Display device and electronic device

Abstract

The display device of the present invention includes a display panel comprising a light-emitting element and a cover window disposed on the display panel, comprising a flat portion and a bending portion bent from the edge of the flat portion. The cover window includes a base layer and an anti-reflection layer disposed on the base layer, comprising a high-refractive index layer and a low-refractive index layer disposed on the high-refractive index layer. In the range where the wavelength of light is 380 nm or more and 450 nm or less and 500 nm or more and 580 nm or less, the reflectance of the anti-reflection layer decreases as the wavelength increases.

Description

Technology Field

[0001] The present invention relates to a display device and an electronic device, and more specifically to a display device and an electronic device with improved reliability. Background Technology

[0002] Various electronic devices, such as televisions, mobile phones, tablet computers, and game consoles, are being developed. These electronic devices include display devices that generate images and detect input. Display devices include multiple layers with different refractive indices to improve display quality. While layers with lower refractive indices can improve display quality by reducing reflectivity, they exhibit characteristics such as poor hardness and scratch resistance. The problem to be solved

[0003] The present invention aims to improve the display quality of a cover window included in a display device and an electronic device. means of solving the problem

[0004] A display device according to one embodiment of the present invention includes a display panel comprising a light-emitting element and a cover window disposed on the display panel, comprising a flat portion and a bending portion bent from the edge of the flat portion. The cover window includes a base layer and an anti-reflection layer disposed on the base layer, comprising a high refractive index layer and a low refractive index layer disposed on the high refractive index layer. In the range where the wavelength of light is 380 nm or more and 450 nm or less and 500 nm or more and 580 nm or less, the reflectance of the anti-reflection layer may decrease as the wavelength increases.

[0005] A display device according to one embodiment of the present invention includes a display panel comprising a light-emitting element and a cover window disposed on the display panel. The cover window comprises a base layer and an anti-reflection layer disposed on the base layer, the first refractive layer having different refractive indices, a second refractive layer disposed below the first refractive layer, and a third refractive layer disposed below the second refractive layer. The second refractive layer has a greater refractive index than the first refractive layer and the third refractive layer, the first thickness of the first refractive layer is greater than the second thickness of the second refractive layer, and the second thickness of the second refractive layer is greater than the third thickness of the third refractive layer.

[0006] An electronic device according to one embodiment of the present invention includes a display device having a defined module area and an electronic module arranged to correspond to the module area. The display device includes a display panel including a light-emitting element and a cover window disposed on the display panel, comprising a flat portion and a bending portion bent from the edge of the flat portion. The cover window includes a base layer and an anti-reflection layer disposed on the base layer, comprising a high-refractive index layer and a low-refractive index layer disposed on the high-refractive index layer. In the range where the wavelength of light is 380 nm or more and 450 nm or less and 500 nm or more and 580 nm or less, the reflectance of the anti-reflection layer may decrease as the wavelength increases. Effects of the invention

[0007] The cover window of the present invention may have different thicknesses for the flat portion and the bending portion. Even if the thickness of the bending portion is smaller than the thickness of the flat portion, the tristimulus value is constant so that the color difference between the flat portion and the bending portion is reduced, thereby providing a cover window with improved display quality. Brief explanation of the drawing

[0008] FIG. 1 is a perspective view of an electronic device according to one embodiment of the present invention. Figure 2 is an exploded perspective view of the electronic device shown in Figure 1. FIG. 3 is a cross-sectional view of a display device according to an embodiment of the present invention showing a portion corresponding to the line I-I' of FIG. 2. FIG. 4 is a cross-sectional view of a part of a display panel according to one embodiment of the present invention. FIG. 5a is a cross-sectional view of a display device according to an embodiment of the present invention showing a portion corresponding to line II-II' of FIG. 2. Figure 5b is an enlarged view of the AA' region of Figure 5a. FIGS. 6a to 6c are drawings showing graphs for explaining Example 2 described in Table 1. FIGS. 7a to 7c are drawings showing graphs for explaining Example 1 described in Table 1. FIGS. 8a to 8c are drawings showing graphs for explaining Example 3 described in Table 1. Specific details for implementing the invention

[0009] The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0010] In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly placed / connected / combined with the other component, or that a third component may be placed between them.

[0011] Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective illustration of the technical content.

[0012] "And / or" includes all one or more combinations that the associated configurations can define.

[0013] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0014] Additionally, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings.

[0015] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Additionally, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and are explicitly defined herein unless interpreted in an ideal or overly formal sense.

[0016] Terms such as "include" or "have" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0019] FIG. 1 is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of the electronic device shown in FIG. 1.

[0020] The electronic device (ED) of one embodiment illustrated in FIG. 1 may be a device that is activated according to an electrical signal. For example, the electronic device (ED) may be a personal computer, a laptop computer, a personal digital terminal, a game console, a portable electronic device, a television, a monitor, an external billboard, a car navigation system, or a wearable device, but the embodiment is not limited thereto. FIG. 1 illustrates the electronic device (ED) as a smartphone as an example.

[0021] A display area may be defined in the electronic device (ED). The electronic device (ED) can display an image through the display area and receive external input. The display area of ​​the electronic device (ED) may include a main display area (DA-M) and first to fourth sub-display areas (DA-S1, DA-S2, DA-S3, DA-S4).

[0022] The main display area (DA-M) may be substantially parallel to the plane defined by the first direction (DR1) and the second direction (DR2). However, not limited thereto, the main display area (DA-M) may have a shape that is concave or convex with respect to the plane defined by the first direction (DR1) and the second direction (DR2).

[0023] The main display area (DA-M) can display an image toward a third direction (DR3) that intersects the first direction (DR1) and the second direction (DR2), respectively. The third direction (DR3) can be defined as the thickness direction of the electronic device (ED). The front (or top) and back (or bottom) surfaces of each component constituting the electronic device (ED) can be opposite each other in the third direction (DR3).

[0024] In this specification, "in a plane" may be defined as a state viewed from a third direction (DR3). In this specification, "in a cross-section" may be defined as a state viewed from a first direction (DR1) or a second direction (DR2). Meanwhile, the directions indicated by the first to third directions (DR1, DR2, DR3) are relative concepts and can be converted to other directions.

[0025] The main display area (DA-M) may have a rectangular shape having short sides extended in the first direction (DR1) and long sides extended in the second direction (DR2). However, it is not limited thereto, and the main display area (DA-M) may have various shapes such as a circle or a polygon on a plane.

[0026] The main display area (DA-M) may include a sub-area (MH). However, this is exemplary, and the arrangement of the sub-area (MH) is not limited to any one embodiment. Although one sub-area (MH) is shown in FIG. 1, etc., multiple sub-areas (MH) may be provided.

[0027] Various electronic modules (ELM, FIG. 2) may be arranged to correspond to a sub-region (MH). For example, an electronic module (ELM, FIG. 2) may include at least one of a camera, a speaker, a light sensing sensor, and a heat sensing sensor. An electronic device (ED) may include an electronic module (ELM, FIG. 2) that captures an external image through visible light passing through the sub-region (MH) or determines the accessibility of an external object through infrared light. An electronic module (ELM, FIG. 2) may include a plurality of configurations and is not limited to any one embodiment.

[0028] Each of the first to fourth sub-display regions (DA-S1, DA-S2, DA-S3, DA-S4) can be bent from the main display region (DA-M). Each of the first to fourth sub-display regions (DA-S1, DA-S2, DA-S3, DA-S4) can be bent with curvature and may include a curved surface. The curvatures of the first to fourth sub-display regions (DA-S1, DA-S2, DA-S3, DA-S4) may be the same as each other, but are not limited thereto, and at least some of them may be different from each other.

[0029] The main display area (DA-M) and the first to fourth sub-display areas (DA-S1, DA-S2, DA-S3, DA-S4) can be adjacent to each other to form a continuous display area. The first sub-display area (DA-S1) and the third sub-display area (DA-S3) can each be extended from the long sides of the main display area (DA-M) parallel to the second direction (DR2), and the second sub-display area (DA-S2) and the fourth sub-display area (DA-S4) can each be extended from the short sides of the main display area (DA-M) parallel to the first direction (DR1).

[0030] Each of the first sub-display area (DA-S1) and the third sub-display area (DA-S3) extends along the second direction (DR2) and can be spaced apart in the first direction (DR1) with the main display area (DA-M) in between. Each of the second sub-display area (DA-S2) and the fourth sub-display area (DA-S4) extends along the first direction (DR1) and can be spaced apart in the second direction (DR2) with the main display area (DA-M) in between.

[0031] FIG. 1 illustrates, exemplarily, four sub-display areas (DA-S1, DA-S2, DA-S3, DA-S4) extended from four sides of a main display area (DA-M), but is not limited thereto, and the display area of ​​the display device (DD) may include a bent sub-display area extended from at least one of the four sides of the main display area (DA-M). For example, the display device (DD) according to one embodiment may include only some of the four sub-display areas (DA-S1, DA-S2, DA-S3, DA-S4).

[0032] The electronic device (ED) may include first to fourth display corner portions (C1, C2, C3, C4) disposed between first to fourth sub-display areas (DA-S1, DA-S2, DA-S3, DA-S4). The first to fourth sub-display areas (DA-S1, DA-S2, DA-S3, DA-S4) and the first to fourth display corner portions (C1, C2, C3, C4) may be connected to each other to surround a main display area (DA-M).

[0033] The first display corner portion (C1) is positioned between the first sub-display area (DA-S1) and the second sub-display area (DA-S2), and may be a portion having curvature that connects the first sub-display area (DA-S1) and the second sub-display area (DA-S2) extended in a direction intersecting each other. The second display corner portion (C2) is positioned between the second sub-display area (DA-S2) and the third sub-display area (DA-S3), and may be a portion having curvature that connects the second sub-display area (DA-S2) and the third sub-display area (DA-S3) extended in a direction intersecting each other. The third display corner portion (C3) is positioned between the third sub-display area (DA-S3) and the fourth sub-display area (DA-S4), and may be a portion having curvature that connects the third sub-display area (DA-S3) and the fourth sub-display area (DA-S4) extended in a direction intersecting each other. The fourth display corner portion (C4) is positioned between the fourth sub-display area (DA-S4) and the first sub-display area (DA-S1), and may be a portion having curvature that connects the fourth sub-display area (DA-S4) and the first sub-display area (DA-S1) extended in a direction intersecting each other.

[0034] The first to fourth display corner portions (C1, C2, C3, C4) can each correspond to the corners of the electronic device (ED). Since the first to fourth display corner portions (C1, C2, C3, C4) each have a curvature, the corners of the electronic device (ED) can have a rounded shape without being angular.

[0035] Referring to FIG. 2, the electronic device (ED) may include a display device (DD) and an electronic module (ELM). The display device (DD) may include a display module (DM) and a cover window (CW) disposed on the display module (DM). Additionally, the electronic device (ED) may further include a housing (HAU) in which the display module (DM) is housed. The display device (DD) may have a defined module area (DM-MH), and the electronic module (ELM) may be disposed to correspond to the module area (DM-MH).

[0036] In the electronic device (ED) illustrated in FIGS. 1 and 2, a cover window (CW) and a housing (HAU) may be combined to form the exterior of the electronic device (ED). The housing (HAU) may be positioned below the display module (DM). The housing (HAU) may comprise a material having relatively high rigidity. For example, the housing (HAU) may comprise a plurality of frames and / or plates made of glass, plastic, or metal. The housing (HAU) may provide a predetermined receiving space. The display module (DM) may be received within the receiving space and protected from external impact.

[0037] A cover window (CW) can be placed on a display module (DM). The cover window (CW) can be combined with a display panel (DP) through a lamination process. The cover window (CW) can cover the display module (DM) to protect the display module (DM) from external impacts and scratches.

[0038] The cover window (CW) may include an optically transparent insulating material. For example, the cover window (CW) may include a base film comprising glass or a synthetic resin. The cover window (CW) may have a single-layer or multi-layer structure. For example, a multi-layer cover window (CW) may include synthetic resin films bonded with an adhesive, or a glass film and a synthetic resin film bonded with an adhesive. The cover window (CW) may further include functional layers, such as an anti-fingerprint layer, a phase control layer, and a hard coating layer, disposed on the base film.

[0039] The cover window (CW) may include a transparent area, and the transparent area of ​​the cover window (CW) may correspond to the main display area (DA-M) shown in FIG. 1. The transparent area of ​​the cover window (CW) may transmit an image output from the display module (DM), and the user may see it from outside the electronic device (ED). The cover window (CW) may include a main transparent surface (TA-M) and first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4).

[0040] The main transparent plane (TA-M) may correspond to the main display area (DA-M) illustrated in FIG. 1. The main transparent plane (TA-M) may include a plane substantially parallel to the plane defined by the first direction (DR1) and the second direction (DR2).

[0041] Each of the first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4) may be bent with curvature from the main transparent surface (TA-M). Accordingly, each of the first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4) may include a curved surface extending from the main transparent surface (TA-M). The first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4) may each correspond to the first to fourth sub-display regions (DA-S1, DA-S2, DA-S3, DA-S4) illustrated in FIG. 1.

[0042] The main transparent surface (TA-M) and the first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4) can be adjacent to each other to form a continuous transparent area. Each of the first side transparent surface (TA-S1) and the third side transparent surface (TA-S3) extends along the second direction (DR2) and can be spaced apart in the first direction (DR1) with the main transparent surface (TA-M) in between. Each of the second side transparent surface (TA-S2) and the fourth side transparent surface (TA-S4) extends along the first direction (DR1) and can be spaced apart in the second direction (DR2) with the main transparent surface (TA-M) in between.

[0043] The cover window (CW) may include first to fourth window corner portions (W-C1, W-C2, W-C3, W-C4) disposed between the first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4). The first to fourth window corner portions (W-C1, W-C2, W-C3, W-C4) may substantially correspond to the first to fourth display corner portions (C1, C2, C3, C4) of the display device (DD) illustrated in FIG. 1. The first to fourth side transparent surfaces (TA-S1, TA-S2, TA-S3, TA-S4) and the first to fourth window corner portions (W-C1, W-C2, W-C3, W-C4) may be connected to each other to surround the main transparent surface (TA-M).

[0044] The first window corner section (W-C1) can connect the first side transparent surface (TA-S1) and the second side transparent surface (TA-S2) that are extended in directions intersecting each other. The second window corner section (W-C2) can connect the second side transparent surface (TA-S2) and the third side transparent surface (TA-S3) that are extended in directions intersecting each other. The third window corner section (W-C3) can connect the third side transparent surface (TA-S3) and the fourth side transparent surface (TA-S4) that are extended in directions intersecting each other. The fourth window corner section (W-C4) can connect the fourth side transparent surface (TA-S4) and the first side transparent surface (TA-S1) that are extended in directions intersecting each other. Each of the first to fourth window corner sections (W-C1, W-C2, W-C3, W-C4) may be a portion having curvature.

[0045] The first side transparent surface (TA-S1) and the third side transparent surface (TA-S3) can each be bent with the same curvature. The second side transparent surface (TA-S2) and the fourth side transparent surface (TA-S4) can each be bent with the same curvature. The first side transparent surface (TA-S1) and the third side transparent surface (TA-S3) can each have a different curvature from the second side transparent surface (TA-S2) and the fourth side transparent surface (TA-S4), respectively. Accordingly, each of the window corner sections (W-C1, W-C2, W-C3, W-C4) can be formed into a double-curved section with different curvatures by connecting the first and third side transparent surfaces (TA-S1, TA-S3) that extend in the second direction (DR2) and define the long sides of the cover window (CW), and the second and fourth side transparent surfaces (TA-S2, TA-S4) that extend in the first direction (DR1) and define the short sides of the cover window (CW).

[0046] The display module (DM) can be activated according to an electrical signal. The display module (DM) can be activated to display an image on the main display area (DA-M, see FIG. 1) of the electronic device (ED). The display module (DM) may have an active area (DM-AA), a peripheral area (DM-NAA), and a module area (DM-MH) defined therein.

[0047] The active area (DM-AA) may be an area that is activated according to an electrical signal. A pixel (PX) may be disposed in the active area (DM-AA). The pixel (PX) may include a transistor (TR, see FIG. 4) and a light-emitting element (OLED, see FIG. 4) described later. The peripheral area (DM-NAA) may be an area located adjacent to at least one side of the active area (DM-AA). Circuits or wiring for driving the active area (DM-AA) may be disposed in the peripheral area (DM-NAA).

[0048] The module area (DM-MH) may correspond to the sub-area (MH) illustrated in FIG. 1. Optical signals, such as visible light or infrared light, may travel to the module area (DM-MH). The module area (DM-MH) may be placed within the active area (DM-AA). Alternatively, the module area (DM-MH) may be surrounded by the surrounding area (DM-NAA), or surrounded by the active area (DM-AA) and the surrounding area (DM-NAA).

[0049] The electronic module (ELM) may be an electronic component that outputs or receives an optical signal. The electronic module (ELM) may include a camera module and / or a proximity sensor. The camera module may capture an external image through the module area (DM-MH).

[0050] Although not illustrated, the display device (DD) may further include an optical layer disposed between the display module (DM) and the cover window (CW). The optical layer may be formed on the display module (DM) through a continuous process. The optical layer may include a polarizer or a color filter layer. For example, the optical layer may include at least one of a phase retarder, a polarizer, a polarizing film, and a polarizing filter. Alternatively, the optical layer may include a plurality of color filters arranged in a predetermined array. For example, the color filters may be arranged considering the emission colors of the pixels (PX). Additionally, the optical layer may further include a black matrix adjacent to the color filters.

[0051] FIG. 3 is a cross-sectional view of a display device according to an embodiment of the present invention showing a portion corresponding to the line I-I' of FIG. 2. In FIG. 3, the housing (HAU, FIG. 2) has been omitted for convenience of explanation.

[0052] Referring to FIG. 3, the display module (DM) may include a display panel (DP) and an input detection unit (TP) disposed on the display panel (DP). The display panel (DP) may be a configuration that substantially generates an image.

[0053] The display panel (DP) may include a base substrate (BS), a circuit element layer (DP-CL), a display element layer (DP-ED), and an encapsulation layer (TFE) stacked sequentially. Unlike what is illustrated, a separate member may be additionally disposed between two adjacent layers among the base substrate (BS), the circuit element layer (DP-CL), the display element layer (DP-ED), and the encapsulation layer (TFE).

[0054] The base substrate (BS) can provide a base surface on which the circuit element layer (DP-CL) is disposed. The base substrate (BS) may be a flexible substrate capable of bending, folding, rolling, etc. The base substrate (BS) may be a glass substrate, a metal substrate, or a polymer substrate, etc. However, the embodiments are not limited thereto, and the base substrate (BS) may include an inorganic layer, an organic layer, or a composite material layer.

[0055] A circuit element layer (DP-CL) may be disposed on a base substrate (BS). The circuit element layer (DP-CL) may include an insulating layer, a semiconductor pattern, a conductive pattern, and a signal line, etc. A display element layer (DP-ED) may be disposed on the circuit element layer (DP-CL). The display element layer (DP-ED) may include a light-emitting element (OLED, FIG. 4) described later. For example, the light-emitting element (OLED, FIG. 4) may include an organic light-emitting material, an inorganic light-emitting material, an organic-inorganic light-emitting material, a quantum dot, or a quantum rod. For example, the light-emitting element (OLED, FIG. 4) may include a micro LED or a nano LED.

[0056] The encapsulation layer (TFE) may be disposed on the display element layer (DP-ED). The encapsulation layer (TFE) can protect the display element layer (DP-ED) from foreign substances such as moisture, oxygen, and dust particles. The encapsulation layer (TFE) may include at least one inorganic layer. For example, the encapsulation layer (TFE) may include an inorganic layer, an organic layer, and an inorganic layer stacked sequentially.

[0057] The input sensing unit (TP) may be placed on the display panel (DP). The input sensing unit (TP) may be placed directly on the encapsulation layer (TFE). Alternatively, an adhesive member may be placed between the input sensing unit (TP) and the display panel (DP).

[0058] In this specification, the statement that one component is directly placed / provided / formed on another component means that a third component is not placed / provided / formed between one component and another component. That is, the statement that one component is 'directly placed / provided / formed' on another component means that one component and another component are in 'contact'.

[0059] The input detection unit (TP) can detect an external input, convert it into a predetermined input signal, and provide the input signal to the display panel (DP). For example, the input detection unit (TP) may be a touch detection unit that detects a touch. The input detection unit (TP) may recognize a user's direct touch, a user's indirect touch, a direct touch of an object, or an indirect touch of an object.

[0060] The input sensing unit (TP) can detect at least one of the position of a touch applied from the outside and the intensity (pressure) of the touch. In one embodiment, the input sensing unit (TP) may have various structures or be composed of various materials and is not limited to any one embodiment. For example, the input sensing unit (TP) can detect an external input in a capacitive manner. The display panel (DP) receives an input signal from the input sensing unit (TP) and can generate an image corresponding to the input signal.

[0061] The display device (DD) may further include an adhesive layer (AP-C) disposed between the display module (DM) and the cover window (CW). The display module (DM) and the cover window (CW) may be joined by the adhesive layer (AP-C). The adhesive layer (AP-C) may include a pressure-sensitive adhesive (PSA), an optically clear adhesive film (OCA), or an optically clear adhesive resin layer (OCR). However, this is exemplary and the embodiments are not limited thereto. Unlike what is illustrated, the adhesive layer (AP-C) may be omitted.

[0062] FIG. 4 is a cross-sectional view of a portion of a display panel according to an embodiment of the present invention. FIG. 4 illustrates the configuration of the display panel (DP) in more detail compared to FIG. 3. Hereinafter, content that overlaps with FIG. 3 will be omitted.

[0063] A display panel (DP) may include a plurality of pixels. Each pixel may include at least one transistor (TR) and a light-emitting element (OLED). FIG. 4 illustrates an exemplary region in which one of the pixels of the display panel (DP) has a transistor (TR) and a light-emitting element (OLED) placed. Referring to FIG. 4, the display panel (DP) may include a base substrate (BS), a circuit element layer (DP-CL), a display element layer (DP-ED), and an encapsulation layer (TFE).

[0064] A base substrate (BS) can provide a base surface on which a circuit element layer (DP-CL) is placed. The base substrate (BS) may include a synthetic resin layer. After forming a synthetic resin layer on a support substrate used in the manufacture of a display panel (DP), a conductive layer and an insulating layer, etc., can be formed on the synthetic resin layer. After that, the support substrate can be removed, and the synthetic resin layer from which the support substrate has been removed can correspond to the base substrate (BS).

[0065] At least one inorganic layer may be disposed on the upper surface of the base substrate (BS). The inorganic layer may constitute a barrier layer and / or a buffer layer. FIG. 4 illustrates an exemplary buffer layer (BFL) disposed on the base substrate (BS). The buffer layer (BFL) can improve the bonding strength between the base substrate (BS) and the semiconductor pattern of the circuit element layer (DP-CL).

[0066] The circuit element layer (DP-CL) may be disposed on the buffer layer (BFL). The circuit element layer (DP-CL) may include at least one insulating layer and a circuit element. The circuit element may include a signal line, a pixel driving circuit, etc. The circuit element layer (DP-CL) may be formed through a process of forming an insulating layer, a semiconductor layer, and a conductive layer by coating, deposition, etc., and a patterning process of the insulating layer, the semiconductor layer, and the conductive layer by photolithography.

[0067] In this embodiment, the circuit element layer (DP-CL) may include a transistor (TR), a connection signal line (SCL), connection electrodes (CNE1, CNE2), and a plurality of insulating layers (10 to 60). The plurality of insulating layers (10 to 60) may include first to sixth insulating layers (10 to 60) sequentially stacked on a buffer layer (BFL). Each of the first to sixth insulating layers (10 to 60) may include either an inorganic layer or an organic layer.

[0068] A transistor (TR) may include a semiconductor pattern comprising a source region (Sa), an active region (Aa), and a drain region (Da), and a gate electrode (Ga). The semiconductor pattern of the transistor (TR) may include polysilicon. However, it is not limited thereto, and the semiconductor pattern may include amorphous silicon or a metal oxide.

[0069] A semiconductor pattern can be divided into multiple regions based on conductivity. For example, the electrical properties of a semiconductor pattern may vary depending on whether it is doped or metal oxide reduced. Regions with high conductivity within the semiconductor pattern can serve as electrodes or signal lines, which may correspond to the source region (Sa) and drain region (Da) of a transistor (TR). Regions that are un-doped or un-reduced and have relatively low conductivity may correspond to the active region (Aa) (or channel region) of the transistor (TR).

[0070] A connection signal line (SCL) can be formed from a semiconductor pattern and can be placed on the same layer as the source region (Sa), active region (Aa), and drain region (Da) of a transistor (TR). According to one embodiment, the connection signal line (SCL) can be electrically connected to the drain region (Da) of the transistor (TR) on a plane.

[0071] The first insulating layer (10) can cover the semiconductor pattern of the circuit element layer (DP-CL). A gate electrode (Ga) can be placed on the first insulating layer (10). The gate electrode (Ga) can be superimposed on the active region (Aa) in a planar plane. The gate electrode (Ga) can function as a mask in the process of doping the semiconductor pattern. An upper electrode (UE) can be placed on the second insulating layer (20). The upper electrode (UE) can be superimposed on the gate electrode (Ga) in a planar plane.

[0072] The first connecting electrode (CNE1) and the second connecting electrode (CNE2) are placed between the transistor (TR) and the light-emitting element (OLED) to electrically connect the transistor (TR) and the light-emitting element (OLED). The first connecting electrode (CNE1) is placed on the third insulating layer (30) and can be connected to a connecting signal line (SCL) through a contact hole (CNT-1) that penetrates the first to third insulating layers (10 to 30). The second connecting electrode (CNE2) is placed on the fifth insulating layer (50) and can be connected to the first connecting electrode (CNE1) through a contact hole (CNT-2) that penetrates the fourth and fifth insulating layers (40, 50).

[0073] A display element layer (DP-ED) may be disposed on a circuit element layer (DP-CL). The display element layer (DP-ED) may include a light-emitting element (OLED) and a pixel definition film (PDL). The light-emitting element (OLED) may include a first electrode (AE), a second electrode (CE), and an intermediate layer disposed between the first electrode (AE) and the second electrode (CE). The first electrode (AE) and the second electrode (CE) may be made of a conductive material. The intermediate layer may include at least one organic layer, and in this embodiment, the intermediate layer is illustrated as including a hole control layer (HCL), a light-emitting layer (EML), and an electronic control layer (ECL). However, this is illustrated as an example, and the intermediate layer may include additional layers in addition to the hole control layer (HCL), the light-emitting layer (EML), and the electronic control layer (ECL), or at least one of the hole control layer (HCL), the light-emitting layer (EML), and the electronic control layer (ECL) may be omitted, and is not limited to any one embodiment.

[0074] The first electrode (AE) and the pixel defining film (PDL) may be disposed on the sixth insulating layer (60). The first electrode (AE) may be connected to the second connecting electrode (CNE2) through a contact hole (CNT-3) penetrating the sixth insulating layer (60). The pixel defining film (PDL) may be defined with a light-emitting opening (OP-PX) that exposes at least a portion of the first electrode (AE), and the portion of the first electrode (AE) exposed by the light-emitting opening (OP-PX) may correspond to a light-emitting region (PXA). A non-light-emitting region (NPXA) may surround the light-emitting region (PXA).

[0075] The hole control layer (HCL) and the electron control layer (ECL) can be placed in common in the emitting region (PXA) and the non-emitting region (NPXA). The emitting layer (EML) can be formed in a patterned shape corresponding to the emitting aperture (OP-PX). The patterned emitting layer (EML) can be formed using a deposition device.

[0076] The light-emitting layer (EML) can be deposited in a different manner compared to the film-type hole control layer (HCL) and electronic control layer (ECL). For example, the hole control layer (HCL) and electronic control layer (ECL) can be formed commonly across pixels using a mask referred to as an open mask. The light-emitting layer (EML) can be formed differently for each pixel using a mask referred to as a fine metal mask (FMM).

[0077] The encapsulation layer (TFE) may include a plurality of thin films. In one embodiment, the encapsulation layer (TFE) may include first to third thin films (EN1, EN2, EN3) stacked sequentially. Each of the first to third thin films (EN1, EN2, EN3) may include either an inorganic film or an organic film. The inorganic film may protect the light-emitting element (OLED) from moisture and / or oxygen. The organic film may protect the light-emitting element (OLED) from foreign substances such as dust particles. However, as long as it can protect the light-emitting element (OLED) or improve light emission efficiency, the composition of the encapsulation layer (TFE) is not limited to that illustrated.

[0078] FIG. 5a is a cross-sectional view of a display device according to an embodiment of the present invention showing a portion corresponding to the line II-II' of FIG. 2. FIG. 5b is an enlarged view of the AA' region of FIG. 5a. The AA' region may be an enlarged region of the first portion (PO1) of the anti-reflection layer (RPL).

[0079] Referring to FIG. 5a, the cover window (CW) may include a base layer (BL), an anti-reflective layer (RPL) disposed on the base layer (BL), and a functional layer (FL) disposed on the anti-reflective layer (RPL). Although not illustrated, an adhesive layer may be further disposed between the anti-reflective layer (RPL) and the functional layer (FL). The cover window (CW) of the present invention may include a flat portion (FP) and a bending portion (BP) bent from the edge of the flat portion (FP). The flat portion (FP) corresponds to the main transparent surface (TA-M) shown in FIG. 2, and the bending portion (BP) may correspond to the first side transparent surface (TA-S1) shown in FIG. 2.

[0080] The base layer (BL) may be a member that provides a base surface on which the anti-reflective layer (RPL) is disposed. The base layer (BL) may include glass or a polymer film. For example, the base layer (BL) may be a flexible polymer film. The base layer (BL) may include at least one of polyethylene terephthalate, polyimide, polyacrylate, polymethylmethacrylate, polycarbonate, polyethylenenaphthalate, polyvinylidene chloride, polyvinylidene difluoride, polystyrene, and ethylene vinylalcohol copolymer. However, this is exemplary and the material of the base layer (BL) is not limited thereto.

[0081] The anti-reflection layer (RPL) may have a first portion (PO1) corresponding to a flat portion (FP) and a second portion (PO2) corresponding to a bending portion (BP). The thickness of the first portion (PO1) of the anti-reflection layer (RPL) may be a first thickness (Th1), and the thickness of the second portion (PO2) of the anti-reflection layer (RPL) may be a second thickness (Th2). According to one embodiment of the present invention, the first thickness (Th1) and the second thickness (Th2) may be different from each other. The first thickness (Th1) may be greater than the second thickness (Th2). The anti-reflection layer (RPL) may be formed through a deposition process. Depending on the degree to which the portion of the anti-reflection layer (RPL) corresponding to the bending portion (BP) is bent, the difference between the first thickness (Th1) and the second thickness (Th2) may increase. Specifically, the greater the degree of bending of the portion of the anti-reflection layer (RPL) corresponding to the bending portion (BP), the greater the difference between the first thickness (Th1) and the second thickness (Th2). Accordingly, the reflectance of the portion of the anti-reflection layer (RPL) corresponding to the bending portion (BP) to external light and the reflectance of the portion of the anti-reflection layer (RPL) corresponding to the flat portion (FP) to external light may differ from each other.

[0082] The cover window (CW) may further include an auxiliary layer (not shown) between the base layer (BL) and the anti-reflective layer (RPL). The auxiliary layer (not shown) can increase the bonding strength between the base layer (BL) and the anti-reflective layer (RPL) and improve the mechanical properties (e.g., wear resistance) of the cover window (CW). For example, the auxiliary layer (not shown) may include silicon oxide.

[0083] The functional layer (FL) may include a polymer film. The functional layer (FL) may include at least one of an antistatic agent, a hard coating agent, and an anti-fingerprint agent. For example, the functional layer (FL) may include perfluoropolyether (PFPE). Unlike what is illustrated, the functional layer (FL) may be omitted.

[0084] Referring to FIG. 5b, the anti-reflection layer (RPL) may include a high refractive index layer (HR) and a low refractive index layer (LR). The refractive index of the high refractive index layer (HR) may be 1.7 or higher and 2.5 or lower. The high refractive index layer (HR) may include a nitride containing silicon (Si). For example, the high refractive index layer (HR) may be silicon nitride (SiN X It may include at least one of silicon nitride (SiAlN), aluminum nitride (AlN), germanium dioxide (GeO2), zirconium dioxide (ZrO2), and titanium dioxide (TiO2). However, this is exemplary, and the high refractive index layer (HR) may include, without limitation, materials with high refractive index characteristics known in the art.

[0085] The refractive index of the low refractive index layer (LR) may be 1.3 or greater and 1.7 or less. The low refractive index layer (LR) may comprise an oxide containing silicon (Si) and / or an oxide containing aluminum (Al). For example, the low refractive index layer (LR) may be silicon oxide (SiO₂). X It may include at least one of silicon oxide, aluminum oxide (Al2O3), and silicon oxynitride (SiON). The low refractive index layer (LR) may include silicon dioxide (SiO2). However, the embodiments are not limited thereto, and the low refractive index layer (LR) may further include materials with low refractive index characteristics known in the art.

[0086] The high refractive index layer (HR) consists of a plurality of high refractive index layers (HR1, …HR n It can be provided as ). The low-refractive index layer (LR) may be provided as a plurality of low-refractive index layers (LR1, …LR n+1It can be provided as ). Here, n is an integer greater than or equal to 2. Multiple high-refractive index layers (HR1, …HR n The thickness of each may differ from one another. Multiple low-refractive index layers (LR1, …LR n+1 The thickness of each may differ from one another.

[0087] Multiple high-refractive index layers (HR1, …HR n ) and multiple low-refractive layers (LR1, …LR n+1 An anti-reflective layer (RPL) containing ) can reduce reflectivity through destructive interference due to differences in refractive index. Accordingly, a cover window (CW) containing an anti-reflective layer (RPL) exhibits low reflectivity and can improve the display quality of a display device (DD, see FIG. 2). Multiple high-refractive index layers (HR1, …HR n ) and multiple low-refractive layers (LR1, …LR n+1 ) can be arranged alternately.

[0088] According to one embodiment of the present invention, the anti-reflection layer (RPL) may include a first refractive layer, a second refractive layer disposed below the first refractive layer, and a third refractive layer disposed below the second refractive layer. The first refractive layer may correspond to a first low refractive layer (LR1) disposed at the top of the anti-reflection layer (RPL), the second refractive layer may correspond to a first high refractive layer (HR1) disposed below the first low refractive layer (LR1), and the third refractive layer may correspond to a second low refractive layer (LR2) disposed below the first high refractive layer (HR1).

[0089] According to one embodiment of the present invention, the thickness of the first low-refractive index layer (LR1) may be greater than the thickness of the first high-refractive index layer (HR1) and the second low-refractive index layer (LR2), respectively. Additionally, the thickness of the first high-refractive index layer (HR1) may be greater than the thickness of the second low-refractive index layer (LR2). For example, the thickness of the first low-refractive index layer (LR1) may be 80 nm or more and 100 nm or less, the thickness of the first high-refractive index layer (HR1) may be 50 nm or more and 80 nm or less, and the thickness of the second low-refractive index layer (LR2) may be 5 nm or more and 30 nm or less. The refractive index of the first low-refractive index layer (LR1) may be 1.45 or more and 1.5 or less, the refractive index of the first high-refractive index layer (HR1) may be 1.8 or more and 2.1 or less, and the refractive index of the second low-refractive index layer (LR2) may be 1.45 or more and 1.7 or less.

[0090] According to one embodiment of the present invention, the first low-refractive index layer (LR1) comprises silicon dioxide (SiO2), the first high-refractive index layer (HR1) comprises zirconium dioxide (ZrO2), tantalum pentoxide (Ta2O5), and silicon nitride (Si3N4), and the second low-refractive index layer (LR2) may comprise silicon dioxide (SiO2) and alumina (Al2O3).

[0091] Comparative example Example 1 Example 2 Example 3 Refractive index Thickness (nm) Refractive index Thickness (nm) Refractive index Thickness (nm) Refractive index Thickness (nm) 1st floor 1.48 87 1.48 93 1.48 95 1.47 90 2nd floor 2.05 165 1.89 65 2.05 60 1.98 72 3rd floor 1.48 15 1.61 8 1.48 10 1.64 10 4th floor 2.05 58 1.89 15 2.05 75 1.98 49 5th floor 1.48 13 1.61 25 1.48 45 1.64 20 6th floor 2.05 179 1.89 36 2.05 18 1.98 9 7th floor 1.48 24 1.48 65 1.48 70 1.47 41 8th floor 2.05 33 1.89 10 - - 1.98 15 9th floor 1.48 51 1.48 82 - - 1.47 71 10th floor 2.05 12 - - - - - - R(%) 0.44 0.91 0.86 0.65 Reference color coordinates a* 2.1 0.1 -1 0.1 b* -5.3 -0.9 -0.8 -1.1 Color difference when thickness is reduced by 10% 9 0.8 1.5 0.8 Color difference when thickness is reduced by 20% 14.5 2.3 1.3 1.8

[0092] Table 1 above shows the results of evaluating the cover windows of the comparative example and multiple embodiments. A CM-3700A spectrophotometer (manufactured by Konica Minolta, Inc.) was used for the evaluation of the cover windows. Among the 1st to 10th layers included in the comparative example, the 1st, 3rd, 5th, 7th, and 9th layers are silicon oxide (SiO₂). X It is a low-refractive index layer including ), and the second, fourth, sixth, eighth, and tenth layers are silicon nitride (SiN X It is a high-refractive index layer including ). Each embodiment of the present invention includes some of the layers from the first to the tenth layer, and differs from the comparative example in the refractive index and thickness of each layer.

[0093] For example, referring to Example 2, the thickness of the first layer is 90 nm or more and 100 nm or less, the thickness of the second layer is 50 nm or more and 60 nm or less, the thickness of the third layer is 7 nm or more and 13 nm or less, the thickness of the fourth layer is 70 nm or more and 80 nm or less, the thickness of the fifth layer is 40 nm or more and 50 nm or less, the thickness of the sixth layer is 17 nm or more and 20 nm or less, and the thickness of the seventh layer is 70 nm or more and 90 nm or less. When looking at the ratio of the thickness of each layer based on the second layer (1), the first layer is 1.49 or more and 1.68 or less, the third layer is 0.13 or more and 0.26 or less, the fourth layer is 1.13 or more and 1.37 or less, the fifth layer is 0.72 or more and 0.89 or less, the sixth layer is 0.29 or more and 0.35 or less, and the seventh layer is 1.29 or more and 1.55 or less.

[0094] In addition, in Table 1, R is the reflectance value, and a* and b* are color coordinates, representing the cross-sectional color coordinates. Furthermore, the color difference when the thickness is reduced by 10% is the color difference when the thickness of the cross-section is reduced by 10%, and the color difference when the thickness is reduced by 20% is the color difference when the thickness of the cross-section is reduced by 20%, calculated from the following Equation 1 known in the art.

[0095] [Equation 1]

[0096] Color difference = [(Δa*) 2 +(Δb*) 2 ] 1 / 2

[0097] Referring to Table 1, it can be seen that the reflectance of the cover windows of Examples 1 to 3 is higher compared to the reflectance of the cover window of the Comparative Example. In addition, compared to the cover window of the Comparative Example, it can be seen that the cover windows of Examples 1 to 3 have a color difference of 0.8 to 1.5 when the thickness is reduced by 10% and a color difference of 1.3 to 2.3 when the thickness is reduced by 20%, indicating that there is no significant color difference.

[0098] That is, referring to FIG. 5a, the anti-reflection layer (RPL) has a first thickness (Th1) corresponding to the flat portion (FP) and a second thickness (Th2) corresponding to the bending portion (BP), wherein the second thickness (Th2) is smaller than the first thickness (Th1). Therefore, a color difference may occur between the portion corresponding to the flat portion (FP) and the portion corresponding to the bending portion (BP) of the anti-reflection layer (RPL). However, referring to embodiments 1 to 3 of the present invention, even if the thickness of the cover window is reduced by 10% and 20%, there is almost no color difference when compared to the comparative example, so the colors visible from the portion corresponding to the flat portion (FP) and the portion corresponding to the bending portion (BP) of the anti-reflection layer (RPL) can be the same. That is, the cover window (CW) of the present invention can exhibit improved display quality while maintaining excellent reflectivity.

[0099] FIGS. 6a to 6c are drawings showing graphs for explaining Example 2 described in Table 1. Specifically, FIG. 6a is a graph showing the reflection spectrum of the flat portion of Example 2 described in Table 1, FIG. 6b is a graph showing the reflection spectrum of the bending portion of Example 2 described in Table 1 according to angle, and FIG. 6c is a graph showing the tristimulus values ​​of Example 2 described in Table 1.

[0100] Referring to FIG. 6a, the reflectance according to the wavelength of Example 2 can be observed. For a wavelength of approximately 380 nm or more and 740 nm or less, the maximum reflectance is formed at a wavelength of 380 nm, and the value may be 20% or more and 25% or less. For a wavelength of 430 nm or more and 740 nm or less, the reflectance may be 0.1% or more and 2% or less.

[0101] According to one embodiment of the present invention, the minimum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a first point (a). The reflectance at the first point (a) can be 0.1% or more and 0.3% or less. The first point (a) can be formed at a wavelength of 440 nm or more and 460 nm or less.

[0102] According to one embodiment of the present invention, a second maximum reflectance at a wavelength of 380 nm or more and 740 nm or less may be formed at a second point (b). The reflectance at the second point (b) may be 0.9% or more and 1.5% or less. The second point (b) may be formed at a wavelength of 500 nm or more and 520 nm or less. As the wavelength increases between the first point (a) and the second point (b), the reflectance may increase.

[0103] According to one embodiment of the present invention, a second minimum reflectance at a wavelength of 380 nm or more and 740 nm or less may be formed at a third point (c). The reflectance at the third point (c) may be 0.5% or more and 1.0% or less. The third point (c) may be formed at a wavelength of 570 nm or more and 590 nm or less. Between the second point (b) and the third point (c), the reflectance may decrease as the wavelength increases.

[0104] According to one embodiment of the present invention, a third maximum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a fourth point (d). The reflectance at the fourth point (d) can be 0.8% or more and 1.3% or less. The fourth point (d) can be formed at a wavelength of 660 nm or more and 690 nm or less. Between the third point (c) and the fourth point (d), the reflectance can increase as the wavelength increases. In the region after the fourth point (d), the reflectance can decrease as the wavelength increases.

[0105] FIG. 6b shows graphs representing the reflection spectra of the bending portion (BP) illustrated in FIG. 5a according to angle. Specifically, the first graph (GL1) is a graph showing the reflectance according to wavelength when the bending portion (BP) is not bent (e.g., the bent angle is 0°), the second graph (GL2) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 10°, the third graph (GL3) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 20°, the fourth graph (GL4) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 30°, and the fifth graph (GL5) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 40°.

[0106] In FIG. 6c, graphs showing tristimulus values ​​according to the angle at which the bending part (BP, see FIG. 5a) is bent are illustrated. Specifically, the red graph (R) is the X value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent, the green graph (G) is the Y value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent, and the blue graph (B) is the Z value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent.

[0107] Referring to FIG. 6b, it can be seen that the points of the first to fourth graphs (GL1, GL2, GL3, GL4), corresponding to the first to fourth points (a, b, c, d) shown in FIG. 6a, move to the left as the angle of bending of the bending portion (BP, see FIG. 5a) increases. Accordingly, as shown in FIG. 6c, it can be seen that the tristimulus value according to the angle of bending of the bending portion (BP, see FIG. 5a) is formed consistently around 10.00. That is, since there is almost no color difference according to the angle, the color visible from the part corresponding to the flat portion (FP, see FIG. 5a) of the anti-reflective layer (RPL, see FIG. 5a) and the part corresponding to the bending portion (BP, see FIG. 5a) can be the same. In other words, the cover window (CW, see FIG. 5a) of the present invention can exhibit improved display quality while maintaining excellent reflectivity.

[0108] FIGS. 7a to 7c are drawings showing graphs for explaining Example 1 described in Table 1. Specifically, FIG. 7a is a graph showing the reflection spectrum of the flat portion of Example 1 described in Table 1, FIG. 7b is a graph showing the reflection spectrum of the bending portion of Example 1 described in Table 1 according to the angle, and FIG. 7c is a graph showing the tristimulus values ​​of Example 1 described in Table 1.

[0109] Referring to FIG. 7a, the reflectance according to the wavelength of Example 1 can be observed. For a wavelength of approximately 380 nm or more and 740 nm or less, the maximum reflectance is formed at a wavelength of 380 nm, and the value may be 20% or more and 25% or less. For a wavelength of 430 nm or more and 740 nm or less, the reflectance may be 0.1% or more and 2% or less.

[0110] According to one embodiment of the present invention, a minimum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a first point (a'). The reflectance at the first point (a') can be 0.1% or more and 0.8% or less. The first point (a') can be formed at a wavelength of 430 nm or more and 460 nm or less.

[0111] According to one embodiment of the present invention, a second maximum reflectance at a wavelength of 380 nm or more and 740 nm or less may be formed at a second point (b'). The reflectance at the second point (b') may be 0.8% or more and 1.0% or less. The second point (b') may be formed at a wavelength of 500 nm or more and 520 nm or less. As the wavelength increases between the first point (a') and the second point (b'), the reflectance may increase. In the region after the second point (b'), as the wavelength increases, the reflectance may decrease and then increase again. However, unlike what is illustrated, in the region after the second point (b'), the reflectance may remain constant even if the wavelength increases.

[0112] FIG. 7b shows graphs representing the reflection spectra of the bending portion (BP) illustrated in FIG. 5a according to angle. Specifically, the first graph (GL1a) is a graph showing the reflectance according to wavelength when the bending portion (BP) is not bent (e.g., the bending angle is 0°), the second graph (GL2a) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 10°, the third graph (GL3a) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 20°, the fourth graph (GL4a) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 30°, and the fifth graph (GL5a) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 40°.

[0113] In FIG. 7c, graphs showing tristimulus values ​​according to the angle at which the bending part (BP, see FIG. 5a) is bent are shown. Specifically, the red graph (R') is the X value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent, the green graph (G') is the Y value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent, and the blue graph (B') is the Z value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent.

[0114] Referring to FIGS. 7b and 7c together, it can be seen that the points corresponding to the first and second points (a', b') shown in FIG. 7a, respectively, in the first to fourth graphs (GL1a, GL2a, GL3a, GL4a), move to the left as the angle of bending of the bending section (BP, see FIG. 5a) increases. Accordingly, as shown in FIG. 7c, it can be seen that the tristimulus value according to the angle of bending of the bending section (BP, see FIG. 5a) is consistently formed around 10.00.

[0115] FIGS. 8a to 8c are drawings showing graphs for explaining Example 3 described in Table 1. Specifically, FIG. 8a is a graph showing the reflection spectrum of the flat portion of Example 3 described in Table 1, FIG. 8b is a graph showing the reflection spectrum of the bending portion of Example 3 described in Table 1 according to angle, and FIG. 8c is a graph showing the tristimulus values ​​of Example 3 described in Table 1.

[0116] Referring to FIG. 8a, the reflectance according to the wavelength of Example 3 can be observed. For a wavelength of approximately 380 nm or more and 740 nm or less, the maximum reflectance is formed at a wavelength of 380 nm, and the value may be 20% or more and 25% or less. For a wavelength of 430 nm or more and 740 nm or less, the reflectance may be 0.1% or more and 2% or less.

[0117] According to one embodiment of the present invention, the minimum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a first point (a''). The reflectance at the first point (a'') can be 0.3% or more and 0.6% or less. The first point (a'') can be formed at a wavelength of 440 nm or more and 460 nm or less.

[0118] According to one embodiment of the present invention, a second maximum reflectance at a wavelength of 380 nm or more and 740 nm or less may be formed at a second point (b''). The reflectance at the second point (b'') may be 0.6% or more and 0.9% or less. The second point (b'') may be formed at a wavelength of 480 nm or more and 500 nm or less. As the wavelength increases between the first point (a'') and the second point (b''), the reflectance may increase.

[0119] According to one embodiment of the present invention, a second minimum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a third point (c''). The reflectance at the third point (c'') can be 0.4% or more and 0.7% or less. The third point (c'') can be formed at a wavelength of 550 nm or more and 580 nm or less. As the wavelength increases between the second point (b'') and the third point (c''), the reflectance may decrease.

[0120] According to one embodiment of the present invention, a third maximum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a fourth point (d''). The reflectance at the fourth point (d'') can be 0.6% or more and 0.9% or less. The fourth point (d'') can be formed at a wavelength of 620 nm or more and 640 nm or less. As the wavelength increases between the third point (c'') and the fourth point (d''), the reflectance can increase.

[0121] According to one embodiment of the present invention, a third minimum reflectance at a wavelength of 380 nm or more and 740 nm or less can be formed at a fifth point (e''). The reflectance at the fifth point (e'') can be 0.4% or more and 0.7% or less. The fifth point (e'') can be formed at a wavelength of 700 nm or more and 740 nm or less. In the region after the fifth point (e''), the reflectance can increase as the wavelength increases.

[0122] FIG. 8b shows graphs representing the reflection spectra of the bending portion (BP) illustrated in FIG. 5a according to angle. Specifically, the first graph (GL1b) is a graph showing the reflectance according to wavelength when the bending portion (BP) is not bent (e.g., the bent angle is 0°), the second graph (GL2b) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 10°, the third graph (GL3b) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 20°, the fourth graph (GL4b) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 30°, and the fifth graph (GL5b) is a graph showing the reflectance according to wavelength when the bending angle of the bending portion (BP) is 40°.

[0123] In FIG. 8c, graphs showing tristimulus values ​​according to the angle at which the bending part (BP, see FIG. 5a) is bent are shown. Specifically, the red graph (R'') is the X value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent, the green graph (G'') is the Y value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent, and the blue graph (B'') is the Z value in the XYZ color system according to the angle at which the bending part (BP, see FIG. 5a) is bent.

[0124] Referring to FIGS. 8b and 8c together, it can be seen that the points of the first to fourth graphs (GL1b, GL2b, GL3b, GL4b), corresponding to the first to fourth points (a'', b'', c'', d'') shown in FIG. 8a, move to the left as the angle of bending of the bending section (BP, see FIG. 5a) increases. Accordingly, as shown in FIG. 8c, it can be seen that the tristimulus value according to the angle of bending of the bending section (BP, see FIG. 5a) is consistently formed around 10.00.

[0126] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art or those with ordinary knowledge in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and technical scope of the invention as described in the claims set forth below.

[0127] Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims. Explanation of the symbols

[0128] ED: Electronic device DD: Display device DM: Display Module CW: Cover Window FP: Flat section BP: Bending section BL: Base layer RPL: ​​Anti-reflective layer HR: High refractive index layer LR: Low refractive index layer

Claims

Claim 1 A display device comprising: a display panel including a light-emitting element; and a cover window disposed on the display panel and including a flat portion and a bending portion bent from the edge of the flat portion, wherein the cover window comprises: a base layer; and an anti-reflection layer disposed on the base layer and including a high refractive index layer and a low refractive index layer disposed on the high refractive index layer, wherein the reflectance of the anti-reflection layer decreases as the wavelength increases in the range of a wavelength of light being 380 nm or more and 450 nm or less and 500 nm or more and 580 nm or less. Claim 2 A display device according to claim 1, wherein the low-refractive layer comprises: a first low-refractive layer disposed on the high-refractive layer; and a second low-refractive layer disposed below the high-refractive layer. Claim 3 A display device according to claim 2, wherein the refractive index of the first low-refractive layer is 1.45 or higher and 1.5 or lower, the refractive index of the high-refractive layer is 1.8 or higher and 2.1 or lower, and the refractive index of the second low-refractive layer is 1.45 or higher and 1.7 or lower. Claim 4 In claim 2, the first low-refractive layer has a first thickness, the high-refractive layer has a second thickness, and the first thickness is greater than the second thickness. Claim 5 In claim 4, the second low-refractive layer has a third thickness, and the second thickness is greater than the third thickness. Claim 6 A display device according to claim 1, wherein the maximum reflectance of the anti-reflection layer is 20% or more and 30% or less in the range where the wavelength of the light is 380 nm or more and 740 nm or less. Claim 7 A display device according to claim 1, wherein the minimum reflectance of the anti-reflection layer exists in a range where the wavelength of the light is 440 nm or more and 460 nm or less. Claim 8 A display device according to claim 7, wherein the minimum reflectance is 0.1% or more and 0.3% or less. Claim 9 A display device according to claim 1, wherein the reflectance of the anti-reflection layer increases as the wavelength increases in the range where the wavelength of the light is 460 nm or longer and 500 nm or shorter. Claim 10 A display device according to claim 1, wherein the reflectance of the anti-reflection layer increases as the wavelength increases in the range where the wavelength of the light is 580 nm or longer and 680 nm or shorter. Claim 11 A display device according to claim 1, wherein the reflectance of the anti-reflection layer decreases as the wavelength increases in the range where the wavelength of the light is 680 nm or longer and 740 nm or shorter. Claim 12 A display device according to claim 1, wherein each of the high-refractive index layer and the low-refractive index layer is provided in a plurality, and the plurality of high-refractive index layers and the plurality of low-refractive index layers are arranged alternately. Claim 13 A display device according to claim 1, wherein the anti-reflection layer comprises: a first portion corresponding to the flat portion; and a second portion corresponding to the bending portion. Claim 14 In claim 13, a display device in which the thickness of the first part is greater than the thickness of the second part. Claim 15 A display device according to claim 1, wherein the cover window further comprises a functional layer disposed on the anti-reflective layer, and the functional layer comprises at least one of an antistatic agent, a hard coating agent, and an anti-fingerprint agent. Claim 16 A display device comprising: a display panel including a light-emitting element; and a cover window disposed on the display panel, wherein the cover window comprises: a base layer; and an anti-reflection layer disposed on the base layer and comprising a first refractive layer having different refractive indices, a second refractive layer disposed below the first refractive layer, and a third refractive layer disposed below the second refractive layer, wherein the second refractive layer has a greater refractive index than the first refractive layer and the third refractive layer, the first thickness of the first refractive layer is greater than the second thickness of the second refractive layer, and the second thickness of the second refractive layer is greater than the third thickness of the third refractive layer. Claim 17 A display device according to claim 16, wherein the refractive index of the first refractive layer is 1.45 or higher and 1.5 or lower, the refractive index of the second refractive layer is 1.8 or higher and 2.1 or lower, and the refractive index of the third refractive layer is 1.45 or higher and 1.7 or lower. Claim 18 A display device according to claim 16, wherein the reflectance of the anti-reflection layer decreases as the wavelength increases in the range where the wavelength of light is 380 nm or more and 450 nm or less and 500 nm or more and 580 nm or less. Claim 19 A display device according to claim 16, wherein the minimum reflectance of the anti-reflection layer exists in a range where the wavelength of light is 440 nm or more and 460 nm or less, and the minimum reflectance is 0.1% or more and 0.3% or less. Claim 20 An electronic device comprising a display device having a defined module area and an electronic module arranged to correspond to the module area, wherein the display device comprises: a display panel including a light-emitting element; and a cover window disposed on the display panel and comprising a flat portion and a bending portion bent from the edge of the flat portion, wherein the cover window comprises: a base layer; and an anti-reflection layer disposed on the base layer and comprising a high refractive index layer and a low refractive index layer disposed on the high refractive index layer, wherein for light having a wavelength of 380 nm or more and 450 nm or less and 500 nm or more and 580 nm or less, the reflectance of the anti-reflection layer decreases as the wavelength increases.

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