Window and display device including same

Abstract

The display device comprises a folding area and a non-folding area, wherein the folding area can be folded on a plane with a virtual folding shaft as the center, and the non-folding area is adjacent to the folding area. The display device further comprises a display panel. The window is arranged on the display panel. The window includes: patterned glass including a patterned portion corresponding to the folded region and having an upper trench pattern defined on an upper surface thereof, and a non-patterned portion adjacent to the patterned portion and corresponding to the non-folded region; and an upper filling layer filled in the upper trench pattern. The upper filling layer includes a first upper filling portion in contact with the pattern portion, and a second upper filling portion in contact with the first upper filling portion, the first upper filling portion having the same 1-1 refractive index with respect to the light of the first wavelength and the second upper filling portion having the same 2-1 refractive index with respect to the light of the first wavelength. The first upper filling portion has a first-second refractive index with respect to light of a second wavelength different from a second-second refractive index with respect to light of the second wavelength, and the second wavelength is different from the first wavelength.

Description

Technical Field

[0001] The present invention relates to a window and a display device comprising the same, and more particularly to a foldable window and a display device comprising the same. Background Art

[0002] The display device displays various images on a display screen and provides information to a user. Generally speaking, the display device displays information within an allocated screen.

[0003] Recently, a flexible display device including a foldable flexible display panel has been developed. Unlike a rigid display device, a flexible display device can be folded, rolled or bent. A flexible display device with a changeable shape can improve user convenience because it is not limited by the size of a traditional screen when carried. Summary of the invention

[0004] An object of the present invention is to provide a window having excellent visibility and folding properties.

[0005] An object of the present invention is to provide a display device including a window having excellent visibility and folding properties.

[0006] A display device according to an embodiment of the present invention includes a folding area that can be folded on a plane with a virtual folding axis as the center and a non-folding area adjacent to the folding area; the display device includes: a display panel, and a window, which is arranged on the display panel; the window includes: a patterned glass, including a patterned portion and a non-patterned portion, the patterned portion corresponds to the folding area and has an upper groove pattern defined on its upper surface, the non-patterned portion is adjacent to the patterned portion and corresponds to the non-folding area, and an upper filling layer filled in the upper groove pattern; the upper filling layer includes a first upper filling portion in contact with the patterned portion and a second upper filling portion in contact with the first upper filling portion, the first upper filling portion has a 1-1 refractive index for light of a first wavelength that is the same as the 2-1 refractive index of the second upper filling portion for light of the first wavelength, the first upper filling portion has a 1-2 refractive index for light of a second wavelength that is different from the 2-2 refractive index of the second upper filling portion for light of the second wavelength, and the second wavelength is different from the first wavelength.

[0007] A 3-1 refractive index of the pattern glass with respect to the light of the first wavelength may be the same as the 1-1 refractive index and the 2-1 refractive index.

[0008] A 3-2 refractive index of the pattern glass for the light of the second wavelength may be different from each of the 1-2 refractive index and the 2-2 refractive index, and the 1-2 refractive index may have a value between the 2-2 refractive index and the 3-2 refractive index.

[0009] The 1-2 refractive index may be lower than the 2-2 refractive index and higher than the 3-2 refractive index.

[0010] The first wavelength may be greater than or equal to 500 nm and less than or equal to 600 nm, and the second wavelength may be greater than or equal to 410 nm and less than 500 nm or greater than or equal to 600 nm and less than or equal to 700 nm.

[0011] The first wavelength may be greater than or equal to 570 nm and less than or equal to 600 nm.

[0012] A 1-3 refractive index of the first upper filling part with respect to light of a third wavelength different from each of the first wavelength and the second wavelength may be different from a 2-3 refractive index of the second upper filling part with respect to light of the third wavelength.

[0013] The first wavelength may be greater than or equal to 500 nm and less than or equal to 600 nm, the second wavelength may be greater than or equal to 410 nm and less than 500 nm, and the third wavelength may be greater than 600 nm and less than or equal to 700 nm.

[0014] The 1-3 refractive index may have a value between the 2-3 refractive index and the 3-3 refractive index, and the 3-3 refractive index is a refractive index of the pattern glass with respect to the light of the third wavelength.

[0015] The upper filling layer further includes a third upper filling portion contacting the second upper filling portion, and the first upper filling portion, the second upper filling portion, and the third upper filling portion may be sequentially stacked from an inner surface of the upper trench pattern.

[0016] The second upper filling part may include at least one of urethane resin, epoxy resin, polyester resin, polyethylene resin, acrylic resin, and ABS resin.

[0017] The upper groove pattern is provided in plurality, and the plurality of upper groove patterns may be arranged at intervals from each other.

[0018] The virtual folding axis extends in a first direction, the non-folding area includes a first non-folding area and a second non-folding area spaced apart from each other in a second direction, the folding area is provided between the first non-folding area and the second non-folding area, and the second direction is a direction perpendicular to the first direction, and a plurality of the upper groove patterns may be arranged along the second direction.

[0019] A lower groove pattern is defined on a lower surface of the pattern portion, and the window may further include a lower filling layer filled in the lower groove pattern.

[0020] The window may further include a window protection layer disposed on the patterned glass.

[0021] According to another display device of one embodiment of the present invention, the display device includes a folding area which can be folded on a plane with a virtual folding axis as the center and a non-folding area adjacent to the folding area; the display device includes: a display panel, and a window which is arranged on the display panel and satisfies the following mathematical formula 1; the window includes: a patterned glass including a patterned portion and a non-patterned portion, the patterned portion corresponds to the folding area and an upper groove pattern is defined on its upper surface, the non-patterned portion is adjacent to the patterned portion and corresponds to the non-folding area, and an upper filling layer which fills the upper groove pattern; the upper filling layer includes a first upper filling portion in contact with the patterned portion and a second upper filling portion in contact with the first upper filling portion.

[0022] [Mathematical formula 1]

[0023]

[0024] In the above-mentioned Mathematical Formula 1, n1, n2, and n3 are refractive indices of the first upper filling part, the second upper filling part, and the pattern glass with respect to the first visible light, respectively.

[0025] In the above-mentioned Mathematical Formula 1, n1, n2, and n3 may have different values, respectively.

[0026] In the above-mentioned Mathematical Formula 1, n1, n2, and n3 may each have a value of 1.4 or more and 1.6 or less.

[0027] In Math Formula 1, the first visible light may be red light or blue light.

[0028] A window according to an embodiment of the present invention comprises: patterned glass, comprising a pattern portion and a non-pattern portion, wherein the pattern portion defines an upper groove pattern on an upper surface and at least a portion of the pattern portion can be folded on a plane, the non-pattern portion is adjacent to the pattern portion, and an upper filling layer filling the upper groove pattern; the upper filling layer comprises an anti-reflection portion in contact with the pattern portion and a resin portion in contact with the anti-reflection portion, the 1-1 refractive index of the anti-reflection portion for light of a first wavelength is the same as the 2-1 refractive index of the resin portion for light of the first wavelength, the 1-2 refractive index of the anti-reflection portion for light of a second wavelength is different from the 2-2 refractive index of the resin portion for light of the second wavelength, and the first wavelength is different from the second wavelength.

[0029] (Effects of the Invention)

[0030] According to an embodiment of the present invention, the upper filling layer of the window includes a first upper filling portion having a refractive index for a long wavelength or short wavelength region between the refractive index of the second upper filling portion and the refractive index of the pattern portion, thereby reducing the reflectivity and preventing the pattern portion from being visible. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a perspective view of a display device according to an embodiment of the present invention.

[0032] FIG. 2A to FIG. 2D It is shown Figure 1 The diagram shows a state where the display device is folded.

[0033] Figure 3A It is a perspective view of a display device in an unfolded state according to an embodiment of the present invention.

[0034] Figure 3B and Figure 3C It is shown Figure 3A The diagram shows a state where the display device is multi-folded.

[0035] Figure 4 It is an exploded perspective view of an electronic device according to an embodiment of the present invention.

[0036] Figure 5A It is along Figure 4 A cross-sectional view of the display device cut along the cutting line II' shown.

[0037] Figure 5B yes Figure 5A An enlarged cross-sectional view of portion A1 is shown.

[0038] Fig. 6A This is a cross-sectional view showing a part of the cross section of the window according to one embodiment of the present invention.

[0039] Figure 6B FIG. 1 is a cross-sectional view showing a part of a cross section of a window according to another embodiment of the present invention.

[0040] Description of Reference Numerals

[0041] DD: display device; DP: display panel; DM: display module; UM: upper module; WM: window; PG: patterned glass; FL: upper filling layer; UFL: lower filling layer; PP: patterned part; NPP1, NPP2: non-patterned part; GP: upper groove pattern; UGP: lower groove pattern; Fa1: first upper filling part; Fa2: second upper filling part DETAILED DESCRIPTION

[0042] In this specification, when a certain structural element (or region, layer, part, etc.) is "above" another structural element, "connected" or "combined with" another structural element, it means that the certain structural element can be directly configured / connected / combined above the other structural element, or a third structural element can be configured between them.

[0043] The same reference numerals represent the same structural elements. In addition, in the drawings, the thickness, ratio and size of the structural elements are exaggerated for the effective description of the technical content. "And / or" includes more than one combination that can be defined by all the structural elements related to each other.

[0044] The terms first, second, etc. may be used to describe a variety of structural elements, but the structural elements are not limited to the terms. The terms are used only for the purpose of distinguishing one structural element from other structural elements. For example, without exceeding the scope of the claims of the present invention, the first structural element may be referred to as the second structural element, and by analogy, the second structural element may also be referred to as the first structural element. Unless the context clearly indicates a different meaning, a singular expression includes a plural expression.

[0045] In addition, the terms such as “below”, “lower side”, “above”, and “upper side” are used to describe the relationship between the components shown in the drawings. The terms are relative concepts and are described based on the directions shown in the drawings.

[0046] The terms “including” or “having” should be understood as intending to specify the existence of the features, numbers, steps, actions, structural elements, components or their combinations recorded in the specification, but are not intended to preclude the existence or additional possibilities of one or more other features, numbers, steps, actions, structural elements, components or their combinations.

[0047] Unless defined differently, all terms (including technical terms and scientific terms) used in this specification have the same meanings as those generally understood by those skilled in the art. In addition, terms that are the same as those defined in generally used dictionaries should be interpreted as having meanings consistent with the meanings they have in the context of the relevant technology, wherein, unless explicitly defined, they should not be interpreted as overly ideal or overly formal meanings.

[0048] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0049] Figure 1 It is a perspective view of a display device according to an embodiment of the present invention.

[0050] Reference Figure 1 The display device DD may be a device activated according to an electrical signal. The display device DD may include various embodiments. For example, the display device DD may be applicable to large electronic devices such as televisions, monitors, or external billboards, and may also be applicable to small and medium-sized electronic devices such as personal computers, notebook computers, personal digital terminals, car navigation units, game consoles, portable electronic devices, and cameras. In this embodiment, the case where the display device DD is a smartphone is illustrated as an example.

[0051] The display device DD has a rectangular shape having short sides in a first direction DR1 and long sides in a second direction DR2 crossing the first direction DR1. However, the shape of the display device DD is not limited thereto, but may be provided as a display device DD of various shapes.

[0052] The display device DD may be a foldable display device. Specifically, the display device DD of the embodiment of the present invention may be folded with a folding axis extending in a predetermined direction as a reference. Hereinafter, a state in which the display device DD is not folded but is flat is defined as a first state (i.e., an unfolded state), and a state in which the display device DD is folded with the folding axis as a reference is defined as a second state (i.e., a folded state). The folding axis is a rotation axis generated when the display device DD is folded, and may be formed by a mechanical structure of the display device DD.

[0053] The folding axis may extend in the first direction DR1 or the second direction DR2. In one embodiment of the present invention, the folding axis extending in the second direction DR2 is defined as the first folding axis FX1, and the folding axis extending in the first direction DR1 is defined as the second folding axis FX2. The display device DD may include one of the first and second folding axes FX1 and FX2. That is, the display device DD may be folded based on one of the first and second folding axes FX1 and FX2.

[0054] like Figure 1As shown, the display device DD can display the image IM on the display surface IS which is parallel to the first direction DR1 and the second direction DR2 respectively. The display surface IS which displays the image IM can correspond to the front surface (front surface) of the display device DD. The direction perpendicular to the display surface IS, that is, the thickness direction of the display device DD can be referred to as the third direction DR3. The display device DD can display the image IM toward the third direction DR3.

[0055] The display surface IS of the display device DD may be divided into a plurality of regions, and the display surface IS of the display device DD may be defined as a display area DA and a non-display area NDA.

[0056] The display area DA may be an area for displaying an image IM, and the user visually recognizes the image IM through the display area DA. The display area DA may be in a quadrilateral shape. The non-display area NDA, as an area adjacent to the display area DA, is an area where the image IM is not displayed. The non-display area NDA may be used to define a bezel area of ​​the display device DD. As an example of the present invention, the non-display area NDA may surround the display area DA. Therefore, the shape of the display area DA may be substantially defined by the non-display area NDA. However, this is only an exemplary illustration, and the non-display area NDA may be configured only adjacent to one side of the display area DA, or the non-display area NDA may be omitted.

[0057] The display device DD according to the present invention can sense the user's input TC applied from the outside. The user's input TC includes various forms of external inputs such as a part of the user's body, light, heat or pressure. In this embodiment, the user's input TC is shown as the user's hand applied to the front. However, this is only an exemplary illustration. As mentioned above, the user's input TC can be provided in various forms, and the display device DD can also sense the user's input TC applied to the side or back of the display device DD according to the structure of the display device DD, and is not limited to a certain embodiment.

[0058] The display device DD can sense the user's input TC while displaying the image IM by activating the display surface IS. In this embodiment, the area for sensing the user's input TC is shown as being set in the display area DA for displaying the image IM. However, this is only an exemplary illustration, and the area for sensing the user's input TC can also be provided in the non-display area NDA, or provided in all areas of the display surface IS.

[0059] FIG. 2A to FIG. 2D It is shown Figure 1 The diagram shows a state where the display device is folded.

[0060] Figure 2AIt is shown Figure 1 The display device DD shown in FIG. 1 is in a state of being folded inwardly (In-Folding) along the first folding axis FX1. Figure 2B It is shown Figure 1 The display device DD shown is in a state of being folded outwards (Out-Folding) along a first folding axis FX1.

[0061] Figure 2C It is shown Figure 1 The display device DD shown in the figure is folded inward along the second folding axis FX2, Figure 2D It is shown Figure 1 The display device DD shown is in a state where it is folded outward along the second folding axis FX2.

[0062] Reference FIG. 2A to FIG. 2D The display device DD may be a foldable display device. The display device DD may be folded with a folding axis extending in a predetermined direction, for example, with a first folding axis FX1 or a second folding axis FX2 as a reference.

[0063] Reference Figure 2A and Figure 2B , multiple areas can be defined on the display device DD according to the action form. The multiple areas can be divided into a folding area FA1 and at least one non-folding area NFA1, NFA2. The folding area FA1 is defined between the two non-folding areas NFA1, NFA2.

[0064] The folding area FA1 is a region folded along the first folding axis FX1 and is substantially a region with curvature. The first folding axis FX1 may extend in the second direction DR2, i.e., the long axis direction of the display device DD. The folding area FA1 is defined as a region folded along the first folding axis FX1 and extending in the second direction DR2.

[0065] As an example of the present invention, the non-folding areas NFA1 and NFA2 may include a first non-folding area NFA1 adjacent to one side of the folding area FA1 in the first direction DR1 and a second non-folding area NFA2 adjacent to the other side of the folding area FA1 in the first direction DR1.

[0066] The display device DD can be folded inward (In-Folding) or outward (Out-Folding). The situation in which the display surfaces of different non-folding areas NFA1, NFA2 can be folded relative to each other is defined as in-folding, and the situation in which the display surfaces of different non-folding areas NFA1, NFA2 are folded outward is defined as out-folding.

[0067] Here, inward folding refers to folding in which the display surfaces IS are opposite to each other, and outward folding refers to folding in which the back surfaces of the display devices DD are opposite to each other.

[0068] Figure 2A The display device DD shown can be folded inwardly so that the display surface IS (see Figure 1 ) and the display surface IS of the second unfolding area NFA2 (refer to Figure 1 ) can be opposite to each other. As the first non-folding area NFA1 rotates clockwise along the first folding axis FX1, the display device DD can be folded inward. In order to fold the display device DD inward in a manner that the first non-folding area NFA1 is aligned with the second non-folding area NFA2, the first folding axis FX1 can be defined as the center of the display device DD in the first direction DR1.

[0069] Reference Figure 2B The display device DD can be folded outwards based on the first folding axis FX1. The display device DD can display the image IM when the display surface of the first non-folding area NFA1 and the display surface of the second non-folding area NFA2 are exposed outwards. In addition, the display surface of the folding area FA1 exposed outwards can also display the image IM. Figure 1 As shown, the display device DD can display an image IM in the unfolded state. The first non-folding area NFA1, the second non-folding area NFA2 and the folding area FA1 can respectively display images providing independent information, or respectively display partial images of the same image providing the same information.

[0070] The display device DD may be manufactured in such a manner that it can have both an inwardly folded state and an outwardly folded state or one of the inwardly folded and outwardly folded states.

[0071] Reference Figure 2C and Figure 2D The display device DD can be folded inward or outward based on the second folding axis FX2. The second folding axis FX2 can extend in the first direction DR1, that is, the short axis direction of the display device DD.

[0072] A plurality of regions may be defined on the display device DD according to the action form. The plurality of regions may be divided into a folding region FA2 and at least one non-folding region NFA3, NFA4. The folding region FA2 may be defined between two non-folding regions NFA3, NFA4.

[0073] The folding area FA2 is a region folded along the second folding axis FX2 and is substantially a region having a curvature. The folding area FA2 is defined as a region folded along the second folding axis FX2 and extending in the first direction DR1.

[0074] As an example of the present invention, the non-folding areas NFA3 and NFA4 may include a first non-folding area NFA3 adjacent to one side of the folding area FA2 in the second direction DR2 and a second non-folding area NFA4 adjacent to the other side of the folding area FA2 in the second direction DR2.

[0075] Figure 3A It is a perspective view of a display device in an unfolded state according to an embodiment of the present invention. Figure 3B and Figure 3C It is shown Figure 3A The diagram shows a state where the display device is multi-folded.

[0076] Reference FIG. 3A to FIG. 3C , the display device DD1 may be a multi-foldable display device. Multiple folding areas may be defined on the display device DD1. The display device DD1 may include multiple folding areas FAa-1, FAa-2 and multiple non-folding areas NFAa-1, NFAa-2, NFAa-3. As an example of the present invention, the display device DD1 may include: a first folding area FAa-1, a second folding area FAa-2, a first non-folding area NFAa-1, a second non-folding area NFAa-2 and a third non-folding area NFAa-3. In the first direction DR1, the first folding area FAa-1 is arranged between the first non-folding area NFAa-1 and the second non-folding area NFAa-2, and the second folding area FAa-2 is arranged between the second non-folding area NFAa-2 and the third non-folding area NFAa-3. Although two folding areas FAa-1, FAa-2 and three non-folding areas NFAa-1, NFAa-2, NFAa-3 are illustrated as an example, the number of folding areas FAa-1, FAa-2 and non-folding areas NFAa-1, NFAa-2, NFAa-3 is not limited thereto and may be increased.

[0077] Reference Figure 3A and Figure 3B, the first folding area FAa-1 can be folded with the third folding axis FX3 parallel to the second direction DR2 as a reference. The first folding area FAa-1 can be inner-folded so that the display surface of the second non-folding area NFAa-2 and the display surface of the first non-folding area NFAa-1 are opposite to each other. The second folding area FAa-2 can be folded with the fourth folding axis FX4 parallel to the second direction DR2 as a reference. The second folding area FAa-2 can be outer-folded so that the back surface of the second non-folding area NFAa-2 and the back surface of the third non-folding area NFAa-3 are opposite to each other, and the display surface of the third non-folding area NFAa-3 faces outward.

[0078] Reference Figure 3A and Figure 3C , the first folding area FAa-1 can be folded with the third folding axis FX3 parallel to the second direction DR2 as a reference. And, the first folding area FAa-1 can be inner-folded so that the display surface of the first non-folding area NFAa-1 is arranged inside and the display surface of the second non-folding area NFAa-2 is opposite to the display surface of the first non-folding area NFAa-1. The second folding area FAa-2 can be folded with the fourth folding axis FX4 parallel to the second direction DR2 as a reference. And, the second folding area FAa-2 can be inner-folded so that the back of the first non-folding area NFAa-1 is opposite to the display surface of the third non-folding area NFAa-3.

[0079] In an embodiment of the present invention, the outer-folding action and the inner-folding action may occur simultaneously, or only one of the outer-folding action and the inner-folding action may occur.

[0080] In addition, although Figure 3B and Figure 3C , the display device DD1 is shown in a state of being multi-folded, but is not limited thereto, and may have various folding forms.

[0081] Figure 4 is an exploded perspective view of an electronic device according to an embodiment of the present invention, Figure 5A It is along Figure 4 A cross-sectional view of the display device cut along cutting line II' is shown. Figure 5B yes Figure 5A An enlarged cross-sectional view of portion A1 is shown.

[0082] Reference Figure 4 , Figure 5A as well as Figure 5B The electronic device ED of one embodiment of the present invention includes a display device DD and a housing HU. Although not shown in the figure, the electronic device ED may also include a mechanism structure (or hinge structure) for controlling the folding action (or bending action) of the display device DD.

[0083] The display device DD of an embodiment of the present invention may include: a display module DM for displaying images; an upper module UM disposed above the display module DM; and a lower module LM disposed below the display module DM. The display module DM may constitute a part of the display device DD, and in particular, the display module DM may generate images.

[0084] The display module DM may include a display panel DP and an input sensing unit ISP. The display panel DP of an embodiment of the present invention may be a light-emitting display panel, but there is no particular limitation. For example, the display panel DP may be an organic light-emitting display panel, an inorganic light-emitting display panel, or a quantum dot light-emitting display panel. The light-emitting layer of the organic light-emitting display panel may include an organic light-emitting substance, and the light-emitting layer of the inorganic light-emitting display panel may include an inorganic light-emitting substance. The light-emitting layer of the quantum dot light-emitting display panel may include quantum dots and quantum rods, etc. Hereinafter, the display panel DP will be described as an organic light-emitting display panel.

[0085] The display panel DP may be a flexible display panel, and thus the display panel DP may be rolled as a whole, or folded or unfolded around the folding axis FX2.

[0086] The input sensing unit ISP may be directly disposed on the display panel DP. According to an embodiment of the present invention, the input sensing unit ISP may be formed on the display panel DP through a continuous process. That is, in the case where the input sensing unit ISP is directly disposed on the display panel DP, an adhesive film is not disposed between the input sensing unit ISP and the display panel DP. However, the present invention is not limited thereto. An adhesive film may be disposed between the input sensing unit ISP and the display panel DP. In this case, the input sensing unit ISP is not manufactured together with the display panel DP through a continuous process, but may be manufactured through another process separate from the display panel DP and then fixed to the upper surface of the display panel DP using an adhesive film.

[0087] The display panel DP generates an image, and the input sensing unit ISP obtains coordinate information related to the user's input (eg, a touch event).

[0088] The upper module UM may include a window WM disposed on the display module DM. The window WM may include an optically transparent insulating material. Thus, the image generated in the display module DM can penetrate the window WM and be easily recognized by the user. The window WM may include a patterned glass PG, an upper filling layer FL, a lower filling layer UFL, and a window protection layer PL.

[0089] The pattern glass PG may include a glass material. The pattern glass PG may include a pattern portion PP and non-pattern portions NPP1 and NPP2. The pattern portion PP may be a portion corresponding to the folding area FA2, and the non-pattern portions NPP1 and NPP2 may be portions corresponding to the first and second non-folding areas NFA3 and NFA4. The non-pattern portions NPP1 and NPP2 may include a first non-pattern portion NPP1 corresponding to the first non-folding area NFA3 and a second non-pattern portion NPP2 corresponding to the second non-folding area NFA4. The pattern portion PP may be disposed between the first and second non-pattern portions NPP1 and NPP2.

[0090] The pattern glass PG may include an upper surface PG-F and a lower surface PG-B. The upper surface PG-F and the lower surface PG-B represent two surfaces of the pattern glass PG facing each other, for example, surfaces facing each other in the third direction DR3. In the pattern glass PG, the surface adjacent to the anti-reflection layer RPL or the display module DM in the third direction DR3 may be the lower surface PG-B, and the surface adjacent to the window protection layer PL is the upper surface PG-F.

[0091] The pattern part PP may include a plurality of upper groove patterns GP and a plurality of lower groove patterns UGP. In one embodiment, the upper groove pattern GP is provided on the upper surface PG-F of the pattern glass PG, and the lower groove pattern UGP is provided on the lower surface PG-B of the pattern glass PG. The upper groove pattern GP has a shape recessed from the upper surface PG-F of the pattern glass PG. The lower groove pattern UGP has a shape recessed from the lower surface PG-B of the pattern glass PG.

[0092] As an example of the present invention, when the folding axis FX2 extends in the first direction DR1, the upper groove patterns GP may be arranged at intervals in the second direction DR2, and the lower groove patterns UGP may be arranged at intervals in the second direction DR2. Alternatively, when the folding axis FX2 extends in the second direction DR2, the upper groove patterns GP may be arranged at intervals in the first direction DR1, and the lower groove patterns UGP may be arranged at intervals in the first direction DR1.

[0093] The upper groove pattern GP and the lower groove pattern UGP can be filled with the upper filling layer FL and the lower filling layer UFL, respectively. The upper filling layer FL can be filled in the upper groove pattern GP, ​​and the lower filling layer UFL can be filled in the lower groove pattern UGP. In other words, the recessed space formed by the upper groove pattern GP can be filled by the upper filling layer FL, and the recessed space formed by the lower groove pattern UGP can be filled by the lower filling layer UFL. Therefore, the window WM can have a flat surface using the upper filling layer FL and the lower filling layer UFL. As an example of the present invention, the upper filling layer FL and the lower filling layer UFL can be provided only in the pattern portion PP, and not in the first and second non-pattern portions NPP1 and NPP2.

[0094] The window WM may further include a window protection layer PL. The window protection layer PL may be provided on the pattern glass PG. The window protection layer PL may be provided on the upper filling layer FL. The window protection layer PL may perform the function of protecting the pattern glass PG from external impact. The window protection layer PL may include a synthetic resin material. As an example of the present invention, the window protection layer PL may include at least one selected from urethane resin, epoxy resin, polyester resin, polyethylene resin, acrylic resin, ABS resin (acrylonitrile-butadiene-styrene resin) and rubber. Specifically, the window protection layer PL may include at least one of phenylene, polyethylene terephthalate (PET), polyimide (PI), polyamide (PAI), polyethylene naphthalate (PEN) and polycarbonate (PC).

[0095] Although not shown in the figure, the window WM may also include a first window adhesive layer and a second window adhesive layer. The first window adhesive layer may be arranged between the pattern glass PG and the window protection layer PL, so as to adhere the window protection layer PL to the pattern glass PG. The second window adhesive layer may combine the component arranged below the window WM with the window WM. The first window adhesive layer and the second window adhesive layer may contain an optically transparent adhesive substance. As an example, the first window adhesive layer and the second window adhesive layer may respectively contain a pressure sensitive adhesive (PSA), an optically clear adhesive (OCA), or an optically clear resin (OCR).

[0096] The window WM can be folded or unfolded with the folding axis FX2 as the center. That is, when the shape of the display module DM is deformed, the shape of the window WM will also be deformed. The window WM allows the image from the display module DM to pass through while buffering the external impact, thereby preventing the display module DM from being damaged or malfunctioning due to the external impact. The impact from the outside refers to the external force that can be presented in the form of pressure, stress, etc., that is, the force that causes the display module DM to have defects.

[0097] Furthermore, the upper module UM may further include one or more functional layers disposed between the display module DM and the window WM. As an example of the present invention, the functional layer may be an anti-reflection layer RPL for blocking external light reflection.

[0098] The anti-reflection layer RPL can prevent the components constituting the display module DM from being visible to the outside due to the light incident from the front of the display device DD. The anti-reflection layer RPL may include a phase retarder and a polarizer. The phase retarder may be a film type or a liquid crystal coating type, and may include a λ / 2 phase retarder and / or a λ / 4 phase retarder. The polarizer may also be a film type or a liquid crystal coating type. The film type may include an extended synthetic resin film, and the liquid crystal coating type includes liquid crystals arranged in a prescribed arrangement order. The phase retarder and the polarizer may be implemented by a polarizing film. The functional layer may also include a protective film disposed on the upper or lower portion of the anti-reflection layer RPL.

[0099] The upper module UM may further include a first adhesive film AF1 provided between the anti-reflection layer RPL and the display module DM. The first adhesive film AF1 may include an optically transparent adhesive substance. As an example of the present invention, the first adhesive film AF1 may include a pressure sensitive adhesive (PSA), an optical clear adhesive (OCA), or an optical clear resin (OCR).

[0100] The display module DM may display an image according to an electrical signal and transmit and receive information related to an external input. The display module DM may include an active area AA and a peripheral area NAA. The active area AA may be defined as an area that emits an image provided by the display module DM.

[0101] The peripheral area NAA is adjacent to the active area AA. For example, the peripheral area NAA may surround the active area AA. However, this is only an exemplary illustration, and the peripheral area NAA may be defined in various shapes and is not limited to a certain embodiment. According to an embodiment, the active area AA of the display module DM may be adjacent to the display area DA (refer to Figure 1 ) corresponds to at least a portion of ).

[0102] The lower module LM includes a support plate SP disposed on the back of the display module DM and supporting the display module DM. The support plate SP may include a number of support plates corresponding to the non-folding areas NFA3 and NFA4. As an example of the present invention, the support plate SP may include a first support plate SP1 and a second support plate SP2 spaced apart from the first support plate SP1.

[0103] The first and second support plates SP1 and SP2 may be respectively configured to correspond to the first and second non-folding areas NFA3 and NFA4. The first support plate SP1 is configured to correspond to the first non-folding area NFA3 of the display module DM, and the second support plate SP2 is configured to correspond to the second non-folding area NFA4 of the display module DM. The first and second support plates SP1 and SP2 may respectively include metal materials or plastic materials.

[0104] When the display module DM is in the first flat state, the first and second support plates SP1 and SP2 are spaced apart from each other in the second direction DR2. When the display module DM is in the second state folded about the folding axis FX2, the first and second support plates SP1 and SP2 are spaced apart from each other in the third direction DR3.

[0105] The first and second support plates SP1 and SP2 may be spaced apart from each other corresponding to the folding area FA2. The first and second support plates SP1 and SP2 may partially overlap the folding area FA2. That is, in the second direction DR2, the spacing distance between the first and second support plates SP1 and SP2 may be smaller than the width of the folding area FA2.

[0106] The support plate SP may further include a connection module for connecting the first and second support plates SP1 and SP2. The connection module may include a hinge module or a multi-joint module.

[0107] Although the support plate SP is shown as having two support plates SP1 and SP2, it is not limited to this. That is, if there are multiple folding axes FX2, the support plate SP may have multiple support plates separated based on the multiple folding axes FX2. In addition, the support plate SP may be provided in an integral shape instead of being separated into the first and second support plates SP1 and SP2. In this case, a bent portion may be provided on the support plate SP corresponding to the folding area FA2. An opening (opening) formed by penetrating the support plate SP may be provided in the bent portion, or a groove recessed from one side of the support plate SP may be provided.

[0108] The lower module LM further includes a protective film PF disposed between the display module DM and the support plate SP. The protective film PF may be a layer disposed below the display module DM and protecting the back side of the display module DM. The protective film PF may include a synthetic resin film, such as a polyimide film or a polyethylene terephthalate film. However, this is only an example, and the protective film PF is not limited to the above example.

[0109] The lower module LM may further include a second adhesive film AF2 disposed between the protective film PF and the display module DM and third adhesive films AF3_1 and AF3_2 disposed between the protective film PF and the support plate SP. The protective film PF may be attached to the back of the display module DM using the second adhesive film AF2. As an example of the present invention, the third adhesive films AF3_1 and AF3_2 may include a first sub-adhesive film AF3_1 and a second sub-adhesive film AF3_2. The first sub-adhesive film AF3_1 is disposed between the first support plate SP1 and the protective film PF, and the second sub-adhesive film AF3_2 is disposed between the second support plate SP2 and the protective film PF. The first sub-adhesive film AF3_1 and the second sub-adhesive film AF3_2 may be separated from each other by the folding area FA2.

[0110] Each of the second and third adhesive films AF2, AF3_1, and AF3_2 may include an optically transparent adhesive substance. As an example of the present invention, each of the second and third adhesive films AF2, AF3_1, and AF3_2 may include a pressure sensitive adhesive (PSA), an optical clear adhesive (OCA), or an optical clear resin (OCR).

[0111] The housing HU is combined with the display device DD, especially with the window WM to accommodate the other modules (i.e., the display module DM and the lower module LM, etc.). Although the housing HU is shown as a structure including the first and second housings HU1 and HU2 separated from each other, it is not limited to this. Although not shown, the electronic device ED may also include a hinge structure for connecting the first and second housings HU1 and HU2.

[0112] The window WM according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0113] Fig. 6A and Figure 6B Each of them is a cross-sectional view showing a part of the cross section of the window according to one embodiment of the present invention. Fig. 6A and Figure 6B The cross sections of the folding areas FA2 of the windows WM and WM-1 are shown respectively. Fig. 6A and Figure 6B The components of the windows WM and WM-1 include the pattern glass PG, the upper filling layers FL and FL-1, and the lower filling layers UFL and UFL-1.

[0114] Reference Fig. 6A The pattern glass PG may include a pattern portion PP corresponding to the folding area FA2 (refer to Figure 5B ). The pattern part PP of the pattern glass PG (refer to Figure 5B ) may include a plurality of upper groove patterns GP and a plurality of lower groove patterns UGP. As an example of the present invention, the upper groove pattern GP may have a groove shape recessed from the upper surface PG-F of the pattern glass PG. The lower groove pattern UGP may have a groove shape recessed from the lower surface PG-B of the pattern glass PG.

[0115] Each of the upper groove pattern GP and the lower groove pattern UGP may have a direction parallel to the folding axis FX2 (see Figure 5A ) in a stripe shape extending in a direction parallel to the first direction DR1 (i.e., the first direction DR1). The upper groove patterns GP are arranged at intervals in the second direction DR2, and the lower groove patterns UGP are arranged at intervals in the second direction DR2. Alternatively, each upper groove pattern GP may include a plurality of first sub-upper groove patterns arranged at intervals in the first direction DR1. Each first sub-upper groove pattern may have a stripe shape extending in the first direction DR1.

[0116] The upper groove pattern GP and the lower groove pattern UGP may be filled with the upper filling layer FL and the lower filling layer UFL, respectively. The recessed space formed by the upper groove pattern GP may be filled with the upper filling layer FL, and the recessed space formed by the lower groove pattern UGP may be filled with the lower filling layer UFL.

[0117] Each of the upper filling layer FL and the lower filling layer UFL may include a first upper filling portion Fa1 and a first lower filling portion Fb1. The first upper filling portion Fa1 and the first lower filling portion Fb1 may be arranged along the inner surfaces of the upper groove pattern GP and the lower groove pattern UGP, respectively. The first upper filling portion Fa1 and the first lower filling portion Fb1 may be in contact with the recessed space formed by the upper groove pattern GP and the lower groove pattern UGP, respectively. In addition, in this specification, the first upper filling portion Fa1 may be referred to as an "anti-reflection portion".

[0118] Each of the upper filling layer FL and the lower filling layer UFL may include a second upper filling part Fa2 and a second lower filling part Fb2. The second upper filling part Fa2 and the second lower filling part Fb2 may be arranged along the inner surfaces of the first upper filling part Fa1 and the first lower filling part Fb1, respectively. The second upper filling part Fa2 and the second lower filling part Fb2 may be in contact with the first upper filling part Fa1 and the first lower filling part Fb1, respectively. That is, the first upper filling part Fa1 may be a structure arranged between the second upper filling part Fa2 and the pattern glass PG, and the first lower filling part Fb1 may be a structure arranged between the second lower filling part Fb2 and the pattern glass PG. Thus, the second upper filling part Fa2 and the second lower filling part Fb2 may be separated from the pattern glass PG by the first upper filling part Fa1 and the first lower filling part Fb1.

[0119] Each filling part in the second upper filling part Fa2 and the second lower filling part Fb2 may contain a synthetic resin material. As an example of the present invention, each filling part in the second upper filling part Fa2 and the second lower filling part Fb2 may contain at least one selected from urethane resin, epoxy resin, polyester resin, polyethylene resin, acrylic resin, ABS resin (acrylonitrile-butadiene-st yrene resin) and rubber. Specifically, each filling part in the second upper filling part Fa2 and the second lower filling part Fb2 may contain at least one of phenylene, polyethylene terephthalate (PET), polyimide (PI), polyamide (PAI), polyethylene naphthalate (PEN) and polycarbonate (PC). In addition, in this specification, the second upper filling part Fa2 may be referred to as a "resin part".

[0120] For light of the first wavelength, the first upper filling part Fa1 and the second upper filling part Fa2 have substantially the same refractive index value. In addition, in this specification, "substantially the same" not only includes the case where the refractive index, thickness, etc. of the structural elements are physically exactly the same, but also includes the case where there are specific differences, and the specific differences refer to the range of errors that will still occur in the process despite the same design. For light of the first wavelength, the first lower filling part Fb1 and the second lower filling part Fb2 can have substantially the same refractive index. For light of the first wavelength, the first and second upper filling parts Fa1, Fa2, the first and second lower filling parts Fb1, Fb2 can have the same refractive index as the pattern glass PG. That is, the first and second upper filling parts Fa1, Fa2, the first and second lower filling parts Fb1, Fb2 and the pattern glass PG can have the same refractive index for light of the first wavelength. In addition, in this specification, the refractive indexes of the first and second upper filling parts Fa1, Fa2 and the pattern glass PG for the light of the first wavelength may be referred to as the 1-1 refractive index, the 2-1 refractive index and the 3-1 refractive index, respectively. Since the first and second lower filling parts Fb1, Fb2 are respectively formed by the same process and the same material as the first and second upper filling parts Fa1, Fa2, the refractive indexes of the first and second lower filling parts Fb1, Fb2 for the light of the first wavelength may be respectively the same as the 1-1 refractive index and the 2-1 refractive index. That is, the 1-1 refractive index, the 2-1 refractive index and the 3-1 refractive index may be substantially the same.

[0121] The first wavelength may be greater than or equal to 500 nm and less than or equal to 600 nm. For example, the first wavelength may have a value greater than or equal to 570 nm and less than or equal to 600 nm, and the light of the first wavelength may be green light. The first and second upper filling parts Fa1, Fa2, the first and second lower filling parts Fb1, Fb2, and the pattern glass PG may all have the same refractive index for green light.

[0122] Since the 1-1 refractive index, the 2-1 refractive index, and the 3-1 refractive index are substantially the same, the reflectivity of the window WM to the light of the first wavelength can converge to 0. The reflectivity of the window WM can be expressed by the following mathematical formula K. Since the reflectivity of the window WM to the light of the first wavelength satisfies the following mathematical formula K, the display device including the window WM of one embodiment can achieve the effect of improving the visibility of the first wavelength region, i.e., green light.

[0123] Mathematical formula K

[0124]

[0125] In the mathematical formula K, n1, n2, and n3 are refractive indices of the first upper filling part Fa1, the second upper filling part Fa2, and the pattern glass PG, respectively.

[0126] For light of the second wavelength, the first upper filling part Fa1 and the second upper filling part Fa2 have different refractive index values. For light of the second wavelength, the first lower filling part Fb1 and the second lower filling part Fb2 may have different refractive indices. The refractive index of the pattern glass PG for light of the second wavelength may be different from the refractive index of each of the first and second upper filling parts Fa1, Fa2, and the first and second lower filling parts Fb1, Fb2 for light of the second wavelength. In addition, in the present specification, the refractive index of the first and second upper filling parts Fa1, Fa2 for light of the second wavelength and the refractive index of the pattern glass PG for light of the second wavelength may be referred to as the 1-2 refractive index, the 2-2 refractive index, and the 3-2 refractive index, respectively, and the refractive index of the first and second lower filling parts Fb1, Fb2 for light of the second wavelength may be the same as the 1-2 refractive index and the 2-2 refractive index, respectively. That is, the 1-2 refractive index may be different from the 2-2 refractive index, and the 3-2 refractive index may be different from both the 1-2 refractive index and the 2-2 refractive index.

[0127] The 1-2 refractive index may have a value between the 2-2 refractive index and the 3-2 refractive index. For example, the 1-2 refractive index may have a value lower than the 2-2 refractive index and a value higher than the 3-2 refractive index. As an example, the 1-2 refractive index may have a value similar to the square root of the value obtained by multiplying the 2-2 refractive index and the 3-2 refractive index. The relationship between the 1-2 refractive index, the 2-2 refractive index, and the 3-2 refractive index may be expressed by the following mathematical formula 1.

[0128] Mathematical formula 1

[0129]

[0130] In Mathematical Formula 1, n1, n2, and n3 are the refractive indices of the first upper filling part Fa1, the second upper filling part Fa2, and the pattern glass PG, respectively. That is, in Mathematical Formula 1, n1, n2, and n3 can represent the 1-2 refractive index, the 2-2 refractive index, and the 3-2 refractive index, respectively. Referring to the above Mathematical Formula 1, n1 is taken as the intermediate value. As a benchmark, it can have a value within the error range of 0.005. For example, n1 is the middle value As a benchmark, it can have a value within an error range of 0.003.

[0131] The second wavelength may be greater than 410 nm and less than 500 nm or greater than 600 nm and less than 700 nm. Compared with the first wavelength, the second wavelength may be a relatively long wavelength or a short wavelength. The light of the second wavelength may be red light or blue light. The first upper filling part Fa1 and the first lower filling part Fb1 may have different refractive indices for red light or blue light compared with the second upper filling part Fa2 and the second lower filling part Fb2, respectively. The refractive indices of the first and second upper filling parts Fa1, Fa2, the first and second lower filling parts Fb1, Fb2 for red light or blue light are different from the refractive index of the pattern glass PG for red light or blue light. In addition, in the present specification, the light of the second wavelength may be referred to as "first visible light".

[0132] When the 1-2 refractive index has a value between the 2-2 refractive index and the 3-2 refractive index, or the relationship between the 1-2 refractive index, the 2-2 refractive index, and the 3-2 refractive index satisfies the mathematical formula 1, the reflectivity of the window WM represented by the mathematical formula K may converge to 0. That is, the reflectivity of the window WM for the light of the second wavelength may converge to 0. Since the reflectivity of the window WM for the light of the second wavelength converges to 0, the display device including the window WM of one embodiment can achieve the effect of improving the visibility in the second wavelength region, that is, the red light or blue light region.

[0133] In another embodiment, the second wavelength may be greater than 410nm and less than 500nm, and the third wavelength may be greater than 600nm and less than 700nm. For the light of the second wavelength, the first upper filling part Fa1 and the second upper filling part Fa2 may have different refractive index values, and for the light of the third wavelength, the first upper filling part Fa1 and the second upper filling part Fa2 may have different refractive index values. The refractive index of the pattern glass PG for the light of the third wavelength may be different from the refractive index of each filling part in the first and second upper filling parts Fa1 and Fa2 for the light of the third wavelength. In addition, in this specification, the refractive index of the first and second upper filling parts Fa1 and Fa2 for the light of the third wavelength and the refractive index of the pattern glass PG for the light of the third wavelength may be referred to as the 1-3 refractive index, the 2-3 refractive index and the 3-3 refractive index, respectively, and the refractive index of the first and second lower filling parts Fb1 and Fb2 for the light of the third wavelength may be the same as the 1-3 refractive index and the 2-3 refractive index, respectively.

[0134] The 1-2 refractive index may have a value between the 2-2 refractive index and the 3-2 refractive index, and the 1-3 refractive index may have a value between the 2-3 refractive index and the 3-3 refractive index. Thus, the reflectivity of the window WM for the light of the second wavelength may converge to 0, and the reflectivity of the window WM for the light of the third wavelength may converge to 0. Thus, the display device including the window WM of one embodiment can achieve the effect of improving the visibility of the second and third wavelength regions, i.e., the red light and blue light regions.

[0135] Reference Figure 6B , the upper filling layer FL-1 may include the first and second upper filling parts Fa1, Fa2, and also include a third upper filling part Fa3. The lower filling layer UFL-1 may include the first and second lower filling parts Fb1, Fb2, and also include a third lower filling part Fb3. The third upper filling part Fa3 and the third lower filling part Fb3 may be arranged along the inner surfaces of the second upper filling part Fa2 and the second lower filling part Fb2, respectively. The third upper filling part Fa3 and the third lower filling part Fb3 may be in contact with the second upper filling part Fa2 and the second lower filling part Fb2, respectively. That is, the first upper filling part Fa1, the second upper filling part Fa2 and the third upper filling part Fa3 may be a structure stacked in sequence from the inner surface of the upper groove pattern GP.

[0136] The refractive index of each of the third upper filling part Fa3 and the third lower filling part Fb3 for the light of the first wavelength may be substantially the same as the refractive index of the first and second upper filling parts Fa1, Fa2, the first and second lower filling parts Fb1, Fb2 and the pattern glass PG for the light of the first wavelength. In addition, in this specification, the refractive index of the third upper filling part Fa3 for the light of the first wavelength may be referred to as the 4-1 refractive index. Since the third lower filling part Fb3 is formed by the same process and the same material as the third upper filling part Fa3, the refractive index of the third lower filling part Fb3 for the light of the first wavelength may be the same as the 4-1 refractive index.

[0137] Since the 1-1 refractive index, the 2-1 refractive index, the 3-1 refractive index, and the 4-1 refractive index are substantially the same, the reflectivity of the window WM-1 for the light of the first wavelength can converge to 0. The reflectivity of the window WM-1 can be represented by the following mathematical formula K-1. Since the reflectivity of the window WM-1 for the light of the first wavelength satisfies the following mathematical formula K-1, the display device including the window WM-1 of one embodiment can achieve the effect of improving the visibility of the first wavelength region, i.e., green light.

[0138] Mathematical formula K-1

[0139]

[0140] In the mathematical formula K-1, n1, n2, n3, and n4 are refractive indices of the first upper filling part Fa1, the second upper filling part Fa2, the pattern glass PG, and the third upper filling part Fa3, respectively.

[0141] The refractive index of each of the third upper filling part Fa3 and the third lower filling part Fb3 for the light of the second wavelength may be different from the refractive index of each of the first and second upper filling parts Fa1, Fa2, the first and second lower filling parts Fb1, Fb2 and the pattern glass PG for the light of the second wavelength. In addition, in this specification, the refractive index of the third upper filling part Fa3 for the light of the second wavelength may be referred to as the 4-2 refractive index. Since the third lower filling part Fb3 is formed by the same process and the same material as the third upper filling part Fa3, the refractive index of the third lower filling part Fb3 for the light of the second wavelength may be the same as the 4-2 refractive index.

[0142] The 1-2 refractive index may have a value between the 3-2 refractive index and the 4-2 refractive index. Thus, the reflectivity of the window WM-1 for the light of the second wavelength may converge to 0. Since the reflectivity of the window WM-1 for the light of the second wavelength converges to 0, the display device including the window WM-1 of one embodiment may achieve the effect of improving the visibility of the second wavelength region, i.e., the red light or blue light region.

[0143] Hereinafter, the characteristic evaluation results of the display device according to one embodiment of the present invention will be described with reference to examples and comparative examples. In addition, the examples disclosed below are only examples for helping to understand the present invention, and the scope of the present invention is not limited thereto.

[0144] Production and evaluation of display devices

[0145] The following embodiments and comparative examples are all made in the same manner except that the refractive indexes of the upper filling layer and the pattern glass are different. Figure 2C The display device of the structure. The windows of the embodiment, the comparative example 1 and the comparative example 2 each include Fig. 6AThe structure shown. The measurement conditions and evaluation results of the embodiment and the comparative example are shown in Table 1 below. The refractive indexes of the first upper filling part, the second upper filling part and the pattern glass in the embodiment, comparative example 1 and comparative example 2 are represented by the first refractive index, the second refractive index and the third refractive index. Each of the first refractive index, the second refractive index and the third refractive index is measured in the wavelength range shown in Table 1 below. In Table 1 below, the wavelength of 589nm can represent the aforementioned first wavelength, and the wavelengths of 414nm, 471nm and 651nm can represent the aforementioned second wavelength. Thus, the first refractive index, the second refractive index and the third refractive index for the first wavelength of 589nm can represent the aforementioned 1-1 refractive index, 2-1 refractive index and 3-1 refractive index, and the first refractive index, the second refractive index and the third refractive index for each of the second wavelengths of 414nm, 471nm and 651nm can represent the aforementioned 1-2 refractive index, 2-2 refractive index and 3-2 refractive index. In the evaluation of the display device in Table 1 below, the window reflectance was measured according to the above-mentioned mathematical formula K.

[0146] Table 1

[0147]

[0148] Referring to Table 1, for the first wavelength of 589nm, the 1-1 refractive index of the first upper filling part of Example 1, the 2-1 refractive index of the second upper filling part, and the 3-1 refractive index of the pattern glass are the same. For each of the second wavelengths of 414nm, 471nm, and 651nm, the 1-2 refractive index of the first upper filling part of Example 1 has a value between the 2-2 refractive index of the second upper filling part and the 3-2 refractive index of the pattern glass. For the first wavelength of 589nm, although the 1-1 refractive index, the 2-1 refractive index, and the 3-1 refractive index of Comparative Example 1 are the same, for each of the second wavelengths of 414nm, 471nm, and 651nm, the 1-2 refractive index of Comparative Example 1 does not have a value between the 2-2 refractive index and the 3-2 refractive index, and the 1-2 refractive index of Comparative Example 1 has the same value as the 2-2 refractive index. For the first wavelength of 589nm, although the 1-1 refractive index, the 2-1 refractive index and the 3-1 refractive index of Comparative Example 2 are the same, for each of the second wavelengths of 414nm, 471nm and 651nm, the 1-2 refractive index of Comparative Example 2 does not have a value between the 2-2 refractive index and the 3-2 refractive index, and the 1-2 refractive index of Comparative Example 2 has the same value as the 2-2 refractive index. Referring to the reflectivity results of the window in Table 1, it can be determined that the reflectivity of the window of Example 1 is reduced compared with Comparative Examples 1 and 2. In the display device of one embodiment of the present invention, since the 1-2 refractive index has a value between the 2-2 refractive index and the 3-2 refractive index, the reflectivity of the window to the second wavelength region, i.e., the red light or blue light region, is reduced, thereby improving visibility. The display device of one embodiment of the present invention includes a first upper filling portion having a 1-2 refractive index for light of the second wavelength and a second upper filling portion having a 2-2 refractive index for light of the second wavelength, thereby preventing the pattern portion in the window from being visible.

[0149] Although the above description is made with reference to the preferred embodiments of the present invention, it is understood by those skilled in the art or those of ordinary skill in the art that various modifications and changes may be made to the present invention without exceeding the scope of the concept and technical field of the present invention as described in the attached claims. Therefore, the technical scope of the present invention should not be limited to the contents described in the specific embodiments of the specification, but should be defined by the attached claims.

Claims

1. A display device, comprising a folding area on a plane that can be folded around a virtual folding axis and a non-folding area adjacent to the folding area, wherein: The display device comprises: Display panel, and A window, arranged on the display panel; The window includes: The patterned glass comprises a patterned portion and a non-patterned portion, wherein the patterned portion corresponds to the folding area and has an upper groove pattern defined on its upper surface, and the non-patterned portion is adjacent to the patterned portion and corresponds to the non-folding area, and An upper filling layer, filling the upper groove pattern; The upper filling layer includes a first upper filling portion contacting the pattern portion and a second upper filling portion contacting the first upper filling portion. The 1-1 refractive index of the first upper filling part with respect to the light of the first wavelength is the same as the 2-1 refractive index of the second upper filling part with respect to the light of the first wavelength. A 1-2 refractive index of the first upper filling part with respect to light of a second wavelength is different from a 2-2 refractive index of the second upper filling part with respect to light of the second wavelength, and the second wavelength is different from the first wavelength.

2. The display device according to claim 1, wherein: A 3-1 refractive index of the patterned glass with respect to the light of the first wavelength is the same as the 1-1 refractive index and the 2-1 refractive index.

3. The display device according to claim 1, wherein: The 3-2 refractive index of the patterned glass for the light of the second wavelength is different from each of the 1-2 refractive index and the 2-2 refractive index. The 1-2 refractive index has a value between the 2-2 refractive index and the 3-2 refractive index.

4. The display device according to claim 3, wherein: The 1-2 refractive index is lower than the 2-2 refractive index and higher than the 3-2 refractive index.

5. The display device according to claim 1, wherein: The first wavelength is greater than or equal to 500 nm and less than or equal to 600 nm. The second wavelength is greater than or equal to 410 nm and less than 500 nm, or greater than 600 nm and less than or equal to 700 nm.

6. The display device according to claim 5, wherein: The first wavelength is greater than or equal to 570 nm and less than or equal to 600 nm.

7. The display device according to claim 1, wherein: A 1-3 refractive index of the first upper filling part for light of a third wavelength is different from a 2-3 refractive index of the second upper filling part for light of the third wavelength, and the third wavelength is different from each of the first wavelength and the second wavelength.

8. The display device according to claim 7, wherein: The first wavelength is greater than or equal to 500 nm and less than or equal to 600 nm, the second wavelength is greater than or equal to 410 nm and less than 500 nm, and the third wavelength is greater than 600 nm and less than or equal to 700 nm.

9. The display device according to claim 7, wherein: The 1-3 refractive index has a value between the 2-3 refractive index and the 3-3 refractive index, and the 3-3 refractive index is a refractive index of the pattern glass with respect to the light of the third wavelength.

10. The display device according to claim 1, wherein: The upper filling layer further includes a third upper filling portion contacting the second upper filling portion, The first upper filling portion, the second upper filling portion, and the third upper filling portion are sequentially stacked from an inner surface of the upper trench pattern.

11. The display device according to claim 1, wherein: The second upper filling part includes at least one of urethane resin, epoxy resin, polyester resin, polyethylene resin, acrylic resin and ABS resin.

12. The display device according to claim 1, wherein: The upper groove pattern is provided with a plurality of, A plurality of the upper groove patterns are arranged at intervals from each other.

13. The display device according to claim 12, wherein: The virtual folding axis extends in a first direction, The non-folding region includes a first non-folding region and a second non-folding region spaced apart from each other in a second direction, the folding region is provided between the first non-folding region and the second non-folding region, and the second direction is a direction perpendicular to the first direction, A plurality of the upper groove patterns are arranged along the second direction.

14. The display device according to claim 1, wherein: A lower groove pattern is defined on the lower surface of the pattern portion, The window further includes a lower filling layer filled in the lower trench pattern.

15. The display device according to claim 1, wherein: The window also includes a window protection layer configured on the patterned glass.

16. A display device comprising a folding area on a plane that can be folded around a virtual folding axis and a non-folding area adjacent to the folding area, wherein: The display device comprises: Display panel, and A window is arranged on the display panel and satisfies the following mathematical formula 1; The window includes: The patterned glass comprises a patterned portion and a non-patterned portion, wherein the patterned portion corresponds to the folding area and has an upper groove pattern defined on its upper surface, and the non-patterned portion is adjacent to the patterned portion and corresponds to the non-folding area, and An upper filling layer, filling the upper groove pattern; The upper filling layer includes a first upper filling portion contacting the pattern portion and a second upper filling portion contacting the first upper filling portion; [Mathematical formula 1] In the above-mentioned Mathematical Formula 1, n1, n2, and n3 are refractive indices of the first upper filling part, the second upper filling part, and the pattern glass with respect to the first visible light, respectively.

17. The display device according to claim 16, wherein: In the above mathematical formula 1, n1, n2, and n3 have different values, respectively.

18. The display device according to claim 16, wherein: In the above mathematical formula 1, n1, n2, and n3 each have a value of 1.4 or more and 1.6 or less.

19. The display device according to claim 16, wherein: In the above mathematical formula 1, The first visible light is red light or blue light.

20. A window, wherein: include: A patterned glass comprising a patterned portion and a non-patterned portion, wherein an upper groove pattern is defined on an upper surface of the patterned portion and at least a portion of the patterned portion can be folded on a plane, and the non-patterned portion is adjacent to the patterned portion, and An upper filling layer, filling the upper groove pattern; The upper filling layer includes an anti-reflection portion in contact with the pattern portion and a resin portion in contact with the anti-reflection portion. The 1-1 refractive index of the antireflection portion with respect to light of the first wavelength is the same as the 2-1 refractive index of the resin portion with respect to light of the first wavelength, The 1-2 refractive index of the antireflection portion with respect to light of the second wavelength is different from the 2-2 refractive index of the resin portion with respect to light of the second wavelength, The first wavelength is different from the second wavelength.

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