Display device

Abstract

A display panel may include a first sub-pixel and a second sub-pixel on a substrate, where the first sub-pixel and the second sub-pixel each include a first electrode, an emission layer, and a second electrode. The display panel further includes a first insulating layer between the emission layer and the substrate and including a first recessed portion between a first emission region of the first sub-pixel and a second emission region of the second sub-pixel, and a second insulating layer between the emission layer and the first insulating layer and including a second recessed portion between the first emission region and the second emission region. Further, the second electrode extends across the second recessed portion, and a portion of the second electrode is located in the second recessed portion and is closer to the substrate than both the first electrode in the first sub-pixel and the second sub-pixel or an upper surface of the first insulating layer.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0150977, filed on November 3, 2023, which is incorporated herein by reference as if fully set forth herein. Technical Field

[0003] The present disclosure relates to a display device having a bottom emission structure. Background Art

[0004] Based on the direction in which emitted light is irradiated, display devices can be classified into a bottom emission structure and a top emission structure. A display device having a bottom emission structure can irradiate emitted light downward, and a display device having a top emission structure can irradiate emitted light upward.

[0005] In a display device having a bottom emission structure, research is being conducted to improve light extraction efficiency by using a structure of a layer disposed under a light emitting device. Summary of the invention

[0006] Accordingly, the present disclosure is directed to a display device that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0007] One aspect of the present disclosure is directed to providing a display device in which an aperture ratio and light extraction efficiency can be improved.

[0008] Another aspect of the present disclosure is directed to providing a display device that can prevent the occurrence of a light leakage defect.

[0009] Another aspect of the present disclosure is directed to providing a display device that can have high emission efficiency at low power.

[0010] Additional advantages and features of the present disclosure will be described in part in the following description, and in part will become apparent to those skilled in the art when studying the following, or may be learned from the practice of the present disclosure. The purposes and other advantages of the present disclosure may be achieved and obtained by the structures specifically pointed out in the written description and its claims as well as the drawings.

[0011] One object of the present disclosure is to provide a display panel, which includes a first sub-pixel and a second sub-pixel arranged on a substrate, the first sub-pixel being adjacent to the second sub-pixel, and each of the first sub-pixel and the second sub-pixel includes a first electrode, an emission layer, a second electrode, a first insulating layer arranged between the emission layer and the substrate, the first insulating layer including a first concave portion arranged between a first emission region of the first sub-pixel and a second emission region of the second sub-pixel; and a second insulating layer arranged between the emission layer and the first insulating layer, the second insulating layer including a second concave portion arranged between the first emission region and the second emission region, wherein the second electrode extends across the second concave portion of the second insulating layer, a portion of the second electrode is arranged in the second concave portion, and the portion of the second electrode is closer to the substrate than both the first electrode in the first sub-pixel and the first electrode in the second sub-pixel, or closer to the substrate than the upper surface of the first insulating layer.

[0012] Another object of the present disclosure is to provide a display panel including a color filter layer disposed in at least one of a first sub-pixel and a second sub-pixel, wherein the first insulating layer includes an opening area exposing at least a portion of the color filter layer.

[0013] An object of the present disclosure is to provide a display panel, wherein the portion of the second electrode is configured to reflect light emitted from at least one of a first emission area and a second emission area in a direction toward a substrate.

[0014] Yet another object of the present disclosure is to provide a display panel, wherein the second insulating layer has a second refractive index greater than the first refractive index of the first insulating layer.

[0015] Another object of the present disclosure is to provide a display panel, wherein a first thickness of a first insulating layer in a region overlapping a first emission region or a second emission region is greater than a second thickness of a second insulating layer in a region overlapping the first emission region or the second emission region.

[0016] An object of the present disclosure is to provide a display panel, wherein the second insulating layer has a third thickness corresponding to a center of a second concave portion, and the third thickness is less than or equal to the second thickness.

[0017] Another object of the present disclosure is to provide a display panel, wherein the first insulating layer includes a first inclined surface corresponding to the first concave portion, the second insulating layer includes a second inclined surface corresponding to the second concave portion, and the first inclined surface is steeper than the second inclined surface.

[0018] One object of the present disclosure is to provide a display panel, wherein an emission layer extends across both a first sub-pixel and a second sub-pixel, the emission layer includes a third inclined surface corresponding to the second inclined surface of a second insulating layer, the second electrode includes a fourth inclined surface corresponding to the third inclined surface of the emission layer, and an angle of the fourth inclined surface of the second electrode corresponds to an angle of the second inclined surface of the second insulating layer.

[0019] Still another object of the present disclosure is to provide a display panel, wherein a lowermost portion of a second electrode between a first sub-pixel and a second sub-pixel is disposed closer to a substrate than an upper surface of a first insulating layer.

[0020] An object of the present disclosure is to provide a display panel, wherein a first insulating layer includes an opening area corresponding to a first concave portion, the opening area being a hole extending across opposite sides of the first insulating layer.

[0021] Another object of the present disclosure is to provide a display panel including a bank disposed on an edge of a first electrode in a first sub-pixel and on an edge of the first electrode in a second sub-pixel.

[0022] Another object of the present disclosure is to provide a display panel, wherein both a first insulating layer and a second insulating layer extend continuously across a non-emitting region between a first sub-pixel and a second sub-pixel, and the first insulating layer includes a first flat surface overlapping at least one of the first emission region and the second emission region, and a second flat surface overlapping the non-emitting region between the first sub-pixel and the second sub-pixel, and the second flat surface is arranged to be closer to the substrate than the first flat surface.

[0023] An object of the present disclosure is to provide a display panel in which a cross-section of a second electrode has a “V” shape or a “U” shape in a non-emission region between a first sub-pixel and a second sub-pixel.

[0024] Another object of the present disclosure is to provide a display panel, wherein the emission layer extends across both a first sub-pixel and a second sub-pixel, an outer edge of a first electrode in the first sub-pixel facing a first concave portion and a second concave portion directly contacts the emission layer, and an outer edge of a first electrode in the second sub-pixel facing the first concave portion and the second concave portion directly contacts the emission layer.

[0025] An object of the present disclosure is to provide a display panel, wherein a first inclined surface of a first insulating layer has a slope greater than or equal to 70 degrees, and a second inclined surface of a second organic insulating layer has a slope less than or equal to 45 degrees.

[0026] Another object of the present disclosure is to provide a display device, which includes a first organic insulating layer arranged on a substrate, the first organic insulating layer including a first inclined surface between a first sub-pixel and a second sub-pixel, a second organic insulating layer arranged on the first organic insulating layer, the second organic insulating layer including a second inclined surface arranged between the first sub-pixel and the second sub-pixel and at least partially overlapping with the first inclined surface, and a plurality of light-emitting devices, the plurality of light-emitting devices being respectively arranged in the first sub-pixel and the second sub-pixel on the second organic insulating layer, wherein a slope of the second inclined surface of the second organic insulating layer is smaller than a slope of the first inclined surface of the first organic insulating layer.

[0027] An object of the present disclosure is to provide a display device in which a first organic insulating layer is thicker than a second organic insulating layer.

[0028] Still another object of the present disclosure is to provide a display device, wherein the first organic insulating layer has a lower refractive index than the second organic insulating layer.

[0029] An object of the present disclosure is to provide a display device, wherein a first inclined surface of a first organic insulating layer has a slope greater than or equal to 70 degrees.

[0030] Another object of the present disclosure is to provide a display device, wherein the second inclined surface of the second organic insulating layer has a slope less than or equal to 45 degrees.

[0031] Another object of the present disclosure is to provide a display device, wherein a first organic insulating layer includes an organic material having a higher viscosity than that of a second organic insulating layer.

[0032] An object of the present disclosure is to provide a display device, wherein a first organic insulating layer includes an opening region between a first sub-pixel and a second sub-pixel, and a second organic insulating layer covers the opening region of the first organic insulating layer.

[0033] Still another object of the present disclosure is to provide a display device in which a thickness of a second organic insulating layer between a first sub-pixel and a second sub-pixel is thinner than a thickness of the second organic insulating layer in a region overlapping the first sub-pixel.

[0034] An object of the present disclosure is to provide a display device, wherein the first organic insulating layer further includes a first flat surface in a region overlapping with the first sub-pixel, and a second flat surface arranged at a height lower than the first flat surface in a region between the first sub-pixel and the second sub-pixel, and a first inclined surface connects the first flat surface to the second flat surface.

[0035] An object of the present disclosure is to provide a display device including a plurality of color filters in first and second sub-pixels, respectively, disposed between a substrate and a first organic insulating layer.

[0036] An object of the present disclosure is to provide a display device, wherein a first organic insulating layer includes an opening area between a first sub-pixel and a second sub-pixel exposing at least a portion of each of a plurality of color filters, and a second organic insulating layer covers at least a portion of each of the plurality of color filters exposed by the opening area between the first sub-pixel and the second sub-pixel.

[0037] Another object of the present disclosure is to provide a display device in which a plurality of color filters at least partially overlap each other between a first sub-pixel and a second sub-pixel.

[0038] Another object of the present disclosure is to provide a display device, wherein each of a plurality of light emitting devices includes a first electrode on a second organic insulating layer, an emission layer on the first electrode, and a second electrode on the emission layer, wherein the second electrode is a reflective electrode.

[0039] An object of the present disclosure is to provide a display device in which an emission layer continuously extends across and between a first subpixel and a second subpixel, and the emission layer contacts the entire area of ​​a first electrode.

[0040] An object of the present disclosure is to provide a display device in which a second electrode continuously extends across and between a first subpixel and a second subpixel, and the second electrode extends between the first subpixel and the second subpixel along a second inclined surface of a second organic insulating layer.

[0041] Another object of the present disclosure is to provide a display device including a bank disposed on a first electrode to cover an end portion of the first electrode.

[0042] According to the present disclosure, an inclined surface can be provided in each of the first organic insulating layer and the second organic insulating layer, and thus an inclined surface can be formed in the second electrode. According to the present disclosure, light emitted from the light emitting device and traveling to the side surface can be reflected by the inclined surface of the second electrode to change the light path to the forward direction, thereby improving light extraction efficiency.

[0043] In addition, according to the present disclosure, the inclined surface of the first organic insulating layer can have a high slope, so the separation distance between sub-pixels can be reduced. According to the present disclosure, the area of ​​the non-emission region can be reduced, and the aperture ratio can be improved.

[0044] Furthermore, according to the present disclosure, high transmission efficiency can be achieved at low power, and furthermore, power consumption can be reduced.

[0045] In addition, according to the present disclosure, the inclined surface of the second organic insulating layer can have a low slope, so the problem that the second electrode is not deposited on the inclined surface of the second organic insulating layer or is formed very thinly at the inclined surface of the second organic insulating layer can be solved. According to the present disclosure, the problem that water or oxygen penetrates into the light-emitting device to deteriorate the light-emitting device can be solved.

[0046] Furthermore, according to the present disclosure, the total thickness of the first organic insulating layer and the second organic insulating layer can be reduced, and thus a light leakage phenomenon in which light emitted from the light emitting device leaks to adjacent sub-pixels can be prevented from occurring.

[0047] It is to be understood that both the foregoing summary of the present disclosure and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application. The accompanying drawings illustrate aspects and embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0049] Figure 1 is a perspective view showing a display device according to an embodiment of the present disclosure;

[0050] Figure 2 is a block diagram schematically showing a configuration of a display device according to an embodiment of the present disclosure;

[0051] Figure 3 is a plan view showing an example of a pixel included in a display device according to an embodiment of the present disclosure;

[0052] Figure 4 It is shown Figure 3 A circuit diagram of an example of a sub-pixel is shown;

[0053] Figure 5 is shown along Figure 3 A cross-sectional view of an embodiment of a sub-pixel taken along line II' shown in FIG.

[0054] Figure 6 is a cross-sectional view showing an example of an optical path;

[0055] Figure 7 is shown along Figure 3 A cross-sectional view of another embodiment of a sub-pixel taken along line II' shown in FIG.

[0056] Figure 8 is a cross-sectional view showing an example of an ashing process on the second organic insulating layer;

[0057] Fig. 9is shown along Figure 3 A cross-sectional view of another embodiment of a sub-pixel taken along line II′ shown in FIG.

[0058] Fig.10 is shown along Figure 3 A cross-sectional view of another embodiment of a sub-pixel taken along line II′ is shown. DETAILED DESCRIPTION

[0059] Reference will now be made in detail to embodiments of the present disclosure, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the accompanying drawings to refer to the same or similar parts. The advantages and features of the present disclosure and methods of implementing the same will be illustrated by the following embodiments described with reference to the accompanying drawings. However, the present disclosure may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0060] The shapes, sizes, ratios, angles, and quantities disclosed in the drawings used to describe the embodiments of the present disclosure are merely examples, and therefore, the present disclosure is not limited to the details shown. The same reference numerals always represent the same elements. In the following description, when the detailed description of the related known functions or configurations is determined to be unnecessarily difficult to understand the key points of the present disclosure, the detailed description will be omitted.

[0061] In the case of using "including", "having" and "comprising" described in this specification, another part may be added unless "only-" is used. Unless otherwise specified, the singular term may include the plural form. When explaining an element, the element is interpreted as including a margin of error, although there is no clear description. When describing a positional relationship, for example, when the positional relationship between two parts is described as "on ...", "above ...", "below ..." and "next", one or more other parts may be arranged between the two parts, unless "just" or "directly". When describing a temporal relationship, for example, when the temporal sequence is described as "afterwards", "subsequently", "next" and "before", discontinuous situations may be included, unless "just" or "directly" is used. It should be understood that although the terms "first", "second" and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0062] The term "at least one" should be understood to include any and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of the first item, the second item, and the third item" means a combination of all items proposed from two or more of the first item, the second item, and the third item, as well as the first item, the second item, or the third item.

[0063] The features of the various embodiments of the present disclosure may be coupled or combined with each other in part or in their entirety, and may interoperate differently from each other and be driven technically, as those skilled in the art may fully appreciate. The embodiments of the present disclosure may be performed independently of each other, or may be performed together in an interdependent relationship. Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the accompanying drawings to refer to the same or similar parts.

[0064] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0065] Figure 1 is a perspective view showing a display device 100 according to an embodiment of the present disclosure. Figure 2 is a block diagram schematically showing a configuration of a display device 100 according to an embodiment of the present disclosure. Figure 3 is a plan view showing an example of a pixel included in the display device 100 according to an embodiment of the present disclosure.

[0066] The display device 100 according to an embodiment of the present disclosure may be described as being implemented as an organic light emitting display device, but is not limited thereto, and may be implemented as a liquid crystal display (LCD) device, a quantum dot light emitting diode display device, or an electrophoretic display device.

[0067] refer to Figure 1 and 2 According to an embodiment of the present disclosure, the display device 100 may include a display panel 110, a scan driver 120 embedded in the display panel 110, a data driver 130 connected to the display panel 110, a timing controller 160 controlling the scan driver 120 and the data driver 130, and a power supply circuit 180.

[0068] The display panel 110 may include a first substrate 111 and a second substrate 112. The second substrate 112 may be an encapsulation substrate. The first substrate 111 may include a plastic film or a glass substrate, but is not limited thereto. The first substrate 111 may include a semiconductor material such as a silicon wafer. The second substrate 112 may include a plastic film, a glass substrate, or an encapsulation film (protective film).

[0069] The display device 100 according to an embodiment of the present disclosure may be implemented as a bottom emission type that irradiates emitted light downward. In this case, the material of the first substrate 111 may use a transparent material, and the material of the second substrate 112 may use an opaque material as well as a transparent material.

[0070] The display panel 110 may include a display area DA and a non-display area NDA disposed outside the display area DA to surround the display area DA. The display panel 110 may include a plurality of pixels P disposed in the display area DA to display an image. Each pixel P may include two or more sub-pixels SP. For example, Figure 3 As shown, the pixel P may include a plurality of sub-pixels SP1 to SP3. The plurality of sub-pixels SP1 to SP3 may include a first sub-pixel SP1 emitting red light, a second sub-pixel SP2 emitting green light, and a third sub-pixel SP3 emitting blue light, but is not limited thereto. The plurality of sub-pixels SP1 to SP3 may further include a fourth sub-pixel emitting white light. In addition, the arrangement order of the sub-pixels SP1 to SP3 may be changed differently.

[0071] Data lines D1 to Dn (where n may be a positive integer of 2 or more) and scan lines S1 to Sm (where m may be a positive integer of 2 or more) connected to the sub-pixels SP1 to SP3 may be provided in the display panel 110. The data lines D1 to Dn may be formed to intersect the scan lines S1 to Sm. Each of the sub-pixels SP1 to SP3 of the display panel 110 may be connected to one of the data lines D1 to Dn and one of the scan lines S1 to Sm. The data lines D1 to Dn may provide a voltage provided from the data driver 130 to the sub-pixels SP1 to SP3. The scan lines S1 to Sm may provide a scan signal provided from the scan driver 120 to the sub-pixels SP1 to SP3.

[0072] Each of the sub-pixels SP1 to SP3 may be turned on by a scan signal, and when a data voltage of a data line is supplied to a gate electrode of a driving transistor, the light emitting device ED may emit light using a drain-source current of the driving transistor.

[0073] The scan driver 120 may be provided with a scan control signal GCS from the timing controller 160. The scan driver 120 may provide a scan signal or an emission control signal to the scan lines S1 to Sm by using the scan control signal GCS.

[0074] The scan driver 120 may be formed as a gate-in-panel (GIP) type in the non-display area NDA outside one or both sides of the display area DA. Alternatively, the scan driver 120 may be manufactured as a drive chip and may be mounted on a flexible film, and further, may be attached to the non-display area NDA outside one or both sides of the display area DA based on a tape automated bonding (TAB) type.

[0075] The data driver 130 may be provided with digital video data DATA and a data control signal DCS from the timing controller 160. The data driver 130 may convert the digital video data DATA into analog positive / negative data voltages by using the data control signal DCS and may provide the analog positive / negative data voltages to the data lines D1 to Dn.

[0076] like Figure 1 As shown, the data driver 130 may include a plurality of data driver integrated chips (ICs) 131. Each of the plurality of data driver ICs 131 may be mounted on a circuit film 140 based on a chip on film (COF) type, a chip on plastic (COP) type, a flexible printed circuit (FPC) type, or a flexible flat cable (FFC) type. The circuit film 140 may be attached to a pad provided in the non-display area NDA of the display panel 110 by using an anisotropic conductive film, and thus, the plurality of data driver ICs 131 may be connected to the pad.

[0077] The circuit board 150 may be attached on the circuit film 140. A plurality of circuits implemented as a driving chip may be mounted on the circuit board 150. For example, the timing controller 160 may be mounted on the circuit board 150. The circuit board 150 may be a printed circuit board (PCB) or a flexible PCB (FPCB).

[0078] The digital video data DATA and the timing signal may be provided from the host system to the timing controller 160. The timing signal may include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a dot clock. The vertical synchronization signal may be a signal defining a frame period. The horizontal synchronization signal may be a signal defining a horizontal period required to provide a data voltage to pixels of a horizontal line of the display panel 110. The data enable signal may be a signal defining a period for inputting valid data. The dot clock may be a signal repeated in a short period.

[0079] The timing controller 160 may generate a data control signal DCS for controlling the operation timing of the data driver 130 and a scan control signal GCS for controlling the operation timing of the scan driver 120 based on the timing signal. The timing controller 160 may output the scan control signal GCS to the scan driver 120, and may output the digital video data DATA and the data control signal DCS to the data driver 130.

[0080] The power circuit 180 may generate and provide a plurality of driving voltages required for the operation of all circuit elements of the display device 100 by using an input voltage. The power circuit 180 may generate a first source voltage EVDD, a second source voltage EVSS, an initialization voltage (reference voltage) Vref, and may provide the generated voltages to the display panel 110. The power circuit 180 may generate and provide various driving voltages required for the operation of the scan driver 120, the data driver 130, and the timing controller 160.

[0081] Figure 4 It is shown Figure 3 A circuit diagram of an example of a sub-pixel is shown.

[0082] refer to Figure 3 and Figure 4 , each of the sub-pixels SP1 to SP3 may have a 2T (transistor) 1C (capacitor) structure including two transistors DT and ST and one capacitor Cst, but the embodiments of the present disclosure are not limited thereto. Each of the sub-pixels SP1 to SP3 may further include a compensation circuit Cc. In this case, each of the sub-pixels SP1 to SP3 may have various structures such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, and 7T2C.

[0083] Each of the transistors DT and ST of each of the sub-pixels SP1 to SP3 may include a gate electrode, a source electrode, and a drain electrode. The source electrode and the drain electrode may not be fixed and may change based on the direction of each of the voltage and current applied to the gate electrode, and therefore, one of the source electrode and the drain electrode may be referred to as a first electrode and the other may be referred to as a second electrode. The transistors DT and ST of each of the sub-pixels SP1 to SP3 may use at least one of a polycrystalline silicon semiconductor, an amorphous silicon semiconductor, and an oxide semiconductor. The transistor DT and the transistor ST may each be a P-type, an N-type, or a combination of a P-type and an N-type.

[0084] The light emitting device ED may include an anode electrode connected to the driving transistor DT, a cathode electrode supplied with a second source voltage EVSS through a second power line PL2, and an emission layer between the anode electrode and the cathode electrode. The anode electrode may be an independent electrode for each light emitting device, and the cathode electrode may be a common electrode shared by all light emitting devices. When a driving current is supplied from the driving transistor DT to the light emitting device ED, electrons from the cathode electrode may be supplied to the emission layer, holes from the anode electrode may be supplied to the emission layer, and the electrons and holes may be recombined in the emission layer to allow the fluorescent or phosphor material to emit light, thereby emitting light having a brightness proportional to the current value of the driving current.

[0085] In each of the sub-pixels SP1 to SP3, the driving transistor DT may be connected between the anode electrode of the light emitting device ED and the first power line PL1 transmitting the driving voltage EVDD. Here, the driving voltage EVDD may be applied to the first electrode of the driving transistor DT.

[0086] The driving transistor DT may be a transistor for driving the light emitting device ED, and may be controlled by a voltage applied to a gate electrode, and thus may supply current to the light emitting device ED. Thus, the light emitting device ED may be driven.

[0087] In each of the subpixels SP1 to SP3, the switching transistor ST may be connected between the first node N1 of the driving transistor DT and the data line D. The switching transistor ST may be controlled by a scan signal Scan provided through the scan line S to apply a data voltage Vdata provided through the data line D to the first node N1.

[0088] In each of the sub-pixels SP1 to SP3, the capacitor Cst may be connected to the first node N1 and may be charged with a voltage applied to the first node N1. The capacitor Cst may provide a charged driving voltage to the driving transistor DT. The capacitor Cst may be a storage capacitor.

[0089] A compensation circuit Cc may be provided to compensate for the threshold voltage of the driving transistor DT. The compensation circuit Cc may be configured with one or more transistors. The compensation circuit Cc may include one or more transistors and capacitors, and may be variously configured according to the compensation method. A pixel including the compensation circuit Cc may have various structures, such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, and 7T2C.

[0090] The display device 100 according to an embodiment of the present disclosure may have a bottom emission structure in which light emitted from the light emitting device ED is irradiated downward. In the display device 100 according to an embodiment of the present disclosure, the structure of the layer disposed below the light emitting device ED may be modified, and thus, the extraction efficiency of the light emitted from the light emitting device ED may be improved. Figures 5 to 10 The structure for improving light extraction efficiency is described in more detail.

[0091] Figure 5 is shown along Figure 3 A cross-sectional view of an embodiment of a sub-pixel taken along line II' shown in FIG. Figure 6 is a cross-sectional view showing an example of a light path.

[0092] refer to Figure 5According to an embodiment of the present disclosure, the display panel 110 may include a first substrate 111 and a second substrate 112 facing each other, and a circuit element layer 210, a color filter layer 220, an organic insulating layer 230, a light emitting device layer 240 and an encapsulation layer 250, all of which are arranged between the first substrate 111 and the second substrate 112.

[0093] In the circuit element layer 210, circuit elements including various signal lines, thin film transistors (TFTs), and capacitors may be provided for each of the sub-pixels SP1 to SP3. The signal lines may include scan lines, data lines, and power lines, and the TFTs may include switching transistors and driving transistors. In addition, the circuit element layer 210 may further include a plurality of insulating layers stacked on the first substrate 111.

[0094] The color filter layer 220 may be disposed on the circuit element layer 210. The color filter layer 220 may be patterned and formed for each of the sub-pixels SP1 to SP3. In detail, the color filter layer 220 may include a first color filter CF1, a second color filter CF2, and a third color filter CF3 (not shown). The first color filter CF1 may be disposed to correspond to the emission area EA1 of the first sub-pixel SP1, for example, a red color filter that transmits red light. The second color filter CF2 may be disposed to correspond to the emission area EA2 of the second sub-pixel SP2, for example, a green color filter that transmits green light. The third color filter (not shown) may be disposed to correspond to the emission area (not shown) of the third sub-pixel SP3, for example, a blue color filter that transmits blue light. When the pixel further includes a fourth sub-pixel, the color filter layer 220 may further include a fourth color filter (not shown). The fourth color filter (not shown) may be disposed to correspond to the emission area of ​​the fourth sub-pixel, for example, a white color filter that transmits white light. The white color filter may include a transparent organic material that transmits white light, but the embodiments of the present disclosure are not limited thereto. The white filter may be omitted.

[0095] like Figure 5 As shown, the first color filter CF1, the second color filter CF2, and the third color filter may at least partially overlap in the region between the sub-pixels SP1 to SP3, but the embodiments of the present disclosure are not limited thereto. The first color filter CF1, the second color filter CF2, and the third color filter may also be configured to be spaced apart from each other in the region between the sub-pixels SP1 to SP3.

[0096] The organic insulating layer 230 may be disposed on the color filter layer 220. The organic insulating layer 230 may include two organic insulating layers having different refractive indices in order to improve extraction efficiency of light emitted from the light emitting device ED. The organic insulating layer 230 may include a first organic insulating layer OC1 and a second organic insulating layer OC2.

[0097] The first organic insulating layer OC1 may be disposed on the color filter layer 220 and may have a first refractive index. The second organic insulating layer OC2 may be disposed on the first organic insulating layer OC1 and may have a second refractive index. For example, the second refractive index may be greater than the first refractive index. Figure 5 As shown, the first organic insulating layer OC1 may be disposed between the emission layer EL and the first substrate 111. The second organic insulating layer OC2 may be disposed between the emission layer EL and the first organic insulating layer OC1.

[0098] The second organic insulating layer OC2 may have a refractive index greater than that of the first organic insulating layer OC1, and thus light emitted from the light emitting device ED may be refracted or reflected by an interface between the second organic insulating layer OC2 and the first organic insulating layer OC1, thereby changing the optical path. The light extraction efficiency of the display panel 110 according to an embodiment of the present disclosure may be improved by changing the optical path.

[0099] In addition, the first organic insulating layer OC1 and the second organic insulating layer OC2 may each include an inclined surface in a region between the sub-pixels SP1 to SP3 .

[0100] In detail, the first organic insulating layer OC1 may include a first flat surface S11 formed in a region overlapping each of the sub-pixels SP1 to SP3 and a first concave portion CV1 concavely formed in a region between the sub-pixels SP1 to SP3 to face the first substrate 111. Figure 5 As shown, the first concave portion CV1 of the first organic insulating layer OC1 may be disposed between the emission area EA1 of the first sub-pixel SP1 and the emission area EA2 of the second sub-pixel SP2, and may include an opening area OA that exposes at least a portion of each of the color filters CF1 and CF2. In this case, the first concave portion CV1 of the first organic insulating layer OC1 may include an inclined surface S12 (hereinafter referred to as a first inclined surface) formed on at least one side of the opening area OA. The first inclined surface S12 may have a high first slope θ1. In an embodiment, the first slope θ1 may be 70 degrees or more.

[0101] The first inclined surface S12 may have a high first slope θ1, and thus, the first organic insulating layer OC1 may have a relatively thick first thickness T1. The first organic insulating layer OC1 may include an organic material. The thickness and flatness of the organic material may vary based on viscosity. The first organic insulating layer OC1 may include an organic material having a high first viscosity. For example, the first organic insulating layer OC1 may include photo propylene (PAC). Compared to the second organic insulating layer OC2, the first organic insulating layer OC1 may have a thicker first thickness T1, and the surface of the first organic insulating layer OC1 may be uniformly flattened.

[0102] In the display panel 110 according to the embodiment of the present disclosure, the first inclined surface S12 of the first organic insulating layer OC1 may have a high first slope θ1, and thus, a separation distance between the sub-pixels SP1 to SP3 may be reduced.

[0103] The second organic insulating layer OC2 may include a first flat surface S21 formed in a region overlapping each of the sub-pixels SP1 to SP3 and a second concave portion CV2 concavely formed in a region between the sub-pixels SP1 to SP3 to face the first substrate 111. At least a portion of the second concave portion CV2 of the second organic insulating layer OC2 may overlap the first concave portion CV1 of the first organic insulating layer OC1.

[0104] like Figure 5 As shown, the second concave portion CV2 of the second organic insulating layer OC2 may be disposed between the emission area EA1 and the emission area EA2, and may be formed to cover the color filters CF1 and CF2 exposed by the opening area OA of the first organic insulating layer OC1. In this case, the second concave portion CV2 of the second organic insulating layer OC2 may include a second flat surface S23 and an inclined surface S22 (hereinafter referred to as the second inclined surface), each of which is disposed at a height lower than the first flat surface S21. The second inclined surface S22 may be disposed on at least one side of the second flat surface S23, and may be a surface connecting the first flat surface S21 to the second flat surface S23. At least a portion of the second inclined surface S22 may overlap with the first inclined surface S12 of the first organic insulating layer OC1. Figure 5 , it is shown that the second flat surface S23 is formed at the second concave portion CV2, but the embodiments of the present disclosure are not limited thereto. In the second concave portion CV2 of the second organic insulating layer OC2, the second flat surface S23 may be omitted based on the separation distance between the sub-pixels SP1 to SP3 or the viscosity of the organic material of the second organic insulating layer OC2. Alternatively, in the second concave portion CV2 of the second organic insulating layer OC2, the second flat surface S23 may not be a flat surface.

[0105] The second inclined surface S22 of the second organic insulating layer OC2 may have a second slope θ2 lower than the first inclined surface S12 of the first organic insulating layer OC1. In an embodiment, the second slope θ2 may be 45 degrees or less.

[0106] The second inclined surface S22 may have a low second slope θ2, and therefore, the second organic insulating layer OC2 may have a relatively thin second thickness T2. When the second thickness T2 of the second organic insulating layer OC2 is thicker, the horizontal distance of the second inclined surface S22 of the second organic insulating layer OC2 may increase so that the second slope θ2 is formed to be 45 degrees or less. The thickness of the first organic insulating layer OA1 may be thicker than the thickness of the second organic insulating layer OA2. As the horizontal distance of the second inclined surface S22 of the second organic insulating layer OC2 increases, the separation distance between the sub-pixels SP1 to SP3 may increase. Therefore, the aperture ratio of the display panel 110 may be reduced. In the display panel 110 according to an embodiment of the present disclosure, the second thickness T2 of the second organic insulating layer OC2 may be formed to be thin, and therefore, the second slope θ2 of the second inclined surface S22 of the second organic insulating layer OC2 may be formed to be 45 degrees or less, and the separation distance between the sub-pixels SP1 to SP3 may not increase.

[0107] The second organic insulating layer OC2 may include an organic material. The thickness and planarization characteristics of the organic material may vary based on viscosity. The second organic insulating layer OC2 may include an organic material having a low second viscosity. For example, the second organic insulating layer OC2 may include polyimide (PI) or a siloxane-based organic material. The second organic insulating layer OC2 may have a second thickness T2 that is thinner than the first organic insulating layer OC1, and planarization may not be achieved in the second concave portion CV2. Therefore, the second organic insulating layer OC2 may sufficiently ensure the area of ​​the second inclined surface S22 in the second concave portion CV2.

[0108] The second organic insulating layer OC2 (or second concave portion CV2) may be formed to cover the color filters CF1 and CF2 exposed by the opening area OA of the first organic insulating layer OC1. Therefore, the second organic insulating layer OC2 may prevent gas degassed from the color filters CF1 and CF2 from moving to the light emitting device ED.

[0109] The light emitting device layer 240 may be disposed on the organic insulating layer 230. The light emitting device layer 240 may include light emitting devices ED respectively included in the sub-pixels SP1 to SP3. Each of the light emitting devices ED may include a first electrode E1, an emission layer EL, and a second electrode E2.

[0110] The first electrode E1 may be disposed on the organic insulating layer 230. In detail, for each of the sub-pixels SP1 to SP3, the first electrode E1 may be disposed on the first flat surface S21 of the second organic insulating layer OC2. In addition, the first electrode E1 may be connected to the driving transistor DT (see Figure 4 In detail, the first electrode E1 may be connected to one of the source electrode and the drain electrode of the driving transistor DT through a contact hole (see Figure 4 ), the contact hole passes through the organic insulating layer 230 and at least a portion of each of the plurality of insulating layers included in the circuit element layer 210.

[0111] The edge of at least one side of the first electrode E1 may be the same as the edge of each of the emission areas EA1 and EA2. In the display panel 110 according to the embodiment of the present disclosure, a separate bank may not be formed on the first electrode E1. Therefore, the emission layer EL may be formed to contact the entire area of ​​the first electrode E1, and light may be emitted from the emission layer EL. The bank may not be formed in the edge area of ​​the first electrode E1, and the first electrode E1 may contact the emission layer EL, and therefore, the edge of at least one side of the first electrode E1 may be the same as the edge of each of the emission areas EA1 and EA2. Figure 5 As shown, an edge of the first electrode E1 included in the first subpixel SP1 facing the second subpixel SP2 may be the same as an edge of the first emission area EA1, and an edge of the first electrode E1 included in the second subpixel SP2 facing the first subpixel SP1 may be the same as an edge of the second emission area EA2. The non-emission area NEA may be located between an end of the first electrode E1 included in the second subpixel SP2 and the first electrode E1 included in the second subpixel SP2. In the display panel 110 according to an embodiment of the present disclosure, since a separate dam is formed on the first electrode E1, the areas of the emission areas EA1 and EA2 may be increased, and the aperture ratio may be improved.

[0112] The first electrode E1 may include a transparent conductive material (TCO) capable of transmitting light, such as indium tin oxide (ITO) or indium zinc oxide (IZO). The first electrode E1 may include a semi-transmissive conductive material, such as magnesium (Mg), silver (Ag), or an alloy of Mg and Ag, and may have a thin thickness that enables transmission of light. When the first electrode E1 includes a semi-transmissive conductive material, the light output efficiency of the first electrode E1 may be increased by a microcavity. The first electrode E1 may be an anode electrode of the light emitting device ED.

[0113] The emission layer EL may be disposed on the first electrode E1. The emission layer EL may include an emission material layer (EML) including an emission material. The emission material may include an organic material, an inorganic material, or a mixed material. The emission layer EL may have a multilayer structure. For example, the emission layer EL may further include a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). In this case, when a voltage is applied to the first electrode E1 and the second electrode E2, holes and electrons may move to the emission material layer through the hole transport layer and the electron transport layer, and may combine in the emission material layer to emit light.

[0114] In one embodiment, the emission layer EL may be a common layer formed together in the sub-pixels SP1 to SP3. In this case, the emission layer EL may be a white emission layer that emits white light. In addition, in addition to the sub-pixels SP1 to SP3, the emission layer EL may also be formed in the region between the sub-pixels SP1 to SP3. The emission layer EL may be continuously formed in the sub-pixels SP1 to SP3 and between the sub-pixels SP1 to SP3. The emission layer EL may be formed on the second concave portion CV2 of the second organic insulating layer OC2 between the sub-pixels SP1 to SP3, and may be formed along the second inclined surface S22. An inclined surface ELS (hereinafter referred to as a third inclined surface) that at least partially overlaps the second inclined surface S22 of the second organic insulating layer OC2 may be formed in the emission layer EL.

[0115] In another embodiment, an emission layer EL may be formed for each of the sub-pixels SP1 to SP3. For example, a red emission layer emitting red light may be formed in the first sub-pixel SP1, a green emission layer emitting green light may be formed in the second sub-pixel SP2, and a blue emission layer emitting blue light may be formed in the third sub-pixel SP3.

[0116] The second electrode E2 may be disposed on the emission layer EL. The second electrode E2 may be a common layer formed in common in the sub-pixels SP1 to SP3. In addition to the sub-pixels SP1 to SP3, the second electrode E2 may be formed in a region between the sub-pixels SP1 to SP3. The second electrode E2 may be continuously formed in the sub-pixels SP1 to SP3 and between the sub-pixels SP1 to SP3. The second electrode E2 may be formed on the second concave portion CV2 of the second organic insulating layer OC2 between the sub-pixels SP1 to SP3, and may be formed along the second inclined surface S22. In the case where the emission layer EL is provided as a common layer, as shown in FIG. Figure 5As shown, the second electrode E2 may be formed on the third inclined surface ELS of the emission layer EL along the third inclined surface ELS. An inclined surface ES (hereinafter referred to as a fourth inclined surface) at least partially overlapping the second inclined surface S22 of the second organic insulating layer OC2 may be formed in the second electrode E2.

[0117] The second electrode E2 may include a conductive material having high reflectivity. The second electrode E2 may include a metal such as aluminum (Al), silver (Ag), titanium (Ti), or a silver-palladium-copper (APC) alloy. The second electrode E2 may be a cathode electrode.

[0118] The display panel 110 according to an embodiment of the present disclosure may include a first concave portion CV1 of the first organic insulating layer OC1 and a second concave portion CV2 of the second organic insulating layer OC2. Figure 5 As shown, the second electrode E2 may extend across the second concave portion CV2. A portion of the second electrode E2 may be disposed in the second concave portion CV2. The portion of the second electrode E2 may be closer to the first substrate 111 than both the first electrode E1 in the first subpixel SP1 and the first electrode E1 in the second subpixel SP2, or may be closer to the first substrate 111 than the upper surface of the first organic insulating layer OC1. The upper surface may refer to a surface of the first organic insulating layer OC1 on a side away from the first substrate 111. Therefore, the fourth inclined surface ES may be formed in the second electrode E2. In the display panel 110 according to an embodiment of the present disclosure, as shown in FIG. Figure 6 As shown, when the light L emitted from the light emitting device ED moves to the side surface, the light L may be reflected by the fourth inclined surface ES (or the third inclined surface ELS) included in the second electrode E2 (or in the emission layer EL), and thus the path of the light L may be changed to a forward direction. Here, the forward direction may refer to a direction toward the first substrate 111. Therefore, the display panel 110 according to an embodiment of the present disclosure may improve light extraction efficiency and may prevent color mixing between adjacent sub-pixels SP1 to SP3.

[0119] The encapsulation layer 250 may be disposed on the light emitting device layer 240. The encapsulation layer 250 may prevent the light emitting device ED from being damaged by external water and impact. The encapsulation layer 250 may have a multi-layer structure. For example, the encapsulation layer 250 may include at least one inorganic layer and at least one organic layer.

[0120] In the display panel 110 according to the embodiment of the present disclosure, the second organic insulating layer OC2 may have a refractive index greater than that of the first organic insulating layer OC1, and thus, light emitted from the light emitting device ED may be refracted or reflected by an interface between the second organic insulating layer OC2 and the first organic insulating layer OC1, thereby changing the optical path. The light extraction efficiency of the display panel 110 according to the embodiment of the present disclosure may be improved by changing the optical path.

[0121] Furthermore, in the display panel 110 according to the embodiment of the present disclosure, the first organic insulating layer OC1 may have a thicker first thickness T1, and thus, a step height occurring in the circuit element layer 210 and the color filter layer 220 may be planarized.

[0122] In addition, in the display panel 110 according to the embodiment of the present disclosure, the first organic insulating layer OC1 may include a first concave portion CV1 including a first inclined surface S12 in a region between the sub-pixels SP1 to SP3. Therefore, in the display panel 110 according to the embodiment of the present disclosure, the inclined surfaces S22, ELS, and ES may be formed in the second organic insulating layer OC2, the emission layer EL, and the second electrode E2, respectively, and the second organic insulating layer OC2, the emission layer EL, and the second electrode E2 are sequentially stacked on the first inclined surface S12 of the first organic insulating layer OC1.

[0123] In particular, in the display panel 110 according to the embodiment of the present disclosure, the second electrode E2 as a reflective electrode may include an inclined surface ES inclined toward the first substrate 111 and disposed in a region between the sub-pixels SP1 to SP3, thereby improving light extraction efficiency. In the display panel 110 according to the embodiment of the present disclosure, light L emitted from the light emitting device ED and moving to the side surface may be reflected by the inclined surface ES of the second electrode E2, and thus the path of the light L may be changed to a forward direction. Therefore, the display panel 110 according to the embodiment of the present disclosure may improve light extraction efficiency and may prevent color mixing between adjacent sub-pixels SP1 to SP3.

[0124] In addition, in the display panel 110 according to the embodiment of the present disclosure, the thickness T1 of the first organic insulating layer OC1 can be formed to be thick, and therefore, the depth (or vertical distance) of the first concave portion CV1 can be formed to be deep. Therefore, the area of ​​the first inclined surface S12 of the first concave portion CV1 can be increased. In the display panel 110 according to the embodiment of the present disclosure, the area of ​​each of the inclined surfaces S22, EL, and ES of the second organic insulating layer OC2, the emission layer EL, and the second electrode E2 stacked sequentially on the first inclined surface S12 of the first concave portion CV1 can be increased. As a result, in the display panel 110 according to the embodiment of the present disclosure, the inclined surface ES of the second electrode E2 can have a large area, and therefore, it is possible to increase the area on which light can be incident, thereby improving light extraction efficiency. The display panel 110 according to the embodiment of the present disclosure can have high light extraction efficiency at low power, and further, power consumption can be reduced.

[0125] In addition, in the display panel 110 according to the embodiment of the present disclosure, the first inclined surface S12 of the first organic insulating layer OC1 may have a high first slope θ1, and thus, the separation distance between the sub-pixels SP1 to SP3 may be reduced. In the display panel 110 according to the embodiment of the present disclosure, the area of ​​the non-emission area NEA may be reduced, and the aperture ratio may be improved.

[0126] In addition, in the display panel 110 according to an embodiment of the present disclosure, the second inclined surface S22 of the second organic insulating layer OC2 may have a second slope θ2 lower than the first inclined surface S12 of the first organic insulating layer OC1. The emission layer EL and the second electrode E2 may be formed on the second inclined surface S22 of the second organic insulating layer OC2. The emission layer EL may include an organic material and may be formed to have a uniform thickness on the second organic insulating layer OC2. That is, a large difference may not occur between the thickness of the emission layer EL on the first flat surface S21 of the second organic insulating layer OC2 and the thickness of the emission layer EL on the second inclined surface S22 of the second organic insulating layer OC2.

[0127] On the other hand, the second electrode E2 may include a reflective metal material and step coverage may not be good. The thickness of the second electrode E2 on the second inclined surface S22 of the second organic insulating layer OC2 may be formed thinner than the thickness of the second electrode E2 on the first flat surface S21 of the second organic insulating layer OC2.

[0128] As the slope of the second inclined surface S22 of the second organic insulating layer OC2 increases, the thickness of the second electrode E2 deposited on the second inclined surface S22 of the second organic insulating layer OC2 may be formed to be thin. In the second electrode E2, as the thickness on the second inclined surface S22 of the second organic insulating layer OC2 decreases, a region where the second electrode E2 is not deposited may appear, or a crack may appear. In this case, the second electrode E2 may not completely cover the emission layer EL, and therefore, water or oxygen may penetrate into the emission layer EL, resulting in degradation of the light emitting device ED.

[0129] In the display panel 110 according to the embodiment of the present disclosure, the second inclined surface S22 of the second organic insulating layer OC2 may have a low second slope θ2, and thus the second electrode E2 may be deposited on the second inclined surface S22 of the second organic insulating layer OC2 to have a certain thickness or more. In the display panel 110 according to the embodiment of the present disclosure, the second electrode E2 may not be deposited or may be thinly formed on the second inclined surface S22 of the second organic insulating layer OC2, and thus the light emitting device ED may be prevented from being degraded.

[0130] In addition, in the display panel 110 according to the embodiment of the present disclosure, the thickness T2 of the second organic insulating layer OC2 may be formed to be thin, and thus, even when the second inclined surface S22 of the second organic insulating layer OC2 has a low second slope θ2, the separation distance between the sub-pixels SP1 to SP3 may not increase. In addition, in the display panel 110 according to the embodiment of the present disclosure, the total thickness of the first organic insulating layer OC1 and the second organic insulating layer OC2 may be reduced, and thus, a light leakage phenomenon in which light emitted from the light emitting device ED leaks to the adjacent sub-pixels SP1 to SP3 may be prevented from occurring.

[0131] Figure 7 is shown along Figure 3 A cross-sectional view of another embodiment of a sub-pixel taken along line II' shown in FIG. Figure 8 is a cross-sectional view showing an example of an ashing process on the second organic insulating layer;

[0132] Except for the organic insulating layer OC, Figure 7 The other elements of the display panel 110 shown in FIG. Figure 5 The display panels 110 shown in FIGS. 1 and 10 are substantially the same, and thus their detailed descriptions are omitted.

[0133] refer to Figure 7According to another embodiment of the present disclosure, a display panel 110 may include a first substrate 111 and a second substrate 112 facing each other, and a circuit element layer 210, a color filter layer 220, an organic insulating layer 230, a light emitting device layer 240 and an encapsulation layer 250, all of which are arranged between the first substrate 111 and the second substrate 112.

[0134] The organic insulating layer 230 may be disposed on the color filter layer 220. The organic insulating layer 230 may include two organic insulating layers having different refractive indices in order to improve extraction efficiency of light emitted from the light emitting device ED. The organic insulating layer 230 may include a first organic insulating layer OC1 and a second organic insulating layer OC2.

[0135] The first organic insulating layer OC1 may be disposed on the color filter layer 220 and may have a first refractive index. The second organic insulating layer OC2 may be disposed on the first organic insulating layer OC1 and may have a second refractive index. For example, the second refractive index may be greater than the first refractive index.

[0136] The second organic insulating layer OC2 may have a refractive index greater than that of the first organic insulating layer OC1, and thus light emitted from the light emitting device ED may be refracted or reflected by an interface between the second organic insulating layer OC2 and the first organic insulating layer OC1, thereby changing the optical path. The light extraction efficiency of the display panel 110 according to the embodiment of the present disclosure may be improved by changing the optical path.

[0137] In addition, the first organic insulating layer OC1 and the second organic insulating layer OC2 may each include an inclined surface in a region between the sub-pixels SP1 to SP3 .

[0138] In detail, the first organic insulating layer OC1 may include a first flat surface S11 formed in a region overlapping each of the sub-pixels SP1 to SP3 and a first concave portion CV1 concavely formed in a region between the sub-pixels SP1 to SP3 to face the first substrate 111. Figure 7 As shown, the first concave portion CV1 of the first organic insulating layer OC1 may include an opening area OA that exposes at least a portion of each of the color filters CF1 and CF2. In this case, the first concave portion CV1 of the first organic insulating layer OC1 may include a first inclined surface S12 formed on at least one side of the opening area OA. The first inclined surface S12 may have a high first slope θ1. In an embodiment, the first slope θ1 may be 70 degrees or more.

[0139] The first inclined surface S12 may have a high first slope θ1, and thus, the first organic insulating layer OC1 may have a relatively thick first thickness T1. The first organic insulating layer OC1 may include an organic material. The thickness and flatness of the organic material may vary based on viscosity. The first organic insulating layer OC1 may include an organic material having a high first viscosity. For example, the first organic insulating layer OC1 may include photo propylene (PAC). Compared to the second organic insulating layer OC2, the first organic insulating layer OC1 may have a thicker first thickness T1, and the surface of the first organic insulating layer OC1 may be uniformly flattened.

[0140] In the display panel 110 according to another embodiment of the present disclosure, the first inclined surface S12 of the first organic insulating layer OC1 may have a high first slope θ1, and thus, a separation distance between the sub-pixels SP1 to SP3 may be reduced.

[0141] The second organic insulating layer OC2 may include a first flat surface S21 formed in a region overlapping each of the sub-pixels SP1 to SP3 and a second concave portion CV2 concavely formed in a region between the sub-pixels SP1 to SP3 to face the first substrate 111. At least a portion of the second concave portion CV2 of the second organic insulating layer OC2 may overlap the first concave portion CV1 of the first organic insulating layer OC1.

[0142] like Figure 7 As shown, the second concave portion CV2 of the second organic insulating layer OC2 may be formed to cover the color filters CF1 and CF2 exposed by the opening area OA of the first organic insulating layer OC1. In this case, the second concave portion CV2 of the second organic insulating layer OC2 may include a second flat surface S23 and a second inclined surface S22, each of which is disposed at a height lower than the first flat surface S21. The second inclined surface S22 may be disposed on at least one side of the second flat surface S23, and may be a surface connecting the first flat surface S21 to the second flat surface S23. At least a portion of the second inclined surface S22 may overlap with the first inclined surface S12 of the first organic insulating layer OC1. Figure 7 , it is shown that the second flat surface S23 is formed at the second concave portion CV2, but the embodiments of the present disclosure are not limited thereto. In the second concave portion CV2 of the second organic insulating layer OC2, the second flat surface S23 may be omitted based on the separation distance between the sub-pixels SP1 to SP3 or the viscosity of the organic material of the second organic insulating layer OC2. Alternatively, in the second concave portion CV2 of the second organic insulating layer OC2, the second flat surface S23 may not be a flat surface.

[0143] The second inclined surface S22 of the second organic insulating layer OC2 may have a second slope θ2 lower than the first inclined surface S12 of the first organic insulating layer OC1. In an embodiment, the second slope θ2 may be 45 degrees or less.

[0144] The second inclined surface S22 may have a lower second slope θ2, and therefore, the second organic insulating layer OC2 may have a relatively thin second thickness T2. When the second thickness T2 of the second organic insulating layer OC2 is thick, the horizontal distance of the second inclined surface S22 of the second organic insulating layer OC2 may increase so that the second slope θ2 is formed to be 45 degrees or less. As the horizontal distance of the second inclined surface S22 of the second organic insulating layer OC2 increases, the separation distance between the sub-pixels SP1 to SP3 may increase. Therefore, the aperture ratio of the display panel 110 may be reduced. In the display panel 110 according to another embodiment of the present disclosure, the second thickness T2 of the second organic insulating layer OC2 may be formed to be thin, and therefore, the second slope θ2 of the second inclined surface S22 of the second organic insulating layer OC2 may be formed to be 45 degrees or less, and the separation distance between the sub-pixels SP1 to SP3 may not increase.

[0145] The second organic insulating layer OC2 may include an organic material. The thickness and planarization characteristics of the organic material may vary based on viscosity. The second organic insulating layer OC2 may include an organic material having a low second viscosity. For example, the second organic insulating layer OC2 may include polyimide (PI) or a siloxane-based organic material. The second organic insulating layer OC2 may have a second thickness T2 that is thinner than the first organic insulating layer OC1, and may allow planarization not to be achieved in the second concave portion CV2. Therefore, the second organic insulating layer OC2 may fully ensure the area of ​​the second inclined surface S22 in the second concave portion CV2. The first organic insulating layer OC1 may include an organic material having a viscosity higher than that of the second organic insulating layer OC2.

[0146] In addition, Figure 7 In the illustrated second organic insulating layer OC2 , a third thickness T3 at the third flat surface S23 or at a point where second inclined surfaces S22 disposed to face each other contact each other may be smaller than a second thickness T2 at the first flat surface S21 .

[0147] In detail, Figure 5In the second organic insulating layer OC2 according to the embodiment of the present disclosure shown, the first flat surface S21, the second inclined surface S22, and the third flat surface S23 may be formed simultaneously. In the second organic insulating layer OC2, the second thickness T2 at the first flat surface S21 may be the same as the third thickness T3 at the third flat surface S23 or at the point where the second inclined surfaces S22 disposed to face each other contact each other, or the difference therebetween may occur within a small range.

[0148] On the other hand, Figure 7 In the second organic insulating layer OC2 according to another embodiment of the present disclosure, the first flat surface S21, the second inclined surface S22, and the third flat surface S23 may not be formed at the same time. First, the second organic insulating layer OC2 having a second thickness T2 may be formed on the first flat surface S11 and the first inclined surface S12 of the first organic insulating layer OC1. Then, as shown in FIG. Figure 8 As shown, a photoresist pattern PR may be formed on a first flat surface S21 of the second organic insulating layer OC2, and an ashing process may be performed by using a gas such as NF3 or O2. A portion of the second organic insulating layer OC2 may be removed in an area not covered by the photoresist pattern PR (i.e., an area between sub-pixels SP1 to SP3) based on the ashing process, and thus, the thickness of the second organic insulating layer OC2 may be reduced, thereby forming a second inclined surface S22 and a third flat surface S23. Therefore, in the second organic insulating layer OC2, a third thickness T3 at the third flat surface S23 or at a point where the second inclined surfaces S22 disposed to face each other contact each other may be smaller than a second thickness T2 at the first flat surface S21. In this case, the third thickness T3 at the third flat surface S23 or at a point where the second inclined surfaces S22 disposed to face each other contact each other may have a minimum thickness that enables the color filters CF1 and CF2 to be covered.

[0149] In the display panel 110 according to another embodiment of the present disclosure, the second concave portion CV2 of the second organic insulating layer OC2 may have a maximum depth (or vertical distance) through an ashing process, and thus the second inclined surface S22 of the second concave portion CV2 may have a maximum area. Therefore, in the display panel 110 according to another embodiment of the present disclosure, the inclined surface ES of the second electrode E2 may have a maximum area, and light extraction efficiency may be maximized.

[0150] The second organic insulating layer OC2 (or second concave portion CV2) may be formed to cover the color filters CF1 and CF2 exposed by the opening area OA of the first organic insulating layer OC1. Therefore, the second organic insulating layer OC2 may prevent gas degassed from the color filters CF1 and CF2 from moving to the light emitting device ED.

[0151] Fig. 9 is shown along Figure 3 FIG. 4 is a cross-sectional view of another embodiment of a sub-pixel taken along line II′ shown in FIG.

[0152] Apart from Fig. 9 The display panel 110 shown further includes a bank portion BN. Fig. 9 The other elements of the display panel 110 shown may be Figure 5 The display panels 110 shown are substantially the same, and thus a detailed description thereof is omitted.

[0153] refer to Fig. 9 According to another embodiment of the present disclosure, a display panel 110 may include a first substrate 111 and a second substrate 112 facing each other, and a circuit element layer 210, a color filter layer 220, an organic insulating layer 230, a light emitting device layer 240 and an encapsulation layer 250, all of which are arranged between the first substrate 111 and the second substrate 112.

[0154] The light emitting device layer 240 may be disposed on the organic insulating layer 230. The light emitting device layer 240 may include a bank BN and light emitting devices ED respectively included in the sub-pixels SP1 to SP3. Each of the light emitting devices ED may include a first electrode E1, an emission layer EL, and a second electrode E2.

[0155] The bank BN may cover the edge of the first electrode E1 included in each of the sub-pixels SP1 to SP3. The bank BN may not overlap with the first concave portion CV1 of the first organic insulating layer OC1 and the second concave portion CV2 of the second organic insulating layer OC2. The bank BN may also not be connected to each other in the region between the sub-pixels SP1 to SP3. For example, the bank BN formed to cover the edge of the first electrode E1 of the first sub-pixel SP1 may be spaced apart from the bank BN formed to cover the edge of the first electrode E1 of the second sub-pixel SP2, with the first concave portion CV1 of the first organic insulating layer OC1 and the second concave portion CV2 of the second organic insulating layer OC2 therebetween. The bank BN may include an opening portion through which the first electrode E1 is exposed, and the first emission area EA1 and the second emission area EA2 may be defined. The region provided with the bank BN may be included in the non-emission area NEA.

[0156] The emission layer EL of the light emitting device ED may be continuously formed between the sub-pixels SP1 to SP3 and the sub-pixels SP1 to SP3. In each of the sub-pixels SP1 to SP3, the emission layer EL may be formed on the first electrode E1 exposed by the opening portion of the bank BN. In addition, between the sub-pixels SP1 to SP3, the emission layer EL may be formed on the second concave portion CV2 of the bank BN and the second organic insulating layer OC2. In this case, the emission layer EL may be formed along one side of the bank BN and the second inclined surface S22 of the second organic insulating layer OC2, and a third inclined surface ELS may be formed in the emission layer EL.

[0157] In addition to the sub-pixels SP1 to SP3, the second electrode E2 of the light-emitting device ED may be formed in the region between the sub-pixels SP1 to SP3. The second electrode E2 may be continuously formed in the sub-pixels SP1 to SP3 and between the sub-pixels SP1 to SP3. In each of the sub-pixels SP1 to SP3, the second electrode E2 may be formed on the first electrode E1 exposed by the opening portion of the bank BN. In addition, between the sub-pixels SP1 to SP3, the second electrode E2 may be formed on the bank BN and the second concave portion CV2 of the second organic insulating layer OC2. In this case, the second electrode E2 may be formed along one side of the bank BN and the second inclined surface S22 of the second organic insulating layer OC2, and the fourth inclined surface ES may be formed in the second electrode E2.

[0158] In the display panel 110 according to another embodiment of the present disclosure, the second electrode E2 may be formed along one side of the bank BN and the second inclined surface S22 of the second organic insulating layer OC2, and thus the area of ​​the fourth inclined surface ES may be increased. In the display panel 110 according to another embodiment of the present disclosure, the area of ​​the fourth inclined surface ES of the second electrode E2 may be increased, and thus the area into which light can be incident may be increased, thereby improving light extraction efficiency.

[0159] Fig.10 is shown along Figure 3 A cross-sectional view of another embodiment of a sub-pixel taken along line II′ is shown.

[0160] Except for the organic insulating layer OC, Fig.10 The other elements of the display panel 110 shown in FIG. Figure 5 The display panels 110 shown in FIGS. 1 and 10 are substantially the same, and thus their detailed descriptions are omitted.

[0161] refer to Fig.10According to another embodiment of the present disclosure, a display panel 110 may include a first substrate 111 and a second substrate 112 facing each other, and a circuit element layer 210, a color filter layer 220, an organic insulating layer 230, a light emitting device layer 240 and an encapsulation layer 250, all of which are arranged between the first substrate 111 and the second substrate 112.

[0162] The organic insulating layer 230 may be disposed on the color filter layer 220. The organic insulating layer 230 may include two organic insulating layers having different refractive indices in order to improve extraction efficiency of light emitted from the light emitting device ED. The organic insulating layer 230 may include a first organic insulating layer OC1 and a second organic insulating layer OC2.

[0163] The first organic insulating layer OC1 may be disposed on the color filter layer 220 and may have a first refractive index. The second organic insulating layer OC2 may be disposed on the first organic insulating layer OC1 and may have a second refractive index. For example, the second refractive index may be greater than the first refractive index.

[0164] The second organic insulating layer OC2 may have a refractive index greater than that of the first organic insulating layer OC1, and thus light emitted from the light emitting device ED may be refracted or reflected by an interface between the second organic insulating layer OC2 and the first organic insulating layer OC1, thereby changing the optical path. The light extraction efficiency of the display panel 110 according to another embodiment of the present disclosure may be improved by changing the optical path.

[0165] In addition, the first organic insulating layer OC1 and the second organic insulating layer OC2 may each include an inclined surface in a region between the sub-pixels SP1 to SP3 .

[0166] In detail, the first organic insulating layer OC1 may include a first flat surface S11 formed in a region overlapping each of the sub-pixels SP1 to SP3 and a first concave portion CV1 concavely formed in a region between the sub-pixels SP1 to SP3 to face the first substrate 111. Fig.10 As shown, the first concave portion CV1 of the first organic insulating layer OC1 may be formed to cover the color filters CF1 and CF2. The first concave portion CV1 of the first organic insulating layer OC1 may include a second flat surface S13 and a second inclined surface S12, each of which is disposed at a height lower than the first flat surface S11. The first inclined surface S12 may be disposed at least on one side of the second flat surface S13, and may be a surface connecting the first flat surface S11 to the second flat surface S13. Fig.10, it is shown that the second flat surface S13 is formed at the first concave portion CV1, but the embodiments of the present disclosure are not limited thereto. In the first concave portion CV1 of the first organic insulating layer OC1, the second flat surface S13 may be omitted based on the separation distance between the sub-pixels SP1 to SP3 or the viscosity of the organic material of the first organic insulating layer OC1. Alternatively, in the first concave portion CV1 of the first organic insulating layer OC1, the second flat surface S13 may not be a flat surface.

[0167] The first inclined surface S12 may have a high first slope θ1. In an embodiment, the first slope θ1 may be 70 degrees or more.

[0168] The first inclined surface S12 may have a high first slope θ1, and thus, the first organic insulating layer OC1 may have a relatively thick first thickness T1. The first organic insulating layer OC1 may include an organic material. The thickness and flatness of the organic material may vary based on viscosity. The first organic insulating layer OC1 may include an organic material having a high first viscosity. For example, the first organic insulating layer OC1 may include photo propylene (PAC). Compared to the second organic insulating layer OC2, the first organic insulating layer OC1 may have a thicker first thickness T1, and the surface of the first organic insulating layer OC1 may be uniformly flattened.

[0169] In the display panel 110 according to another embodiment of the present disclosure, the first inclined surface S12 of the first organic insulating layer OC1 may have a high first slope θ1, and thus, a separation distance between the sub-pixels SP1 to SP3 may be reduced.

[0170] The second organic insulating layer OC2 may include a first flat surface S21 formed in a region overlapping each of the sub-pixels SP1 to SP3 and a second concave portion CV2 concavely formed in a region between the sub-pixels SP1 to SP3 to face the first substrate 111 .

[0171] like Fig.10 As shown, at least a portion of the second concave portion CV2 of the second organic insulating layer OC2 may overlap with the first concave portion CV1 of the first organic insulating layer OC1. The second concave portion CV2 of the second organic insulating layer OC2 may include a second flat surface S23 and a second inclined surface S22, each of which is disposed at a height lower than the first flat surface S21. The second inclined surface S22 may be disposed on at least one side of the second flat surface S23, and may be a surface connecting the first flat surface S21 to the second flat surface S23. At least a portion of the second inclined surface S22 may overlap with the first inclined surface S12 of the first organic insulating layer OC1. Fig.10, it is shown that the second flat surface S23 is formed at the second concave portion CV2, but the embodiments of the present disclosure are not limited thereto. In the second concave portion CV2 of the second organic insulating layer OC2, the second flat surface S23 may be omitted based on the separation distance between the sub-pixels SP1 to SP3 or the viscosity of the organic material of the second organic insulating layer OC2. Alternatively, in the second concave portion CV2 of the second organic insulating layer OC2, the second flat surface S23 may not be a flat surface.

[0172] The second inclined surface S22 of the second organic insulating layer OC2 may have a second slope θ2 lower than the first inclined surface S12 of the first organic insulating layer OC1. In an embodiment, the second slope θ2 may be 45 degrees or less.

[0173] The second inclined surface S22 may have a lower second slope θ2, and therefore, the second organic insulating layer OC2 may have a relatively thin second thickness T2. When the second thickness T2 of the second organic insulating layer OC2 is thick, the horizontal distance of the second inclined surface S22 of the second organic insulating layer OC2 may increase, so that the second slope θ2 is formed to be 45 degrees or less. As the horizontal distance of the second inclined surface S22 of the second organic insulating layer OC2 increases, the separation distance between the sub-pixels SP1 to SP3 may increase. Therefore, the aperture ratio of the display panel 110 may be reduced. In the display panel 110 according to another embodiment of the present disclosure, the second thickness T2 of the second organic insulating layer OC2 may be formed to be thin, and therefore, the second slope θ2 of the second inclined surface S22 of the second organic insulating layer OC2 may be formed to be 45 degrees or less, and the separation distance between the sub-pixels SP1 to SP3 may not increase.

[0174] The second organic insulating layer OC2 may include an organic material. The thickness and planarization characteristics of the organic material may vary based on viscosity. The second organic insulating layer OC2 may include an organic material having a low second viscosity. For example, the second organic insulating layer OC2 may include polyimide (PI) or a siloxane-based organic material. The second organic insulating layer OC2 may have a second thickness T2 that is thinner than the first organic insulating layer OC1, and planarization may not be achieved in the second concave portion CV2. Therefore, the second organic insulating layer OC2 may sufficiently ensure the area of ​​the second inclined surface S22 in the second concave portion CV2.

[0175] In the display panel 110 according to another embodiment of the present disclosure, the first organic insulating layer OC1 having good planarization characteristics may be formed to cover the color filters CF1 and CF2. Therefore, the second organic insulating layer OC2 having relatively poor planarization characteristics may not completely cover the color filters CF1 and CF2, thereby preventing the gas caused by degassing from moving to the light emitting device ED.

[0176] The above-mentioned features, structures and effects of the present disclosure are included in at least one embodiment of the present disclosure, but are not limited to only one embodiment. In addition, the features, structures and effects described in at least one embodiment of the present disclosure can be implemented by those skilled in the art by combining or modifying other embodiments. Therefore, the contents associated with the combination and modification should be interpreted as being within the scope of the present disclosure.

[0177] It is obvious to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure as long as they fall within the scope of the appended claims and their equivalents.

Claims

1. A display panel, comprising: A first sub-pixel and a second sub-pixel are disposed on a substrate, the first sub-pixel is adjacent to the second sub-pixel, and each of the first sub-pixel and the second sub-pixel includes a first electrode, an emission layer, and a second electrode; a first insulating layer disposed between the emission layer and the substrate, the first insulating layer comprising a first concave portion disposed between a first emission region of the first sub-pixel and a second emission region of the second sub-pixel; and a second insulating layer disposed between the emission layer and the first insulating layer, the second insulating layer including a second concave portion disposed between the first emission region and the second emission region, wherein the second electrode extends across the second concave portion of the second insulating layer, wherein a portion of the second electrode is disposed in the second concave portion, and wherein the portion of the second electrode is located closer to the substrate than both the first electrode in the first sub-pixel and the first electrode in the second sub-pixel, or is located closer to the substrate than an upper surface of the first insulating layer, where the upper surface is a surface of the first insulating layer on a side away from the substrate.

2. The display panel according to claim 1, further comprising: a color filter layer disposed in at least one of the first sub-pixel and the second sub-pixel, The first insulating layer includes an opening area exposing at least a portion of the color filter layer.

3. The display panel according to claim 1, wherein: The portion of the second electrode is configured to reflect light emitted from at least one of the first emission region and the second emission region in a direction toward the substrate.

4. The display panel according to claim 1, wherein: The second insulating layer has a second refractive index greater than a first refractive index of the first insulating layer.

5. The display panel according to claim 1, wherein: A first thickness of the first insulating layer in a region overlapping the first emission region or the second emission region is greater than a second thickness of the second insulating layer in a region overlapping the first emission region or the second emission region.

6. The display panel according to claim 5, wherein: the second insulating layer has a third thickness corresponding to a center of the second concave portion, and Wherein, the third thickness is less than or equal to the second thickness.

7. The display panel according to claim 1, wherein: the first insulating layer includes a first inclined surface corresponding to the first concave portion, wherein the second insulating layer includes a second inclined surface corresponding to the second concave portion, and Wherein, the first inclined surface is steeper than the second inclined surface.

8. The display panel according to claim 7, wherein: the emissive layer extends across both the first sub-pixel and the second sub-pixel, wherein the emission layer includes a third inclined surface corresponding to the second inclined surface of the second insulating layer, wherein the second electrode comprises a fourth inclined surface corresponding to the third inclined surface of the emission layer, and The angle of the fourth inclined surface of the second electrode corresponds to the angle of the second inclined surface of the second insulating layer.

9. The display panel according to claim 1, wherein: A lowermost portion of the second electrode between the first sub-pixel and the second sub-pixel is closer to the substrate than an upper surface of the first insulating layer.

10. The display panel according to claim 1, wherein: The first insulating layer includes open areas corresponding to the first concave portions, the open areas being holes extending through opposite sides of the first insulating layer.

11. The display panel according to claim 1, further comprising: A bank is provided on an edge of the first electrode in the first sub-pixel and on an edge of the first electrode in the second sub-pixel.

12. The display panel according to claim 1, wherein: The first insulating layer and the second insulating layer both extend continuously across a non-emitting region between the first sub-pixel and the second sub-pixel, and The first insulating layer includes a first flat surface overlapping at least one of the first emission area and the second emission area, and a second flat surface overlapping the non-emission area between the first sub-pixel and the second sub-pixel, and the second flat surface is arranged to be closer to the substrate than the first flat surface.

13. The display panel according to claim 1, wherein: In a non-emission region between the first sub-pixel and the second sub-pixel, a cross-section of the second electrode has a “V” shape or a “U” shape.

14. The display panel according to claim 1, wherein: the emissive layer extends across both the first sub-pixel and the second sub-pixel, wherein an outer edge of the first electrode in the first subpixel facing the first concave portion and the second concave portion directly contacts the emission layer, and The outer edge of the first electrode in the second sub-pixel facing the first concave portion and the second concave portion directly contacts the emission layer.

15. The display panel according to claim 1, wherein: The first inclined surface of the first insulating layer has a slope greater than or equal to 70 degrees, and The second inclined surface of the second organic insulating layer has a slope less than or equal to 45 degrees.

16. A display device, comprising: A first organic insulating layer disposed on the substrate, the first organic insulating layer comprising a first inclined surface located between the first sub-pixel and the second sub-pixel; a second organic insulating layer disposed on the first organic insulating layer, the second organic insulating layer comprising a second inclined surface located between the first sub-pixel and the second sub-pixel and at least partially overlapping the first inclined surface; and a plurality of light emitting devices, which are respectively arranged in the first sub-pixel and the second sub-pixel and are located on the second organic insulating layer; The second inclined surface of the second organic insulating layer has a slope smaller than a slope of the first inclined surface of the first organic insulating layer.

17. The display device according to claim 16, wherein: The first organic insulating layer is thicker than the second organic insulating layer.

18. The display device according to claim 16, wherein: The first organic insulating layer has a lower refractive index than the second organic insulating layer.

19. The display device according to claim 16, wherein: The first inclined surface of the first organic insulating layer has a slope greater than or equal to 70 degrees.

20. The display device according to claim 16, wherein: The second inclined surface of the second organic insulating layer has a slope less than or equal to 45 degrees.

21. The display device according to claim 16, wherein: The first organic insulating layer includes an organic material having a viscosity higher than a viscosity of the second organic insulating layer.

22. The display device according to claim 16, wherein: The first organic insulating layer includes an opening region between the first sub-pixel and the second sub-pixel, and The second organic insulating layer covers the opening area of ​​the first organic insulating layer.

23. The display device according to claim 16, wherein: A thickness of the second organic insulating layer between the first sub-pixel and the second sub-pixel is thinner than a thickness of the second organic insulating layer in a region overlapping the first sub-pixel.

24. The display device according to claim 16, wherein: The first organic insulating layer further includes a first flat surface in a region overlapping the first sub-pixel, and a second flat surface disposed at a height lower than the first flat surface in a region between the first sub-pixel and the second sub-pixel, and Wherein, the first inclined surface connects the first flat surface to the second flat surface. 25 . The display device of claim 16 , further comprising a plurality of color filters disposed in the first sub-pixel and the second sub-pixel, respectively, between the substrate and the first organic insulating layer.

26. The display device according to claim 25, wherein: The first organic insulating layer includes an opening area between the first sub-pixel and the second sub-pixel, the opening area exposing at least a portion of each of the plurality of color filters, and The second organic insulating layer covers at least a portion of each of the plurality of color filters between the first sub-pixel and the second sub-pixel that is exposed by the opening region.

27. The display device according to claim 25, wherein: The plurality of color filters at least partially overlap each other between the first sub-pixel and the second sub-pixel.

28. The display device according to claim 16, wherein: Each of the plurality of light emitting devices comprises: a first electrode on the second organic insulating layer; an emitting layer on the first electrode; and a second electrode on the emitting layer, Wherein, the second electrode is a reflective electrode.

29. The display device according to claim 28, wherein: The emission layer continuously extends across and between the first sub-pixel and the second sub-pixel, and the emission layer contacts an entire area of ​​the first electrode.

30. The display device according to claim 28, wherein: The second electrode continuously extends across and between the first sub-pixel and the second sub-pixel, and the second electrode extends along the second inclined surface of the second organic insulating layer between the first sub-pixel and the second sub-pixel. 31 . The display device according to claim 28 , further comprising a bank provided on the first electrode to cover an end portion of the first electrode.

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