Display device

Abstract

According to an embodiment of the present disclosure, there is provided a display device including: a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including an emission area and a non-emission area; a coating layer disposed over the substrate and having a recess between the emission regions; a first electrode layer disposed on a periphery of the recess; a metal pattern layer provided to cover the slope portion of the recess; and a bank layer covering the recess and disposed on the metal pattern layer. The light extraction efficiency can be improved.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2023-0152306, filed on November 7, 2023, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0003] Embodiments of the present disclosure relate to a display device. Background Art

[0004] The display device is being widely used as a display screen of a notebook computer, a tablet computer, a smart phone, a portable display device, and a portable information device, in addition to a display device of a television or a monitor.

[0005] Display devices can be classified into reflective display devices and luminescent display devices. A reflective display device is a display device in which natural light or light emitted from external lighting of the display device is reflected on the display device to display information, and a luminescent display device is a display device in which a light-emitting element or light source is built into the display device and information is displayed using light generated from the built-in light-emitting element or light source. Summary of the invention

[0006] In the case of a conventional display device, since the second electrode layer serving as a reflective electrode is flat, light emitted from the light-emitting layer and propagating laterally may not be extracted to the outside but may disappear in the embankment layer, thereby reducing light efficiency and causing problems of visibility and contrast degradation due to reflection of external light.

[0007] Embodiments of the present disclosure may provide a display device capable of improving light extraction efficiency.

[0008] Embodiments of the present disclosure may provide a display device capable of low-power driving by improving light extraction efficiency.

[0009] According to an embodiment of the present disclosure, a display device may include: a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including an emission region and a non-emission region; an overcoat layer disposed above the substrate and having a recess between the emission regions; a first electrode layer disposed on the periphery of the recess; a metal pattern layer disposed to cover a slope portion of the recess; and a dam layer covering the recess and disposed on the metal pattern layer.

[0010] According to an embodiment of the present disclosure, a display device may include: a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including an emission region and a non-emission region; a coating layer disposed above the substrate and having a recess between the emission regions; a first electrode layer disposed on the periphery of the recess; and a dam layer covering a slope portion of the recess, wherein the coating layer includes a first coating layer and a second coating layer, the first coating layer being disposed above the substrate, the second coating layer being disposed on the first coating layer and including the slope portion of the recess, and wherein a refractive index of the second coating layer is greater than a refractive index of the first coating layer.

[0011] According to an embodiment of the present disclosure, a display device may include: a substrate; a plurality of sub-pixels, each of the plurality of sub-pixels including an emission region and a non-emission region; a coating layer, which is disposed above the substrate and has a recessed portion between the emission regions; a first electrode layer, which is disposed on the coating layer; a dam layer, which covers at least a portion of the first electrode layer and at least a portion of the recessed portion; and a light-emitting layer, which covers at least a portion of the first electrode layer and at least a portion of the dam layer, wherein at least a portion of the light-emitting layer overlaps with the recessed portion.

[0012] According to an embodiment of the present disclosure, a display device capable of improving light extraction efficiency can be provided.

[0013] According to an embodiment of the present disclosure, a display device capable of low-power driving may be provided by improving light extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a diagram showing a schematic system configuration of a display device according to an embodiment of the present disclosure.

[0015] Figure 2 is a view showing a schematic planar structure of a pixel structure provided in a display panel of a display device according to an embodiment of the present disclosure.

[0016] Figure 3 It is along Figure 2 A cross-sectional view taken along line AA'.

[0017] Figure 4 is a view showing a schematic planar structure of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0018] Figure 5 It is along Figure 4 A cross-sectional view taken along line BB'.

[0019] Figure 6is a view showing a schematic planar structure of a pixel structure provided in a display panel of a display device according to still another embodiment of the present disclosure.

[0020] Figure 7 It is along Figure 6 A cross-sectional view taken along line CC'. DETAILED DESCRIPTION

[0021] In the following description of examples or embodiments of the present disclosure, reference will be made to the accompanying drawings, in which specific examples or embodiments that can be implemented are shown by way of illustration, and the same reference numerals and symbols in the accompanying drawings may be used to represent the same or similar parts, even when these parts are shown in different drawings from each other. In addition, in the following description of examples or embodiments of the present disclosure, when it is determined that a detailed description of the well-known functions and components incorporated herein may make the subject matter in some embodiments of the present disclosure quite unclear, the description will be omitted. Terms such as "including", "having", "comprising", "consisting of", "consisting of", and "formed of" used in this article are generally intended to allow the addition of other components, unless these terms are used together with the term "only". As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise.

[0022] Terms such as "first", "second", "A", "B", "(A)" or "(B)" may be used herein to describe elements of the present disclosure. Each of these terms is not used to define the nature, order, sequence, number, etc. of the elements, but is only used to distinguish the corresponding elements from other elements.

[0023] When it is mentioned that a first element is “connected or coupled to” a second element, “contacts or overlaps” the second element, etc., it should be interpreted that not only the first element can be “directly connected or coupled to” the second element or “directly contact or overlaps” the second element, but also a third element can be “inserted” between the first and second elements, or the first and second elements can be “connected or coupled to”, “contacts or overlaps”, etc., each other via a fourth element. Here, the second element can be included in at least one of the two or more elements that are “connected or coupled to”, “contacts or overlaps”, etc., each other.

[0024] When time-related terms such as "after", "subsequently", "next", "before", etc. are used to describe a process or operation of an element or configuration, or a flow or step in an operation, process, or manufacturing method, these terms may be used to describe non-sequential or non-sequential processes or operations unless the terms "directly" or "immediately" are used together.

[0025] In addition, when referring to any dimension, relative size, etc., it should be considered that the numerical value of the element or feature, or the corresponding information (e.g., level, range, etc.) includes the tolerance or error range that may be caused by various factors (e.g., process factors, internal or external influences, noise, etc.), even when no relevant description is specified. In addition, the term "may" fully encompasses all meanings of the term "can".

[0026] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0027] Figure 1 is a diagram showing a schematic system configuration of a display device according to an embodiment of the present disclosure.

[0028] Reference Figure 1 , a driving system of the display device 100 according to an embodiment of the present disclosure may include a display panel 110 and a display driving circuit for driving the display panel 110 .

[0029] The display panel 110 may include a display area DA where an image is displayed and a non-display area NDA where an image is not displayed.

[0030] The display panel 110 may include a plurality of sub-pixels SP disposed on the substrate 200 to display an image.

[0031] The display panel 110 may include a plurality of signal wirings disposed on the substrate 200 .

[0032] For example, the plurality of signal wirings may include a data line DL, a gate line GL, a driving voltage line DVL, and the like.

[0033] Each of the multiple data lines DL can be configured to extend in a first direction (a column direction in the example or a row direction in another example), and each of the multiple gate lines GL can be configured to extend in a second direction (a row direction in the example or a column direction in another example) orthogonal to the first direction.

[0034] The display driving circuit may include a data driving circuit 120 , a gate driving circuit 130 , and a controller 140 .

[0035] The controller 140 may control the data driving circuit 120 and the gate driving circuit 130 .

[0036] The data driving circuit 120 may output data signals corresponding to image signals to the plurality of data lines DL.

[0037] The gate driving circuit 130 may generate a gate signal and output the gate signal to the plurality of gate lines GL.

[0038] The controller 140 may convert input image data input from the external host 150 to adapt to a data signal format adopted in the data driving circuit 120 , and may supply the converted image data to the data driving circuit 120 .

[0039] The data driving circuit 120 may include at least one source driver integrated circuit.

[0040] For example, each source driver integrated circuit can be connected to the display panel 110 in a tape automated bonding (TAB) method, can be connected to a bonding pad of the display panel 110 in a chip on glass (COG) or chip on panel (COP) method, or can be connected to the display panel 110 by being implemented in a chip on film (COF) method.

[0041] The gate driving circuit 130 may be connected to the display panel 110 in a tape automated bonding (TAB) method, may be connected to a bonding pad of the display panel 110 in a COG or COP method, may be connected to the display panel 110 according to a COF method, or may be formed in a non-display area NDA of the display panel 110 in a gate-in-panel (GIP) type.

[0042] Reference Figure 1 , in the display device 100 according to the embodiment of the present disclosure, each sub-pixel SP may include a light emitting element ED and a pixel driving circuit SPC for driving the light emitting element ED.

[0043] The pixel driving circuit SPC may include a driving transistor DRT, a scanning transistor SCT, and a storage capacitor Cst.

[0044] The driving transistor DRT may drive the light emitting element ED by controlling a current flowing to the light emitting element ED.

[0045] The scan transistor SCT may transfer the data voltage Vdata to the second node N2 which is the gate node of the driving transistor DRT.

[0046] The storage capacitor Cst may be configured to maintain a voltage for a predetermined period of time.

[0047] The light emitting element ED may include a first electrode layer 250 , a second electrode layer 270 , and a light emitting layer 260 .

[0048] The light emitting layer 260 is located between the first electrode layer 250 and the second electrode layer 270 .

[0049] The first electrode layer 250 may be a pixel electrode participating in the formation of the light emitting element ED of each sub-pixel SP, and may be electrically connected to the first node N1 of the driving transistor DRT.

[0050] The second electrode layer 270 may be a common electrode participating in the formation of the light emitting elements ED of all sub-pixels SP, and may be applied with a reference voltage EVSS.

[0051] For example, the light emitting element ED may be an organic light emitting diode (OLED), an inorganic-based light emitting diode (LED), or a quantum dot (QD) light emitting element.

[0052] When the display device 100 according to an embodiment of the present disclosure is an OLED display, each sub-pixel SP may include an organic light emitting diode (OLED) as a light emitting element.

[0053] When the display device 100 according to an embodiment of the present disclosure is a quantum dot (QD) light emitting element, each sub-pixel SP may include a light emitting element made of a quantum dot (QD).

[0054] When the display device 100 according to an embodiment of the present disclosure is a micro LED display, each sub-pixel SP may include a micro light emitting diode (micro LED) that emits light by itself and is made based on an inorganic material as a light emitting element.

[0055] The driving transistor DRT, which is a transistor for driving the light emitting element ED, may include a first node N1, a second node N2, and a third node N3.

[0056] The first node N1 may be a source node or a drain node and may be electrically connected to the first electrode layer 250 of the light emitting element ED.

[0057] The second node N2 may be a gate node and may be electrically connected to a source node or a drain node of the scan transistor SCT.

[0058] The third node N3 may be a drain node or a source node, and may be electrically connected to a driving voltage line DVL supplying a driving voltage EVDD.

[0059] In this specification, it will be described as an example that the first node N1 is a source node, and the third node N3 is a drain node.

[0060] The scan transistor SCT may switch the connection between the data line DL and the second node N2 of the driving transistor DRT.

[0061] The scan transistor SCT may control connection between the second node N2 of the drive transistor DRT and a corresponding data line DL of the plurality of data lines DL in response to a scan signal SCAN supplied from a scan line SCL as a type of gate line GL.

[0062] The storage capacitor Cst may be configured between the first node N1 and the second node N2 of the driving transistor DRT.

[0063] Figure 1 The structure of the sub-pixel SP shown is merely an example for illustration, and may further include at least one transistor or at least one capacitor.

[0064] Each of the plurality of sub-pixels SP may have the same structure, and some of the plurality of sub-pixels SP may have different structures.

[0065] Each of the driving transistor DRT and the scanning transistor SCT may be an n-type transistor or a p-type transistor.

[0066] The display device 100 according to an embodiment of the present disclosure may have a top emission structure or a bottom emission structure.

[0067] Hereinafter, in this specification, a bottom emission structure is described as an example.

[0068] For example, in the case of a bottom emission structure, the first electrode layer 250 may be a conductive material that transmits light or semi-transmits light, and the second electrode layer 270 may be a reflective metal.

[0069] Figure 2 is a view showing a schematic planar structure of a pixel structure provided in a display panel of a display device according to an embodiment of the present disclosure.

[0070] Reference Figure 2 The display device 100 according to the embodiment of the present disclosure includes a plurality of sub-pixels. Each sub-pixel includes a light emitting layer 260 (see, for example, Figure 3 ) The luminous emission area EA and the non-emission area NEA except the emission area EA.

[0071] The display device 100 according to an embodiment of the present disclosure may include a bank layer 240 for partitioning each sub-pixel.

[0072] The emission area EA may be defined by the opening area of ​​the bank layer 240 (see, for example, Figure 2 The emission area EA is in the middle area of ​​the device.

[0073] In other words, the emission area EA of the sub-pixel may be substantially the same as the opening area of ​​the bank layer 240 .

[0074] In this disclosure, substantially the same may mean the same degree taking into account minor differences due to errors in processing.

[0075] The sub-pixel structure of the display device 100 according to an embodiment of the present disclosure may also include a "signal line connection structure", which is related to each sub-pixel being connected to various signal lines such as a data line DL, a gate line (not shown), a driving voltage line (not shown) and a reference voltage line (not shown).

[0076] The signal lines may include not only a data line DL for supplying a data voltage (Vdata) to each sub-pixel and a gate line (not shown) for supplying a scanning signal, but may also include a reference voltage line (not shown) for supplying a reference voltage (Vref) to each sub-pixel and a driving voltage line (not shown) for supplying a driving voltage (EVDD).

[0077] In the display device 100 according to an embodiment of the present disclosure, pixels disposed in the emission area EA of the display device 100 may include sub-pixels of different colors to implement colors of an image.

[0078] The sub-pixels may include a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B).

[0079] Each of the sub-pixels may include a white sub-pixel.

[0080] Reference Figure 2 , a first electrode layer 250 may be provided in each sub-pixel provided in the display panel 110 of the display device 100 according to an embodiment of the present disclosure, and the data line DL may be located between the first electrode layers 250 .

[0081] In order to separate each sub-pixel, a bank layer 240 overlapping at least a portion of the data line DL and at least a portion of the first electrode layer 250 may be included.

[0082] exist Figure 2 In the light emitted from each sub-pixel, the waveguide mode light that does not leave the light emitting layer 260 and propagates laterally can pass through Figure 2 The reflection area RA is extracted to the front.

[0083] Figure 2 The reflective area RA may overlap the bank layer 240 , and may not overlap the data line DL and the first electrode layer 250 .

[0084] Figure 2 The reflective area RA is shown only on two sides of the first electrode layer 250, but is not limited thereto. The reflective area RA may surround the entire emission area EA, may not be continuous (eg, the reflective area RA may have an island shape), or may surround only three sides of the emission area EA.

[0085] Figure 3 It is along Figure 2 A cross-sectional view taken along line AA'.

[0086] about Figure 3 The details of the data line DL, the first electrode layer 250 and the bank layer 240 may be the same as those in the above reference Figure 2 The details described about the data line DL, the first electrode layer 250, and the bank layer 240 are substantially the same.

[0087] Reference Figure 3 , the display device 100 according to an embodiment of the present disclosure may include a plurality of sub-pixels, each of which includes an emission area EA and a non-emission area NEA.

[0088] The display device 100 according to an embodiment of the present disclosure may include a buffer layer 210 disposed on a substrate 200 and a coating layer 230 disposed on the buffer layer 210 .

[0089] The coating layer 230 may include a recess 300 between the emission areas EA.

[0090] The recess 300 may consist of a flat portion FLT and a slope portion SLO surrounding the flat portion FLT.

[0091] The first electrode layer 250 may be disposed on the periphery of the recess 300 .

[0092] The first electrode layer 250 may include a conductive material that transmits light or semi-transmits light.

[0093] For example, the first electrode layer 250 may include at least one transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide, and tin oxide, or may include a semi-transparent metal such as magnesium, silver, and an alloy of magnesium and silver.

[0094] In this specification, the periphery of the recess 300 may mean a region other than the recess 300 .

[0095] The display device 100 according to an embodiment of the present disclosure may include a bank layer 240 covering at least a portion of the first electrode layer 250 and covering the concave portion 300 .

[0096] The light emitting layer 260 may be disposed on the first electrode layer 250 and the bank layer 240 .

[0097] The light emitting layer 260 of the light emitting element ED may be formed by a deposition or coating method having directionality.

[0098] For example, the light emitting layer 260 may be formed by physical vapor deposition (PVD).

[0099] The light emitting layer 260 may include a red organic light emitting layer disposed in the red sub-pixel (R), a green organic light emitting layer disposed in the green sub-pixel (G), and a blue organic light emitting layer disposed in the blue sub-pixel (B).

[0100] The second electrode layer 270 may be disposed on the light emitting layer 260 .

[0101] The second electrode layer 270 may include a reflective metal.

[0102] Figure 3 A configuration in which the second electrode layer 270 is a single layer is shown. However, the embodiments of the present disclosure are not limited thereto, and the second electrode layer 270 may be composed of a plurality of layers.

[0103] For example, when the second electrode layer 270 is composed of a plurality of layers, at least one layer may include a reflective metal.

[0104] For example, the second electrode layer 270 may include at least one of aluminum, neodymium, nickel, titanium, tantalum, copper, silver, and an aluminum alloy, but embodiments of the present disclosure are not limited thereto.

[0105] The bank layer 240 may include a recessed portion 400 exposing at least a partial region of the coating layer 230 .

[0106] The data line DL may be disposed on the substrate 200 and under the recess 300 .

[0107] The buffer layer 210 may cover the data line DL.

[0108] The color filter layer 220 may be disposed over the substrate 200 and cover at least a partial region of the data line DL.

[0109] The overcoat layer 230 may be disposed on the color filter layer 220 and the buffer layer 210 without being cut.

[0110] In this case, the overcoat layer 230 may have a level difference between a region where the color filter layer 220 is disposed and a region where the color filter layer 220 is not disposed.

[0111] For example, the overcoat layer 230 may be formed by being completely formed on the color filter layer 220 and the buffer layer 210 and then being etched in the region between the sub-pixels.

[0112] Figure 4 is a view showing a schematic planar structure of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0113] about Figure 4 The details of the data line DL, the first electrode layer 250, the bank layer 240 and the reflective area RA may be the same as those described above. Figure 2 The details described about the data line DL, the first electrode layer 250, the bank layer 240, and the reflective area RA are substantially the same.

[0114] Reference Figure 4 , may include a metal pattern layer 500 disposed to be spaced apart from the first electrode layer 250 and overlap the bank layer 240 .

[0115] The metal pattern layer 500 may include a reflective metal.

[0116] Figure 4 A configuration in which the metal pattern layer 500 is a single layer is shown. However, embodiments of the present disclosure are not limited thereto, and the metal pattern layer 500 may be composed of a plurality of layers.

[0117] For example, when the metal pattern layer 500 consists of a plurality of layers, at least one layer may include a reflective metal.

[0118] For example, the metal pattern layer 500 may include at least one of aluminum, neodymium, nickel, titanium, tantalum, copper, silver, and an aluminum alloy, but embodiments of the present disclosure are not limited thereto.

[0119] The material constituting the metal pattern layer 500 may be substantially the same as the material constituting the second electrode layer 270, but is not necessarily limited thereto. The metal pattern layer 500 may be formed of a different material selected from reflective metals.

[0120] In the display device 100 according to an embodiment of the present disclosure, the data line DL and the metal pattern layer 500 may overlap each other in at least a partial region, but are not limited thereto.

[0121] Figure 5 It is along Figure 4 A cross-sectional view taken along line BB'.

[0122] about Figure 5 The details of the substrate 200, the buffer layer 210, the color filter layer 220, the bank layer 240, the first electrode layer 250, the light emitting layer 260 and the second electrode layer 270 can be the same as those mentioned above. Figure 3 The details described about the substrate 200, the buffer layer 210, the color filter layer 220, the bank layer 240, the first electrode layer 250, the light emitting layer 260, and the second electrode layer 270 are substantially the same.

[0123] In addition, regarding Figure 5 The details of the metal pattern layer 500 can be referred to above. Figure 4 The details described about the metal pattern layer 500 are substantially the same.

[0124] Reference Figure 5 By providing the metal pattern layer 500 covering the slope portion SLO of the concave portion 300 , the extraction of the waveguide mode light can be maximized to improve the light efficiency of the light emitting element ED.

[0125] In addition, even when the bank layer 240 does not include the groove part 400 to extract the waveguide mode light, the metal pattern layer 500 may function as the groove part 400 .

[0126] The metal pattern layer 500 may be disposed to be spaced apart from the first electrode layer 250 .

[0127] Since the bank layer 240 is disposed between the metal pattern layer 500 and the first electrode layer 250 , it is possible to prevent the waveguide mode light from being reflected by the metal pattern layer 500 and not being released toward the substrate 200 and disappearing.

[0128] The bank layer 240 may be located between the metal pattern layer 500 and the first electrode layer 250. The bank layer 240 may cover a region between the metal pattern layer 500 and the first electrode layer 250.

[0129] Since the bank layer 240 is located between the metal pattern layer 500 and the first electrode layer 250 , a phenomenon in which the first electrode layer 250 including a conductive material that transmits or semi-transmits light and the metal pattern layer 500 including a reflective material affect each other can be prevented.

[0130] In the display device 100 according to the embodiment of the present disclosure, an angle a formed between the flat portion FLT of the recess 300 and the slope portion SLO of the recess 300 may be greater than or equal to 45 degrees.

[0131] The angle a formed by the flat portion FLT of the recess 300 and the slope portion SLO of the recess 300 means the angle a formed by a straight line extending from the flat portion FLT of the recess 300 and a straight line passing through the inflection point of the slope portion SLO of the recess 300 and simultaneously contacting the slope portion SLO of the recess 300 .

[0132] In this specification, an angle means an acute angle.

[0133] When the angle a formed by the flat portion FLT of the recess 300 and the slope portion SLO of the recess 300 is greater than or equal to 45 degrees, the angle c formed by the tangent of the embankment layer 240 passing through the following point and the periphery of the recess 300 can be designed to be less than or equal to 43 degrees, where the first electrode layer 250, the light-emitting layer 260 and the embankment layer 240 all intersect.

[0134] Since the angle c formed by the tangent line of the bank layer 240 passing through the point where the first electrode layer 250, the light emitting layer 260 and the bank layer 240 intersect and the periphery of the recess 300 is less than or equal to 43 degrees, the occurrence of dead pixels due to cutting of the second electrode layer 270 can be minimized.

[0135] In the display device 100 according to an embodiment of the present disclosure, the angle b formed by the line segment and the flat portion FLT of the recess 300 can be greater than or equal to 39 degrees and less than or equal to 60 degrees, and the line segment connects the boundary line of the first electrode layer 250 and the boundary line where the slope portion SLO of the recess 300 intersects with the flat portion FLT of the recess 300 at the shortest distance.

[0136] The line segment may be a hypotenuse of a triangle defined by a distance D between boundary lines where the boundary line of the first electrode layer 250 intersects the slope portion SLO and the flat portion FLT of the recess 300 and a thickness H of the second coating layer 232 to be described below.

[0137] The following [General Formula 1] can be established.

[0138] [General formula 1]

[0139] H / D=tan(b)

[0140] When the angle b is greater than or equal to 39 degrees and less than or equal to 60 degrees, substrate mode light and waveguide mode light can be efficiently extracted.

[0141] Reference Figure 5 The coating layer 230 may include a first coating layer 231 disposed over the substrate 200 and a second coating layer 232 disposed on the first coating layer 231 and including the slope portion SLO of the recess 300 .

[0142] The first coating layer 231 may be disposed on the color filter layer 220 and the buffer layer 210 without being cut.

[0143] In this case, the first coating layer 231 may have a level difference between a region where the color filter layer 220 is disposed and a region where the color filter layer 220 is not disposed.

[0144] The refractive index of the second coating layer 232 may be greater than the refractive index of the first coating layer 231 .

[0145] When the refractive index of the second coating layer 232 is greater than that of the first coating layer 231 , not only the extraction efficiency of the waveguide mode light but also the extraction efficiency of the substrate mode light emitted from the light emitting layer 260 but not released to the outside of the substrate 200 can be improved.

[0146] For example, the refractive index of the first coating layer 231 may be greater than or equal to 1.14 and less than or equal to 1.57, and the refractive index of the second coating layer 232 may be greater than or equal to 1.57 and less than or equal to 1.65.

[0147] Preferably, the refractive index of the first coating layer 231 may be greater than or equal to 1.14 and less than or equal to 1.46, and the refractive index of the second coating layer 232 may be greater than or equal to 1.63 and less than or equal to 1.65.

[0148] However, embodiments of the present disclosure are not necessarily limited thereto, and the refractive index of the second coating layer 232 may be equal to or less than the refractive index of the first coating layer 231 .

[0149] For another example, the refractive index of the first coating layer 231 and the second coating layer 232 may be 1.57.

[0150] For yet another example, the refractive index of the first coating layer 231 may be 1.57, and the refractive index of the second coating layer 232 may be 1.63.

[0151] Fresnel losses are proportional to a value obtained by dividing the refractive index of the first coating layer 231 by the refractive index of the second coating layer 232 .

[0152] In order to minimize Fresnel loss, the refractive index of the second coating layer 232 can be designed to be greater than the refractive index of the first coating layer 231, and preferably, the value obtained by dividing the refractive index of the first coating layer 231 by the refractive index of the second coating layer 232 is greater than or equal to 0.7.

[0153] Figure 6 is a view showing a schematic planar structure of a pixel structure provided in a display panel 110 of a display device 100 according to still another embodiment of the present disclosure.

[0154] about Figure 6 The details of the bank layer 240, the first electrode layer 250, the data line DL and the reflective area RA may be the same as those in the above reference. Figure 2 The details described about the bank layer 240, the first electrode layer 250, the data line DL, and the reflective area RA are substantially the same.

[0155] In addition, regarding Figure 6 The details of the second coating layer 232 can be referred to above. Figure 5 The details described regarding the second coating layer 232 are substantially the same.

[0156] Figure 7 It is along Figure 6 A cross-sectional view taken along line CC'.

[0157] about Figure 7 The details of the substrate 200, the buffer layer 210, the color filter layer 220, the bank layer 240, the first electrode layer 250, the light emitting layer 260, the second electrode layer 270, the groove portion 400 and the data line DL may be the same as those described above. Figure 2 The details described about the substrate 200, the buffer layer 210, the color filter layer 220, the bank layer 240, the first electrode layer 250, the light emitting layer 260, the second electrode layer 270, the groove part 400, and the data line DL are substantially the same.

[0158] In addition, regarding Figure 7 The details of the first coating layer 231 and the second coating layer 232 can be referred to above. Figure 5 The details described about the first coating layer 231 and the second coating layer 232 are substantially the same.

[0159] Reference Figure 7 , the coating layer 230 of the display device 100 according to an embodiment of the present disclosure may include a first coating layer 231 and a second coating layer 232 , and a refractive index of the second coating layer 232 may be greater than a refractive index of the first coating layer 231 .

[0160] When the refractive index of the second coating layer 232 is greater than that of the first coating layer 231 , not only the extraction efficiency of the waveguide mode light but also the extraction efficiency of the substrate mode light emitted from the light emitting layer 260 but not released to the outside of the substrate 200 can be improved.

[0161] For example, the refractive index of the first coating layer 231 may be greater than or equal to 1.14 and less than or equal to 1.57, and the refractive index of the second coating layer 232 may be greater than or equal to 1.57 and less than or equal to 1.65.

[0162] Preferably, the refractive index of the first coating layer 231 may be greater than or equal to 1.14 and less than or equal to 1.46, and the refractive index of the second coating layer 232 may be greater than or equal to 1.63 and less than or equal to 1.65.

[0163] However, embodiments of the present disclosure are not necessarily limited thereto, and the refractive index of the second coating layer 232 may be equal to or less than the refractive index of the first coating layer 231 .

[0164] For another example, the refractive index of the first coating layer 231 and the second coating layer 232 may be 1.57.

[0165] For yet another example, the refractive index of the first coating layer 231 may be 1.57, and the refractive index of the second coating layer 232 may be 1.63.

[0166] The Fresnel loss is proportional to a value obtained by dividing the refractive index of the first coating layer 231 by the refractive index of the second coating layer 232 .

[0167] In order to minimize Fresnel loss, the refractive index of the second coating layer 232 can be designed to be greater than the refractive index of the first coating layer 231, and preferably, the value obtained by dividing the refractive index of the first coating layer 231 by the refractive index of the second coating layer 232 is greater than or equal to 0.7.

[0168] Reference Figure 7 The bank layer 240 may include a groove portion 400 exposing at least a partial region of the first coating layer 231 , but is not necessarily limited thereto. The bank layer 240 may not expose the first coating layer 231 .

[0169] In the case where the bank layer 240 includes the groove part 400 , since the second electrode layer 270 is formed according to the shape of the groove part 400 when the second electrode layer 270 is formed on the light emitting layer 260 , substrate mode light and waveguide mode light may be efficiently extracted.

[0170] Preferably, in the recessed groove portion 400 of the bank layer 240 , an angle d formed by the upper surface of the first coating layer 231 and the bank layer 240 is less than or equal to 45 degrees.

[0171] The angle d formed by the upper surface of the first coating layer 231 and the bank layer 240 means an angle formed by the upper surface of the first coating layer 231 and a straight line passing through an inflection point of the bank layer 240 in the recessed portion 400 while contacting the bank layer 240 .

[0172] In the groove portion 400 of the bank layer 240 , when the angle d formed by the upper surface of the first coating layer 231 and the bank layer 240 is less than or equal to 45 degrees, the substrate mode light and the waveguide mode light may be efficiently extracted.

[0173] Therefore, in the present embodiment, the maximum height of the bank layer 240 may be lower than that of the bank layer 240 in other embodiments, and the bank layer 240 may be formed thinner than that of the bank layer 240 in other embodiments.

[0174] In the present embodiment, a distance D between a boundary line of the first electrode layer 250 and a boundary line where the slope portion SLO and the flat portion FLT of the recess 300 intersect may be formed to be longer than that in other embodiments.

[0175] like Figure 6 As shown, the width of the reflection area RA in this embodiment can be formed to be larger than the width of the reflection area RA in other embodiments.

[0176] The end of the second coating layer 232 contacts the end of the bank layer 240 on the first coating layer 231 and on a boundary line where the slope portion SLO of the recess 300 and the flat portion FLT of the recess 300 meet.

[0177] In the display device 100 according to an embodiment of the present disclosure, the angle e formed by the line segment and the flat portion FLT of the recess 300 can be greater than or equal to 12 degrees and less than or equal to 36 degrees, and the line segment connects the boundary line of the first electrode layer 250 and the boundary line where the slope portion SLO of the recess 300 intersects with the flat portion FLT of the recess 300 at the shortest distance.

[0178] The line segment may be a hypotenuse of a triangle defined by a distance D between boundary lines where the boundary line of the first electrode layer 250 intersects the slope portion SLO and the flat portion FLT of the recess 300 and a thickness H of the second coating layer 232 .

[0179] The following [General Formula 2] can be established.

[0180] [General formula 2]

[0181] H / D=tan(e)

[0182] When the angle e is greater than or equal to 12 degrees and less than or equal to 36 degrees, substrate mode light and waveguide mode light can be efficiently extracted.

[0183] A brief description of the above-mentioned embodiments of the present disclosure is as follows.

[0184] A display device according to an embodiment of the present disclosure may include: a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including an emission region and a non-emission region; a coating layer disposed above the substrate and having a recess between the emission regions; a first electrode layer disposed on the periphery of the recess; a metal pattern layer disposed to cover a slope portion of the recess; and a dam layer covering the recess and disposed on the metal pattern layer.

[0185] In the display device according to an embodiment of the present disclosure, the first electrode layer and the metal pattern layer may be disposed to be spaced apart from each other.

[0186] In the display device according to an embodiment of the present disclosure, the bank layer may cover at least a portion of the first electrode layer, and may be located between the first electrode layer and the metal pattern layer.

[0187] In the display device according to the embodiment of the present disclosure, an angle formed by the flat portion of the concave portion and the slope portion of the concave portion may be greater than or equal to 45 degrees.

[0188] In a display device according to an embodiment of the present disclosure, the display device may further include: a light-emitting layer, which is arranged on the first electrode layer and the embankment layer, wherein an angle formed by a tangent of the embankment layer passing through the following point and the periphery of the recess may be less than or equal to 43 degrees, and the first electrode layer, the light-emitting layer and the embankment layer all intersect at the said point.

[0189] In a display device according to an embodiment of the present disclosure, the angle formed by a line segment and the flat portion of the recess, wherein the line segment connects a boundary line of the first electrode layer and a boundary line where the slope portion of the recess intersects with the flat portion of the recess at the shortest distance, can be greater than or equal to 39 degrees and less than or equal to 60 degrees.

[0190] In a display device according to an embodiment of the present disclosure, the coating layer may include a first coating layer and a second coating layer, the first coating layer is disposed above the substrate, the second coating layer is disposed on the first coating layer and includes a slope portion of the recess, and the refractive index of the second coating layer may be greater than the refractive index of the first coating layer.

[0191] In the display device according to the embodiment of the present disclosure, a value obtained by dividing the refractive index of the first coating layer by the refractive index of the second coating layer may be greater than or equal to 0.7.

[0192] In the display device according to the embodiment of the present disclosure, the display device may further include: a data line disposed on the substrate and located below the concave portion.

[0193] In the display device according to an embodiment of the present disclosure, the display device may further include: a color filter layer disposed over the substrate and covering at least a partial area of ​​the data line.

[0194] A display device according to an embodiment of the present disclosure may include: a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including an emission region and a non-emission region; a coating layer disposed above the substrate and having a recess between the emission regions; a first electrode layer disposed on the periphery of the recess; and a dam layer covering a slope portion of the recess, wherein the coating layer may include a first coating layer and a second coating layer, the first coating layer being disposed above the substrate, the second coating layer being disposed on the first coating layer and including the slope portion of the recess, and wherein the refractive index of the second coating layer may be greater than the refractive index of the first coating layer.

[0195] In the display device according to an embodiment of the present disclosure, the refractive index of the first coating layer may be greater than or equal to 1.14 and less than or equal to 1.46, and the refractive index of the second coating layer may be greater than or equal to 1.63 and less than or equal to 1.65.

[0196] In the display device according to the embodiment of the present disclosure, a value obtained by dividing the refractive index of the first coating layer by the refractive index of the second coating layer may be greater than or equal to 0.7.

[0197] In the display device according to an embodiment of the present disclosure, the bank layer may include a groove portion exposing at least a partial region of the first coating layer.

[0198] In the display device according to an embodiment of the present disclosure, in the groove portion of the bank layer, an angle formed by the upper surface of the first coating layer and the bank layer may be less than or equal to 45 degrees.

[0199] In a display device according to an embodiment of the present disclosure, the angle formed by a line segment and the flat portion of the recess, wherein the line segment connects a boundary line of the first electrode layer and a boundary line where the slope portion of the recess intersects with the flat portion of the recess at the shortest distance, may be greater than or equal to 12 degrees and less than or equal to 36 degrees.

[0200] In the display device according to the embodiment of the present disclosure, the display device may further include: a data line disposed on the substrate and located below the concave portion.

[0201] In the display device according to an embodiment of the present disclosure, the display device may further include: a color filter layer disposed over the substrate and covering at least a partial area of ​​the data line.

[0202] A display device according to an embodiment of the present disclosure may include: a substrate; a plurality of sub-pixels, each of the plurality of sub-pixels including an emission region and a non-emission region; a coating layer, which is disposed above the substrate and has a recessed portion between the emission regions; a first electrode layer, which is disposed on the coating layer; a dam layer, which covers at least a portion of the first electrode layer and at least a portion of the recessed portion; and a light-emitting layer, which covers at least a portion of the first electrode layer and at least a portion of the dam layer, wherein at least a portion of the light-emitting layer overlaps with the recessed portion.

[0203] In a display device according to an embodiment of the present disclosure, the display device may further include a second electrode layer disposed on the light-emitting layer, wherein the first electrode layer does not overlap with the concave portion of the coating layer; and at least a portion of the second electrode layer overlaps with the concave portion of the coating layer.

[0204] In the display device according to an embodiment of the present disclosure, the display device may further include a reflective region, wherein the reflective region overlaps the bank layer and does not overlap the first electrode layer.

[0205] The above description is presented to enable any person skilled in the art to make and use the technical concept of the present disclosure, and the above description is provided in the context of a specific application and its requirements. Various modifications, additions and substitutions to the described embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. The above description and accompanying drawings provide examples of the technical concept of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical concept of the present disclosure.

Claims

1. A display device, comprising: a substrate, the substrate comprising a plurality of sub-pixels, each of the plurality of sub-pixels comprising an emission region and a non-emission region; a coating layer disposed over the substrate and having a recessed portion between the emission regions; a first electrode layer, the first electrode layer being disposed on the periphery of the recess; a metal pattern layer, the metal pattern layer being arranged to cover the slope portion of the concave portion; as well as A bank layer covers the concave portion and is disposed on the metal pattern layer.

2. The display device according to claim 1, wherein: The first electrode layer and the metal pattern layer are disposed to be spaced apart from each other.

3. The display device according to claim 1, wherein: The bank layer covers at least a portion of the first electrode layer, and the bank layer is located between the first electrode layer and the metal pattern layer.

4. The display device according to claim 1, wherein: An angle formed by the flat portion of the recess and the slope portion of the recess is greater than or equal to 45 degrees.

5. The display device according to claim 1, further comprising: a light-emitting layer, the light-emitting layer being disposed on the first electrode layer and the bank layer, The angle formed by a tangent line of the bank layer passing through the following point and the periphery of the concave portion is less than or equal to 43 degrees, and the first electrode layer, the light-emitting layer and the bank layer all intersect at the point.

6. The display device according to claim 1, wherein: An angle formed by a line segment and the flat portion of the recess is greater than or equal to 39 degrees and less than or equal to 60 degrees, and the line segment connects a boundary line of the first electrode layer and a boundary line where the slope portion of the recess intersects the flat portion of the recess at the shortest distance.

7. The display device according to claim 1, wherein: The coating layer includes a first coating layer and a second coating layer, the first coating layer is disposed above the substrate, the second coating layer is disposed on the first coating layer and includes a slope portion of the recess, and The refractive index of the second coating layer is greater than the refractive index of the first coating layer.

8. The display device according to claim 7, wherein: A value obtained by dividing the refractive index of the first coating layer by the refractive index of the second coating layer is greater than or equal to 0.

7.

9. The display device according to claim 1, further comprising: A data line is disposed on the substrate and below the concave portion.

10. The display device according to claim 9, further comprising: A color filter layer is disposed above the substrate and covers at least a portion of the data line.

11. A display device, comprising: a substrate, the substrate comprising a plurality of sub-pixels, each of the plurality of sub-pixels comprising an emission region and a non-emission region; a coating layer disposed over the substrate and having a recessed portion between the emission regions; a first electrode layer, the first electrode layer being disposed on the periphery of the recess; as well as a bank layer, the bank layer covering the slope portion of the recess, wherein the coating layer comprises a first coating layer and a second coating layer, the first coating layer is disposed above the substrate, the second coating layer is disposed on the first coating layer and comprises a slope portion of the recess, and Wherein, the refractive index of the second coating layer is greater than the refractive index of the first coating layer.

12. The display device according to claim 11, wherein: The refractive index of the first coating layer is greater than or equal to 1.14 and less than or equal to 1.46, and the refractive index of the second coating layer is greater than or equal to 1.63 and less than or equal to 1.

65.

13. The display device according to claim 11, wherein: A value obtained by dividing the refractive index of the first coating layer by the refractive index of the second coating layer is greater than or equal to 0.

7.

14. The display device according to claim 11, wherein: The bank layer includes a groove portion, and the groove portion exposes at least a partial region of the first coating layer.

15. The display device according to claim 14, wherein: In the groove portion of the bank layer, an angle formed by an upper surface of the first coating layer and the bank layer is less than or equal to 45 degrees.

16. The display device according to claim 11, wherein: An angle formed by a line segment and the flat portion of the recess is greater than or equal to 12 degrees and less than or equal to 36 degrees, and the line segment connects a boundary line of the first electrode layer and a boundary line where the slope portion of the recess intersects the flat portion of the recess at the shortest distance.

17. The display device according to claim 11, further comprising: A data line is disposed on the substrate and below the concave portion.

18. The display device according to claim 17, further comprising: A color filter layer is disposed above the substrate and covers at least a portion of the data line.

19. A display device comprising: substrate; a plurality of sub-pixels, each of the plurality of sub-pixels comprising an emissive region and a non-emissive region; a coating layer disposed over the substrate and having a recessed portion between the emission regions; a first electrode layer, wherein the first electrode layer is disposed on the coating layer; a bank layer covering at least a portion of the first electrode layer and at least a portion of the concave portion; as well as A light emitting layer covers at least a portion of the first electrode layer and at least a portion of the bank layer, wherein at least a portion of the light emitting layer overlaps with the concave portion.

20. The display device according to claim 19, further comprising a second electrode layer disposed on the light emitting layer, in: The first electrode layer does not overlap with the concave portion of the coating layer; and At least a portion of the second electrode layer overlaps with the concave portion of the coating layer.

21. The display device according to claim 19, further comprising a reflective area, in, The reflective region overlaps the bank layer and does not overlap the first electrode layer.

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