Display device

Abstract

A display device includes a flexible display panel, and a roller disposed on a side of the flexible display panel to wind the flexible display panel, wherein the flexible display panel includes a first base including a first base substrate having a display area and a non-display area adjacent to each other, and a light emitting element layer including a light emitting element disposed on the display area, a second base including a second base substrate opposite to the first base substrate, and a color conversion layer disposed on the second base substrate and corresponding to each light emitting element, and an adhesive filling layer disposed in the display area to form a cell gap between the first base and the second base, and disposed in the non-display area to be in contact with the first base substrate and the second base substrate to couple and seal the first base substrate and the second base substrate.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2019-0082783, filed on July 9, 2019, which is incorporated herein by reference for all purposes, as fully set forth herein. Technical Field

[0003] Exemplary embodiments of this disclosure generally relate to display devices, and more specifically, to rollable display devices. Background Technology

[0004] Various display devices, including flexible display panels, are being developed to meet current market demands. For example, recent display devices include curved display devices with a fixed curvature, foldable display devices capable of bending with a small radius of curvature or folding along a folding axis, and rollable display devices capable of rolling up with a specific radius of curvature. Specifically, rollable display devices are being extensively studied due to their superior portability in terms of display area.

[0005] However, the flexible display panel of a rollable display device has a structure in which various components are stacked. Therefore, when the rollable display device is rolled up, some components may break due to the stress applied to the rollable display device.

[0006] The information disclosed in this background section is only for understanding the background of the inventive concept, and therefore may contain information that does not constitute prior art. Summary of the Invention

[0007] A rollable display device constructed according to exemplary embodiments of the present disclosure is able to reduce stress during its roll-up operation in order to provide high reliability.

[0008] Additional features of the inventive concept will be set forth in the description below, and these additional features will be partly apparent from the description, or may be learned by practice of the inventive concept.

[0009] A display device includes: a flexible display panel; and a roller disposed on a side of the flexible display panel and configured to wind the flexible display panel, wherein the flexible display panel includes: a first substrate, the first substrate including: a first base substrate having adjacent display areas and non-display areas; and a light-emitting element layer including a plurality of light-emitting elements disposed on the display areas of the first base substrate; a second substrate including: a second base substrate opposite to the first base substrate; and a color conversion layer disposed on the second base substrate and corresponding to each of the plurality of light-emitting elements; and an adhesive filling layer disposed in the display areas to form a unit gap between the first substrate and the second substrate, and disposed in the non-display areas to contact the first base substrate and the second base substrate to couple and seal the first base substrate and the second base substrate.

[0010] The first substrate and the second substrate comprise glass material.

[0011] The adhesive filler layer comprises a transparent epoxy resin.

[0012] Each of the first and second substrates has a thickness ranging from about 0.01 mm to about 0.2 mm.

[0013] The thickness of the first substrate and the thickness of the second substrate are equal to or different from each other.

[0014] The display device also includes a fastening frame that is fastened to the opposite side of the flexible display panel.

[0015] The display device further includes a flexible circuit board, which is fastened to the opposite side of the flexible display panel and housed in the fastening frame.

[0016] The display device further includes a reinforcing film disposed adjacent to the flexible circuit board and located on the rear surface of the first substrate.

[0017] The display device further includes an adhesive layer that secures the side portion of the flexible display panel to the roller.

[0018] The display device further includes: an auxiliary sheet disposed between the side portion of the flexible display panel and the roller; a first adhesive layer securing the auxiliary sheet to the side portion of the flexible display panel; and a second adhesive layer securing the auxiliary sheet to the roller.

[0019] A display device according to another exemplary embodiment includes: a flexible display panel; and a roller disposed on a side of the flexible display panel and configured to wind the flexible display panel, wherein the flexible display panel includes: a first substrate, the first substrate including: a first base substrate having display areas and non-display areas adjacent to each other; and a light-emitting element layer including a plurality of light-emitting elements disposed on the display areas of the first base substrate, the first base substrate including a glass material; a second substrate, the second substrate including: a second base substrate opposite to the first base substrate and including a glass material; and a color conversion layer disposed on the second base substrate to correspond to each of the plurality of light-emitting elements; and an adhesive filling layer disposed in the display areas to form a cell gap between the first substrate and the second base substrate, and the adhesive filling layer disposed in the non-display areas to contact the first base substrate and the second base substrate to couple and seal the first base substrate and the second base substrate, and each of the light-emitting elements having a length ranging from a few nanometers to several hundred micrometers.

[0020] A display device according to yet another exemplary embodiment includes: a flexible display panel including display areas and non-display areas adjacent to each other; a roller disposed on a side of the flexible display panel and configured to wind around the flexible display panel; and a housing housing the roller, wherein the housing includes a transmissive window disposed at the front of the housing and exposing a first area of ​​the flexible display panel, and the first area is configured to display a first image through the transmissive window.

[0021] It will be understood that the foregoing general description and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the present disclosure and illustrate exemplary embodiments of the present disclosure, and together with the description serve to illustrate the inventive concept.

[0023] Figure 1This is a perspective view of a display device according to an exemplary embodiment.

[0024] Figure 2A This is a cross-sectional view of a display device in an active state.

[0025] Figure 2B This is a cross-sectional view of a display device in standby mode.

[0026] Figure 3 This is a cross-sectional view of a flexible display panel according to an exemplary embodiment.

[0027] Figure 4A , Figure 4B and Figure 4C This is an enlarged cross-sectional view of a flexible display panel according to an exemplary embodiment.

[0028] Figure 5 This is an enlarged cross-sectional view of a flexible display panel according to an exemplary embodiment.

[0029] Figure 6 It is shown as an example Figure 5 The diagram shows the arrangement of the light-emitting element, the first electrode, and the second electrode.

[0030] Figure 7A , Figure 7B , Figure 7C and Figure 7D This illustrates the manufacturing process according to an exemplary embodiment. Figure 3 A plan view of the process of making a flexible display panel.

[0031] Figure 8A , Figure 8B , Figure 8C , Figure 8D , Figure 8E and Figure 8F This illustrates the manufacturing process according to an exemplary embodiment. Figure 3 A cross-sectional view of the process of making a flexible display panel.

[0032] Figure 9A yes Figure 2A A magnified view of part "A1".

[0033] Figure 9B This is an enlarged view of part "A1" according to another exemplary embodiment.

[0034] Figure 10 This is a cross-sectional view of a display device according to an exemplary embodiment.

[0035] Figure 11 This is a cross-sectional view of a display device according to an exemplary embodiment.

[0036] Figure 12This is a perspective view of a display device according to an exemplary embodiment.

[0037] Figure 13 It is shown as an example Figure 12 A front view of the display device in standby mode.

[0038] Figure 14A and Figure 14B This is a cross-sectional view showing the standby state of a display device according to an exemplary embodiment.

[0039] Figure 15A This is a cross-sectional view showing the standby state of a display device according to another exemplary embodiment, and Figure 15B It is shown as an example Figure 15A A front view of the display device in standby mode.

[0040] Figure 16A and Figure 16B This is a cross-sectional view showing the active state of a display device according to an exemplary embodiment.

[0041] Figure 17A and Figure 17B This is a cross-sectional view showing the active state of a double-sided display device according to an exemplary embodiment.

[0042] Figure 18 This is a plan view illustrating a structure in which a flexible display panel and an inner roller are coupled to each other according to an exemplary embodiment.

[0043] Figure 19 yes Figure 18 The cross-sectional view of the flexible display panel shown.

[0044] Figure 20 This is a cross-sectional view showing a structure in which the two rollers and the flexible display panel are coupled to each other according to an exemplary embodiment. Detailed Implementation

[0045] In the following description, numerous specific details are set forth for illustrative purposes in order to provide a thorough understanding of various exemplary embodiments or implementations of this disclosure. As used herein, the terms "embodiment" and "implementation" are interchangeable and are non-limiting examples of apparatus or methods employing one or more inventive concepts disclosed herein. However, it will be apparent, however, that various exemplary embodiments may be implemented without these specific details or using one or more equivalent arrangements. In other instances, well-known structures and apparatuses are shown in block diagram form to avoid unnecessarily obscuring the various exemplary embodiments. Furthermore, the various exemplary embodiments may be different, but not necessarily exclusive. For example, the specific shape, configuration, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0046] Unless otherwise stated, the exemplary embodiments shown are to be understood as providing exemplary features of variable details in which some of the inventive concepts can be implemented in practice. Therefore, unless otherwise stated, features, components, modules, layers, films, panels, regions and / or aspects, etc. (hereinafter individually or collectively referred to as “elements”) of various embodiments may be combined, separated, interchanged and / or rearranged in other ways without departing from the inventive concept.

[0047] The use of crosshairs and / or shading in accompanying drawings is typically intended to clarify the boundaries between adjacent elements. Therefore, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for particular materials, material properties, dimensions, scale, commonalities between illustrated elements, and / or any other characteristics, properties, or properties of the elements. Furthermore, in the drawings, the dimensions and relative dimensions of elements may be exaggerated for clarity and / or descriptive purposes. A particular process sequence may be performed differently than the order described when exemplary embodiments can be implemented differently. For example, two consecutively described processes may be performed substantially simultaneously, or they may be performed in the reverse order of description. Moreover, the same reference numerals indicate the same elements.

[0048] When an element, such as a layer, is referred to as being "on," "connected to," or "coupled to" another element or layer, the element may be directly on, directly connected to, or directly coupled to the other element or layer, or there may be intermediate elements or layers present. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly coupled to" another element or layer, there are no intermediate elements or layers present. Therefore, the term "connection" can refer to a physical connection, electrical connection, and / or fluid connection, with or without intermediate elements. Furthermore, the D1, D2, and D3 axes are not limited to the three axes of a Cartesian coordinate system such as the x, y, and z axes, and can be interpreted in a broader sense. For example, the D1, D2, and D3 axes can be perpendicular to each other, or they can represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" can be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] Although the terms “first,” “second,” etc., may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, the first element discussed below may be referred to as the second element.

[0050] For descriptive purposes, spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side” (e.g., as in “sidewall”) may be used herein to describe the relationship of one element to another (or multiple elements) as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to cover different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, an element described as “below” or “under” other elements or features would subsequently be oriented “above” other elements or features. Thus, the exemplary term “below” can cover both above and below orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees, or placed in other orientations), and thus the spatial relative descriptive terms used herein may be interpreted accordingly.

[0051] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are also intended to include the plural forms. Furthermore, when used in this specification, the terms “comprising,” “including,” “containing,” and / or “having” indicate the presence of the stated features, integrals, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and similar terms are used as approximate terms rather than terms of degree, and therefore, to account for inherent biases in the description of measured, calculated, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0052] In this document, various exemplary embodiments are described with reference to cross-sectional views and / or exploded views, which are schematic diagrams of idealized exemplary embodiments and / or intermediate structures. Therefore, variations in the shapes of the illustrated areas are anticipated, for example, due to manufacturing techniques and / or tolerances. Consequently, the exemplary embodiments disclosed herein should not be necessarily construed as limited to the shapes of the specifically shown areas, but will include, for example, deviations in shape caused by manufacturing processes. In this way, the areas shown in the figures may be schematic in nature, and the shapes of these areas may not reflect the actual shapes of the areas of the device, and therefore are not necessarily intended to be limiting.

[0053] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formalized sense.

[0054] Figure 1 This is a perspective view of a display device according to an exemplary embodiment. Figure 2A This is a cross-sectional view of the display device in its active state. Figure 2B This is a cross-sectional view of a display device in standby state, and Figure 3 This is a cross-sectional view of a flexible display panel according to an exemplary embodiment.

[0055] Reference Figure 1 The display device 100 according to an exemplary embodiment may include: a flexible display panel DP; a housing 30 in which rollers 31 are housed; and a fastening frame 40 coupled to a portion of the flexible display panel DP.

[0056] The flexible display panel DP can have paper-like bendability and can have a portion fixed to a roller 31, which can be wound around the roller 31. According to an exemplary embodiment, the flexible display panel DP can have a generally rectangular shape having a pair of sides parallel to a first direction DR1 and a pair of sides parallel to a second direction DR2 intersecting the first direction DR1. However, the inventive concept is not limited to a specific shape of the flexible display panel DP, and the shape of the flexible display panel DP can be varied.

[0057] The portion located by the first side of the aforementioned edges will be referred to as the first side of the flexible display panel DP, and the portion located by the second side of the aforementioned edges will be referred to as the second side of the flexible display panel DP. Specifically, the first side and the second side can be a pair of sides parallel to the second direction DR2. The first side of the flexible display panel DP can be fastened to the roller 31, and the second side of the flexible display panel DP can be fastened to the fastening frame 40.

[0058] like Figure 1 As shown, the flexible display panel DP can display images on a display surface parallel to a first direction DR1 and a second direction DR2. In the following text, the direction orthogonal to this display surface will be referred to as the third direction DR3.

[0059] A flexible display panel DP may include a display area DA for displaying images and a non-display area NDA surrounding the display area DA. Specifically, the display area DA may be the area for displaying images, and in this case, the image can be provided to the user through the display area DA. The display area DA may be generally rectangular. The non-display area NDA may surround the display area DA. Therefore, the shape of the display area DA may be generally defined by the non-display area NDA.

[0060] The non-display area NDA can be a region adjacent to the display area DA, and may not display an image. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the non-display area NDA can be set as a portion near the edge of the display area DA.

[0061] Reference Figure 1 and Figure 3 For example, a flexible display panel DP can be an organic light-emitting display panel. A flexible display panel DP may include a first substrate FS, a second substrate SS, and an adhesive filler layer AFL. The first substrate FS and the second substrate SS can be coupled to each other via the adhesive filler layer AFL.

[0062] The first substrate FS may include: a first substrate BS1, in which adjacent display areas DA and non-display areas NDA are defined; and a light-emitting element layer DP-EDL, which includes a plurality of light-emitting elements disposed in the display areas DA of the first substrate BS1. The second substrate SS may include: a second substrate BS2, which is configured to face the first substrate BS1; and a color conversion layer CCL, which is disposed on the second substrate BS2 to correspond to each light-emitting element.

[0063] An adhesive filler layer AFL can be disposed in the display area DA, forming a cell gap between the first substrate FS and the second substrate SS, and disposed in the non-display area NDA to contact the first substrate BS1 and the second substrate BS2. In this way, the first substrate BS1 and the second substrate BS2 can be coupled to and sealed to each other.

[0064] According to an exemplary embodiment, the flexible display panel DP may further include an input sensing unit capable of sensing user input provided from the outside. User input may include various types of external input, such as a part of the user's body, light, heat, or pressure.

[0065] Reference Figures 1 to 2B Roller 31 can be placed within housing 30. Roller 31 can be configured to rotate clockwise or counterclockwise. Figure 2B As shown, in standby mode, the flexible display panel DP can be wound around roller 31 and housed within housing 30. Figure 1 and Figure 2A As shown, in the active state, the flexible display panel DP can be unfolded from the roller 31 and stretched. Therefore, the user HE can recognize the image displayed on the stretched flexible display panel DP.

[0066] The rotation direction of roller 31 during the winding of the flexible display panel DP can be opposite to the rotation direction of roller 31 during the unfolding of the flexible display panel DP. Specifically, if roller 31 rotates clockwise during the winding of the flexible display panel DP, then roller 31 can rotate counterclockwise when unfolding the flexible display panel DP from roller 31.

[0067] According to an embodiment, the display device 100 may further include additional mechanical components for automatically unfolding the flexible display panel DP wound around the roller 31, and for supporting and maintaining the flexible display panel DP in the unfolded state. For example, the mechanical components may be disposed between the housing 30 and the fastening frame 40, and may be configured to lift the fastening frame 40 in an upward direction, and when the fastening frame 40 is placed in the maximum lifted position, the mechanical components are configured to consistently maintain the distance between the housing 30 and the fastening frame 40.

[0068] The fastening frame 40 may include a receiving space in which a second side of the flexible display panel DP may be received. In some exemplary embodiments, a fastening member may also be provided in the receiving space to fasten the flexible display panel DP to the fastening frame 40.

[0069] The display device 100 may further include a driving circuit unit coupled to a second side of the flexible display panel DP. The driving circuit unit may include a flexible circuit board FCB disposed on a first substrate FS of the flexible display panel DP and a main circuit board MCB coupled to the flexible circuit board FCB. The flexible circuit board FCB may be attached to a portion of the non-display area NDA of the first substrate FS (e.g., a pad area with pads), and the main circuit board MCB may be disposed on the rear surface of the first substrate FS.

[0070] In some exemplary embodiments, the drive circuit unit may further include a drive chip mounted on the flexible circuit board FCB. The flexible circuit board FCB may be connected to the main circuit board MCB. Both the main circuit board MCB and the flexible circuit board FCB may be formed of a flexible film.

[0071] Figure 2A and Figure 2B The illustrated drive circuit unit includes two circuit boards, FCB and MCB; however, the inventive concept is not limited thereto. For example, in some exemplary embodiments, the drive circuit unit may include only the flexible circuit board FCB.

[0072] Figures 4A to 4C This is an enlarged cross-sectional view of a flexible display panel according to an exemplary embodiment.

[0073] Reference Figure 4AIn the display area DA of the flexible display panel DP, a first pixel area PXA1, a second pixel area PXA2, a third pixel area PXA3, and a non-pixel area NPXA can be defined. Each first pixel area PXA1 can be configured to provide a second color light, each second pixel area PXA2 can be configured to provide a third color light, and each third pixel area PXA3 can be configured to provide a first color light. The first, second, and third color lights can be lights of different colors. For example, one of the first to third color lights can be blue light, another can be red light, and yet another can be green light.

[0074] A non-pixel region NPXA can be a region adjacent to the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3. The non-pixel region NPXA can define the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3. A non-pixel region NPXA can be provided to prevent color mixing between the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3.

[0075] The first substrate FS of the flexible display panel DP may include a first substrate BS1, a display circuit layer DP-CL, and a light-emitting element layer DP-EDL. According to an exemplary embodiment, the first substrate BS1, the display circuit layer DP-CL, and the light-emitting element layer DP-EDL may be stacked sequentially along the third direction DR3.

[0076] The first substrate BS1 may be a component providing a substrate surface on which the display circuit layer DP-CL is disposed. The first substrate BS1 may be a glass substrate, a metal substrate, or a plastic substrate, etc. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the first substrate BS1 may be an inorganic layer, an organic layer, or a layer made of composite materials.

[0077] The display circuit layer DP-CL can be disposed on the first substrate BS1. The display circuit layer DP-CL may include multiple transistors. Each transistor may include a control electrode, an input electrode, and an output electrode. For example, the display circuit layer DP-CL may include a switch and a drive transistor for driving an organic electroluminescent device.

[0078] The light-emitting element layer (DP-EDL) can be disposed on the display circuit layer (DP-CL). The DP-EDL may include a plurality of organic light-emitting devices and an encapsulation layer covering the organic light-emitting devices. According to an exemplary embodiment, the DP-EDL may include a light-emitting layer (EML) that emits a first color of light (see, for example, [link to example]). Figure 4BThe first color light can be blue light. The emissive layer (EML) can be a common layer that is shared across multiple organic light-emitting devices. For example, each organic light-emitting device can emit the first color light through the emissive layer (EML).

[0079] The second substrate SS of the flexible display panel DP may include a second substrate BS2, a color conversion layer CCL, a light blocking layer BML, and a protective layer PL.

[0080] The second substrate BS2 can be positioned opposite the first substrate BS1. The second substrate BS2 can be a glass substrate, a metal substrate, or a plastic substrate, etc. For example, the first substrate BS1 and the second substrate BS2 can include the same material. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the second substrate BS2 can include an inorganic layer, an organic layer, or a layer made of a composite material.

[0081] The color conversion layer (CCL) may include an optical converter. The optical converter may be a quantum dot, a phosphor, or a phosphor, etc. The optical converter can change the wavelength of light incident upon it and can emit light with the changed wavelength. Specifically, the color conversion layer (CCL) may be a layer comprising at least one or more of quantum dots, phosphors, and phosphors.

[0082] The color conversion layer (CCL) may include multiple color conversion layers CCL1, CCL2, and CCL3. These multiple color conversion layers CCL1, CCL2, and CCL3 may be spaced apart from each other along a first direction DR1 and a second direction DR2 (see [link to documentation]). Figure 1 ).

[0083] The light-blocking layer BML can be disposed between the spaced-apart color conversion layers CCL1, CCL2, and CCL3, but the inventive concept is not limited thereto. In some exemplary embodiments, the light-blocking layer BML can overlap with the edge regions of the color conversion layers CCL1, CCL2, and CCL3. The light-blocking layer BML can be a black matrix. The light-blocking layer BML can include organic or inorganic light-blocking materials containing black pigments or dyes. The light-blocking layer BML can prevent light leakage and can define the adjacent color conversion layers CCL1, CCL2, and CCL3.

[0084] Color conversion layers CCL1, CCL2, and CCL3 may include: a first color conversion layer CCL1, which converts a first color light provided from the DP-EDL light-emitting element layer into a second color light; a second color conversion layer CCL2, which converts the first color light into a third color light; and a third color conversion layer CCL3, which transmits the first color light. The first color conversion layer CCL1 may correspond to a first pixel region PXA1, the second color conversion layer CCL2 may correspond to a second pixel region PXA2, and the third color conversion layer CCL3 may correspond to a third pixel region PXA3.

[0085] According to an exemplary embodiment, the first color conversion layer CCL1 can provide red light as a second color light, and the second color conversion layer CCL2 can provide green light as a third color light. The third color conversion layer CCL3 can transmit and provide blue light as a first color light provided from the DP-EDL light-emitting element layer.

[0086] The first color conversion layer CCL1 may include a matrix portion MX and a first quantum dot QD1 dispersed in the matrix portion MX. The first color conversion layer CCL1 may also include a light scattering agent SP dispersed in the matrix portion MX. The second color conversion layer CCL2 may include a matrix portion MX and a second quantum dot QD2 dispersed in the matrix portion MX, and may also include a light scattering agent SP. For example, the first quantum dot QD1 may be a red quantum dot, and the second quantum dot QD2 may be a green quantum dot. Additionally, the third color conversion layer CCL3 may include a matrix portion MX and a light scattering agent SP.

[0087] The matrix portion MX may be a medium in which quantum dots QD1 and QD2 or light scattering agent SP are dispersed, and may be formed from various resin compositions commonly referred to as binders. According to an exemplary embodiment, the matrix portion MX may include a polymer resin composition. For example, the polymer resin composition for the matrix portion MX may include acrylic resins, polyurethane resins, silicone resins, or epoxy resins, etc. The polymer resin composition according to an exemplary embodiment may be transparent.

[0088] Quantum dots QD1 and QD2 can be particles that convert the wavelength of light supplied from the emissive layer EML. Quantum dots QD1 and QD2 can be nanoscale crystalline materials composed of hundreds to thousands of atoms, and due to their small size, they can exhibit a quantum confinement effect to increase the band gap. When the energy of light incident on quantum dots QD1 and QD2 is greater than the band gap of each quantum dot in QD1 and QD2, each quantum dot can absorb the light and become excited, and then emit light of a specific wavelength while transitioning to its ground state. The wavelength of the emitted light can be determined by the band gap. Specifically, by adjusting the size or composition of quantum dots QD1 and QD2, the quantum confinement effect and subsequent luminescence properties can be controlled. The color of the light emitted from quantum dots QD1 or QD2 can be changed according to their particle size. For example, as the particle size of quantum dots QD1 or QD2 decreases, the wavelength of the light emitted from them can become shorter. For example, the second quantum dot QD2, which emits green light, can have a smaller particle size than the first quantum dot QD1, which emits red light.

[0089] The nuclei of quantum dots QD1 and QD2 can be selected from the following groups of substances: group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds and combinations thereof.

[0090] Group II-VI compounds may be selected from the group consisting of: binary compounds (e.g., including CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, and MgS) and mixtures thereof; ternary compounds (e.g., including AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnSeS, CuInS, CdSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnSeS, CdSeTe, Cd ... The compounds nS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe and MgZnS) and mixtures thereof, quaternary compounds (e.g., including HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and HgZnSTe) and mixtures thereof.

[0091] Group I-III-VI compounds may be selected from the following substances: ternary element compounds selected from the group consisting of AgInS2, CuInS2, AgGaS2, CuGaS2 and combinations thereof, and quaternary element compounds selected from the group consisting of AgInGaS2 and CuInGaS2.

[0092] Group III-V compounds may be selected from the group consisting of: binary compounds (e.g., including GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, and InSb) and mixtures thereof; ternary compounds (e.g., including GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, and InPSb) and mixtures thereof; quaternary compounds (e.g., including GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb) and mixtures thereof. Group III-V compounds may also include Group II compounds. For example, III-II-V group compounds can be selected from InZnP.

[0093] Group IV-VI compounds may be selected from the group consisting of: binary compounds (e.g., including SnS, SnSe, SnTe, PbS, PbSe, and PbTe) and mixtures thereof; ternary compounds (e.g., including SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, and SnPbTe) and mixtures thereof; and quaternary compounds (e.g., including SnPbSSe, SnPbSeTe, and SnPbSTe) and mixtures thereof. Group IV elements may be selected from the group consisting of Si, Ge, and mixtures thereof. Group IV compounds may include binary compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0094] Binary, ternary, or quaternary compounds can have a uniform concentration throughout the particle, or they can have a spatially varying concentration distribution within each particle.

[0095] Quantum dot QD1 or QD2 can have a core-shell structure comprising a core and a shell surrounding the core. However, in some exemplary embodiments, quantum dot QD1 or QD2 can have a core-shell structure in which the quantum dot is surrounded by another quantum dot. At the interface between the core and the shell, the elements contained in the shell can have a concentration gradient that decreases along the central direction.

[0096] Quantum dots QD1 or QD2 can be nanoscale particles. According to an exemplary embodiment, each quantum dot in QD1 and QD2 can have an emission wavelength spectrum, wherein the full width at half maximum (FWHM) is less than about 45 nm, less than about 40 nm, or less than about 30 nm. In this case, color purity or color reproduction characteristics can be improved. Furthermore, quantum dots QD1 and QD2 can emit light radially, thus improving viewing angle characteristics.

[0097] According to exemplary embodiments, quantum dots QD1 and QD2 can be generally spherical, pyramidal, multi-armed, or cubic nanoparticles. In some exemplary embodiments, quantum dots can be nanotubes, nanowires, nanofibers, or nanosheet-shaped particles, but are not limited thereto.

[0098] According to an exemplary embodiment, the light scattering agent SP can be inorganic particles. For example, the light scattering agent SP may include at least one of TiO2, ZnO, Al2O3, SiO2, and hollow silica, and mixtures thereof.

[0099] The color conversion layer (CCL) may be covered with a protective layer (PL). The protective layer (PL) prevents external moisture and / or oxygen (hereinafter referred to as "moisture / oxygen") from passing through it. The protective layer (PL) prevents or at least inhibits the color conversion layer (CCL) from being exposed to moisture / oxygen.

[0100] The protective layer PL according to an exemplary embodiment may include at least one inorganic layer. For example, the protective layer PL may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal thin film with high light transmittance. Furthermore, the protective layer PL may also include an organic layer. The protective layer PL may be formed as a single layer or multiple layers.

[0101] In the display area DA, the adhesive filler layer AFL can be located between the protective layer PL and the light-emitting element layer DP-EDL to form a cell gap. In the non-display area NDA, the adhesive filler layer AFL can be in contact with the first substrate BS1 and the second substrate BS2. Through the adhesive properties of the adhesive filler layer AFL, the first substrate BS1 and the second substrate BS2 can be coupled to each other. Furthermore, the space between the first substrate BS1 and the second substrate BS2 can be sealed tightly by the adhesive filler layer AFL. For example, the adhesive filler layer AFL may comprise epoxy resin.

[0102] According to an exemplary embodiment, such as Figure 4B As shown, the light-emitting element layer DP-EDL may include a pixel-defining layer PDL, multiple organic electroluminescent devices EDL1, EDL2 and EDL3, and an encapsulation layer TFE.

[0103] The pixel definition layer (PDL) can be a layer that defines multiple pixel regions PXA1 to PXA3 in the light-emitting element layer (DP-EDL). Specifically, the pixel definition layer (PDL) has openings corresponding to the multiple pixel regions PXA1 to PXA3, and the area where the pixel definition layer (PDL) is disposed can be defined as a non-pixel region NPXA.

[0104] The pixel defining layer (PDL) can be formed from a polymer resin. For example, the pixel defining layer (PDL) may include at least one of a polyacrylate resin and a polyimide resin. In an exemplary embodiment, in addition to a polymer resin, the pixel defining layer (PDL) may also include an inorganic material. Alternatively, the pixel defining layer (PDL) may include a light-absorbing material, a black pigment, or a black dye. When the pixel defining layer (PDL) includes a black pigment or black dye, a black pixel defining layer can be formed. Carbon black and the like can be used as black pigments or black dyes for the pixel defining layer (PDL), but the inventive concept is not limited thereto.

[0105] Multiple organic light-emitting diodes (OLEDs) EDL1, EDL2, and EDL3 can be configured to correspond to pixel regions, respectively. Each OLED can include a first electrode EL1-1, EL1-2, and EL1-3. The first electrodes EL1-1, EL1-2, and EL1-3 can be configured to correspond to a pixel region and can be spaced apart from the first electrodes of other pixel regions adjacent to that pixel region. The first electrodes EL1-1, EL1-2, and EL1-3 disposed in pixel regions PXA1 to PXA3 can form a first electrode layer EL1, which is formed on the display circuit layer DP-CL. Each of the first electrodes EL1-1, EL1-2, and EL1-3 can be exposed through an opening in the pixel defining layer PDL.

[0106] The first electrodes EL1-1, EL1-2, and EL1-3 may be formed of a metal alloy or a conductive compound. According to an exemplary embodiment, the first electrodes EL1-1, EL1-2, and EL1-3 may be anodes. In some exemplary embodiments, the first electrodes EL1-1, EL1-2, and EL1-3 may be pixel electrodes.

[0107] In each organic electroluminescent device (EDL) according to exemplary embodiments, the first electrodes EL1-1, EL1-2, and EL1-3 may be reflective electrodes. However, the inventive concept is not limited thereto. For example, in some exemplary embodiments, the first electrodes EL1-1, EL1-2, and EL1-3 may be transparent electrodes or semi-transmissive / semi-reflective electrodes. When the first electrodes EL1-1, EL1-2, and EL1-3 are semi-transmissive / semi-reflective electrodes or reflective electrodes, the first electrodes EL1-1, EL1-2, and EL1-3 may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, compounds thereof, and mixtures thereof (e.g., a mixture of Ag and Mg). Alternatively, the first electrodes EL1-1, EL1-2, and EL1-3 may have a multilayer structure comprising a reflective layer or a semi-transparent / semi-reflective layer and a transparent conductive layer, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO). For example, the first electrodes EL1-1, EL1-2, and EL1-3 may be multi-metal layers and may have a structure in which ITO / Ag / ITO metal layers are stacked.

[0108] Each of the organic electroluminescent devices EDL1, EDL2 and EDL3 may also include a light-emitting layer EML and a second electrode EL2.

[0109] The light-emitting layer (EML) can have a single-layer structure made of a single material, a single-layer structure made of multiple different materials, or a multi-layer structure including multiple layers made of multiple different materials.

[0110] The emissive layer (EML) can emit a first color of light. According to exemplary embodiments, the EML may include a fluorescent or phosphorescent material. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the EML may include materials known in the art. Furthermore, the EML may include a host and dopants. Figure 4B and Figure 4C As shown, the light-emitting layer EML can be set as a common layer formed throughout the first pixel region PXA1 to the third pixel region PXA3.

[0111] The hole transport region can be disposed between the light-emitting layer EML and the first electrodes EL1-1, EL1-2, and EL1-3. The hole transport region may include a hole transport layer and a hole injection layer.

[0112] The second electrode EL2 can be disposed on the light-emitting layer EML. The second electrode EL2 can be a common electrode or a cathode. The second electrode EL2 can be formed of a metal alloy or a conductive compound. The second electrode EL2 can be a transparent electrode, a semi-transmissive / semi-reflective electrode, or a reflective electrode. When the second electrode EL2 is a transparent electrode, it can be formed of a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO).

[0113] When the second electrode EL2 is a semi-transmissive / semi-reflective electrode or a reflective electrode, the second electrode EL2 may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, their compounds, and mixtures thereof (e.g., a mixture of Ag and Mg). Alternatively, the second electrode EL2 may be a multilayer structure comprising a reflective layer or a semi-transmissive / semi-reflective layer and a transparent conductive layer, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO).

[0114] like Figure 4B As shown, the second electrode EL2 can be configured as a common layer formed throughout the first pixel region PXA1 to the third pixel region PXA3.

[0115] An electron transport region may be disposed between the second electrode EL2 and the light-emitting layer EML. The electron transport region may include at least one of a hole blocking layer, an electron transport layer, and an electron injection layer, but the inventive concept is not limited thereto. When the electron transport region includes an electron injection layer and an electron transport layer, at least one known electron injection material and at least one known electron transport material may be used in the electron injection layer and the electron transport layer, respectively.

[0116] The encapsulation layer TFE can be disposed on the organic electroluminescent devices EDL1 to EDL3. The encapsulation layer TFE can cover the organic electroluminescent devices EDL1 to EDL3. Specifically, the organic electroluminescent devices EDL1 to EDL3 can be hermetically sealed by the encapsulation layer TFE.

[0117] In some exemplary embodiments, the encapsulation layer TFE may include a first inorganic layer IL1, an organic layer IL1, and a second inorganic layer IL2 stacked sequentially. The organic layer IL1 may be disposed between the first inorganic layer IL1 and the second inorganic layer IL2. The first inorganic layer IL1 and the second inorganic layer IL2 may be formed by depositing inorganic materials, and the organic layer IL1 may be formed by depositing, printing, or coating organic materials.

[0118] The first inorganic layer IL1 and the second inorganic layer IL2 can protect multiple organic electroluminescent devices EDL1 to EDL3 from moisture and oxygen, and the organic layer OL can protect multiple organic electroluminescent devices EDL1 to EDL3 from contaminating materials such as dust particles. The first inorganic layer IL1 and the second inorganic layer IL2 can include at least one of silicon nitride, silicon oxynitride, silicon oxide, titanium dioxide, and aluminum oxide. The organic layer OL can include at least one polymer, such as an acrylic organic layer. However, the inventive concept is not limited thereto.

[0119] Figure 4B An illustrative example shows an encapsulation layer TFE comprising two inorganic layers and one organic layer, but the inventive concept is not limited thereto. For example, the encapsulation layer TFE may comprise three inorganic layers and two organic layers, and in this case, the inorganic and organic layers may be stacked alternately in the encapsulation layer TFE.

[0120] In the flexible display panel DP according to an exemplary embodiment, the second substrate SS2 may include a second substrate BS2, color filter layers CF1, CF2, CF3, light blocking layer BML, first protective layer PL1, color conversion layer CCL, and second protective layer PL2.

[0121] Color filter layers CF1 to CF3 may include a first color filter layer CF1 corresponding to a first color conversion layer CCL1, a second color filter layer CF2 corresponding to a second color conversion layer CCL2, and a third color filter layer CF3 corresponding to a third color conversion layer CCL3. The first color filter layer CF1 may be a red color filter layer, the second color filter layer CF2 may be a green color filter layer, and the third color filter layer CF3 may be a blue color filter layer.

[0122] Each of the first color filter layer CF1, the second color filter layer CF2, and the third color filter layer CF3 may include a polymeric photosensitive resin and a pigment or dye. The first color filter layer CF1 may include a red pigment or dye, the second color filter layer CF2 may include a green pigment or dye, and the third color filter layer CF3 may include a blue pigment or dye.

[0123] However, the inventive concept is not limited thereto, and in some exemplary embodiments, the third color filter layer CF3 may not include pigments or dyes. For example, the third color filter layer CF3 may include a polymeric photosensitive resin, but may not include pigments or dyes. The third color filter layer CF3 may be transparent. For example, the third color filter layer CF3 may be formed of a transparent photosensitive resin.

[0124] The light-blocking layer BML can be disposed between the first color filter layers CF1 to the third color filter layers CF3, which are spaced apart from each other, but the inventive concept is not limited thereto. In some exemplary embodiments, the light-blocking layer BML can overlap with the edge regions of the first color filter layers CF1 to the third color filter layers CF3. The light-blocking layer BML can be a black matrix. The light-blocking layer BML can include organic or inorganic light-blocking materials containing black pigments or dyes. The light-blocking layer BML can prevent light leakage and can define the first color filter layers CF1 to the third color filter layers CF3 that are adjacent to each other.

[0125] The second substrate BS2 can be disposed on the light-blocking layer BML and the first color filter layers CF1 to the third color filter layers CF3. The second substrate BS2 can be a component providing a substrate surface on which the light-blocking layer BML, the first color filter layers CF1 to the third color filter layers CF3, the first color conversion layers CCL1 to the third color conversion layers CCL3, and the first protective layer PL1 and the second protective layer PL2 can be disposed. The second substrate BS2 can be a glass substrate, a metal substrate, or a plastic substrate, etc. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the second substrate BS2 can be an inorganic layer, an organic layer, or a layer made of composite materials.

[0126] The first protective layer PL1 can be disposed on the color filter layers CF1 to CF3 and the light-blocking layer BML. Color conversion layers CCL1 to CCL3 can be disposed on the first protective layer PL1. The color conversion layers CCL1 to CCL3 can have the same characteristics as... Figure 4A The color conversion layers CCL1 to CCL3 shown have the same structure. A second protective layer PL2 can be disposed on the color conversion layers CCL1 to CCL3.

[0127] The first protective layer PL1 prevents external moisture / oxygen from passing through. The first protective layer PL1 prevents or at least inhibits the color conversion layer CCL from being exposed to moisture / oxygen.

[0128] The first protective layer PL1 and the second protective layer PL2 may each include at least one inorganic layer. Specifically, the first protective layer PL1 and the second protective layer PL2 may include inorganic materials. For example, the first protective layer PL1 and the second protective layer PL2 may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal thin film with high light transmittance. Furthermore, at least one of the first protective layer PL1 and the second protective layer PL2 may also include an organic layer. Each of the first protective layer PL1 and the second protective layer PL2 may be formed as a single layer or multiple layers. In some exemplary embodiments, at least one of the first protective layer PL1 and the second protective layer PL2 may be omitted.

[0129] Reference Figure 4C According to an exemplary embodiment, the display circuit layer DP-CL may include a first transistor TR1, a second transistor TR2, and a third transistor TR3, as well as multiple insulating layers FIL, SIL, and TIL. The insulating layers FIL, SIL, and TIL may include a first insulating layer FIL, a second insulating layer SIL, and a third insulating layer TIL.

[0130] A first transistor TR1, a second transistor TR2, and a third transistor TR3 can be disposed on a first substrate BS1. The first transistor TR1, the second transistor TR2, and the third transistor TR3 can have substantially the same structure. Therefore, the first transistor TR1 will be described exemplarily. The first transistor TR1 may include a control electrode CE, an input electrode IE, an output electrode OE, and a semiconductor layer ACL.

[0131] The semiconductor layer ACL can be disposed on the first substrate BS1. In some exemplary embodiments, a buffer layer can also be disposed between the first substrate BS1 and the semiconductor layer ACL. The buffer layer may include a light-blocking material for blocking external light from passing through the first substrate BS1 and entering the semiconductor layer ACL.

[0132] The semiconductor layer ACL may include polycrystalline silicon or amorphous silicon. In some exemplary embodiments, the semiconductor layer ACL may include a metal-oxide-semiconductor. The semiconductor layer ACL may include: a channel region that can serve as a conductive path for electrons or holes; and a first doped region and a second doped region spaced apart from each other, with the channel region located between the first doped region and the second doped region.

[0133] A first insulating layer (FIL) may be disposed on a first substrate (BS1) to cover the semiconductor layer (ACL). The first insulating layer (FIL) may include an inorganic material. The inorganic material may include at least one of silicon nitride, silicon oxynitride, silicon oxide, titanium oxide, and aluminum oxide.

[0134] A control electrode CE can be disposed on a first insulating layer FIL. A second insulating layer SIL can be disposed on the first insulating layer FIL to cover the control electrode CE. The second insulating layer SIL can be formed as a single layer or multiple layers. For example, a single layer may include an inorganic layer. Multiple layers may include organic layers and inorganic layers.

[0135] The input electrode IE and the output electrode OE can be disposed on the second insulating layer SIL. The input electrode IE and the output electrode OE can be connected to the semiconductor layer ACL through through-holes formed to penetrate the first insulating layer FIL and the second insulating layer SIL.

[0136] A third insulating layer (TIL) can be disposed on the second insulating layer (SIL) to cover the input electrode (IE) and the output electrode (OE). The third insulating layer (TIL) can be formed as a single layer or multiple layers. For example, a single layer may include an organic layer. Multiple layers may include organic and inorganic layers. The third insulating layer (TIL) may be a planarization layer providing a flat top surface. A light-emitting element layer (DP-EDL) can be disposed on the third insulating layer (TIL).

[0137] Figure 5 This is an enlarged cross-sectional view of a flexible display panel according to an exemplary embodiment, and Figure 6 It is shown as an example Figure 5 The diagram shows the arrangement of the light-emitting element, the first electrode, and the second electrode.

[0138] Reference Figure 5 and Figure 6 According to an exemplary embodiment, the flexible display panel DP2 may include a first substrate BS1 and a second substrate BS2. Each of the first substrate BS1 and the second substrate BS2 may be a glass substrate.

[0139] The display circuit layer DP-CL can be disposed on the first substrate BS1. The display circuit layer DP-CL may include a first thin-film transistor TR1, a second thin-film transistor TR2, and multiple insulating layers L1 to L5. The structure of the first thin-film transistor TR1, the second thin-film transistor TR2, and the insulating layers L1 to L5 is similar to... Figure 4C The structure of the display circuit layer DP-CL is roughly similar, therefore, its repeated description will be omitted to avoid redundancy.

[0140] The first dividing portion BR1 and the second dividing portion BR2 can be disposed on the fifth insulating layer L5. For example... Figure 6 As shown, each of the first dividing portion BR1 and the second dividing portion BR2 may extend along a second direction DR2. The second dividing portion BR2 may be spaced apart from the first dividing portion BR1 along a first direction DR1. The first dividing portion BR1 and the second dividing portion BR2 may comprise substantially the same material. For example, the first dividing portion BR1 and the second dividing portion BR2 may comprise organic materials.

[0141] A first electrode E1 may be disposed on a first separating portion BR1, and a second electrode E2 may be disposed on a second separating portion BR2. The first electrode E1 may extend along a second direction DR2 to cover the first separating portion BR1, and the second electrode E2 may extend along the second direction DR2 to cover the second separating portion BR2. More specifically, the first separating portion BR1 may be disposed between the first electrode E1 and the fifth insulating layer L5, and the second separating portion BR2 may be disposed between the second electrode E2 and the fifth insulating layer L5.

[0142] A through-hole can be provided in the fifth insulating layer L5, and a portion of the connecting electrode CNE can be exposed through the through-hole. The first electrode E1 can be electrically connected to the exposed portion of the connecting electrode CNE.

[0143] The first electrode E1 may include a first reflective electrode RFE1 and a first covering electrode CPE1, and the second electrode E2 may include a second reflective electrode RFE2 and a second covering electrode CPE2.

[0144] Each of the first reflective electrode RFE1 and the second reflective electrode RFE2 may include a reflective material. Each of the first reflective electrode RFE1 and the second reflective electrode RFE2 may have a single-layer structure or a multilayer structure in which multiple layers are stacked. For example, each of the first reflective electrode RFE1 and the second reflective electrode RFE2 may have a structure in which indium tin oxide (ITO), silver (Ag), and indium tin oxide (ITO) are stacked in sequence.

[0145] The first covering electrode CPE1 may be configured to cover the first reflective electrode RFE1, and the second covering electrode CPE2 may be configured to cover the second reflective electrode RFE2. Each of the first covering electrode CPE1 and the second covering electrode CPE2 may include at least one of, for example, indium zinc oxide (IZO), indium tin oxide (ITO), indium gallium oxide (IGO), indium zinc gallium oxide (IGZO), and mixtures / compounds thereof.

[0146] A sixth insulating layer L6 may be disposed on the first electrode E1, the fifth insulating layer L5, and the second electrode E2, at least between the first separating portion BR1 and the second separating portion BR2. Specifically, in the region between the first covering electrode CPE1 and the second covering electrode CPE2, the sixth insulating layer L6 may be disposed on the fifth insulating layer L5, the first covering electrode CPE1, and the second covering electrode CPE2. The sixth insulating layer L6 may partially overlap with the first covering electrode CPE1, and the sixth insulating layer L6 may partially overlap with the second covering electrode CPE2. For example, the sixth insulating layer L6 may be disposed on the first covering electrode CPE1 to at least partially overlap with the first separating portion BR1, and the sixth insulating layer L6 may be disposed on the second covering electrode CPE2 to at least partially overlap with the second separating portion BR2. However, the inventive concept is not limited to the specific structure of the sixth insulating layer L6, and in some exemplary embodiments, the sixth insulating layer L6 may not overlap with the first separating portion BR1 and the second separating portion BR2.

[0147] Multiple light-emitting elements (EDs) can be disposed on the sixth insulating layer L6. Multiple EDs can be connected in parallel. Multiple EDs can be aligned along the second direction DR2.

[0148] The light-emitting element ED can be electrically connected to the first electrode E1 and the second electrode E2. The light-emitting element ED can be disposed between the first electrode E1 and the second electrode E2. Each light-emitting element ED can be configured to have two opposing ends, one of which overlaps with the first electrode E1, and the other of which overlaps with the second electrode E2.

[0149] The length LT of each light-emitting element (ED) can range from a few nanometers to hundreds of micrometers. For example, the length LT of each ED can range from about 1 micrometer to about 100 micrometers.

[0150] The distance WT between the first electrode E1 and the second electrode E2 along the first direction DR1 can be less than the length LT of each light-emitting element ED along the first direction DR1. In the region between the first electrode E1 and the second electrode E2, the light-emitting element ED can be spaced apart from the sixth insulating layer L6. Therefore, a gap can be formed between the light-emitting element ED and the sixth insulating layer L6.

[0151] The light-emitting element ED can be electrically connected to the first electrode E1 through the first connecting electrode CNE1, and the light-emitting element ED can be electrically connected to the second electrode E2 through the second connecting electrode CNE2.

[0152] The first connecting electrode CNE1 can be disposed on the light-emitting element ED, the sixth insulating layer L6, and the first electrode E1. Specifically, for example, the first connecting electrode CNE1 can be electrically connected to a portion of the first covering electrode CPE1 exposed by the sixth insulating layer L6.

[0153] The second connecting electrode CNE2 can be disposed on the light-emitting element ED, the sixth insulating layer L6, and the second electrode E2. Specifically, for example, the second connecting electrode CNE2 can be electrically connected to a portion of the second covering electrode CPE2 exposed by the sixth insulating layer L6.

[0154] A seventh insulating layer L7 can be disposed on the second connecting electrode CNE2. Even when the light-emitting element ED is formed to a size equal to or less than a few hundred micrometers in length, the second connecting electrode CNE2 and the first connecting electrode CNE1 can be kept from direct contact with each other by means of the seventh insulating layer L7. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the first connecting electrode CNE1 and the second connecting electrode CNE2 can be formed concurrently by the same process. In this case, the seventh insulating layer L7 can be omitted.

[0155] The first connecting electrode CNE1 and the second connecting electrode CNE2 may include conductive materials. For example, the conductive materials may include at least one of indium zinc oxide (IZO), indium tin oxide (ITO), indium gallium oxide (IGO), indium zinc gallium oxide (IGZO), and mixtures / compounds thereof. However, the inventive concept is not limited thereto. For example, the conductive material may be a metallic material including molybdenum, silver, titanium, copper, aluminum, or alloys thereof.

[0156] The encapsulation layer TFE can be formed on the first connecting electrode CNE1 and the seventh insulating layer L7. The encapsulation layer TFE may include a first inorganic layer IL1, an organic layer OL, and a second inorganic layer IL2 stacked sequentially. The organic layer OL may be disposed between the first inorganic layer IL1 and the second inorganic layer IL2. The first inorganic layer IL1 and the second inorganic layer IL2 can be formed by depositing inorganic materials, and the organic layer OL can be formed by depositing, printing, or coating organic materials.

[0157] A light-blocking layer (BML), a color filter layer (CF), a color conversion layer (CCL), a first protective layer (PL1), and a second protective layer (PL2) can be disposed on the surface of the second substrate (BS2). The structure of the second substrate (BS2) can be the same as described above. Figures 4A to 4C The structures described are roughly similar, therefore, repeated descriptions of them will be omitted.

[0158] In the display area DA, the adhesive filler layer AFL may be positioned between the second protective layer PL2 and the encapsulation layer TFE to form a cell gap. In the non-display area NDA, the adhesive filler layer AFL may be in contact with the first substrate BS1 and the second substrate BS2. The first substrate BS1 and the second substrate BS2 can be adhered to each other by the adhesive properties of the adhesive filler layer AFL. Furthermore, the space between the first substrate BS1 and the second substrate BS2 can be sealed tightly by the adhesive filler layer AFL. For example, the adhesive filler layer AFL may comprise epoxy resin.

[0159] In some exemplary embodiments, the adhesive filler layer AFL may be an optically transparent adhesive (OCA) film, an optically transparent resin (OCR) film, or a pressure-sensitive adhesive (PSA) film.

[0160] Figures 7A to 7D This illustrates the manufacturing process according to an exemplary embodiment. Figure 3 A plan view of the process of making flexible display panels, and Figures 8A to 8F This illustrates the manufacturing process according to an exemplary embodiment. Figure 3 A cross-sectional view of the process of making a flexible display panel.

[0161] Reference Figure 7A and Figure 8AThe first working substrate WS1 may include a plurality of first unit regions CR1. Each first unit region CR1 may be a first substrate BS1 connected to the display panel DP (e.g., see...). Figure 3 The corresponding area. The display circuit layer DP-CL, the light-emitting element layer DP-EDL, and the encapsulation layer TFE can be sequentially formed on each first unit area CR1 of the first working substrate WS1. Although in Figure 7A and Figure 8A Only the light-emitting element layer DP-EDL is shown in the figure, but the concept of the present invention is not limited thereto.

[0162] Reference Figure 7B and Figure 8B The second working substrate WS2 may include multiple second unit regions CR2. Each second unit region CR2 may be a second substrate BS2 connected to the display panel DP (e.g., see...). Figure 3 The corresponding area. Light-blocking layer BML (see...) Figure 4B ), color filter layers CF1 to CF3 (see Figure 4B ), first protective layer PL1 and second protective layer PL2 (see Figure 4B At least one of the color conversion layer CCL and the color conversion layer CCL can be formed on each second unit region CR2 of the second working substrate WS2. For ease of illustration, in Figure 7B and Figure 8B Only the color conversion layer (CCL) is shown in the image.

[0163] Reference Figure 7C and Figure 8C The adhesive filler layer AFL can be disposed on the first working substrate WS1. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the adhesive filler layer AFL can be disposed on at least one of the first working substrate WS1 and the second working substrate WS2.

[0164] For example, the adhesive filler layer AFL may include epoxy resin. In some exemplary embodiments, the adhesive filler layer AFL may be an optically clear adhesive (OCA) film, an optically clear resin (OCR) film, or a pressure-sensitive adhesive (PSA) film.

[0165] Reference Figure 7D and Figure 8D After forming an adhesive filler layer AFL on one of the first working substrate WS1 and the second working substrate WS2, the first working substrate WS1 and the second working substrate WS2 can be coupled to each other. Hereinafter, the first working substrate WS1 and the second working substrate WS2 coupled to each other can be referred to as the working panel WP.

[0166] Next, the work panel WP can be divided into multiple blocks, each block comprising a corresponding unit area from unit areas CR1 and CR2. For example, the work panel WP can be cut along the first cutting line CL1-1 and the second cutting line CL1-2 using a cutting wheel CH to form unit bars. Each unit bar can be further cut along the third cutting line CL2-1 and the fourth cutting line CL2-2.

[0167] Here, each cut block of the work panel WP can be referred to as the initial display panel. Specifically, Figure 8E The preliminary display panel P-WP shown can be formed by cutting the working panel WP.

[0168] Reference Figure 8E The preliminary display panel P-WP may include a first preliminary substrate P-BS1 and a second preliminary substrate P-BS2. The thickness of the first preliminary substrate P-BS1 and the thickness of the second preliminary substrate P-BS2 may be defined as a first preliminary thickness pt1 and a second preliminary thickness pt2. For example, each of the first preliminary thickness pt1 and the second preliminary thickness pt2 may be in the range of about 0.4 mm to about 0.7 mm.

[0169] The first preliminary substrate P-BS1 and the second preliminary substrate P-BS2, each having a first preliminary thickness pt1 and a second preliminary thickness pt2, can be etched using an etching process. The etching process can be performed by immersing the preliminary display panel P-WP in an etching solution or by spraying the etching solution onto both sides of the preliminary display panel P-WP.

[0170] According to an exemplary embodiment, each of the first preliminary substrate P-BS1 and the second preliminary substrate P-BS2 of the preliminary display panel P-WP can be etched. During the etching process, the rear surface of the first preliminary substrate P-BS1 and the front surface of the second preliminary substrate P-BS2 can be etched respectively.

[0171] When etching the preliminary display panel P-WP by a spray coating method, the etching process may include a process of etching a first preliminary substrate P-BS1 (hereinafter referred to as the "first etching process") and a process of etching a second preliminary substrate P-BS2 (hereinafter referred to as the "second etching process"). According to exemplary embodiments, the first etching process and the second etching process may be performed simultaneously, and in some exemplary embodiments, the first etching process and the second etching process may be performed in a non-concurrent manner (e.g., with differences in start time or time interval).

[0172] When the first etching process and the second etching process are performed under the same process conditions, the first preliminary substrate P-BS1 and the second preliminary substrate P-BS2 can be etched by approximately the same amount. As another example, when the first etching process and the second etching process are performed under different process conditions, the first preliminary substrate P-BS1 and the second preliminary substrate P-BS2 can be etched by different amounts.

[0173] When each of the first preliminary substrate P-BS1 and the second preliminary substrate P-BS2 is etched using an etching process, as follows: Figure 8F As shown, a flexible display panel DP having a first substrate BS1 and a second substrate BS2 can be formed. According to an exemplary embodiment, the first substrate BS1 and the second substrate BS2 may each have a first thickness t1 and a second thickness t2. For example, each of the first thickness t1 and the second thickness t2 may be in the range of about 0.01 mm to about 0.2 mm.

[0174] Figure 8F The example shows that the first thickness t1 and the second thickness t2 are equal to each other, but the inventive concept is not limited thereto. For example, in some exemplary embodiments, within the aforementioned thickness range, the first thickness t1 of the first substrate BS1 and the second thickness t2 of the second substrate BS2 may be different from each other.

[0175] Figure 9A This is according to an exemplary embodiment. Figure 2A A magnified view of part "A1", and Figure 9B This is an enlarged view of part "A1" according to another exemplary embodiment.

[0176] Reference Figure 9A A portion of the flexible display panel DP can be attached and secured to roller 31. For example, the flexible display panel DP can be secured to a portion of roller 31 via an adhesive layer AL. For example, the adhesive layer AL can be a double-sided tape with adhesive properties. Therefore, one surface of the adhesive layer AL can be attached and secured to roller 31, and the other surface of the adhesive layer AL can be attached and secured to a portion of the flexible display panel DP.

[0177] Figure 9A An illustrative illustration shows the adhesive layer AL being attached to a first substrate FS of a flexible display panel DP, but the inventive concept is not limited thereto. For example, in some exemplary embodiments, the substrate closer to roller 31 of the first substrate FS and the second substrate SS may contact the adhesive layer AL. If roller 31 is closer to the second substrate SS than to the first substrate FS, the adhesive layer AL may contact the second substrate SS.

[0178] Reference Figure 9B According to another exemplary embodiment, the flexible display panel DP can be secured to the roller 31 via an auxiliary sheet AS. In this case, one end of the auxiliary sheet AS can be secured to the flexible display panel DP via a first adhesive layer AL1, and the opposite end of the auxiliary sheet AS can be secured to a portion of the roller 31 via a second adhesive layer AL2. For example, each of the first adhesive layer AL1 and the second adhesive layer AL2 can be a double-sided adhesive tape with adhesive properties.

[0179] Figure 10 This is a cross-sectional view of a display device according to an exemplary embodiment, and Figure 11 This is a cross-sectional view showing a display device according to an exemplary embodiment.

[0180] Reference Figure 10 The display device 102 according to an exemplary embodiment may further include a reinforcing plate RFB, which is located between the main circuit board MCB and the first substrate FS to enhance the mechanical strength of the first substrate FS. The reinforcing plate RFB may be disposed on the rear surface of the first substrate FS. The reinforcing plate RFB can enhance the mechanical strength of the first substrate FS at a second side. Specifically, the reinforcing plate RFB can prevent the first substrate FS from being damaged by external forces or stresses applied to the first substrate FS during the attachment of the main circuit board MCB and the flexible circuit board FCB to the second side of the first substrate FS.

[0181] The reinforcing plate RFB can be fastened to the rear surface of the first substrate FS using an adhesive layer or the like. For example, the adhesive layer can be double-sided tape with adhesive properties. Therefore, the adhesive layer can fasten the main circuit board MCB to the reinforcing plate RFB.

[0182] Figure 10 An exemplary illustration shows a reinforcing plate RFB disposed on a second side of the first substrate FS, but the inventive concept is not limited thereto. For example, the location of the reinforcing plate RFB can be determined based on the location of the drive circuit unit, which includes the main circuit board MCB and the flexible circuit board FCB. More specifically, when the drive circuit unit is disposed on a first side of the first substrate FS, the reinforcing plate RFB can also be disposed on a first side of the first substrate FS to absorb shocks that may occur during the coupling process between the first substrate FS and the drive circuit unit.

[0183] Reference Figure 11In the display device 103 according to an exemplary embodiment, the first substrate FS and the second substrate SS may have different thicknesses than each other. For example, the first thickness t1 of the first substrate FS may be less than the second thickness t2 of the second substrate SS. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the second thickness t2 of the second substrate SS may be less than the first thickness t1 of the first substrate FS.

[0184] For example, the first thickness t1 of the first substrate FS and the second thickness t2 of the second substrate SS can have the relationship described in Table 1 below.

[0185] [Table 1]

[0186]

[0187] Figure 12 This is a perspective view of a display device according to an exemplary embodiment, and Figure 13 It shows Figure 12 A front view of the display device in standby mode. Figure 14A and Figure 14B This is a cross-sectional view showing the standby state of a display device according to an exemplary embodiment.

[0188] Reference Figure 12 and Figure 13 In the display device 105 according to an exemplary embodiment, the housing 30 may include a transmissive window 33 that exposes a portion of the flexible display panel DP. For example, the transmissive window 33 may be formed in the front portion of the housing 30. In this case, the front portion of the housing 30 may be defined as a portion corresponding to the portion of the flexible display panel DP where an image is displayed to the user.

[0189] The housing 30 can be formed of an opaque material. In this case, for example, a transmission window 33 can be formed by partially opening the front of the housing 30, and the transmission window 33 can be covered by a transparent layer.

[0190] In the active state, the image may not be displayed through the transmission window 33, while in the standby state, the standby image can be displayed through the transmission window 33. The standby image may be an image displayed through the first area SDA of the flexible display panel DP. More specifically, in the active state, the first area SDA can be turned off so that the standby image is not displayed, and in the standby state, the first area SDA can be turned on to display the standby image. As another example, in the active state, the transmission window 33 may be shielded by an additional shielding member.

[0191] For example, the standby image may include, but is not limited to, information related to at least one of the following: date, time, day of the week, weather, temperature, and news headlines.

[0192] Specifically, refer to Figure 14A In standby mode, the flexible display panel DP is wound around roller 31. In this case, the area not wound around roller 31 and corresponding to the transmissive window 33 can be defined as the first area SDA. If the display device 105 becomes active, the first area SDA can be included in the display area DA and can be used to display images.

[0193] However, in some exemplary embodiments, a standby image can still be displayed through the transmission window 33 during the active state. Specifically, another area of ​​the flexible display panel DP located within the housing 30 can be operated to display the standby image.

[0194] Reference Figure 14B The housing 30 may further include a sub-transmissive window 35. The sub-transmissive window 35 may be disposed at the rear of the housing 30 to expose another area, namely, a second area of ​​the flexible display panel DP. The rear of the housing 30 may be defined as the portion of the flexible display panel DP opposite to the portion that displays the image to the user. In standby mode, the second area can display a sub-standby image through the sub-transmissive window 35.

[0195] The transmission window 33 and the sub-transmission window 35 may have different sizes, and the images set through the transmission window 33 and the sub-transmission window 35 may be the same or different from each other.

[0196] Figure 15A This is a cross-sectional view showing the standby state of a display device according to another exemplary embodiment, and 15B is an exemplary illustration. Figure 15A A front view of the display device in standby mode.

[0197] Reference Figure 15A and Figure 15B When the display device according to another exemplary embodiment is in a standby state, the display device may include a fastening frame 40 disposed in the housing 38.

[0198] The housing 38 may include a transmissive window 33 that exposes a region of the flexible display panel DP. For example, the transmissive window 33 may be located in the front portion of the housing 38. In standby mode, a standby image can be displayed through the transmissive window 33. For example, such as... Figure 15B As shown, the standby image may include, but is not limited to, information about at least one of the following: date, time, day of the week, weather, temperature, and news headlines.

[0199] In standby mode, the transmission window 33 may not overlap with the fastening frame 40. Specifically, the fastening frame 40 may not be exposed through the transmission window 33. The housing 38 may include a space therein that can accommodate the fastening frame 40 without obstructing the transmission window 33. Furthermore, a door 39 may be formed in a portion of the housing 38 and may be opened or closed to selectively allow the fastening frame 40 to pass through. Thus, in standby mode, when the fastening frame 40 is accommodated in the housing 38, the door 39 may be closed, and in active mode, the door 39 may be opened, and the fastening frame 40 may be pulled to the outside of the housing 38 through the open door 39.

[0200] Figure 16A and Figure 16B This is a cross-sectional view showing the active state of a display device according to an exemplary embodiment.

[0201] Reference Figure 16A and Figure 16B According to an exemplary embodiment, the display device 106 may include a first housing 30 in which a first roller 31 is housed and a second housing 36 in which a second roller 37 is housed.

[0202] A first side of the flexible display panel DP can be secured to a first roller 31, and a second side of the flexible display panel DP can be secured to a second roller 37. When the display device 106 is in standby mode, the flexible display panel DP can be wound around at least one of the first roller 31 and the second roller 37, and can be housed in a corresponding housing of a first housing 30 and a second housing 36. For example, if the flexible display panel DP is wound around the first roller 31, the second housing 36 can move toward the first housing 30 and can contact the first housing 30.

[0203] When the display device 106 is activated, the flexible display panel DP can be unfolded from the first roller 31 and can be stretched, and the distance between the second housing 36 and the first housing 30 can be maintained at a specific value.

[0204] In some exemplary embodiments, the display device 106 may further include a strain gauge disposed at each of the first and second sides of the flexible display panel DP to measure changes in the mechanical properties of the flexible display panel DP in a standby state.

[0205] If the signal measured by the strain gauge exceeds a predetermined critical range (hereinafter referred to as "abnormal deformation"), the winding position of the flexible display panel DP can be adjusted. For example, if abnormal deformation is detected when the flexible display panel DP is wound around the first roller 31 in a standby state, the winding position of the flexible display panel DP can be automatically adjusted so that the flexible display panel DP is wound around the second roller 37. In this way, changes in the mechanical properties of the flexible display panel DP that may occur when the winding position of the flexible display panel DP is maintained for a long time can be prevented.

[0206] Figure 16A An exemplary illustration shows the rear surfaces of the first and second sides of the first substrate FS being fastened to the first roller 31 and the second roller 37, respectively, but the inventive concept is not limited thereto.

[0207] For example, such as Figure 16B As shown, in the display device 107 according to another exemplary embodiment, the rear surface of the first side portion of the first substrate FS can be fastened to the first roller 31, and the front surface of the second side portion of the second substrate SS can be fastened to the second roller 37. In this case, the front surface can be defined as the surface that displays an image to the user HE, and the rear surface can be defined as the surface opposite to the front surface, and the user HE cannot see the rear surface.

[0208] Figure 17A and Figure 17B This is a cross-sectional view showing the active state of a double-sided display device according to an exemplary embodiment.

[0209] Reference Figure 17A According to an exemplary embodiment, the display device 110 may include a housing 50 in which a first roller 51 and a second roller 52 are housed, as well as a first fastening frame 41 and a second fastening frame 42. The display device 110 may include a first flexible display panel DP1 fastened to the first roller 51 and a second flexible display panel DP2 fastened to the second roller 52.

[0210] The first side of the first flexible display panel DP1 can be fastened to the first roller 51, and the second side of the first flexible display panel DP1 can be fastened to the first fastening frame 41. The first side of the second flexible display panel DP2 can be fastened to the second roller 52, and the second side of the second flexible display panel DP2 can be fastened to the second fastening frame 42.

[0211] like Figure 17AAs shown, the first flexible display panel DP1 can display an image along a third direction DR3, and the second flexible display panel DP2 can display an image along a fourth direction DR4, opposite to the third direction DR3. Therefore, the first user HE1 can identify the image displayed through the first flexible display panel DP1 at a first position, and the second user HE2 can identify the image displayed through the second flexible display panel DP2 at a second position. Specifically, Figure 17A The display device 110 can display images along two different directions (e.g., third direction DR3 and fourth direction DR4).

[0212] Figure 17A The first fastening frame 41 and the second fastening frame 42 are shown as separate from each other, but the inventive concept is not limited thereto. For example, in some exemplary embodiments, the first fastening frame 41 and the second fastening frame 42 may be coupled to each other, or the first fastening frame 41 and the second fastening frame 42 may be separable from each other. Thus, when an image is displayed in only one direction, the first fastening frame 41 and the second fastening frame 42 may be separated from each other, and only one fastening frame may move.

[0213] Reference Figure 17B According to an exemplary embodiment, the display device 111 may include: a housing 50 in which a third roller 53 and a fourth roller 54 are housed, a fastening frame 45 in which a fifth roller 46 is housed, and a flexible display panel DP3.

[0214] One side of the flexible display panel DP3 can be fastened to the third roller 53, and the opposite side of the flexible display panel DP3 can be fastened to the fourth roller 54. The fifth roller 46 can be fastened to the center portion of the flexible display panel DP3.

[0215] The third roller 53 and the fourth roller 54 can rotate in opposite directions. In standby mode, a first portion of the flexible display panel DP3 can be wound around the third roller 53 and housed in the housing 50, and a second portion of the flexible display panel DP3 can be wound around the fourth roller 54 and housed in the housing 50. The first portion of the flexible display panel DP3 can be defined as a portion located on one side of the central portion of the flexible display panel DP3, with the fifth roller 46 placed at this portion, and the second portion can be defined as another portion located on the opposite side of the central portion.

[0216] In the active state, the first portion of the flexible display panel DP3 can be unfolded and stretched from the third roller 53, and the second portion can be unfolded and stretched from the fourth roller 54. In this state, the first user HE1 can recognize the image displayed on the first display area DA1 of the stretched portion of the flexible display panel DP3. The second user HE2 can recognize the image displayed on the second display area DA2 of the stretched portion of the flexible display panel DP3.

[0217] The fastening frame 45 may have a receiving space therein to accommodate the fifth roller 46. The fastening frame 45 may also include additional mechanical components for supporting the flexible display panel DP in the unfolded state and for maintaining its active position. For example, the mechanical components may be coupled to the fifth roller 46 to lift the fastening frame 45 in an upward direction, and when the fastening frame 45 is placed in its maximum lifted position, the mechanical components consistently maintain the distance between the fifth roller 46 and the housing 50.

[0218] Figure 18 This is a plan view illustrating a structure in which the flexible display panel and the inner roller are coupled to each other according to an exemplary embodiment. Figure 19 yes Figure 18 The cross-sectional view of the flexible display panel shown, and Figure 20 This is a cross-sectional view illustrating a structure in which the dual rollers and the flexible display panel are coupled to each other according to an exemplary embodiment.

[0219] Reference Figures 18 to 20 According to an exemplary embodiment, the flexible display panel DP may include a first substrate FS and a second substrate SS. A flexible circuit board FCB may be attached to a portion of the first substrate FS. In the pad area FA to which the flexible circuit board FCB is attached on the side, the first substrate FS may have a third thickness t3 that is greater than a first thickness t1. Specifically, in order to enhance the mechanical strength of the first substrate FS in the pad area FA to which the flexible circuit board FCB is attached, the first substrate FS may have a third thickness t3 that is greater than the first thickness t1 of other areas.

[0220] like Figure 19 and Figure 20 As shown, the display device according to an exemplary embodiment may include: an outer roller 62 around which a flexible display panel DP is wound, and an inner roller 61 around which a flexible circuit board FCB is wound.

[0221] Multiple adhesive film CNFs can be disposed between the inner roller 61 and the flexible circuit board FCB. The adhesive film CNFs can be connected to the flexible circuit board FCB via coupling members SW. The adhesive film CNFs can be attached and secured to the inner roller 61. A portion of the flexible circuit board FCB can be wound around the inner roller 61 via the adhesive film CNFs.

[0222] The opposite portion of the flexible circuit board FCB can be pulled outside the outer roller 62. Therefore, a portion of the flexible display panel DP with the FCB attached can be wound around the outer roller 62. In this way, the FCB and the flexible display panel DP, respectively, can be configured to be separated from each other around the rollers they are wound on. Thus, the high-stiffness FCB can be wound around the inner roller 61 with a small diameter, and the relatively low-stiffness flexible display panel DP can be wound around the outer roller 62 with a larger diameter. In this way, the stress applied to the flexible display panel DP can be reduced.

[0223] According to an exemplary embodiment, the flexible display panel of a rollable display device may include two thin glass substrates, which may be coupled to each other using an adhesive filler layer. Therefore, the stress applied to the flexible display panel during the roll-up operation can be reduced.

[0224] Furthermore, sections that may be vulnerable to external impacts (such as those around the rollers or to which flexible circuit boards are attached) can have structures that enhance the mechanical strength of the flexible display panel. Therefore, deformation or damage to the flexible display panel can be prevented or at least suppressed.

[0225] Although certain exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Therefore, the inventive concept is not limited to these embodiments, but is limited to the broader scope of this disclosure and various obvious modifications and equivalent arrangements as will be apparent to those skilled in the art.

Claims

1. A display device, wherein, The display device includes: A flexible display panel having a side portion and an opposite side portion; A roller, which is disposed on the side portion of the flexible display panel and configured to wind the flexible display panel; A driving circuit, the driving circuit including a main circuit board and a flexible circuit board, the flexible circuit board being disposed on the opposite side of the flexible display panel and configured not to be wound by the roller; A fastening frame, which is fastened to the opposite side of the flexible display panel and houses the flexible circuit board therein; and A reinforcing film is disposed between the main circuit board and the opposite side of the flexible display panel. The reinforcing film is disposed adjacent to the flexible circuit board and on the rear surface of the opposite side of the flexible display panel, and is housed within the fastening frame. The reinforcing film is located between the main circuit board and a first substrate of the flexible display panel to enhance the mechanical strength of the first substrate, and one end of the reinforcing film abuts against the interior of the fastening frame. The flexible display panel includes: The first substrate includes: a first base substrate having adjacent display areas and non-display areas; and a light-emitting element layer including a plurality of light-emitting elements disposed on the display areas of the first base substrate; The second substrate includes: a second base substrate opposite to the first base substrate; a color conversion layer disposed on the second base substrate and corresponding to each of the plurality of light-emitting elements; and a protective layer covering the color conversion layer; and An adhesive filler layer is disposed in the display area to form a cell gap between the light-emitting element layer of the first substrate and the protective layer of the second substrate, and the adhesive filler layer is disposed in the non-display area to contact the first substrate and the second substrate to couple and seal the first substrate and the second substrate. The adhesive filler layer does not contact the first substrate and the second substrate in the display area. The first substrate further includes a pad area for mounting the flexible circuit board, and the thickness of the first substrate in the pad area is greater than the thickness in the display area.

2. The display device according to claim 1, wherein, The first substrate and the second substrate comprise glass material.

3. The display device according to claim 1, wherein, The adhesive filler layer comprises a transparent epoxy resin.

4. The display device according to claim 1, wherein, Each of the first and second substrates has a thickness ranging from 0.01 mm to 0.2 mm.

5. The display device according to claim 4, wherein, The thickness of the first substrate and the thickness of the second substrate are equal to or different from each other.

6. The display device according to claim 1, wherein, The reinforcing membrane is located on the rear surface of the first substrate.

7. The display device according to claim 1, wherein, The display device further includes an adhesive layer that secures the side portion of the flexible display panel to the roller.

8. The display device according to claim 1, wherein, The display device further includes: An auxiliary sheet is disposed between the side portion of the flexible display panel and the roller; A first adhesive layer secures the auxiliary sheet to the side portion of the flexible display panel; and A second adhesive layer secures the auxiliary sheet to the roller.

Images