Display device

Abstract

A display device in one example includes: a first bank disposed on a planarization layer of a non-emission area; and a first electrode disposed on the planarization layer of the light emitting region. A trench is provided in an upper surface of the first bank, and a first electrode extends to the upper surface of the first bank and is provided in the trench. Accordingly, damage to the light emitting device due to outgassing may be prevented.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0191382, filed in Korea on December 26, 2023, the entire contents of which are hereby incorporated by reference into this application. Technical field

[0003] The present disclosure relates to a display device capable of preventing damage to a light - emitting device caused by outgassing. Background art

[0004] In addition to the display screen of a television or a monitor, display devices are also widely used as the display screens of laptop computers, tablet computers, smart phones, portable display devices, and portable information devices. With the progress of technology, in addition to the image - display function, display devices can also provide a photographing function or various sensing functions. Therefore, display devices need to include electronic devices such as cameras or sensors.

[0005] Among display devices, an organic light - emitting display device is self - emissive and has advantages such as excellent viewing angles and contrast ratios compared to a liquid - crystal display (LCD). In addition, in an organic light - emitting display device, since a separate backlight is not required, it can be made lightweight and thin, and thus power consumption can be advantageously reduced. In addition, the organic light - emitting display device has the advantages of being able to drive at a DC low voltage, having a fast response speed, and especially a low manufacturing cost.

[0006] Recently, in order to improve the reflection visibility of a display device, a black matrix including a light - absorbing material has been used. In this case, outgas is generated in the process of forming the black matrix. The outgas generated in the black matrix can pass through adjacent light - emitting devices and damage the light - emitting devices. In particular, the outgas can penetrate into the boundary region between the anode associated with the light - emitting device and the light - emitting layer. Therefore, dark spots can be generated in the pixels where the damaged light - emitting devices are provided, and the reliability of the display device can be reduced or deteriorated. Summary of the invention

[0007] The present disclosure has been made in view of the above - mentioned limitations associated with the related art, and an object of the present disclosure is to provide a display device capable of preventing damage to a light - emitting device caused by outgassing.

[0008] According to aspects of the present disclosure, the above and other objects can be achieved by providing a display device including: a substrate on which a plurality of sub-pixels are provided, the plurality of sub-pixels including a light-emitting region and a non-light-emitting region surrounding the light-emitting region; a planarization layer provided in the light-emitting region and the non-light-emitting region; a first bank provided on the planarization layer in the non-light-emitting region; a first electrode provided on the planarization layer in the light-emitting region; and a second bank provided on the first bank, wherein a trench is provided in an upper surface of the first bank, and the first electrode extends to the upper surface of the first bank and is provided in the trench.

[0009] Furthermore, according to aspects of the present disclosure, the above and other objects can be achieved by providing a display device including: a substrate on which a plurality of sub-pixels are provided, the plurality of sub-pixels including a light-emitting region and a non-light-emitting region surrounding the light-emitting region; a planarization layer provided in the light-emitting region and the non-light-emitting region; a first bank provided on the planarization layer in the non-light-emitting region; a first electrode provided on the planarization layer in the light-emitting region; a protective layer provided on the first bank; and a second bank provided on the protective layer, wherein a trench is provided in an upper surface of the first bank and the protective layer is provided in the trench.

[0010] Moreover, according to aspects of the present disclosure, the above and other objects can be achieved by providing a display device including: a substrate on which a plurality of sub-pixels are provided, the plurality of sub-pixels including a light-emitting region and a non-light-emitting region surrounding the light-emitting region; a bank provided in the non-light-emitting region; and a first electrode provided in the light-emitting region, wherein the bank includes a trench surrounding the light-emitting region of each of the plurality of sub-pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present disclosure will be more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only, and thus the present disclosure is non-limiting.

[0012] Figure 1 is a plan view of a display device according to an embodiment of the present disclosure.

[0013] Figure 2 and Figure 3 is a plan view of a pixel of a display device according to an embodiment of the present disclosure.

[0014] Figure 4 is a cross-sectional view of a sub-pixel of a display device according to the first embodiment of the present disclosure.

[0015] Figure 5 is a cross-sectional view of a modified example of a sub-pixel of a display device according to the first embodiment of the present disclosure.

[0016] Figure 6 is a cross-sectional view of a sub-pixel of a display device according to the second embodiment of the present disclosure.

[0017] Figure 7 is a plan view of a pixel of a display device according to another embodiment of the present disclosure.

[0018] Figure 8 is a plan view of a pixel of a display device according to another embodiment of the present disclosure.

[0019] Figure 9 is a cross-sectional view of a sub-pixel of a display device according to the third embodiment of the present disclosure.

[0020] Figure 10 is a cross-sectional view of a sub-pixel of a display device according to the fourth embodiment of the present disclosure.

[0021] Figure 11 is a cross-sectional view of a sub-pixel of a display device according to the fifth embodiment of the present disclosure. Detailed Embodiments

[0022] The advantages, features, and implementation methods of the present disclosure will be clarified by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, 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.

[0023] The shapes, sizes, ratios, angles, and quantities disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples, and thus the present disclosure is not limited to the details of the illustrations. The same reference numerals refer to the same elements throughout. In the following description, when it is determined that a detailed description of related known functions or configurations is not necessary to obscure the focus of the present disclosure, the detailed description may be omitted or briefly provided. In the present disclosure, when "including", "having", and "comprising" are used, other parts may be added unless "only" is used.

[0024] When explaining an element, although not explicitly described, the element is interpreted as including an error range.

[0025] When describing a positional relationship, for example, when the positional relationship is described as "on...", "above...", "below...", and "next to...", one or more other parts may be provided between the two parts, unless "exactly" or "directly" is used.

[0026] It will be understood that although terms such as "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. 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.

[0027] As can be fully understood by those skilled in the art, the features of the various embodiments of the present disclosure may be combined or combined with each other in part or in whole and may be technically driven. The embodiments of the present disclosure may be implemented independently of each other or may be implemented together in a mutually dependent relationship.

[0028] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. All components of the respective display devices according to all embodiments of the present disclosure may be operably combined and configured.

[0029] Figure 1 is a plan view of a display device 10 according to an embodiment of the present disclosure.

[0030] Referring to Figure 1 , the display device 10 according to an embodiment of the present disclosure may include a display area DA and a non-display area NDA surrounding or adjacent to the display area DA. The display area DA is an area where an image can be displayed, and the non-display area NDA is an area where an image is not displayed or may not be displayed.

[0031] The display area DA may include a plurality of pixels P. The plurality of pixels P may be arranged in a matrix form composed of a plurality of rows and columns. However, other arrangements are also possible. In addition, the non-display area NDA may include a plurality of wirings, pads, driving circuits, etc. for driving the plurality of pixels P.

[0032] Figure 2 and Figure 3 is a plan view of a pixel P of a display device according to an embodiment of the present disclosure. The display device may include pixels P each having Figure 2 and Figure 3 the configuration in

[0033] Referring to Figure 2 and Figure 3, a pixel P may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may emit lights different from each other. For example, the first sub-pixel SP1 may emit red light, the second sub-pixel SP2 may emit green light, and the third sub-pixel SP3 may emit blue light, but it is not limited thereto. In addition, although Figure 2 shows that a pixel P includes three sub-pixels SP1 to SP3, the configuration of a pixel P is not limited thereto, and a pixel P may include multiple sub-pixels.

[0034] Each of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 is disposed on the substrate 100, and may include a light-emitting region EA and a non-light-emitting region NEA surrounding or adjacent to the light-emitting region EA. The light-emitting region EA is a region capable of emitting light, and the non-light-emitting region NEA is a region that does not emit light.

[0035] Referring to Figure 2 , a bank BANK may be disposed on the substrate 100. The bank BANK may be disposed in the non-light-emitting region NEA and may surround each of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3.

[0036] The bank BANK may include a trench T. The trench T may be formed by removing a partial region of the bank BANK from the substrate 100. The trench T may have an annular shape surrounding each of the light-emitting regions EA of the first sub-pixel SP1 to the third sub-pixel SP3. For example, the trenches T disposed in each sub-pixel SP may be separated from each other in the boundary region between two adjacent sub-pixels SP.

[0037] Referring to Figure 3 , a first electrode 210 may be disposed on the substrate 100. The first electrode 210 may be disposed in each of the first sub-pixel SP1 to the third sub-pixel SP3. In one sub-pixel SP, the first electrode 210 may be disposed in the light-emitting region EA. In addition, the first electrodes 210 disposed in each of the first sub-pixel SP1 to the third sub-pixel SP3 may be separated from each other.

[0038] The first electrode 210 may extend from the light-emitting region EA and may also be disposed in a part of the non-light-emitting region NEA. Specifically, in one sub-pixel SP, the first electrode 210 may be disposed in the non-light-emitting region NEA between the light-emitting region EA and the trench T. For example, the first electrode 210 may be disposed within the region surrounded by the trench T. In addition, the first electrode 210 may overlap with the trench T.

[0039] The first electrode 210 may include a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). Alternatively, the first electrode 210 may include a metallic material such as aluminum (Al), silver (Ag), copper (Cu), molybdenum (Mo), titanium (Ti), tungsten (W), or chromium (Cr) or an alloy thereof. Further, although shown as a single layer, the first electrode 210 may be formed of multiple layers.

[0040] Figure 4 is a cross-sectional view of a sub-pixel SP of a display device according to a first embodiment of the present disclosure. Figure 4 is Figure 2 and Figure 3 a cross-sectional view of any one of a plurality of sub-pixels shown in. The display device may include sub-pixels SP each having Figure 4 the configuration in.

[0041] Referring to Figure 4 , a sub-pixel SP according to an embodiment of the present disclosure may include a substrate 100, a thin film transistor 110, a passivation layer 120, a first planarization layer 130, a connection electrode 135, a second planarization layer 140, a bank 150, a encapsulation layer 160, and a light emitting device 200.

[0042] The substrate 100 may be formed of glass or plastic, but is not limited thereto. The display device according to an embodiment of the present disclosure may be configured as a top emission type in which light to be emitted is emitted upward. Therefore, as the material of the substrate 100, not only a transparent material but also an opaque material may be used.

[0043] The thin film transistor 110 may be disposed on the substrate 100. The thin film transistor 110 may include a gate electrode 111, a semiconductor layer 112, a gate insulating layer 113, a source electrode 114, and a drain electrode 115.

[0044] The gate electrode 111 of the thin film transistor 110 may be disposed on the substrate 100. Further, the semiconductor layer 112 may be disposed on the gate electrode 111. The semiconductor layer 112 may include a polysilicon semiconductor or an oxide semiconductor. Further, when the semiconductor layer 112 includes an oxide semiconductor, it may include at least one oxide of indium gallium zinc oxide (IGZO), indium zinc oxide (IZO), indium gallium tin oxide (IGTO), and indium gallium oxide (IGO).

[0045] In order to insulate the gate electrode 111 from the semiconductor layer 112, a gate insulating layer 113 may be disposed between the gate electrode 111 and the semiconductor layer 112. The gate insulating layer 113 may include a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) or multiple layers thereof. Further, Figure 5A bottom-gate structure in which a semiconductor layer 112 is disposed on a gate electrode 111 is shown, but is not limited thereto. For example, a top-gate structure in which the gate electrode 111 is disposed on the semiconductor layer 112 may be disclosed.

[0046] A source electrode 114 and a drain electrode 115 may be disposed on the semiconductor layer 112 and face each other. In addition, a passivation layer 120 may be disposed on the source electrode 114 and the drain electrode 115. A contact hole exposing a part of the drain electrode 115 may be formed in the passivation layer 120. In addition, the passivation layer 120 may be formed of an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy).

[0047] A first planarization layer 130 may be disposed on the thin-film transistor 110, and a second planarization layer 140 may be disposed on the first planarization layer 130. The first planarization layer 130 and the second planarization layer 140 may compensate for a step difference caused by the thin-film transistor 110 to flatten an upper region of the thin-film transistor 110. In addition, the first planarization layer 130 and the second planarization layer 140 may be formed of an organic insulating material such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0048] A bank 150 may be disposed on the second planarization layer 140 and the bank 150 may be disposed in a non-emitting area NEA. In addition, the bank 150 may include a first bank 151 and a second bank 152.

[0049] The first bank 151 may be disposed on the second planarization layer 140. Since the first bank 151 is disposed in the non-emitting area NEA, the first bank 151 may expose an upper surface of the first planarization layer 140 corresponding to the emitting area EA. That is, an end portion of the first bank 151 may be disposed in a boundary area between the emitting area EA and the non-emitting area NEA. In addition, a side surface of the first bank 151 may have an inclined surface.

[0050] A trench T may be disposed in an upper surface of the first bank 151. As Figure 3 and Figure 4 described, the trench T may surround the emitting area EA. The trench T may be formed by etching a partial area of the first bank 151. A depth of the trench T may be less than a distance between a flat upper surface and a lower surface of the first bank 151. For example, the trench T may not expose the second planarization layer 140 disposed on a lower surface of the first bank 151. A side surface and a lower surface of the trench T may be formed of the first bank 151.

[0051] A second bank 152 may be provided on the first bank 151. In addition, the second bank 152 may fill the inside of the trench T of the first bank 151. Similar to the first bank 151, since the second bank 152 is provided in the non-emitting area NEA, the second bank 152 may expose the upper surface of the planarization layer 140 corresponding to the emitting area EA. For example, the end of the second bank 152 may be provided in the boundary area between the emitting area EA and the non-emitting area NEA. In addition, the second bank 152 may cover the side surface of the first bank 151. The side surface of the second bank 152 may have an inclined surface. The angle formed by the side surface of the second bank 152 and the substrate 100 may be greater than the angle formed by the side surface of the first bank 151 and the substrate 100.

[0052] The first bank 151 and the second bank 152 may include an organic insulating material such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc. Alternatively, the first bank 151 and the second bank 152 may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), etc. In this case, the first bank 151 may further include a light-absorbing material. For example, the first bank 151 may be a black bank, and the second bank 152 may be a transparent bank.

[0053] The light-emitting device 200 may be provided on the second planarization layer 140. The light-emitting device 200 may include a first electrode 210, a light-emitting layer 220, and a second electrode 230.

[0054] The first electrode 210 is provided on the second planarization layer 140 and may serve as the anode of the display device. The first electrode 210 may be electrically connected to the drain electrode 115 of the thin-film transistor 110 through the connection electrode 135 provided on the first planarization layer 130.

[0055] The first electrode 210 may extend on the second planarization layer 140 exposed through the first bank 151 and the second bank 152, and may also be provided on the upper surface of the first bank 151. For example, the first electrode 210 may be provided in the emitting area EA and the non-emitting area NEA. Specifically, the area of the first electrode 210 corresponding to the emitting area EA may be provided on the upper surface of the second planarization layer 140, and the area of the first electrode 210 corresponding to the non-emitting area NEA may be provided between the first bank 151 and the second bank 152.

[0056] The first electrode 210 may extend into the inside of the trench T on the first bank 151. For example, refer to Figure 4, the first electrode 210 may extend to a part of any one of the two side surfaces of the trench T, but is not limited thereto. The side surface of the trench T on which the first electrode 210 is disposed may be the side surface of the two side surfaces of the trench T adjacent to the light-emitting region EA. For example, referring to Figure 5 , the first electrode 210 may cover the entire one side surface of the trench T and may extend to a part of the lower surface of the trench T.

[0057] The first electrode 210 may include a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). Alternatively, the first electrode 210 may include a metal material such as aluminum (Al), silver (Ag), copper (Cu), molybdenum (Mo), titanium (Ti), tungsten (W), or chromium (Cr) or an alloy thereof. In addition, although shown as a single layer, the first electrode 210 may be formed of multiple layers.

[0058] The light-emitting layer 220 may be disposed on the first electrode 210 and the second bank 152. For example, the light-emitting layer 220 may also be disposed in the light-emitting region EA and the non-light-emitting region NEA. Specifically, the region of the light-emitting layer 220 corresponding to the light-emitting region EA may be disposed on the upper surface of the first electrode 210, and the region of the light-emitting layer 220 corresponding to the non-light-emitting region NEA may be disposed on the upper surface of the second bank 152.

[0059] The light-emitting layer 220 may include a hole transport layer, an organic light-emitting layer, and an electron transport layer. In this case, when a voltage is applied to the first electrode 210 and the second electrode 230, holes and electrons move to the organic light-emitting layer through the hole transport layer and the electron transport layer, respectively, and may combine with each other in the organic light-emitting layer to emit light.

[0060] The second electrode 230 may be disposed on the light-emitting layer 220. The second electrode 230 may be used as the cathode of the display device. Similar to the light-emitting layer 220, the second electrode 230 may be disposed in the light-emitting region EA and the non-light-emitting region NEA.

[0061] Since the display device according to an embodiment of the present disclosure is configured as a top-emitting type, the second electrode 230 may include a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) to transmit the light emitted from the light-emitting layer 220 upward.

[0062] An encapsulation layer 160 may be disposed on the light-emitting device 200. The encapsulation layer 160 may include an organic insulating material such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0063] As described above, the first embodiment of the present disclosure discloses a structure in which the first electrode 210 is disposed between the first bank 151 and the second bank 152 and the first electrode 210 extends into the trench T of the first bank 151.

[0064] Generally, in the process of forming a black bank including a material that absorbs light, outgassing may occur. In this case, when the outgassing penetrates into the light-emitting device, the light-emitting device may be damaged.

[0065] When the black bank is disposed on the anode, since the black bank is adjacent to the boundary region between the anode and the light-emitting layer, the outgassing may penetrate into the boundary region between the anode and the light-emitting layer.

[0066] On the other hand, the first embodiment of the present disclosure discloses a structure in which the first bank 151 is disposed on the second planarization layer 140 and the first electrode 210 is disposed on the first bank 151. Therefore, since the first electrode 210 covers the upper surface and the side surface of the first bank 151, the boundary region between the first electrode 210 and the light-emitting layer 220 can be separated from the first bank 151. Accordingly, it is possible to prevent the outgassing generated in the first bank 151 from penetrating into the boundary region between the first electrode 210 and the light-emitting layer 220.

[0067] In addition, the first embodiment of the present disclosure discloses a structure in which a trench T is provided in the first bank 151 and the first electrode 210 extends into the trench T. Therefore, the path for the outgassing generated in the first bank 151 to move to the boundary region between the first electrode 210 and the light-emitting layer 220 can be further increased. Accordingly, it is possible to further prevent the outgassing generated in the first bank 151 from penetrating into the boundary region between the first electrode 210 and the light-emitting layer 220.

[0068] Figure 6 is a cross-sectional view of a sub-pixel SP of a display device according to a second embodiment of the present disclosure. The display device may include sub-pixels SP each having Figure 6 the configuration in.

[0069] Compared with Figure 4 except for the structure of the trench T and the first electrode 210, Figure 6 substantially the same structure is disclosed. Therefore, the same reference numerals are used for components that are the same as the components of the sub-pixel SP shown in Figure 4 and repeated descriptions are omitted or provided briefly.

[0070] Similar to Figure 4 , Figure 6 a trench T provided in the first bank 151 is disclosed. In this case, Figure 4The structure in which the first bank portion 151 covers the second planarization layer 140 below the trench T is disclosed, while Figure 6 The structure in which a part of the second planarization layer 140 is exposed by the trench T is disclosed. For example, the depth of the trench T may be the same as the distance between the flat upper surface and the lower surface of the first bank portion 151. The side surface of the trench T may be formed by the first bank portion 151, and the lower surface of the trench T may be formed by the second planarization layer 140.

[0071] The first electrode 210 may extend on the second planarization layer 140 exposed to the inside of the trench T by the first bank portion 151 and the second bank portion 152. Referring to Figure 6 , the first electrode 210 may cover the entire one side surface of the trench T and may extend to a part of the lower surface of the trench T. For example, the first electrode 210 may extend to a part of the upper surface of the second planarization layer 140 exposed by the trench T.

[0072] Compared with Figure 4 the first embodiment of Figure 6 the second embodiment of

[0073] Figure 7 discloses a structure in which the depth of the trench T is increased and the first electrode 210 further extends. Accordingly, outgassing generated in the first bank portion 151 can be further prevented from penetrating into the boundary region between the first electrode 210 and the light-emitting layer 220. Figure 7 FIG. is a plan view of one pixel of a display device according to another embodiment of the present disclosure. The display device may include pixels P each having the configuration in

[0074] Compared with Figure 2 and Figure 3 , except for the structures of the first electrode 210 and the protective layer 300, Figure 7 discloses substantially the same structure. Accordingly, the same reference numerals are used for components identical to those of the pixels shown in Figure 2 and Figure 3 , and repeated descriptions are omitted or provided briefly.

[0075] Referring to Figure 7 , the bank BANK may be provided on the substrate 100. In addition, the bank BANK may include trenches T surrounding each of the light-emitting regions EA of the first sub-pixel SP1 to the third sub-pixel SP3.

[0076] The first electrode 210 may be disposed in each of the first sub-pixel SP1 to the third sub-pixel SP3. In one sub-pixel SP, the first electrode 210 may be disposed in the light-emitting region EA. In this case, the first electrode 210 may extend from the light-emitting region EA and may also be disposed in a part of the non-light-emitting region NEA. Specifically, in one sub-pixel SP, the first electrode 210 may be disposed in the non-light-emitting region NEA between the light-emitting region EA and the trench T. For example, the first electrode 210 may be disposed in a region surrounded by the trench T. In addition, the first electrode 210 may be separated from the trench T. For example, the first electrode 210 may not overlap with the trench T.

[0077] A protective layer 300 is disposed in each of the first sub-pixel SP1 to the third sub-pixel SP3, and the protective layer 300 may be disposed on the same layer as the first electrode 210. The protective layer 300 may be in contact with the edge of the first electrode 210 and surround the first electrode 210. In addition, the protective layer 300 may be disposed in the non-light-emitting region NEA. Specifically, the protective layer 300 may be disposed in the non-light-emitting region NEA between the edge of the first electrode 210 and the trench T. For example, the protective layer 300 may be disposed in a region surrounded by the trench T. In addition, the protective layer 300 may overlap with the trench T.

[0078] The protective layer 300 may be formed of an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), etc. In addition, the protective layer 300 may further include a material that absorbs moisture.

[0079] Figure 8 is a plan view of a pixel of a display device according to another embodiment of the present disclosure. The display device may include pixels P each having Figure 8 the configuration in.

[0080] Compared with Figure 7 except for the structures of the trench T and the protective layer 300, Figure 8 substantially the same structure is disclosed. Therefore, the same reference numerals are used for components that are the same as those of the pixels shown in Figure 7 , and repeated descriptions are omitted or briefly provided.

[0081] Figure 7 shows that the trench T is disposed in each of the first sub-pixel SP1 to the third sub-pixel SP3, while Figure 8 shows that the trench T is disposed in the boundary regions between the first sub-pixel SP1 and the second sub-pixel SP2, and between the second sub-pixel SP2 and the third sub-pixel SP3. For example, one trench may be disposed between the first sub-pixel SP1 and the second sub-pixel SP2, and one trench may be disposed between the second sub-pixel SP2 and the third sub-pixel SP3.

[0082] As Figure 7 described in Figure 7 , the protective layer 300 may be disposed in each of the first sub-pixel SP1 to the third sub-pixel SP3, and may be disposed on the same layer as the first electrode 210. The protective layer 300 may contact the edge of the first electrode 210 and surround the first electrode 210. In addition, the protective layer 300 may be disposed in the non-light emitting area NEA. Specifically, the protective layer 300 may be disposed in the non-light emitting area NEA between the edge of the first electrode 210 and the trench T. For example, the protective layer 300 may be disposed in the area surrounded by the trench T. In addition, the protective layer 300 may overlap with the trench T.

[0083] In Figure 8 Figure 8 , since the trench T is disposed in the boundary area between the first sub-pixel SP1 and the second sub-pixel SP2, and the boundary area between the second sub-pixel SP2 and the third sub-pixel SP3, the protective layer 300 may also be disposed in the boundary area between the first sub-pixel SP1 and the second sub-pixel SP2, and the boundary area between the second sub-pixel SP2 and the third sub-pixel SP3.

[0084] For example, the protective layer 300 of the first sub-pixel SP1 and the protective layer 300 of the second sub-pixel SP2 are disposed in the area between the first electrode 210 of the first sub-pixel SP1 and the first electrode 210 of the second sub-pixel SP2, and may contact each other. In addition, the protective layer 300 of the second sub-pixel SP2 and the protective layer 300 of the third sub-pixel SP3 are disposed in the area between the first electrode 210 of the second sub-pixel SP2 and the first electrode 210 of the third sub-pixel SP3, and may contact each other. Therefore, the protective layers 300 of the first sub-pixel SP1 to the third sub-pixel SP3 may be continuously formed without being separated from each other.

[0085] The protective layer 300 may be formed of an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), etc. In addition, the protective layer 300 may further include a material that absorbs moisture.

[0086] Figure 9 is a cross-sectional view of a sub-pixel SP of a display device according to the third embodiment of the present disclosure. The display device may include sub-pixels SP each having Figure 9 the configuration in Figure 9 . A cross-sectional view of any one of the plurality of sub-pixels shown in Figure 7 Figure 7 is shown.

[0087] Compared with Figure 4 Figure 4 , except for the structures of the first electrode 210 and the protective layer 300, Figure 9 Figure 9 discloses substantially the same structure. Therefore, for Figure 4Components identical to those of the sub-pixel SP shown therein are denoted by the same reference numerals, and repeated descriptions are omitted or provided briefly.

[0088] Similar to Figure 4 , Figure 9 A trench T provided in the first bank 151 is disclosed. The trench T can be formed by etching a partial region of the first bank 151. The depth of the trench T can be less than the distance between the flat upper surface and the lower surface of the first bank 151. For example, the trench T may not expose the second planarization layer 140 provided on the lower surface of the first bank 151. The side surface and the lower surface of the trench T can be formed by the first bank 151.

[0089] The first electrode 210 can extend on the second planarization layer 140 exposed by the first bank 151 and the second bank 152, and can also be provided on the upper surface of the first bank 151. For example, the first electrode 210 can be provided in the light-emitting region EA and the non-light-emitting region NEA. Specifically, the region of the first electrode 210 corresponding to the light-emitting region EA can be provided on the upper surface of the second planarization layer 140, and the region of the first electrode 210 corresponding to the non-light-emitting region NEA can be provided between the first bank 151 and the second bank 152.

[0090] The first electrode 210 can be provided on the side surface of the first bank 151. For example, the end portion of the first electrode 210 can be provided on the side surface of the first bank 151, but is not limited thereto. For example, the end portion of the first electrode 210 can extend to the flat upper surface of the first bank 151. In addition, the first electrode 210 may not be provided in the trench T.

[0091] The protective layer 300 can be provided on the first bank 151. For example, the protective layer 300 can be provided in the same layer as the first electrode 210. The protective layer 300 can be in contact with the end portion of the first electrode 210. As Figure 9 shown, when the end portion of the first electrode 210 is provided on the side surface of the first bank 151, the boundary region between the first electrode 210 and the protective layer 300 can be provided on the side surface of the first bank 151.

[0092] The protective layer 300 can extend from the side surface of the first bank 151 to the inside of the trench T. For example, referring to Figure 9 , the protective layer 300 can cover the entire one side surface of the trench T and can extend to a part of the lower surface of the trench T, but is not limited thereto. For example, referring to Figure 10 the fifth embodiment of, the protective layer 300 can cover the entire upper surface of the first bank 151 exposed by the first electrode 210. For example, the protective layer 300 can cover the two side surfaces and the entire lower surface of the trench T.

[0093] The protective layer 300 may be formed of an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), etc. In addition, the protective layer 300 may further include a material that absorbs moisture.

[0094] In summary, Embodiments 3 and 4 of the present disclosure disclose a structure in which the first electrode 210 and the protective layer 300 are disposed between the first bank 151 and the second bank 152 and the protective layer 300 extends into the trench T of the first bank 151.

[0095] Since the protective layer 300 is formed of an inorganic insulating material resistant to moisture, it is possible to preferentially prevent the outgassing generated in the first bank 151 from directly reaching the first electrode 210. In addition, since the protective layer 300 includes a material that absorbs moisture, the amount of outgassing generated can be reduced. Therefore, it is possible to further prevent the outgassing generated in the first bank 151 from penetrating into the boundary region between the first electrode 210 and the light-emitting layer 220.

[0096] Figure 11 is a cross-sectional view of a sub-pixel SP of a display device according to a fifth embodiment of the present disclosure. The display device may include sub-pixels SP each having Figure 11 the configuration in.

[0097] Compared with Figure 9 except for the structure of the trench T and the protective layer 300, Figure 11 substantially the same structure is disclosed. Therefore, the same reference numerals are used for components identical to those of the sub-pixel SP shown in Figure 9 and repeated descriptions are omitted or provided briefly.

[0098] Similar to Figure 9 , Figure 11 a trench T provided in the first bank 151 is disclosed. In this case, Figure 9 a structure in which the first bank 151 covers the second planarization layer 140 below the trench T is disclosed, while Figure 11 a structure in which a part of the second planarization layer 140 is exposed by the trench T is disclosed. For example, the depth of the trench T may be the same as the distance between the flat upper surface and the lower surface of the first bank 151. The side surface of the trench T may be formed by the first bank 151, and the lower surface of the trench T may be formed by the second planarization layer 140.

[0099] The protective layer 300 may extend from the side surface of the first bank 151 into the trench T. Referring to Figure 11 , the protective layer 300 may cover the entire one side surface of the trench T and may extend to a part of the lower surface of the trench T. For example, the protective layer 300 may extend to a part of the upper surface of the second planarization layer 140 exposed by the trench T.

[0100] Compared with Figure 9 the third embodiment of Figure 11 the fifth embodiment of discloses a structure in which the depth of the trench T is increased and the length of the protective layer 300 is further extended. Accordingly, outgassing generated in the first bank 151 can be further prevented from directly reaching the first electrode 210. In addition, outgassing generated in the first bank 151 can be further prevented from penetrating into the boundary region between the first electrode 210 and the light-emitting layer 220.

[0101] According to one or more embodiments of the present disclosure, the following beneficial effects can be obtained.

[0102] According to one or more embodiments of the present disclosure, damage to a light-emitting device caused by outgassing can be prevented.

[0103] It will be apparent to those skilled in the art that the present disclosure described above is not limited to the above embodiments and drawings, and that various substitutions, modifications, and changes can be made to the present disclosure without departing from the spirit or scope of the present disclosure. Accordingly, the scope of the present disclosure is defined by the appended claims and is intended that all variations or modifications derived from the meaning, scope, and equivalent concepts of the claims fall within the scope of the present disclosure.

Claims

1. A display device, comprising: A substrate, on which a plurality of sub-pixels are arranged, wherein the plurality of sub-pixels include a light-emitting region and a non-light-emitting region surrounding or adjacent to the light-emitting region; A planarization layer, the planarization layer being arranged in the light emitting area and the non-light emitting area; a first bank, the first bank being disposed on the planarization layer in the non-light emitting region; a first electrode, the first electrode being disposed on the planarization layer in the light emitting region; as well as a second bank, the second bank being disposed on the first bank, wherein a groove is provided in the upper surface of the first bank, and The first electrode extends to the upper surface of the first bank and is disposed in the groove. 2 . The display device according to claim 1 , wherein the first electrode covers a portion of one side surface of the groove. 3 . The display device according to claim 1 , wherein the first electrode covers the entire one side surface of the trench and extends to a lower surface of the trench. 4 . The display device according to claim 1 , wherein the first electrode is provided between the first bank and the second bank in the non-light emitting region. The display device according to claim 1 , wherein the groove exposes a portion of an upper surface of the planarization layer.

6. A display device, comprising: A substrate, on which a plurality of sub-pixels are arranged, wherein the plurality of sub-pixels include a light-emitting region and a non-light-emitting region surrounding or adjacent to the light-emitting region; A planarization layer, the planarization layer being arranged in the light emitting area and the non-light emitting area; a first bank, the first bank being disposed on the planarization layer in the non-light emitting region; a first electrode, the first electrode being disposed on the planarization layer in the light emitting region; a protective layer, the protective layer being disposed on the first bank; as well as a second bank, the second bank being disposed on the protective layer, A groove is provided in the upper surface of the first bank and the protection layer is provided in the groove.

7. The display device according to claim 6, wherein the first bank exposes an upper surface of the planarization layer corresponding to the light emitting region, and The first electrode extends from an upper surface of the planarization layer corresponding to the light emitting region to an upper surface of the first bank. 8 . The display device according to claim 7 , wherein an end portion of the first electrode is in contact with an end portion of the protective layer on an upper surface of the first bank. 9 . The display device according to claim 7 , wherein the first electrode covers a partial area of ​​an upper surface of the first bank, and the protection layer covers the remaining area of ​​the upper surface of the first bank. 10 . The display device according to claim 8 , wherein the protective layer covers a portion of one side surface of the groove. 11 . The display device according to claim 8 , wherein the protection layer covers the entire one side surface of the groove and extends to a lower surface of the groove.

12. A display device, comprising: A substrate, on which a plurality of sub-pixels are arranged, wherein the plurality of sub-pixels include a light-emitting region and a non-light-emitting region surrounding or adjacent to the light-emitting region; a bank, the bank being arranged in the non-light-emitting area; as well as a first electrode, the first electrode being disposed in the light emitting region, The bank includes a groove surrounding a light emitting region of each of the plurality of sub-pixels.

13. The display device according to claim 12, wherein the plurality of sub-pixels include a first sub-pixel and a second sub-pixel adjacent to each other, and The trench disposed in the first sub-pixel is separated from the trench disposed in the second sub-pixel.

14. The display device according to claim 12, wherein the plurality of sub-pixels include a first sub-pixel and a second sub-pixel adjacent to each other, and The groove is disposed in a boundary region between the first sub-pixel and the second sub-pixel. 15 . The display device according to claim 12 , wherein the first electrode extends from the light emitting region to the non-light emitting region between the light emitting region and the groove. The display device according to claim 15 , wherein the first electrode overlaps the groove.

17. The display device according to claim 15, further comprising a protection layer surrounding the first electrode, and The protection layer contacts the edge of the first electrode. 18 . The display device according to claim 17 , wherein the protective layer is disposed in the non-light emitting region between an edge of the first electrode and the groove, and the protective layer overlaps the groove.

19. The display device according to claim 14, further comprising a protection layer disposed in a boundary region between the first sub-pixel and the second sub-pixel, and The protection layer overlaps with the groove.

20. The display device according to claim 12, wherein the bank is a black bank.

21. The display device according to claim 17 or 19, wherein the protective layer comprises an inorganic insulating material.

22. The display device according to claim 21, wherein the protective layer further comprises a material that absorbs moisture.

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