Display device

Abstract

To provide a display device capable of improving an opening ratio and optical extraction efficiency, preventing a light leakage failure, and having high light emission efficiency.SOLUTION: A display panel includes: a first insulation layer OC1 which is arranged between a first sub pixel, a second sub pixel, a light emission layer EL, and the substrate 111, and includes a first concave part CV1 which is arranged between the first light emission region EA1 of the first sub pixel and the second light emission region EA2 of the second sub pixel; and a second insulation layer OC2 that is arranged between the light emission layer EL and the first insulation layer OC1, and a second concave part CV2 that is overlapped with the first concave part OC1. the first and second insulation layers being arranged adjacently on the substrate 111. A second electrode E2 is extended so as to cross the second concave part CV2 of the second insulation layer OC2, and one part of the second electrode E2 is arranged to the second concave part CV2. One part of the second electrode E2 is positioned near the substrate 111 from the first electrode E1 of the first sub pixel and the first electrode E1 of the second sub pixel, or is positioned near the substrate 111 from the upper surface of the first insulation layer OC1.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] This specification relates to a display device having a bottom emission structure.

Background Art

[0002] Display devices can be broadly classified into a bottom emission structure and a top emission structure depending on the direction in which the emitted light is emitted. In a display device having a bottom emission structure, the emitted light is radiated downward, and in a display device having a top emission structure, the emitted light is emitted upward.

[0003] Regarding a display device having a bottom emission structure, research has been conducted to improve the light extraction efficiency by using a structure including a plurality of layers provided under a light emitting element.

[0004] However, in order to increase the light extraction efficiency, it is often necessary to include a plurality of layers and additional components, which increases the thickness of the display device, increases the distance and space between sub-pixels, impairs the resolution, and may increase the cost and production time by using additional manufacturing processes. Also, light leakage may occur between adjacent sub-pixels, deteriorating the image quality, and outgas generated in the lower layer may reach the light emitting element, shortening the life of the display device.

[0005] Therefore, there is a need for a display device having a bottom emission structure that can improve light extraction, reduce the thickness of the display device, reduce power consumption, package sub-pixels closer together for higher resolution, better prevent outgas from reaching the light emitting element, and reduce the number of manufacturing processes to save time and cost.

Summary of the Invention

Problems to be Solved by the Invention

[0006] A technical problem of the present invention is to provide a display device capable of improving the aperture ratio and light extraction efficiency.

[0007] Another technical problem of the present invention is to provide a display device capable of preventing light leakage defects.

[0008] Another technical problem of the present invention is also to provide a display device that can have high luminous efficiency even at low power.

Means for Solving the Problems

[0009] An object of the present invention is to provide a display panel including a first sub-pixel and a second sub-pixel arranged adjacent to each other on a first substrate, each including a first electrode, a light-emitting layer, and a second electrode, a first color filter disposed between a first light-emitting region of the first sub-pixel and the first substrate, a second color filter disposed between a second light-emitting region of the second sub-pixel and the first substrate, and an insulating layer disposed between the first and second light-emitting regions and the first and second color filters. Further, a concave portion of the insulating layer is disposed between the first and second light-emitting regions, the second electrode extends across the concave portion, a part of the second electrode is disposed in the concave portion, and it is for providing a display panel disposed closer to the first substrate than the lower surface of the first electrode.

[0010] Another object of the present invention is located on a first substrate, adjacent to each other, a first sub-pixel and a second sub-pixel each including a first electrode, a light-emitting layer, and a second electrode, a first color filter disposed between a first light-emitting region of the first sub-pixel and the first substrate, a second color filter disposed between a second light-emitting region of the second sub-pixel and the first substrate, a first insulating layer disposed between the first and second light-emitting regions and the first and second color filters, a first concave portion of the first insulating layer disposed between the first and second light-emitting regions, a second insulating layer disposed between the first and second light-emitting regions and the first insulating layer, and a second concave portion of the second insulating layer disposed between the first and second sub-pixels and overlapping the first concave portion, the second electrode extends across the second concave portion of the second insulating layer, a part of the second electrode is disposed in the second concave portion, and a part of the second electrode is located closer to the first substrate than the first electrode of the first sub-pixel and the first electrode of the second sub-pixel, or is disposed at a position closer to the first substrate than the upper surface of the first insulating layer, and it is for providing a display panel.

[0011] An object of the present invention is to provide a display panel including a first sub-pixel and a second sub-pixel that are arranged adjacent to each other on a substrate and each include a first electrode, a light-emitting layer, and a second electrode, an insulating layer disposed between the light-emitting layer and the substrate, the insulating layer including a first recess disposed between a first light-emitting region of the first sub-pixel and a second light-emitting region of the second sub-pixel, and a second insulating layer disposed between the light-emitting layer and the first insulating layer, the second insulating layer including a second recess disposed between the first light-emitting region and the second light-emitting region, wherein the second electrode extends across the second recess of the second insulating layer, a part of the second electrode is disposed in the second recess, and a part of the second electrode is located closer to the substrate than the first electrode of the first sub-pixel and the first electrode of the second sub-pixel, or is located closer to the substrate than the upper surface of the first insulating layer.

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

[0013] An object of the present invention is to provide a display panel configured such that a part of the second electrode reflects light emitted from at least one of the first light-emitting region and the second light-emitting region in a direction toward the substrate.

[0014] Another object of the present invention is to provide a display panel in which the second insulating layer has a second refractive index greater than a first refractive index of the first insulating layer.

[0015] Another object of the present invention is to provide a display panel in which a first thickness of the first insulating layer in a region overlapping with the first light-emitting region or the second light-emitting region is greater than a second thickness of the second insulating layer in a region overlapping with the first light-emitting region or the second light-emitting region.

[0016] An object of the present invention is to provide a display panel in which the second insulating layer has a third thickness corresponding to the center of the second recess, and the third thickness is less than or equal to the second thickness.

[0017] Another object of the present invention is to provide a display panel in which 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] An object of the present invention is that the light-emitting layer extends across both the first and second sub-pixels, the light-emitting layer includes a third inclined surface corresponding to the second inclined surface of the second insulating layer, the second electrode includes a fourth inclined surface corresponding to the third inclined surface of the light-emitting 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 to provide a display panel.

[0019] Another object of the present invention is to provide a display panel in which the lowermost portion of the second electrode between the first sub-pixel and the second sub-pixel is disposed closer to the substrate than the upper surface of the first insulating layer.

[0020] An object of the present invention is to provide a display panel in which the first insulating layer includes an opening region corresponding to the first concave portion, and the opening region is a hole penetrating both opposite side surfaces of the first insulating layer.

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

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

[0023] An object of the present invention 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-light-emitting region between the first sub-pixel and the second sub-pixel.

[0024] Another object of the present invention is to provide a display panel in which a light-emitting layer extends across both the first and second sub-pixels, and an outer edge of the first electrode facing the first recess and the second recess in the first sub-pixel is in direct contact with the light-emitting layer, and an outer edge of the first electrode facing the first recess and the second recess in the second sub-pixel is in direct contact with the light-emitting layer.

[0025] An object of the present invention is to provide a display panel in which a first inclined surface of the first insulating layer has an inclination of 70 degrees or more, and a second inclined surface of the second organic insulating layer has an inclination of 45 degrees or less.

[0026] Another object of the present invention is to provide a display device including a first organic insulating layer disposed on a substrate and including a first inclined surface between a first sub-pixel and a second sub-pixel, a second organic insulating layer disposed on the first organic insulating layer and including a second inclined surface between the first sub-pixel and the second sub-pixel, at least a part of the second inclined surface overlapping with the first inclined surface, a plurality of light-emitting elements respectively disposed on the second organic insulating layer for the first sub-pixel and the second sub-pixel, and the second inclined surface of the second organic insulating layer having an inclination smaller than an inclination of the first inclined surface of the first organic insulating layer.

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

[0028] Another object of the present invention is to provide a display device in which the first organic insulating layer has a lower refractive index than the second organic insulating layer.

[0029] An object of the present invention is to provide a display device in which a first inclined surface of the first organic insulating layer has an inclination of 70 degrees or more.

[0030] Another object of the present invention is to provide a display device in which the second inclined surface of the second organic insulating layer has an inclination of 45 degrees or less.

[0031] Another object of the present invention is to provide a display device in which the first organic insulating layer contains an organic substance having a higher viscosity than the viscosity of the second organic insulating layer.

[0032] An object of the present invention is to provide a display device in which 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 region of the first organic insulating layer.

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

[0034] An object of the present invention is to further include a first flat surface in a region where the first organic insulating layer overlaps with 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 the first inclined surface connects the first flat surface to the second flat surface.

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

[0036] An object of the present invention is to provide a display device in which the first organic insulating layer includes an opening region that exposes at least a part of each of the plurality of color filters between the first sub-pixel and the second sub-pixel, and the second organic insulating layer covers at least a part of each of the plurality of color filters exposed by the opening region between the first sub-pixel and the second sub-pixel.

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

[0038] Another object of the present invention is to provide a display device in which each of the plurality of light-emitting elements includes a first electrode on the second organic insulating layer, a light-emitting layer on the first electrode, and a second electrode on the light-emitting layer, and the second electrode is a reflective electrode.

[0039] An object of the present invention is to provide a display device in which the light-emitting layer extends continuously between the first sub-pixel and the second sub-pixel across the first sub-pixel and the second sub-pixel, and the light-emitting layer contacts the entire region of the first electrode.

[0040] An object of the present invention is to provide a display device in which the second electrode extends continuously between the first sub-pixel and the second sub-pixel across 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.

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

Advantages of the Invention

[0042] This specification can improve the light extraction efficiency by reflecting the light emitted from the light-emitting element and moving to the side surface on the inclined surface of the second electrode to change the light path in the front direction.

[0043] This specification can reduce the area of the non-light-emitting region and improve the aperture ratio.

[0044] In addition, this specification can have high luminous efficiency even at low power, and further can reduce power consumption.

[0045] This specification can prevent moisture or oxygen from penetrating into the light-emitting element and causing deterioration.

[0046] In addition, this specification can prevent the light leakage phenomenon in which light emitted from the light-emitting element leaks into adjacent sub-pixels by reducing the total thickness of the first organic insulating layer and the second organic insulating layer.

[0047] The effects obtained by the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which this specification belongs from the following description.

Brief Description of the Drawings

[0048]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0049] The advantages and features of this specification, and the methods for achieving them, will become apparent by referring to the embodiments described in detail hereinafter together with the accompanying drawings. However, this specification is not limited to the embodiments disclosed below, but can be embodied in various different forms, and the embodiments are merely provided to make the disclosure of this specification complete and to fully inform those with ordinary knowledge in the technical field to which this specification pertains of the scope of the invention.

[0050] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the figures for explaining the embodiments of this specification are exemplary, and this specification is not limited to the matters shown in the figures. Throughout the specification, the same reference numerals refer to the same components. In addition, in the description of this specification, when it is determined that a specific description of related known technologies may unnecessarily obscure the gist of this specification, the detailed description thereof will be omitted. When terms such as "including", "having", "consisting of", etc. mentioned in this specification are used, other parts can be added unless "only" is used. When a component is expressed in the singular, it includes the case of including a plurality unless otherwise explicitly stated.

[0051] In interpreting components, it is interpreted to include an error range even without separate explicit description.

[0052] In the case of an explanation of the positional relationship, for example, when the positional relationship between two parts is explained by "on ~", "above ~", "below ~", "beside ~", etc., unless the expressions "immediately" or "directly" are used, one or more other parts can also be located between the two parts.

[0053] In the case of an explanation of the temporal relationship, for example, when the temporal sequence relationship is explained by "after ~", "subsequent to ~", "next ~", "before ~", etc., unless the expressions "immediately" or "directly" are used, it can also include the case of not being continuous.

[0054] The terms such as "first", "second", etc. are used to describe various components, but these components are not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical concept of this specification.

[0055] The term "at least one" should be understood to include all combinations of one or more of the related components. For example, the meaning of "at least one of the first item, the second item, and the third item" can mean not only each of the first item, the second item, or the third item alone, but also all combinations of two or more of the first item, the second item, and the third item listed.

[0056] The features of each of several embodiments of this specification can be partially or wholly combined or combined with each other, and various linkages and drives are technically possible. Each embodiment can be implemented independently of each other or can be implemented together in an associated relationship.

[0057] Hereinafter, a preferred example of the transparent display device according to the present invention will be described in detail with reference to the accompanying drawings. When adding reference signs to the components of each figure, for the same components, even if they are shown in different figures, they can have the same signs as much as possible. Also, in the description of the present invention, if it is determined that a specific description of a related known configuration or function obscures the gist of the present invention, the detailed description thereof can be omitted.

[0058] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0059] FIG. 1 is a perspective view showing a display device according to an embodiment of this specification, and FIG. 2 is a block diagram schematically showing the configuration of a display device according to an embodiment of the present invention. FIG. 3 is a plan view showing an example of a pixel provided in a display device according to an embodiment of the present invention.

[0060] The display device 100 according to the embodiments of this specification has been mainly described as being implemented as an Organic Light Emitting Display, but it can also be implemented as a Liquid Crystal Display, a Quantum dot Lighting Emitting Diode, or an Electrophoresis display.

[0061] Referring to FIGS. 1 and 2, the display device 100 according to an embodiment of this specification includes a display panel 110, a scan driver 120 (e.g., a gate driver) built into the display panel 110, a data driver 130 connected to the display panel 110, a timing controller 160 that controls the scan driver 120 and the data driver 130, and a power supply circuit 180.

[0062] The display panel 110 includes a first substrate 111 and a second substrate 112. The second substrate 112 can be a sealing substrate. The first substrate 111 can be made of a plastic film or a glass substrate, but is not necessarily limited thereto. The first substrate 111 can also be made of a semiconductor material such as a silicon wafer. The second substrate 112 can be a plastic film, a glass substrate, or a sealing film (protective film).

[0063] The display device 100 according to an embodiment of this specification can be of a bottom emission type in which the emitted light is emitted downward. In such a case, the material of the first substrate 111 can be a transparent material, and the material of the second substrate 112 can be not only a transparent material but also an opaque material.

[0064] The display panel 110 includes a display area (DA) and a non-display area (NDA) that surrounds the display area (DA) and is located in the outer peripheral portion. In the display panel 110, pixels (P) are provided in the display area (DA) to display an image. The pixel (P) can include at least two or more sub-pixels (SP). As an example, as shown in FIG. 3, the pixel (P) can include a plurality of sub-pixels (SP1, SP2, SP3). The plurality of sub-pixels (SP1, SP2, SP3) can include a first sub-pixel (SP1) that emits red light, a second sub-pixel (SP2) that emits green light, and a third sub-pixel (SP3) that emits blue light, but is not necessarily limited thereto. The plurality of sub-pixels (SP1, SP2, SP3) can further include a fourth sub-pixel that emits white light. Also, the arrangement order of the sub-pixels (SP1, SP2, SP3) can be variously changed.

[0065] Data lines (D1 to Dn, where n is a positive integer of 2 or more) and scan lines (S1 to Sm, where m is a positive integer of 2 or more) that are connected to the sub-pixels (SP1, SP2, SP3) are formed in the display panel 110. The data lines (D1 to Dn) can be formed so as to intersect the scan lines (S1 to Sm). Each of the sub-pixels (SP1, SP2, SP3) of the display panel 110 can be connected to any one of the data lines (D1 to Dn) and any one of the scan lines (S1 to Sm). The data lines (D1 to Dn) can supply the data voltage supplied from the data driver 130 to each sub-pixel (SP1, SP2, SP3). The scan lines (S1 to Sm) can supply the scan signal supplied from the scan driver 120 to each sub-pixel (SP1, SP2, SP3).

[0066] Each of the sub-pixels (SP1, SP2, SP3) is turned on by a scan signal, and when the data voltage of the data line is supplied to the gate electrode of the driving transistor, the light-emitting element can emit light by the drain-source current of the driving transistor.

[0067] The scan driver 120 receives an input of a scan control signal (GCS) from the timing controller 160. The scan driver 120 supplies a scan signal or a light emission control signal to the scan lines (S1 to Sm) using the scan control signal (GCS).

[0068] The scan driver 120 can be formed in a GIP (gate driver in panel) method in a non-display area (NDA) outside one or both sides of the display area (DA). Alternatively, the scan driver 120 can be created on a driving chip, mounted on a flexible film, and attached to the non-display area (NDA) outside one or both sides of the display area (DA) in a TAB (tape automated bonding) method.

[0069] The data driver 130 receives an input of digital video data (DATA) and a data control signal (DCS) from the timing controller 160. The data driver 130 uses the data control signal (DCS) to convert the digital video data (DATA) into an analog positive / negative polarity data voltage and supplies it to the data lines (D1 to Dn).

[0070] The data driver 130 can include a plurality of data drive ICs 131 as shown in FIG. 1. Each of the plurality of data drive ICs 131 can be mounted on the circuit film 140 in a COF (chip on film), COP (chip on plastic), FPC (Flexible Printed Circuit), or FFC (Flexible Flat Cable) method. The circuit film 140 is attached onto pads provided in the non-display area (NDA) of the display panel 110 using an anisotropic conductive film, whereby the plurality of data drive ICs 131 can be connected to the pads.

[0071] As shown in FIG. 1, the circuit board 150 can be attached to the circuit film 140. A plurality of circuits embodied as drive chips can be mounted on the circuit board 150. For example, a timing controller 160 can be mounted on the circuit board 150. The circuit board 150 can be a printed circuit board or a flexible printed circuit board.

[0072] The timing controller 160 receives an input of digital video data (DATA) and a timing signal from a host system. The timing signal can include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, a dot clock, and the like. The vertical synchronization signal is a signal that defines one frame period. The horizontal synchronization signal is a signal that defines one horizontal period required to supply a data voltage to the pixels of one horizontal line of the display panel 110. The data enable signal is a signal that defines a period during which valid data is input. The dot clock is a signal that is repeated at a predetermined short period.

[0073] The timing controller 160 generates 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 outputs the scan control signal (GCS) to the scan driver 120 and outputs the digital video data (DATA) and the data control signal (DCS) to the data driver 130.

[0074] The power supply circuit 180 can generate and supply a plurality of driving voltages necessary for the operation of all circuit configurations of the display device 100 using the input voltage. The power supply circuit 180 can generate a first power supply voltage (EVDD), a second power supply voltage (EVSS), and an initialization voltage (Vref, reference voltage) and supply them to the display panel 110. The power supply circuit 180 can generate and supply various driving voltages necessary for the operation of the gate driver 120, the data driver 130, and the timing controller 160.

[0075] FIG. 4 is a circuit diagram showing an example of the sub-pixel shown in FIG. 3 according to an embodiment of the present invention.

[0076] Referring to FIGS. 3 and 4, each sub-pixel (SP1, SP2, SP3) can have a 2T (Transistor) 1C (Capacitor) structure including two transistors (DT, ST) and one capacitor (Cst), but is not necessarily limited thereto. Each sub-pixel (SP1, SP2, SP3) can further include a compensation circuit (CC), and in such a case, can have various structures such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, 7T2C.

[0077] Each of the transistors (DT, ST) of each sub-pixel (SP1, SP2, SP3) includes a gate electrode, a source electrode, and a drain electrode. Since the source electrode and the drain electrode are not fixed and can be changed depending on the direction of the voltage and current applied to the gate electrode, either one of the source electrode and the drain electrode can be represented by the first electrode, and the remaining one can be represented by the second electrode. The transistors (DT, ST) of each sub-pixel (SP1, SP2, SP3) can use at least one of a polysilicon semiconductor, an amorphous silicon semiconductor, and an oxide semiconductor. The transistors (DT, ST) can be P-type or N-type, and P-type and N-type can be used in combination.

[0078] The light-emitting element (ED) can include an anode electrode connected to the driving transistor (DT), a cathode electrode receiving the supply of the second power supply voltage (EVSS) from the second power supply line (PL2), and a light-emitting layer between the anode electrode and the cathode electrode. The anode electrode is an independent electrode for each light-emitting element, while the cathode electrode can be a common electrode shared by the entire light-emitting element. When a driving current is supplied from the driving transistor (DT) to the light-emitting element (ED), electrons from the cathode electrode are injected into the light-emitting layer, holes from the anode electrode are injected into the light-emitting layer, and fluorescence or phosphorescence substances are emitted by the recombination of electrons and holes in the light-emitting layer, thereby generating light with brightness proportional to the current value of the driving current.

[0079] In each sub-pixel (SP1, SP2, SP3), the driving transistor (DT) is connected between the anode electrode of the light-emitting element (ED) and the first power supply line (PL1) that supplies the driving voltage (EVDD). Here, the driving voltage (EVDD) is applied to the first electrode of the driving transistor (DT).

[0080] Such a driving transistor (DT) is a transistor that drives the light-emitting element (ED), is controlled by the voltage applied to the gate electrode, and supplies current to the light-emitting element (ED). Thereby, the light-emitting element (ED) is driven.

[0081] In each sub-pixel (SP1, SP2, SP3), the switching transistor (ST) is connected between the first node (N1) of the driving transistor (DT) and the data line (D). The switching transistor (ST) is controlled by the scan signal (Scan) supplied from the scan line (S), and applies the data voltage (Vdata) supplied from the data line (D) to the first node (N1).

[0082] In each sub-pixel (SP1, SP2, SP3), the capacitor (Cst) is connected to the first node (N1) and charges the voltage applied to the first node (N1). The capacitor (Cst) can supply the charged driving voltage to the driving transistor (DT). The capacitor (Cst) is a storage capacitor.

[0083] The compensation circuit (CC) can be provided to compensate for the threshold voltage etc. of the driving transistor (DT). The compensation circuit (CC) can be composed of one or more transistors. The compensation circuit (CC) can include one or more transistors and capacitors and can be configured in various ways depending on the compensation method. Pixels including the compensation circuit (CC) can have various structures such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, 7T2C.

[0084] The display device 100 according to an embodiment of the present specification can have a bottom emission structure in which light emitted from the light emitting element (ED) is emitted downward. The display device 100 according to an embodiment of the present specification can deform the structure of the layer provided under the light emitting element (ED) to improve the extraction efficiency of the light emitted from the light emitting element (ED). Hereinafter, with reference to FIGS. 5 to 10, the structure for improving the light extraction efficiency will be described more specifically.

[0085] FIG. 5 is a cross-sectional view showing an embodiment of a sub-pixel according to I-I' shown in FIG. 3 according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view showing an example of the light path according to an embodiment of the present invention.

[0086] Referring to FIG. 5, the display panel 110 according to an embodiment of the present specification includes 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 element layer 240, and a sealing layer 250 can be disposed between the first substrate 111 and the second substrate 112.

[0087] The circuit element layer 210 can include circuit elements such as various signal wirings, thin film transistors, and capacitors for each sub-pixel (SP1, SP2, SP3). The signal wiring can include a scan line, a data line, a power supply line, etc., and the thin film transistor can include a switching transistor, a driving transistor, etc. Further, the circuit element layer 210 can further include a plurality of insulating layers laminated on the first substrate 111.

[0088] The color filter layer 220 can be provided on the circuit element layer 210. The color filter layer 220 can be patterned for each sub-pixel (SP1, SP2, SP3). Specifically, the color filter layer 220 can include a first color filter (CF1), a second color filter (CF2), and a third color filter (not shown). The first color filter (CF1) can be arranged to correspond to the light emitting region (EA1) of the first sub-pixel (SP1), and as an example, it can be a red color filter that transmits red light. The second color filter can be arranged to correspond to the light emitting region (EA2) of the second sub-pixel (SP2), and it can be a green color filter that transmits green light. The third color filter can be arranged to correspond to the light emitting region of the third sub-pixel (SP3), and it can be a blue color filter that transmits blue light. When the pixel further includes a fourth sub-pixel, the color filter layer 220 can further include a fourth color filter. The fourth color filter can be arranged to correspond to the light emitting region of the fourth sub-pixel, and it can be a white color filter that transmits white light. The white color filter can be made of a transparent organic substance that transmits white light, but is not necessarily limited thereto. The white color filter can also be omitted.

[0089] As shown in FIG. 5, the first to third color filters (CF1 to CF3) can at least partially overlap each other in the region between the sub-pixels (SP1, SP2, SP3), but are not necessarily limited thereto. The first to third color filters (CF1 to CF3) can also be arranged separately in the region between the sub-pixels (SP1, SP2, SP3). According to an embodiment, the first, second, and third color filters (CF1, CF2, CF3) all overlap each other between adjacent sub-pixels to serve as a black matrix and can prevent light mixing, but the embodiment is not necessarily limited thereto.

[0090] The organic insulating layer 230 can be provided on the color filter layer 220. The organic insulating layer 230 can include two organic insulating layers having different refractive indexes from each other in order to improve the extraction efficiency of the light emitted from the light emitting element (ED). The organic insulating layer 230 can include a first organic insulating layer (OC1) and a second organic insulating layer (OC2).

[0091] The first organic insulating layer (OC1) can be provided on the color filter layer 220 and can have a first refractive index. The second organic insulating layer (OC2) can be provided on the first organic insulating layer (OC1) and can have a second refractive index. In one example, the second refractive index may be greater than the first refractive index.

[0092] Since the second organic insulating layer (OC2) has a refractive index greater than that of the first organic insulating layer (OC1), the light emitted from the light emitting element (ED) can be refracted or reflected at the interface between the second organic insulating layer (OC2) and the first organic insulating layer (OC1) to change the light path. The display panel 110 according to an embodiment of the present specification can improve the light extraction efficiency by the changed light path.

[0093] Further, the first organic insulating layer (OC1) and the second organic insulating layer (OC2) can have inclined surfaces in the regions between the sub-pixels (SP1, SP2, SP3). For example, one or more of the first organic insulating layer (OC1) and the second organic insulating layer (OC2) can have inclined surfaces in the regions between adjacent sub-pixels.

[0094] Specifically, in the first organic insulating layer (OC1), a first flat surface (S11) is formed in the region overlapping each of the sub-pixels (SP1, SP2, SP3), and a first concave portion (CV1) that is recessed toward the first substrate 111 can be formed in the region between the sub-pixels (SP1, SP2, SP3). For example, the first concave portion (CV1) can be a kind of channel or ditch between adjacent sub-pixels, but the embodiments are not limited thereto. Further, the first concave portion (CV1) can also extend around one or more sides of each sub-pixel (SP1 to SP3). The first concave portion (CV1) of the first organic insulating layer (OC1) can include an opening region (OA) that exposes at least a part of the color filters (CF1, CF2), as shown in FIG. 5. For example, the opening region (OA) can extend through the first organic insulating layer (OC1), but is not limited thereto. In such a case, the first concave portion (CV1) of the first organic insulating layer (OC1) can form inclined surfaces (S12, hereinafter referred to as "first inclined surfaces") on at least one side of the opening region (OA). The first inclined surfaces (S12) can have a high or steep first inclination angle (θ1). In one embodiment, the first inclination angle (θ1) can be 70° or more.

[0095] Since the first organic insulating layer (OC1) has a high first inclination degree (θ1) of the first inclined surface (S12), it can have a relatively large first thickness (T1). For example, the first organic insulating layer (OC1) may be thicker than the second organic insulating layer (OC2), but it is not limited thereto. According to other embodiments, the second organic insulating layer (OC2) may be thicker than the first organic insulating layer (OC1). Also, the first and second organic insulating layers (OC1, OC2) can have the same thickness, and by changing the width of the opening region (OA), the inclination of each organic insulating layer can be adjusted. The first organic insulating layer (OC1) can be made of an organic material. The organic material can change in thickness and planarization characteristics depending on the viscosity. The first organic insulating layer (OC1) can be made of an organic material having a high first viscosity. As an example, the first organic insulating layer (OC1) can be made of photoacrylic (PAC). The first organic insulating layer (OC1) has a large first thickness (T1) compared to the second organic insulating layer (OC2) and can planarize the surface uniformly (for example, T1 may be larger than T2).

[0096] In the display panel 110 according to an embodiment of the present specification, since the first inclined surface (S12) of the first organic insulating layer (OC1) has a high or steep first inclination degree (θ1), the separation distance between the sub-pixels (SP1, SP2, SP3) can be reduced. For example, by making the first inclination degree (θ1) steeper, the interval between the sub-pixels (SP1 to SP3) can be made closer, which can increase the density of the sub-pixels and improve the resolution.

[0097] In the second organic insulating layer (OC2), a first flat surface (S21) can be formed in a region overlapping each of the sub-pixels (SP1, SP2, SP3), and a second concave portion (CV2) formed in a concave shape toward the first substrate 111 can be formed in a region between the sub-pixels (SP1, SP2, SP3). The second concave portion (CV2) can be arranged corresponding to the first concave portion (CV1) of the first organic insulating layer (OC1). At least a part of the second concave portion (CV2) of the second organic insulating layer (OC2) can overlap with the first concave portion (CV1) of the first organic insulating layer (OC1).

[0098] As shown in FIG. 5, the second recess (CV2) of the second organic insulating layer (OC2) can be formed to cover or partially overlap the color filters (CF1, CF2) exposed by the opening region (OA) of the first organic insulating layer (OC1). In such a case, the second recess (CV2) of the second organic insulating layer (OC2) can form a second flat surface (S23) and inclined surfaces (S22, hereinafter referred to as "second inclined surfaces") having a height lower than that of the first flat surface (S21). The second inclined surface (S22) can be disposed on at least one side of the second flat surface (S23) and can be a surface connecting the first flat surface (S21) and the second flat surface (S23). The second inclined surface (S22) can at least partially overlap the first inclined surface (S12) of the first organic insulating layer (OC1). FIG. 5 illustrates the formation of the second flat surface (S23) in the second recess (CV2), but it is not necessarily limited thereto. The second recess (CV2) of the second organic insulating layer (OC2) can also omit the second flat surface (S23) depending on the separation distance between the sub-pixels (SP1, SP2, SP3) or the viscosity of the organic material forming the second organic insulating layer (OC2). Alternatively, the second recess (CV2) of the second organic insulating layer (OC2) may not be a flat surface (for example, it can have a texture or be wavy, etc., and can correspond to the lowermost region of the second recess (CV2)).

[0099] The second inclined surface (S22) of the second organic insulating layer (OC2) can have a second inclination degree (θ2) that is less steep or gentler than the first inclination degree of the first organic insulating layer (OC1) (for example, S12 > S22). In one embodiment, the second inclination degree (θ2) can be 45° or less.

[0100] Since the second organic insulating layer (OC2) has a second inclination angle (θ2) with a low second inclined surface (S22), it can have a relatively thin second thickness (T2) (for example, T2 < T1). When the second thickness (T2) of the second organic insulating layer (OC2) is too thick, the horizontal distance of the second inclined surface (S22) of the second organic insulating layer (OC2) can become long in order to form the second inclination angle (θ2) at 45° or less. Also, the inclination of the second inclination angle (θ2) can be adjusted according to the thickness of the second organic insulating layer (OC2) and / or the width of the opening region (OA) of the first organic insulating layer (OC1). As the horizontal distance of the second inclined surface (S22) of the second organic insulating layer (OC2) becomes long, the separation distance between the sub-pixels (SP1, SP2, SP3) becomes large. Thereby, the display panel 110 may have a reduced aperture ratio and a reduced or potentially reduced image resolution. The display panel 110 according to an embodiment of the present specification can increase the sub-pixel density and provide a higher resolution without increasing the separation distance between the sub-pixels (SP1, SP2, SP3) while forming the second inclined surface (S22) of the second organic insulating layer (OC2) with the second inclination angle (θ2) at 45° or less by forming the second thickness (T2) of the second organic insulating layer (OC2) to be thin.

[0101] The second organic insulating layer (OC2) can be made of an organic material. The organic material can change in thickness and planarization characteristics depending on the viscosity. The second organic insulating layer (OC2) can be made of an organic material having a low second viscosity (for example, a viscosity lower than the viscosity of the first organic insulating layer (OC1)). As an example, the second organic insulating layer (OC2) can be made of a polyimide (PI) or siloxane-based organic material. The second organic insulating layer (OC2) has a second thickness (T2) that is thinner than the first organic insulating layer (OC1), and planarization can be made not to be performed well in the second recess (CV2). Thereby, the second organic insulating layer (OC2) can sufficiently secure the area of the second inclined surface (S22) in the second recess (CV2).

[0102] The second organic insulating layer (OC2) (or the second recess (CV2)) can be formed to cover the color filters (CF1, CF2) exposed by the opening area (OA) of the first organic insulating layer (OC1). Thereby, the second organic insulating layer (OC2) can block the gas that can out-gas from the color filters (CF1, CF2) from moving to the light-emitting element (ED), prevent image defects, and extend the life of the device.

[0103] The light-emitting element layer 240 can be disposed on the organic insulating layer 230. The light-emitting element layer 240 can include light-emitting elements (ED) provided in each of the sub-pixels (SP1, SP2, SP3). Each of the light-emitting elements (ED) can include a first electrode (E1), a light-emitting layer (EL), and a second electrode (E2).

[0104] The first electrode (E1) can be provided on the organic insulating layer 230. Specifically, the first electrode (E1) can be provided separately for each sub-pixel (SP1, SP2, SP3) on the first flat surface (S21) of the second organic insulating layer (OC2). And the first electrode (E1) can be connected to the driving transistor (DT, see FIG. 4). Specifically, the first electrode (E1) can be connected to one of the source electrode and the drain electrode of the driving transistor (DT, see FIG. 4) through a contact hole penetrating at least a part of the plurality of insulating layers provided in the organic insulating layer 230 and the circuit element layer 210.

[0105] The first electrode (E1) may have at least one side end that is the same as the end of the light-emitting region (EA1, EA2). According to an embodiment of the present specification, the display panel 110 can be made thinner and the number of processes can be reduced because a separate bank is not formed on the first electrode (E1). As a result, the entire region of the first electrode (E1) is formed to be in contact with the light-emitting layer (EL), and light emission can be performed in the light-emitting layer (EL). Since the first electrode (E1) is in contact with the light-emitting layer (EL) without a bank being formed in the end region, at least one side end may be the same as the end of the light-emitting region (EA1, EA2). As shown in FIG. 5, the first electrode (E1) provided in the first sub-pixel (SP1) has the end on the side facing the second sub-pixel (SP2) that is the same as the end of the first light-emitting region (EA1), and the first electrode (E1) provided in the second sub-pixel (SP2) may have the end on the side facing the first sub-pixel (SP1) that is the same as the end of the second light-emitting region (EA2). The non-light-emitting region (NEA) may be between the end of the first electrode (E1) provided in the first sub-pixel (SP1) and the end of the first electrode (E1) provided in the second sub-pixel (SP2). Such a display panel 110 according to an embodiment of the present specification can increase the area of the light-emitting regions (EA1, EA2) and improve the aperture ratio, and can achieve a higher resolution by not forming a separate bank on the first electrode (E1). For example, since the omission of the bank at the end of the first electrode (E1) can be avoided, the sub-pixels can be made finer and denser.

[0106] The first electrode (E1) can include a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO that can transmit light. The first electrode (E1) can include a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag), and can have a thin thickness through which light can pass. When the first electrode (E1) is formed of a semi-transmissive conductive material, the light extraction efficiency can be increased by a micro cavity. Such a first electrode (E1) can be the anode electrode of the light-emitting device (ED).

[0107] The light-emitting layer (EL) can be disposed on the first electrode (E1). The light-emitting layer (EL) can include an emission material layer (Emission Material Layer; EML) containing an emission material. The emission material can include an organic material, an inorganic material, or a hybrid material. The light-emitting layer (EL) can have a multilayer structure. For example, the light-emitting layer (EL) can further include at least one of a hole injection layer (Hole Injection Layer; HIL), a hole transport layer (Hole Transport Layer; HTL), an electron transport layer (Electron Transport Layer; ETL), and an electron injection layer (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 move to the emission material layer through the hole transport layer and the electron transport layer, respectively, and combine with each other in the emission material layer to emit light.

[0108] In one embodiment, the light-emitting layer (EL) can be a common layer formed commonly for the sub-pixels (SP1, SP2, SP3). Here, the light-emitting layer (EL) can be a white light-emitting layer that emits white light. In such a case, the light-emitting layer (EL) can be formed not only in the sub-pixels (SP1, SP2, SP3) but also in the region between the sub-pixels (SP1, SP2, SP3). The light-emitting layer (EL) can be formed continuously in the sub-pixels (SP1, SP2, SP3) and between the sub-pixels (SP1, SP2, SP3). That is, the light-emitting layer (EL) can be arranged across the sub-pixels as a common sheet layer. The light-emitting layer (EL) can be formed on the second recess (CV2) of the second organic insulating layer (OC2) between the sub-pixels (SP1, SP2, SP3) and can be formed along the second inclined surface (S22). The light-emitting layer (EL) can form an inclined surface (ELS, hereinafter referred to as "third inclined surface") that at least partially overlaps with the second inclined surface (S22) of the second organic insulating layer (OC2). For example, the inclination of the third inclined surface (ELS) can be the same as that of the second inclined surface (S22).

[0109] In other embodiments, the light-emitting layer (EL) can be formed individually or independently for each of the sub-pixels (SP1, SP2, SP3). As an example, a red light-emitting layer that emits red light can be formed in the first sub-pixel (SP1), a green light-emitting layer that emits green light can be formed in the second sub-pixel (SP2), and a blue light-emitting layer that emits blue light can be formed in the third sub-pixel (SP3).

[0110] The second electrode (E2) can be disposed on the light-emitting layer (EL). The second electrode (E2) can be a common layer formed commonly for the sub-pixels (SP1, SP2, SP3). The second electrode (E2) can be formed not only on the sub-pixels (SP1, SP2, SP3) but also on the regions between the sub-pixels (SP1, SP2, SP3). The second electrode (E2) can be formed continuously on the sub-pixels (SP1, SP2, SP3) and between the sub-pixels (SP1, SP2, SP3). The second electrode (E2) can be formed on the second recess (CV2) of the second organic insulating layer (OC2) between the sub-pixels (SP1, SP2, SP3) and can be formed along the second inclined surface (S22). That is, the second electrode (E2) can be disposed on the common sheet layer across the sub-pixels. When the light-emitting layer (EL) is formed of a common layer, the second electrode (E2) can be formed along the third inclined surface (ELS) on the third inclined surface (ELS) of the light-emitting layer (EL) as shown in FIG. 5. The second electrode (E2) can form an inclined surface (ES, hereinafter referred to as "fourth inclined surface") that at least partially overlaps with the second inclined surface (S22) of the second organic insulating layer (OC2). For example, the fourth inclined surface (ES) can be the same as the inclined surfaces of the third inclined surface (ELS) and the second inclined surface (S22).

[0111] The second electrode (E2) can contain a conductive material having a high reflectivity. The second electrode (E2) can contain metals such as aluminum (Al), silver (Ag), titanium (Ti), and silver-palladium-copper (APC) alloy. Such a second electrode (E2) can be a cathode electrode.

[0112] According to an embodiment of the present specification, the display panel 110 can form a fourth inclined surface (ES) on the second electrode (E2) by including a first concave portion (CV1) of a first organic insulating layer (OC1) and a second concave portion (CV2) of a second organic insulating layer (OC2). As shown in FIG. 6, in the display panel 110 according to an embodiment of the present specification, when the light (L) emitted from the light-emitting element (ED) moves to the side surface, it is reflected by the fourth inclined surface (ES) (or the third inclined surface (ELS)) provided in the second electrode (E2) (or the light-emitting layer), and the optical path can be changed in the downward direction or the front direction toward the viewer or the user. For example, the cross-section of the second electrode in the non-light-emitting region between the first sub-pixel and the second sub-pixel can have a "V" shape, and the light emitted from the first light-emitting region (EA1) or the second light-emitting region (EA2) can be reflected in the downward direction toward the first substrate (for example, the forward direction toward the user). Thereby, the display panel 110 according to an embodiment of the present specification can improve the light extraction efficiency, prevent color mixing from occurring between adjacent sub-pixels (SP1, SP2, SP3), further reduce the thickness of the display device, bundle the sub-pixels closer together, and reduce the number of manufacturing steps.

[0113] The encapsulation layer 250 can be disposed on the light-emitting element layer 240. The encapsulation layer 250 can prevent damage to the light-emitting element (ED) caused by moisture and impact from the outside. The encapsulation layer 250 can have a multilayer structure. For example, the encapsulation layer 250 can include at least one inorganic film and at least one organic film.

[0114] According to an embodiment of the present specification, in the display panel 110, since the second organic insulating layer (OC2) has a refractive index greater than that of the first organic insulating layer (OC1), the light emitted from the light-emitting element (ED) can be refracted or reflected at the interface between the second organic insulating layer (OC2) and the first organic insulating layer (OC1) to change the optical path. According to an embodiment of the present specification, the light extraction efficiency can be improved by the changed optical path.

[0115] In addition, the display panel 110 according to an embodiment of the present specification can flatten the steps generated in the circuit element layer 210 and the color filter layer 220 because the first organic insulating layer (OC1) has a first thickness (T1) that is thick.

[0116] In addition, the display panel 110 according to an embodiment of the present specification can include a first recess (CV1) including a first inclined surface (S12) in a region between sub-pixels (SP1, SP2, SP3) of the first organic insulating layer (OC1). As a result, in the display panel 110 according to an embodiment of the present specification, an inclined surface (S22, ELS, ES) can also be formed on each of the second organic insulating layer (OC2), the light emitting layer (EL), and the second electrode (E2) that are sequentially stacked on the first inclined surface (S12) of the first organic insulating layer (OC1). Further, the second recess (CV2) may overlap with the first recess (CV1) and may have a wider width.

[0117] In particular, in the display panel 110 according to an embodiment of the present specification, since the second electrode (E2) which is a reflective metal includes an inclined surface (ES) inclined toward the first substrate 111 in a region between sub-pixels (SP1, SP2, SP3), the light extraction efficiency can be improved. In the display panel 110 according to an embodiment of the present specification, the light (L) emitted from the light emitting element (ED) and moving to the side can be reflected by the inclined surface (ES) of the second electrode (E2) to change the light path in the front or lower direction. As a result, the display panel 110 according to an embodiment of the present specification can improve the light extraction efficiency, prevent color mixing from occurring between adjacent sub-pixels (SP1, SP2, SP3), further reduce the thickness of the display device, bundle the sub-pixels closer together, and reduce the number of manufacturing steps.

[0118] Also, in the display panel 110 according to an embodiment of the present specification, by forming the thickness (T1) of the first organic insulating layer (OC1) thick, the depth (or vertical distance) of the first recess (CV1) can be formed deep. Thereby, the first inclined surface (S12) of the first recess (CV1) can have a larger area. In the display panel 110 according to an embodiment of the present specification, the second, third, and fourth inclined surfaces (S22, ELS, ES) of the second organic insulating layer (OC2), the light-emitting layer (EL), and the second electrode (E2), which are sequentially stacked on the first inclined surface (S12) of the first recess (CV1), can also have larger areas. As a result, in the display panel 110 according to an embodiment of the present specification, since the inclined surface (ES) of the second electrode (E2) has a large area, the area where light can be incident can be increased, and the light extraction efficiency can also be increased. The display panel 110 according to an embodiment of the present specification can have a high light extraction efficiency even at low power, and can further reduce power consumption. Also, the display panel 110 according to an embodiment of the present specification can increase the resolution by bringing sub-pixels into close contact with each other, can omit a bank or the like, can be made thinner, can reduce the manufacturing process to improve efficiency, and can save costs.

[0119] Also, in the display panel 110 according to an embodiment of the present specification, by having the first inclined surface (S12) of the first organic insulating layer (OC1) have a high or steep first inclination angle (θ1) (for example, the first inclination angle (θ1)> the second inclination angle (θ2)), the separation distance between sub-pixels (SP1, SP2, SP3) can be shortened, and the sub-pixels can be arranged closer to each other. The display panel 110 according to an embodiment of the present specification can reduce the area of the non-light-emitting region (NEA), improve the aperture ratio, and provide a higher resolution.

[0120] In addition, in the display panel 110 according to an embodiment of the present specification, the second inclined surface (S22) of the second organic insulating layer (OC2) can have a second inclination degree (θ2) that is lower or gentler than the first inclined surface (S12) of the first organic insulating layer (OC1). On the second inclined surface (S22) of the second organic insulating layer (OC2), a light-emitting layer (EL) and a second electrode (E2) can be formed. The light-emitting layer (EL) is made of an organic material and can be formed with a uniform thickness on the second organic insulating layer (OC2). That is, the thickness of the light-emitting layer (EL) on the first flat surface (S21) of the second organic insulating layer (OC2) and the thickness of the light-emitting layer (EL) on the second inclined surface (S22) of the second organic insulating layer (OC2) may not have a large difference.

[0121] On the other hand, the second electrode (E2) is made of a reflective metal material, and the step coverage may not be good. The second electrode (E2) can be formed to have a thinner thickness on the second inclined surface (S22) of the second organic insulating layer (OC2) than on the first flat surface (S21) of the second organic insulating layer (OC2).

[0122] As the inclination degree of the second inclined surface (S22) of the second organic insulating layer (OC2) rapidly increases, the second electrode (E2) can be formed to have a thinner thickness deposited on the second inclined surface (S22) of the second organic insulating layer (OC2). In such a case, a region where the second electrode (E2) becomes thinner and does not deposit or cracks may occur on the second inclined surface (S22) of the second organic insulating layer (OC2). In such a situation, since the second electrode (E2) cannot completely cover the light-emitting layer (EL), moisture, oxygen, etc. can penetrate into the light-emitting layer (EL), causing deterioration of the light-emitting element (ED).

[0123] According to an embodiment of the present specification, in the display panel 110, since the second inclined surface (S22) of the second organic insulating layer (OC2) has a low or much gentler second inclination angle (θ2), the second electrode (E2) can be safely and uniformly vapor-deposited on the second inclined surface (S22) of the second organic insulating layer (OC2) to a thickness of a predetermined thickness or more. According to an embodiment of the present specification, by forming the second inclined surface (S22) gently or not so steeply, the second electrode (E2) can be thinly and uniformly formed on the second inclined surface (S22) of the second organic insulating layer (OC2) without gaps or cracks, and deterioration of the light-emitting element (ED) can be prevented.

[0124] On the other hand, according to an embodiment of the present specification, in the display panel 110, by forming the thickness (T2) of the second organic insulating layer (OC2) thinly, even if the second inclined surface (S22) of the second organic insulating layer (OC2) has a low second inclination angle (θ2), the separation distance between the sub-pixels (SP1, SP2, SP3) may not increase. Further, according to an embodiment of the present specification, by reducing the overall thickness of the first organic insulating layer (OC1) and the second organic insulating layer (OC2), it is possible to prevent a light leakage phenomenon in which light emitted from the light-emitting element (ED) leaks to adjacent sub-pixels (SP1, SP2, SP3). As a result, it is possible to provide a thinner device with improved luminance and reduced power consumption.

[0125] FIG. 7 is a cross-sectional view showing another embodiment of a sub-pixel taken along line I-I' shown in FIG. 3, and FIG. 8 is a cross-sectional view showing an example of an ashing process for a second organic insulating layer.

[0126] The display panel 110 shown in FIG. 7 has a difference only in the organic insulating layer (OC) compared to the display panel 110 shown in FIG. 5, and the remaining configurations are substantially the same, so a detailed description of the remaining configurations will be omitted.

[0127] Referring to FIG. 7, a display panel 110 according to another embodiment of the present specification includes 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 element layer 240, and a sealing layer 250 can be disposed between the first substrate 111 and the second substrate 112.

[0128] The organic insulating layer 230 can be provided on the color filter layer 220. The organic insulating layer 230 can include two organic insulating layers having different refractive indexes from each other in order to improve the extraction efficiency of light emitted from a light emitting element (ED). The organic insulating layer 230 can include a first organic insulating layer (OC1) and a second organic insulating layer (OC2).

[0129] The first organic insulating layer (OC1) is provided on the color filter layer 220 and can have a first refractive index. The second organic insulating layer (OC2) is provided on the first organic insulating layer (OC1) and can have a second refractive index. As an example, the second refractive index may be greater than the first refractive index.

[0130] Since the second organic insulating layer (OC2) has a refractive index greater than that of the first organic insulating layer (OC1), the light emitted from the light emitting element (ED) can be refracted or reflected at the interface between the second organic insulating layer (OC2) and the first organic insulating layer (OC1) to change the optical path. The display panel 110 according to an embodiment of the present specification can improve the light extraction efficiency by the changed optical path.

[0131] In addition, the first organic insulating layer (OC1) and the second organic insulating layer (OC2) can have inclined surfaces in the regions between the sub-pixels (SP1, SP2, SP3).

[0132] Specifically, in the first organic insulating layer (OC1), a first flat surface (S11) is formed in a region overlapping each of the sub-pixels (SP1, SP2, SP3), and a first concave portion (CV1) formed in a concave shape toward the first substrate 111 can be formed in a region between the sub-pixels (SP1, SP2, SP3). As shown in FIG. 7, the first concave portion (CV1) of the first organic insulating layer (OC1) can include an opening region (OA) that exposes at least a part of the color filters (CF1, CF2). In such a case, a first inclined surface (S12) can be formed on at least one side of the opening region (OA) in the first concave portion (CV1) of the first organic insulating layer (OC1). The first inclined surface (S12) can have a high first inclination angle (θ1). In one embodiment, the first inclination angle (θ1) can be 70° or more.

[0133] Since the first inclined surface (S12) of the first organic insulating layer (OC1) has a high first inclination angle (θ1), the first organic insulating layer (OC1) can have a relatively large first thickness (T1). The first organic insulating layer (OC1) can be made of an organic material. The thickness and planarization characteristics of the organic material can change depending on the viscosity. The first organic insulating layer (OC1) can be made of an organic material having a high first viscosity. As an example, the first organic insulating layer (OC1) can be made of photoacrylic (PAC). The first organic insulating layer (OC1) has a larger first thickness (T1) compared to the second organic insulating layer (OC2) and can planarize the surface uniformly.

[0134] In the display panel 110 according to another embodiment of the present specification, since the first inclined surface (S12) of the first organic insulating layer (OC1) has a high first inclination angle (θ1), the separation distance between the sub-pixels (SP1, SP2, SP3) can be reduced. By such a method, more sub-pixels can be bundled closer together, and a higher resolution can be provided.

[0135] The second organic insulating layer (OC2) can form a first flat surface (S21) in a region overlapping with each of the sub-pixels (SP1, SP2, SP3), and can form a second concave portion (CV2) that is recessed toward the first substrate 111 in a region between the sub-pixels (SP1, SP2, SP3). At least a part of the second concave portion (CV2) of the second organic insulating layer (OC2) can overlap with the first concave portion (CV1) of the first organic insulating layer (OC1). For example, the center or the lowest point of the second concave portion (CV2) of the second organic insulating layer (OC2) can overlap with the center or the lowest point of the first concave portion (CV1) of the first organic insulating layer (OC1), but the embodiments are not limited thereto.

[0136] As shown in FIG. 7, the second concave portion (CV2) of the second organic insulating layer (OC2) can be formed to cover a portion of the color filters (CF1, CF2) exposed by the opening region (OA) of the first organic insulating layer (OC1). In such a case, the second concave portion (CV2) of the second organic insulating layer (OC2) can form a second flat surface (S23) (for example, the lowermost surface) and a second inclined surface (S22) that are provided at a height lower than that of the first flat surface (S21). The second inclined surface (S22) can be disposed on at least one side of the second flat surface (S23) and can be a surface connecting the first flat surface (S21) and the second flat surface (S23). At least a part of the second inclined surface (S22) can overlap with the first inclined surface (S12) of the first organic insulating layer (OC1). Although FIG. 7 illustrates that the second flat surface (S23) is formed in the second concave portion (CV2), the present invention is not necessarily limited thereto. The second concave portion (CV2) of the second organic insulating layer (OC2) can also omit the second flat surface (S23) depending on the separation distance between the sub-pixels (SP1, SP2, SP3) or the viscosity of the organic material forming the second organic insulating layer (OC2). Alternatively, the second concave portion (CV2) of the second organic insulating layer (OC1) may have a non-flat second flat surface (S23) (for example, it may be a point, a textured surface, or wavy).

[0137] The second inclined surface (S22) of the second organic insulating layer (OC2) can have a second inclination degree (θ2) that is lower than or gentler than the first inclination degree (θ1) of the first organic insulating layer (OC1). In one embodiment, the second inclination degree (θ2) can be 45° or less (for example, the first inclination degree (θ1) > the second inclination degree (θ2)).

[0138] Since the second organic insulating layer (OC2) has a low second inclination degree (θ2) of the second inclined surface (S22), it can 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) can become long in order to form the second inclination degree (θ2) at 45° or less. As the horizontal distance of the second inclined surface (S22) of the second organic insulating layer (OC2) becomes long, the separation distance between the sub-pixels (SP1, SP2, SP3) can become large. Thereby, the aperture ratio of the display panel 110 can decrease. The display panel 110 according to other embodiments of the present specification forms the second thickness (T2) of the second organic insulating layer (OC2) thinly, so that the second inclined surface (S22) of the second organic insulating layer (OC2) can form the second inclination degree (θ2) at 45° or less without increasing the separation distance between the sub-pixels (SP1, SP2, SP3), and the sub-pixels can be arranged closer to each other.

[0139] The second organic insulating layer (OC2) can be made of an organic material. The thickness and planarization characteristics of the organic material can change depending on the viscosity. The second organic insulating layer (OC2) can be made of an organic material having a low second viscosity. As an example, the second organic insulating layer (OC2) can be made of a polyimide (PI) or siloxane-based organic material. The second organic insulating layer (OC2) has a thinner second thickness (T2) compared to the first organic insulating layer (OC1), and can prevent good planarization in the second concave portion (CV2). Thereby, the second organic insulating layer (OC2) can sufficiently secure the area of the second inclined surface (S22) in the second concave portion (CV2).

[0140] On the one hand, for the second organic insulating layer (OC2) shown in FIG. 7, the third thickness (T3) at the point where the third flat surface (S23) or the second inclined surfaces (S22) provided to face each other meet may be thinner than the second thickness (T2) on the first flat surface (S21) (for example, T3 < T2 < T1).

[0141] Specifically, the second organic insulating layer (OC2) according to an embodiment of the present specification shown in FIG. 5 can simultaneously form the first flat surface (S21), the second inclined surface (S22), and the third flat surface (S23). In such a second organic insulating layer (OC2), a difference may occur within a range where the second thickness (T2) on the first flat surface (S21) is the same as or thinner than the third thickness (T3) at the point where the third flat surface (S23) or the second inclined surfaces (S22) provided to face each other meet (for example, in FIG. 5, T2 may be the same as or substantially the same as T3).

[0142] On the other hand, the second organic insulating layer (OC2) according to another embodiment of the present specification shown in FIG. 7 cannot simultaneously form the first flat surface (S21), the second inclined surface (S22), and the third flat surface (S23). First, the second organic insulating layer (OC2) can be formed with a second thickness (T2) on the first flat surface (S11) and the first inclined surface (S12) of the first organic insulating layer (OC1). Next, as shown in FIG. 8, a photoresist pattern (PR) is formed on the first flat surface (S21) of the second organic insulating layer (OC2), and NF 3 、O 2An ashing process can be performed using gases such as these. The second organic insulating layer (OC2) can have a portion removed from the region not covered by the photoresist pattern (PR) through the ashing process, that is, the region between the sub-pixels (SP1, SP2, SP3), and while the thickness decreases, a second inclined surface (S22) and a third flat surface (S23) can be formed. That is, after forming the first flat surface (S21), the second recess (CV2) of the second organic insulating layer (OC2) can be etched deeper in sequence to further change the second inclined surface (S22) and the third flat surface (S23). Thereby, the second organic insulating layer (OC2) can be formed to have a third thickness (T3) at the point where the third flat surface (S23) or the second inclined surfaces (S22) provided to face each other meet, to be thinner than the second thickness (T2) at the first flat surface (S21) (for example, T3 < T2 in FIG. 7). Here, the third thickness (T3) at the point where the third flat surface (S23) or the second inclined surfaces (S22) provided to face each other meet can have the minimum thickness covering the color filters (CF1, CF2).

[0143] In the display panel 110 according to another embodiment of the present specification, since the second recess (CV2) of the second organic insulating layer (OC2) has a maximum depth (or vertical distance) through the ashing process, the second inclined surface (S22) of the second recess (CV2) can have the maximum area capable of reflecting more light. Thereby, in the display panel 110 according to another embodiment of the present specification, the inclined surface (ES) of the second electrode (E2) can have the maximum area, and the light extraction efficiency can also be maximized.

[0144] The second organic insulating layer (OC2) (or the second recess (CV2)) can be formed to cover the color filters (CF1, CF2) exposed by the opening region (OA) of the first organic insulating layer (OC1). Thereby, the second organic insulating layer (OC2) can block the movement of the gas that can out-gas from the color filters (CF1, CF2) to the light-emitting element (ED).

[0145] FIG. 9 is a cross-sectional view showing another embodiment of the sub-pixels taken along line I-I' shown in FIG. 3.

[0146] The display panel 110 shown in FIG. 9 has a difference in that it further includes a bank (BN) compared with the display panel 110 shown in FIG. 5, and the remaining configurations are substantially the same, so the specific description of the remaining configurations will be omitted.

[0147] Referring to FIG. 9, the display panel 110 according to another embodiment of the present specification includes 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 element layer 240, and a sealing layer 250 can be disposed between the first substrate 111 and the second substrate 112.

[0148] The light-emitting element layer 240 can be disposed on the organic insulating layer 230. The light-emitting element layer 240 can include light-emitting elements (ED) and a bank (BN) provided for each of the sub-pixels (SP1, SP2, SP3). Each of the light-emitting elements (ED) can include a first electrode (E1), a light-emitting layer (EL), and a second electrode (E2).

[0149] The bank (BN) can cover or overlap the ends of the first electrodes (E1) provided in each of the sub-pixels (SP1, SP2, SP3). The bank (BN) may not overlap with the first recess (CV1) of the first organic insulating layer (OC1) and the second recess (CV2) of the second organic insulating layer (OC2). The banks (BN) may not be connected to each other in the region between the sub-pixels (SP1, SP2, SP3). As an example, the bank (BN) formed to cover the end of the first electrode (E1) of the first sub-pixel (SP1) can be spaced apart with the first recess (CV1) of the first organic insulating layer (OC1) and the second recess (CV2) of the second organic insulating layer (OC2) interposed therebetween from the bank (BN) formed to cover the end of the first electrode (E1) of the second sub-pixel (SP2). The bank (BN) can be provided with an opening through which the first electrode (E1) is exposed to define a first light-emitting region (EA1) and a second light-emitting region (EA2). The region provided with the bank (BN) can be included in the non-light-emitting region (NEA).

[0150] The light-emitting layer (EL) of the light-emitting element (ED) can be formed continuously between the sub-pixels (SP1, SP2, SP3) and between the sub-pixels (SP1, SP2, SP3). The light-emitting layer (EL) can be formed on the first electrode (E1) exposed by the opening of the bank (BN) in each of the sub-pixels (SP1, SP2, SP3). Also, the light-emitting layer (EL) can be formed on the second recess (CV2) of the bank (BN) and the second organic insulating layer (OC2) between the sub-pixels (SP1, SP2, SP3). Here, the light-emitting layer (EL) is formed along one side of the bank (BN) and the second inclined surface (S22) of the second organic insulating layer (OC2) to form a third inclined surface (ELS).

[0151] The second electrode (E2) of the light-emitting element (ED) can be formed not only on the sub-pixels (SP1, SP2, SP3) but also on the regions between the sub-pixels (SP1, SP2, SP3). The second electrode (E2) can be formed continuously on the sub-pixels (SP1, SP2, SP3) and between the sub-pixels (SP1, SP2, SP3). The second electrode (E2) can be formed on the first electrode (E1) exposed by the opening of the bank (BN) in each of the sub-pixels (SP1, SP2, SP3). Further, the second electrode (E2) can be formed on the second recess (CV2) of the bank (BN) and the second organic insulating layer (OC2) between the sub-pixels (SP1, SP2, SP3). Here, the second electrode (E2) is formed along one side of the bank (BN) and the second inclined surface (S22) of the second organic insulating layer (OC2), and can form a fourth inclined surface (ES).

[0152] In the display panel 110 according to another embodiment of the present specification, since the second electrode (E2) is formed not only on the second inclined surface (S22) of the second organic insulating layer (OC2) but also on one side of the bank (BN), the area of the fourth inclined surface (ES) can be increased to capture and reflect more light. In the display panel 110 according to another embodiment of the present specification, as the area of the fourth inclined surface (ES) of the second electrode (E2) increases, the area where light can enter can increase, and the light extraction efficiency can be further increased.

[0153] FIG. 10 is a cross-sectional view showing another embodiment of the sub-pixel taken along the line I-I' shown in FIG. 3.

[0154] The display panel 110 shown in FIG. 10 has a difference only in the organic insulating layer (OC) compared with the display panel 110 shown in FIG. 5, and the remaining configurations are substantially the same. Therefore, the specific description of the remaining configurations will be omitted.

[0155] Referring to FIG. 10, a display panel 110 according to another embodiment of the present specification includes 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 element layer 240, and a sealing layer 250 can be disposed between the first substrate 111 and the second substrate 112.

[0156] The organic insulating layer 230 can be provided on the color filter layer 220. The organic insulating layer 230 can include two organic insulating layers having different refractive indices from each other in order to improve the extraction efficiency of light emitted from a light-emitting element (ED). The organic insulating layer 230 can include a first organic insulating layer (OC1) and a second organic insulating layer (OC2).

[0157] The first organic insulating layer (OC1) is provided on the color filter layer 220 and can have a first refractive index. The second organic insulating layer (OC2) is provided on the first organic insulating layer (OC1) and can have a second refractive index. As an example, the second refractive index may be greater than the first refractive index.

[0158] Since the second organic insulating layer (OC2) has a refractive index greater than that of the first organic insulating layer (OC1), the light emitted from the light-emitting element (ED) can be refracted or reflected at the interface between the second organic insulating layer (OC2) and the first organic insulating layer (OC1) to change the optical path. The display panel 110 according to an embodiment of the present specification can improve the light extraction efficiency by the changed optical path.

[0159] In addition, the first organic insulating layer (OC1) and the second organic insulating layer (OC2) can have inclined surfaces in the regions between the sub-pixels (SP1, SP2, SP3).

[0160] Specifically, in the first organic insulating layer (OC1), a first flat surface (S11) is formed in a region overlapping each of the sub-pixels (SP1, SP2, SP3), and a first concave portion (CV1) formed in a concave shape toward the first substrate 111 can be formed in a region between the sub-pixels (SP1, SP2, SP3). The first concave portion (CV1) of the first organic insulating layer (OC1) can be formed to cover the color filters (CF1, CF2) as shown in FIG. 10. The first concave portion (CV1) of the first organic insulating layer (OC1) can form a second flat surface (S13) and a first inclined surface (S12) having a height lower than that of the first flat surface (S11). That is, the first organic insulating layer (OC1) is continuously arranged across adjacent sub-pixels, and the color filter is covered by both the first organic insulating layer (OC1) and the second organic insulating layer (OC2), so that the sub-pixels can be better protected from outgassing (for example, the thin portion of the first organic insulating layer (OC1) can extend across the region between adjacent sub-pixels). The first inclined surface (S12) can be arranged on at least one side of the second flat surface (S13) and can be a surface connecting the first flat surface (S11) and the second flat surface (S13). In FIG. 10, it is illustrated that the second flat surface (S13) is formed in the first concave portion (CV1), but it is not necessarily limited thereto. The second flat surface (S13) of the first concave portion (CV1) of the first organic insulating layer (OC1) can also be omitted depending on the separation distance between the sub-pixels (SP1, SP2, SP3) or the viscosity of the organic substance forming the first organic insulating layer (OC1). Alternatively, the second flat surface (S13) of the first concave portion (CV1) of the first organic insulating layer (OC1) may not be a flat surface (for example, it may be a sharp concave portion, a textured surface, a wavy or bent surface, etc.).

[0161] The first inclined surface (S12) can have a high first inclination angle (θ1). In one embodiment, the first inclination angle (θ1) can be 70° or more.

[0162] Since the first organic insulating layer (OC1) has a first slope (S12) with a high first slope angle (θ1), it can have a relatively thick first thickness (T1). The first organic insulating layer (OC1) can be made of an organic material. The thickness and planarization characteristics of the organic material can vary depending on the viscosity. The first organic insulating layer (OC1) can be made of an organic material having a high first viscosity. As an example, the first organic insulating layer (OC1) can be made of photoacrylic (PAC). The first organic insulating layer (OC1) has a thick first thickness (T1) compared to the second organic insulating layer (OC2) and can planarize the surface uniformly.

[0163] According to another embodiment of the present specification, in the display panel 110, since the first slope (S12) of the first organic insulating layer (OC1) has a high first slope angle (θ1), the separation distance between the sub-pixels (SP1, SP2, SP3) can be shortened, and the sub-pixels can be arranged closer to each other.

[0164] In the second organic insulating layer (OC2), a first flat surface (S21) can be formed in a region overlapping each of the sub-pixels (SP1, SP2, SP3), and a second concave portion (CV2) formed in a concave shape toward the first substrate 111 can be formed in a region between the sub-pixels (SP1, SP2, SP3).

[0165] As shown in FIG. 10, the second recess (CV2) of the second organic insulating layer (OC2) can at least partially overlap with the first recess (CV1) of the first organic insulating layer (OC1). The second recess (CV2) of the second organic insulating layer (OC2) can form a second flat surface (S23) and a second inclined surface (S22) having a height lower than that of the first flat surface (S21). The second inclined surface (S22) is disposed on at least one side of the second flat surface (S23) and can be a surface connecting the first flat surface (S21) and the second flat surface (S23). The second inclined surface (S22) can at least partially overlap with the first inclined surface (S12) of the first organic insulating layer (OC1). In FIG. 10, it is illustrated that the second flat surface (S23) is formed in the second recess (CV2), but it is not necessarily limited thereto. The second recess (CV2) of the second organic insulating layer (OC2) can also omit the second flat surface (S23) depending on the separation distance between the sub-pixels (SP1, SP2, SP3) or the viscosity of the organic material forming the second organic insulating layer (OC2). Alternatively, the second flat surface (S23) of the second recess (CV2) of the second organic insulating layer (OC2) may not be a flat surface.

[0166] The second inclined surface (S22) of the second organic insulating layer (OC2) can have a second inclination angle (θ2) lower than the first inclination angle (θ1) of the first organic insulating layer (OC1). In one embodiment, the second inclination angle (θ2) can be 45° or less.

[0167] Since the second organic insulating layer (OC2) has a second inclination surface (S22) with a low or gentle second inclination angle (θ2), it can have a relatively thin second thickness (T2). When the second thickness (T2) of the second organic insulating layer (OC2) is large, the horizontal distance of the second inclination surface (S22) of the second organic insulating layer (OC2) can become long in order to form the second inclination angle (θ2) at 45° or less. As the horizontal distance of the second inclination surface (S22) of the second organic insulating layer (OC2) becomes long, the separation distance between the sub-pixels (SP1, SP2, SP3) can become large. Thereby, the aperture ratio of the display panel 110 can decrease. The display panel 110 according to another embodiment of the present specification forms the second thickness (T2) of the second organic insulating layer (OC2) to be thin, so that the second inclination surface (S22) of the second organic insulating layer (OC2) can form the second inclination angle (θ2) at 45° or less without increasing the separation distance between the sub-pixels (SP1, SP2, SP3), and the sub-pixels can be arranged closer to each other.

[0168] The second organic insulating layer (OC2) can be made of an organic material. The thickness and planarization characteristics of the organic material can change depending on the viscosity. The second organic insulating layer (OC2) can be made of an organic material having a low second viscosity. As an example, the second organic insulating layer (OC2) can be made of an organic material such as polyimide (PI) or siloxane. The second organic insulating layer (OC2) has a second thickness (T2) thinner than that of the first organic insulating layer (OC1), and planarization can be prevented from being performed well in the second concave portion (CV2). Thereby, the second organic insulating layer (OC2) can sufficiently secure the area of the second inclination surface (S22) in the second concave portion (CV2).

[0169] The display panel 110 according to another embodiment of the present specification can be formed so as to completely cover the color filters (CF1, CF2) even in the regions between adjacent sub-pixels where the first organic insulating layer (OC1) with good planarization characteristics is adjacent. Thus, the display panel 110 according to another embodiment of the present specification cannot always completely cover the color filters (CF1, CF2) with the second organic insulating layer (OC2) having relatively poor planarization characteristics, but the first organic insulating layer (OC1) can ensure sufficient covering power, so that it is possible to reliably prevent gas from moving to the light-emitting element (ED) due to out-gassing. That is, when a part of the second organic insulating layer (OC2) is interrupted between adjacent sub-pixels, the first organic insulating layer (OC1) can provide a kind of backup coverage for preventing out-gassing.

[0170] As described above, the embodiments of the present invention have been described in more detail with reference to the attached drawings. However, the present invention is not necessarily limited to such embodiments, and can be variously modified and implemented within the scope not departing from the technical idea of the present invention. Therefore, the embodiments disclosed in the present invention are not for limiting the technical idea of the present invention but for explaining it, and the scope of the technical idea of the present invention is not limited by such embodiments. Therefore, it must be understood that the above-described embodiments are illustrative in all respects and not restrictive. The protection scope of the present invention must be interpreted by the scope of the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the rights of the present invention.

Description of Reference Numerals

[0171] 100: Display device 110: Display panel 120: Gate driver 122: Scan driver 124: Light emission control driver 130: Data driver 131: Data drive IC 140: Circuit film 160: Timing controller 180: Power supply circuit 210: Circuit element layer 220: Color filter layer 230: Organic insulating layer OC1: First organic insulating layer CV1: First recess OC2: Second organic insulating layer CV2: Second recess 240: Light-emitting element layer ED: Light-emitting element E1: First electrode EL: Light-emitting layer E2: Second electrode 250: Encapsulation layer

Claims

1. a first sub-pixel and a second sub-pixel disposed adjacent to each other on the substrate, each sub-pixel including a first electrode, a light-emitting layer, and a second electrode; a first insulating layer disposed between the light emitting layer and the substrate, the first insulating layer including a first recess disposed between the first light emitting region of the first sub-pixel and the second light emitting region of the second sub-pixel; and a second insulating layer disposed between the light emitting layer and the first insulating layer, the second insulating layer including a second recess disposed between the first light emitting region and the second light emitting region; the second electrode extends across the second recess in the second insulating layer; a portion of the second electrode is disposed in the second recess; A display panel, wherein a portion of the second electrode is located closer to the substrate than the first electrode of the first subpixel and the first electrode of the second subpixel, or closer to the substrate than the top surface of the first insulating layer.

2. a color filter layer disposed on at least one of the first sub-pixel and the second sub-pixel; The display panel of claim 1 , wherein the first insulating layer includes an open area that exposes at least a portion of the color filter layer.

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

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

5. 2. The display panel of claim 1, wherein a first thickness of the first insulating layer in a region overlapping the first light-emitting region or the second light-emitting region is thicker than a second thickness of the second insulating layer in a region overlapping the first light-emitting region or the second light-emitting region.

6. the second insulating layer has a third thickness corresponding to a center of the second recess; The display panel of claim 5 , wherein the third thickness is equal to or less than the second thickness.

7. the first insulating layer includes a first inclined surface corresponding to the first recess; the second insulating layer includes a second inclined surface corresponding to the second recess; The display panel of claim 1 , wherein the first inclined surface is steeper than the second inclined surface.

8. the light-emitting layer extends across both the first sub-pixel and the second sub-pixel; the light emitting layer includes a third inclined surface corresponding to the second inclined surface of the second insulating layer, the second electrode includes a fourth inclined surface corresponding to the third inclined surface of the light emitting layer; The display panel of claim 7 , wherein 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.

9. The display panel of claim 1 , wherein a bottom portion of the second electrode between the first subpixel and the second subpixel is disposed 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 an opening region corresponding to the first recess, the opening region being a hole penetrating both opposing side surfaces of the first insulating layer.

11. The display panel of claim 1 , further comprising a bank disposed on an edge of the first electrode of the first subpixel and an edge of the first electrode of the second subpixel.

12. 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; 2. The display panel of claim 1, wherein the first insulating layer includes a first planar surface overlapping at least one of the first light-emitting region and the second light-emitting region, and a second planar surface overlapping the non-light-emitting region between the first subpixel and the second subpixel, the second planar surface being positioned closer to the substrate than the first planar surface.

13. The display panel of claim 1 , wherein the cross section of the second electrode has a "V" shape or a "U" shape in a non-emitting region between the first subpixel and the second subpixel.

14. the light-emitting layer extends across both the first sub-pixel and the second sub-pixel; In the first sub-pixel, an outer edge of the first electrode facing the first recess and the second recess directly contacts the light-emitting layer; The display panel of claim 1 , wherein in the second sub-pixel, an outer edge of the first electrode facing the first recess and the second recess directly contacts the light-emitting layer.

15. the first inclined surface of the first insulating layer has an inclination of 70 degrees or more; The display panel of claim 1 , wherein the second inclined surface of the second insulating layer has an inclination of 45 degrees or less.

16. a first organic insulating layer disposed on the substrate, the first organic insulating layer including a first inclined surface 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 including a second inclined surface 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 elements disposed on the second organic insulating layer in the first sub-pixel and the second sub-pixel, A display device, wherein the second inclined surface of the second organic insulating layer has a smaller inclination than the first inclined surface of the first organic insulating layer.

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

18. 17. The display device of 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 an inclination of 70 degrees or more.

20. The display device according to claim 16 , wherein the second inclined surface of the second organic insulating layer has an inclination of 45 degrees or less.

21. The display device of 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 first organic insulating layer includes an opening region between the first sub-pixel and the second sub-pixel; The display device according to claim 16 , wherein the second organic insulating layer covers the open region 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 with the first sub-pixel.

24. 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; The display device of claim 16 , wherein the first angled surface connects the first planar surface to the second planar surface.

25. The display device of claim 16, further comprising a plurality of color filters disposed between the substrate and the first organic insulating layer, the color filters being disposed in the first sub-pixel and the second sub-pixel, respectively.

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

27. 26. The display of claim 25, wherein the plurality of color filters at least partially overlap one another between the first sub-pixel and the second sub-pixel.

28. Each of the plurality of light-emitting elements is a first electrode on the second organic insulating layer; a light-emitting layer overlying the first electrode; and a second electrode overlying the light-emitting layer; The display device according to claim 16 , wherein the second electrode is a reflective electrode.

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

30. 29. The display device of claim 28, wherein the second electrode extends continuously between the first subpixel and the second subpixel across the first subpixel and the second subpixel, and the second electrode extends along the second inclined surface of the second organic insulating layer between the first subpixel and the second subpixel.

31. The display device according to claim 28 , further comprising a bank disposed on the first electrode so as to cover an edge of the first electrode.

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