Electroluminescent display device

Abstract

An electroluminescent display device includes a substrate having a display area and a non-display area outside the display area; a first electrode provided in each of a plurality of sub-pixels in the display area of the substrate; a connection electrode provided in the non-display area of the substrate; a bank covering both ends of the first electrode and a top surface of the connection electrode; a light-emitting layer provided on the first electrode and the bank in the display area and the non-display area; and a second electrode provided on the light-emitting layer, wherein a groove is provided in the bank of the non-display area, one side surface of the connection electrode is exposed to an inside of the groove, and the second electrode extends into the inside of the groove and is in contact with the one side surface of the connection electrode.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2020-0188993, filed on December 31, 2020, which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to an electroluminescent display device. Background Technology

[0004] An electroluminescent display device is a device that displays an image by placing a light-emitting layer between two electrodes (i.e., an anode electrode and a cathode electrode) and emitting light using the electric field generated between the two electrodes.

[0005] The luminescent layer can be formed from organic or inorganic materials (such as quantum dots). In the luminescent layer, excitons are generated through the combination of electrons and holes, and light is emitted when the excitons transition from the excited state to the ground state.

[0006] The emissive layer can emit light of different colors (e.g., red, green, and blue) in subpixels, and can also emit light of the same color (e.g., white) in subpixels.

[0007] If the same white light-emitting layer is used, then it is not necessary to pattern the light-emitting layer in each sub-pixel. However, when the light-emitting layer is formed in all non-display areas, it becomes difficult to perform the process of connecting the cathode electrode formed on the light-emitting layer to the circuit formed below the light-emitting layer. Therefore, the light-emitting layer is deposited while some areas of the non-display area are covered by a mask.

[0008] However, in this case, the particles remaining in the mask can penetrate into the light-emitting layer, thereby causing a decrease in light-emitting properties. Summary of the Invention

[0009] Accordingly, this disclosure aims to provide an electroluminescent display device that substantially eliminates one or more problems caused by limitations and defects in related technologies.

[0010] One aspect of this disclosure aims to provide an electroluminescent display device that forms a light-emitting layer without a mask, thereby preventing the formation of particles caused by the mask.

[0011] Additional advantages and features of this disclosure will be set forth in the following description, and in part will be apparent to those skilled in the art from the following description, or may be learned by practice of this disclosure. The objectives and other advantages of this disclosure may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0012] To achieve these and other advantages and in accordance with the purposes of this disclosure, as embodied and broadly described herein, an electroluminescent display device is provided, comprising: a substrate having a display area and a non-display area located outside the display area; a first electrode disposed in each of a plurality of sub-pixels of the display area of ​​the substrate; a connecting electrode disposed in the non-display area of ​​the substrate; a partition covering both ends of the first electrode and the top surface of the connecting electrode; a light-emitting layer disposed on the first electrode and the partition in the display area and the non-display area; and a second electrode disposed on the light-emitting layer, wherein a trench is provided in the partition in the non-display area, one side surface of the connecting electrode is exposed inside the trench, and the second electrode extends into the trench and contacts the one side surface of the connecting electrode.

[0013] In another aspect of this disclosure, an electroluminescent display device is provided, comprising: a substrate having a display area and a non-display area located outside the display area; a first electrode disposed in each of a plurality of sub-pixels of the display area of ​​the substrate; a light-emitting layer disposed on the first electrode in the display area and the non-display area; a second electrode disposed on the light-emitting layer in the display area and the non-display area; a connecting electrode disposed in the non-display area, the connecting electrode overlapping with and connected to the second electrode; and a trench disposed in the non-display area, the trench overlapping with the second electrode and contacting one side of the connecting electrode, wherein the second electrode contacts the connecting electrode in the trench.

[0014] It should be understood that the above general description of this disclosure and the following detailed description are illustrative and explanatory, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0015] The accompanying drawings, which provide a further understanding of this disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and, together with the description, serve to illustrate the principles of the disclosure. In the drawings:

[0016] Figure 1 This is a schematic plan view of an electroluminescent display device according to an embodiment of the present disclosure;

[0017] Figure 2 This is a schematic cross-sectional view of an electroluminescent display device according to an embodiment of the present disclosure, and along with... Figure 1 The cross section intercepted by line AB corresponds to the section section.

[0018] Figure 3This is a schematic plan view of an electroluminescent display device according to another embodiment of the present disclosure, and illustrates that it will be based on... Figure 2 The first, second, and third trenches of the illustrated embodiment are added to Figure 1 Examples of structures;

[0019] Figure 4 This is a schematic cross-sectional view of an electroluminescent display device according to another embodiment of the present disclosure, and corresponds to the cross-section of the first trench region of the display area;

[0020] Figure 5 This is a schematic cross-sectional view of an electroluminescent display device according to another embodiment of the present disclosure, and corresponds to the cross-section of the second trench region of the non-display area;

[0021] Figure 6 This is a schematic cross-sectional view of an electroluminescent display device according to another embodiment of the present disclosure, and corresponds to a cross-section of a plurality of third trench regions in the non-display area.

[0022] Figures 7A to 7H This is a schematic cross-sectional view of the manufacturing process of an electroluminescent display device according to an embodiment of the present disclosure;

[0023] Figures 8A to 8C This disclosure relates to an electroluminescent display device according to another embodiment of the present disclosure, and to a head-mounted display (HMD) device. Detailed Implementation

[0024] Reference will now be made in detail to the exemplary embodiments of this disclosure illustrated in the accompanying drawings. The same reference numerals are used throughout the drawings to refer to the same or similar parts whenever possible.

[0025] The advantages and features of this disclosure and its implementation methods will be illustrated by the embodiments described below with reference to the accompanying drawings. However, this disclosure may be implemented in different forms and should not be construed as limiting itself to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure comprehensive and complete, and to fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0026] The shapes, dimensions, scales, angles, and quantities disclosed in the accompanying drawings used to describe embodiments of this disclosure are merely examples, and therefore this disclosure is not limited to the details illustrated. The same reference numerals always refer to the same elements. In the following description, detailed descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of this disclosure.

[0027] When interpreting a feature, even if it is not explicitly described, the feature is interpreted as including a range of error.

[0028] When describing positional relationships, such as describing positional order as "above," "over," "below," and "after," situations where there is no contact between them can be included unless "immediately following" or "directly" is used.

[0029] When describing temporal relationships, such as describing time sequence as “after,” “following,” “next,” and “before,” discontinuous situations may be included unless “immediately after” or “directly” is used.

[0030] It should be understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited to these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0031] Those skilled in the art will fully understand that the features of the different embodiments of this disclosure can be partially or completely coupled or combined with each other, and can be interoperated with and technically driven in different ways. The embodiments of this disclosure can be implemented either independently or together in an interdependent relationship.

[0032] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic plan view of an electroluminescent display device according to an embodiment of the present disclosure.

[0034] like Figure 1 As shown, an electroluminescent display device according to an embodiment of the present disclosure may include a substrate 100, a first electrode 310, a connecting electrode 320, and a second electrode 600.

[0035] The substrate 100 can be configured with a display area DA and a non-display area NDA.

[0036] The display area DA can be the area where the image is displayed, and multiple sub-pixels SP1 to SP3 can be set in the display area DA.

[0037] The plurality of subpixels SP1 to SP3 may include a first subpixel SP1, a second subpixel SP2, and a third subpixel SP3 arranged along a first direction (e.g., the width direction). The first subpixel SP1 may emit light of a first color (e.g., red light), the second subpixel SP2 may emit light of a second color (e.g., green light), and the third subpixel SP3 may emit light of a third color (e.g., blue light). However, this disclosure is not limited thereto. The arrangement of the plurality of subpixels SP1 to SP3 may be modified to various structures known to those skilled in the art.

[0038] The non-display area NDA can be an area where no image is displayed, and it can be located outside the display area DA and surround the display area DA.

[0039] A pad area PA can be provided in the non-display area NDA. Multiple pad electrodes 230 can be arranged in the pad area PA, thereby providing signals to different circuit elements in the display area DA through the multiple pad electrodes 230. Thus, although there is no display, connection lines connecting the multiple pad electrodes 230 to different circuit elements in the display area DA can be provided in the non-display area NDA. As shown in the figure, the pad area PA can be provided on one side of the substrate 100, but it is also possible to additionally provide a pad area PA on the other side of the substrate 100, depending on the situation.

[0040] A first electrode 310 may be patterned in each of the multiple sub-pixels SP1 to SP3 of the display area DA. The first electrode 310 may serve as the anode of each of the first to third sub-pixels SP1 to SP3. The first electrode 310 may be electrically connected to the source electrode or drain electrode of the driving thin-film transistor (TFT) contained in each of the first to third sub-pixels SP1 to SP3.

[0041] A connecting electrode 320 can be provided in the non-display area NDA. The connecting electrode 320 can electrically connect the second electrode 600 to the common electrode. The connecting electrode 320 can be connected to the edge portion of the second electrode 600, thereby overlapping the edge portion of the second electrode 600. In particular, the connecting electrode 320 can be connected to all edge portions of the four sides of the second electrode 600, thereby realizing a frame structure continuous along the outer portion of the display area DA. More specifically, the connecting electrode 320 can be realized as a quadrilateral frame structure continuous in the region between the display area DA and the end of the second electrode 600. In this disclosure, the frame structure can represent a structure with a hollow interior, such as a picture frame or a donut.

[0042] The second electrode 600 can extend from the display area DA to the non-display area NDA. Specifically, the second electrode 600 can overlap with all display areas DA and can extend into a portion of the non-display area NDA. The second electrode 600 can act as the cathode for each of the first to third sub-pixels SP1 to SP3. A common voltage can be applied to the second electrode 600, thereby electrically connecting the second electrode 600 to the common electrode. Specifically, the second electrode 600 can be connected to the common electrode via the connection electrode 320 as described above, and this will be readily understood with reference to the cross-sectional views described below.

[0043] Figure 2 This is a schematic cross-sectional view of an electroluminescent display device according to an embodiment of the present disclosure, and along with... Figure 1 The cross section cut by line AB corresponds to the section cut by line AB.

[0044] like Figure 2 As shown, an electroluminescent display device according to an embodiment of the present disclosure may include a substrate 100, a circuit element layer 200, an interlayer insulating layer 280, a first electrode 310, a connecting electrode 320, a spacer 400, a light-emitting layer 500, a second electrode 600, and an encapsulation layer 700.

[0045] The substrate 100 may include glass or plastic, but is not limited to these, and may be formed of a semiconductor material (e.g., a silicon wafer). The substrate 100 may include a display area (DA) and a non-display area (NDA).

[0046] A circuit element layer 200 can be disposed on the substrate 100. The circuit element layer 200 can be disposed in the display area DA and the non-display area NDA.

[0047] In each sub-pixel SP1 to SP3, circuit elements including different signal lines, TFTs, and capacitors can be set in the circuit element layer 200 set in the display area DA.

[0048] Signal lines may include gate lines, data lines, power lines, and reference lines, and TFTs may include switching TFTs, driving TFTs, and sensing TFTs.

[0049] The switching TFT can be turned on based on the gate signal provided by the gate line, and can transmit the data voltage provided by the data line to the driving TFT.

[0050] The driving TFT can be turned on by the data voltage provided by the switching TFT, and can generate a data current from the power supplied by the power line to provide the data current to the first electrode 310. The driving TFT may include a source electrode or a drain electrode 210 electrically connected to the first electrode 310.

[0051] The sensing TFT can sense the threshold voltage deviation of the driving TFT that causes image quality degradation, and can supply current of the driving TFT to the reference line in response to a sensing control signal provided through the gate line or a separate sensing line.

[0052] A capacitor can maintain the data voltage supplied to the driving TFT for a frame and can be connected to each of the gate electrode and source electrode of the driving TFT.

[0053] Each of the switching TFT, driving TFT, and sensing TFT can be made to have different structures, such as top gate structure and bottom gate structure known to those skilled in the art.

[0054] The circuit element layer 200 set in the non-display area NDA may include a common electrode 220 and a pad electrode 230.

[0055] The common electrode 220 can be electrically connected to the second electrode 600, and a common voltage can be applied to the second electrode 600. Specifically, the common electrode 220 can be electrically connected to the second electrode 600 via the connecting electrode 320. The common electrode 220 can be formed on the same layer of the same material as the source electrode or drain electrode 210.

[0056] A pad electrode 230 can be disposed in the pad area PA. The top surface of the pad electrode 230 can be exposed to receive signals from external driving components. Therefore, contact holes CH can be formed in specific areas of each of the interlayer insulating layer 280 and the spacer 400 formed on the pad electrode 230, thereby allowing the pad electrode 230 to be connected to the external driving component through the contact holes CH. Furthermore, the light-emitting layer 500 and the encapsulation layer 700 can be removed from the pad area PA, and the second electrode 600 may not extend into the pad area PA, thereby exposing the top surface of the pad electrode 230.

[0057] The pad electrode 230 can be electrically connected to the common electrode 220 via a connecting wire. The pad electrode 230 and the common electrode 220 can be formed on the same layer from the same material.

[0058] An interlayer insulating layer 280 can be formed on the circuit element layer 200. The interlayer insulating layer 280 can be disposed in the display area DA and the non-display area NDA.

[0059] A first hole H1 and a second hole H2 can be formed in the circuit element layer 200 and the interlayer insulating layer 280.

[0060] The first hole H1 can be disposed in the display area DA, and the source electrode or drain electrode 210 can be electrically connected to the first electrode 310. That is, the source electrode or drain electrode 210 can be connected to the first electrode 310 through the first hole H1 formed in the circuit element layer 200 and the interlayer insulating layer 280. In this case, the first hole H1 can be filled with conductive material, or the first electrode 310 can be filled into the first hole H1.

[0061] The second hole H2 can be disposed in the non-display area NDA, and the common electrode 220 can be electrically connected to the connection electrode 320. That is, the common electrode 220 can be connected to the connection electrode 320 through the second hole H2 formed in the circuit element layer 200 and the interlayer insulating layer 280. In this case, the second hole H2 can be filled with conductive material, or the connection electrode 320 can be filled into the second hole H2.

[0062] The interlayer insulating layer 280 can be formed from a single layer or from a combination of multiple insulating layers. Although not shown, a reflective layer can be added to the bottom surface, top surface, or interior of the interlayer insulating layer 280 in sub-pixels SP1 to SP3, thereby creating a microcavity between the reflective layer of each sub-pixel SP1 to SP3 and the second electrode 600.

[0063] On the interlayer insulating layer 280, a first electrode 310 can be patterned in each sub-pixel SP1 to SP3. As described above, the first electrode 310 can serve as the anode of the electroluminescent display device and can be connected to the source electrode or drain electrode 210 through a first hole H1 provided in the circuit element layer 200 and the interlayer insulating layer 280.

[0064] A connection electrode 320 can be formed in the non-display area NDA on the interlayer insulating layer 280. The connection electrode 320 can be formed on the same layer using the same material as the first electrode 310. As described above, the connection electrode 320 can connect the common electrode 220 to the second electrode 600, and can be connected to the common electrode 220 through the second hole H2 provided in the circuit element layer 200 and the interlayer insulating layer 280.

[0065] A barrier 400 can be formed on the interlayer insulating layer 280, and the barrier 400 can be disposed in the display area DA and the non-display area NDA.

[0066] The partition 400 disposed in the display area DA can be formed to expose part of the top surface of the first electrode 310 and cover both ends of the first electrode 310. The part of the top surface of the first electrode 310 that is not covered by the partition 400 but exposed can be the light-emitting area. Since the partition 400 covers both ends of the first electrode 310, the problem of current concentration at one end of the first electrode 310, thereby reducing the luminous efficiency, can be solved.

[0067] In the display area DA, a first trench T1 may be included in the partition 400 and the interlayer insulating layer 280 below it. The first trench T1 may be formed in the boundary region between sub-pixels SP1 to SP3 to prevent leakage current caused by charge movement between adjacent sub-pixels SP1 to SP3. Reference will be made below. Figure 4 This will be described in detail below. As shown in the figure, the first trench T1 formed can pass through the dike 400 without passing through the interlayer insulation layer 280, but is not limited thereto. The first trench T1 can pass through the interlayer insulation layer 280 and can extend to a portion of the circuit element layer 200 below it. The first trench T1 can be the same as the second trench T2 and the third trench T3 described below.

[0068] The partition 400 provided in the non-display area NDA can be formed to not cover one side surface of the connection electrode 320, and to cover the top surface and the other side surface of the connection electrode 320. Specifically, in the non-display area NDA, a second trench T2 can be provided in the partition 400 and the interlayer insulating layer 280 below it, and one end of the second trench T2 can expose one side surface of the connection electrode 320. Correspondingly, one side surface of the connection electrode 320 can be exposed inside the second trench T2.

[0069] The second trench T2 allows the second electrode 600 to be connected to the connecting electrode 320. Specifically, in the second trench T2, the second electrode 600 can be connected to the connecting electrode 320. For this purpose, the width W2 of the second trench T2 is preferably set to be greater than the width W1 of the first trench T1. Reference can be made to the following description. Figure 5 To understand this.

[0070] The second trench T2 can be formed to overlap with the second electrode 600, exposing one side surface of the connecting electrode 320, and corresponding to the connecting electrode 320. More specifically, the second trench T2 can be implemented as a continuous quadrilateral frame structure between the end of the second electrode 600 and one side surface of the connecting electrode 320. See the following description... Figure 3 To understand this.

[0071] Furthermore, in the non-display area NDA, multiple third trenches T3 can be provided in the partition 400 and the interlayer insulating layer 280 below it. The multiple third trenches T3 can be located in the area between the second trench T2 and the pad area PA.

[0072] Multiple third trenches T3 can prevent the organic layer 720 of the encapsulation layer 700 from diffusing to the end of the substrate 100. For this purpose, the width W3 of each third trench T3 is preferably set to be greater than the width W1 of the first trench T1. The width W3 of each third trench T3 can be set to be equal to the width W2 of the second trench T2, but is not limited thereto.

[0073] Each third trench T3 can be implemented as a continuous quadrilateral frame structure between the end of the second electrode 600 and the end of the substrate 100. See the following description. Figure 3 To understand this.

[0074] A light-emitting layer 500 can be formed on the first electrode 310 and the spacer 400. The light-emitting layer 500 can be disposed in the display area DA and the non-display area NDA.

[0075] The light-emitting layer 500 can be formed in the display area DA in the regions corresponding to the plurality of sub-pixels SP1 to SP3 and in the boundary regions between the plurality of sub-pixels SP1 to SP3. However, a portion of the light-emitting layer 500 can be formed discontinuously in the first trench T1, thereby preventing leakage current between adjacent sub-pixels SP1 to SP3. (Refer to below) Figure 4 Let me describe this.

[0076] In the non-display area NDA, the light-emitting layer 500 can be formed to be discontinuous in the second trench T2 and discontinuous in the third trench T3. The following will refer to... Figure 5 and 6 Let me describe this in detail.

[0077] The second electrode 600 can be formed on the light-emitting layer 500. The second electrode 600 can serve as the cathode of the electroluminescent display device.

[0078] The second electrode 600 can be set in the display area DA and the non-display area NDA.

[0079] The second electrode 600 can be formed in all display areas DA. That is, in the display area DA, the second electrode 600 can be formed to be continuous in each sub-pixel SP1 to SP3 and in the boundary regions between sub-pixels.

[0080] Compared to the light-emitting layer 500, the second electrode 600 can extend less into the non-display area NDA. That is, the end of the light-emitting layer 500 can be positioned closer to the end of the substrate 100 than the end of the second electrode 600. In other words, the distance between the end of the light-emitting layer 500 and the end of the substrate 100 can be shorter than the distance between the end of the second electrode 600 and the end of the substrate 100.

[0081] The second electrode 600 may overlap with the second trench T2, but not with the third trench T3. That is, the second electrode 600 will not extend into the region of the third trench T3. In this case, within the second trench T2, the second electrode 600 may be connected to a side surface of the connecting electrode 320. The following will refer to... Figure 5 Let me describe this.

[0082] An encapsulation layer 700 can be formed on the second electrode 600. The encapsulation layer 700 can be disposed in the display area DA and the non-display area NDA.

[0083] The encapsulation layer 700 may include a first inorganic layer 710, an organic layer 720, and a second inorganic layer 730. The first inorganic layer 710 may be formed on the second electrode 600, the organic layer 720 may be formed on the first inorganic layer 710, and the second inorganic layer 730 may be formed on the organic layer 720.

[0084] Compared to the organic layer 720, the first inorganic layer 710 and the second inorganic layer 730 can extend further into the non-display area NDA. Accordingly, at the end of the encapsulation layer 700, the top surface of the first inorganic layer 710 can contact the bottom surface of the second inorganic layer 730.

[0085] In the non-display area (NDA), the first inorganic layer 710 and the second inorganic layer 730 may be formed to overlap with all the second trenches T2 and the plurality of third trenches T3. On the other hand, the organic layer 720 may be formed to overlap with the second trenches T2 but not with some of the third trenches T3. Accordingly, in the third trenches T3 that do not overlap with the organic layer 720, the first inorganic layer 710 may contact the second inorganic layer 730. However, the organic layer 720 may, as appropriate, overlap with all the second trenches T2 and the plurality of third trenches T3.

[0086] The third trench T3 prevents the organic layer 720 from extending to the end of the substrate 100, thereby preventing external oxygen or water from penetrating into the display area DA through the organic layer 720. In other words, the organic layer 720 can fill at least one of the multiple third trenches T3, so that it does not extend to the end of the substrate 100.

[0087] Figure 3This is a schematic plan view of an electroluminescent display device according to another embodiment of the present disclosure, and illustrates the device to be used in accordance with the above references. Figure 2 The first trench T1, the second trench T2, and the third trench T3 of the described embodiment are added to Figure 1 Examples of the structure. Therefore, the configuration of each of the first trench T1, the second trench T2, and the third trench T3 will be described below.

[0088] like Figure 3 As shown, a first groove T1 can be formed in the boundary region between sub-pixels SP1 to SP3 in the display area DA. As shown, the first groove T1 can be formed in the boundary region between the left and right sub-pixels SP1 to SP3, and can be implemented as a strip structure, but is not limited to this. The first groove T1 can also be additionally formed in the boundary region between the upper sub-pixel and the lower sub-pixels SP1 to SP3, and implemented as a grid structure.

[0089] The second trench T2 can correspond to the contact area between the second electrode 600 and the connecting electrode 320. To increase the contact area between the second electrode 600 and the connecting electrode 320, the second trench T2 can be formed in the region between the end of the second electrode 600 and a side surface (e.g., the outer surface of the connecting electrode 320). Specifically, the second trench T2 can be implemented as a continuous quadrilateral frame structure surrounding the connecting electrode 320. However, this disclosure is not limited to this; the second trench T2 can be implemented only as a partial structure within the quadrilateral frame structure, such as the vertical side structure of the left-facing pad area PA.

[0090] Multiple third trenches T3 may be formed in the region between the end of the second electrode 600 and the end of the substrate 100. In particular, the multiple third trenches T3 may be implemented as continuous along the outside of the second electrode 600 to surround a quadrilateral frame structure of the second electrode 600. The multiple third trenches T3 may be formed between the pad area PA and the end of the second electrode 600.

[0091] Figure 4 This is a schematic cross-sectional view of an electroluminescent display device according to another embodiment of the present disclosure, and is related to... Figure 2 The cross-section of the first trench T1 region of the display area DA corresponds to that of the display area DA.

[0092] like Figure 4 As shown, an electroluminescent display device according to another embodiment of the present disclosure may include a substrate 100, a circuit element layer 200, an interlayer insulating layer 280, a first electrode 310, a spacer 400, a light-emitting layer 500, a second electrode 600, and an encapsulation layer 700.

[0093] The circuit element layer 200 can be formed on the substrate 100, and in each of the first sub-pixel SP1 and the second sub-pixel SP2, the circuit element layer 200 can include the source electrode or drain electrode 210 for driving the TFT.

[0094] An interlayer insulating layer 280 may be formed on the circuit element layer 200. In each of the first sub-pixels SP1 and the second sub-pixel SP2, the circuit element layer 200 and the interlayer insulating layer 280 may include a first hole H1.

[0095] In each of the first sub-pixels SP1 and the second sub-pixel SP2, the first electrode 310 can be patterned and connected to the source electrode or drain electrode 210 of the driving TFT through the first hole H1.

[0096] The dam 400 can be formed to cover both ends of the first electrode 310.

[0097] In the boundary region between the first sub-pixel SP1 and the second sub-pixel SP2, a first trench T1 with a first width W1 can be formed in the dam 400 and the interlayer insulating layer 280.

[0098] A light-emitting layer 500 can be formed on the first electrode 310 and the partition 400.

[0099] The light-emitting layer 500 may be configured to emit white (W) light. For this purpose, the light-emitting layer 500 may include multiple stacks that emit light of different colors. In detail, the light-emitting layer 500 may include a first stack 510, a second stack 530, and a charge generation layer 520 disposed between the first stack 510 and the second stack 530.

[0100] The first stack 510 can be implemented using a stacked structure of a hole injection layer, a hole transport layer, a first organic light-emitting layer emitting blue or yellow-green light, and an electron transport layer. The second stack 530 can be implemented using a stacked structure of a hole transport layer, a second organic light-emitting layer emitting yellow-green or blue light, an electron transport layer, and an electron injection layer. The charge generation layer 520 may include an N-type charge generation layer disposed on the first stack 510 and a P-type charge generation layer disposed on the N-type charge generation layer.

[0101] The first stack 510 may be discontinuous within the first trench T1. Specifically, a portion of the first stack 510 formed on one side surface (e.g., the left side surface) inside the first trench T1 may be disconnected from a portion of the first stack 510 formed on another side surface (e.g., the right side surface) inside the first trench T1, relative to the central portion of the first trench T1. Furthermore, a portion of the first stack 510 formed on the bottom surface inside the first trench T1 may be disconnected from portions of the first stack 510 formed on both the one side surface and the other side surface inside the first trench T1. Accordingly, charge will not move through the first stack 510 between sub-pixels SP1 and SP2, which are arranged adjacent to each other and separated by the first trench T1.

[0102] The charge generation layer 520 may be formed on the first stack 510 and is discontinuous in the first trench T1 or in the region overlapping with the first trench T1. Specifically, a portion of the charge generation layer 520 formed on one side (e.g., the left side) of the first trench T1 may be disconnected from a portion of the charge generation layer 520 formed on the other side (e.g., the right side) of the first trench T1 relative to the center portion of the first trench T1. Furthermore, a portion of the charge generation layer 520 formed on the bottom surface inside the first trench T1 may be disconnected from portions of the charge generation layer 520 formed on both sides inside the first trench T1. Accordingly, between sub-pixels SP1 and SP2 arranged adjacent to each other and having the first trench T1 between them, charge will not move through the charge generation layer 520.

[0103] The second stack 530 formed on the charge generation layer 520 can be continuous, and between sub-pixels SP1 and SP2 arranged adjacent to each other and having a first trench T1 between them, the second stack 530 can be continuous. That is, a portion of the second stack 530 formed on one side (e.g., the left side) of the first trench T1 relative to the center portion of the first trench T1 can be connected to a portion of the second stack 530 formed on the other side (e.g., the right side) of the first trench T1. Accordingly, charge can move through the second stack 530 between the sub-pixels SP1 and SP2 arranged adjacent to each other and having a first trench T1 between them.

[0104] The conductivity of the charge generation layer 520 can be greater than that of the second stack 530. Specifically, the N-type charge generation layer constituting the charge generation layer 520 may include a metallic material, thereby exhibiting greater conductivity than the second stack 530. Therefore, charge movement can be performed between adjacent sub-pixels SP1 and SP2 via the charge generation layer 520, while the amount of charge movement via the second stack 530 is minimal. Accordingly, according to one embodiment of this disclosure, the charge generation layer 520 can be configured to be discontinuous in the region overlapping with the first trench T1, thereby reducing charge movement between adjacent sub-pixels SP1 and SP2 and preventing leakage current.

[0105] A second electrode 600 can be formed on the light-emitting layer 500.

[0106] An encapsulation layer 700 may be formed on the second electrode 600. The encapsulation layer 700 may include a first inorganic layer 710, an organic layer 720, and a second inorganic layer 730 stacked in sequence.

[0107] Figure 5 This is a schematic cross-sectional view of an electroluminescent display device according to another embodiment of the present disclosure, and is related to... Figure 2 The cross-section corresponds to the second trench T2 region of the non-display area NDA.

[0108] like Figure 5 As shown, an electroluminescent display device according to another embodiment of the present disclosure may include a substrate 100, a circuit element layer 200, an interlayer insulating layer 280, a connecting electrode 320, a spacer 400, a light-emitting layer 500, a second electrode 600, and an encapsulation layer 700.

[0109] The circuit element layer 200 can be formed on the substrate 100 and may include a common electrode 220.

[0110] An interlayer insulating layer 280 may be formed on the circuit element layer 200. The circuit element layer 200 and the interlayer insulating layer 280 may include a second via H2.

[0111] The connecting electrode 320 can be formed on the interlayer insulating layer 280 and can be connected to the common electrode 220 through the second hole H2.

[0112] A barrier 400 can be formed on the connecting electrode 320 and the interlayer insulating layer 280. In this case, a second trench T2 with a second width W2 can be formed in the barrier 400 and the interlayer insulating layer 280. The second trench T2 can be configured to expose the connecting electrode 320. That is, one end of the second trench T2 can expose a side surface of the connecting electrode 320. Correspondingly, a side surface of the connecting electrode 320 can be exposed inside the second trench T2. The second width W2 of the second trench T2 can be greater than the first width W1 of the first trench T1 as described above.

[0113] The light-emitting layer 500 can be formed on the dam 400. In this case, the second width W2 of the second trench T2 can be set to be large, so that the first stack 510, the charge generation layer 520 and the second stack 530 constituting the light-emitting layer 500 can be discontinuous in the second trench T2.

[0114] Specifically, relative to the central portion of the second trench T2, a portion of the first stack 510 formed on one side (e.g., the left side) of the second trench T2 may be disconnected from a portion of the first stack 510 formed on the other side (e.g., the right side) of the second trench T2. Furthermore, a portion of the first stack 510 formed on the bottom surface inside the second trench T2 may be disconnected from the portions of the first stack 510 formed on both sides of the second trench T2.

[0115] Similarly, relative to the central portion of the second trench T2, a portion of the charge generation layer 520 formed on one side (e.g., the left side) of the second trench T2, a portion of the charge generation layer 520 formed on the other side (e.g., the right side) of the second trench T2, and a portion of the charge generation layer 520 formed on the bottom surface inside the second trench T2 can be disconnected from each other.

[0116] Furthermore, relative to the central portion of the second trench T2, a portion of the second stack 530 formed on one side (e.g., the left side) of the second trench T2, a portion of the second stack 530 formed on the other side (e.g., the right side) of the second trench T2, and a portion of the second stack 530 formed on the bottom surface inside the second trench T2 can be disconnected from each other.

[0117] Therefore, one side surface of the connection electrode 320 exposed on the side surface of the second trench T2 can be exposed without being covered by the light-emitting layer 500.

[0118] The second electrode 600 can be formed on the light-emitting layer 500. In particular, the second electrode 600 can be non-disconnected and can be continuous in the second trench T2. Accordingly, the second electrode 600 can extend along the side surface inside the second trench T2 where the light-emitting layer 500 is not formed, and can be connected to the side surface of the connecting electrode 320.

[0119] In this configuration, the second electrode 600 can be formed using a double-layer structure of a lower layer 610 and an upper layer 620, which is formed by a separate deposition process. The second electrode 600 can also be formed from a single layer; however, in this case, due to process errors, the second electrode 600 may be discontinuous in the second trench T2. If the second electrode 600 is formed using a double-layer structure of lower layer 610 and upper layer 620, even if the lower layer 610 is discontinuous in the second trench T2, the discontinuous lower layer 610 can be interconnected through the upper layer 620. The lower layer 610 and upper layer 620 can be formed using a sputtering process with good stepped coverage, but depending on the situation, the upper layer 620 can be formed only by a sputtering process, while the lower layer 610 can be formed by an evaporation process.

[0120] The encapsulation layer 700 may be formed on the second electrode 600. The encapsulation layer 700 may include a first inorganic layer 710, an organic layer 720 and a second inorganic layer 730 stacked in sequence.

[0121] Figure 6 This is a schematic cross-sectional view of an electroluminescent display device according to another embodiment of the present disclosure, and is related to... Figure 2 The cross-sections of the multiple third trench T3 regions of the non-display area NDA correspond to each other.

[0122] like Figure 6 As shown, an electroluminescent display device according to another embodiment of the present disclosure may include a substrate 100, a circuit element layer 200, an interlayer insulating layer 280, a spacer 400, a light-emitting layer 500, and an encapsulation layer 700.

[0123] A circuit element layer 200 can be formed on the substrate 100, an interlayer insulating layer 280 can be formed on the circuit element layer 200, and a spacer 400 can be formed on the interlayer insulating layer 280. In this case, a plurality of third trenches T3, each having a third width W3, can be formed in the spacer 400 and the interlayer insulating layer 280. The third width W3 of the third trenches T3 can be greater than the first width W1 of the first trenches T1 as described above.

[0124] A light-emitting layer 500 can be formed on the dike 400. In this case, it is similar to that described above. Figure 5 Similarly, the first stack 510, the charge generation layer 520, and the second stack 530 constituting the light-emitting layer 500 may be discontinuous in the plurality of third trenches T3.

[0125] The encapsulation layer 700 may be formed on the top surface of the light-emitting layer 500 to contact the light-emitting layer 500. The encapsulation layer 700 may include a first inorganic layer 710, an organic layer 720, and a second inorganic layer 730 stacked in sequence.

[0126] In this configuration, the first inorganic layer 710 and the second inorganic layer 730 can overlap with the plurality of third trenches T3 and with all light-emitting layers 500. Specifically, the first inorganic layer 710 can be continuous along the inner side surface of each of the plurality of third trenches T3. On the other hand, the organic layer 720 can overlap with one third trench T3 but not with the others, thus overlapping a portion of the light-emitting layer 500 but not the rest. As a result, the end region of the encapsulation layer 700 can be configured without the organic layer 720 and with the first inorganic layer 710 contacting the second inorganic layer 730, thereby preventing external water or oxygen from penetrating the end region of the encapsulation layer 700.

[0127] Figures 7A to 7H This is a schematic cross-sectional view of the manufacturing process of an electroluminescent display device according to an embodiment of the present disclosure, and is as described above. Figure 2 A view of the manufacturing process of an electroluminescent display device. Therefore, detailed descriptions of the same components will be omitted.

[0128] First, such as Figure 7A As shown, a circuit element layer 200 including a source or drain electrode 210 for driving TFTs, a common electrode 220, and a pad electrode 230 can be formed on the substrate 100. The source or drain electrode 210 can be patterned in each sub-pixel SP1 to SP3 in the display area DA of the substrate 100, the common electrode 220 can be patterned in the non-display area NDA of the substrate 100, and the pad electrode 230 can be patterned in the pad area PA of the substrate 100.

[0129] Subsequently, an interlayer insulating layer 280 can be formed on the circuit element layer 200. A first hole H1 can be formed in the interlayer insulating layer 280 and the circuit element layer 200 to expose the source electrode or drain electrode 210. At the same time, a second hole H2 can be formed in the interlayer insulating layer 280 and the circuit element layer 200 to expose the common electrode 220.

[0130] Subsequently, a first electrode 310 and a connecting electrode 320 can be formed on the interlayer insulating layer 280. The first electrode 310 can be connected to the source electrode or drain electrode 210 through a first hole H1, and the connecting electrode 320 can be connected to the common electrode 220 through a second hole H2.

[0131] Subsequently, a barrier 400 can be formed on the entire surface of the substrate 100. The barrier 400 can be formed on the interlayer insulating layer 280, the first electrode 310, and the connecting electrode 320.

[0132] Subsequently, as Figure 7BAs shown, by removing specific areas of each of the barrier 400 and the interlayer insulation layer 280, a plurality of first trenches T1, a second trench T2, a plurality of third trenches T3, and contact holes CH can be formed.

[0133] Multiple first trenches T1 can be formed in the boundary region between sub-pixels SP1 to SP3 in the display area DA, a second trench T2 can be formed to expose a side surface of the connection electrode 320 in the non-display area NDA, multiple third trenches T3 can be formed in the region between the second trench T2 and the pad electrode 230, and a contact hole CH can be formed to expose the pad electrode 230.

[0134] In this case, a contact hole CH can be formed first, and then multiple first trenches T1, second trenches T2 and multiple third trenches T3 can be formed simultaneously.

[0135] Subsequently, a specific area of ​​the dam 400 disposed on the first electrode 310 can be removed to expose a portion of the top surface of the first electrode 310.

[0136] Subsequently, as Figure 7C As shown, the light-emitting layer 500 can be formed on the entire surface of the substrate 100 without a mask. Thus, the light-emitting layer 500 can be formed on the exposed portions of the top surfaces of the partition 400 and the first electrode 310, and the light-emitting layer 500 can be formed in a plurality of first trenches T1, second trenches T2, a plurality of third trenches T3, and contact holes CH. (Referring to the above...) Figure 4-6 The structure of the light-emitting layer 500 formed in a plurality of first trenches T1, second trenches T2 and a plurality of third trenches T3 is described.

[0137] Subsequently, as Figure 7D As shown, a second electrode 600 can be formed on the light-emitting layer 500. The second electrode 600 can extend from the display area DA to the non-display area NDA. In particular, the second electrode 600 can extend through the interior of the second trench T2, but will not extend into the plurality of third trenches T3. In this case, as referenced above... Figure 5 The second electrode 600 can contact a side surface of the connecting electrode 320 in the second trench T2, and can be formed by a double-layer structure having a lower layer 610 and an upper layer 620.

[0138] Subsequently, as Figure 7E As shown, a first inorganic layer 710 can be formed on the entire surface of the substrate 100. The first inorganic layer 710 can be formed on the top surface of the second electrode 600 and the light-emitting layer 500, and can also be formed in the second trench T2, a plurality of third trenches T3 and contact holes CH.

[0139] Subsequently, as Figure 7F As shown, an organic layer 720 can be formed on the first inorganic layer 710. The organic layer 720 can fill some of the second trench T2 and the plurality of third trenches T3, but will not fill the other third trenches T3.

[0140] Subsequently, as Figure 7G As shown, a second inorganic layer 730 can be formed on the entire surface of the substrate 100. The second inorganic layer 730 can be formed on the organic layer 720 and the first inorganic layer 710. In particular, the second inorganic layer 730 can be formed in other third trenches T3 and contact holes CH that are not filled by the organic layer 720.

[0141] Subsequently, as Figure 7H As shown, the pad electrode 230 can be exposed by removing the light-emitting layer 500, the first inorganic layer 710 and the second inorganic layer 730 formed in the pad area PA.

[0142] As described above, according to one embodiment of the present disclosure, since the light-emitting layer 500 is formed without a mask, the problem of particulate contamination of the light-emitting layer 500 due to the mask can be solved.

[0143] Figures 8A to 8C The present disclosure relates to an electroluminescent display device according to another embodiment of the present disclosure, and to a head-mounted display (HMD) device.

[0144] like Figure 8A As shown, the HMD device according to this disclosure may include a housing 10 and a head restraint strap 30.

[0145] The housing 10 can accommodate components such as display devices, lens arrays, and eyepieces.

[0146] The head strap 30 can be secured to the housing 10. The illustrated head strap 30 is configured to surround the user's two side surfaces and the top surface, but is not limited thereto. The head strap 30 can secure the HMD device to the user's head and can be replaced by a frame-type or helmet-type structure.

[0147] like Figure 8B As shown, the HMD device with VR structure according to this disclosure may include a left eye display device 12, a right eye display device 11, a lens array 13, a left eyepiece 20a, and a right eyepiece 20b.

[0148] The left eye display device 12, the right eye display device 11, the lens array 13, the left eye eyepiece 20a and the right eye eyepiece 20b can be housed in the housing 10.

[0149] The left-eye display device 12 and the right-eye display device 11 can display the same image, in which case the user can view a two-dimensional (2D) image. Alternatively, the left-eye display device 12 can display a left-eye image, and the right-eye display device 11 can display a right-eye image. Each of the left-eye display device 12 and the right-eye display device 11 can be configured as an electroluminescent display device as described above. In this case, in the electroluminescent display device, the surface displaying the image can face the lens array 13.

[0150] Lens array 13 can be spaced apart from each of the left eyepiece 20a and the left eye display device 12, and can be disposed between the left eyepiece 20a and the left eye display device 12. That is, lens array 13 can be disposed in front of the left eyepiece 20a and behind the left eye display device 12. Similarly, lens array 13 can be spaced apart from each of the right eyepiece 20b and the right eye display device 11, and can be disposed between the right eyepiece 20b and the right eye display device 11. That is, lens array 13 can be disposed in front of the right eyepiece 20b and behind the right eye display device 11.

[0151] Lens array 13 can be a microlens array. Lens array 13 can be replaced by a pinhole array. By using lens array 13, the image displayed by the left eye display device 12 or the right eye display device 11 can be magnified by a certain magnification, thereby allowing the user to see the magnified image.

[0152] The user's left eye (LE) can be located in the left eyepiece 20a, and the user's right eye (RE) can be located in the right eyepiece 20b.

[0153] like Figure 8C As shown, the HMD device with an AR structure according to this disclosure may include a left-eye display device 12, a lens array 13, a left-eye eyepiece 20a, a transmission and reflection component 14, and a transmission window 15. Figure 8C For convenience, only the left eye component is shown in the image; the right eye component can be the same as the left eye component.

[0154] The left eye display device 12, lens array 13, left eye eyepiece 20a, transmission and reflection component 14, and transmission window 15 can be housed in the housing 10.

[0155] The left-eye display device 12 can be positioned on one side (e.g., above) of the transmission-reflection member 14 without covering the transmission window 15. Therefore, the left-eye display device 12 can provide an image to the transmission-reflection member 14 without obscuring the external background seen through the transmission window 15.

[0156] The left eye display device 12 can be configured as an electroluminescent display device as described above. In this case, in the electroluminescent display device, the surface displaying the image can face the lens array 13.

[0157] The lens array 13 can be positioned between the left eyepiece 20a and the transmission and reflection component 14.

[0158] The user's left eye can be located in the left eyepiece 20a.

[0159] A transmission-reflection component 14 may be disposed between the lens array 13 and the transmission window 15. The transmission-reflection component 14 may include a reflective surface 14a that transmits a portion of light and reflects another portion. The reflective surface 14a may be configured to propagate the image displayed on the left-eye display device 12 to the lens array 13. Accordingly, the user can see all the external background and the image displayed on the left-eye display device 12 through the transmission window 15. That is, the user can see an image containing both a real background and a virtual image, thereby enabling AR (Augmented Reality).

[0160] The transmission window 15 can be positioned in front of the transmission and reflection component 14.

[0161] According to embodiments of this disclosure, since trenches are formed in the non-display area, the light-emitting layer is discontinuous in the trenches, and the second electrode can be connected to the connecting electrode in the trenches, the light-emitting layer can be formed without a mask, thereby solving the problem of particle generation due to the mask.

[0162] According to embodiments of this disclosure, in the non-display area, a plurality of trenches may be additionally formed outside the second electrode, thereby preventing the organic layer constituting the encapsulation layer from extending to the end of the substrate, thus preventing external oxygen or water from penetrating into the display area through the organic layer.

[0163] According to embodiments of this disclosure, in the display area, additional trenches can be formed in the boundary region between adjacent sub-pixels, thereby making the charge generation layer constituting the light-emitting layer discontinuous in the other trenches, thus solving the problem of leakage current between adjacent sub-pixels.

[0164] The features, structures, and effects described above in this disclosure are included in at least one embodiment of this disclosure, but are not limited to only one embodiment. Furthermore, those skilled in the art to which this disclosure pertains can implement the features, structures, and effects described in at least one embodiment of this disclosure by combining or modifying other embodiments. Therefore, content related to these combinations and variations should be interpreted as being included within the scope of this disclosure.

[0165] It will be apparent to those skilled in the art that various modifications and variations can be made to this disclosure without departing from its spirit or scope. Therefore, if any modifications and variations of this disclosure fall within the scope of the appended claims and their equivalents, then this disclosure should cover those modifications and variations.

Claims

1. An electroluminescent display device, comprising: A substrate having a display area and a non-display area located outside the display area; A first electrode is disposed in each of the plurality of sub-pixels of the display area on the substrate; Connection electrodes are disposed in the non-display area of ​​the substrate; A dike covering both ends of the first electrode and the top surface of the connecting electrode; The connection electrode and the interlayer insulating layer below the partition are disposed in the non-display area of ​​the substrate; A light-emitting layer disposed on the first electrode and the partition in the display area and the non-display area; as well as The second electrode is disposed on the light-emitting layer. In this embodiment, a trench is provided in the partition and the interlayer insulating layer in the non-display area, and one side surface of the connecting electrode is exposed inside the trench of the partition. The second electrode extends into the trench of the partition and the trench of the interlayer insulating layer and contacts the side surface of the connecting electrode exposed inside the trench of the partition.

2. The electroluminescent display device as claimed in claim 1, wherein... One end of the trench exposes one side surface of the connecting electrode. The top surface of the connecting electrode and the other side surface of the connecting electrode are covered by the dike.

3. The electroluminescent display device of claim 1, wherein the light-emitting layer overlaps with the connecting electrode and the light-emitting layer is discontinuous in the trench.

4. The electroluminescent display device of claim 1, wherein the light-emitting layer is disposed on the bottom surface inside the trench and exposes the one side surface of the connecting electrode.

5. The electroluminescent display device as claimed in claim 1, wherein... Outside the trench in the non-display area, multiple other trenches are provided in the dike and the interlayer insulation layer. The light-emitting layer is discontinuous in the other trenches.

6. The electroluminescent display device of claim 5, wherein the second electrode does not overlap with the plurality of other trenches.

7. The electroluminescent display device of claim 5, further comprising an encapsulation layer, the encapsulation layer comprising a first inorganic layer disposed on the second electrode, an organic layer disposed on the first inorganic layer, and a second inorganic layer disposed on the organic layer. The first inorganic layer and the second inorganic layer overlap with the plurality of other trenches, and the organic layer does not overlap with at least one of the plurality of other trenches.

8. The electroluminescent display device as claimed in claim 1, wherein... In the boundary region between the plurality of sub-pixels, another groove is additionally provided in the dike of the display area. The width of the groove disposed in the non-display area is greater than the width of the other groove disposed in the display area.

9. The electroluminescent display device as claimed in claim 8, wherein... The light-emitting layer comprises a first stack, a charge-generating layer, and a second stack. The first stack, the charge generation layer, and the second stack are discontinuous in the trenches disposed in the non-display area. The first stack and the charge generation layer are discontinuous in the other trench provided in the display area, while the second stack is continuous in the other trench provided in the display area.

10. The electroluminescent display device of claim 8, wherein the interlayer insulating layer is further disposed below the first electrode and the spacer in the display area of ​​the substrate. The other trench extends into the interior of the interlayer insulation layer.

11. The electroluminescent display device of claim 1, wherein the first electrode and the connecting electrode comprise the same material and are disposed on the same layer.

12. The electroluminescent display device as claimed in claim 1, wherein... The first electrode is connected to the source or drain electrode of the driving thin-film transistor through a first hole, and the connection electrode is connected to the common electrode through a second hole. The source electrode or drain electrode and the common electrode are made of the same material and are disposed on the same layer.

13. The electroluminescent display device as claimed in claim 1, further comprising pad electrodes disposed in the non-display area, The dam includes contact holes that expose the pad electrodes.

14. The electroluminescent display device as claimed in claim 1, further comprising: A lens array separated from the substrate; as well as A housing that accommodates the substrate and the lens array.

15. An electroluminescent display device, comprising: A substrate having a display area and a non-display area located outside the display area; A first electrode is disposed in each of a plurality of sub-pixels in the display area of ​​the substrate; A light-emitting layer disposed on the first electrode in the display area and the non-display area; A second electrode is disposed on the light-emitting layer in the display area and the non-display area; A connection electrode is configured in the non-display area to overlap with and connect to the second electrode; A dike covering both ends of the first electrode and the top surface of the connecting electrode; The connection electrode and the interlayer insulating layer below the partition are disposed in the non-display area of ​​the substrate; In the non-display area, trenches are formed in the partition and the interlayer insulating layer to overlap with the second electrode, and one side of the connecting electrode is exposed inside the trench of the partition. The second electrode extends into the interior of the trench of the dike and the interior of the trench of the interlayer insulation layer and contacts the side of the connecting electrode exposed inside the trench of the dike.

16. The electroluminescent display device of claim 15, wherein the light-emitting layer is disposed on the bottom surface of the trench and exposes one side of the connecting electrode.

17. The electroluminescent display device of claim 15, wherein the connecting electrode is configured as a continuous frame structure along the outside of the display area between the end of the second electrode and the display area.

18. The electroluminescent display device of claim 17, wherein the trench is configured as a frame structure continuous along one side surface of the connecting electrode between the end of the second electrode and the connecting electrode.

19. The electroluminescent display device of claim 15, further comprising a plurality of other trenches located outside the trench in the non-display area. The plurality of additional trenches are configured as a continuous frame structure along the outside of the second electrode between the end of the substrate and the end of the second electrode.

20. The electroluminescent display device of claim 15, further comprising another trench disposed in the boundary region between the plurality of sub-pixels of the display area. The width of the groove disposed in the non-display area is greater than the width of the other groove disposed in the display area.

Images