Display panel

Abstract

A display panel is provided, including: a light emitting element layer including a pixel definition layer and a light emitting element, the pixel definition layer having an opening defined by the pixel definition layer, the light emitting element disposed in the opening. The pixel definition layer includes first barrier portions and second barrier portions spaced apart from each other in a first direction to define first spaces having a first length in the first direction. A first inorganic layer covers the light emitting element layer. The first inorganic layer includes an uneven upper surface corresponding to the first spaces. An organic layer is in contact with the upper surface of the first inorganic layer. First recesses are defined by the upper surface of the first inorganic layer superimposed with the first spaces. A thickness of the first inorganic layer superimposed with the first spaces varies. The organic layer fills in the first recesses.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2020-0105897, filed on August 24, 2020, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] This invention relates to a display panel. More specifically, this invention relates to a display panel with improved reliability. Background Technology

[0003] Various multimedia electronic devices include display devices that provide images to users (such as televisions, mobile phones, tablet computers, laptop computers, gaming units, etc.). To improve user convenience and portability, various flexible display devices (such as rollable display devices, foldable display devices, etc.) are being developed.

[0004] Display devices include display panels, such as liquid crystal display panels, organic light-emitting diode display panels, and miniature light-emitting diode display panels.

[0005] However, in rollable or foldable display devices, delamination defects occur between the stacked components of the display panel due to bending. Therefore, research is underway to reduce or prevent delamination defects in the stacked components. Summary of the Invention

[0006] The present invention provides a display panel that reduces or prevents delamination defects between its stacked components and has improved reliability.

[0007] According to an embodiment of the present invention, a display panel includes: a light-emitting element layer, comprising a pixel-defining layer having an opening defined therethrough, and a light-emitting element disposed in the opening. The pixel-defining layer includes a first blocking portion and a second blocking portion spaced apart from each other in a first direction to define a first space having a first length in the first direction. A first inorganic layer covers the light-emitting element layer. The first inorganic layer includes an uneven upper surface corresponding to the first space. An organic layer contacts the upper surface of the first inorganic layer. A first groove is defined by the upper surface of the first inorganic layer superimposed on the first space. The thickness of the first inorganic layer superimposed on the first space varies. The organic layer fills the first groove.

[0008] In one embodiment, the first inorganic layer superimposed on the first space includes a first portion disposed substantially parallel to the light-emitting element layer, a second portion bent from the first portion, and a third portion bent from the first portion, spaced apart from the second portion, and facing the second portion. The upper portion of each of the second and third portions has a greater thickness than the lower portion of each of the second and third portions.

[0009] In one embodiment, the width of the upper part of the first groove is smaller than the width of the lower part of the first groove.

[0010] In one embodiment, the display panel further includes a third blocking portion that, together with the first blocking portion, defines a second space having a second length in a second direction intersecting the first direction, and the second length is greater than the first length.

[0011] In one embodiment, the second groove is defined by the upper surface of the first inorganic layer superimposed on the second space, and the upper width of the second groove is greater than the upper width of the first groove.

[0012] In this embodiment, the first space and the second space are integrated together.

[0013] In one embodiment, the width of the upper part of the second groove is equal to or greater than the width of the lower part of the second groove.

[0014] In this embodiment, the first groove and the second groove are integrally formed with each other.

[0015] In the embodiments, each of the first blocking portion and the second blocking portion has a triangular shape, a quadrilateral shape, or a sector shape in a plane.

[0016] In one embodiment, the first blocking portion includes a lower surface and a first side surface, and the second blocking portion includes a lower surface and a second side surface facing the first side surface. Each of the angles between the lower surface of the first blocking portion and the first side surface, and the angles between the lower surface of the second blocking portion and the second side surface, is equal to or greater than about 45 degrees and less than about 180 degrees.

[0017] In one embodiment, the first side surface is parallel to the second side surface.

[0018] In one embodiment, the pixel defining layer further includes a substrate portion that contacts the lower surface of each of the first blocking portion and the second blocking portion, and the substrate portion is provided with an opening defined therethrough.

[0019] In this embodiment, the first blocking portion and the second blocking portion are integrally disposed with the base portion.

[0020] In an embodiment, each of the first blocking portion and the second blocking portion is configured as a plurality, and the plurality of first blocking portions and the plurality of second blocking portions have a patterned shape in a plane.

[0021] In the embodiment, the first space and the second space have a radial shape relative to an imaginary center in the plane.

[0022] In an embodiment, the light-emitting element includes a first electrode, a light-emitting layer, and a second electrode. At least a portion of the first electrode is exposed through an opening. The light-emitting layer is disposed on the first electrode, and the second electrode is disposed on the light-emitting layer. The second electrode is disposed on a pixel defining layer to correspond to the shape of the upper surface of the pixel defining layer.

[0023] In an embodiment, the light-emitting element further includes a hole control layer disposed between the first electrode and the light-emitting layer and an electronic control layer disposed between the light-emitting layer and the second electrode.

[0024] In one embodiment, the display panel further includes a second inorganic layer disposed on the organic layer.

[0025] In one embodiment, the display panel further includes a foldable substrate layer disposed beneath the light-emitting element layer.

[0026] According to an embodiment of the present invention, a display panel includes: a light-emitting element layer, comprising a pixel defining layer having an opening defined therethrough and a light-emitting element disposed in the opening. The pixel defining layer includes a plurality of blocking portions spaced apart from each other to form a predetermined space. A first inorganic layer covers the light-emitting element layer and is configured to correspond to the predetermined space. An organic layer is in direct contact with the upper surface of the first inorganic layer. A second inorganic layer is disposed on the organic layer. The plurality of blocking portions includes a first blocking portion and a second blocking portion spaced apart from the first blocking portion. The first blocking portion includes a first side surface, and the second blocking portion includes a second side surface facing the first side surface. The first inorganic layer disposed on the first side surface of the first blocking portion and the second side surface of the second blocking portion has a thickness greater at its upper portion than at its lower portion.

[0027] According to an embodiment of the present invention, a display panel includes: a light-emitting element layer, comprising a pixel-defining layer having an opening defined therethrough and a light-emitting element disposed in the opening. The pixel-defining layer includes a plurality of blocking portions spaced apart from each other to form a predetermined space. Adjacent blocking portions of the plurality of blocking portions form a plurality of blocking groups. A first inorganic layer covers the light-emitting element layer and is configured to correspond to the predetermined space. Each of the plurality of blocking groups includes at least one first groove defined by an upper surface of the first inorganic layer superimposed with the predetermined space. The at least one first groove has an upper surface having a width smaller than the width of a lower surface of the at least one first groove. An organic layer is in direct contact with the upper surface of the first inorganic layer and fills the at least one first groove.

[0028] Based on the above, delamination defects that occur between stacked components of the display panel due to repeated folding and unfolding operations can be reduced or prevented. Attached Figure Description

[0029] The above and other advantages of the inventive concept will readily become apparent when considered in conjunction with the accompanying drawings, and with reference to the following detailed description, in which:

[0030] Figure 1A This is a perspective view showing a display panel according to an embodiment of the concept of the present invention;

[0031] Figure 1B This illustrates an embodiment based on the concept of the present invention. Figure 1A The perspective view shown is of the display panel in a folded state;

[0032] Figure 1C This illustrates an embodiment of the invention in a folded state. Figure 1B A cross-sectional view of the display panel shown;

[0033] Figure 2 This is a cross-sectional view illustrating a display panel according to an embodiment of the concept of the present invention;

[0034] Figure 3 This is a plan view illustrating a display panel according to an embodiment of the concept of the present invention;

[0035] Figure 4A It is along Figure 3 The line I-I' shows a cross-sectional view of a portion of a display panel according to an embodiment of the concept of the present invention;

[0036] Figure 4B It is along Figure 3 The line I-I' shows a cross-sectional view of a portion of a display panel according to an embodiment of the concept of the present invention;

[0037] Figure 5A This is a cross-sectional view showing a portion of a display panel according to an embodiment of the concept of the present invention;

[0038] Figure 5B This is a cross-sectional view showing a portion of a display panel according to an embodiment of the concept of the present invention;

[0039] Figure 6 It is along Figure 3 The section cut by line II-II' shows a cross-sectional view of a portion of a display panel according to an embodiment of the present disclosure;

[0040] Figure 7A This is a cross-sectional view showing a portion of a display panel according to an embodiment of the concept of the present invention;

[0041] Figure 7B This is a cross-sectional view showing a portion of a display panel according to an embodiment of the concept of the present invention;

[0042] Figure 8AThis is a plan view illustrating a pixel-defining layer according to an embodiment of the concept of the present invention;

[0043] Figure 8B This is a plan view illustrating a pixel-defining layer according to an embodiment of the concept of the present invention; and

[0044] Figure 8C This is a plan view illustrating a pixel-defining layer according to an embodiment of the concept of the present invention. Detailed Implementation

[0045] In the present invention, it will be understood that when an element or layer is referred to as being "on" another element or layer, "connected to", or "bonded to" another element or layer, the element or layer may be directly on, directly connected to, or directly bonded to the other element or layer, or there may be intermediate elements or layers. When an element or layer is referred to as being "directly on" another element or layer, "directly connected to", or "directly bonded to" another element or layer, there may be no intermediate elements.

[0046] The same reference numerals always denote the same elements. In the drawings, the thickness, scale, and dimensions of components may be exaggerated for the purpose of effectively describing the inventive concept. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] It will be understood that although the terms first, second, etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or portion from another region, layer, or portion. Therefore, without departing from the teachings of the inventive concept, the first element, component, region, layer, or portion discussed below may be referred to as the second element, component, region, layer, or portion. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are also intended to include the plural forms.

[0048] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “up,” etc., may be used to describe the relationship between one element or feature and another (other elements or features) as shown in the accompanying drawings.

[0049] It will also be understood that when the term "comprising" and / or variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or groups thereof.

[0050] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concept pertains. It will also be understood that terms (such as those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formalized sense, unless expressly defined herein.

[0051] The concept of the invention will be explained in detail below with reference to the accompanying drawings.

[0052] Figure 1A This is a perspective view showing a display panel DP according to an embodiment of the present invention. Figure 1B It is shown Figure 1A The perspective view shown is of the display panel DP in a folded state. Figure 1C It indicates that it is in a folded state. Figure 1B The image shows a cross-sectional view of the display panel DP.

[0053] The display panel (DP) according to embodiments of the present invention can be a device that is activated in response to an electrical signal to display an image. In embodiments, the display panel (DP) can be applied to various electronic devices, such as mobile phones, laptops, tablets, navigation units, gaming units, or televisions. However, embodiments of the present invention are not limited thereto, and the display panel (DP) can be applied to other small, medium, or large electronic devices.

[0054] Reference Figure 1A In one embodiment, the display panel DP may have a rectangular shape with a relatively short side in a first direction DR1 and a relatively long side in a second direction DR2 intersecting the first direction DR1. The upper surface of the display panel DP may be defined as a display surface IS. The display surface IS may extend in a plane defined by the first direction DR1 and the second direction DR2. However, embodiments of the inventive concept are not limited to this, and the shape of the display panel DP may have various shapes, and the display surface IS may extend in one or more planes extending in various different directions.

[0055] The display surface IS may include a display area DA and a non-display area NDA adjacent to the display area DA. The display area DA may be an area in which an image IM is displayed, and the non-display area NDA may be an area in which an image IM is not displayed. In an embodiment, the image IM may be at least one moving and / or stationary image. Figure 1A In some embodiments, the image IM is a software application icon, as well as a clock, temperature, and calendar window. However, embodiments of the inventive concept are not limited to this, and the image IM can have a variety of different themes.

[0056] like Figure 1A As shown in the embodiments, the display area DA can have a rectangular shape. The non-display area NDA can surround the display area DA. For example, as... Figure 1A As shown in the embodiments, the non-display area NDA can completely surround the display area DA (e.g., completely surround the display area DA in the first direction DR1 and the second direction DR2). However, the embodiments of the inventive concept are not limited to this. For example, the shape of the display area DA and the shape of the non-display area NDA can have various different shapes. Furthermore, the non-display area NDA may not surround one or more sides of the display area DA. For example, the non-display area NDA may only be adjacent to one side of the display area DA, or it may be omitted.

[0057] Simultaneously, the upper (or front) surface and lower (or rear) surface of each component are defined relative to the image IM along its display direction. The front and rear surfaces are opposite each other on the third direction DR3, and the normal direction of each of the front and lower surfaces may be substantially parallel to the third direction DR3.

[0058] The directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 can be opposite to each other and can be changed to other directions. In the following text, the first direction, the second direction, and the third direction are assigned the same reference numerals as those for the first direction DR1, the second direction DR2, and the third direction DR3.

[0059] The display panel DP of this invention can be flexible. For example, the display panel DP can be flexible, and can be fully bent or bent at a scale of a few nanometers. For example, the display panel DP can be a curved display panel or a foldable display panel. However, embodiments of this invention are not limited thereto. For example, in some embodiments, the display panel DP can be rigid.

[0060] like Figures 1A to 1C As shown in the embodiments, the display panel DP according to the embodiments can be folded or unfolded about a folding axis FX extending in one direction. The display panel DP can be folded inward (inward folding) or outward (outward folding) about the folding axis FX. Figure 1A The embodiment shows an unfolded display panel DP. Figure 1B and Figure 1C The embodiment illustrates an inwardly folding (inwardly folding) display panel DP.

[0061] In this embodiment, the folding axis FX may extend along one direction of the display panel DP. For example, as... Figures 1A to 1CAs shown in the embodiments, the folding axis FX may correspond to an axis that is substantially parallel to the relatively shorter side of the display panel DP (e.g., the axis of the first direction DR1). However, embodiments of the inventive concept are not limited to this or thus restricted, and the folding axis may correspond to an axis that is substantially parallel to the relatively longer side of the display panel DP (e.g., the axis of the second direction DR2), or may extend along the diagonal between the first direction DR1 and the second direction DR2, etc.

[0062] The display panel DP may include a folded region FA and a first non-folded region NFA1 and a second non-folded region NFA2. The folded region FA undergoes a shape change relative to the folding axis FX. The first non-folded region NFA1 and the second non-folded region NFA2 are adjacent to both ends of the folded region FA, such that the folded region FA is positioned between the first non-folded region NFA1 and the second non-folded region NFA2. (Refer to...) Figure 1A In one embodiment, the display panel DP may include a first non-folding region NFA1 that is substantially parallel to the folding axis FX and adjacent to one side of the folding region FA (e.g., one side in the second direction DR2), and a second non-folding region NFA2 that is substantially parallel to the folding axis FX and adjacent to the other side of the folding region FA (e.g., the other side in the second direction DR2). Figures 1A to 1C The embodiment shown illustrates a folded region FA. However, embodiments of the present invention are not limited thereto, and the display panel DP may include multiple folded regions FA defined therein.

[0063] Reference Figure 1B In one embodiment, the display panel DP can be folded inward (inward folding) around the folding axis FX. When the display panel DP is folded inward (inward folding), the display surfaces IS of the first non-folded region NFA1 and the second non-folded region NFA2 face each other. Therefore, the rear surface of the display panel DP opposite to the display surface IS of the display panel DP can be exposed to the outside, and the display surface IS of the display panel DP can be protected from external impacts.

[0064] Simultaneously, the display panel DP can be folded outward around the folding axis FX (outward folding). When the display panel DP is folded outward, the display surfaces IS of the first non-folded area NFA1, the second non-folded area NFA2, and the folded area FA can be exposed to the outside. The image IM can be displayed through the display surfaces IS exposed to the outside of the outwardly folded display panel DP.

[0065] Reference Figure 1C In one embodiment, the display panel DP may include a display module DM and a TFE encapsulation layer. The TFE encapsulation layer may be disposed on the display module DM. The TFE encapsulation layer may cover the display module DM.

[0066] Figure 1C A cross-section of an inwardly folded display panel DP is shown, where the upper surfaces of the display modules DM can face each other on the third direction DR3, and the encapsulation layers TFE can also face each other on the third direction DR3. The folded display panel DP can have a predetermined radius of curvature RR relative to the folding axis FX. The stress applied to the folded region FA can vary depending on the value of the radius of curvature RR, and due to the stress, delamination defects may occur between the interfaces of each component of the display panel DP.

[0067] The display panel DP according to the present invention can reduce or prevent delamination defects between the display module DM and the encapsulation layer TFE covering the display module DM. Therefore, despite repeated folding and unfolding operations, the display module DM and the encapsulation layer TFE are not easily separated from each other, and the reliability of the display panel DP can be improved. The display module DM and the encapsulation layer TFE will be described in detail later.

[0068] Figure 2 This is a cross-sectional view illustrating a display panel DP according to an embodiment of the present invention. In the embodiment, the display panel DP can be a light-emitting display panel. For example, the display panel DP can be a liquid crystal display panel, an organic electroluminescent display panel, or a quantum dot light-emitting display panel. However, the embodiments of the present invention are not limited thereto. Hereinafter, for ease of explanation, the display panel DP will be described as an organic electroluminescent display panel.

[0069] like Figure 2 As shown in the embodiments, the display panel DP may include a substrate layer BL, a circuit layer DP-CL, a light-emitting element layer DP-LE, and a packaging layer TFE, which are sequentially stacked on the third-direction DR3. The display panel DP may include multiple light-emitting regions PXA and a peripheral region NPXA surrounding the light-emitting regions PXA.

[0070] In some embodiments, the substrate layer BL may be a flexible substrate and can be folded and unfolded. In some embodiments, the substrate layer BL may include a synthetic resin substrate. The synthetic resin substrate may include at least one material selected from polyimide resins, acrylic resins, methacrylic resins, polyisoprene resins, vinyl resins, epoxy resins, polyurethane resins, cellulose resins, siloxane resins, polyamide resins, and perylene resins. However, embodiments of the present invention are not limited thereto or thereby. In some embodiments, the substrate layer BL may include a glass substrate, a metal substrate, or an organic / inorganic composite material, and the substrate layer BL may be rigid.

[0071] The circuit layer DP-CL can be disposed on the substrate layer BL (e.g., directly disposed on the substrate layer BL on a third-direction DR3). In embodiments, the circuit layer DP-CL may include at least one insulating layer and circuit elements. The circuit elements may include signal lines and pixel driving circuitry. In embodiments, the insulating layer, semiconductor layer, and conductive layer can be formed by a coating process or a deposition process, and then the insulating layer, semiconductor layer, and conductive layer can be patterned by several photolithography processes to form the circuit layer DP-CL. However, embodiments of the present invention are not limited thereto.

[0072] like Figure 2 As shown in the embodiments, the circuit layer DP-CL may include a buffer layer BFL, multiple insulating layers (such as a first insulating layer 10, a second insulating layer 20, and a third insulating layer 30), and multiple transistors TR. Figure 2 The embodiment shown illustrates two transistors TR. However, the embodiments of the present invention are not limited to this, and the number of transistors TR can vary.

[0073] The buffer layer BFL can be disposed on the substrate layer BL (e.g., directly disposed on the substrate layer BL on a third-direction DR3). The buffer layer BFL can be formed on the upper surface of the substrate layer BL. The buffer layer BFL may include at least one inorganic layer. In embodiments, the inorganic layer may include at least one compound selected from alumina, titanium oxide, silicon oxide, silicon oxynitride, zirconium oxide, and hafnium oxide. The buffer layer BFL may have a multilayer structure in which silicon oxide layers and silicon oxynitride layers are stacked alternately. However, embodiments of the present invention are not limited thereto, and the materials used for the buffer layer BFL may vary.

[0074] Semiconductor patterns can be disposed on the buffer layer BFL (e.g., directly on the buffer layer BFL on a third-direction DR3). The buffer layer BFL can increase the adhesion between the substrate layer BL and the semiconductor pattern. In embodiments, the semiconductor pattern may include polycrystalline silicon, amorphous silicon, or metal oxide. However, embodiments of the present invention are not limited thereto.

[0075] Figure 2 The arrangement of the active body AD, source SD, drain DD, and gate GD forming the transistor TR is shown. The active body AD, source SD, and drain DD can be different from each other by the doping concentration or conductivity of the semiconductor pattern.

[0076] The first insulating layer 10 may be disposed on the buffer layer BFL (e.g., directly disposed on the buffer layer BFL on the third-direction DR3). The first insulating layer 10 may cover the semiconductor pattern. In embodiments, the first insulating layer 10 may be an inorganic layer and / or an organic layer, and may have a single-layer structure or a multilayer structure.

[0077] The gate GD may be disposed on the first insulating layer 10 (e.g., directly disposed on the first insulating layer 10 on the third-direction DR3). In an embodiment, the gate GD may be part of a metal pattern. The gate GD may be stacked with the active body AD (e.g., stacked with the active body AD on the third-direction DR3).

[0078] The second insulating layer 20 may be disposed on the first insulating layer 10 (e.g., directly disposed on the first insulating layer 10 on the third-direction DR3) and may cover the gate GD. In embodiments, the second insulating layer 20 may be an inorganic layer and / or an organic layer, and may have a single-layer structure or a multi-layer structure.

[0079] The third insulating layer 30 may be disposed on the second insulating layer 20 (e.g., directly disposed on the second insulating layer 20 on the third-direction DR3). In embodiments, the third insulating layer 30 may be an inorganic layer and / or an organic layer, and may have a single-layer structure of silicon oxide layer.

[0080] In embodiments, each of the first insulating layer 10, the second insulating layer 20, and the third insulating layer 30 may include at least one compound selected from alumina, titanium oxide, silicon oxide, silicon oxynitride, zirconium oxide, and hafnium oxide. However, embodiments of the present invention are not limited thereto, and the materials used for the first insulating layer 10, the second insulating layer 20, and the third insulating layer 30 may vary.

[0081] The light-emitting element layer DP-LE can be disposed on the circuit layer DP-CL (e.g., directly disposed on the circuit layer DP-CL on a third-party DR3). The light-emitting element layer DP-LE may include a light-emitting element LE and a pixel-defining layer PDL. The pixel-defining layer PDL may include an opening OP defined therethrough, and the light-emitting element LE may be disposed superimposed on the opening OP. The light-emitting element LE may be disposed within the opening OP.

[0082] The light-emitting element LE may include a first electrode AE, a second electrode CE, and a light-emitting layer EML disposed between the first electrode AE ​​and the second electrode CE (e.g., disposed between the first electrode AE ​​and the second electrode CE on a third-direction DR3). The light-emitting element LE may also include a functional layer disposed between the light-emitting layer EML and each of the first electrode AE ​​and the second electrode CE. For example, in... Figure 2 In some embodiments, the light-emitting element LE may include a first electrode AE, a second electrode CE, a light-emitting layer EML, a hole control layer HCL, and an electron control layer ECL. However, embodiments of the present invention are not limited thereto, and the functional layers included in the light-emitting element LE may vary.

[0083] The first electrode AE ​​can be disposed on the third insulating layer 30 (e.g., directly disposed on the third insulating layer 30 on the third-direction DR3). The first electrode AE ​​can be directly or indirectly connected to the transistor TR. At least a portion of the first electrode AE ​​can be exposed by an opening OP defined by the pixel defining layer PDL. For example, as Figure 2 As shown in the embodiment, the central portion of the first electrode AE ​​(e.g., the central portion in the first direction DR1) can be exposed by the opening OP.

[0084] The light-emitting layer EML can be disposed between the first electrode AE ​​and the second electrode CE (e.g., disposed between the first electrode AE ​​and the second electrode CE on a third-direction DR3). In an embodiment, the light-emitting layer EML can be activated according to the potential difference between the first electrode AE ​​and the second electrode CE, and can generate light. The light generated by the light-emitting layer EML can be emitted through the upper surface of the display panel DP. For example, the generated light can be blue light. However, embodiments of the present invention are not limited thereto.

[0085] like Figure 2 As shown in the embodiments, the light-emitting element LE may include a hole control layer HCL disposed between the first electrode AE ​​and the light-emitting layer EML (e.g., disposed between the first electrode AE ​​and the light-emitting layer EML on a third-direction DR3) and an electron control layer ECL disposed between the second electrode CE and the light-emitting layer EML (e.g., disposed between the second electrode CE and the light-emitting layer EML on a third-direction DR3). The hole control layer HCL may include at least one of a hole transport layer and a hole injection layer. The electron control layer ECL may include at least one of an electron transport layer and an electron injection layer.

[0086] The pixel limiting layer (PDL) can be disposed on the circuit layer DP-CL. The pixel limiting layer (PDL) can also be disposed on the third insulating layer 30 included in the circuit layer DP-CL. For example, as... Figure 2 As shown in the embodiments, the lower part of the pixel defining layer PDL can directly contact the upper surface of the third insulating layer 30 and the side end of the first electrode AE. In the embodiments, the opening OP defined by the pixel defining layer PDL can be multiple, and the opening OP can be stacked with the light-emitting region PXA respectively (e.g., stacked with the light-emitting region PXA respectively on the third-direction DR3). The pixel defining layer PDL can be stacked with the peripheral region NPXA (e.g., stacked with the peripheral region NPXA on the third-direction DR3). In the embodiments, the pixel defining layer PDL may include an organic layer.

[0087] The pixel defining layer (PDL) may include a base portion BS and multiple blocking portions (such as a first blocking portion BK1 and a second blocking portion BK2). The lower surfaces of the first blocking portion BK1 and the second blocking portion BK2 may be in direct contact with the base portion BS, which includes an opening OP defined therethrough. The first blocking portion BK1 and the second blocking portion BK2 may be spaced apart from each other (e.g., spaced apart from each other in a first direction DR1) to form a space. However, embodiments of the inventive concept are not limited thereto, and the construction of the pixel defining layer (PDL) may vary. For example, in embodiments, the base portion BS included in the pixel defining layer (PDL) may be omitted.

[0088] The emissive layer EML can be commonly disposed within the emissive region PXA, or it can be disposed independently within the emissive region PXA. The phrase "discretely disposed" means that the emissive layer EML is divided into multiple discrete parts, and as... Figure 2 As shown in the embodiments, the portions are respectively disposed in the light-emitting region PXA to be separate from each other. The expression "commonly disposed" means that the light-emitting layer EML is commonly disposed in the light-emitting region PXA and the peripheral region NPXA, rather than disposed separately.

[0089] like Figure 2 As shown in the embodiments, the hole control layer HCL, the electron control layer ECL, and the second electrode CE can be commonly disposed in the light-emitting region PXA and the peripheral region NPXA. The commonly disposed hole control layer HCL, electron control layer ECL, and second electrode CE can be defined as a common layer EL. The common layer EL can be disposed on the pixel defining layer PDL, and the common layer EL can be formed as a non-uniform upper surface corresponding to the pixel defining layer PDL. For example, as... Figure 2 As shown in the embodiments, the hole control layer HCL, the electron control layer ECL, and the second electrode CE can correspond to the shape of the uneven upper surface of the pixel defining layer PDL. However, embodiments of the present invention are not limited thereto, and the elements of the common layer EL can vary.

[0090] The encapsulation layer TFE can be disposed on the light-emitting element layer DP-LE (e.g., directly disposed on the light-emitting element layer DP-LE on a third-party DR3). The encapsulation layer TFE can encapsulate the light-emitting element layer DP-LE. The encapsulation layer TFE may include at least one insulating layer. In embodiments, the encapsulation layer TFE may include at least one organic layer and at least one inorganic layer. For example, such as... Figure 2 As shown in the embodiments, the encapsulation layer TFE may include a first inorganic layer IO1, an organic layer MN, and a second inorganic layer IO2 sequentially stacked on the light-emitting element layer DP-LE on the third-party DR3.

[0091] The first inorganic layer IO1 and the second inorganic layer IO2 can protect the light-emitting element layer DP-LE from oxygen and moisture, and the organic layer MN can protect the light-emitting element layer DP-LE from foreign matter such as dust particles. For example, in an embodiment, the first inorganic layer IO1 and the second inorganic layer IO2 may include a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. However, the embodiments of the present invention are not limited thereto. In an embodiment, the organic layer MN may include an acrylic organic layer. However, the embodiments of the present invention are not limited thereto.

[0092] The first inorganic layer IO1 can be disposed on the common layer EL. For example, the lower surface of the first inorganic layer IO1 can be in direct contact with the common layer EL. Figure 2 As shown in the embodiment, the first inorganic layer IO1 can be in direct contact with the second electrode CE, which is disposed in a common area. An organic layer MN can be disposed on the first inorganic layer IO1. For example, the organic layer MN can be directly disposed on the first inorganic layer IO1, and the upper surface of the first inorganic layer IO1 can be in direct contact with the organic layer MN.

[0093] In the comparative embodiment, when the display panel is folded, the light-emitting element layer and the encapsulation layer, or the inorganic and organic layers of the encapsulation layer, may separate from each other due to the stress applied to the folded area. However, the display panel DP of the present invention can reduce or prevent delamination defects between the light-emitting element layer DP-LE and the encapsulation layer TFE, and between the first inorganic layer IO1 and the organic layer MN of the encapsulation layer TFE.

[0094] The horizontal level of the upper surface of the pixel-defining layer PDL (e.g., the distance from the upper surface of the substrate layer BL on the third-direction DR3) may be non-uniform due to the first blocking portion BK1 and the second blocking portion BK2, and the predetermined space defined by the first blocking portion BK1 and the second blocking portion BK2. The first inorganic layer IO1 may include a curved upper surface corresponding to the shape of the curved upper surface of the pixel-defining layer PDL. By covering the first blocking portion BK1 and the second blocking portion BK2 of the pixel-defining layer PDL, the first inorganic layer IO1 can be deposited in various shapes, thereby reducing or preventing delamination defects between the light-emitting element layer DP-LE and the encapsulation layer TFE, as well as delamination defects between stacked components in the encapsulation layer TFE.

[0095] Figure 3 This is a plan view illustrating a display panel DP according to an embodiment of the present invention. For ease of explanation, Figure 3 A plan view of the pixel-defined layer (PDL) is shown, and the portions corresponding to the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 are shaded in the illustration. The common layer EL, the first inorganic layer IO1, and the organic layer MN are set... Figure 3 The pixel-defining layer (PDL) is shown in the embodiment.

[0096] The luminescent area (PXA) can be divided into multiple groups based on the color of the light emitted from the display panel (DP). For example, ... Figure 3 As shown in the embodiments, the display panel DP may include three light-emitting areas, such as a first light-emitting area PXA1 emitting blue light, a second light-emitting area PXA2 emitting red light, and a third light-emitting area PXA3 emitting green light, respectively. However, the embodiments of the present invention are not limited to this, and the number of light-emitting areas and the color of light emitted by the light-emitting areas may vary. In the embodiments, the light-emitting areas may include a first light-emitting area PXA1 emitting blue light, a second light-emitting area PXA2 emitting red light, and a third light-emitting area PXA3 emitting green light.

[0097] The first emitting region PXA1, the second emitting region PXA2, and the third emitting region PXA3 can be spaced apart from each other in a plane (e.g., a plane defined in the first direction DR1 and the second direction DR2). The first emitting region PXA1, the second emitting region PXA2, and the third emitting region PXA3 can be separated from each other by a pixel defining layer PDL. The peripheral region NPXA can be the area between the adjacent first emitting regions PXA1, the second emitting region PXA2, and the third emitting region PXA3, and can correspond to the pixel defining layer PDL. The peripheral region NPXA can serve as the boundary between the first emitting regions PXA1, the second emitting region PXA2, and the third emitting region PXA3, and can prevent the colors of the light emitted from the first emitting region PXA1, the second emitting region PXA2, and the third emitting region PXA3 from mixing with each other.

[0098] like Figure 3 As shown in the embodiments, the first emitting region PXA1, the second emitting region PXA2, and the third emitting region PXA3 may have different sizes depending on the wavelength range of the light emitted from them. The sizes of the first emitting region PXA1, the second emitting region PXA2, and the third emitting region PXA3 may indicate their areas in a plane defined by the first direction DR1 and the second direction DR2. However, the embodiments of the inventive concept should not be limited thereto or thereby restricted, and the sizes of two or more of the first emitting region PXA1, the second emitting region PXA2, and the third emitting region PXA3 may be substantially similar to each other.

[0099] In this embodiment, the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3 can be arranged in a pentile pattern. (See also...) Figure 3In one embodiment, the first luminescent region PXA1 and the second luminescent region PXA2 may be arranged alternately on the first direction DR1 and the second direction DR2, and the third luminescent region PXA3 may be substantially disposed in the region between the first luminescent regions PXA1 and the second luminescent region PXA2 along a diagonal direction (e.g., between the first direction DR1 and the second direction DR2 and perpendicular to the third direction DR3). However, embodiments of the present invention are not limited thereto, and the arrangement of the first luminescent region PXA1, the second luminescent region PXA2, and the third luminescent region PXA3 may vary. For example, in one embodiment, the first luminescent region PXA1, the second luminescent region PXA2, and the third luminescent region PXA3 may be arranged in a striped pattern or a diamond pattern.

[0100] The pixel-defined layer (PDL) may have multiple openings, such as a first opening OP1, a second opening OP2, and a third opening OP3. The first opening OP1, the second opening OP2, and the third opening OP3 may correspond to the shapes of the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3 in a plane (e.g., in a plane defined by the first direction DR1 and the second direction DR2). Figure 3 The pixel-defining layer (PDL) shown in the embodiment may be provided with a first opening OP1 corresponding to the shape of the first light-emitting region PXA1, a second opening OP2 corresponding to the shape of the second light-emitting region PXA2, and a third opening OP3 corresponding to the shape of the third light-emitting region PXA3. However, the shapes of the first opening OP1, the second opening OP2, and the third opening OP3 should not be limited to... Figure 3 The shapes of the first opening OP1, the second opening OP2, and the third opening OP3 shown in the embodiments can be varied (e.g., varied according to the shape of the light-emitting area).

[0101] A pixel-limiting layer (PDL) may include multiple blocking portions. Some of these blocking portions may be positioned adjacent to each other. Figure 3 The embodiment illustrates a first blocking portion BK1, a second blocking portion BK2, a third blocking portion BK3, and a fourth blocking portion BK4 arranged adjacent to each other (e.g., the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 arranged adjacent to each other in the first direction DR1 and / or the second direction DR2). However, the number of blocking portions arranged adjacent to each other should not be limited to this, as long as the pixel defining layer PDL includes blocking portions that are spaced apart from each other while defining a predetermined space.

[0102] like Figure 3As shown in the embodiments, the pixel defining layer PDL may include a first blocking portion BK1 and a second blocking portion BK2 spaced apart from each other by a predetermined distance in the first direction DR1 to form a space. The pixel defining layer PDL may also include a third blocking portion BK3 spaced apart from the first blocking portion BK1 by a predetermined distance in the second direction DR2 to form a space.

[0103] In the space defined by the blocking portions, the distance between the blocking portions can vary depending on their positions. For example, the distance between the first blocking portion BK1 and the second blocking portion BK2 in the first direction DR1 can be different from the distance between the first blocking portion BK1 and the third blocking portion BK3 in the second direction DR2.

[0104] First inorganic layer IO1 (reference) Figure 4A The recess GM can be disposed on the pixel-defining layer PDL and can include an uneven upper surface corresponding to the space defined by the blocking portion. Therefore, the recess GM can be defined by the upper surface of the first inorganic layer IO1 to overlap with the space. When viewed in a plane, the recess GM can have a shape corresponding to the shape of the space defined by the blocking portion.

[0105] Multiple blocking sections arranged adjacent to each other can be defined as a blocking group (BKG). For example, Figure 3 The embodiments include a blocking group BKG defined by a first blocking portion BK1, a second blocking portion BK2, a third blocking portion BK3, and a fourth blocking portion BK4 arranged adjacent to each other. However, embodiments of the inventive concept are not limited thereto, and the blocking group BKG can be (such as...) Figures 8A to 8C (as shown in the embodiments) variations.

[0106] The shape obtained by connecting the outer sides of the adjacent blocking portions with the space defined by the blocking portions in a plane can vary. For example, in an embodiment, the shape can be a polygonal shape (such as a triangle, quadrilateral, rhombus, etc.) or a circular shape. Figure 3 The shape obtained by connecting the outer side of the blocking portion and the space defined by the blocking portion is shown by dashed lines, and this shape can be defined as the shape of the blocking group BKG. Figure 3 The embodiment shown illustrates the shape of a blocking assembly BKG with a quadrilateral shape. However, the embodiments of the present invention are not limited to this, and the shape can be varied, as long as it is obtained by connecting the outer sides of the blocking portions defining the space.

[0107] In an embodiment, multiple blocking groups BKGs can be configured, and these multiple blocking groups BKGs can be disposed within a portion of the peripheral region NPXA to overlap with the peripheral region NPXA. The blocking groups BKGs can be configured not to overlap with the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3 (e.g., configured not to overlap with the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3 on the third-direction DR3). This is achieved with the light-emitting element layer DP-LE (refer to...). Figure 2 Increasing the number of blocking groups (BKG) on the display panel (DP) can enhance its resistance to external tension. Furthermore, it can more effectively reduce or prevent delamination defects between the common layer (EL) and the pixel-defining layer (PDL), and between the common layer (EL) and the first inorganic layer (IO1), caused by folding operations.

[0108] Figure 4A It is along Figure 3 The line I-I' is cut off to show a cross-sectional view of the pixel-defining layer (PDL) and the encapsulation layer (TFE). Figure 4B This is a cross-sectional view showing the pixel-defining layer (PDL) and the encapsulation layer (TFE). Except for the shape of the first inorganic layer (IO1) in the side view, the pixel-defining layer (PDL) and the encapsulation layer (TFE) have the same shape as... Figure 4A The pixel-defining layer (PDL) and the encapsulation layer (TFE) are constructed in essentially the same way.

[0109] Reference Figure 4A In an embodiment, a first blocking portion BK1 and a second blocking portion BK2 in a pixel-defining layer PDL can be formed having a first distance D1 in a first direction DR1 (refer to...). Figure 6 A first space SP1 (or having a first length D1 in the first direction DR1). A first groove GM1 may be defined by the upper surface of a first inorganic layer IO1 superimposed on the first space SP1. The first inorganic layer IO1 superimposed on the first space SP1 may have a thickness that varies depending on its position.

[0110] In this embodiment, the first inorganic layer IO1 can be formed on the light-emitting element layer DP-LE by a chemical vapor deposition (CVD) process. The thickness of the first inorganic layer IO1 can vary due to the material of the composition forming the first inorganic layer IO1, the deposition angle, and the shape of the upper surface on which the first inorganic layer IO1 is deposited. The deposition shape of the first inorganic layer IO1 can be controlled by adjusting the thickness of the first inorganic layer IO1 during the deposition process.

[0111] like Figure 4AAs shown in the embodiment, the first inorganic layer IO1 superimposed on the first space SP1 may include a first portion IO1-1, a second portion IO1-2, and a third portion IO1-3. The first portion IO1-1, the second portion IO1-2, and the third portion IO1-3 may be formed in a shape corresponding to the first space SP1.

[0112] like Figure 4A As shown in the embodiment, the first portion IO1-1 of the first inorganic layer IO1 can be configured to be substantially parallel to the light-emitting element layer DP-LE. The normal direction of the upper surface of the first portion IO1-1 can be substantially parallel to the third direction DR3. Each of the second portion IO1-2 and the third portion IO1-3 of the first inorganic layer IO1 can be bent from the first portion IO1-1. The second portion IO1-2 and the third portion IO1-3 can be spaced apart from each other in the first direction DR1 and can face each other.

[0113] like Figure 4A As shown in the embodiment, the first groove GM1 may be defined by the upper surfaces of the first portion IO1-1, the second portion IO1-2, and the third portion IO1-3. The first groove GM1 may be defined by being recessed from a plane. The organic layer MN may be filled in the recessed first groove GM1. When the organic layer MN is filled in the first groove GM1, delamination defects between the organic layer MN and the first inorganic layer IO1 caused by folding operations can be reduced or prevented.

[0114] The thickness of the second part IO1-2 (e.g., its length in the first direction DR1) and the thickness of the third part IO1-3 (e.g., its length in the first direction DR1) can vary depending on their positions. For example, as Figure 4A As shown in the embodiment, the upper portions of the second portion IO1-2 and the third portion IO1-3 may be relatively farther away from the first portion IO1-1 on the third-direction DR3, and the lower portions of the second portion IO1-2 and the third portion IO1-3 may be relatively closer to the first portion IO1-1 on the third-direction DR3. The thickness of the upper portion of each of the second portion IO1-2 and the third portion IO1-3 may be greater than the thickness of the lower portion of each of the second portion IO1-2 and the third portion IO1-3.

[0115] like Figure 4AAs shown in the embodiment, the thickness t1 of the upper part of the second portion IO1-2 can be greater than the thickness t2 of the lower part of the second portion IO1-2. The shape of the first inorganic layer IO1 deposited on the pixel-defining layer PDL and the common layer EL can be changed due to the different thicknesses of the upper and lower parts. For example, the upper part of the second portion IO1-2 can protrude in the first direction DR1 and can have an outward shape due to the larger thickness of the upper part of the second portion IO1-2 compared to the lower part of the second portion IO1-2.

[0116] like Figure 4A As shown in the embodiments, the thickness of the second portion IO1-2 can gradually increase, and the inner wall defining a portion of the first groove GM1 can be inclined relative to the base portion BS in the direction toward the third portion IO1-3. The upper portion of the second portion IO1-2 can protrude from the adjacent portion of the second portion IO1-2 in a non-gradual manner and can form an overhanging shape portion. The thickness of the third portion IO1-3 can have a similar arrangement, and the inner wall of the third portion IO1-3 can be inclined relative to the base portion BS in the direction toward the second portion IO1-2.

[0117] The first groove GM1 may have a width that varies depending on its position (e.g., its length in the first direction DR1). The shape of the first groove GM1, defined by the upper surfaces of the first portion IO1-1, the second portion IO1-2, and the third portion IO1-3, may vary due to the thickness of the first portion IO1-1, the second portion IO1-2, and the third portion IO1-3. For example, the upper portion of the first groove GM1 may have a width t3 that is smaller than the width t4 of the lower portion of the first groove GM1.

[0118] Since the first inorganic layer IO1 has an outward shape in some areas, the width t3 of the upper part of the first groove GM1 can be relatively narrower than the width t4 of the lower part of the first groove GM1.

[0119] The organic layer MN can be in direct contact with the upper surface of the first inorganic layer IO1. In an embodiment, the organic layer MN can be formed by coating the upper surface of the first inorganic layer IO1 with a composition for forming the organic layer MN and curing the composition. During the formation of the organic layer MN, the composition for the organic layer MN can be filled into the first groove GM1 and can be cured. The adhesion between the organic layer MN and the first inorganic layer IO1 can be strengthened by the force at the interface between the organic layer MN filled in the first groove GM1 and the first inorganic layer IO1, and by the shape of the upper width of the first groove GM1 being relatively narrow compared to the lower width of the first groove GM1. Therefore, delamination defects between the organic layer MN and the first inorganic layer IO1 caused by folding operations can be reduced or prevented.

[0120] like Figure 4A As shown in the embodiment, the first inorganic layer IO1 can be configured to directly contact the upper surface of the common layer EL. The first inorganic layer IO1 and the common layer EL, configured to be stacked with the first space SP1, can directly contact each other along a first direction DR1, which is the lateral direction. Therefore, the first inorganic layer IO1 can be subjected to pressure (e.g., pressure applied towards the substrate portion BS on a third direction DR3) to allow the common layer EL to fully adhere to the pixel-defining layer PDL. Thus, delamination defects between the first inorganic layer IO1 and the common layer EL, and between the common layer EL and the pixel-defining layer PDL, caused by folding operations can be reduced or prevented.

[0121] In addition to the shapes of the first inorganic layer IO1 and the first groove GM1, which are set to be superimposed on the first space SP1, Figure 4B The first inorganic layer IO1 shown in the embodiment has the same as Figure 4A The first inorganic layer IO1 shown in the embodiment has a substantially the same structure.

[0122] The thickness t1 of the upper part of the second portion IO1-2 of the first inorganic layer IO1 (e.g., the length in the first direction DR1) can be greater than the thickness t2 of the lower part of the second portion IO1-2. However, with Figure 4A The shapes differ; the second part IO1-2 and the third part IO1-3 can have a shape in which the thickness of each of the second part IO1-2 and the third part IO1-3 gradually increases with the distance from the first part IO1-1 along the third direction DR3, and the upper parts of the second part IO1-2 and the third part IO1-3 can be non-protruding and not form an outward shape. Therefore, Figure 4B The width t3 of the upper part of the first groove GM1 shown (e.g., the length in the first direction DR1) can be greater than Figure 4A The width t3 of the upper part of the first groove GM1 shown.

[0123] When the width t3 of the upper part of the first groove GM1 decreases, the organic layer MN filled in the first groove GM1 may not easily come out of the first groove GM1. Therefore, in terms of delamination defects, the organic layer MN and the first inorganic layer IO1 may not easily separate from each other. The width and shape of the first groove GM1 can be controlled by adjusting the arrangement distance between the first blocking portion BK1 and the second blocking portion BK2 and the deposition process of the first inorganic layer IO1. Therefore, the organic layer MN can be fully filled in the first groove GM1, and delamination defects of the organic layer MN can be effectively reduced or prevented by controlling the width and shape of the first groove GM1.

[0124] Figure 5A and Figure 5BThis is a cross-sectional view illustrating a pixel-defining layer PDL, a common layer EL, and a first inorganic layer IO1 according to an embodiment of the present invention. The pixel-defining layer PDL, the common layer EL, and the first inorganic layer IO1 include... Figures 2 to 4B The construction shown in the embodiments is substantially the same as that in the embodiments, therefore, referring to Figures 2 to 4B The descriptions of essentially similar components can be applied to Figure 5A and Figure 5B The pixel-defining layer PDL, the common layer EL, and the first inorganic layer IO1 in the embodiment are described herein, and for ease of explanation, they will not be repeated. See also... Figure 5A and Figure 5B The embodiments will primarily describe the shape of the first blocking portion BK1 and the shape of the second blocking portion BK2 included in the pixel-defining layer PDL.

[0125] Reference Figure 5A and Figure 5B In one embodiment, the first blocking portion BK1 may include a lower surface B1-B and a first side surface B1-S. The second blocking portion BK2 may include a lower surface B2-B and a second side surface B2-S. Each of the lower surfaces B1-B of the first blocking portion BK1 and B2-B of the second blocking portion BK2 may be substantially parallel to the plane defined by the first direction DR1 and the second direction DR2. The lower surfaces B1-B of the first blocking portion BK1 and B2-B of the second blocking portion BK2 may be substantially parallel to the upper surface of the base portion BS. The first side surface B1-S and the second side surface B2-S may be spaced apart from each other in the first direction DR1 and may face each other.

[0126] like Figure 5A As shown in the embodiment, the angle between the lower surface B1-B of the first blocking portion BK1 and the first side surface B1-S can be defined as a first angle θ1, and the angle between the lower surface B2-B of the second blocking portion BK2 and the second side surface B2-S can be defined as a second angle θ2. In the embodiment, each of the first angle θ1 and the second angle θ2 can be in the range of about 45 degrees to about 180 degrees.

[0127] exist Figure 5A In one embodiment, the first blocking portion BK1 and the second blocking portion BK2 each have a first angle θ1 and a second angle θ2, both greater than approximately 90 degrees. Figure 5B In one embodiment, the first blocking portion BK1 and the second blocking portion BK2 each have a first angle θ1 and a second angle θ2, both less than approximately 90 degrees. For example... Figure 4A As shown in the embodiments, the first angle θ1 and the second angle θ2 can be approximately 90 degrees, and the first side surface B1-S and the second side surface B2-S can be substantially parallel to each other.

[0128] The first angle θ1 and the second angle θ2 can influence the frictional force between the common layer EL and the first inorganic layer IO1 disposed on the first side surface B1-S and the second side surface B2-S, or the frictional force between the pixel defining layer PDL and the first inorganic layer IO1. As the first angle θ1 and the second angle θ2 increase, the frictional force at the interface between the components increases, and as the frictional force increases, the components may become more difficult to separate from each other. Therefore, delamination defects between the common layer EL and the first inorganic layer IO1 disposed on the first blocking portion BK1 and the second blocking portion BK2 can be reduced or prevented by adjusting the first angle θ1 and the second angle θ2.

[0129] Figure 6 It is along Figure 3 Line II-II' is cut to show a cross-sectional view of the pixel defining layer (PDL) and the encapsulation layer (TFE). The pixel defining layer (PDL) may include a first blocking portion BK1, a second blocking portion BK2, and a third blocking portion BK3. The first blocking portion BK1 may be spaced apart from the second blocking portion BK2 (e.g., spaced apart from the second blocking portion BK2 in a first direction DR1) and may define a first space SP1 having a first distance D1 (or a first length D1) in the first direction DR1. The third blocking portion BK3 may be spaced apart from the first blocking portion BK1 (e.g., spaced apart from the first blocking portion BK1 in a second direction DR2) and may define a second space SP2 having a second distance D2 (or a second length D2) in the second direction DR2.

[0130] Multiple blocking portions (such as first blocking portion BK1, second blocking portion BK2, and third blocking portion BK3) included in the pixel-defined layer (PDL) and adjacent to each other can be spaced apart from each other at different distances. For example, as Figure 6 As shown in the embodiments, the first distance D1 can be smaller than the second distance D2. The deposition of the first inorganic layer IO1, which is spatially superimposed with a relatively large distance, can be easily deposited with a relatively uniform thickness.

[0131] The adhesion between the pixel-defining layer PDL, the common layer EL, and the first inorganic layer IO1 can be increased by configuring the first inorganic layer IO1 to be superimposed on the space defined by the blocking portion. Therefore, delamination defects between the pixel-defining layer PDL, the common layer EL, and the first inorganic layer IO1 can be reduced or prevented.

[0132] The deposition shapes of the first inorganic layer IO1, which is spatially superimposed with the first inorganic layer IO1 formed at different distances, can differ from each other to correspond to the space. Therefore, the grooves defined by the upper surface of the first inorganic layer IO1, which is spatially superimposed with the first inorganic layer IO1 formed at different distances, can have different widths and different shapes.

[0133] The first groove GM1 may be defined by the upper surface of the first inorganic layer IO1 superimposed with the first space SP1, and the second groove GM2 may be defined by the upper surface of the first inorganic layer IO1 superimposed with the second space SP2. The first groove GM1 and the second groove GM2 may have different shapes from each other.

[0134] The first groove GM1 may have a shape in which the width t3 of the upper part of the first groove GM1 (e.g., the length in the first direction DR1) is less than the width t4 of the lower part of the first groove GM1 (e.g., the length in the first direction DR1). The second groove GM2 may have a shape in which the width t5 of the upper part of the second groove GM2 (e.g., the length in the second direction DR2) is equal to or similar to the width of the lower part of the second groove GM2 (e.g., the length in the second direction DR2), or the width t5 of the upper part of the second groove GM2 may be greater than the width of the lower part of the second groove GM2.

[0135] The organic layer MN, which fills the first groove GM1 with a relatively small upper width t3, does not easily come out of the first groove GM1. Therefore, the first inorganic layer IO1 and the organic layer MN can not easily separate from each other. The organic layer MN, which fills the second groove GM2 with a width t5 at its upper part that is relatively larger than the upper width t3 of the first groove GM1, can fully fill the space defined by the second groove GM2 without leaving any empty space.

[0136] In this embodiment, the first space SP1 and the second space SP2 may be integrally formed spaces, and may not be discrete or separate from each other. Therefore, the first groove GM1 and the second groove GM2 defined by the upper surface of the first inorganic layer IO1 may be integrally defined.

[0137] Figure 7A and Figure 7B The illustration shows a pixel-defining layer (PDL) and an encapsulation layer (TFE) according to an embodiment of the present invention. The components include... Figures 2 to 4B The construction of the embodiments is substantially the same as that of the embodiments, therefore, referring to Figures 2 to 4B The description of the embodiments can be applied to Figure 7A and Figure 7B The components, and for ease of explanation, may not be described repeatedly. Figure 7A and Figure 7B In the embodiments, the pixel definition layer (PDL) and Figure 4A The pixel-defining layer (PDL) shown in the embodiments differs from that described in the present invention, and will be primarily described in the same manner. Figure 4A The pixel-defined layer (PDL) of the embodiments has different features.

[0138] exist Figure 7AIn the pixel defining layer PDL shown in the embodiment, the substrate portion BS may be omitted. Multiple blocking portions (such as the first blocking portion BK1 and the second blocking portion BK2) included in the pixel defining layer PDL may be configured to directly contact the upper surface of the third insulating layer 30.

[0139] The first blocking portion BK1 and the second blocking portion BK2, which are spaced apart from each other to define a predetermined first space SP1, can directly contact the circuit layer DP-CL (see reference). Figure 2 The upper surface of the third insulating layer 30 in the first space SP1 is configured such that the lower surface of the common layer EL, which is superimposed on the first space SP1, can directly contact the upper surface of the third insulating layer 30. The outer edges of the first blocking portion BK1 and the second blocking portion BK2 can extend at an inclined angle relative to the upper surface of the third insulating layer 30.

[0140] Figure 7B The pixel defining layer (PDL) shown in the embodiments may include a substrate portion BS and a plurality of blocking portions (such as a first blocking portion BK1 and a second blocking portion BK2) integrally formed with the substrate portion BS. For example, in an embodiment, the first blocking portion BK1 and the second blocking portion BK2 of the pixel defining layer PDL may be formed by etching a portion of a layer having a flat upper surface. The substrate portion BS and the first blocking portion BK1 and the second blocking portion BK2 may include the same material. However, embodiments of the inventive concept are not limited thereto, and the pixel defining layer PDL may vary. For example, the pixel defining layer PDL may be formed by disposing the first blocking portion BK1 and the second blocking portion BK2 on the substrate portion BS having a flat upper surface, and the substrate portion BS may include a material different from the material of the first blocking portion BK1 and the second blocking portion BK2.

[0141] Figures 8A to 8C This is a plan view illustrating an embodiment of the pixel-defined layer (PDL) according to the concept of the present invention. Figures 8A to 8C Various shapes of multiple blocking portions in a plane are shown, representing various embodiments of the invention. For ease of explanation, the blocking portions are shaded in the illustrations.

[0142] Each of the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 can be configured as multiple, and can have a patterned shape in a plane. Figures 8A to 8CThe embodiments shown illustrate various examples of a first blocking portion BK1, a second blocking portion BK2, a third blocking portion BK3, and a fourth blocking portion BK4 having patterned shapes. However, embodiments of the inventive concept are not limited thereto, and the pattern shapes can vary, as long as the pattern is formed by the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 arranged according to a specific rule.

[0143] like Figure 8A As shown in the embodiments, when viewed in a plane, the predetermined first space SP1 and the predetermined second space SP2, defined by the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4, can be arranged in a radial shape relative to the imaginary center CP. In this specification, the term "radial shape" means the shape in which the space extends in several directions relative to the imaginary center CP.

[0144] Reference Figure 8A and Figure 8B In one embodiment, when viewed in a plane, the width D3 of the first space SP1 may be different from the width D4 of the second space SP2. The first space SP1 and the second space SP2, which have different widths, can be integrally formed together.

[0145] like Figure 8B As shown in the embodiments, the second space SP2 can extend longitudinally substantially along the first direction DR1 and the second direction DR2, which intersects the first direction DR1 at the imaginary center CP. The first space SP1 can extend diagonally relative to the imaginary center CP between the first direction DR1 and the second direction DR2. However, the shape in the plane of the predetermined space defined by the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 should not be specifically limited, as long as the shape is defined by the blocking portions spaced apart from each other.

[0146] The first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 can have various shapes in a plane and should not be specifically limited. For example, in an embodiment, each of the first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 can have a triangular shape, a quadrilateral shape, or a sector shape when viewed in a plan view.

[0147] The first blocking portion BK1, the second blocking portion BK2, the third blocking portion BK3, and the fourth blocking portion BK4 may have the same area or different areas in the plane. Figure 8CThe embodiments illustrate a pixel-defined layer (PDL) where some portions of the blocking portion have the same area in the plane, and some portions of the blocking portion have different areas in the plane. (Refer to...) Figure 8C In one embodiment, the first blocking portion BK1 may have an area substantially the same as the area of ​​the fourth blocking portion BK4, and may have an area different from the areas of each of the second blocking portion BK2 and the third blocking portion BK3. The second blocking portion BK2 and the third blocking portion BK3 may have the same area as each other, which is smaller than the area of ​​each of the first blocking portion BK1 and the fourth blocking portion BK4.

[0148] For reference Figure 3 As described in the embodiments, in Figures 8A to 8C In this design, the adjacent blocking portions can be defined as a blocking group BKG-a, BKG-b, or BKG-c. In the plane, each of the blocking groups BKG-a, BKG-b, and BKG-c, obtained by connecting the outer sides of the adjacent blocking portions to the space defined by the blocking portions, can have various shapes. For example, Figure 8A The blocking assembly BKG-a shown in the embodiments may have a rhomboid shape. Figure 8B The blocking assembly BKG-b shown in the embodiments can have an elliptical shape, and Figure 8C The blocking assembly BKG-c shown in the embodiments may have a quadrilateral shape. However, the embodiments of the present invention are not limited to those described herein. Figures 8A to 8C The shape of the blocking group shown in the embodiment can be varied.

[0149] A display panel according to an embodiment of the present invention may include: a pixel defining layer including blocking portions spaced apart from each other to define a predetermined space; an inorganic layer disposed on the pixel defining layer to correspond to the shape of the pixel defining layer and having a groove defined by the upper surface of the inorganic layer, the inorganic layer having various shapes by varying the thickness of the inorganic layer configured to overlap with the predetermined space according to its position; and an organic layer disposed on the inorganic layer. Delamination defects between the inorganic layer and components of the light-emitting element layer that are in direct contact with the lower surface of the same inorganic layer can be reduced or prevented by the inorganic layer configured to overlap with the predetermined space, and delamination defects between inorganic layers can be reduced or prevented by the organic layer filling the groove defined by the upper surface of the inorganic layer. Therefore, even with repeated folding or unfolding of the display panel, delamination defects between components in the display panel of the present invention can be reduced or prevented, and the reliability of the display panel can be improved.

[0150] Although embodiments of the inventive concept have been described, it is understood that the inventive concept should not be limited to these embodiments, but rather that various changes and modifications can be made by those skilled in the art within the spirit and scope of the inventive concept.

[0151] Therefore, the inventive concept should not be limited to any single embodiment described herein.

Claims

1. A display panel comprising: a light emitting element layer including a pixel defining layer and a light emitting element, the pixel defining layer including a base portion and first and second barrier portions disposed on and in contact with the base portion, the base portion having an opening defined through the base portion, the light emitting element disposed in the opening, the first and second barrier portions spaced apart from each other in a first direction to define a first space over the base portion having a first length in the first direction; a first inorganic layer covering the light emitting element layer, the first inorganic layer including an uneven upper surface corresponding to the first space; and an organic layer in contact with the upper surface of the first inorganic layer, wherein a first recess is defined by the upper surface of the first inorganic layer superimposed with the first space, a thickness of the first inorganic layer superimposed with the first space varies, and the organic layer fills in the first recess.

2. The display panel according to claim 1, wherein: the first inorganic layer superimposed with the first space includes a first portion disposed parallel to the light emitting element layer, a second portion bent from the first portion, and a third portion bent from the first portion, the third portion spaced apart from and facing the second portion, wherein an upper portion of each of the second and third portions has a thickness greater than a thickness of a lower portion of each of the second and third portions. a width of an upper portion of the first recess is less than a width of a lower portion of the first recess.

3. The display panel of claim 1, wherein, the second length is greater than the first length. 4.The display panel of claim 1, further comprising a third blocking portion spaced apart from the first blocking portion to define a second space, the second space having a second length in a second direction crossing the first direction, wherein, 5. The display panel according to claim 4, wherein: a second recess is defined by an upper surface of the first inorganic layer superimposed with the second space; and a width of an upper portion of the second recess is greater than a width of an upper portion of the first recess. the width of the upper portion of the second recess is greater than or equal to a width of a lower portion of the second recess.

6. The display panel of claim 5, wherein, each of the first and second barrier portions has a triangular shape, a quadrilateral shape, or a sector shape in a plane.

7. The display panel of claim 1, wherein, 8. The display panel according to claim 1, wherein: the first barrier portion includes a lower surface and a first side surface; the second barrier portion includes a lower surface and a second side surface facing the first side surface, and wherein each of a first angle between the lower surface of the first barrier portion and the first side surface of the first barrier portion and a second angle between the lower surface of the second barrier portion and the second side surface of the second barrier portion is in a range of 45 degrees to 180 degrees. the base portion is in contact with a lower surface of each of the first and second barrier portions.

9. The display panel of claim 1, wherein, each of the first and second barrier portions is disposed as a plurality, and the plurality of the first barrier portions and the plurality of the second barrier portions form a pattern shape in a plane.

10. The display panel of claim 1, wherein, ​

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