Display device and method for manufacturing display device

Abstract

This display device comprises: a substrate; a first electrode layer provided on the substrate; a second electrode layer, which is provided on the first electrode layer and includes a transparent electrode; a light-emitting layer, which is provided between the first electrode layer and the second electrode layer and includes a plurality of vertical light-emitting elements; and an anti-reflection layer provided on the second electrode layer.

Description

Display device and method of manufacturing a display device

[0001] The present disclosure relates to a display device including a vertical light-emitting element and a method for manufacturing the display device.

[0002] Display devices can be classified into self-emissive displays, where each pixel emits light on its own, and light-emitting displays, which require a separate light source.

[0003] Self-emissive displays, in which each pixel is equipped with a light-emitting element to emit light independently, do not require components such as backlight units and liquid crystal layers, and can also omit color filters; thus, they are structurally simple and offer high design freedom. Furthermore, not only can a thin thickness be achieved, but excellent contrast ratio, brightness, and viewing angle can also be realized.

[0004] Among self-emissive displays, micro LED displays are composed of multiple micro LEDs with a size in the micro range. Compared to LCDs that require a backlight, micro LED displays can provide excellent contrast, excellent response time, and excellent energy efficiency.

[0005] LEDs can be classified into horizontal LEDs, vertical LEDs, and flip LEDs depending on their structure.

[0006] In the case of vertical LEDs, the P-type and N-type electrodes are arranged vertically, allowing for a relatively small LED size and high light output relative to the size; therefore, research on this is currently underway.

[0007] The present disclosure may provide a display device comprising a transparent electrode capable of electrically connecting a plurality of vertical light-emitting elements and an anti-reflection layer for controlling reflection characteristics, and a method for controlling the display device.

[0008] A display device according to one embodiment of the present disclosure may include: a substrate; a first electrode layer provided on the substrate; a second electrode layer provided on the first electrode layer and including a transparent electrode; a light-emitting layer provided between the first electrode layer and the second electrode layer and including a plurality of vertical light-emitting elements; and an anti-reflection layer provided on the second electrode layer.

[0009] The anti-reflection layer has a first thickness in the vertical direction of the substrate and a first refractive index, and the second electrode layer has a second thickness in the vertical direction of the substrate and a second refractive index, and the first thickness may be determined based on the first refractive index, the second thickness and the second refractive index.

[0010] The above first thickness can be determined based on the following Equation 1 or Equation 2.

[0011] [Equation 1]

[0012]

[0013] (d1 is the first thickness, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3)

[0014] [Equation 2]

[0015]

[0016] (d1 is the first thickness, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3)

[0017] Based on the fact that the refractive index of the light-emitting layer is smaller than the second refractive index, the first thickness can be determined based on Equation 1.

[0018] Based on the fact that the refractive index of the light-emitting layer is greater than the second refractive index, the first thickness can be determined based on Equation 2.

[0019] The above anti-reflection layer can be directly laminated on the second electrode layer.

[0020] The light-emitting layer further comprises a connector that electrically connects the transparent electrode and the first electrode layer; the first electrode layer comprises at least one positive electrode that is electrically in contact with the first electrode of the plurality of vertical light-emitting elements and at least one negative electrode that is electrically in contact with the connector, and the transparent electrode may be electrically connected to the second electrode of the plurality of vertical light-emitting elements.

[0021] The above connector may include a first connector electrode that is electrically in contact with the transparent electrode and a second connector electrode that is electrically in contact with at least one negative electrode.

[0022] A method for manufacturing a display device according to one embodiment of the present disclosure may include: a step of forming a first electrode layer on a substrate; a step of forming a light-emitting layer comprising a plurality of vertical light-emitting elements on the first electrode layer; a step of forming a second electrode layer comprising a transparent electrode on the light-emitting layer; and a step of forming an anti-reflection layer on the second electrode layer.

[0023] The step of forming the anti-reflection layer on the second electrode layer is:

[0024] The method comprises the step of forming the anti-reflection layer on the second electrode layer with a first thickness in the vertical direction of the substrate; and the step of forming the second electrode layer on the light-emitting layer comprises the step of forming the second electrode layer on the light-emitting layer with a second thickness in the vertical direction of the substrate; wherein the anti-reflection layer has a first refractive index, the second electrode layer has a second refractive index, and the first thickness may be based on the first refractive index, the second thickness, and the second refractive index.

[0025] The above first thickness may be based on the following Equation 1 or Equation 2.

[0026] [Equation 1]

[0027]

[0028] (d1 is the first refractive index, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3)

[0029] [Equation 2]

[0030]

[0031] (d1 is the first refractive index, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3)

[0032] Based on the fact that the refractive index of the light-emitting layer is smaller than the second refractive index, the first thickness can be determined based on Equation 1.

[0033] Based on the fact that the refractive index of the light-emitting layer is greater than the second refractive index, the first thickness can be determined based on Equation 2.

[0034] The steps of: forming the second electrode layer on the light-emitting layer; and forming the anti-reflection layer on the second electrode layer; may include: selecting the thickness of the anti-reflection layer to a first thickness and selecting the thickness of the second electrode layer to a first thickness and selecting the thickness of the second electrode layer to a second thickness in order to make the reflective color of the display device a first color; and selecting the thickness of the anti-reflection layer to the first thickness and selecting the thickness of the second electrode layer to a third thickness different from the second thickness in order to make the reflective color of the display device a second color different from the first color.

[0035] The steps of: forming the second electrode layer on the light-emitting layer; and forming the anti-reflection layer on the second electrode layer; may include: selecting the thickness of the anti-reflection layer to a first thickness and selecting the thickness of the second electrode layer to a first thickness and selecting the thickness of the second electrode layer to a second thickness in order to make the reflection color of the display device a first color; and selecting the thickness of the anti-reflection layer to a third thickness different from the first thickness and selecting the thickness of the second electrode layer to the second thickness in order to make the reflection color of the display device a second color different from the first color.

[0036] The steps of: forming the second electrode layer on the light-emitting layer; and forming the anti-reflection layer on the second electrode layer; may include: selecting the thickness of the anti-reflection layer to a first thickness and selecting the thickness of the second electrode layer to a first thickness and selecting the thickness of the second electrode layer to a second thickness in order to make the reflection color of the display device a first color; and selecting the thickness of the anti-reflection layer to a third thickness different from the first thickness and selecting the thickness of the second electrode layer to a fourth thickness different from the second thickness in order to make the reflection color of the display device a second color different from the first color.

[0037] The step of forming the anti-reflection layer on the second electrode layer may include the step of determining the material of the anti-reflection layer based on the refractive index of the second electrode layer.

[0038] The step of determining the material of the anti-reflection layer may include the step of determining the material of the anti-reflection layer so as to be close to a predetermined value determined according to the refractive index of the second electrode layer.

[0039] The step of forming the first electrode layer on the substrate includes the step of laminating an adhesive film on the substrate; and the step of forming the light-emitting layer on the first electrode layer may include the step of bonding or transferring a connector for electrically connecting the plurality of vertical light-emitting elements, the transparent electrode, and the first electrode layer to the substrate on which the adhesive film is laminated.

[0040] The step of forming the anti-reflection layer on the second electrode layer includes the step of directly laminating the anti-reflection layer on the second electrode layer; and may further include the step of forming an optical film on the anti-reflection layer.

[0041] According to the present disclosure, there is an effect of preventing or reducing thin-film interference that may occur due to a transparent electrode for electrically connecting a plurality of vertical light-emitting elements.

[0042] According to the present disclosure, there is an effect of reducing the reflectance of light passing through a display device.

[0043] According to the present disclosure, by adjusting the thickness of the transparent electrode and the anti-reflection layer, it is possible to achieve a variety of reflection colors of light passing through a display device.

[0044] FIG. 1 is a perspective view showing an example of a display module according to one embodiment and a display device including the same.

[0045] FIG. 2 is a diagram showing an example of a pixel array constituting a unit module of a display device according to one embodiment.

[0046] FIG. 3 is an enlarged cross-sectional view of one side of a display device according to one embodiment.

[0047] FIGS. 4 and FIGS. 5 are drawings for explaining the process of light being reflected after passing through a display device according to one embodiment.

[0048] FIG. 6 is a table for explaining the reflection color of light passing through a display device according to the thickness of the anti-reflection layer and the thickness of the transparent electrode according to one embodiment.

[0049] FIG. 7 is a flowchart of a method for manufacturing a display device according to one embodiment.

[0050] FIG. 8 is a cross-sectional view illustrating a method for manufacturing a display device according to one embodiment.

[0051] FIG. 9 is an enlarged cross-sectional view of one side of a display device according to one embodiment.

[0052] FIGS. 10 and 11 illustrate an example in which a transparent electrode and a cathode are electrically contacted according to one embodiment.

[0053] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments.

[0054] In relation to the description of the drawings, similar reference numerals may be used for similar or related components.

[0055] The singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0056] In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0057] The term "and / or" includes a combination of multiple related described components or any of the multiple related described components.

[0058] The terms "part," "module," and "component" may be implemented in hardware or software. Depending on the embodiments, a plurality of "parts," "modules," and "components" may be implemented as a single component, or a single "part," "module," or "component" may include a plurality of components.

[0059] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish a component from another corresponding component and do not limit the components in other aspects (e.g., importance or order).

[0060] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0061] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this document, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0062] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0063] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0064] Meanwhile, terms such as "front," "rear," "left," "right," "top," and "bottom" used in the following description are defined based on the drawings; however, the shape and position of each component are not limited by these terms. For example, the front side may be defined as the +X side and the rear side as the -X side. For example, based on the drawings, the right side may be defined as the +Y side and the left side as the -Y side. For example, based on the drawings, the top side may be defined as the +Z side and the bottom side as the -Z side.

[0065] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0066] FIG. 1 is a perspective view showing an example of a display module according to one embodiment and a display device including the same.

[0067] FIG. 2 is a diagram showing an example of a pixel array constituting a unit module of a display device according to one embodiment.

[0068] A display device according to one embodiment is a self-emissive display device in which a light-emitting element is arranged for each pixel, allowing each pixel to emit light on its own. Therefore, unlike liquid crystal display devices, it does not require components such as a backlight unit or a liquid crystal layer, so a thin thickness can be achieved, and various design changes are possible due to its simple structure.

[0069] In addition, a display device according to one embodiment may employ an inorganic light-emitting diode, such as an inorganic light-emitting diode, as a light-emitting element placed in each pixel. The inorganic light-emitting diode has a faster response speed compared to an organic light-emitting diode, such as an OLED, and can achieve high brightness with low power consumption.

[0070] In addition, unlike organic light-emitting diodes, which are vulnerable to exposure to moisture and oxygen, require an encapsulation process, and have poor durability, it does not require an encapsulation process and has strong durability. Hereinafter, the inorganic light-emitting diode mentioned in the embodiments described below refers to an inorganic light-emitting diode.

[0071] An inorganic light-emitting element employed in a display device according to one embodiment may be a micro LED having a short side length of approximately 100 μm, approximately tens of μm, or several μm. In this way, by employing a micro LED, the pixel size can be reduced and high resolution can be achieved even within the same screen size.

[0072] In addition, manufacturing LED chips in micro-sized units can solve the problem of inorganic materials breaking when bent due to their characteristics. That is, when micro LED chips are transferred onto a flexible substrate, the LED chips do not break even if the substrate is bent, making it possible to realize flexible display devices.

[0073] A display device employing micro LEDs can be applied to various fields by utilizing ultra-small pixel size and thin thickness. For example, as shown in FIG. 1, a large-area screen can be realized by tiling a plurality of display modules (10) on which a plurality of micro LEDs are transferred and fixing them to a main body (20), and such a large-area screen display device (1) can be used as signage, an electronic display board, etc.

[0074] The three-dimensional coordinate system of the XYZ axes shown in FIG. 1 is based on the display device (1), and the plane where the screen of the display device (1) is located is the XZ plane, and the direction in which the image is output or the direction of light emission of the inorganic light-emitting element is the +Y direction. Since the coordinate system is based on the display device (1), the same coordinate system can be applied whether the display device (1) is lying down or standing up.

[0075] Generally, the display device (1) is used in an upright position, and the user views the image from the front of the display device (1), so the +Y direction in which the image is output can be called the front, and the opposite direction can be called the rear.

[0076] Generally, the display device (1) is manufactured in a lying position. Therefore, it is possible to refer to the -Y direction of the display device (1) as the lower direction and the +Y direction as the upper direction. That is, in the embodiment described below, the +Y direction may be referred to as the upper direction or the front, and the -Y direction may be referred to as the lower direction or the rear.

[0077] The remaining four sides, excluding the top and bottom surfaces of the flat-panel display device (1) or display module (10), are all referred to as sides regardless of the orientation of the display device (1) or display module (10).

[0078] In the example of FIG. 1, a case is illustrated in which a display device (1) includes a plurality of display modules to implement a large-area screen, but the embodiment of the display device (1) is not limited thereto. It is also possible for the display device (1) to include a single display module (10) to be implemented as a TV, a wearable device, a portable device, a PC monitor, etc.

[0079] Referring to FIG. 2, the display module (10) may include a plurality of pixels arranged in two dimensions, i.e., a pixel array of M x N (M, N is an integer greater than or equal to 2). FIG. 2 conceptually illustrates the pixel array, and it is understood that in addition to the active area where the pixels are arranged in the display module (10), there may also be a bezel area where an image is not displayed or a wiring area.

[0080] In the embodiments thereof, the fact that certain components are arranged in two dimensions may include not only cases where the components are placed on the same plane, but also cases where they are placed on different planes parallel to each other. Additionally, when the components are placed on the same plane, the tops of the placed components must not necessarily be located on the same plane, and may include cases where the tops of the placed components are located on different planes parallel to each other.

[0081] A pixel (P) may include multiple subpixels that output light of different colors to realize various colors by color combinations. For example, a pixel (P) may consist of at least three subpixels that output light of different colors. Specifically, a pixel (P) may consist of three subpixels (SP(R), SP(G), SP(B)) corresponding to R, G, and B, respectively. Here, the red subpixel (SP(R)) may output red light, the green subpixel (SP(G)) may output green light, and the blue subpixel (SP(B)) may output blue light.

[0082] However, the pixel arrangement of FIG. 2 is merely an example that can be applied to a display module (10) and a display device (1) according to one embodiment, and it is possible for the subpixels to be arranged along the X-axis direction, not arranged in a row, and for the sizes of the subpixels to be different. It is sufficient for a single pixel to include multiple subpixels to implement various colors, and there are no restrictions on the size or arrangement method of each subpixel.

[0083] In addition, a pixel (P) is not necessarily composed of a red subpixel (SP(R)) that outputs red light, a green subpixel (SP(G)) that outputs green light, and a blue subpixel (SP(B)) that outputs blue light; it is also possible to include subpixels that output yellow light or white light. In other words, there are no restrictions on the color or type of light output from each subpixel, or on the number of subpixels.

[0084] However, for the sake of specific explanation in the embodiments described below, the case in which the pixel (P) is composed of a red subpixel (SP(R)), a green subpixel (SP(G)), and a blue subpixel (SP(B)) will be described as an example.

[0085] As previously mentioned, the display module (10) and the display device (1) according to one embodiment are self-emissive display devices in which each pixel can emit light on its own. Accordingly, an inorganic light-emitting element that emits light of a different color may be placed in each subpixel. For example, a red vertical light-emitting element (100R, see FIG. 3) may be placed in the red subpixel (SP(R)), a green vertical light-emitting element (100G, see FIG. 3) may be placed in the green subpixel (SP(G)), and a blue inorganic light-emitting element (100B, see FIG. 3) may be placed in the blue subpixel (SP(B)).

[0086] Accordingly, in the present embodiment, the pixel (P) may represent a cluster including a red vertical light-emitting element (100R, see FIG. 3), a green vertical light-emitting element (100G, see FIG. 3), and a blue inorganic light-emitting element (100B, see FIG. 3), and the subpixel may represent each vertical light-emitting element.

[0087] In the following description, the explanation is based on the display device (1), but the following description may also be applied to each of the plurality of display modules (10) of the display device (1).

[0088] FIG. 3 is an enlarged cross-sectional view of one side of a display device according to one embodiment.

[0089] Referring to FIG. 3, a display device (1) according to one embodiment may include a substrate (20).

[0090] The upper side of the substrate (20) may represent the +Y direction. The lower side of the substrate (20) may represent the -Y direction.

[0091] Various configurations (e.g., a plurality of vertical light-emitting elements (100R, 100G, 100B)) may be arranged on the substrate (20).

[0092] The substrate (20) can be formed from various materials. For example, the substrate (20) may be formed from transparent glass with SiO2 as the main component, may be formed from transparent plastic to have flexibility, and may also be formed from metal.

[0093] The substrate (20), although not shown in FIG. 3, may include a glass substrate (not shown), a buffer layer (not shown) for providing a flat surface on the upper side of the glass substrate, and a thin film transistor (TFT) formed on the upper side of the buffer layer for supplying driving current to a plurality of vertical light-emitting elements (100R, 100G, 100B).

[0094] A display device (1) according to one embodiment may include a first electrode layer (30) provided on a substrate (20).

[0095] The first electrode layer (30) may be an electrode layer in which a plurality of electrodes are formed.

[0096] For example, the first electrode layer (30) may include at least one positive electrode and at least one negative electrode.

[0097] At least one anode may include a first anode (31R), a second anode (31G) and / or a third anode (31B).

[0098] The first anode (31R) may be an electrode for transmitting a driving current supplied from a thin film transistor (TFT) included in the substrate (20) to a red vertical light-emitting element (100R).

[0099] The second anode (31G) may be an electrode for delivering a driving current supplied from a Thin Film Transistor (TFT) included in the substrate (20) to a green vertical light-emitting element (100G).

[0100] The third anode (31B) may be an electrode for transmitting a driving current supplied from a Thin Film Transistor (TFT) included in the substrate (20) to a blue vertical light-emitting element (100B).

[0101] The first anode (31R), the second anode (31G), and the third anode (31B) can each be referred to as an anode.

[0102] At least one anode may be composed of one or multiple anodes, but below it is described as being composed of multiple anodes (31R, 31G, 31B).

[0103] At least one cathode (32) may be an electrode through which a driving current flows through a plurality of vertical light-emitting elements (100R, 100G, 100B).

[0104] At least one negative electrode (32) can be referred to as a cathode.

[0105] At least one cathode (32) may be a common electrode composed of one electrode that can be electrically connected to a plurality of anodes (e.g., first anode (31R), second anode (31G), third anode (31B)).

[0106] At least one cathode (32) may be composed of one or multiple, but below it is described as being composed of one cathode (32).

[0107] A display device (1) according to one embodiment may include a light-emitting layer (40) provided on a first electrode layer (30).

[0108] The light-emitting layer (40) may include a plurality of vertical light-emitting elements (100R, 100G, 100B).

[0109] A plurality of vertical light-emitting elements (100R, 100G, 100B) may include a red vertical light-emitting element (100R), a green vertical light-emitting element (100G), and / or a blue vertical light-emitting element (100B).

[0110] Each of the plurality of vertical light-emitting elements (100R, 100G, 100B) may include a first semiconductor layer (111R, 111G, 111B).

[0111] The first semiconductor layer (111R, 111G, 111B) may be a P-type semiconductor layer. For example, the first semiconductor layer (111R, 111G, 111B) may be a P-GaN layer doped with a P-type material.

[0112] Each of the plurality of vertical light-emitting elements (100R, 100G, 100B) may include a first electrode (110R, 110G, 110B) provided on the lower side of the first semiconductor layer (111R, 111G, 111B).

[0113] The first electrode (110R, 110G, 110B) can be electrically contacted with the first semiconductor layer.

[0114] The first electrode (110R, 110G, 110B) may be a P-type electrode.

[0115] The first electrode (110R, 110G, 110B) can be electrically contacted with the positive electrode (31R, 31G, 31B).

[0116] The first electrode (110R, 110G, 110B) is electrically contacted with the positive electrode (31R, 31G, 31B) so that the driving current received from the positive electrode (31R, 31G, 31B) can flow to the first semiconductor layer (111R, 111G, 111B).

[0117] Each of the plurality of vertical light-emitting elements (100R, 100G, 100B) may include a second semiconductor layer (121R, 121G, 121B) disposed on the upper side of the first semiconductor layer (111R, 111G, 111B).

[0118] The second semiconductor layer (121R, 121G, 121B) may be an N-type semiconductor layer. For example, the second semiconductor layer (121R, 121G, 121B) may be an N-GaN layer doped with an N-type material.

[0119] The first semiconductor layer (111R, 111G, 111B) and the second semiconductor layer (121R, 121G, 121B) can be arranged vertically with respect to the substrate (20).

[0120] For example, the first semiconductor layer (111R, 111G, 111B) and the second semiconductor layer (121R, 121G, 121B) can be arranged in the +Y direction, which is the vertical direction of the substrate (20).

[0121] Each of the plurality of vertical light-emitting elements (100R, 100G, 100B) may include an active layer (130R, 130G, 130B) disposed between a first semiconductor layer (111R, 111G, 111B) and a second semiconductor layer (121R, 121G, 121B).

[0122] The active layer (130R, 130G, 130B) may be a light-emitting layer disposed between the first semiconductor layer (111R, 111G, 111B) and the second semiconductor layer (121R, 121G, 121B) in which electrons and holes combine to emit light.

[0123] Each of the plurality of vertical light-emitting elements (100R, 100G, 100B) may include a second electrode (120R, 120G, 120B) provided on the upper side of the second semiconductor layer (121R, 121G, 121B).

[0124] The second electrode (120R, 120G, 120B) may be an N-type electrode.

[0125] The second electrode (120R, 120G, 120B) can be electrically contacted with the transparent electrode (51).

[0126] The second electrode (120R, 120G, 120B) may be composed of multiple electrodes. For example, the second electrode (120R, 120G, 120B) may be placed at the edge and central portion of each of the multiple vertical light-emitting elements (100R, 100G, 100B).

[0127] The second electrode (120R, 120G, 120B) may be configured to be smaller in size than the first electrode (110R, 110G, 110B). However, it is not limited thereto, and the size of the second electrode (120R, 120G, 120B) may be larger than the size of the first electrode (110R, 110G, 110B) and may be the same size as the first electrode (110R, 110G, 110B).

[0128] Although it has been described that the first electrode (110R, 110G, 110B) is a P-type electrode and the second electrode (120R, 120G, 120B) is an N-type electrode, according to various embodiments, the first electrode (110R, 110G, 110B) may be an N-type electrode and the second electrode (120R, 120G, 120B) may be a P-type electrode. In addition, in this case, the first semiconductor layer (111R, 111G, 111B) may be an N-type semiconductor layer and the second semiconductor layer (121R, 121G, 121B) may be a P-type semiconductor layer.

[0129] However, below, the first electrode (110R, 110G, 110B) is described as a P-type electrode and the second electrode is an N-type electrode.

[0130] The first electrode (110R, 110G, 110B) and the second electrode can be arranged in the vertical direction of the substrate (20).

[0131] That is, the light-emitting element according to the present disclosure may be a vertical light-emitting element.

[0132] Unlike lateral or flip types, where different electrodes (e.g., N-type electrode and P-type electrode) are arranged horizontally relative to the substrate, vertical light-emitting devices have different electrodes (e.g., N-type electrode and P-type electrode) arranged vertically relative to the substrate, allowing for a relatively smaller size of the light-emitting device and the realization of high-output light emission.

[0133] The light-emitting layer (40) may include a connector (150) that electrically connects the transparent electrode (51) and the first electrode layer (30). For example, the connector (150) may electrically connect the transparent electrode (51) and the negative electrode (32).

[0134] Specifically, the connector (150) may include a first connector electrode (151) that is electrically in contact with a transparent electrode (51) and a second connector electrode (152) that is electrically in contact with a negative electrode (32). Additionally, the connector (150) may include a connector semiconductor layer (153) disposed between the first connector electrode (151) and the second connector electrode (152).

[0135] As a result, the transparent electrode (51) and the negative electrode (32) can be electrically connected.

[0136] The light-emitting layer (40) may include an adhesive film (42). The adhesive film (42) may be a conductive adhesive film. For example, the adhesive film (42) may be composed of an anisotropic conductive film (ACF). However, the material of the adhesive film (42) is not limited thereto. For example, the adhesive film (42) may be composed of a non-conductive film (NCF).

[0137] The adhesive film (42) may be an anisotropic conductive adhesive film (Black Anisotropic Conductive Film; Black ACF) composed of a black polymer resin.

[0138] Additionally, the adhesive film (42) may be a non-conductive adhesive film (Black Non-Conductive Film; Black NCF) composed of a black polymer resin.

[0139] A portion of the first electrode layer (30) may also be composed of an adhesive film (42).

[0140] The adhesive film (42) may be a material that allows electrical connection in the vertical direction (Y direction) of the substrate (20) but is insulating in the horizontal direction (X direction) of the substrate (20). The adhesive film (42) may include a conductive medium. For example, the adhesive film (42) may include conductive balls. That is, the adhesive film (42) is a film in which conductive balls are mixed with an insulating base member, so that when heat and pressure are applied, only a specific part (e.g., a part where a plurality of vertical light-emitting elements (100R, 100G, 100B) and at least one anode (31R, 31G, 31B) come into contact) can be made conductive by the conductive balls.

[0141] The conductive medium of the adhesive film (42) can be configured in various ways according to the various embodiments, not just the conductive ball.

[0142] For example, if the adhesive film (42) is a non-conductive film (NCF), the conductive medium of the adhesive film (42) may be composed of elastic protrusions or nano carbon.

[0143] Elastic protrusions are conductive protrusions that have elasticity and have a size of approximately 1 to 3 µm. Nano carbon is a conductive material composed of carbon particles of nanometer (nm) size mixed with resin.

[0144] A display device (1) according to one embodiment may include a second electrode layer (50) provided on a first electrode layer (30). For example, the second electrode layer (50) may be provided on the first electrode layer (30), and a light-emitting layer (40) may be provided between the first electrode layer (30) and the second electrode layer (50).

[0145] A display device (1) according to one embodiment may include a second electrode layer (50) provided on a light-emitting layer (40).

[0146] The second electrode layer (50) may include a transparent electrode (51). The transparent electrode (51) may be composed of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), nano wire paste, etc., and may have transparent properties and be conductive.

[0147] A plurality of vertical light-emitting elements (100R, 100G, 100B) can be electrically connected by a transparent electrode (51). For example, the transparent electrode (51) can be electrically connected by contacting the second electrode (120R, 120G, 120B) of each of the plurality of vertical light-emitting elements (100R, 100G, 100B).

[0148] The transparent electrode (51) is electrically contacted with the first connector electrode (151) of the connector (150) to electrically connect a plurality of vertical light-emitting elements (100R, 100G, 100B) and the first connector electrode (151) of the connector (150).

[0149] A display device (1) according to one embodiment may include an anti-reflection layer (60) provided on a second electrode layer (50).

[0150] The anti-reflection layer (60) may be composed of a transparent material. For example, the anti-reflection layer (60) may include SiO2 (silicon dioxide), MgF2 (magnesium fluoride), Al2O3 (aluminum oxide), TiO2 (titanium dioxide), ZrO2 (zirconium dioxide), etc., which have transparent properties.

[0151] According to one embodiment, the anti-reflection layer (60) may be directly laminated on the second electrode layer (50).

[0152] The anti-reflection layer (60) being directly laminated on the second electrode layer (50) may include the anti-reflection layer (60) being laminated on the second electrode layer (50) so that the anti-reflection layer (60) and the second electrode layer (50) are in contact with each other, without any other components being laminated between the anti-reflection layer (60) and the second electrode layer (50).

[0153] FIGS. 4 and FIGS. 5 are drawings for explaining the process of light being reflected after passing through a display device according to one embodiment.

[0154] Referring to FIG. 4, each of the light-emitting layer (40), the second electrode layer (50), and the anti-reflection layer (60) may have a predetermined refractive index.

[0155] The anti-reflection layer (60) may have a first refractive index (n1).

[0156] The second electrode layer (50) may have a second refractive index (n2).

[0157] The light-emitting layer (40) may have a third refractive index (n3), which is the refractive index of the adhesive film (42).

[0158] The anti-reflection layer (60) may have a first thickness (d1) in the vertical direction (Y direction) of the substrate (20).

[0159] The second electrode layer (50) may have a second thickness (d2) in the vertical direction (Y direction) of the substrate (20).

[0160] The second electrode layer (50) may include a transparent electrode (51) as described above. The transparent electrode (51) has a high transmittance, but due to its transparent nature, it has a high reflectivity, so the blackness may be reduced when viewing the display device (1) from the outside.

[0161] In particular, when light reflected from the upper side of the transparent electrode (51) and light reflected from the lower side of the transparent electrode (51) meet, constructive interference occurs, and light of a specific wavelength is strongly reflected and can be seen as a color of a specific wavelength.

[0162] In the following, according to the present disclosure, an example is described in which the black visual effect can be improved by preventing or reducing the strong reflection of light of a specific wavelength by a transparent electrode (51).

[0163] When light is incident from the outside, it can be reflected as light (①) reflected from the upper side of the anti-reflection layer (60), light (②) reflected from the upper side of the second electrode layer (50), and light (③) reflected from the upper side of the light-emitting layer (40), respectively.

[0164] Even if the reinforcing interference condition by the second electrode layer (50) is satisfied so that the light (②) reflected from the upper side of the second electrode layer (50) and the light (③) reflected from the upper side of the light-emitting layer (40) undergo reinforcing interference with each other, if the destructive interference condition by the anti-reflection layer (60) is satisfied, the reinforcing interference light undergoes destructive interference with the light (①) reflected from the upper side of the anti-reflection layer (60), thereby preventing the strong reflection of light of a specific wavelength.

[0165] The reinforcement interference condition by the second electrode layer (50) can follow Equation 1 below, as in case the second refractive index (n2) of the second electrode layer (50) is greater than the first refractive index (n1) of the anti-reflection layer (60), fixed-end reflection occurs on the upper side of the second electrode layer (50) and the phase changes by 180°, and in case the second refractive index (n2) of the second electrode layer (50) is greater than the third refractive index (n3) of the light-emitting layer (40), free-end reflection occurs on the upper side of the light-emitting layer (40) and the phase does not change.

[0166] [Equation 1]

[0167]

[0168] ( is the wavelength of light where constructive interference occurs according to the second thickness (d2) of the second electrode layer (50), n2 is the second refractive index, d2 is the second thickness of the second electrode layer (50), and m1 is 1, 2 or 3)

[0169] m1 is a wavelength of light (where constructive interference can occur depending on the second refractive index (n2) and the second thickness (d2) of the second electrode layer (50). The range of ) can be a natural number that can be in the visible light range (e.g., 380nm to 780nm).

[0170] For example, when the second refractive index (n2) is 1.858 and the second thickness (d2) of the second electrode layer (50) is in the range of 60 nm to 400 nm, m1, which can be 1, 2, or 3, can have a wavelength of light in the visible light region (e.g., 380 nm to 780 nm) where constructive interference occurs by the second electrode layer (50).

[0171] The cancellation interference condition by the anti-reflection layer (60) can follow Equation 2 below, since when the first refractive index (n1) of the anti-reflection layer (60) is greater than the external refractive index (e.g., n0=1), fixed-end reflection occurs on the upper side of the anti-reflection layer (60) and the phase changes by 180°.

[0172] [Equation 2]

[0173]

[0174] ( is the wavelength of light where constructive interference occurs according to the second thickness (d2) of the second electrode layer (50), n1 is the first refractive index, d1 is the first thickness of the anti-reflection layer (60), and m2 is 1)

[0175] m2 can be 1, which is a value that minimizes the first thickness (d1) of the anti-reflection layer (60).

[0176] By rearranging the above-mentioned Equations 1 and 2, the first thickness (d1) of the anti-reflection layer (60) can be determined according to Equation 3 below.

[0177] [Equation 3]

[0178]

[0179] (d1 is the first thickness (d1) of the anti-reflection layer (60), n2 is the second thickness (d2) of the second electrode layer (50), n1 is the first refractive index (n1) of the anti-reflection layer (60), m1 is 1, 2 or 3)

[0180] The above equations (Equation 1, Equation 2, Equation 3) may assume that the light incident from the outside is perpendicular light. Therefore, depending on the angle of the light incident from the outside, the above equations (Equation 1, Equation 2, Equation 3) may be defined differently.

[0181] Referring to FIG. 5, the first thickness (d1) of the anti-reflection layer (60) can be determined according to Equation 4 below.

[0182] [Equation 4]

[0183]

[0184] (d1 is the first thickness (d1) of the anti-reflection layer (60), n2 is the second thickness (d2) of the second electrode layer (50), n1 is the first refractive index (n1) of the anti-reflection layer (60), m1 is 1, 2 or 3)

[0185] For example, when the third refractive index (n3) of the light-emitting layer (40) is greater than the second thickness (d2) of the second electrode layer (50), fixed-end reflection occurs on the upper side of the light-emitting layer (40) and the phase changes by 180°, so the first thickness (d1) of the anti-reflection layer (60) can be determined according to Equation 4 above.

[0186] In one embodiment, the first thickness (d1) of the anti-reflection layer (60) can be determined based on the first refractive index (n1) of the anti-reflection layer (60), the second thickness (d2) of the second electrode layer (50), and the second refractive index (n2) of the second electrode layer (50).

[0187] For example, the first thickness (d1) of the anti-reflection layer (60) can be determined based on the above-described Equation 3 or Equation 4.

[0188] The first thickness (d1) of the anti-reflection layer (60) according to the present disclosure can be determined according to various embodiments as well as the above-described Equation 3 or Equation 4.

[0189] For example, the first thickness (d1) of the anti-reflection layer (60) can be determined to be approximately 0.5 times or 0.25 times the second thickness (d2) of the second electrode layer (50).

[0190] The material of the anti-reflection layer (60) can be determined according to the second refractive index (n2) of the second electrode layer (50).

[0191] For example, the material of the anti-reflection layer (60) can be determined as a material having the refractive index closest to the refractive index (ns) according to Equation 5 below.

[0192] [Equation 5]

[0193]

[0194] (n0 is 1, n2 is the second refractive index of the second electrode layer (50))

[0195] When the second refractive index (n2) of the second electrode layer (50) is 1.858, the refractive index (ns) according to Equation 5 above may be approximately 1.363.

[0196] Therefore, the material of the anti-reflection layer (60) can be determined to be a material having a refractive index closest to 1.363. Further details regarding this will be described later.

[0197] FIG. 6 is a table for explaining the reflection color of light passing through a display device according to the thickness of the anti-reflection layer and the thickness of the transparent electrode according to one embodiment.

[0198] Referring to FIG. 6, the reflective color of the display device (1) can be determined according to the thickness of the anti-reflection layer (60) and the thickness of the second electrode layer (50). The thickness of the second electrode layer (50) may be the thickness of the transparent electrode (51).

[0199] The reflective color of the display device (1) refers to the color that is visible when light incident from the outside is reflected into the display device (1).

[0200] For example, if the thickness of the anti-reflection layer (60) is 70 nm and the thickness of the transparent electrode (51) is 200 nm, the reflective color of the display device (1) can be seen as one color.

[0201] As another example, if the thickness of the anti-reflection layer (60) is 90 nm, which is different from 70 nm, and the thickness of the transparent electrode (51) is 200 nm, the reflective color of the display device (1) can be seen as two colors.

[0202] As another example, if the thickness of the anti-reflection layer (60) is 70 nm and the thickness of the transparent electrode (51) is 300 nm, which is different from 200 nm, the reflective color of the display device (1) can be seen as three colors.

[0203] That is, the reflective color of the display device (1) visible to the outside may differ depending on the thickness of the anti-reflection layer (60) and the thickness of the transparent electrode (51).

[0204] FIG. 7 is a flowchart of a method for manufacturing a display device according to one embodiment.

[0205] FIG. 8 is a cross-sectional view illustrating a method for manufacturing a display device according to one embodiment.

[0206] Referring to FIGS. 7 and FIGS. 8, a method for manufacturing a display device (1) according to one embodiment may include a step (S1) of forming a first electrode layer (30) on a substrate (20).

[0207] The step (S1) of forming a first electrode layer (30) on a substrate (20) may include the step of forming a plurality of positive electrodes (31R, 31G, 31B) and a negative electrode (32) on the substrate (20).

[0208] Additionally, the step (S1) of forming a first electrode layer (30) on a substrate (20) may include the step of laminating an adhesive film (42) on the substrate (20).

[0209] For example, the step (S1) of forming a first electrode layer (30) on a substrate (20) may include the step of applying an adhesive film (42) containing a conductive ball (41) onto the substrate (20) while a plurality of positive electrodes (31R, 31G, 31B) and a negative electrode (32) are formed on the substrate (20). Accordingly, the conductive ball (41) may be disposed on the plurality of positive electrodes (31R, 31G, 31B) and the negative electrode (32).

[0210] A method for manufacturing a display device (1) according to one embodiment may include the step (S2) of forming a light-emitting layer (40) comprising a plurality of vertical light-emitting elements (100R, 100G, 100B) on a first electrode layer (30).

[0211] The step (S2) of forming a light-emitting layer (40) including a plurality of vertical light-emitting elements (100R, 100G, 100B) on a first electrode layer (30) may include the step of bonding or transferring the plurality of vertical light-emitting elements (100R, 100G, 100B) and a connector (150) to a substrate (20) on which an adhesive film (42) is laminated.

[0212] Bonding a plurality of vertical light-emitting elements (100R, 100G, 100B) and a connector (150) to a substrate (20) on which an adhesive film (42) is laminated may include pressing a relay substrate (not shown) on which a plurality of vertical light-emitting elements (100R, 100G, 100B) and a connector (150) are transferred with the substrate (20) on which the adhesive film (42) is laminated.

[0213] Transferring a plurality of vertical light-emitting elements (100R, 100G, 100B) and a connector (150) to a substrate (20) on which an adhesive film (42) is laminated may include separating the plurality of vertical light-emitting elements (100R, 100G, 100B) and the connector (150) from a relay substrate (not shown) on which the plurality of vertical light-emitting elements (100R, 100G, 100B) and the connector (150) are transferred, and attaching them to the substrate (20) on which the adhesive film (42) is laminated.

[0214] Through the step (S2) of forming a light-emitting layer (40) including a plurality of vertical light-emitting elements (100R, 100G, 100B) on a first electrode layer (30), the plurality of vertical light-emitting elements (100R, 100G, 100B) and the connector (150) can be seated within an adhesive film (42), and a light-emitting layer (40) including the plurality of vertical light-emitting elements (100R, 100G, 100B) and the connector (150) can be formed.

[0215] Additionally, when the step (S2) of forming a light-emitting layer (40) including a plurality of vertical light-emitting elements (100R, 100G, 100B) on the first electrode layer (30) is performed, the plurality of vertical light-emitting elements (100R, 100G, 100B) and the connector (150) can be electrically connected through the plurality of positive electrodes (31R, 31G, 31B) and negative electrodes (32) of the first electrode layer (30) and the conductive ball (41).

[0216] A method for manufacturing a display device (1) according to one embodiment may include the step (S3) of forming a second electrode layer (50) including a transparent electrode (51) on a light-emitting layer (40).

[0217] The step (S3) of forming a second electrode layer (50) including a transparent electrode (51) on a light-emitting layer (40) may include the step of stacking a transparent electrode (51), composed of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), nano wire paste, etc., on the light-emitting layer (40).

[0218] When the step (S3) of forming a second electrode layer (50) including a transparent electrode (51) on a light-emitting layer (40) is performed, a plurality of vertical light-emitting elements (100R, 100G, 100B) can be electrically connected through a connector (150) and a transparent electrode (51).

[0219] A method for manufacturing a display device (1) according to one embodiment may include the step (S4) of forming an anti-reflection layer (60) on a second electrode layer (50).

[0220] The material of the anti-reflection layer (60) may be composed of SiO2 (silicon dioxide), MgF2 (magnesium fluoride), Al2O3 (aluminum oxide), TiO2 (titanium dioxide), ZrO2 (zirconium dioxide), etc., which have transparent properties.

[0221] The step (S4) of forming an anti-reflection layer (60) on the second electrode layer (50) may include the step of directly laminating the anti-reflection layer (60) on the second electrode layer (50).

[0222] Laminating the anti-reflection layer (60) directly onto the second electrode layer (50) may include laminating the anti-reflection layer (60) onto the second electrode layer (50) so that the anti-reflection layer (60) and the second electrode layer (50) come into contact with each other, without laminating any other configuration between the anti-reflection layer (60) and the second electrode layer (50).

[0223] A step (S4) of forming an anti-reflection layer (60) on a second electrode layer (50) according to one embodiment may include forming an anti-reflection layer (60) composed of a material having a first refractive index (n1, see FIG. 4) on the second electrode layer (50) with a first thickness (d1, see FIG. 4) in the vertical direction of the substrate (20). Additionally, a step (S3) of forming a second electrode layer (50) including a transparent electrode (51) composed of a material having a second refractive index (n2, see FIG. 4) on a light-emitting layer (40) according to one embodiment may include forming a second electrode layer (50) on the light-emitting layer (40) with a second thickness (d2, see FIG. 4) in the vertical direction of the substrate (20).

[0224] The step (S4) of forming an anti-reflection layer (60) on the second electrode layer (50) may include determining the first thickness (d1, see FIG. 4) of the anti-reflection layer (60) based on the first refractive index (n1) of the anti-reflection layer (60), the second thickness (d2) of the second electrode layer (50), and the second refractive index (n2) of the second electrode layer (50), and forming the anti-reflection layer (60) on the second electrode layer (50) accordingly.

[0225] The first thickness (d1, see FIG. 4) of the anti-reflection layer (60) can be determined based on the following Equation 3 or Equation 4 described above in FIG. 4 and FIG. 5.

[0226] [Equation 3]

[0227]

[0228] (d1 is the first thickness (d1) of the anti-reflection layer (60), n2 is the second thickness (d2) of the second electrode layer (50), n1 is the first refractive index (n1) of the anti-reflection layer (60), m1 is 1, 2 or 3)

[0229] [Equation 4]

[0230]

[0231] (d1 is the first thickness (d1) of the anti-reflection layer (60), n2 is the second thickness (d2) of the second electrode layer (50), n1 is the first refractive index (n1) of the anti-reflection layer (60), m1 is 1, 2 or 3)

[0232] For example, if the second refractive index (n2) of the second electrode layer (50) is greater than the third refractive index (n3) of the light-emitting layer (40), the first thickness (d1, see FIG. 4) of the anti-reflection layer (60) can be determined according to Equation 3 above.

[0233] As another example, when the second refractive index (n2) of the second electrode layer (50) is smaller than the third refractive index (n3) of the light-emitting layer (40), the first thickness (d1, see FIG. 4) of the anti-reflection layer (60) can be determined according to Equation 4 above.

[0234] However, according to the present disclosure, the first thickness (d1, see FIG. 4) of the anti-reflection layer (60) can be determined according to various embodiments as well as Equation 3 or Equation 4.

[0235] For example, the first thickness (d1) of the anti-reflection layer (60) can be determined to be approximately 0.5 times or 0.25 times the second thickness (d2) of the second electrode layer (50).

[0236] The step (S4) of forming an anti-reflection layer (60) on a second electrode layer (50) according to one embodiment may include the step of determining the material of the anti-reflection layer (60) based on the second refractive index (n2, see FIG. 4) of the second electrode layer (50).

[0237] The step of determining the material of the anti-reflection layer (60) based on the second refractive index (n2, see FIG. 4) of the second electrode layer (50) may include the step of determining the material of the anti-reflection layer (60) so as to be close to a predetermined value determined according to the second refractive index (n2, see FIG. 4) of the second electrode layer (50).

[0238] For example, in the step (S4) of forming an anti-reflection layer (60) on the second electrode layer (50), the first refractive index (n1) of the anti-reflection layer (60) is a refractive index (n) according to the following Equation 5 described above in FIGS. 4 and 5. s It can be determined as the material having the refractive index closest to ).

[0239] [Equation 5]

[0240]

[0241] (n0 is 1, n2 is the second refractive index of the second electrode layer (50))

[0242] When the second refractive index (n2) of the second electrode layer (50) is 1.858, the refractive index (n) according to Equation 5 above s ) can be approximately 1.363.

[0243] Accordingly, the step (S4) of forming an anti-reflection layer (60) on the second electrode layer (50) may include the step of forming the anti-reflection layer (60) with a material having a refractive index closest to 1.363.

[0244] According to the present disclosure, by forming an anti-reflection layer (60) on a second electrode layer (50) including a transparent electrode (51), light incident from the outside can be reduced by reflecting light.

[0245] According to the present disclosure, by determining the first thickness (d1, see FIG. 4) of the anti-reflection layer (60) to be a thickness that minimizes or reduces interference that may occur due to the second electrode layer (50) including the transparent electrode (51) and forming it on the second electrode layer (50), the black visual effect of the display device (1) can be improved.

[0246] Hereinafter, a method for manufacturing a display device (1) capable of implementing various reflective colors of the display device (1) according to the present disclosure is described.

[0247] Referring again to FIG. 6, in various embodiments, a method for manufacturing a display device (1) may include the step of selecting a second thickness (d2, see FIG. 4) of a second electrode layer (50) including a transparent electrode (51) and a first thickness (d1, see FIG. 4) of an anti-reflection layer (60) in order to implement a reflective color of the display device (1) in various colors.

[0248] In one embodiment, a method for manufacturing a display device (1) may include the steps of selecting the thickness of an anti-reflection layer (60) as a first thickness and selecting the thickness of a second electrode layer (50) as a second thickness in order to make the reflective color of the display device (1) a first color, and selecting the thickness of the anti-reflection layer (60) as a first thickness and selecting the thickness of the second electrode layer (50) as a third thickness different from the second thickness in order to make the reflective color of the display device (1) a second color different from the first color.

[0249] For example, a method for manufacturing a display device (1) may include the step of selecting the thickness of the anti-reflection layer (60) to 70 nm and the thickness of the transparent electrode (51) to 200 nm in order to make the reflective color of the display device (1) one color, and the step of selecting the thickness of the anti-reflection layer (60) to 70 nm and the thickness of the transparent electrode (51) to 300 nm in order to make the reflective color of the display device (1) three colors.

[0250] In one embodiment, a method for manufacturing a display device (1) may include the steps of selecting the thickness of an anti-reflection layer (60) as a first thickness and selecting the thickness of a second electrode layer (50) as a second thickness in order to make the reflective color of the display device (1) a first color, and selecting the thickness of the anti-reflection layer (60) as a third thickness different from the first thickness and selecting the thickness of the second electrode layer (50) as a second thickness in order to make the reflective color of the display device (1) a second color different from the first color.

[0251] For example, a method for manufacturing a display device (1) may include the steps of selecting the thickness of the anti-reflection layer (60) to 70 nm and the thickness of the transparent electrode (51) to 200 nm in order to make the reflective color of the display device (1) one color, and selecting the thickness of the anti-reflection layer (60) to 90 nm and the thickness of the transparent electrode (51) to 200 nm in order to make the reflective color of the display device (1) two colors.

[0252] In one embodiment, a method for manufacturing a display device (1) may include the steps of selecting the thickness of an anti-reflection layer (60) to a first thickness and selecting the thickness of a second electrode layer (50) to a second thickness in order to make the reflective color of the display device (1) a first color, and selecting the thickness of the anti-reflection layer (60) to a third thickness different from the first thickness and selecting the thickness of the second electrode layer (50) to a fourth thickness different from the second thickness in order to make the reflective color of the display device (1) a second color different from the first color.

[0253] For example, a method for manufacturing a display device (1) may include the step of selecting the thickness of the anti-reflection layer (60) to 70 nm and the thickness of the transparent electrode (51) to 200 nm in order to make the reflective color of the display device (1) 1 color, and the step of selecting the thickness of the anti-reflection layer (60) to 80 nm and the thickness of the transparent electrode (51) to 300 nm in order to make the reflective color of the display device (1) 4 colors.

[0254] According to the present disclosure, the reflective color of the display device (1) can be varied by selecting the thickness of the anti-reflection layer (60) and the thickness of the second electrode layer (50) composed of the transparent electrode (51).

[0255] FIG. 9 is an enlarged cross-sectional view of one side of a display device according to one embodiment.

[0256] Referring to FIG. 9, a method for manufacturing a display device (1) according to one embodiment may include the step of forming an optical film (70) on an anti-reflection layer (60).

[0257] The optical film (70) can ensure that the anti-reflection layer (60) and the second electrode layer (50) are firmly fixed.

[0258] The optical film (70) may be composed of a material capable of preventing corrosion of the anti-reflection layer (60) and the second electrode layer (50).

[0259] The optical film (70) may be composed of a film in the form of OCA (Optically Clear Adhesive) or OCR (Optically Clear Resin).

[0260] FIGS. 10 and 11 illustrate an example in which a transparent electrode and a cathode are electrically contacted according to one embodiment.

[0261] Referring to FIGS. 10 and 11, a transparent electrode (51) and a cathode (32) according to one embodiment can be electrically contacted.

[0262] Referring to FIG. 10, the transparent electrode (51) can be electrically contacted with the negative electrode (32) provided on the substrate (20).

[0263] For example, the transparent electrode (51) may have a shape inclined toward the substrate (20) (e.g., 51a in FIG. 10). Additionally, the transparent electrode (51) may have a region that is electrically in contact with the cathode (32) provided on the substrate (20) (e.g., 51b in FIG. 10).

[0264] The transparent electrode (51) provided on the second electrode layer (50) can be electrically contacted with the cathode (32) provided on the substrate (20) through a shape inclined toward the substrate (20) of the transparent electrode (51) (e.g., 51a in FIG. 10) and a region that is electrically contacted with the cathode (32) provided on the substrate (20) (e.g., 51b in FIG. 10).

[0265] Referring to FIG. 11, a cathode (32) according to one embodiment can be electrically contacted with a transparent electrode (51) provided in a second electrode layer (50).

[0266] For example, the negative electrode (32) may be provided on a separate wiring layer (80) rather than on the substrate (20) and may be electrically contacted with a transparent electrode (51) provided on the second electrode layer (50). The wiring layer (80) may include a layer on which wiring is provided to transmit a signal for supplying a driving current to a thin film transistor (TFT) placed on the substrate (20).

[0267] That is, referring to FIG. 10 and FIG. 11, the display device (1) according to the present disclosure can electrically contact the transparent electrode (51) and the negative electrode (32) even if the connector (150) is omitted.

[0268] As described above, the disclosed embodiments have been explained with reference to the attached drawings. Those skilled in the art will understand that the present invention may be practiced in forms different from the disclosed embodiments without changing the technical spirit or essential features of the invention. The disclosed embodiments are illustrative and should not be interpreted restrictively.

Claims

1. Substrate; A first electrode layer provided on the above substrate; A second electrode layer provided on the first electrode layer and including a transparent electrode; A light-emitting layer provided between the first electrode layer and the second electrode layer and comprising a plurality of vertical light-emitting elements; and A display device comprising: an anti-reflection layer provided on the second electrode layer.

2. In Paragraph 1, The above anti-reflection layer is, The above substrate has a first thickness in the vertical direction and a first refractive index, The second electrode layer above is, The above substrate has a second thickness in the vertical direction and a second refractive index, The above first thickness is, A display device based on the first refractive index, the second thickness, and the second refractive index.

3. In Paragraph 2, The above first thickness is, A display device based on the following Equation 1 or the following Equation 2. [Equation 1] (d1 is the first thickness, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3) [Equation 2] (d1 is the first thickness, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3) 4. In Paragraph 3, Based on the fact that the refractive index of the light-emitting layer is smaller than the second refractive index, The above first thickness is, A display device determined based on the above Equation 1.

5. In Paragraph 3, Based on the fact that the refractive index of the light-emitting layer is greater than the second refractive index, The above first thickness is, A display device determined based on the above Equation 2.

6. In Paragraph 1, The above anti-reflection layer is, A display device directly laminated on the second electrode layer.

7. In Paragraph 1, The above light-emitting layer is, A connector that electrically connects the transparent electrode and the first electrode layer; further comprising The first electrode layer above is, It includes at least one positive electrode electrically in contact with the first electrode of the plurality of vertical light-emitting elements and at least one negative electrode electrically in contact with the connector, The above transparent electrode is, A display device electrically in contact with the second electrode of the plurality of vertical light-emitting elements.

8. In Paragraph 7, The above connector is, A display device comprising a first connector electrode electrically in contact with the transparent electrode and a second connector electrode electrically in contact with at least one negative electrode.

9. A step of forming a first electrode layer on a substrate; A step of forming a light-emitting layer including a plurality of vertical light-emitting elements on the first electrode layer; A step of forming a second electrode layer including a transparent electrode on the light-emitting layer; and A method for manufacturing a display device comprising the step of forming an anti-reflection layer on the second electrode layer.

10. In Paragraph 9, The step of forming the anti-reflection layer on the second electrode layer is: The method includes the step of forming the anti-reflection layer on the second electrode layer with a first thickness in the vertical direction of the substrate; The step of forming the second electrode layer on the light-emitting layer is The method includes the step of forming the second electrode layer on the light-emitting layer with a second thickness in the vertical direction of the substrate; The above anti-reflection layer is, Having the first refractive index, The second electrode layer above is, Having a second refractive index, The above first thickness is, A method for manufacturing a display device determined based on the first refractive index, the second thickness, and the second refractive index.

11. In Paragraph 10, The above first thickness is, A method for manufacturing a display device determined based on the following Equation 1 or Equation 2. [Equation 1] (d1 is the first refractive index, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3) [Equation 2] (d1 is the first refractive index, n2 is the second refractive index, d2 is the second thickness, n1 is the first refractive index, m is 1, 2 or 3) 12. In Paragraph 11, Based on the fact that the refractive index of the light-emitting layer is smaller than the second refractive index, The above first thickness is, A method for manufacturing a display device determined based on the above Equation 1.

13. In Paragraph 11, Based on the fact that the refractive index of the light-emitting layer is greater than the second refractive index, The above first thickness is, A method for manufacturing a display device determined based on the above Equation 2.

14. In Paragraph 9, A step of forming the second electrode layer on the light-emitting layer; and The step of forming the anti-reflection layer on the second electrode layer is: To make the reflection color of the display device the first color, the step of selecting the thickness of the anti-reflection layer to the first thickness, selecting the thickness of the second electrode layer to the first thickness, and selecting the thickness of the second electrode layer to the second thickness; and A method for manufacturing a display device comprising the step of selecting the thickness of the anti-reflection layer to the first thickness and selecting the thickness of the second electrode layer to the third thickness different from the second thickness in order to make the reflection color of the display device a second color different from the first color.

15. In Paragraph 9, A step of forming the second electrode layer on the light-emitting layer; and The step of forming the anti-reflection layer on the second electrode layer is: To make the reflection color of the display device the first color, the step of selecting the thickness of the anti-reflection layer to the first thickness, selecting the thickness of the second electrode layer to the first thickness, and selecting the thickness of the second electrode layer to the second thickness; and A method for manufacturing a display device comprising the step of selecting the thickness of the anti-reflection layer to a third thickness different from the first thickness and selecting the thickness of the second electrode layer to the second thickness in order to make the reflective color of the display device a second color different from the first color.

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