Transparent display device

Abstract

A transparent display device in one example includes: a first substrate having a transmissive region that transmits external light and a non-transmissive region that does not transmit external light; a light emitting device disposed in the non-transmissive area on the first substrate to emit light; and an organic pattern layer disposed in the transmissive region on the first substrate. The light emitting device includes a first electrode disposed in the emission region, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer. The second electrode is disposed in a region where the organic pattern layer is not disposed, and is in contact with an edge of the organic pattern layer.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0191611, filed in Korea on December 26, 2023, the entire content of which is hereby expressly incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to a transparent display device. Background Art

[0004] With the development of an information - oriented society, the demand for display devices for displaying images has increased in various forms. Various types of display devices, such as liquid crystal display (LCD) devices, plasma display panel (PDP) devices, quantum dot light - emitting display (QLED), and organic light - emitting display (OLED) devices, have been widely used.

[0005] In recent years, active research has been conducted on display devices that allow users to view objects or images located on the rear surface of the display device. A transparent display device may include a transmissive area that allows external light to pass through, and may have a high light transmittance through the transmissive area in the display area. Summary of the Invention

[0006] The present disclosure aims to provide a transparent display device that substantially eliminates one or more problems caused by the limitations and disadvantages of the related art.

[0007] One aspect of the present disclosure aims to provide a transparent display device capable of improving light transmittance.

[0008] Another aspect of the present disclosure aims to provide a transparent display device capable of preventing the occurrence of unevenness and light leakage phenomena.

[0009] Another aspect of the present disclosure aims to provide a transparent display device capable of achieving ESG (Environment / Society / Governance) by reducing the generation of greenhouse gases caused by the manufacturing processes for producing the display device.

[0010] Additional advantages and features of the present disclosure will be partially described in the following description, and will be partially apparent to those of ordinary skill in the art after reviewing the following, or may be learned from the practice of the present disclosure. Other benefits of the present disclosure may be realized and obtained through the structures specifically pointed out in the written description, claims, and drawings herein.

[0011] To achieve these and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, there is provided a transparent display device including: a first substrate having a transmissive region that transmits external light and a non-transmissive region that does not transmit external light; a light-emitting device disposed in the non-transmissive region on the first substrate to emit light; and an organic pattern layer disposed in the transmissive region on the first substrate, wherein the light-emitting device includes: a first electrode disposed in an emission region; a light-emitting layer disposed on the first electrode; and a second electrode disposed on the light-emitting layer, wherein the second electrode is disposed in a region where the organic pattern layer is not provided and is in contact with an edge of the organic pattern layer.

[0012] In another aspect of the present disclosure, there is provided a transparent display device including: a transmissive region that transmits external light; an emission region that emits light; a light-emitting device disposed in the emission region and including a first electrode, a light-emitting layer, and a second electrode; an organic pattern layer at least a part of which is disposed on the same layer as the second electrode of the light-emitting device; and a black matrix disposed corresponding to the light-emitting device in the emission region, wherein the second electrode includes an opening region that overlaps at least a part of the transmissive region and at least a part of the region where the black matrix is provided, and wherein the organic pattern layer is disposed in the opening region of the second electrode.

[0013] It should be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the claimed present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0015] Figure 1 is a plan view schematically showing a transparent display device according to one or more embodiments of the present disclosure;

[0016] Figure 2 is Figure 1 an example of the region A shown;

[0017] Figure 3 is Figure 2 an example of a circuit diagram of a sub-pixel shown;

[0018] Figure 4 is a cross-sectional view showing an example taken along the line I-I' shown in Figure 2 shown;

[0019] Figure 5 is a plan view showing an example of a second electrode and an organic pattern layer of a light-emitting device according to an aspect of the present disclosure;

[0020] Figure 6 is a cross-sectional view showing an example of a method for forming an organic pattern layer according to an aspect of the present disclosure;

[0021] Figure 7 is a cross-sectional view showing an example of a method for forming a second electrode of a light-emitting device according to an aspect of the present disclosure;

[0022] Figure 8 is a graph for showing the light transmittance of an organic pattern layer according to an aspect of the present disclosure;

[0023] Figure 9 shows according to Figure 4 a stacked structure of an example of region B;

[0024] Figure 10 shows according to Figure 4 a stacked structure of an example of region C;

[0025] Figure 11 is showing a cross-section of another example taken along line I-I' shown in Figure 2 and;

[0026] Figure 12 is a plan view showing another example of a second electrode and an organic pattern layer of a light-emitting device according to an aspect of the present disclosure. Detailed Description

[0027] Advantages and features of the present disclosure and methods for realizing them will be clarified by the following embodiments described with reference to the drawings. However, the present disclosure may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is only defined by the scope of the claims.

[0028] The shapes, dimensions, ratios, angles, and numbers disclosed in the drawings for describing the embodiments of the present disclosure are only examples, and thus the present disclosure is not limited to the details shown. Like reference numerals always refer to like elements. In the following description, when the detailed description of related known technologies is determined to unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. In the case of using "comprising", "having", and "including" described in the present disclosure, other parts may be added unless "only" is used. Singular terms may include plural forms unless stated otherwise.

[0029] When explaining an element, although there is no explicit description, the element is construed to include an error range.

[0030] When describing a positional relationship, for example, when the positional relationship between two parts is described as "on...", "above...", "below...", and "next to...", one or more other parts may be disposed between the two parts, unless "exactly" or "directly" is used.

[0031] When describing a temporal relationship, for example, when describing a temporal precedence relationship such as "after", "then", "next", "before", etc., it may include discontinuous cases, unless "immediately" or "directly" is used.

[0032] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from other elements. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0033] The term "at least one" should be understood to include any and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of the first item, the second item, and the third item" represents all combinations of two or more items selected from the first item, the second item, and the third item, as well as the first item, the second item, or the third item. In addition, the term "capable of" fully encompasses all meanings and scopes of the term "may".

[0034] The features of the various embodiments of the present disclosure may be partially or fully coupled or combined with each other, and various interoperations and drivings may be performed technically. The embodiments of the present disclosure may be executed independently of each other, or may be executed together in a mutually dependent relationship.

[0035] Hereinafter, with reference to the accompanying drawings, an example of a display device according to the present disclosure will be described. When assigning reference numerals to components in each drawing, the same components may, as much as possible, have the same reference numerals, even if they are shown in different drawings. In addition, when the detailed description of related known technologies is determined to unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted.

[0036] Hereinafter, one or more embodiments of the present disclosure will be described with reference to the accompanying drawings. All components of each display device according to all embodiments of the present disclosure are operably coupled and configured.

[0037] Figure 1is a plan view schematically showing a transparent display device according to one or more embodiments of the present disclosure. Figure 2 is Figure 1 an example of the region A shown. Figure 3 is Figure 2 an example of a circuit diagram of the sub-pixels shown.

[0038] Hereinafter, the X-axis represents a direction parallel to the gate line, the Y-axis represents a direction parallel to the data line, and the Z-axis represents the height direction of the transparent display device 100. However, other variations are also possible.

[0039] An example in which the transparent display device 100 according to one or more embodiments of the present disclosure is implemented as an organic light emitting display device will be mainly described, but the transparent display device 100 may be implemented as a liquid crystal display (LCD) device, a plasma display panel (PDP), a quantum dot light emitting display (QLED) device, or an electrophoretic display device.

[0040] Referring to Figures 1 to 2 , the transparent display device 100 according to one or more embodiments of the present disclosure may include a transparent display panel 110. The transparent display panel 110 may be divided into a display area DA (or active area) and a non-display area NDA (or inactive area). The display area DA includes a plurality of pixels P and displays an image. The non-display area NDA does not display an image. The non-display area NDA may completely or only partially surround the display area DA.

[0041] The non-display area NDA may include a pad area PA on which pads are provided and at least one scan driver 205. The scan driver 205 may be formed in the non-display area NDA in a gate-in-panel (GIP) type outside one or both sides of the display area DA. Alternatively, the scan driver 205 may be manufactured as a driver chip, mounted on a flexible film, and attached to the non-display area NDA in a tape automated bonding (TAB) type outside one or both sides of the display area DA.

[0042] The display area DA may include a first signal line SL1, a second signal line SL2, and a pixel P. The first signal line SL1 may extend in a first direction (e.g., along the Y-axis direction) in the display area DA. In one example, the first signal line SL1 may be a data line, but they are not necessarily limited thereto. The first signal line SL1 may include at least one of a first power line, a second power line, and a reference line.

[0043] The second signal line SL2 can extend from the display area DA in a second direction (e.g., along the X-axis direction), and can intersect the first signal line SL1 in the display area DA. In one example, the second signal line SL2 can be a gate line, but they are not necessarily limited thereto.

[0044] As Figure 2 shown, the display area DA includes a transmissive area TA and a non-transmissive area NTA. The transmissive area TA is an area that transmits most of the light incident from the outside. The non-transmissive area NTA is an area that does not transmit most of the light incident from the outside. For example, the transmissive area TA can have a light transmittance greater than α%, and the non-transmissive area NTA can have a light transmittance less than β%. In this example, α is greater than β, and each of α and β can be a positive number. Due to the transmissive area TA of the transparent display panel 110, the transparent display device 100 can allow viewing of an object or a background scene located at the rear surface of the transparent display device 100.

[0045] The non-transmissive area NTA includes an emission area EA, and a plurality of pixels P are arranged in the emission area EA to emit light. The non-transmissive area NTA also includes a non-emission area provided between the emission areas EA. Each of the plurality of pixels P can include at least two sub-pixels SP. For example, each of the plurality of pixels P can include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The first sub-pixel SP1 can include a first emission area EA1 that emits light of a first color. The second sub-pixel SP2 can include a second emission area EA2 that emits light of a second color. The third sub-pixel SP3 can include a third emission area EA3 that emits light of a third color. However, they are not necessarily limited thereto. Each of the plurality of pixels P can also include a fourth sub-pixel SP4 that emits white light.

[0046] For example, the first to third emission areas EA1, EA2, and EA3 can emit light of different colors. For example, the first emission area EA1 can emit green light, and the second emission area EA2 can emit red light. The third emission area EA3 can emit blue light. However, they are not necessarily limited thereto. In addition, the arrangement order of each of the sub-pixels SP1, SP2, and SP3 can be changed in various ways.

[0047] The non-transmissive area NTA may include data lines DL and gate lines GL connected to the sub-pixels SP1, SP2, and SP3. The data lines DL may extend from the non-transmissive area NTA in a first direction (e.g., along the Y-axis direction) and may supply data voltages to each of the sub-pixels SP1, SP2, and SP3. The gate lines GL may extend from the non-transmissive area NTA in a second direction (e.g., along the X-axis direction) and may supply scan signals to each of the sub-pixels SP1, SP2, and SP3. The data lines DL and the gate lines GL may be arranged to overlap with the sub-pixels SP1, SP2, and SP3.

[0048] Each of the sub-pixels SP1, SP2, and SP3 is turned on by a scan signal, and when the data voltage of the data line DL is supplied to the gate electrode of the driving transistor, the light-emitting device may emit light according to the drain-source current of the driving transistor.

[0049] Referring Figure 3 , each of the sub-pixels SP1, SP2, and SP3 may have a 2T1C structure including two transistors DT and ST and one capacitor Cst, but it is not necessarily limited thereto. Each of the sub-pixels SP1, SP2, and SP3 may further include a compensation circuit CC. In this example, each of the sub-pixels SP1, SP2, and SP3 may have various structures, such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, 7T2C, etc.

[0050] Each of the transistors DT and ST in each of the sub-pixels SP1, SP2, and SP3 may include a gate electrode, a source electrode, and a drain electrode. Since the source electrode and the drain electrode are not fixed and may change according to the direction of the voltage and current applied to the gate electrode, one of the source electrode and the drain electrode may be represented as the first electrode, and the other may be represented as the second electrode. The transistors DT and ST of each of the sub-pixels SP1, SP2, and SP3 may use at least one of a polysilicon semiconductor, an amorphous silicon semiconductor, and an oxide semiconductor. The transistors DT and ST may be P-type or N-type, or a mixture of P-type and N-type.

[0051] The light-emitting device ED may include an anode electrode connected to a driving transistor DT, a cathode electrode supplied with a second supply voltage EVSS from a second power line PL2, and a light-emitting layer between the anode electrode and the cathode electrode. The anode electrode may be an independent electrode for each light-emitting device ED, while the cathode electrode may be a common electrode shared by all the light-emitting devices ED. When a driving current is supplied from the driving transistor DT to the light-emitting device ED, electrons are injected from the cathode electrode into the light-emitting layer, and holes are injected from the anode electrode into the light-emitting layer, so that a fluorescent material or a phosphorescent material emits light through the recombination of electrons and holes in the light-emitting layer, thereby generating light whose brightness is proportional to the value of the driving current.

[0052] In each of the sub-pixels SP1, SP2, and SP3, the driving transistor DT is connected between the anode electrode of the light-emitting device ED and a first power line PL1 supplied with a driving voltage EVDD. Here, the driving voltage EVDD is applied to a first electrode of the driving transistor DT.

[0053] The driving transistor DT is a transistor that drives the light-emitting device ED and is controlled by a voltage applied to a gate electrode to supply a current to the light-emitting device ED. Thus, the light-emitting device ED can be driven.

[0054] In each of the sub-pixels SP1, SP2, and SP3, a switching transistor ST is connected between a first node N1 of the driving transistor DT and a data line DL. The switching transistor ST is controlled by a scan signal Scan supplied from a gate line GL to apply a data voltage Vdata supplied from the data line DL to the first node N1.

[0055] In each of the sub-pixels SP1, SP2, and SP3, a capacitor Cst is connected to the first node N1, and the voltage applied to the first node N1 is charged into the capacitor Cst. The capacitor Cst can supply the charged data voltage to the driving transistor DT. The capacitor Cst may be a storage capacitor.

[0056] A compensation circuit CC may be provided to compensate for the threshold voltage, etc. of the driving transistor DT. The compensation circuit CC may include one or more transistors. The compensation circuit CC may include one or more transistors and capacitors and may be configured in various ways according to the compensation method. Each of the sub-pixels including the compensation circuit CC may have various structures, such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, 7T2C, etc.

[0057] Hereinafter, Figures 4 to 10 Each component of the transparent display panel 110 according to one or more embodiments of the present disclosure will be described in more detail.

[0058] Figure 4is a cross-sectional view showing an example taken along line I-I’ shown in Figure 2 and is a plan view showing an example of a second electrode and an organic pattern layer of a light-emitting device according to an aspect of the present disclosure, Figure 5 is a cross-sectional view showing an example of a method for forming an organic pattern layer according to an aspect of the present disclosure, Figure 6 is a cross-sectional view showing an example of a method for forming a second electrode of a light-emitting device according to an aspect of the present disclosure, Figure 7 is a cross-sectional view showing an example of a method for forming a second electrode of a light-emitting device according to an aspect of the present disclosure, Figure 8 is a graph for showing the transmittance of an organic pattern layer according to an aspect of the present disclosure, Figure 9 shows an example of a stacked structure of region B according to Figure 4 and shows an example of a stacked structure of region C according to Figure 10 shows an example of a stacked structure of region C according to Figure 4 of the present disclosure.

[0059] Referring to Figure 4 , a transparent display panel 110 according to one or more examples of the present disclosure includes a first substrate 111 and a second substrate 112 facing each other. Circuit elements, a light-emitting device ED, an organic pattern layer 165, a packaging layer 180, a color filter CF, and a black matrix BM may be disposed between the first substrate 111 and the second substrate 112.

[0060] Circuit elements are provided for each of the sub-pixels SP1, SP2, and SP3. The circuit elements may include various signal lines, thin film transistors, and capacitors, etc. The signal lines may include gate lines, data lines, driving power lines, etc. The thin film transistors may include a switching transistor ST and a driving transistor DT. The switching transistor ST may be switched according to a scan signal supplied to the gate line to charge a capacitor Cst with a data voltage supplied from the data line.

[0061] The driving transistor DT may be switched according to the data voltage charged in the capacitor Cst, generate a data current according to a driving voltage EVDD supplied from a first power line PL1, and supply the data current to a first electrode E1 of each of the sub-pixels SP1, SP2, and SP3. The driving transistor DT may include an active layer ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0062] Specifically, as Figure 4 shown, a buffer layer 120 may be disposed on the first substrate 111. The buffer layer 120 may protect the driving transistor DT from damage by moisture penetrating through the first substrate 111 vulnerable to moisture penetration. To this end, the buffer layer 120 may be disposed in a non-transmissive region NTA and a transmissive region TA. The buffer layer 120 may be formed of an inorganic layer such as a silicon oxide layer SiOx, a silicon nitride layer SiNx, or a multi-layer thereof.

[0063] Although Figure 4 not shown in the figure, a light-blocking layer may be further provided between the first substrate 111 and the buffer layer 120. The light-blocking layer may be used to block external light incident on the active layer ACT in the region where the driving transistor DT is formed. The light-blocking layer may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu) or an alloy thereof. The light-blocking layer may be omitted.

[0064] The active layer ACT of the driving transistor DT may be provided on the buffer layer 120. The active layer ACT of the driving transistor DT may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material.

[0065] A gate insulating layer 130 may be provided on the active layer ACT of the driving transistor DT. The gate insulating layer 130 may be provided in the non-transmissive region NTA and the transmissive region TA. The gate insulating layer 130 may be formed of an inorganic layer such as a silicon oxide layer SiOx, a silicon nitride layer SiNx, or a multi-layer thereof.

[0066] The gate electrode GE of the driving transistor DT may be provided on the gate insulating layer 130. The gate electrode GE of the driving transistor DT may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu) or an alloy thereof.

[0067] A first interlayer insulating layer 140 and a second interlayer insulating layer 145 may be provided on the gate electrode GE of the driving transistor DT. In order to increase the light transmittance of the transmissive region TA, the first interlayer insulating layer 140 and the second interlayer insulating layer 145 may be provided only in the non-transmissive region NTA and not in the transmissive region TA. Each of the first interlayer insulating layer 140 and the second interlayer insulating layer 145 may be formed of an inorganic layer such as a silicon oxide layer SiOx, a silicon nitride layer SiNx, or a multi-layer thereof.

[0068] The source electrode SE and the drain electrode DE of the driving transistor DT may be provided on the second interlayer insulating layer 145. Each of the source electrode SE and the drain electrode DE of the driving transistor DT may be connected to the active layer ACT of the driving transistor DT through a first contact hole CH1 that penetrates the gate insulating layer 130, the first interlayer insulating layer 140, and the second interlayer insulating layer 145. The source electrode SE and the drain electrode DE of the driving transistor DT may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu) or an alloy thereof.

[0069] A first planarization layer 150 may be provided on a source electrode SE and a drain electrode DE of a driving transistor DT to planarize a step difference caused by the driving transistor DT. The first planarization layer 150 may be formed of an organic layer such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0070] An auxiliary electrode AE may be provided on the first planarization layer 150. The auxiliary electrode AE may be connected to one of the source electrode SE and the drain electrode DE of the driving transistor DT through a second contact hole CH2 penetrating the first planarization layer 150. The auxiliary electrode AE may be formed as a single layer or a multi-layer made of any one of molybdenum Mo, aluminum Al, chromium Cr, gold Au, titanium Ti, nickel Ni, neodymium Nd, and copper Cu or an alloy thereof.

[0071] A second planarization layer 155 may be formed on the auxiliary electrode AE. The second planarization layer 155 may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0072] At least one of the first planarization layer 150 and the second planarization layer 155 may be provided in a non-transmissive region NTA and not provided in at least a part of a transmissive region TA.

[0073] In one or more embodiments, as Figure 4 shown, the second planarization layer 155 may include a first opening region OA1 overlapping at least a part of the transmissive region TA. For example, the first opening region OA1 of the second planarization layer 155 may be formed to have a size larger than the size of the transmissive region TA. In this example, the first opening region OA1 of the second planarization layer 155 may overlap all regions of the transmissive region TA. The second planarization layer 155 may include a flat upper surface S1a and an inclined surface S1b exposed by the first opening region OA1. The upper surface S1a and the inclined surface S1b of the second planarization layer 155 may be provided in the non-transmissive region NTA.

[0074] Although Figure 4 shown that the first opening region OA1 is only provided in the second planarization layer 155, the present disclosure is not limited thereto. In another embodiment, the first opening region OA1 may be provided in each of the first planarization layer 150 and the second planarization layer 155.

[0075] In a transparent display panel 110 according to an example of the present disclosure, at least one of the first planarization layer 150 and the second planarization layer 155 is not provided in the transmissive region TA, thereby improving the light transmittance of the transmissive region TA.

[0076] The light-emitting device ED and the bank 160 may be provided on the second planarization layer 155. The light-emitting device ED may include a first electrode E1, a light-emitting layer EL, and a second electrode E2.

[0077] The first electrode E1 may be provided on the second planarization layer 155 and may be electrically connected to the driving transistor DT. Specifically, the first electrode E1 may be connected to the auxiliary electrode AE through a third contact hole CH3 penetrating the second planarization layer 155. Since the auxiliary electrode AE is connected to one of the source electrode SE and the drain electrode DE of the driving transistor DT through the second contact hole CH2, the first electrode E1 may be connected to one of the source electrode SE and the drain electrode DE of the driving transistor DT through the auxiliary electrode AE.

[0078] The first electrode E1 may be provided for each of the sub-pixels SP1, SP2, and SP3 and may not be provided in the transmission region TA. The bank 160 may be provided between the adjacent first electrodes E1, and thus the adjacent first electrodes E1 may be electrically insulated from each other.

[0079] The first electrode E1 may be formed of a high-reflection metal material such as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, a stacked structure of an Ag alloy and ITO (ITO / Ag alloy / ITO), a MoTi alloy, and a stacked structure of a MoTi alloy and ITO (ITO / MoTi alloy / ITO). The Ag alloy may be an alloy such as silver Ag, palladium Pd, copper Cu, etc. The MoTi alloy may be an alloy of molybdenum Mo and titanium Ti. The first electrode E1 may be an anode electrode.

[0080] The bank 160 may be provided on the second planarization layer 155. The bank 160 may be formed to cover the edge of the first electrode E1 and expose a part of the first electrode E1. Therefore, the bank 160 may prevent the problem of deterioration of the light emission efficiency due to current concentration at the end of the first electrode E1.

[0081] The bank 160 may define the emission regions EA1, EA2, and EA3 of each of the sub-pixels SP1, SP2, and SP3. The emission regions EA1, EA2, and EA3 of each of the sub-pixels SP1, SP2, and SP3 may indicate regions where holes from the first electrode E1 and electrons from the second electrode E2 are coupled to each other in the light-emitting layer EL to emit light. In this example, the region where the bank 160 is provided does not emit light and thus becomes a non-emission region NEA, and the region where the bank 160 is not provided and the first electrode E1 is exposed may be the emission regions EA1, EA2, and EA3.

[0082] As Figure 4As shown, the bank portion 160 may be provided in the non-transmissive region NTA and may not be provided in at least a part of the transmissive region TA. For example, the bank portion 160 may include a second opening region OA2 that overlaps at least a part of the transmissive region TA. For example, the second opening region OA2 of the bank portion 160 may be formed to have a size larger than the size of the transmissive region TA. In this example, the second opening region OA2 of the bank portion 160 may overlap all regions of the transmissive region TA. The second opening region OA2 of the bank portion 160 may be formed to have a size larger than the size of the first opening region OA1 of the second planarization layer 155. The second opening region OA2 of the bank portion 160 may overlap all regions of the first opening region OA1 of the second planarization layer 155.

[0083] The bank portion 160 may include a flat upper surface S2a and an inclined surface S2b exposed by the second opening region OA2. The upper surface S2a and the inclined surface S2b of the bank portion 160 may be provided in the non-transmissive region NTA.

[0084] The bank portion 160 may be formed of an organic layer such as an acrylic-based material, an epoxy-based material, a phenolic-based material, a polyamide-based material, and a polyimide-based material.

[0085] The light-emitting layer EL may be provided on the first electrode E1. The light-emitting layer EL may include an emission material layer EML containing a light-emitting material. The light-emitting material may include an organic material, an inorganic material, or a hybrid material. The light-emitting layer EL may have a multilayer structure. For example, the light-emitting layer EL may further include at least one of a hole injection layer HIL, a hole transport layer HTL, an electron transport layer ETL, and an electron injection layer EIL. In this example, when a voltage is applied to the first electrode E1 and the second electrode E2, holes and electrons move to the emission material layer EML through the hole transport layer HTL and the electron transport layer ETL, respectively, and combine with each other in the emission material layer EML to emit light.

[0086] In one or more embodiments, the light-emitting layer EL may be a common layer formed in common in the sub-pixels SP1, SP2, and SP3. In this example, the light-emitting layer EL may be a white light-emitting layer that emits white light. In this example, the light-emitting layer EL may be formed not only in the sub-pixels SP1, SP2, and SP3 but also in the non-emission region NEA between the sub-pixels SP1, SP2, and SP3. The light-emitting layer EL may be continuously formed between the sub-pixels SP1, SP2, and SP3. The light-emitting layer EL may be provided in the transmissive region TA and the non-transmissive region NTA including the emission regions EA1, EA2, and EA3 and the non-emission region NEA, but it is not limited thereto. The light-emitting layer EL may be patterned only in the non-transmissive region NTA including the emission regions EA1, EA2, and EA3 and the non-emission region NEA.

[0087] In another exemplary embodiment, the emission material layer EML of the light-emitting layer EL may be formed for each of the sub-pixels SP1, SP2, and SP3. For example, a green light-emitting layer that emits green light may be formed in the first sub-pixel SP1, a red light-emitting layer that emits red light may be formed in the second sub-pixel SP2, and a blue light-emitting layer that emits blue light may be formed in the third sub-pixel SP3. In this example, the emission material layer EML of the light-emitting layer EL cannot be formed in the transmissive region TA. However, in addition to the emission material layer EML, the hole injection layer HIL, the hole transport layer HTL, the electron transport layer ETL, and the electron injection layer EIL may be commonly formed in the sub-pixels SP1, SP2, and SP3, and may also be formed in the transmissive region TA.

[0088] The second electrode E2 may be disposed on the light-emitting layer EL. The second electrode E2 may be a common layer that is commonly formed in the sub-pixels SP1, SP2, and SP3. The second electrode E2 may be formed not only in the emission regions EA1, EA2, and EA3 of the sub-pixels SP1, SP2, and SP3, but also in the non-emission region NEA between the sub-pixels SP1, SP2, and SP3. The second electrode E2 may be continuously formed between the sub-pixels SP1, SP2, and SP3.

[0089] As Figure 4 shown, the second electrode E2 may be disposed in the non-transmissive region NTA and may not be disposed in at least a part of the transmissive region TA. For example, the second electrode E2 may include a third opening region OA3 that overlaps at least a part of the transmissive region TA.

[0090] The third opening region OA3 of the second electrode E2 may be formed to be larger than the transmissive region TA. In this example, the third opening region OA3 of the second electrode E2 may overlap all regions of the transmissive region TA. The third opening region OA3 of the second electrode E2 may be formed to be larger than the first opening region OA1 of the second planarization layer 155 and may overlap all regions of the first opening region OA1 of the second planarization layer 155. In this example, the third opening region OA3 of the second electrode E2 may also overlap the region where the inclined surface S1b of the second planarization layer 155 is provided.

[0091] The third opening region OA3 of the second electrode E2 may be formed to be larger than the second opening region OA2 of the bank 160 and may overlap all regions of the second opening region OA2 of the bank 160. In this example, the third opening region OA3 of the second electrode E2 may also overlap the region where the inclined surface S2b of the bank 160 is provided.

[0092] The second electrode E2 can be formed of a transparent metal material TCO (transparent conductive oxide) (such as ITO or IZO) capable of transmitting light or a semi-transmissive conductive material (such as magnesium Mg, silver Ag, or an alloy of magnesium Mg and silver Ag). When the second electrode E2 is formed of a semi-transmissive conductive material, the light emission efficiency can be increased due to the microcavity. The second electrode E2 can be a cathode electrode.

[0093] The organic pattern layer 165 can be disposed in the transmissive region TA. At least a part of the organic pattern layer 165 and the second electrode E2 can be disposed on the same layer and can be disposed in the third opening region OA3 of the second electrode E2. The edge of the organic pattern layer 165 can be in contact with the second electrode E2 within the third opening region OA3 of the second electrode E2. The organic pattern layer 165 can be in contact with the second electrode E2 along its side surface.

[0094] Due to the characteristics of the material, the second electrode E2 cannot be deposited on the organic pattern layer 165. For example, the organic pattern layer 165 does not overlap with the second electrode E2. Specifically, the second electrode E2 can include a first material having conductivity. The organic pattern layer 165 can include a second material from which the first material desorbs. The second material forming the organic pattern layer 165 can be an organic material having a low surface energy of the material itself or a high interfacial energy between metal materials. Due to the desorption of the metal material on the surface during the deposition of the metal material, the second material having such characteristics has a low deposition rate of the metal material.

[0095] The second material forming the organic pattern layer 165 can have a high light transmittance. As Figure 8 shown, the second material forming the organic pattern layer 165 can have a high light transmittance in the visible light band. For example, the organic pattern layer 165 can have a higher light transmittance than the light transmittance of the second electrode E2.

[0096] The transparent display panel 110 according to an exemplary embodiment of the present disclosure can selectively pattern the second electrode E2 by utilizing the characteristics of the second material forming the organic pattern layer 165.

[0097] First, as Figure 6 shown, a mask having an opening region corresponding to the transmissive region TA can be disposed on the first substrate 111. By depositing the second material forming the organic pattern layer 165 on the first substrate 111 on which the mask is disposed, the organic pattern layer 165 can be patterned in the transmissive region TA.

[0098] Next, as Figure 7As shown, after removing the mask, the first material E2a for forming the second electrode E2 can be completely deposited. In this example, the first material E2a can be deposited in the area where the organic pattern layer 165 is not provided to form the second electrode E2. On the other hand, the first material E2a can be desorbed and cannot be deposited in the area where the organic pattern layer 165 is provided. Therefore, the second electrode E2 cannot be formed in the area where the organic pattern layer 165 is provided, and thus the third opening area OA3 can be formed. The second electrode E2 can contact the edge of the organic pattern layer 165 in the third opening area OA3.

[0099] As Figure 5 shown, the organic pattern layer 165 can contact the second electrode E2 in the non-transmissive area NTA. The boundary BD between the second electrode E2 and the organic pattern layer 165 can be set in the non-transmissive area NTA. The boundary BD between the second electrode E2 and the organic pattern layer 165 can be set along the edge of the non-transmissive area NTA in the non-transmissive area NTA.

[0100] Specifically, the boundary BD between the second electrode E2 and the organic pattern layer 165 can be set on the upper surface S1a of the second planarization layer 155 and the flat upper surface S2a of the embankment 160.

[0101] For example, as Figure 4 shown, the boundary BD between the second electrode E2 and the organic pattern layer 165 can be set on the flat upper surface S2a of the embankment 160. For example, the end of the second electrode E2 and the end of the organic pattern layer 165 can contact at least a part of the upper surface S2a of the embankment 160.

[0102] The boundary BD between the second electrode E2 and the organic pattern layer 165 can be set in the non-emitting area NEA including the embankment 160. The end of the second electrode E2 and the end of the organic pattern layer 165 can be set on the flat surface such as the upper surface S1a of the second planarization layer 155 and the upper surface S2a of the embankment 160.

[0103] Since the second electrode E2 and the organic pattern layer 165 are made of different materials, light can be refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165 and change its propagation direction. In addition, when there is a step difference between the second electrode E2 and the organic pattern layer 165 made of different materials, the fluctuation of light along the step difference plane can be further increased.

[0104] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since the boundary BD between the second electrode E2 and the organic pattern layer 165 can be set in the non-emission area NEA, light emitted from the light-emitting layer EL of the light-emitting device ED or light incident from the outside can be prevented from being refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165. Therefore, the transparent display panel 110 according to an exemplary embodiment of the present disclosure can prevent the occurrence of light leakage phenomena in which light emitted from the light-emitting layer EL of the light-emitting device ED is emitted to the transmissive area TA or other sub-pixel areas.

[0105] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the end of the second electrode E2 and the end of the organic pattern layer 165 can be disposed on a flat surface. In the process of depositing materials to form a pattern, the materials can be deposited on the flat surface rather than on an inclined surface to have a constant thickness. The materials cannot be formed with a constant thickness on the inclined surface and can be deposited thinner than on the flat surface. In particular, when the end of the pattern is formed on the inclined surface, the thickness of the end of the pattern can be formed with a non-constant thickness. Therefore, in this process, it is not easy to control the thickness of the materials on the inclined surface.

[0106] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the end of the organic pattern layer 165 can be formed on a flat surface, such as the upper surface S2a of the bank 160, so that the end of the organic pattern layer 165 can have a desired thickness.

[0107] In an exemplary embodiment, the organic pattern layer 165 and the second electrode E2 can have the same thickness on the upper surface S2a of the bank 160. The surface S3 of the second electrode E2 and the upper surface S4 of the organic pattern layer 165 can be formed at the same height. Since there is no step difference between the upper surface S3 of the second electrode E2 and the upper surface S4 of the organic pattern layer 165, the second electrode E2 and the organic pattern layer 165 can have a flat surface at the boundary BD. For example, a flat surface FS including the upper surface S3 of the second electrode E2 and the upper surface S4 of the organic pattern layer 165 can be provided.

[0108] Therefore, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since there is no step difference at the boundary BD between the second electrode E2 and the organic pattern layer 165, light emitted from the light-emitting layer EL of the light-emitting device ED or light incident from the outside can be prevented from being refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165.

[0109] On the other hand, the boundary BD between the second electrode E2 and the organic pattern layer 165 is not provided on the inclined surface S1b of the second planarization layer 155 and the inclined surface S2b of the bank portion 160. In other words, in the plan view, the boundary BD between the second electrode E2 and the organic pattern layer 165 can be spaced apart from the inclined surface S1b of the second planarization layer 155. In addition, in the plan view, the boundary BD between the second electrode E2 and the organic pattern layer 165 can be spaced apart from the inclined surface S2b of the bank portion 160.

[0110] When the material for forming the organic pattern layer 165 is deposited such that the end of the organic pattern layer 165 is formed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank portion 160, the material for forming the organic pattern layer 165 cannot have a designed thickness on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank portion 160 and can be formed thinner.

[0111] Then, when the material for forming the second electrode E2 is deposited, the second electrode E2 can be deposited in the region where the organic pattern layer 165 is not formed. In this case, the end of the second electrode E2 is formed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank portion 160, and the end of the second electrode E2 also cannot have a designed thickness. In this way, the end of each of the organic pattern layer 165 and the second electrode E2 does not have a designed thickness and can be deposited to have different thicknesses. In this case, a step difference may occur at the boundary BD where the end of the organic pattern layer 165 contacts the end of the second electrode E2. Therefore, the propagation direction of the light incident from the outside may be greatly changed at the boundary BD between the second electrode E2 and the organic pattern layer 165.

[0112] In particular, since the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank portion 160 provides a channel through which the external light incident on the transmissive region TA passes, a large amount of external light can be incident. When the external light is refracted or reflected at the boundary BD between the organic pattern layer 165 and the second electrode E2 provided on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank portion 160, the object located on the rear surface of the transparent display panel 110 may be distorted or blurred, which may cause unevenness.

[0113] To prevent this, the transparent display panel 110 according to an exemplary embodiment of the present disclosure can be designed such that the boundary BD between the second electrode E2 and the organic pattern layer 165 is not provided on the inclined surface S1b of the second planarization layer 155 and the inclined surface S2b of the bank portion 160.

[0114] The encapsulation layer 180 may be disposed on the light-emitting device ED and the organic pattern layer 165. The encapsulation layer 180 may be formed on the second electrode E2 and the organic pattern layer 165 to cover the second electrode E2 and the organic pattern layer 165. The encapsulation layer 180 is used to prevent oxygen or moisture from penetrating into the light-emitting layer EL, the second electrode E2, and the organic pattern layer 165. To this end, the encapsulation layer 180 may include at least one inorganic layer and at least one organic layer. The encapsulation layer 180 may have a structure in which inorganic layers and organic layers are alternately stacked, but it is not limited thereto.

[0115] For example, as Figure 9 and Figure 10 shown, the encapsulation layer 180 may have a structure in which a first inorganic layer 181, an organic layer 182, and a second inorganic layer 183 are stacked. The first inorganic layer 181 may be formed to cover the second electrode E2 and the organic pattern layer 165. The organic layer 182 may be formed on the first inorganic layer 181 to have a sufficient thickness to prevent particles from penetrating the first inorganic layer 181 and entering the light-emitting layer EL, the second electrode E2, and the organic pattern layer 165. The second inorganic layer 183 may be formed to cover the organic layer 182.

[0116] A cover layer 170 may be further disposed between the encapsulation layer 180 and the light-emitting device ED and between the encapsulation layer 180 and the organic pattern layer 165. The cover layer 170 may be disposed to cover the second electrode E2 on the second electrode E2, thereby improving the viewing angle characteristics and increasing the external light emission efficiency. The cover layer 170 may include at least one of an inorganic layer and an organic layer having light transmissivity, and may have a single-layer structure or a multi-layer structure. The cover layer 170 may have a structure in which a first inorganic layer 171 and a second inorganic layer 172 are stacked.

[0117] A color filter CF may be disposed on the encapsulation layer 180. The color filter CF may be patterned for each of the sub-pixels SP1, SP2, and SP3. Specifically, the color filter CF may include a first color filter, a second color filter, and a third color filter. The first color filter may be disposed to correspond to the emission region EA1 of the first sub-pixel SP1, and may be a green color filter that transmits green light. The second color filter may be disposed to correspond to the emission region EA2 of the second sub-pixel SP2, and may be a red color filter that transmits red light. The third color filter may be disposed to correspond to the emission region EA3 of the third sub-pixel SP3, and may be a blue color filter that transmits blue light.

[0118] A transparent display panel 110 according to an exemplary embodiment of the present disclosure may include a color filter CF without using a polarizing plate. When a polarizing plate is attached to the transparent display panel 110, the transmittance of the transparent display panel 110 may be reduced due to the polarizing plate. On the other hand, when the polarizing plate is not attached to the transparent display panel 110, there may be a problem that light incident from the outside is reflected by the electrode.

[0119] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since the polarizing plate is not attached, a reduction in transmittance can be prevented. In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since the color filter CF is formed, the color filter CF can absorb a part of the light incident from the outside, so that the light incident from the outside can be prevented from being reflected by the electrode. For example, the transparent display panel 110 according to an exemplary embodiment of the present disclosure can reduce the external light reflectance without reducing the transmittance.

[0120] A black matrix BM may be provided between the color filters CF patterned for each of the sub-pixels SP1, SP2, and SP3. The black matrix BM may be provided between the sub-pixels SP1, SP2, and SP3 to prevent color mixing between adjacent sub-pixels SP1, SP2, and SP3. In addition, the black matrix BM may prevent light incident from the outside from being reflected by a plurality of signal lines provided between the sub-pixels SP1, SP2, and SP3.

[0121] The black matrix BM may be provided between the transmissive region TA and the plurality of sub-pixels SP1, SP2, and SP3, and may prevent light emitted from each of the plurality of sub-pixels SP1, SP2, and SP3 from propagating to the transmissive region TA. Therefore, the black matrix BM may define a boundary between the transmissive region TA and the non-transmissive region NTA. Specifically, the black matrix BM may define a boundary between the non-transmissive region NTA and the transmissive region TA between the emission region EA and the transmissive region TA. In this example, in a region other than the emission region EA, the region where the black matrix BM is provided may be the non-transmissive region NTA, and the region where the black matrix BM is not provided may be the transmissive region TA. For example, the region where the emission region EA and the black matrix BM are provided may be the non-transmissive region NTA, and the remaining region may be the transmissive region TA.

[0122] The black matrix BM may be provided to cover the region where the bank 160 is provided. The black matrix BM may be provided to cover not only the upper surface S2a of the bank 160 but also the inclined surface S2b of the bank 160. In addition, the black matrix BM may be provided to cover the inclined surface S1b of the second planarization layer 155.

[0123] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the boundary BD between the second electrode E2 and the organic pattern layer 165 may be set to overlap with the black matrix BM. Specifically, the boundary BD between the second electrode E2 and the organic pattern layer 165 may be set to overlap with the black matrix BM disposed between the pixel P and the transmissive region TA. Thus, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, even if the light emitted from the light-emitting layer EL of the light-emitting device ED or the light incident from the outside is refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165, the refracted or reflected light can be absorbed by the black matrix BM. The transparent display panel 110 according to an exemplary embodiment of the present disclosure can prevent the light emitted from the light-emitting layer EL of the light-emitting device ED from being emitted to the transmissive region TA or another sub-pixel region.

[0124] The black matrix BM may include a light-absorbing material, such as a black dye that absorbs all light in the visible band.

[0125] The color filter CF and the black matrix BM are not provided in the transmissive region TA to maintain a high light transmittance in the transmissive region TA.

[0126] The color filter CF and the black matrix BM may be directly formed on the first substrate 111 having the encapsulation layer 180. For example, the color filter CF and the black matrix BM may be formed in contact with the upper surface of the encapsulation layer 180. In another example, when an additional layer is further provided on the encapsulation layer 180, the color filter CF and the black matrix BM may be directly formed on the additional layer provided on the encapsulation layer 180.

[0127] When the color filter CF and the black matrix BM are directly formed on the first substrate 111 having the encapsulation layer 180, the processing error can be reduced. When the color filter CF and the black matrix BM are formed on the second substrate 112 and bonded to the first substrate 111 having the encapsulation layer 180, a relatively large error may occur during the bonding, and in this case, the color filter CF and the black matrix BM cannot be disposed at the desired positions.

[0128] Therefore, the boundary BD between the second electrode E2 and the organic pattern layer 165 should not overlap with the black matrix BM. In this case, when the boundary BD between the second electrode E2 and the organic pattern layer 165 is set to overlap with the color filter CF, the light emitted from the light-emitting layer EL may be refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165, thereby reducing the light efficiency, or may move to an adjacent sub-pixel region, thereby causing a light leakage phenomenon. Alternatively, when the boundary BD between the second electrode E2 and the organic pattern layer 165 is set to overlap with the transmissive region TA, the light incident from the outside may be refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165, thereby distorting the object or causing a non-uniformity phenomenon.

[0129] To ensure that the boundary BD between the second electrode E2 and the organic pattern layer 165 overlaps with the black matrix BM, considering the bonding margin between the first substrate 111 and the second substrate 112, the area of the black matrix BM can be formed to be larger. However, when the area of the black matrix BM increases, the area of the non-transmissive region NTA increases, and thus the area of the transmissive region TA decreases. Therefore, the light transmittance of the transparent display panel 110 may be reduced.

[0130] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the color filter CF and the black matrix BM are directly formed on the first substrate 111 having the encapsulation layer 180, thereby reducing possible processing errors and allowing the color filter CF and the black matrix BM to be disposed in desired regions. Therefore, the transparent display panel 110 according to an exemplary embodiment of the present disclosure can ensure that the boundary BD between the second electrode E2 and the organic pattern layer 165 overlaps with the black matrix BM without increasing the area of the black matrix BM.

[0131] The first substrate 111 including the color filter CF and the black matrix BM can be bonded to the second substrate 112 through a separate adhesive layer 190. In this example, the adhesive layer 190 may be an optically clear resin layer OCR or an optically clear adhesive film OCA.

[0132] In the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the second electrode E2 is not disposed in the transmissive region TA, thereby increasing the light transmittance of the transmissive region TA.

[0133] In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the organic pattern layer 165 may be disposed in the transmissive region TA, and the second electrode E2 may be patterned so as not to be deposited in the transmissive region TA by utilizing the characteristics of the material forming the organic pattern layer 165. The transparent display panel 110 according to an exemplary embodiment of the present disclosure can pattern the second electrode E2 through a simple process.

[0134] In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since the boundary BD between the second electrode E2 and the organic pattern layer 165 can be disposed in the non-emission area NEA, light emitted from the light-emitting layer EL of the light-emitting device ED can be prevented from being refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165. Accordingly, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, a light leakage phenomenon in which light emitted from the light-emitting layer EL of the light-emitting device ED is emitted to the transmission area TA or another sub-pixel area can be prevented.

[0135] In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since the end of the organic pattern layer 165 is formed on a flat surface, a step difference does not occur at the boundary BD between the second electrode E2 and the organic pattern layer 165. Accordingly, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, light emitted from the light-emitting layer EL of the light-emitting device ED or light incident from the outside can be prevented from being greatly refracted or reflected along the step difference plane at the boundary BD between the second electrode E2 and the organic pattern layer 165.

[0136] In addition, since the boundary BD between the second electrode E2 and the organic pattern layer 165 is not disposed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160, an uneven phenomenon in which an object located on the rear surface of the transparent display panel 110 is distorted or blurred can be prevented.

[0137] In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since the boundary BD between the second electrode E2 and the organic pattern layer 165 is disposed to overlap the black matrix BM, even if a part of the light emitted from the light-emitting layer EL of the light-emitting device ED or a part of the light incident from the outside is refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165, the refracted or reflected light can be absorbed in the black matrix BM. Accordingly, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, light emitted from the light-emitting layer EL of the light-emitting device ED can be prevented from being emitted to the transmission area TA or another sub-pixel area.

[0138] In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, since non-uniformity defects and light leakage defects do not occur, the defect rate of the product can be reduced, the manufacturing processing cost can be reduced, the manufacturing processing time can be shortened, and the production energy consumption can be reduced. In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the generation of greenhouse gases caused by the manufacturing process can be reduced, thereby achieving ESG (environment / society / governance).

[0139] In addition, in the transparent display panel 110 according to an exemplary embodiment of the present disclosure, the color filter CF and the black matrix BM are directly formed on the first substrate 111 having the encapsulation layer 180, thereby reducing possible processing errors and ensuring that the boundary BD between the second electrode E2 and the organic pattern layer 165 overlaps with the black matrix BM without increasing the area of the black matrix BM.

[0140] Figure 11 is a cross-section showing another example taken along the Figure 2 line I-I' shown, and Figure 12 is a plan view showing another example of the second electrode and the organic pattern layer of the light-emitting device according to an aspect of the present disclosure.

[0141] Referring to Figure 11 and Figure 12 , the transparent display panel 110 according to another embodiment of the present disclosure may include a first substrate 111 and a second substrate 112 facing each other. Circuit elements, a light-emitting device ED, an organic pattern layer 165, an encapsulation layer 180, a color filter CF, and a black matrix BM may be disposed between the first substrate 111 and the second substrate 112.

[0142] Except for the second electrode E2 and the organic pattern layer 165 of the light-emitting device ED, Figure 11 and Figure 12 the transparent display panel 110 shown is Figures 4 to 10 substantially the same as the transparent display panel 110 shown. Hereinafter, the second electrode E2 and the organic pattern layer 165 of the light-emitting device ED will be mainly described with respect to the differences, and the description of the substantially identical components will be omitted.

[0143] As Figure 11 shown, the second electrode E2 of the light-emitting device ED may be disposed in at least a part of the non-transmissive region NTA and the transmissive region TA, and may not be disposed in another part of the transmissive region TA. For example, the second electrode E2 may include a third opening region OA3 overlapping at least a part of the transmissive region TA.

[0144] The third opening region OA3 of the second electrode E2 may be formed to be smaller than the transmissive region TA. Further, the third opening region OA3 of the second electrode E2 may be formed to be smaller than the first opening region OA1 of the second planarization layer 155. In this example, the second electrode E2 may overlap with the region of the inclined surface S1b on which the second planarization layer 155 is provided.

[0145] The third opening region OA3 of the second electrode E2 may be formed to be smaller than the second opening region OA2 of the bank 160. In this example, the second electrode E2 may overlap with the region of the inclined surface S2b on which the bank 160 is provided.

[0146] The second electrode E2 may be formed of a transparent metal material TCO (such as ITO or IZO) capable of transmitting light or a semi-transmissive conductive material (such as magnesium Mg, silver Ag, or an alloy of magnesium Mg and silver Ag). When the second electrode E2 is formed of a semi-transmissive conductive material, the light emission efficiency may be increased due to the microcavity.

[0147] The organic pattern layer 165 may be provided in at least a part of the transmissive region TA. The organic pattern layer 165 may be provided on the same layer as the second electrode E2 and may be provided in the third opening region OA3 of the second electrode E2. The edge of the organic pattern layer 165 may contact the second electrode E2 within the third opening region OA3 of the second electrode E2. The organic pattern layer 165 may contact the second electrode E2 along its side surface.

[0148] Due to the characteristics of the material, the second electrode E2 cannot be deposited on the organic pattern layer 165. For example, the organic pattern layer 165 does not overlap with the second electrode E2. Specifically, the second electrode E2 may include a first material having conductivity. The organic pattern layer 165 may include a second material from which the first material desorbs. The second material forming the organic pattern layer 165 may be an organic material having a low surface energy of the material itself or a high interfacial energy between metal materials. Due to the desorption of the metal material on the surface during the deposition of the metal material, the second material having such characteristics has a low deposition rate of the metal material.

[0149] The second material forming the organic pattern layer 165 may have a high light transmittance. The second material forming the organic pattern layer 165 may have a high light transmittance in the visible light band.

[0150] The transparent display panel 110 according to an exemplary embodiment of the present disclosure may selectively pattern the second electrode E2 by utilizing the characteristics of the second material forming the organic pattern layer 165.

[0151] As Figure 12As shown, the organic pattern layer 165 may be in contact with the second electrode E2 in the transmissive region TA. The boundary BD between the second electrode E2 and the organic pattern layer 165 may be set in the transmissive region TA. The boundary BD between the second electrode E2 and the organic pattern layer 165 may be provided along the edge of the transmissive region TA in the transmissive region TA.

[0152] Specifically, the boundary BD between the second electrode E2 and the organic pattern layer 165 may be provided on the upper surface S5 of the first planarization layer 150. The upper surface S5 of the first planarization layer 150 may be exposed in the first opening region OA1 of the second planarization layer 155. The boundary BD between the second electrode E2 and the organic pattern layer 165 may be directly formed on the exposed upper surface S5 of the first planarization layer 150. For example, the end of the second electrode E2 and the end of the organic pattern layer 165 may be in contact with at least a portion of the upper surface S5 of the first planarization layer 150.

[0153] The boundary BD between the second electrode E2 and the organic pattern layer 165 may be formed on a flat surface such as the upper surface S5 of the first planarization layer 150.

[0154] Since the second electrode E2 and the organic pattern layer 165 are made of different materials, light may be refracted or reflected at the boundary BD between the second electrode E2 and the organic pattern layer 165, and its propagation direction may be changed. In addition, when a step difference occurs between the second electrode E2 and the organic pattern layer 165 made of different materials, the fluctuation of light along the step difference plane may be further increased.

[0155] In the transparent display panel 110 according to another exemplary embodiment of the present disclosure, the end of the second electrode E2 and the end of the organic pattern layer 165 may be provided on a flat surface. In the process of depositing materials to form a pattern, the materials may be deposited on the flat surface rather than on the inclined surface to have a constant thickness. The materials cannot be formed with a constant thickness on the inclined surface and may be deposited thinner than on the flat surface. In particular, when the end of the pattern is formed on the inclined surface, the thickness of the end of the pattern may be formed with a non-constant thickness. Therefore, in this process, it is not easy to control the thickness of the materials on the inclined surface.

[0156] In the transparent display panel 110 according to another exemplary embodiment of the present disclosure, the end of the organic pattern layer 165 may be formed on a flat surface such as the upper surface S5 of the first planarization layer 150 so that the end of the organic pattern layer 165 may have a desired thickness.

[0157] In an exemplary embodiment, the organic pattern layer 165 and the second electrode E2 may have the same thickness on the upper surface S5 of the first planarization layer 150. The upper surface S3 of the second electrode E2 and the upper surface S4 of the organic pattern layer 165 may be formed at the same height. Since there is no step difference between the upper surface S3 of the second electrode E2 and the upper surface S4 of the organic pattern layer 165, the second electrode E2 and the organic pattern layer 165 may have a flat surface at the boundary BD. For example, a flat surface FS including the upper surface S3 of the second electrode E2 and the upper surface S4 of the organic pattern layer 165 may be provided.

[0158] Accordingly, in the transparent display panel 110 according to another exemplary embodiment of the present disclosure, since there is no step difference at the boundary BD between the second electrode E2 and the organic pattern layer 165, the refraction or reflection of light incident from the outside at the boundary BD between the second electrode E2 and the organic pattern layer 165 can be minimized.

[0159] On the other hand, the boundary BD between the second electrode E2 and the organic pattern layer 165 is not provided on the inclined surface S1b of the second planarization layer 155 and the inclined surface S2b of the bank 160. In other words, in a plan view, the boundary BD between the second electrode E2 and the organic pattern layer 165 may be spaced apart from the inclined surface S1b of the second planarization layer 155. Further, in a plan view, the boundary BD between the second electrode E2 and the organic pattern layer 165 may be spaced apart from the inclined surface S2b of the bank 160.

[0160] When the material for forming the organic pattern layer 165 is deposited such that the end of the organic pattern layer 165 is formed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160, the material for forming the organic pattern layer 165 cannot have a designed thickness on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160 and may be formed thinner.

[0161] Then, when the material for forming the second electrode E2 is deposited, the second electrode E2 may be deposited in an area where the organic pattern layer 165 is not formed. In this case, the end of the second electrode E2 is formed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160, and the end of the second electrode E2 also cannot have a designed thickness. In this way, the end of each of the organic pattern layer 165 and the second electrode E2 does not have a designed thickness and may be deposited to have different thicknesses. In this case, a step difference may occur at the boundary BD where the end of the organic pattern layer 165 contacts the end of the second electrode E2, and thus, the propagation direction of light incident from the outside may be greatly changed at the boundary BD between the second electrode E2 and the organic pattern layer 165.

[0162] In particular, since the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160 provides a passage through which external light incident on the transmissive region TA can pass, a large amount of external light can be incident. When the external light is refracted or reflected at the boundary BD between the organic pattern layer 165 disposed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160 and the second electrode E2, an object located on the rear surface of the transparent display panel 110 may be distorted or blurred, which may cause unevenness.

[0163] To prevent this, the transparent display panel 110 according to another exemplary embodiment of the present disclosure can be designed such that the boundary BD between the second electrode E2 and the organic pattern layer 165 is not provided on the inclined surface S1b of the second planarization layer 155 and the inclined surface S2b of the bank 160, but can be provided on a flat surface.

[0164] In the transparent display panel 110 according to another exemplary embodiment of the present disclosure, it is possible to prevent the end portion of the organic pattern layer 165 from being disposed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160 due to a processing error. The upper surface S2a of the bank 160 disposed between the pixel P and the transmissive region TA may have a small width. Even if the end portion of the organic pattern layer 165 is designed to be disposed on the upper surface S2a of the bank 160, the end portion of the organic pattern layer 165 may be disposed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160 due to a processing error. Alternatively, the end portion of the organic pattern layer 165 may be disposed in the emission regions EA1, EA2, and EA3.

[0165] In the transparent display panel 110 according to another exemplary embodiment of the present disclosure, the end portion of the organic pattern layer 165 can be disposed on a flat surface provided in the transmissive region TA, thereby ensuring that the end portion of the organic pattern layer 165 is not disposed on the inclined surface S1b of the second planarization layer 155 or the inclined surface S2b of the bank 160 even if a processing error occurs.

[0166] In the present disclosure, an organic pattern layer can be used to selectively pattern the second electrode in the non-transmissive region, and the second electrode cannot be formed in the transmissive region, thereby increasing the light transmittance of the transmissive region.

[0167] Furthermore, in the present disclosure, since the boundary between the second electrode and the organic pattern layer can be provided in the non-transmissive region, it is possible to prevent the light emitted from the light-emitting layer from being refracted or reflected at the boundary between the second electrode and the organic pattern layer, thereby preventing light leakage phenomena in which the light emitted from the light-emitting layer is emitted to the transmissive region or other sub-pixel regions.

[0168] In addition, in the present disclosure, the boundary between the second electrode and the organic pattern layer may be set to overlap with the black matrix, so that even if a part of the light emitted from the light-emitting layer or a part of the light incident from the outside is refracted or reflected at the boundary between the second electrode and the organic pattern layer, the refracted or reflected light can be absorbed by the black matrix, and thus light leakage does not occur.

[0169] In addition, in the present disclosure, since the end portion of the organic pattern layer can be formed on a flat surface, there is no step difference at the boundary between the second electrode and the organic pattern layer. Therefore, in the present disclosure, it is possible to prevent the light emitted from the light-emitting layer of the light-emitting device or the light incident from the outside from being greatly refracted or reflected along the stepped plane.

[0170] In addition, in the present disclosure, the boundary between the second electrode and the organic pattern layer cannot be set on the inclined surface of the second planarization layer or the inclined surface of the bank, thereby preventing the occurrence of unevenness in which an object located on the rear surface of the transparent display panel is distorted or blurred.

[0171] In addition, in the present disclosure, by directly disposing the color filter and the black matrix on the first substrate having the encapsulation layer, the processing error can be reduced, and it is ensured that the boundary between the second electrode and the organic pattern layer overlaps with the black matrix without increasing the area of the black matrix.

[0172] In addition, in the present disclosure, since unevenness defects and light leakage defects do not occur, the defect rate of the product can be reduced, the manufacturing processing cost can be reduced, the manufacturing processing time can be shortened, and the production energy consumption can be reduced. In addition, in the present disclosure, the generation of greenhouse gases due to the manufacturing process can be reduced, thereby achieving ESG (environment / society / governance).

[0173] The above-described features, structures, and effects of the present disclosure are included in at least one embodiment of the present disclosure, but are not limited to one embodiment. In addition, those skilled in the art can achieve the features, structures, and effects described in at least one embodiment of the present disclosure through combinations or modifications of other embodiments. Therefore, the content associated with the combinations and modifications should be construed as being within the scope of the present disclosure.

[0174] It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure.

[0175] The above-described various embodiments can be combined to provide further embodiments.

[0176] These and other changes may be made to the embodiments in light of the above detailed description. Generally, the terms used in the claims should not be construed to limit the claims to the specific embodiments disclosed in the present disclosure and the claims, but should be construed to include all possible embodiments and the full scope of equivalents to such claims. Accordingly, the claims are not limited by the present disclosure.

Claims

1. A transparent display device, comprising: a first substrate including a transmission area configured to transmit external light and a non-transmission area configured not to transmit external light; a light emitting device disposed in the non-transmitting region on the first substrate to emit light; as well as an organic pattern layer, wherein the organic pattern layer is disposed in the transmission area on the first substrate, Wherein, the light emitting device comprises: a first electrode disposed in the emitting region; a light-emitting layer disposed on the first electrode; and a second electrode disposed on the light-emitting layer, and The second electrode is disposed in a region where the organic pattern layer is not disposed, and the second electrode contacts an edge of the organic pattern layer.

2. The transparent display device according to claim 1, wherein: A boundary between the second electrode and the organic pattern layer is disposed in the non-transmission region.

3. The transparent display device according to claim 1, further comprising: A color filter disposed on the light emitting device; as well as a black matrix disposed between the color filter and the transmission area, Wherein, a boundary between the second electrode and the organic pattern layer overlaps with the black matrix.

4. The transparent display device according to claim 1, further comprising: A circuit element, wherein the circuit element is disposed between the first substrate and the light emitting device; as well as a planarization layer provided between the circuit element and the light emitting device to planarize a step difference caused by the circuit element, Wherein, the planarization layer includes a first opening area overlapping with the transmission area.

5. The transparent display device according to claim 4, wherein: The planarization layer includes an inclined surface and an upper surface exposed in the first opening region, and Wherein, the inclined surface of the planarization layer is arranged in the non-transmission area.

6. The transparent display device according to claim 5, wherein: A boundary between the second electrode and the organic pattern layer is spaced apart from the inclined surface of the planarization layer.

7. The transparent display device according to claim 5, wherein: The boundary between the second electrode and the organic pattern layer is disposed on the upper surface of the planarization layer.

8. The transparent display device according to claim 5, wherein: A boundary between the second electrode and the organic pattern layer is disposed in the first opening region.

9. The transparent display device according to claim 4, wherein: The planarization layer includes a first planarization layer and a second planarization layer disposed on the first planarization layer, and Wherein, the first opening area is arranged in the second planarization layer.

10. The transparent display device according to claim 1, further comprising a bank disposed between the first electrode and the transmission area, in, The bank includes a second opening area overlapping the transmission area, wherein the bank further comprises an inclined surface and an upper surface exposed in the second opening region, and Wherein, the inclined surface of the bank is arranged in the non-transmitting area.

11. The transparent display device according to claim 10, wherein: A boundary between the second electrode and the organic pattern layer is spaced apart from the inclined surface of the bank.

12. The transparent display device according to claim 10, wherein: A boundary between the second electrode and the organic pattern layer is disposed on an upper surface of the bank.

13. The transparent display device according to claim 1, wherein: Both the second electrode and the organic pattern layer have flat surfaces at a boundary between the second electrode and the organic pattern layer.

14. The transparent display device according to claim 1, further comprising: An encapsulation layer arranged to cover the light-emitting device on the light-emitting device; a color filter arranged to correspond to the light emitting device and arranged on the encapsulation layer; A black matrix disposed between the color filter and the transmission area; an adhesive layer disposed on the color filter and the black matrix; as well as A second substrate is bonded to the color filter and the black matrix through the adhesive layer.

15. The transparent display device according to claim 1, wherein: The organic pattern layer includes a second material, and the first material forming the second electrode is desorbed from the second material.

16. A transparent display device, comprising: a transmission area configured to transmit external light; an emission region configured to emit light; a light emitting device, the light emitting device being disposed in the emission region and comprising a first electrode, a light emitting layer, and a second electrode; an organic pattern layer, wherein at least a portion of the organic pattern layer and the second electrode of the light-emitting device are disposed on the same layer; and a black matrix, the black matrix being arranged to correspond to the light emitting device in the emission area, The second electrode includes an opening area, the opening area overlaps with at least a portion of the transmission area and at least a portion of the area where the black matrix is ​​disposed, and Wherein, the organic pattern layer is arranged in the opening region of the second electrode.

17. The transparent display device according to claim 16, wherein: The organic pattern layer contacts the second electrode along a side surface of the organic pattern layer.

18. The transparent display device according to claim 16, wherein: At least a portion of the organic pattern layer overlaps with the black matrix.

19. The transparent display device according to claim 16, wherein: An upper surface of the second electrode has the same height as an upper surface of the organic pattern layer.

20. The transparent display device according to claim 16, wherein: The second electrode has the same thickness as the organic pattern layer.

21. The transparent display device according to claim 16, wherein: The second electrode includes a first material having conductivity, and The organic pattern layer includes a second material, and the first material is desorbed from the second material.

22. The transparent display device according to claim 16, further comprising a planarization layer disposed below the light emitting device in the emission area, in, The planarization layer includes an upper surface and an inclined surface disposed between the upper surface and the transmission area, and The opening area of ​​the second electrode overlaps with the area where the inclined surface of the planarization layer is provided.

23. The transparent display device according to claim 22, further comprising a bank disposed between the first electrode and the transmission area, in, The bank includes an upper surface and an inclined surface disposed between the upper surface and the transmission area, and The opening area of ​​the second electrode overlaps with the area where the inclined surface of the bank is provided.

24. The transparent display device according to claim 23, wherein: An end portion of the organic pattern layer is disposed on an upper surface of the bank.

25. The transparent display device according to claim 22, wherein: The boundary between the second electrode and the organic pattern layer is disposed in a first opening region of the planarization layer, and the first opening region overlaps the transmission region.

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