Display device

Abstract

A display device includes: a plurality of first electrodes and contact electrodes on a substrate; a plurality of light emitting elements on the plurality of first electrodes; a first optical layer between the plurality of light emitting elements; and a second electrode on the plurality of light emitting elements, the second electrode including a first region on the plurality of light emitting elements and a second region extending beyond an end portion of the first optical layer and in contact with the contact electrode.

Description

Technical Field

[0001] The present disclosure relates to a display device, and particularly to, for example but not limited to, a display device using an inorganic light emitting diode as a light emitting element. Background Art

[0002] The electroluminescent display device includes an organic light emitting display device in which an organic light emitting diode (OLED) is provided and an inorganic light emitting display device (hereinafter referred to as "LED display device") in which an inorganic light emitting diode (hereinafter referred to as "LED") is provided.

[0003] The electroluminescent display device displays images using a self-luminous element, and thus does not require a separate light source (eg, a backlight unit), and can be thinned and implemented in various forms.

[0004] In the organic light emitting display device, an oxidation phenomenon between an organic light emitting layer and an electrode may occur due to the penetration of moisture and oxygen, and thus a design for preventing or reducing the penetration of oxygen and moisture is required.

[0005] Recently, as an example of an inorganic light-emitting display device, a micro LED display device in which a micro LED is arranged in a pixel has attracted much attention as a next-generation display device. The micro LED may be an inorganic LED having a size of 100 μm or less. The micro LED is manufactured by a separate semiconductor process and transferred to a pixel position on a display panel substrate of the display device, so that it can be arranged in sub-pixels of each color, respectively. Summary of the invention

[0006] In the related art, each micro LED may be connected to an anode electrode and a cathode electrode to receive power. However, the inventors of the present disclosure newly recognized that a step is generated in the process of connecting the cathode electrode to a low potential voltage and stress is concentrated at the portion where the step is generated, thereby causing cracks.

[0007] Therefore, the inventors of the present disclosure recognized the above-mentioned problems and other limitations associated with the related art and conducted various experiments to realize a display panel capable of preventing or reducing the occurrence of cracks in a cathode electrode and a display device including the display panel.

[0008] Other features and aspects of the present disclosure are partially set forth in the following description, and in part will become apparent from the description, or may be learned by practicing the inventive concepts provided herein. Other features and aspects of the inventive concepts may be realized and obtained by structures pointed out or derived therefrom in the present disclosure, as well as the attached claims and drawings.

[0009] To achieve these and other aspects of the inventive concepts, as embodied and broadly described herein, a display device includes: a substrate; a plurality of first electrodes on the substrate; a contact electrode on the substrate; a plurality of light-emitting elements on the plurality of first electrodes; a first optical layer between the plurality of light-emitting elements; and a second electrode on the plurality of light-emitting elements, the second electrode including a first region on the plurality of light-emitting elements and a second region extending beyond an end of the first optical layer and in contact with the contact electrode.

[0010] In one embodiment, a display device includes: a substrate; a plurality of first electrodes on the substrate; a plurality of light-emitting elements on the plurality of first electrodes; a first optical layer between the plurality of light-emitting elements; a second electrode on the plurality of light-emitting elements, the second electrode including a first region on the plurality of light-emitting elements and a second region extending beyond an end of the first optical layer; and a second optical layer surrounding the first optical layer, the second optical layer being on the second region of the second electrode.

[0011] In one embodiment, a display device includes: a substrate; a first electrode on the substrate; a contact electrode, which is on the substrate and includes a portion extending in a first direction, the contact electrode is configured to provide a voltage; a light-emitting element on the first electrode; a first optical layer surrounding the light-emitting element; and a second electrode configured to provide a voltage from the contact electrode to the light-emitting element, the second electrode including a first portion connected to the light-emitting element and extending in the first direction and a second portion extending in the first direction and contacting the portion of the contact electrode extending in the first direction, wherein the first optical layer is not above the second portion of the second electrode.

[0012] According to example embodiments of the present disclosure, it is possible to prevent or reduce the occurrence of cracks in a cathode electrode.

[0013] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the inventive concepts as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which may be included to provide a further understanding of the disclosure and may be incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain various principles of the disclosure.

[0015] The above and other aspects, features and advantages of the present disclosure will become more apparent to those skilled in the art by describing in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0016] Figure 1 is a diagram illustrating a display device according to an exemplary embodiment of the present specification;

[0017] Figure 2 is an example embodiment according to the present specification. Figure 1 An enlarged view of area A in FIG.

[0018] Figure 3 is a diagram illustrating a partial area of ​​a pixel according to an example embodiment of the present specification;

[0019] Figure 4 According to an exemplary embodiment of the present specification, Figure 3 A cross-sectional view taken along line II′ in FIG.

[0020] Figure 5 According to an exemplary embodiment of the present specification, Figure 3 A cross-sectional view taken along line II-II′;

[0021] Figure 6 According to an exemplary embodiment of the present specification, Figure 3 A cross-sectional view taken along line III-III′ in FIG.

[0022] Figure 7 is a cross-sectional view illustrating an example in which a main light emitting element and a sub light emitting element are electrically connected to a pixel driving circuit according to an exemplary embodiment of the present specification;

[0023] Figure 8 is a diagram illustrating a display device according to another example embodiment of the present specification;

[0024] Fig. 9 According to an exemplary embodiment of the present specification, Figure 8 A cross-sectional view taken along line IV-IV′;

[0025] Fig.10 is a diagram illustrating a state in which stress is concentrated in the second electrode provided in the through hole;

[0026] Fig.11 According to an example implementation of this specification Figure 8 A first variation of;

[0027] Fig.12 According to an example implementation of this specification Figure 8 A second variation of ; and

[0028] FIG. 13A to FIG. 13F is a diagram illustrating a method of manufacturing a display device according to an example embodiment of the present specification.

[0029] Throughout the drawings and detailed description, unless otherwise described, the same drawing reference numerals should be understood to refer to the same elements, features, and structures.The size, length, and thickness of layers, regions, and elements and their illustrations may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0030] Reference will now be made in detail to embodiments of the present disclosure, examples of which may be illustrated in the accompanying drawings. In the following description, when a detailed description of a well-known function or configuration associated with this document is determined to be unnecessary to obscure the gist of the inventive concept, its detailed description will be omitted. The described progression of processing steps and / or operations is an example; however, the order of steps and / or operations is not limited to the order set forth herein, and may be changed as known in the art, except for steps and / or operations that must occur in a particular order. Similar reference numerals designate similar elements throughout the text. The names of the corresponding elements used in the following description may be selected only for the convenience of writing the specification, and therefore may be different from the names used in the actual product.

[0031] The advantages and features of the present disclosure and methods for achieving them will become clear with reference to the following example embodiments described in detail in conjunction with the accompanying drawings. The present disclosure is not limited to the embodiments to be described below and may be implemented in different forms, which are provided only to fully disclose the present disclosure and fully convey the scope of the present disclosure to those skilled in the art, and the present disclosure is limited by the scope of the appended claims. Any implementation described herein is not necessarily to be interpreted as being preferred or advantageous over other implementations.

[0032] Since the shapes, sizes, proportions, angles, quantities, etc. disclosed in the drawings used to describe the example embodiments of the present disclosure are only examples, the present disclosure is not limited to the items shown in the drawings. Throughout the specification, the same reference numerals refer to substantially the same components. In addition, when describing the present disclosure, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present disclosure, its detailed description will be omitted or briefly provided.

[0033] When terms such as "setting", "including", "having", "comprising", etc. mentioned in this specification are used, other parts may be added unless terms such as "only" are used. Components expressed in the singular form may also be interpreted as plural forms unless explicitly stated otherwise.

[0034] When describing components, it should be understood that error ranges are included even if there is no separate explicit description.

[0035] When describing the positional relationship and interconnection relationship between two components, such as "on", "upper", "lower", "beside", "connected or coupled", "crossing or intersecting", etc., one or more other components may be inserted between the components, unless more restrictive terms such as "immediately next to" or "directly" are used.

[0036] When a temporal relationship is described as "after," "next," "then," "before," etc., the temporal relationship may not be continuous on the timeline unless more restrictive terms such as "only," "immediately," or "directly" are used.

[0037] When describing the elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)", "(b)", etc. may be used before the component names to distinguish the components, but the function, structure, essence, sequence, order or quantity of the corresponding components are not limited by these ordinal numbers or component names. For ease of description, the ordinal numbers before the same component names may be different between embodiments. In addition, when an element or layer is described as being "connected", "coupled" or "adhered" to another element or layer, the element or layer may not only be directly connected or adhered to the other element or layer, but also be indirectly connected or adhered to the other element or layer, and one or more intermediate elements or layers are "disposed" between the elements or layers, unless otherwise specified.

[0038] The term "at least one" should be understood to include any and all combinations of one or more associated listed items. For example, the meaning of "at least one of a first element, a second element, and a third element" covers the combination of all three listed elements, the combination of any two of the three elements, and each individual element, the first element, the second element, or the third element.

[0039] The features of the various embodiments of the present disclosure may be partially or completely connected or combined with each other, and may interoperate with each other in various ways and be driven technically, as can be fully understood by those skilled in the art. The embodiments of the present disclosure may be implemented independently of each other, or may be implemented together in a related dependency relationship.

[0040] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the example embodiments belong. It will also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having, for example, a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined as such herein. For example, the term "component" or "unit" may apply, for example, to a separate circuit or structure, an integrated circuit, a computing block of a circuit device, or any structure configured to perform the described function, as will be understood by one of ordinary skill in the art.

[0041] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, all components of each display device according to all embodiments of the present disclosure are operatively connected and configured.

[0042] A display device according to an example embodiment of the present specification includes a display area for displaying an image or a display panel on which a screen is arranged, and a pixel driving circuit for driving pixels of the display panel. The display area includes a pixel area on which pixels are arranged. The pixel area includes a plurality of light-emitting areas. Light-emitting elements are arranged in each light-emitting area. The pixel driving circuit can be built into the display panel.

[0043] Figure 1 is a diagram illustrating a display device according to an example embodiment of the present specification. Figure 2 This is an example of an embodiment according to Figure 1 Magnified view of area A in FIG. Figure 3 is a diagram illustrating a partial area of ​​a pixel according to one embodiment.

[0044] Reference Figure 1 and Figure 2 , a display device 100 according to an example embodiment of the present specification includes a display panel that visually reproduces an input image. The display panel may include a display area AA that displays an image and a non-display area NA that does not display an image. The non-display area NA may be adjacent to the display area AA, for example, may be disposed around the display area AA. In the non-display area NA, various lines and driving circuits may be installed, and a pad portion PAD that connects an integrated circuit, a printed circuit, etc. may be disposed.

[0045] The plurality of light emitting elements 10 disposed in the display area AA and forming the pixels PXL may be micro-sized inorganic light emitting elements. The inorganic light emitting elements may be grown on a silicon wafer and then attached to the display panel through a transfer process.

[0046] The transfer process of the light emitting element 10 may be performed for each pre-divided region. Figure 1 , an example in which the display area AA is divided into nine transfer areas ST is described, but the size or number of the divided transfer areas is not limited thereto. The transfer process may be performed sequentially or simultaneously on the first to ninth transfer areas ST. The blue light emitting element 10, the green light emitting element 10, and the red light emitting element 10 may be sequentially transferred to the respective transfer areas ST.

[0047] In the non-display area NA, a data drive circuit or a gate drive circuit may be provided, and a line for providing a control signal for controlling these drive circuits may be provided. Here, the control signal may include various timing signals, including a clock signal, an input data enable signal, and a synchronization signal, and the control signal may be received through the pad portion PAD. However, the present disclosure is not limited thereto. For example, at least one of the data drive circuit and the gate drive circuit may be provided on the lower surface of the display panel and connected to the pixels in the display area AA through the PAD portion, thereby reducing or minimizing the size or area of ​​the non-display area NA. In another example, the gate drive circuit may be integrated in the display area AA.

[0048] The pixel PXL can be driven by a pixel driving circuit. The pixel driving circuit can receive a driving voltage, an image signal (e.g., a digital signal), a synchronization signal synchronized with the image signal, etc., and output an anode voltage and a cathode voltage of the light-emitting element 10 to drive a plurality of pixels. The driving voltage can be a high potential voltage EVDD. The cathode voltage can be a low potential voltage EVSS commonly applied to the pixel. The anode voltage can be a voltage corresponding to the pixel data value of the image signal. The pixel driving circuit can be arranged in the non-display area NA or below the display area AA.

[0049] Each pixel PXL may include a plurality of sub-pixels having different colors. For example, each of the plurality of pixels may include a red sub-pixel provided with a light-emitting element 10 emitting red wavelength light, a green sub-pixel provided with a light-emitting element 10 emitting green wavelength light, and a blue sub-pixel provided with a light-emitting element 10 emitting blue wavelength light. The plurality of pixels may also include a white sub-pixel.

[0050] Reference Figure 2 and Figure 3 , a plurality of pixels PXL may be continuously arranged in a first direction (X-axis direction) and a second direction (Y-axis direction). A plurality of sub-pixels of the same color may be arranged in pixels of the display area AA. For example, each of the plurality of pixels may include: a first red sub-pixel provided with a 1-1 light-emitting element 11a emitting red wavelength light, a second red sub-pixel provided with a 1-2 light-emitting element 11b emitting red wavelength light, a first green sub-pixel provided with a 2-1 light-emitting element 12a emitting green wavelength light, a second green sub-pixel provided with a 2-2 light-emitting element 12b emitting green wavelength light, a first blue sub-pixel provided with a 3-1 light-emitting element 13a emitting blue wavelength light, and a second blue sub-pixel provided with a 3-2 light-emitting element 13b emitting blue wavelength light. The 1-1 light-emitting element 11a, the 2-1 light-emitting element 12a, and the 3-1 light-emitting element 13a may be referred to as a main light-emitting element. The 1-2 light-emitting element 11b, the 2-2 light-emitting element 12b, and the 3-2 light-emitting element 13b may be referred to as a sub-light-emitting element or a redundant light-emitting element.

[0051] One sub-pixel may include at least one or more light emitting elements, so when one light emitting element becomes defective, the brightness of the sub-pixel may be adjusted by increasing the brightness of other light emitting elements. However, the present disclosure is not necessarily limited thereto, and one sub-pixel may include only one light emitting element.

[0052] A plurality of first electrodes 161 may be respectively disposed under the light emitting element 10, and may be selectively connected to a plurality of signal lines TL1 to TL6 through the connection portion 161a. A high potential voltage may be applied to the pixel driving circuit through the signal lines TL1 to TL6. The signal lines TL1 to TL6 and the first electrodes 161 may be formed as an electrode pattern integrated during an electrode patterning process.

[0053] For example, the first signal line TL1 may be connected to the anode electrode of the first red sub-pixel, and the second signal line TL2 may be connected to the anode electrode of the second red sub-pixel. The third signal line TL3 may be connected to the anode electrode of the first green sub-pixel, and the fourth signal line TL4 may be connected to the anode electrode of the second green sub-pixel. The fifth signal line TL5 may be connected to the anode electrode of the first blue sub-pixel, and the sixth signal line TL6 may be connected to the anode electrode of the second blue sub-pixel. When one sub-pixel includes only one light-emitting element, the number of signal lines TL may be halved.

[0054] The second electrode 170 may be a cathode electrode that is disposed in each row and applies a cathode voltage to the light emitting elements 10 that are continuously disposed in the first direction (X-axis direction). A plurality of second electrodes 170 may be disposed to be spaced apart from each other in the second direction (Y-axis direction). A plurality of second electrodes 170 may receive a cathode voltage through the contact electrode 163. Each of the plurality of second electrodes 170 may be electrically connected to the contact electrode 163. However, the present disclosure is not necessarily limited thereto, and the second electrode 170 may not be divided into a plurality of second electrodes 170, but may be configured as one electrode layer and used as a common electrode.

[0055] Figure 4 According to one embodiment, Figure 3 A cross-sectional view taken along line II′ in FIG. Figure 5 According to one embodiment, Figure 3 A cross-sectional view taken along line II-II′. Figure 6 According to one embodiment, Figure 3 A cross-sectional view taken along line III-III′ in FIG. Figure 7 is a cross-sectional view illustrating an example in which two light emitting elements are connected to a pixel driving circuit according to an embodiment.

[0056] Reference Figures 3 to 5According to the present embodiment, the display device includes: a plurality of first electrodes 161 and a contact electrode 163 arranged on a substrate 110, a plurality of light emitting elements 10 arranged on the plurality of first electrodes 161, a first optical layer 141 arranged between the plurality of light emitting elements 10, and a second electrode 170 arranged on the plurality of light emitting elements 10.

[0057] The substrate 110 may include plastic having flexibility. For example, the substrate 110 may be manufactured as a single-layer or multi-layer substrate made of a material selected from the following: polyimide, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyether sulfone, polyarylate, polysulfone, and cyclic olefin copolymer, but is not limited thereto. For example, the substrate 110 may be a ceramic substrate or a glass substrate.

[0058] The pixel driving circuit 20 may be disposed in the display area AA on the substrate 110. The pixel driving circuit 20 may include a plurality of thin film transistors using an amorphous silicon semiconductor, a polysilicon semiconductor, or an oxide semiconductor as a material of an active layer.

[0059] The pixel driving circuit 20 may include at least one driving thin film transistor, at least one switching thin film transistor, and at least one storage capacitor. When including a plurality of thin film transistors, the pixel driving circuit 20 may be formed on the substrate 110 by a thin film transistor (TFT) manufacturing process. In the present embodiment, the pixel driving circuit 20 may be a concept collectively referred to as a plurality of thin film transistors electrically connected to the light emitting element 10.

[0060] The pixel driving circuit 20 may be a pixel driver manufactured on a single crystal semiconductor substrate 110 using a metal-oxide-silicon field effect transistor (MOSFET) manufacturing process. The pixel driver may include a plurality of pixel driving circuits to drive a plurality of sub-pixels. When the pixel driving circuit 20 is implemented as a pixel driver, after an adhesive layer is provided on the substrate 110, the pixel driver may be mounted on the adhesive layer by a transfer process.

[0061] A buffer layer 121 covering the pixel driving circuit 20 may be disposed on the substrate 110. The buffer layer 121 may include an organic insulating material such as photosensitive photoacrylic or photosensitive polyimide, but is not limited thereto.

[0062] The inorganic insulating material (e.g., silicon nitride (SiN x ), silicon oxide (SiO 2 ), etc.), or the buffer layer 121 is used by stacking an organic insulating material and an inorganic insulating material in a multilayer manner.

[0063] The insulating layer 122 may be disposed on the buffer layer 121. The insulating layer 122 may include an organic insulating material (e.g., photosensitive photoacrylic or photosensitive polyimide), but is not limited thereto. The connecting wires RT1 and RT2 may be disposed on the buffer layer 121. The connecting wires RT1 and RT2 may be connected to the corresponding signal wires TL1 to TL6, or may be connected to the signal wires TL1 to TL6. The connecting wires RT1 and RT2 may include a plurality of line patterns disposed on different layers, and one or more insulating layers are interposed therebetween. The line patterns disposed on different layers may be electrically connected through contact holes passing through the insulating layers.

[0064] A plurality of bank patterns 130 may be disposed on the insulating layer 122. At least one light emitting element 10 may be disposed on the upper surface of each bank pattern 130. For example, the first light emitting element 11 may be disposed on the first bank pattern 130, the second light emitting element 12 may be disposed on the second bank pattern 130, and the third light emitting element 13 may be disposed on the third bank pattern 130. Figure 4 As shown, the first electrode 161 is on the upper surface of the bank pattern 130 , so that the first electrode 161 is between the bank pattern 130 and the light emitting element 10 .

[0065] The bank pattern 130 may include an organic insulating material (eg, photosensitive photoacrylic or photosensitive polyimide), but is not limited thereto. The bank pattern 130 may guide the position where the light emitting element 10 is to be attached during the transfer process of the light emitting element 10. The bank pattern 130 may also be omitted.

[0066] The solder pattern 162 may be disposed on the first electrode 161. The solder pattern 162 may include indium (In), tin (Sn) or an alloy thereof, but is not limited thereto. The solder pattern 162 may also be referred to as a conductive connection pattern / layer or a conductive adhesive pattern / layer. However, the present disclosure is not limited thereto, and the solder pattern 162 may be omitted.

[0067] Each of the plurality of light emitting elements 10 may be mounted on the solder pattern 162. One pixel may include three colors of light emitting elements 10. The first light emitting element 11 may be a red light emitting element, the second light emitting element 12 may be a green light emitting element, and the third light emitting element 13 may be a blue light emitting element. Two light emitting elements may be mounted in each sub-pixel.

[0068] The first optical layer 141 may cover the plurality of light emitting elements 10 and the dam pattern 130. Thus, the first optical layer 141 may cover a portion of a space between the plurality of light emitting elements 10 and a space between the plurality of dam patterns 130. The first optical layer 141 may extend in the first direction (X) and may be spaced apart in the second direction (Y) to be separated between pixel rows.

[0069] The first optical layer 141 may include an organic insulating material in which light scattering particles (eg, but not limited to, fine metal particles such as titanium dioxide particles) are dispersed. Light emitted from the plurality of light emitting elements 10 may be scattered by the fine metal particles dispersed in the first optical layer 141 and emitted to the outside.

[0070] The second electrode 170 may be disposed on the plurality of light emitting elements 10. The second electrode 170 may be commonly connected to the plurality of pixels PXL. That is, the second electrode may be connected to the plurality of pixels PXL. The second electrode 170 may be a light-transmitting thin electrode. The second electrode 170 may include a transparent electrode material, such as indium tin oxide (ITO), but is not necessarily limited thereto.

[0071] The second electrode 170 may extend in a first direction (X-axis direction) and may be spaced apart in a second direction (Y-axis direction). The second electrode 170 may include a first region 171 (e.g., a first portion or a first part) disposed on the upper surface of the light emitting element 10 and the upper surface of the first optical layer 141 at a first height relative to the substrate 110, a second region 172 (e.g., a second portion or a second part) at a second height less than the first height relative to the substrate 110 and in contact with a portion of the contact electrode 163 and electrically connected to the contact electrode 163, and a third region 173 (e.g., a third portion or a third part) disposed on a side surface of the first optical layer 141 and connecting the first region 171 and the second region 172. In one embodiment, the third region 173 is inclined relative to the substrate 110. In one embodiment, the first region 171 of the second electrode 170, the second region 172 of the second electrode 170, and a portion of the contact electrode 163 in contact with the second region 172 of the second electrode 170 extend in a first direction (e.g., a horizontal direction). As Figure 4 As shown, the second region 172 of the second electrode 170 extends beyond the end of the third region 173 , so that the first optical layer 141 is not above the second region 172 of the second electrode 170 .

[0072] Each of the plurality of second electrodes 170 may overlap the first optical layer 141 on a plane, and the second region 172 may cover a plane outside the first optical layer 141 .

[0073] The second optical layer 142 may be an organic insulating material surrounding the first optical layer 141. The second optical layer 142 may be disposed on the insulating layer 122 together with the first optical layer 141. The second optical layer 142 may not include fine metal particles within the first optical layer 141. The first optical layer 141 and the second optical layer 142 may include the same material (e.g., siloxane). For example, the first optical layer 141 may be a titanium oxide (TiO x) of siloxane, and the second optical layer 142 may be a siloxane that does not contain titanium oxide (TiO x ) of siloxane. However, the present disclosure is not necessarily limited thereto, and the first optical layer 141 and the second optical layer 142 may be formed of the same material, or may be formed of different materials. That is, the first optical layer 141 includes a first material and the second optical layer 142 includes a second material different from the first material.

[0074] According to the present embodiment, since second region 172 of second electrode 170 is connected to a portion of contact electrode 163 in an overall flat state, excessive stress is not concentrated at the point connected to contact electrode 163. Therefore, it is possible to effectively prevent or reduce the occurrence of cracks in second electrode 170. That is, a portion of contact electrode 163 is extended in the horizontal direction and a portion of second region 172 of second electrode 170 that contacts a portion of contact electrode 163 is also extended in the horizontal direction.

[0075] The second optical layer 142 may cover the second region 172 and the third region 173 of the second electrode 170, so that the third region 173 is between the second optical layer 142 and the first optical layer 141. The upper surface of the second optical layer 142 and the upper surface of the first region 171 of the second electrode 170 may form the same plane. In other words, the upper surface of the second optical layer 142 and the upper surface of the first region 171 of the second electrode 170 may be located at the same level or height and aligned. For example, the first optical layer 141 and the second optical layer 142 may be used as a planarization layer. Therefore, since there is no step on the surface where the black matrix 190 is formed, the pattern of the black matrix 190 can be easily formed on the first optical layer 141 and the second optical layer 142. However, the present disclosure is not necessarily limited thereto, and the upper surfaces of the second optical layer 142 and the second electrode 170 may have different heights.

[0076] The black matrix 190 may be an organic insulating material to which a black pigment is added. The second electrode 170 may be in contact with the contact electrode 163 below the black matrix 190. Transmission holes 191 may be formed between patterns of the black matrix 190, through which light emitted from the light emitting element 10 may be emitted to the outside. The black matrix 190 may improve the problem of mixing of light emitted from adjacent light emitting elements 10 due to the first optical layer 141.

[0077] The capping layer 180 may be an organic insulating material covering the black matrix 190 and the second electrode 170. Figure 3 In the figure, the configuration of the black matrix 190 and the cover layer 180 is omitted.

[0078] The contact electrode 163 is electrically connected to the first connection line RT1 disposed at the lower portion, and the first connection line RT1 may be connected to the pixel driving circuit 20. Therefore, a cathode voltage may be applied to the second electrode 170 through the contact electrode 163. The first electrode 161 may be electrically connected to the second connection line RT2. This will be described below.

[0079] Reference Figure 5 , the contact electrode 163 and the signal lines TL1 to TL6 may be disposed on the same plane. The pixel driving circuit 20 may be disposed below the contact electrode 163 and the signal lines TL1 to TL6. When the pixel driving circuit 20 is a pixel driver, a plurality of pixel drivers may be disposed in the display panel.

[0080] The passivation layer 133 may expose the contact electrode 163 so that the contact electrode 163 and the second electrode 170 may be electrically connected. In addition, the passivation layer 133 may insulate the signal lines TL2 to TL5 and the second electrode 170 .

[0081] Reference Figure 6 The connection portion 161 a of the first electrode 161 may extend to one side surface 131 of the bank pattern 130 and may be electrically connected to a connection line RT2 disposed on the insulating layer 122 .

[0082] The first electrode 161, the connection portion 161a, the signal line TL and / or the connection lines RT1 and RT2 may include a single layer or multiple layers of metal selected from titanium (Ti), molybdenum (Mo) and aluminum (Al). The first electrode 161, the connection portion 161a, the signal line TL and / or the connection lines RT1 and RT2 may be formed into a multilayer structure including a first layer ML1, a second layer ML2, a third layer ML3 and a fourth layer ML4, and more or less layers may be included in the multilayer structure.

[0083] The first layer ML1 and the third layer ML3 may include titanium (Ti) or molybdenum (Mo). The second layer ML2 may include aluminum (Al). The fourth layer ML4 may include a transparent conductive oxide layer having excellent adhesion to the solder pattern 162 and being corrosion-resistant and acid-resistant, such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0084] The first layer ML1 , the second layer ML2 , the third layer ML3 , and the fourth layer ML4 may be sequentially deposited and may then be patterned by performing a photolithography process and an etching process.

[0085] The passivation layer 133 may be disposed on the first electrode 161 and the signal line TL, and include an opening hole 133 a exposing the solder pattern 162 .

[0086] The light emitting element 10 may include a first conductive type semiconductor layer 10-1, an active layer 10-2 disposed on the first conductive type semiconductor layer 10-1, and a second conductive type semiconductor layer 10-3 disposed on the active layer 10-2. The first driving electrode 15 may be disposed under the first conductive type semiconductor layer 10-1, and the second driving electrode 14 may be disposed on the second conductive type semiconductor layer 10-3.

[0087] The light emitting element 10 can be formed on a silicon wafer using methods such as metal organic chemical vapor deposition (MOCVD), chemical vapor deposition (CVD), plasma enhanced chemical vapor deposition (PECVD), molecular beam epitaxy (MBE), hydride vapor phase epitaxy (HVPE), sputtering, etc.

[0088] The first conductive type semiconductor layer 10-1 may be implemented with a compound semiconductor of group III-V, group II-VI, etc., and may be doped with a first dopant. The first conductive type semiconductor layer 10-1 may be formed of any one of semiconductor materials having the following chemical formula: Al x1 In y1 Ga (1-x1-y1) The first conductive type semiconductor layer 10-1 may be a semiconductor material of, but not limited to, N (0<=x1<=1, 0<=y1<=1, and 0<=x1+y1<=1), InAlGaN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP. When the first dopant is an n-type dopant such as Si, Ge, Sn, Se, Te, etc., the first conductive type semiconductor layer 10-1 may be an n-type nitride semiconductor layer. However, when the first dopant is a p-type dopant, the first conductive type semiconductor layer 10-1 may be a p-type nitride semiconductor layer.

[0089] The active layer 10-2 is a layer where electrons (or holes) injected through the first conductive type semiconductor layer 10-1 and holes (or electrons) injected through the second conductive type semiconductor layer 10-3 meet. When the electrons and holes are recombined in the active layer 10-2, the electrons transition to a low energy level and light having a wavelength corresponding thereto may be generated.

[0090] The active layer 10-2 may have a single well structure, a multi-well structure, a single quantum well structure, a multi-quantum well (MQW) structure, a quantum dot structure, and a quantum wire structure, but the structure of the active layer 10-2 is not limited thereto. The active layer 10-2 may generate light in the visible light band. For example, the active layer 10-2 may output any one of the blue, green, and red bands.

[0091] The second conductive type semiconductor layer 10-3 may be disposed on the active layer 10-2. The second conductive type semiconductor layer 10-3 may be implemented with a compound semiconductor of group III-V, group II-VI, etc., and may be doped with a second dopant. The second conductive type semiconductor layer 10-3 may be formed of any one selected from semiconductor materials having the following chemical formula: In x2 Al y2 Ga 1-x2-y2 N (0 <= x2 <= 1, 0 <= y2 <= 1, and 0 <= x2 + y2 <= 1), AlInN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP, but not limited thereto. When the second dopant is a p-type dopant (such as Mg, Zn, Ca, Sr, Ba, etc.), the second conductive type semiconductor layer 10-3 may be a p-type semiconductor layer. However, when the second dopant is an n-type dopant, the second conductive type semiconductor layer 10-3 may be an n-type nitride semiconductor layer.

[0092] The reflective layer 16 may be disposed on the side surface and the lower portion of the light emitting element 10. The reflective layer 16 may have a structure in which a reflective material is dispersed in a resin layer, but is not necessarily limited thereto. For example, the reflective layer 16 may be manufactured into a reflector of various structures. Since the light emitted from the active layer 10-2 is reflected upward by the reflective layer 16, the light extraction efficiency may be improved.

[0093] In the embodiment, although a vertical structure in which the driving electrodes 14 and 15 are arranged above and below the light emitting structure is described, the present disclosure is not limited thereto, and in addition to the vertical structure, the light emitting element may also have a lateral structure or a flip chip structure. Therefore, when the light emitting element is implemented with a lateral structure, the driving electrodes 14 and 15 may also be arranged on the same side of the light emitting structure.

[0094] Reference Figure 7 , the main light emitting element 12a and the sub light emitting element 12b of the sub-pixel may be disposed on the bank pattern 130. The second light emitting element 12 will be described as an example. The 1-1 electrode 161-1 connected to the main light emitting element 12a extends to one side surface of the bank pattern 130 to be electrically connected to the 2-1 connection line RT21 disposed at the lower portion. The 1-2 electrode 161-2 connected to the sub light emitting element 12b may extend to the other side surface of the bank pattern 130 to be electrically connected to the 2-2 connection line RT22 disposed at the lower portion.

[0095] The pixel driving circuit 20 may apply an anode voltage to the main light emitting element 12a through the 2-1 connection line RT21, and apply an anode voltage to the sub light emitting element 12b through the 2-2 connection line RT22. The pixel driving circuit 20 may apply a cathode voltage to the main light emitting element 12a and the sub light emitting element 12b through the first connection line RT1 and the second electrode 170.

[0096] The pixel driving circuit 20 can control the brightness by driving the main light emitting element 12a without driving the sub-light emitting element 12b, or can control the brightness by driving the main light emitting element 12a and the sub-light emitting element 12b at the same time. When the main light emitting element 12a becomes dark, the brightness can be adjusted by driving only the sub-light emitting element 12b.

[0097] Figure 8 is a diagram illustrating a display device according to another embodiment of the present specification. Fig. 9 According to one embodiment, Figure 8 A cross-sectional view taken along line IV-IV′. Fig.10 is a diagram illustrating a state in which stress is concentrated in a second electrode provided in a through hole according to one embodiment.

[0098] Reference Figure 8 and Fig. 9 , the second electrode 170 may be electrically connected to the contact electrode 163 through the contact hole TH1 formed in the second optical layer 142. The second optical layer 142 may include a contact hole TH1 exposing the contact electrode 163. The second electrode 170 may be inserted into the contact hole TH1 of the second optical layer 142 and contact the upper surface of the contact electrode 163. The contact hole TH1 may be formed in an outer region of the pixel.

[0099] Reference Fig.10 Since the thickness of the second electrode 170 is relatively thin and the contact hole TH1 is formed deeper than the thickness of the second electrode 170, a stress concentration region BP1 may be generated in a local region 170a formed on a side surface portion of the contact hole TH1 of the second electrode 170. Therefore, there is a risk of cracks occurring in the local region 170a of the second electrode 170 formed around the contact hole TH1.

[0100] However, when the second electrode 170 extends flatly instead of Figure 4 When the contact hole TH1 is formed and connected to the contact electrode 163, it is possible to prevent or reduce excessive stress from being applied to the second electrode 170. Therefore, it is possible to prevent or reduce the occurrence of cracks in the second electrode.

[0101] Fig.11 According to one embodiment Figure 8 A first variation of . Fig.12 According to one embodiment Figure 8 A second variation of .

[0102] Reference Fig.11, a separate through electrode 164 may be filled in the contact hole TH1. The through electrode 164 is conductive. The through electrode 164 may include various conductive materials that may be filled in the contact hole TH1. Since the second electrode 170 is disposed on the through electrode 164, it may be formed relatively flat, and the occurrence of excessive stress may be prevented or reduced.

[0103] Reference Fig.12 , the through electrode 164 may not completely fill the contact hole TH1, but may partially fill the through hole TH1 to a certain height. According to this structure, the depth of the second electrode 170 inserted into the contact hole TH1 may be relatively low. Therefore, since the step of the second electrode 170 can be reduced, the possibility of cracks can be reduced.

[0104] FIG. 13A to FIG. 13F This is a diagram illustrating a method for manufacturing a display device according to one embodiment of the present specification.

[0105] Reference Fig.13A , a pixel driving circuit 20 may be formed on the substrate 110, and a buffer layer 121 may be formed on the pixel driving circuit 20. The pixel driving circuit 20 may receive a driving voltage, an image signal (digital signal), a synchronization signal synchronized with the image signal, etc., and output an anode voltage and a cathode voltage of the light emitting element 10 to drive a plurality of pixels. The pixel driving circuit 20 may be disposed in the non-display area NA or below the display area AA.

[0106] Thereafter, the connection wires RT1 and RT2 may be formed on the buffer layer 121, and then the insulating layer 122 may be formed. The connection wires RT1 and RT2 may be electrically connected to the pixel driving circuit 20 through the buffer layer 121. In order to drive each pixel, the number and stacking number of the connection wires RT1 and RT2 may be changed in various ways. Therefore, the stacking number of the connection wires RT1 and RT2 and the insulating layer 122 may be two or more layers.

[0107] A bank pattern 130 may be formed on the insulating layer 122 to select a transfer position of the light emitting element 10. The bank pattern 130 may include an organic insulating material (e.g., photosensitive photoacrylic or photosensitive polyimide), but is not limited thereto. The bank pattern 130 may guide a position to which the light emitting element 10 is to be attached during a transfer process of the light emitting element 10. However, the bank pattern 130 may also be omitted.

[0108] An electrode material may be applied on the insulating layer 122 and the bank pattern 130 and then patterned to form a plurality of first electrodes 161 and a contact electrode 163. The plurality of first electrodes 161 are regions where the light emitting element 10 is disposed, and the contact electrode 163 is a region electrically connected to the second electrode 170. Thereafter, a passivation layer 133 may be formed in the remaining electrode regions except for the regions where the plurality of first electrodes 161 and the contact electrode 163 are formed.

[0109] A solder pattern 162 may be disposed on the first electrode 161. The solder pattern 162 may include indium (In), tin (Sn), or an alloy thereof, but is not limited thereto.

[0110] Reference Fig. 13B , each of the plurality of light emitting elements 10 may be mounted on the solder pattern 162. One pixel may include three colors of light emitting elements 10. The first light emitting element may be a red light emitting element, the second light emitting element may be a green light emitting element, and the third light emitting element may be a blue light emitting element. Two light emitting elements may be mounted in each sub-pixel.

[0111] The transfer method is not particularly limited. For example, the light emitting element 10 grown on the semiconductor growth substrate may be first transferred to a transfer substrate and then secondarily transferred to a panel substrate, or the light emitting element 10 grown on the semiconductor growth substrate may be directly transferred to a panel substrate.

[0112] Reference Fig. 13C and Fig.13D , the first optical layer 141 may be completely formed on the substrate 110, and then patterned so that the upper surfaces of the light emitting element 10 and the contact electrode 163 may be exposed. The remaining portion of the first optical layer 141 except for the region sufficient to cover the light emitting element 10 and the dam pattern 130 may be removed. Therefore, the first optical layer 141 may cover the space between the plurality of light emitting elements 10 and the space between the plurality of dam patterns 130. In this case, the upper surface of the light emitting element 10 may be exposed at the upper portion of the first optical layer 141.

[0113] The first optical layer 141 may include an organic insulating material in which fine metal particles such as titanium dioxide particles are dispersed. Light emitted from the light emitting element 10 may be scattered by the fine metal particles dispersed in the first optical layer 141 and emitted.

[0114] Reference Fig.13E , a second electrode 170 may be provided on a plurality of light emitting elements 10. The second electrode 170 may be connected to a plurality of pixels in common. The second electrode 170 may be a light-transmitting thin metal electrode. The second electrode 170 may be a transparent electrode material (e.g., indium tin oxide (ITO)), but is not necessarily limited thereto.

[0115] The second electrode 170 may be divided to be disposed in each row through patterning. The plurality of divided second electrodes 170 may be electrically connected to the contact electrode 163 .

[0116] Reference Fig.13F , the second optical layer 142 may be formed to surround the first optical layer 141. In this process, the second optical layer 142 may cover a portion of the second electrode 170 connected to the contact electrode 163.

[0117] The second optical layer 142 may be disposed on the insulating layer 122 together with the first optical layer 141. The first optical layer 141 and the second optical layer 142 may include the same material (eg, siloxane). For example, the first optical layer 141 may be a titanium oxide (TiO x ) of siloxane, and the second optical layer 142 may be a siloxane that does not contain titanium oxide (TiO x ) of siloxane.

[0118] Thereafter, a black matrix 190 may be formed on the second electrode 170 and the second optical layer 142 , and a capping layer 180 may be formed on the black matrix 190 .

[0119] The display device according to the embodiments of the present specification can be applied to mobile devices, video phones, smart watches, watch phones, wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, curved devices, sliding devices, variable devices, electronic notebooks, electronic books, portable multimedia players (PMP), personal digital assistants (PDA), MP3 players, mobile medical devices, desktop personal computers (PC), laptop PCs, notebook computers, workstations, navigators, vehicle display devices, theater display devices, televisions, wallpaper devices, signage devices, gaming devices, notebooks, displays, cameras, camcorders, home appliances, etc. In addition, the display device according to one or more embodiments of the present specification can be applied to organic light emitting lighting devices or inorganic light emitting lighting devices.

[0120] A display device according to one or more embodiments of the present specification may be described as follows.

[0121] According to one or more embodiments of the present specification, a display device includes: a plurality of first electrodes and contact electrodes arranged on a substrate; a plurality of light-emitting elements arranged above the contact electrodes; a first optical layer arranged between the plurality of light-emitting elements; and a second electrode arranged on the first optical layer, wherein the plurality of light-emitting elements are electrically connected between the plurality of first electrodes and the second electrode, wherein the second electrode includes a first region arranged on the first optical layer and a second region extending outside the first optical layer and electrically connected to the contact electrode.

[0122] The second region of the second electrode may be flatly formed such that the second region of the second electrode is electrically connected to the contact electrode in a flat form.

[0123] The display device may further include a second optical layer configured to cover the second region of the second electrode.

[0124] An upper surface of the second optical layer and an upper surface of the first region of the second electrode may form the same plane.

[0125] The first optical layer and the second optical layer may be made of different materials.

[0126] The first optical layer may include light scattering particles.

[0127] The display device may further include a plurality of bank patterns disposed under the plurality of light emitting elements.

[0128] The display device may further include a plurality of signal lines extending between the plurality of bank patterns and connected to the plurality of first electrodes.

[0129] The contact electrode may be provided between the plurality of signal lines.

[0130] The display device may further include a passivation layer disposed on the contact electrode and the plurality of signal lines and exposing the contact electrode so that the contact electrode and the second electrode are electrically connected.

[0131] A plurality of second electrodes may be disposed to be spaced apart from each other for each pixel row, and the plurality of second electrodes may be electrically connected to the contact electrode.

[0132] The second electrode may include a third region configured to extend toward a side surface of the first optical layer and connect the first region and the second region.

[0133] The display device may further include: an insulating layer disposed on the substrate; a plurality of connection lines disposed between the substrate and the insulating layer; and a pixel driving circuit connected to the plurality of connection lines, wherein the plurality of connection lines may be electrically connected to the plurality of first electrodes and the contact electrodes, respectively.

[0134] The plurality of light emitting elements may be inorganic light emitting diodes.

[0135] The pixel driving circuit may be a pixel driver.

[0136] The display device may further include: a second optical layer between the second region of the second electrode and the contact electrode; and a through electrode at least partially filling the contact hole of the second optical layer to electrically connect the second region of the second electrode and the contact electrode.

[0137] The through electrode may completely fill the contact hole.

[0138] According to one or more embodiments of the present specification, a display device includes: a plurality of light-emitting elements arranged on a substrate and respectively connected to a plurality of first electrodes; a first optical layer arranged between the plurality of light-emitting elements; a second electrode arranged on the first optical layer; and a second optical layer surrounding the first optical layer, wherein the plurality of light-emitting elements are electrically connected between the plurality of first electrodes and the second electrode, wherein the second electrode includes a first region arranged on the first optical layer and a second region extending outside the first optical layer, and the second optical layer is arranged on the second region of the second electrode.

[0139] The first optical layer and the second optical layer may be made of different materials.

[0140] The first optical layer may include light scattering particles.

[0141] The display device may further include a plurality of bank patterns disposed under the plurality of light emitting elements.

[0142] The display device may further include a plurality of signal lines extending between the plurality of bank patterns and connected to the plurality of first electrodes.

[0143] The display device may include a contact electrode disposed on the substrate and electrically connected to the second electrode; wherein the contact electrode may be disposed between the plurality of signal lines.

[0144] A plurality of second electrodes may be disposed to be spaced apart from each other for each pixel row, and the plurality of second electrodes may be electrically connected to the contact electrode.

[0145] The display device may further include: an insulating layer disposed on the substrate; a plurality of connection lines disposed between the substrate and the insulating layer; and a pixel driving circuit connected to the plurality of connection lines, wherein the plurality of connection lines may be electrically connected to the plurality of first electrodes and the contact electrodes, respectively.

[0146] According to the present invention, cracks in the cathode electrode can be prevented or reduced. Therefore, since the resistance increase of the cathode electrode is improved, low-power driving can be performed.

[0147] The effects of the present specification are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0148] Since the contents of the specification described in the above problems to be solved, means for solving the problems, and effects do not specify essential features of the claims, the scope of the claims is not limited by the items described in the contents of the specification.

[0149] Although the embodiments have been described in more detail with reference to the accompanying drawings, the present disclosure is not necessarily limited to these embodiments, and various modifications can be made without departing from the technical spirit of the present disclosure. Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical spirit of the present disclosure, but to describe the technical concept of the present disclosure, and the scope of the technical concept of the present disclosure is not limited by these embodiments. Therefore, the above-mentioned embodiments should be understood as exemplary and non-restrictive in all aspects.

[0150] CROSS-REFERENCE TO RELATED APPLICATIONS

[0151] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0090571 filed in Korea on Jul. 12, 2023, the disclosure of which is incorporated herein by reference in its entirety.

Claims

1. A display device, comprising: substrate; a plurality of first electrodes, the plurality of first electrodes being on the substrate; a contact electrode, the contact electrode being on the substrate; A plurality of light emitting elements, wherein the plurality of light emitting elements are on the plurality of first electrodes; a first optical layer, the first optical layer being between the plurality of light emitting elements; as well as A second electrode is on the plurality of light emitting elements, the second electrode including a first region on the plurality of light emitting elements and a second region extending to the outside of the first optical layer and contacting the contact electrode.

2. The display device according to claim 1, further comprising: A second optical layer covers the second region of the second electrode.

3. The display device according to claim 2, wherein: The first optical layer includes a first material and the second optical layer includes a second material different from the first material.

4. The display device according to claim 3, wherein: The first optical layer includes light scattering particles.

5. The display device according to claim 1, further comprising: A plurality of bank patterns are provided between the substrate and the plurality of first electrodes, and the plurality of first electrodes are provided on upper surfaces of the plurality of bank patterns.

6. The display device according to claim 5, further comprising: A plurality of signal lines extend between the plurality of bank patterns, the plurality of signal lines being connected to the plurality of first electrodes.

7. The display device according to claim 6, wherein: The contact electrode is between the plurality of signal lines.

8. The display device according to claim 2, further comprising: a plurality of second electrodes, the plurality of second electrodes including the second electrode, the plurality of second electrodes being arranged across a plurality of pixel rows and each of the plurality of second electrodes being spaced apart from each other for each of the plurality of pixel rows, Wherein, the plurality of second electrodes are electrically connected to the contact electrode.

9. The display device according to claim 1, wherein: The second electrode includes a third region on a side surface of the first optical layer, the third region connecting the first region and the second region.

10. The display device according to claim 1, further comprising: an insulating layer, the insulating layer being on the substrate; A plurality of connecting wires, wherein the plurality of connecting wires are between the substrate and the insulating layer; as well as a pixel driving circuit connected to the plurality of connection lines, The plurality of connection lines are electrically connected to the plurality of first electrodes and the contact electrode.

11. The display device according to claim 1, wherein: The plurality of light emitting elements are inorganic light emitting diodes.

12. The display device according to claim 10, wherein: The pixel driving circuit is a driving circuit.

13. A display device, comprising: substrate; a plurality of first electrodes, the plurality of first electrodes being on the substrate; A plurality of light emitting elements, wherein the plurality of light emitting elements are on the plurality of first electrodes; a first optical layer, the first optical layer being between the plurality of light emitting elements; a second electrode, the second electrode being on the plurality of light emitting elements, the second electrode comprising a first region on the plurality of light emitting elements and a second region extending to the outside of the first optical layer; as well as A second optical layer surrounds the first optical layer, and the second optical layer is on the second region of the second electrode.

14. The display device according to claim 13, wherein: The first optical layer includes a first material and the second optical layer includes a second material different from the first material.

15. The display device according to claim 14, wherein: The first optical layer includes light scattering particles.

16. The display device according to claim 13, further comprising: A plurality of bank patterns are provided between the substrate and the plurality of first electrodes, and the plurality of first electrodes are provided on upper surfaces of the plurality of bank patterns.

17. The display device according to claim 16, further comprising: A plurality of signal lines extend between the plurality of bank patterns, the plurality of signal lines being connected to the plurality of first electrodes.

18. The display device according to claim 17, further comprising: A contact electrode is provided on the substrate and between the plurality of signal lines, the contact electrode being connected to the second electrode.

19. The display device according to claim 18, further comprising: a plurality of second electrodes, the plurality of second electrodes including the second electrode, the plurality of second electrodes being arranged across a plurality of pixel rows and each of the plurality of second electrodes being spaced apart from each other for each of the plurality of pixel rows, Wherein, the plurality of second electrodes are electrically connected to the contact electrode.

20. The display device according to claim 18, further comprising: an insulating layer, the insulating layer being on the substrate; A plurality of connecting wires, wherein the plurality of connecting wires are between the substrate and the insulating layer; as well as a pixel driving circuit connected to the plurality of connection lines, The plurality of connection lines are electrically connected to the plurality of first electrodes and the contact electrode.

Images