .

Although not shown in FIGS. 9A to 9F , the translucent cathode 145 may be formed before the transparent cathode 144 in the light emitting area D/A1 and disposed below the transparent cathode 144 . In this case, the translucent cathode 145 disposed between the transparent cathode 444 and the organic emission layer 143 may help electrons provided from the transparent cathode 144 to be easily injected into the organic emission layer 143 . However, in order to prevent a decrease in transmittance in the transmission areas T/A1 and T/A2 , the translucent cathode 445 may be disposed only in the emission areas D/A1 and D/A2 .

Also, although not shown in FIGS. 9A to 9F , a lower transparent auxiliary electrode and an insulating layer may be additionally formed under the transparent auxiliary electrode. For example, a transparent conductive oxide layer may be formed on the planarization layer to be connected to the second thin film transistor, and a lower transparent auxiliary electrode and a connection electrode may be respectively formed by patterning the transparent conductive oxide layer. Thereafter, an insulating layer covering the lower transparent auxiliary electrode and the connection electrode is formed, and a first contact hole exposing a portion of the connection electrode in the light emitting area and a second contact hole exposing a portion of the transparent auxiliary electrode in the non-display area are respectively formed. formed on the insulating layer. Thereafter, a transparent anode connected to the connection electrode through the first contact hole and a transparent auxiliary electrode connected to the lower transparent auxiliary electrode through the second contact hole may be formed. In this case, the lower transparent auxiliary electrode, the transparent anode, the transparent auxiliary electrode, and the cathode may all be formed of the same transparent conductive oxide.

As described above, in the method of manufacturing a transparent organic light emitting diode display according to an embodiment of the present invention, the transparent anode 142 and the transparent auxiliary electrode 150 may be simultaneously formed through a patterning process. Accordingly, a separate process for forming the transparent auxiliary electrode 150 is not required, and since the transparent auxiliary electrode 150 can be formed by changing the shape of the mask used in the patterning process, the transparent auxiliary electrode 150 is can be easily formed.

Although the 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 within the scope 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 spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100, 300, 400, 500, 600, 700: transparent organic light emitting display device
101: substrate
110: data wiring
120: gate wiring
130: VDD wiring
141: reflective layer
142: transparent anode
143: organic light emitting layer
144, 444, 544: transparent cathode
145, 345, 445, 545, 745: translucent cathode
150: transparent auxiliary electrode
161: planarization layer
162: bank
170: bulkhead
644: connecting electrode
655: lower transparent auxiliary electrode
663: insulating layer
780: opaque auxiliary electrode
790: voltage supply pad unit
945: transparent conductive oxide layer
TFT1: first thin film transistor
TFT2: second thin film transistor
Cst: storage capacitor
D/A1: first light emitting area
D/A2: second light emitting area
T/A1: first transmissive area
T/A2: second transmissive area
N/A: non-display area
C/A: contact area

Claims (22)

a light emitting region in which a transparent anode, an organic light emitting layer, and a transparent cathode are disposed; and
A transparent auxiliary electrode is disposed and comprises a transmissive region configured to transmit external light;
A translucent cathode is disposed between the light emitting area and the adjacent light emitting area,
The transparent auxiliary electrode is made of the same material as the transparent anode and is disposed to be spaced apart from the transparent anode,
The transparent cathode extends into the transmission region and is electrically connected to the transparent auxiliary electrode;
the translucent cathode has a first thickness and a second thickness;
The first thickness is thinner than the second thickness,
In the light emitting region, the translucent cathode of the first thickness is disposed,
and a translucent cathode having the second thickness is disposed between the adjacent light emitting regions. According to claim 1,
The transparent anode, the transparent cathode and the transparent auxiliary electrode are a transparent conductive oxide,
The transparent organic light emitting display device of claim 1, wherein the transparent cathode is a material different from that of the transparent anode and the transparent auxiliary electrode. 3. The method of claim 2,
The transparent organic light-emitting display device, characterized in that the transparent cathode is made of a material that relatively less generates foreign matter than the transparent anode and the transparent auxiliary electrode. 4. The method of claim 3,
A transparent encapsulation layer comprising at least a first inorganic encapsulation layer, an organic material layer, and a second inorganic encapsulation layer,
and the transparent encapsulation layer is disposed on the transparent cathode to cover the emission area and the transmission area. According to claim 1,
Further comprising a barrier rib disposed on the transparent auxiliary electrode,
The organic light emitting layer is disposed to cover the transmission region, the transparent cathode is made of a material having a higher step coverage than the organic light emitting layer, and is electrically connected to the transparent auxiliary electrode. According to claim 1,
an insulating layer disposed under the transparent auxiliary electrode and the transparent anode; and
It further comprises a lower transparent auxiliary electrode disposed under the insulating layer,
The lower transparent auxiliary electrode is electrically connected to the transparent auxiliary electrode through a contact hole located in the insulating layer,
An area of the lower transparent auxiliary electrode is larger than an area of the transparent auxiliary electrode. 7. The method of claim 6,
the lower transparent auxiliary electrode overlaps the transparent anode;
and the lower transparent auxiliary electrode is electrically insulated from the transparent anode by the insulating layer. According to claim 1,
and the transparent auxiliary electrode is configured to completely cover the transparent area. According to claim 1,
an insulating layer disposed under the transparent auxiliary electrode and the transparent anode; and
It further comprises an opaque auxiliary electrode disposed on the insulating layer and electrically connected to the transparent auxiliary electrode,
The opaque auxiliary electrode is disposed between the light emitting area and an adjacent light emitting area adjacent to the light emitting area. 10. The method of claim 9,
Further comprising a data line disposed in the light emitting area,
and the data line and the opaque auxiliary electrode are vertically crossed. a light emitting region in which a reflective layer, a transparent anode, an organic light emitting layer, and a transparent cathode are disposed; and
A transparent auxiliary electrode is disposed and comprises a transmissive region configured to transmit external light;
A translucent cathode is disposed between the light emitting area and the adjacent light emitting area,
The light emitted from the organic light emitting layer is reflected by the reflective layer and is configured to pass through the transparent cathode,
the transparent cathode is disposed to cover the light emitting region and the transmissive region and is electrically connected to the transparent auxiliary electrode;
the translucent cathode has a first thickness and a second thickness;
The first thickness is thinner than the second thickness,
In the light emitting region, the translucent cathode of the first thickness is disposed,
and a translucent cathode having the second thickness is disposed between the adjacent light emitting regions. 12. The method of claim 11,
The translucent cathode is made of a metallic material,
The transparent organic light emitting display device, characterized in that the work function of the translucent cathode is smaller than the work function of the transparent cathode. delete 12. The method of claim 11,
the second thickness is twice the first thickness;
The transmittance of the first thick region is higher than the transmittance of the second thick region,
The transparent organic light emitting display device of claim 1 , wherein a resistance of the second thick region is lower than a resistance of the first thick region. 12. The method of claim 11,
and the translucent cathode is disposed between the organic light emitting layer and the transparent cathode. 12. The method of claim 11,
The translucent cathode and the transparent auxiliary electrode are disposed parallel to each other,
The transparent organic light emitting display device, characterized in that the translucent cathode is disposed to completely cover the light emitting area. 12. The method of claim 11,
and the translucent cathode and the transparent auxiliary electrode are disposed to be spaced apart from each other and electrically connected to each other by the transparent cathode. forming a transparent anode on a substrate having a light emitting region, and forming a transparent auxiliary electrode on a substrate having a transmissive region configured to transmit external light to be spaced apart from the transparent anode;
forming an organic light emitting layer on the transparent anode;
forming a transparent cathode by extending into the transmissive region so as to be electrically connected to the transparent auxiliary electrode; and
Forming a translucent cathode in the light emitting area and adjacent light emitting area so as to be in contact with the transparent cathode,
The transparent anode, the organic light emitting layer, and the transparent cathode are formed in the light emitting region, and the transparent auxiliary electrode is made of the same material as the transparent anode,
the translucent cathode has a first thickness and a second thickness;
The first thickness is thinner than the second thickness,
In the light emitting region, the translucent cathode of the first thickness is disposed,
The method of claim 1 , wherein the translucent cathode having the second thickness is disposed between the adjacent light emitting regions. 19. The method of claim 18,
The method of claim 1, wherein the transparent cathode, the transparent anode, and the transparent auxiliary electrode are formed by a sputtering process. 19. The method of claim 18,
The step of forming the transparent anode and the transparent auxiliary electrode,
forming a reflective layer in the light emitting area;
forming a transparent conductive oxide layer to cover the reflective layer; and
and forming the transparent auxiliary electrode and the transparent anode separated from the transparent auxiliary electrode and disposed on the reflective layer by patterning the transparent conductive oxide layer. Way. 21. The method of claim 20,
The forming of the reflective layer may include forming an opaque auxiliary electrode between the emission region and an adjacent emission region adjacent to the emission region on the same plane as the reflection layer. manufacturing method. 19. The method of claim 18,
The transparent cathode is formed in common in the transmission region and the light emitting region,
The method of claim 1 , wherein the translucent cathode is made of a metallic material.

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