Display device

Abstract

This display device comprises: a display assembly comprising a first area defined by a first direction and a second direction intersecting the first direction, and a second area which, in an inserted state, extends from the first area and is disposed beneath the first area, and of which, in an unfolded state, at least a portion provides the same plane as the first area; and an extension module disposed beneath the first area, the extension module comprising a first portion coupled to one end of the second area and extending in the second direction, a second portion disposed on one side of the first portion in the first direction and extending in the second direction, fixing pins each comprising a body portion extending in the first direction and penetrating at least one of the first portion or the second portion and a head portion disposed at one end of the body portion, and elastic bodies disposed between the head portions and the penetrated first portion or second portion, wherein, when the display assembly transitions from the inserted state to the unfolded state, the distance the first portion moves may be substantially the same as the distance the second portion moves.

Description

display device

[0001] The present invention relates to a display device.

[0002] Electronic devices such as smartphones, digital cameras, laptops, navigation systems, and smart televisions that typically provide images to users include a display device for displaying the images. The display device generates the images and presents them to the user through a display screen.

[0003] With recent technological advancements in display devices, various forms of display devices are being developed. For example, flexible display devices that can slide or extend beyond the case are being developed. Flexible display devices, which can change shape in various ways, are easy to carry and can enhance user convenience.

[0004] The purpose of the present invention is to provide a display device having improved surface quality of a display module.

[0005] According to one embodiment of the present invention, a display device includes a display assembly including a first region defined by a first direction and a second direction intersecting the first direction, and a second region extending from the first region and disposed below the first region in an inserted state and providing at least a portion of the second region with the same plane as the first region in an unfolded state, an expansion module disposed below the first region, the expansion module including a first portion coupled to one end of the second region and extending in the second direction, a second portion disposed on one side of the first portion in the first direction and extending in the second direction, a body portion extending in the first direction and penetrating at least one of the first portion or the second portion, and a fixing pin including a head portion disposed at one end of the body portion, and an elastic body disposed between the penetrating first portion or the second portion and the head portion, when the display assembly changes from the inserted state to the unfolded state, a moving distance of the first portion and a moving distance of the second portion may be substantially the same.

[0006] A display device according to one embodiment of the present invention comprises: a display assembly including a first region defined by a first direction and a second direction intersecting the first direction, and a second region extending from the first region and disposed below the first region in an inserted state, and providing at least a portion of the second region with the same plane as the first region in an unfolded state; and an expansion module disposed below the first region, wherein the expansion module includes a first portion coupled to one end of the second region and extending in the second direction, a second portion disposed on one side of the first portion within the first direction and extending in the second direction, a body portion extending in the first direction and penetrating at least one of the first portion or the second portion, and a head portion disposed at one end of the body portion; and an elastic body disposed between the head portion and the first portion or the second portion penetrating from the first portion or the second portion, when the display assembly changes from the inserted state to the unfolded state, a movement distance of the first portion may be greater than a movement distance of the second portion.

[0007] According to an embodiment of the present invention, as the elastic body relaxes, an elastic force can be applied to the support bar, the connecting portion, and the display module. The elastic force can flatten the deformed portion of the display assembly. Consequently, the surface quality of the display module can be improved.

[0008] FIG. 1 is an electronic device including a display device according to one embodiment of the present invention.

[0009] FIG. 2a is a drawing for explaining the display device shown in FIG. 1.

[0010] FIG. 2b is a drawing for explaining the unfolding mode of the display device shown in FIG. 2a.

[0011] Figure 3 is an exploded perspective view of the display device illustrated in Figure 2b.

[0012] Figure 4 is a cross-sectional view corresponding to line Ⅰ-Ⅰ' shown in Figure 3.

[0013] FIG. 5a is a drawing for explaining the display assembly shown in FIG. 3.

[0014] Figure 5b is a drawing for explaining the support bars shown in Figure 5a.

[0015] FIG. 5c is a drawing for explaining a display assembly according to one embodiment of the present invention.

[0016] Figure 5d is an enlarged plan view of the first region shown in Figure 5c.

[0017] Fig. 6 is a drawing illustrating an example of a cross-section of the display module illustrated in Fig. 5a.

[0018] Fig. 7 is a drawing illustrating a cross-section of the display panel illustrated in Fig. 6.

[0019] Figures 8a to 8c are drawings for explaining the driving unit of the expansion module.

[0020] FIGS. 9a and 9b are drawings for explaining a connection part according to one embodiment of the present invention.

[0021] Figure 9c is a drawing for explaining an elastic body according to one embodiment.

[0022] FIG. 9d is a drawing for explaining a connection part according to one embodiment.

[0023] Figures 9e and 9f are drawings for explaining the combination of the connecting portion and the driving portion.

[0024] FIG. 10a is a drawing for explaining a moving plate according to one embodiment of the present invention.

[0025] Figures 10b and 10c are drawings for explaining the combination of the driving unit and the moving plate.

[0026] Figure 11a is a perspective view illustrating the combination of support bars and expansion modules.

[0027] Figure 11b is a cross-sectional view corresponding to line Ⅱ-Ⅱ' shown in Figure 11a.

[0028] Fig. 12a is a perspective view for explaining the unfolding mode of the expansion module illustrated in Fig. 11a.

[0029] Figure 12b is a cross-sectional view corresponding to line Ⅲ-Ⅲ' shown in Figure 12a.

[0030] Figure 12c is a drawing for explaining the moving distance of the moving plate and the tension bar.

[0031] Figures 13a to 13e are drawings for explaining a display device according to a comparative example.

[0032] FIGS. 14A to 14E are drawings for explaining a wrinkle improvement mechanism according to an embodiment of the present invention.

[0033] FIG. 15a and FIG. 15b are drawings showing the height of the wrinkles of the display module (DM) according to the elastic modulus of the elastic body shown in FIG. 14a.

[0034] FIGS. 16A to 16E are cross-sectional views of a display device according to one embodiment of the present invention.

[0035] FIGS. 17a and 17b are drawings for explaining a connection part according to one embodiment.

[0036] Figures 18a to 18c are drawings for explaining the operation of the connection part illustrated in Figure 17a.

[0037] FIGS. 19A to 19C are drawings for explaining a display device according to one embodiment of the present invention.

[0038] FIGS. 20A and 20B are drawings for explaining a driving unit according to one embodiment of the present invention.

[0039] FIGS. 21A and 21B are drawings for explaining a driving unit according to one embodiment of the present invention.

[0040] In this specification, when it is said that a component (or region, layer, portion, etc.) is “on,” “connected to,” or “coupled to” another component, it means that it can be directly disposed / connected / coupled to the other component, or a third component may be disposed between them.

[0041] Identical drawing numbers indicate identical components. Furthermore, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the purpose of effectively illustrating the technical content. "And / or" encompasses any combination of one or more of the associated components.

[0042] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a "second component," and similarly, a second component may also be referred to as a "first component." Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0043] Additionally, terms such as "below," "lower," "above," and "upper" are used to describe the relationships between components depicted in the drawings. These terms are relative concepts and are explained based on the directions indicated in the drawings.

[0044] It should be understood that terms such as "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. Furthermore, terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an overly idealistic or overly formal sense unless explicitly defined herein.

[0046] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0047] FIG. 1 is an electronic device (ED) including a display device (DD) according to one embodiment of the present invention. FIG. 2a is a drawing for explaining the display device (DD) illustrated in FIG. 1. FIG. 2b is a drawing for explaining the unfolding mode of the display device illustrated in FIG. 2a.

[0048] For convenience of explanation, the keyboard and mouse pad illustrated in FIG. 1 are omitted in FIGS. 2A and 2B. In addition, in FIGS. 2A and 2B, the front of the display device (DD) is illustrated facing upward.

[0049] Referring to Figure 1, the electronic device (ED) is depicted as a laptop, but may be any device activated by an electrical signal. The electronic device (ED) may include various embodiments. For example, the electronic device (ED) may be applied to electronic devices such as smartwatches, tablets, smartphones, computers, smart televisions, and navigation systems.

[0050] Referring to FIG. 2A, for example, the display device (DD) may have a rectangular shape having a long side extending in a first direction (DR1) and a short side extending in a second direction (DR2). However, the present invention is not limited thereto, and the display device (DD) may have various shapes, such as a circle and a polygon.

[0051] The front surface of the display device (DD) may be defined as a display surface (DS), and the display surface (DS) may have a plane defined by a first direction (DR1) and a second direction (DR2). An image or video generated in the display device (DD) may be provided to a user through the display surface (DS).

[0052] A display surface (DS) may include a display area (DA) and a non-display area (NDA) surrounding the display area (DA). The display area (DA) may display an image, and the non-display area (NDA) may not display an image. The non-display area (NDA) may surround the display area (DA).

[0053] Referring to FIGS. 2A and 2B, FIG. 2A illustrates a display device (DD) in an insertion mode (or an inserted state), and FIG. 2B illustrates a display device (DD) in an unfolding mode (or an unfolding state).

[0054] The display device (DD) may include a display assembly (PCR) and a case (CS) housing the display assembly (PCR). The display assembly (PCR) may include a display module (DM). The display module (DM) may be exposed to the outside through an opening (OP) defined in the upper portion of the case (CS) in an insertion mode. In practice, the upper surface of the display module (DM) may be a display surface (DS).

[0055] The case (CS) may include a main case (MCS) and a plurality of moving cases (MVS). The main case (MCS) and the moving cases (MVS) may be coupled to each other to accommodate a display assembly (PCR). The moving cases (MVS) may be coupled to the main case (MCS) to move in a first direction (DR1).

[0056] As illustrated in Fig. 2a, the area of ​​the display surface (DS) of the display assembly (PCR) exposed to the outside can be set to a minimum when the moving case (MVS) is closest to the main case (MCS). This state of the display device (DD) can be defined as an insertion mode (or insertion state).

[0057] The area of ​​the display surface (DS) can be adjusted according to the movement of the moving cases (MVS). For example, the moving cases (MVS) can be moved in a first direction (DR1) by an external force applied by a user. As illustrated in Fig. 2b, as the moving cases (MVS) move, the area of ​​the display surface (DS) of the display assembly (PCR) exposed to the outside increases, allowing the user to view images on a larger screen.

[0058] A state of the display device (DD) in which the area of ​​the display surface (DS) of the display assembly (PCR) exposed to the outside increases compared to the insertion mode illustrated in Fig. 2a may be defined as an unfolded mode (or unfolded state). Meanwhile, a state in which the area of ​​the display surface (DS) of the display assembly (PCR) exposed to the outside no longer increases may be defined as a maximum unfolded mode (or maximum unfolded state).

[0059] As previously described, the moving cases (MVS) are moved in the first direction (DR1) by an external force applied by the user, but this may not be limited thereto. For example, the moving cases (MVS) may also be moved by the motor and gears within the case (CS).

[0060] Although not shown, a portion of the display module (DM) that is not exposed to the outside, other than the display surface (DS) exposed through the opening (OP) in the insertion mode, may be placed within the case (CS).

[0061] Fig. 3 is an exploded perspective view of the display device (DD) illustrated in Fig. 2b. Fig. 4 is a cross-sectional view corresponding to the line Ⅰ-Ⅰ' illustrated in Fig. 3.

[0062] For example, Fig. 3 is an exploded perspective view of a display device (DD) in unfolded mode. However, Fig. 3 does not depict the maximum unfolded mode.

[0063] Referring to FIGS. 3 and 4, the display device (DD) may include a display assembly (PCR), an expansion module (EMD), and a case (CS). The case (CS) may include a main case (MCS) and moving cases (MVS).

[0064] A main case (MCS) may include a main bottom portion (MBP) and a plurality of main sidewall portions (MSW). The main bottom portion (MBP) may have a plane defined by a first direction (DR1) and a second direction (DR2).

[0065] The main sidewall portions (MSW) can be arranged on opposite sides of the main bottom portion (MBP) that are opposed to each other in the second direction (DR2). The main sidewall portions (MSW) can extend in a third direction (DR3) from opposite sides of the main bottom portion (MBP) that are opposed to each other in the second direction (DR2). The main sidewall portions (MSW) can face each other in the second direction (DR2).

[0066] The main sidewall portions (MSW) may be parallel to planes defined by the first direction (DR1) and the third direction (DR3), and may extend longer in the first direction (DR1) than in the third direction (DR3). The main sidewall portions (MSW) facing each other may be symmetrical to each other in the second direction (DR2).

[0067] Main guide grooves (MGR) may be defined on the inner surfaces of the main sidewalls (MSW) facing each other. Each of the main guide grooves (MGR) may extend in a first direction (DR1). Two pairs of main guide grooves (MGR) may face each other in a second direction (DR2). Each pair of main guide grooves (MGR) may be arranged in a third direction (DR3).

[0068] The moving cases (MVS) can be arranged in the first direction (DR1). The moving cases (MVS) can be placed on the main floor portion (MBP). The moving cases (MVS) can be placed between the main sidewall portions (MSW).

[0069] Each of the moving cases (MVS) may include a moving floor portion (VBP), a plurality of first moving side wall portions (VSW1), and a second moving side wall portion (VSW2). For convenience of explanation, one of the moving cases (MVS) among the plurality of moving cases (MVS) is described below, but another moving case (MVS) among the plurality of moving cases (MVS) may also have substantially the same configuration.

[0070] The moving floor portion (VBP) may be parallel to a plane defined by the first direction (DR1) and the second direction (DR2). The moving floor portion (VBP) may be disposed on the main floor portion (MBP).

[0071] The first moving side wall portions (VSW1) can extend in a third direction (DR3) from opposite sides of the moving floor portion (VBP) in the second direction (DR2). The first moving side wall portions (VSW1) can face each other in the second direction (DR2). The first moving side wall portions (VSW1) can be arranged between the inner surfaces of the main side wall portions (MSW) that face each other in the second direction (DR2).

[0072] The first moving side wall portions (VSW1) may have planes defined by the first direction (DR1) and the third direction (DR3), and may extend longer in the first direction (DR1) than in the third direction (DR3). The first moving side wall portions (VSW1) facing each other may be symmetrical to each other in the second direction (DR2).

[0073] Movable projections (MPR) may be arranged on the outer surfaces of the first moving sidewalls (VSW1). The movable projections (MPR) may extend in a first direction (DR1). A plurality of movable projections (MPR) may be arranged on one outer surface, and the plurality of movable projections (MPR) may be arranged in a third direction (DR3).

[0074] Each of the movable projections (MPR) can be positioned in a corresponding main guide groove (MGR) among the main guide grooves (MGR). When viewed in the first direction (DR1), the shape of the outer surface of the movable projections (MPR) can correspond to the shape of the main guide grooves (MGR).

[0075] The moving projections (MPR) can reciprocate in a first direction (DR1) along the main guide grooves (MGR). Accordingly, the moving cases (MVS) can move in the first direction (DR1) with respect to the main case (MCS). As the moving cases (MVS) move in the first direction (DR1), the overlapping area between the main bottom portion (MBP) and the moving bottom portion (VBP) can be varied.

[0076] The second moving side wall portion (VSW2) may be positioned at one end of the first moving side wall portion (VSW1) that is located farther from the center area of ​​the main floor portion (MBP) among the opposite ends of the first moving side wall portion (VSW1) in the first direction (DR1). The second moving side wall portion (VSW2) may have a plane defined by the second direction (DR2) and the third direction (DR3), and may extend longer in the second direction (DR2) than in the third direction (DR3).

[0077] An expansion module (EMD) may include a driving unit (DU, see FIG. 8a), a plurality of connecting units (CPP, see FIG. 9a), moving plates (MVP, see FIG. 10a), and a plurality of rollers (ROL, see FIG. 10a). The expansion module (EMD) may be accommodated in a case (CS). The expansion module (EMD) may be expanded and contracted in a first direction (DR1). Although not illustrated, the expansion module (EMD) may be connected to moving cases (MVS). Accordingly, when the moving cases (MVS) move in the first direction (DR1), the expansion module (EMD) may be expanded. A detailed description of the expansion module (EMD) will be described later.

[0078] A display assembly (PCR) may be placed on an expansion module (EMD). The display assembly (PCR) may be accommodated within a case (CS). Opposite sides of the display assembly (PCR) in the first direction (DR1) may have a convex curved shape facing outward. The portion of the display assembly (PCR) having the convex curved shape may be accommodated within the case (CS) and not exposed to the outside.

[0079] FIG. 5a is a drawing for explaining the display assembly (PCR) illustrated in FIG. 3. FIG. 5b is a drawing for explaining the support bars (SSB) illustrated in FIG. 5a. FIG. 5c is a drawing for explaining the display assembly (PCRa) according to another embodiment of the present invention. FIG. 5d is an enlarged plan view of the first area (AA1) illustrated in FIG. 5c.

[0080] By way of example, FIGS. 5A and 5C are perspective views illustrating a display assembly (PCR, PCRa) in a fully unfolded state. FIG. 5B is a perspective view illustrating support bars (SSB) in a fully unfolded state. The fully unfolded display assembly (PCR, PCRa) is a display assembly (PCR, PCRa) that is unfolded further than the display assembly (PCR, PCRa) in the maximum unfolded mode and is separated from the expansion module (EMD).

[0081] For example, FIG. 5b illustrates support bars (SSB) arranged on the left side of the fixed plate (SPL) of FIG. 5a, but support bars (SSB) arranged on the right side of the fixed plate (SPL) may also have substantially the same structure.

[0082] Referring to FIG. 5A, the display assembly (PCR) may include a first region (A1) and second regions (A2) extending in the first direction (DR1) from opposite sides of the first region (A1) in the first direction (DR1).

[0083] The first region (A1) can be exposed to the outside of the case (CS) of FIG. 3 regardless of the insertion mode of FIG. 2a and the unfolding mode of FIG. 2b. The first region (A1) can be parallel to a plane defined by the first direction (DR1) and the second direction (DR2).

[0084] Depending on the insertion mode and unfolding mode of the display device (DD), the area of ​​the second regions (A2) exposed to the outside of the case (CS) may vary. When the display device (DD) is in unfolding mode, a portion of the second regions (A2) may be exposed to the outside and may be flatly disposed on both sides of the first region (A1) that are opposite to each other in the first direction (DR1). As illustrated in FIG. 3 , when the display device (DD) is accommodated in the case (CS), a portion of the second regions (A2) may be disposed below the first region (A1). This will be described in detail with reference to FIGS. 11A to 12B .

[0085] A display assembly (PCR) may include a display module (DM), a joint (JPT), and a support plate (SPT). The display module (DM) may have a rectangular shape having long sides extending in a first direction (DR1) and short sides extending in a second direction (DR2).

[0086] A display module (DM) may include a fixing portion (FA) and extension portions (EXA) extending from the fixing portion (FA). The fixing portion (FA) may overlap a first area (A1). Each of the extension portions (EXA) may overlap a corresponding second area (A2) among the second areas (A2). The fixing portion (FA) may be exposed to the outside of the case (CS) regardless of the insertion mode and the unfolding mode of the display device (DD). Depending on the insertion mode and the unfolding mode of the display device (DD), the area exposed to the outside of the case (CS) may vary. When the display device (DD) is in the unfolding mode, some of the extension portions (EXA) may be exposed to the outside and may be flatly disposed on opposite sides of the fixing portion (FA) that are opposite to each other in the first direction (DR1).

[0087] When the display device (DD) is in insertion mode, some of the extensions (EXA) can be positioned under the fixation part (FA).

[0088] Referring to FIGS. 5A and 5B, a support plate (S`PT) may be positioned below a display module (DM). The support plate (SPT) may include a fixing plate (SPL) and a plurality of support bars (SSB). The fixing plate (SPL) may have a plane defined by a first direction (DR1) and a second direction (DR2). The fixing plate (SPL) may overlap a fixing portion (FA). The fixing plate (SPL) may support the fixing portion (FA) below the fixing portion (FA).

[0089] The support bars (SSB) may be positioned below the extensions (EXA). The support bars (SSB) may overlap the extensions (EXA). The support bars (SSB) may be positioned on opposite sides of the fixed plate (SPL) in the first direction (DR1). The support bars (SSB) and the fixed plate (SPL) may be arranged in the first direction (DR1).

[0090] The support bars (SSB) may be arranged in a first direction (DR1) and may extend in a second direction (DR2). Among the plurality of support bars (SSB), the support bar (SSB) furthest from the fixed plate (SPL) may be defined as a coupling support bar (COB). The coupling support bar (COB) may be coupled to the expansion module (EMD) illustrated in FIG. 3. The coupling of the coupling support bar (COB) and the expansion module (EMD) will be described in detail in FIGS. 11b and 12b.

[0091] The fixed plate (SPL) and the support bars (SSB) may include a metal material such as stainless steel (e.g., SUS 316), but the metal material of the fixed plate (SPL) and the support bars (SSB) is not limited thereto. The fixed plate (SPL) and the support bars (SSB) may include a non-metal material such as plastic.

[0092] The joint (JPT) can be positioned between the display module (DM) and the support plate (SPT). The joint (JPT), when fully unfolded, can be parallel to a plane defined by the first direction (DR1) and the second direction (DR2).

[0093] The joint (JPT) can provide a flat upper surface on the lower surface of the display module (DM). Although not shown, an adhesive may be disposed between the joint (JPT) and the display module (DM). The joint (JPT) and the display module (DM) can be bonded to each other by the adhesive. The joint (JPT) can include polyimide, polycarbonate, urethane, silicone, or polyethyleneterephthalate. However, the joint (JPT) is not limited thereto and may include metal. This will be described in detail with reference to FIGS. 5c and 5d.

[0094] The support plate (SPT) may be attached to the lower surface of the joint portion (JPT). Although not shown, the support plate (SPT) and the joint portion (JPT) may be bonded to each other using an adhesive. If the joint portion (JPT) is not used, the display module (DM) may be placed on the support bars (SSB). In this case, since the support bars (SSB) are spaced apart from each other, the display module (DM) overlapping between the support bars (SSB) may sag downward. Therefore, the surface quality of the display module (DM) may be degraded.

[0095] However, since the joint (JPT) is positioned between the display module (DM) and the support plate (SPT), the joint (JPT) can provide a flat upper surface to the display module (DM). The display module (DM) can be maintained in a flat state by the joint (JPT).

[0096] Referring to FIGS. 5c and 5d, the joint (JPTa) may include a metal material such as stainless steel (e.g., SUS 316), but the metal material of the joint (JPTa) is not limited thereto.

[0097] The joint (JPTa) may include a fixed region (JFA) and extended regions (JEX) extending from the fixed region (JFA). The fixed region (JFA) may overlap the fixed region (FA). The extended regions (JEX) may overlap the extended regions (EXA). The extended regions (JEX) may be arranged on opposite sides of the fixed region (JFA) in the first direction (DR1).

[0098] The expansion areas (JEX) may include a plurality of first expansion portions (PT1) and a plurality of second expansion portions (PT2). The first expansion portions (PT1) and the second expansion portions (PT2) may be arranged alternately in a first direction (DR1). The second expansion portions (PT2) may be arranged between the first expansion portions (PT1) that are adjacent to each other in the first direction (DR1). The first expansion portions (PT1) may overlap with the support bars (SSB) illustrated in FIG. 5B. The support bars (SSB) may be arranged on the lower surface of the first expansion portions (PT1). The second expansion portions (PT2) may overlap with the area between the support bars (SSB) illustrated in FIG. 5B.

[0099] A plurality of openings (LOP) may be formed in the second extensions (PT2). The openings (LOP) may be arranged in a first direction (DR1) and a second direction (DR2). The openings (LOP) may extend longer in the second direction (DR2) than in the first direction (DR1). In the order of orientation in the first direction (DR1), the openings (LOP) arranged in the h-th row may be arranged alternately with the openings (LOP) arranged in the h+1-th row. The row may correspond to the second direction (DR2). h is a natural number.

[0100] The second extensions (PT2) may include first branches (BR1) and second branches (BR2). The first branches (BR1) may be arranged between openings (LOP) that are adjacent to each other in the first direction (DR1). The second branches (BR2) may be arranged between openings (LOP) that are adjacent to each other in the second direction (DR2). The first branches (BR1) may extend in the second direction (DR2), and the second branches (BR2) may extend in the first direction (DR1). The openings (LOP) may be defined by the first and second branches (BR1, BR2).

[0101] By forming openings (LOP), the rigidity of the expansion areas (JEX) can be reduced and the flexibility can be increased. As a result, as illustrated in FIG. 3, when the two opposing sides of the display module (DM) in the first direction (DR1) have a convex curved shape facing outward, the expansion areas (JEX) can be easily bent.

[0102] Fig. 6 is a drawing illustrating an example of a cross-section of the display module illustrated in Fig. 5a.

[0103] Referring to FIG. 6, the display module (DM) may include a display panel (DP), an input sensing unit (ISP), an anti-reflection layer (RPL), a window (WIN), and a panel protection film (PPF).

[0104] The display panel (DP) may be a flexible display panel. The display panel (DP) according to one embodiment of the present invention may be an emissive display panel, and is not particularly limited thereto. For example, the display panel (DP) may be an organic light-emitting display panel or an inorganic light-emitting display panel. The emissive layer of the organic light-emitting display panel may include an organic light-emitting material. The emissive layer of the inorganic light-emitting display panel may include quantum dots, quantum rods, and the like. Hereinafter, the display panel (DP) will be described using an organic light-emitting display panel as an example.

[0105] An input sensing unit (ISP) may be arranged on a display panel (DP). The input sensing unit (ISP) may include a plurality of sensing units (not shown) for sensing an external input using a capacitive method. The input sensing unit (ISP) may be manufactured directly on the display panel (DP) during the manufacturing of the display device (DD). However, the present invention is not limited thereto, and the input sensing unit (ISP) may be manufactured as a separate panel from the display panel (DP) and attached to the display panel (DP) by an adhesive layer.

[0106] An anti-reflection layer (RPL) may be disposed on the input sensing portion (ISP). The anti-reflection layer (RPL) may be defined as an external light anti-reflection film. The anti-reflection layer (RPL) may reduce the reflectance of external light incident from above the display device (DD, see FIG. 1) toward the display panel (DP). For example, the anti-reflection layer (RPL) may include a plurality of color filters that display the same color as the pixels of the display panel (DP).

[0107] Color filters can filter external light to the same color as the pixels. In this case, the external light may not be visible to the user. However, the present invention is not limited thereto, and the anti-reflection layer (RPL) may include a phase retarder and / or a polarizer to reduce the reflectance of external light.

[0108] The window (WIN) can be placed on an anti-reflection layer (RPL). The window (WIN) can protect the display panel (DP), the input sensing unit (ISP), and the anti-reflection layer (RPL) from external scratches and impacts.

[0109] A panel protection film (PPF) may be placed under the display panel (DP). The panel protection film (PPF) may protect the lower portion of the display panel (DP). The panel protection film (PPF) may include a flexible plastic material such as polyethylene terephthalate (PET).

[0110] Although not shown, an adhesive layer may be disposed between a display panel (DP) and a panel protection film (PPF), and the display panel (DP) and the panel protection film (PPF) may be bonded to each other by the adhesive layer. Although not shown, an adhesive layer may be disposed between a window (WIN) and an anti-reflection layer (RPL), and the window (WIN) and the anti-reflection layer (RPL) may be bonded to each other by the adhesive layer.

[0111] Fig. 7 is a drawing illustrating a cross-section of the display panel illustrated in Fig. 6.

[0112] Referring to FIG. 7, the display panel (DP) may include a substrate (SUB), a circuit element layer (DP-CL) disposed on the substrate (SUB), a display element layer (DP-OLED) disposed on the circuit element layer (DP-CL), and a thin film encapsulation layer (TFE) disposed on the display element layer (DP-OLED).

[0113] The substrate (SUB) may include a display area (DA) and a non-display area (NDA) surrounding the display area (DA). The substrate (SUB) may include a flexible plastic material such as polyimide (PI). A display element layer (DP-OLED) may be disposed on the display area (DA).

[0114] A plurality of pixels may be arranged on the circuit element layer (DP-CL) and the display element layer (DP-OLED). Each pixel may include transistors arranged on the circuit element layer (DP-CL) and light-emitting elements arranged on the display element layer (DP-OLED) and connected to the transistors.

[0115] A thin film encapsulation layer (TFE) can be disposed on a circuit element layer (DP-CL) to cover a display element layer (DP-OLED). The thin film encapsulation layer (TFE) can protect pixels from moisture, oxygen, and external foreign substances.

[0116] Figures 8a to 8c are perspective views of the driving unit (DU) of the expansion module (EMD).

[0117] For example, FIGS. 8a and 8b illustrate the driving unit (DU) in the unfolding mode, and FIG. 8c illustrates the driving unit (DU) in the insertion mode.

[0118] Referring to FIGS. 8A to 8C, the expansion module (EMD) of FIG. 3 may include a driving unit (DU). The driving unit (DU) may be expandable and contractible in a first direction (DR1). The driving unit (DU) may include a main plate (MPL), a first arm (AM1) coupled to the main plate (MPL), and a second arm (AM2). The main plate (MPL) may have a rectangular shape having a short side extending in the first direction (DR1) and a long side extending in the second direction (DR2).

[0119] The first arm (AM1) and the second arm (AM2) may be coupled to the lower surface of the main plate (MPL). The first arm (AM1) and the second arm (AM2) may have shapes that are symmetrical to each other in the second direction (DR2) and may have a foldable pantograph structure designed to unfold or fold in the first direction.

[0120] The first arm (AM1) may include a first joint unit (SM1-1) and a plurality of first joint units (SM1-2). The first joint unit (SM1-1) may be rotatably coupled to a lower surface of the main plate (MPL). The first joint unit (SM1-1) may be rotated about a center pin (CPU) to be described later. The first joint unit (SM1-1) may be rotated about a rotational axis parallel to the third direction (DR3).

[0121] The first-second joint units (SM1-2) can be coupled to both sides of the first-first joint unit (SM1-1). The first-second joint units (SM1-2) can be rotatably coupled to the first-first joint unit (SM1-1) by a plurality of first pins (PU1). The first-second joint units (SM1-2) can be rotated by a predetermined first angle (FDR1) with respect to the first-first joint unit (SM1-1).

[0122] The first-first joint unit (SM1-1) and the first-second joint units (SM1-2) are foldably connected to be extended or folded in the first direction (DR1), so that the first arm (AM1) can be extended or contracted in the first direction (DR1).

[0123] The first arm (AM1) may include a plurality of first pin protrusions (FPT1) and a plurality of second pin protrusions (FPT2). The first pin protrusions (FPT1) may be arranged on the upper surface of the first-second joint units (SM1-2). The first pin protrusions (FPT1) may be arranged between the first pins (PU1) and third pins (PU3) to be described later.

[0124] The second pin protrusions (FPT2) may be arranged on the lower surface of the first-second joint units (SM1-2). The second pin protrusions (FPT2) may be arranged adjacent to one side of the first-second joint units (SM1-2). The one side of the first-second joint units (SM1-2) may be defined as the side that is arranged farther away from the first pins (PU1). The first pin protrusions (FPT1) may be closer to the first pins (PU1) than the second pin protrusions (FPT2).

[0125] The second arm (AM2) may include a second-first joint unit (SM2-1) and a plurality of second-second joint units (SM2-2). The second-first joint unit (SM2-1) may be coupled to a lower surface of the main plate (MPL) to rotate about a rotational axis parallel to the third direction (DR3). The second-first joint unit (SM2-1) may rotate about a central pin (CPU).

[0126] The second-second joint units (SM2-2) can be rotatably coupled to the second-first joint unit (SM2-1) by a plurality of second pins (PU2). The second-second joint unit (SM2-2) can be rotated by a predetermined second angle (FDR2) with respect to the second-first joint unit (SM2-1). The size of the second angle (FDR2) can be substantially the same as the size of the first angle (FDR1).

[0127] The second-first joint unit (SM2-1) and the second-second joint unit (SM2-2) are foldably connected to be extended or folded in the first direction (DR1), so that the second arm (AM2) can be extended or contracted in the first direction (DR1).

[0128] The second arm (AM2) may include a plurality of third pin protrusions (FPT3) and a plurality of fourth pin protrusions (FPT4). The third pin protrusions (FPT3) may be arranged on the upper surface of the second-second joint units (SM2-2). The third pin protrusions (FPT3) may be arranged between the second pins (PU2) and the third pins (PU3) described below.

[0129] The fourth pin protrusions (FPT4) may be arranged on the lower surface of the second-second joint units (SM2-2). The fourth pin protrusions (FPT4) may be arranged adjacent to one side of the second-second joint units (SM2-2). The one side of the second-second joint units (SM2-2) may be defined as the side that is arranged farther away from the second pins (PU2). The third pin protrusions (FPT3) may be arranged closer to the second pins (PU2) than the fourth pin protrusions (FPT4).

[0130] The first arm (AM1) and the second arm (AM2) can be coupled to each other. The first-first joint units (SM1-1) and the first-second joint units (SM2-1) can be coupled and rotated by a center pin (CPU) under the main plate (MPL). The rotation direction of the second-first joint unit (SM2-1) can be opposite to that of the first-first joint unit (SM1-1). For example, when the display device (DD) changes from the insertion mode to the unfolding mode, the first-first joint units (SM1-1) can be rotated clockwise around a rotation axis parallel to the third direction (DR3), and the second-first joint units (SM2-1) can be rotated counterclockwise around a rotation axis parallel to the third direction (DR3).

[0131] Each of the first-second joint units (SM1-2) can be coupled with a corresponding second-second joint unit (SM2-2) among the second-second joint units (SM2-2). The first-second joint units (SM1-2) and the second-second joint units (SM2-2) can be coupled by third pins (PU3). When the display device (DD) changes from the insertion mode to the unfolding mode, the first-second joint units (SM1-2) and the second-second joint units (SM2-2) can be rotated in opposite directions.

[0132] When the driving unit (DU) is extended, the distance from both sides of the main plate (MPL) to the first and third pin protrusions (FPT1, FPT3) in the first direction (DR1) can increase. When the driving unit (DU) is extended, the distance from both sides of the main plate (MPL) to the second and fourth pin protrusions (FPT2, FPT4) in the first direction (DR1) can increase. A detailed description thereof will be given in Fig. 12.

[0133] FIGS. 9A and 9B are drawings for explaining a connection part (CPP) according to one embodiment of the present invention. FIG. 9C is a drawing for explaining an elastic body (SMDa) according to one embodiment. FIG. 9D is a drawing for explaining a connection part (CPPa) according to one embodiment. FIGS. 9E and 9F are drawings for explaining the coupling of a connection part (CPP) and a driving part (DU).

[0134] For example, FIGS. 9a to 9f are illustrated in perspective views.

[0135] For example, FIG. 9b is an exploded perspective view of the connecting portion (CPP) illustrated in FIG. 9a.

[0136] For example, FIG. 9e is a drawing illustrating a driving unit (DU) and a connecting unit (CPP) in insertion mode, and FIG. 9f is a drawing illustrating a driving unit (DU) and a connecting unit (CPP) in unfolding mode.

[0137] Referring to FIGS. 9A and 9B , the expansion module (EMD) of FIG. 3 may further include a plurality of connection portions (CPP). For example, the expansion module (EMD) may include two connection portions (CPP), but the number of connection portions (CPP) is not limited thereto. For convenience of explanation, one of the two connection portions (CPP) will be described below.

[0138] The connecting portion (CPP) may comprise a plurality of distinct portions. The connecting portion (CPP) may comprise a first portion (CTB) coupled to one end of a second region (A2, see FIG. 5a) and having first openings (PCO) defined therein, and a second portion (ETB) disposed on one side of the first portion (CTB) in the first direction (DR1) and extending in the second direction (DR2).

[0139] The connecting portion (CPP) may include fixed pins (CPN) coupled to the first portion (CTB) through the first opening (PCO) in the first direction (DR1) and a plurality of elastic bodies (SMD) arranged so as to have variable elasticity between the fixed pins (CPN) and the first portion (CTB). Hereinafter, the first portion (CTB) may be referred to as a connecting bar (CTB), and the second portion (ETB) may be referred to as a tension bar (ETB).

[0140] The tensile bar (ETB) may extend in the second direction (DR2). For example, when viewed from the second direction (DR2), the tensile bar (ETB) may have a shape that resembles a 'T' rotated 90 degrees. In one embodiment of the present invention, the tensile bar (ETB) may include a portion parallel to a plane defined by the second direction (DR2) and the third direction (DR3), and a portion parallel to a plane defined by the first direction (DR1) and the second direction (DR2).

[0141] The tensile bar (ETB) may include a bonding plate (EPL) and an insertion plate (ESW). The bonding plate (EPL) may be parallel to the planes defined by the first direction (DR1) and the second direction (DR2), and may extend longer in the second direction (DR2) than in the first direction (DR1).

[0142] A plurality of first guide grooves (GDR1) may be formed in the coupling plate (EPL). The first guide grooves (GDR1) may be formed adjacent to one side of the opposite sides of the coupling plate (EPL) in the first direction (DR1). One side of the opposite sides of the coupling plate (EPL) in the first direction (DR1) may be defined as the side positioned farther away from the connecting bar (CTB).

[0143] Each of the first guide grooves (GDR1) can extend in the second direction (DR2). The first guide grooves (GDR1) can be arranged in the second direction (DR2). By way of example, two first guide grooves (GDR1) are illustrated, but the number of first guide grooves (GDR1) is not limited thereto.

[0144] The insertion plate (ESW) may be positioned on the other side of the mating plate (EPL) that opposes each other in the first direction (DR1). The other side of the mating plate (EPL) that opposes each other in the first direction (DR1) may be defined as the side closer to the connecting bar (CTB). In practice, the mating plate (EPL) and the insertion plate (ESW) may be formed integrally.

[0145] The insertion plate (ESW) may be parallel to the planes defined by the second direction (DR2) and the third direction (DR3), and the insertion plate (ESW) may extend in the second direction (DR2). When viewed in the second direction (DR2), the upper and lower surfaces of the insertion plate (ESW), which are opposed to each other in the third direction (DR3), may protrude from the upper and lower surfaces of the bonding plate (EPL), respectively.

[0146] A plurality of insertion grooves (PCG) may be formed in the insertion plate (ESW). The insertion grooves (PCG) may be defined on one side of the opposite sides of the insertion plate (ESW) in a first direction (DR1). For example, when viewed in the first direction (DR1), the insertion grooves (PCG) may have a circular shape. For example, eight insertion grooves (PCG) are illustrated, but the number of insertion grooves (PCG) is not limited thereto. One side of the opposite sides of the insertion plate (ESW) in the first direction (DR1) may be defined as a side facing the connecting bar (CTB).

[0147] The insertion grooves (PCG) may be arranged in the second direction (DR2). For example, the spacing between adjacent insertion grooves (PCG) in the second direction (DR2) may be constant. However, the spacing between adjacent insertion grooves (PCG) in the second direction (DR2) may not be constant. This will be described in detail in FIG. 9d.

[0148] A plurality of first grooves (MPL1) may be defined on the upper surface of the insert plate (ESW). The first grooves (MPL1) may be defined between adjacent insert grooves (PCG) in the second direction (DR2). The first grooves (MPL1) may extend from the upper surface of the insert plate (ESW) toward the lower surface. The first grooves (MPL1) may have a shape corresponding to a square.

[0149] The tension bar (ETB) and the connecting bar (CTB) may be arranged in a first direction (DR1). The tension bar (ETB) and the connecting bar (CTB) may be arranged spaced apart from each other by a predetermined distance in the first direction (DR1). The connecting bar (CTB) may be arranged adjacent to one of the two opposite sides of the insert plate (ESW) in the first direction (DR1).

[0150] The connecting rod (CTB) may extend in the second direction (DR2). For example, when viewed from the second direction (DR2), the connecting rod (CTB) may have a shape that resembles a 'T' rotated 90 degrees. In one embodiment of the present invention, the connecting rod (CTB) may include a portion parallel to a plane defined by the second direction (DR2) and the third direction (DR3) and a portion parallel to a plane defined by the first direction (DR1) and the second direction (DR2).

[0151] The connecting bar (CTB) may include a connecting plate (CSW) and a penetration plate (CPL). The connecting plate (CSW) may be parallel to a plane defined by the first direction (DR1) and the second direction (DR2), and may extend longer in the second direction (DR2) than in the first direction (DR1).

[0152] A plurality of grooves (GR) may be defined on the upper surface of the connecting plate (CSW). The grooves (GR) may extend from one side to the other side of the opposite sides of the connecting plate (CSW) in a first direction (DR1). When viewed in the first direction (DR1), the grooves (GR) may have a shape corresponding to a portion of a circle. In one embodiment of the present invention, the grooves (GR) may be omitted. One side of the opposite sides of the connecting plate (CSW) in the first direction (DR1) may be defined as a side that is positioned farther away from the insertion plate (ESW) in the first direction.

[0153] The through plate (CPL) may be positioned on one of the two opposite sides of the connecting plate (CSW) in the first direction (DR1), facing the insert plate (ESW). In practice, the connecting plate (CSW) and the through plate (CPL) may be formed integrally.

[0154] The penetrating plate (CPL) may extend in the second direction (DR2). The length of the penetrating plate (CPL) in the third direction (DR3) may be longer than the length of the connecting plate (CSW) in the third direction (DR3). When viewed from the second direction (DR2), the upper and lower surfaces of the penetrating plate (CPL), which are opposed to each other in the third direction (DR3), may protrude further than the upper and lower surfaces of the connecting plate (CSW), respectively.

[0155] A plurality of first openings (PCO) may be formed in the through-hole plate (CPL). The first openings (PCO) may be defined as being continuous with the grooves (GR) in the first direction (DR1). For example, when viewed in the first direction (DR1), the first openings (PCO) may have a circular shape.

[0156] The first openings (PCO) may be arranged in the second direction (DR2). For example, the spacing between the first openings (PCO) adjacent to each other in the second direction (DR2) may be constant. The first openings (PCO) may be arranged to correspond to the insertion grooves (PCG). However, the spacing between the first openings (PCO) adjacent to each other in the second direction (DR2) may not be constant. This will be described in detail in FIG. 9d.

[0157] A plurality of second grooves (MPL2) may be defined on the upper surface of the through plate (CPL). When viewed in the second direction (DR2), the second grooves (MPL2) may be defined between first openings (PCO) that are adjacent to each other in the second direction (DR2). The second grooves (MPL2) may be arranged to correspond to the first grooves (MPL1).

[0158] Referring to FIGS. 9A and 9B, the elastic bodies (SMD) may be arranged in a second direction (DR2). For example, the spacing between the elastic bodies (SMD) adjacent to each other in the second direction (DR2) may be constant.

[0159] For example, the elastic bodies (SMD) may include compression springs. For example, the elastic modulus of the entire elastic bodies (SMD) may be from 500 gf to 5000 gf. The elastic modulus of each of the elastic bodies (SMD) may be the same. However, the present invention is not limited thereto, and the elastic modulus of at least one spring among the plurality of springs may be different from the elastic modulus of at least one other spring.

[0160] The shape of the elastic bodies (SMD) may correspond to the shape of the grooves (GR). For example, the elastic bodies (SMD) may have a cylindrical shape to correspond to the shape of the grooves (GR). However, the present invention is not limited thereto, and as illustrated in Fig. 9c, the elastic bodies (SMDa) may have a rectangular prism shape. In this case, the shape of the grooves (GR) may have a shape corresponding to a square.

[0161] Again, referring to FIGS. 9A and 9B , the fixed pins (CPN) may include head portions (FSP) and body portions (PCY). For example, the head portions (FSP) may have planes defined by the second direction (DR2) and the third direction (DR3).

[0162] The body parts (PCY) can extend from the head parts (FSP) in the first direction (DR1). The body parts (PCY) can have a shape corresponding to the springs of the elastic body (SMD). For example, the body parts (PCY) can have a cylindrical shape. However, this is merely an example, and if the elastic body (SMDa) has a square column shape as illustrated in FIG. 9c, the shape of the body parts (PCY) can be changed.

[0163] The fixed pins (CPN) may be arranged in a second direction (DR2). The spacing between the fixed pins (CPN) adjacent to each other in the second direction (DR2) may be constant. However, this is not limited thereto, and the spacing between the fixed pins (CPN) adjacent to each other in the second direction (DR2) may not be constant. This will be described in FIG. 9d.

[0164] The fixing pins (CPN) can penetrate the elastomers (SMD) and the connecting plate (CTB). The elastomers (SMD) can be arranged corresponding to the first openings (PCO) formed in the through plate (CPL). The fixing pins (CPN) penetrating the elastomers (SMD) and the through plate (CPL) can be coupled to the insertion grooves (PCG).

[0165] Although not shown, a plurality of protrusions are arranged on the outer surface of the body parts (PCY), and grooves corresponding to the protrusions are defined inside the insertion grooves (PCG), so that the body parts (PCY) can be coupled to the insertion grooves (PCG). However, the present invention is not limited thereto, and the body parts (PCY) and the insertion plate (ESW) can be coupled through welding. The elastic body (SMD), the connecting rod (CTB), and the tensile rod (ETB) can be coupled to each other by the fixing pin (CPN).

[0166] One side of the elastic bodies (SMD) can be in contact with the through plate (CPL), and the other side of the elastic bodies (SMD) can be in contact with the heads (FSP) of the fixing pins (CPN).

[0167] Referring to Fig. 9d, the fixing pins (CPN) may be arranged in the second direction (DR2). The spacing between adjacent fixing pins (CPN) in the second direction (DR2) may not be constant. The spacing between elastic bodies (SMD) coupled to the fixing pins (CPN) may not be constant. Although not shown, the spacing between the first openings (PCO, see Fig. 9b) formed in the through plate (CPL) in the second direction (DR2) may not be constant. In addition, the spacing between the insertion grooves (PCG, see Fig. 9b) defined in the insertion plate (ESW) in the second direction (DR2) may not be constant.

[0168] Hereinafter, the tension bar (ETB), connecting bar (CTB), elastic bodies (SMD), and fixing pins (CPN) have been described above, so their description will be omitted.

[0169] Referring to FIG. 9e, the connecting portion (CPP) can be coupled with the driving portion (DU). The first arm (AM1) and the second arm (AM2) of the driving portion (DU) can be coupled to the tension bar (ETB) of the connecting portion (CPP). The second pin protrusions (FPT2, see FIG. 8a) of the first arm (AM1) and the fourth pin protrusions (FPT4, see FIG. 8a) of the second arm (AM2) can be arranged in the first guide grooves (GDR1). The second pin protrusions (FPT2, see FIG. 8a) of the first arm (AM1) and the fourth pin protrusions (FPT4, see FIG. 8a) of the second arm (AM2) can move in the second direction (DR2) along the first guide grooves (GDR1).

[0170] Referring to FIGS. 9E and 9F, FIG. 9E is a drawing illustrating a driving unit (DU) and a connecting unit (CPP) in insertion mode, and FIG. 9F is a drawing illustrating a driving unit (DU) and a connecting unit (CPP) in unfolding mode.

[0171] As the first and second arms (AM1, AM2) are contracted in the first direction (DR1), the tension bar (ETB) and the connecting bar (CTB) can be moved closer to the main plate (MPL) in the first direction (DR1). When the first and second arms (AM1, AM2) are contracted in the first direction (DR1), the distance between the second pin protrusions (FPT2) and the fourth pin protrusions (FPT4) which are adjacent to each other in the second direction (DR2) can increase. When the first and second arms (AM1, AM2) are extended in the first direction (DR1), the distance between the second pin protrusions (FPT2) and the fourth pin protrusions (FPT4) which are adjacent to each other in the second direction (DR2) can decrease.

[0172] As the driving unit (DU) expands, the distance between the main plate (MPL) and the second pin protrusions (FPT2, see FIG. 8a) and the main plate (MPL) and the fourth pin protrusions (FPT4, see FIG. 8a) can increase.

[0173] When the first and second arms (AM1, AM2) extend in the first direction (DR1), the connecting portions (CPP) coupled to the second and fourth pin protrusions (FPT2, FPT4) can be moved away from the main plate (MPL) in the first direction (DR1).

[0174] Fig. 10a is a drawing for explaining a moving plate (MVP). Figs. 10b and 10c are drawings for explaining the combination of a driving unit (DU) and a moving plate (MVP).

[0175] For example, FIGS. 10a to 10c are illustrated in perspective views.

[0176] For example, Fig. 10b is the insert mode, and Fig. 10c is the unfold mode.

[0177] The driving unit (DU) and the connecting unit (CPP) of FIGS. 10b and 10c are the same as the driving unit (DU) of FIG. 8a and the connecting unit (CPP) of FIG. 9a, so their description will be omitted or simplified.

[0178] Referring to FIGS. 3, 10A, and 10B, the expansion module (EMD) of FIG. 3 may further include moving plates (MVP). The moving plates (MVP) may be arranged in a first direction (DR1). Below, one of the two moving plates (MVP) will be described, but the other moving plate (MVP) may also be substantially identical.

[0179] A moving plate (MVP) may include a stem portion (STP) and branch portions (BRP). The stem portion (STP) may extend in a second direction (DR2). Second guide grooves (GDR2) may be defined on one of the opposite sides of the stem portion (STP) in the first direction (DR1). The second guide grooves (GDR2) may extend in the second direction (DR2). The second guide grooves (GDR2) may be arranged in the second direction (DR2).

[0180] The branches (BRP) may extend from the stem (STP) in a first direction (DR1). In practice, the branches (BRP) and the stem (STP) may be formed integrally. The branches (BRP) may be arranged in a second direction (DR2). The spacing between the branches (BRP) adjacent to each other in the second direction (DR2) may be constant.

[0181] The expansion module (EMD) of FIG. 3 may include a plurality of rollers (ROL). For example, the rollers (ROL) may have a cylindrical shape. The rollers (ROL) may be arranged between branches (BRP) that are adjacent to each other in the second direction (DR2). The rollers (ROL) may be arranged adjacent to one side among the opposite sides of the branches (BRP) that are opposite to each other in the first direction (DR1). One side among the opposite sides of the branches (BRP) may be defined as a side that is arranged farther away from the stem (STP) along the first direction (DR1). The rollers (ROL) may rotate around a rotational axis (FX) that is parallel to the second direction (DR2).

[0182] Referring to FIG. 10b, the moving plate (MVP) can be coupled to the driving unit (DU) of FIG. 9e. The moving plate (MVP) can be disposed on the first arm (AM1) and the second arm (AM2). The first pin protrusions (FPT1) of the first arm (AM1) and the third pin protrusions (FPT3) of the second arm (AM2) can be disposed in the second guide grooves (GDR2) of the moving plate (MVP). The first pin protrusions (FPT1) and the third pin protrusions (FPT3) can move in the second direction (DR2) along the second guide grooves (GDR2).

[0183] A moving plate (MVP) can be arranged on a connecting portion (CPP). Branches (BRP) of the moving plate (MVP) can be arranged in first grooves (MPL1) defined on an upper surface of an insertion plate (ESW) and second grooves (MPL2) defined on an upper surface of a penetration plate (CPL). The first grooves (MPL1) and the second grooves (MPL2) can be arranged to have shapes corresponding to the branches (BRP). Accordingly, the connecting portion (CPP) can be moved in a first direction (DR1) along the branches (BRP).

[0184] Referring to FIGS. 10b and 10c, as the first and second arms (AM1, AM2) are contracted in the first direction (DR1), the moving plates (MVP) can be moved closer to the main plate (MPL) in the first direction (DR1). As the first and second arms (AM1, AM2) are contracted in the first direction (DR1), the distance between the first pin protrusions (FPT1) and the third pin protrusions (FPT3) adjacent to each other in the second direction (DR2) can be increased.

[0185] As the first and second arms (AM1, AM2) extend in the first direction (DR1), the moving plates (MVP) can be moved away from the main plate (MPL) in the first direction (DR1). A change in distance from the main plate (MPL) to the first and third protrusions (FPT1, FPT3) in the first direction (DR1) can be equal to a movement distance of the moving plate (MVP) connected to the first and third pin protrusions (FPT1, FPT3). When the first and second arms (AM1, AM2) extend in the first direction (DR1), a distance between the first pin protrusions (FPT1) and the third pin protrusions (FPT3) that are adjacent to each other in the second direction (DR2) can be reduced.

[0186] Fig. 11a is a perspective view for explaining the combination of the support bars and the expansion module (EMD). Fig. 11b is a cross-sectional view corresponding to the line II-II' shown in Fig. 11a. Fig. 12a is a perspective view for explaining the unfolding mode of the expansion module shown in Fig. 11a. Fig. 12b is a cross-sectional view corresponding to the line III-III' shown in Fig. 12a. Fig. 12c is a drawing for explaining the moving distance of the moving plate (MVP) and the tension bar (ETB).

[0187] For example, FIGS. 11a and 11b are drawings illustrating an expansion module (EMD) in insertion mode, and FIGS. 12a and 12b are drawings illustrating an expansion module (EMD) in unfolding mode.

[0188] For convenience of explanation, only the support bars (SSB) among the display assemblies (PCR) of FIGS. 11a and 12a are shown.

[0189] Referring to the drawings described above, among the components illustrated in FIGS. 11a to 12c, descriptions of components identical to the described components will be omitted or simplified.

[0190] Hereinafter, the support bars (SSB), connecting bars (CTB) and tension bars (ETB) arranged on the left side of the fixed plate (SPL) and the support bars (SSB), connecting bars (CTB) and tension bars (ETB) arranged on the right side of the fixed plate (SPL) are substantially the same, so the explanation will focus on the support bars (SSB), connecting bars (CTB) and tension bars (ETB) arranged on the left side of the fixed plate (SPL).

[0191] Referring to FIGS. 11A and 11B, in the insertion mode, the second regions (A2) of the display assembly (PCR) can be bent. A portion of the second regions (A2) can be positioned below the first region (A1). The expansion module (EMD) can be positioned between the first region (A1) and the second regions (A2). The display assembly (PCR) can be coupled to the expansion module (EMD). The second regions (A2) of the display assembly (PCR) can be coupled to a connecting bar (CTB) of the expansion module (EMD).

[0192] Some of the support bars (SSB) may be arranged under the moving plate (MVP). Some of the support bars (SSB) arranged under the moving plate (MVP) may be arranged in the first direction (DR1). Other of the support bars (SSB) may be arranged in a curved shape along the outer surface of the roller (ROL). The remaining of the support bars (SSB) may be arranged on top of the moving plate (MVP).

[0193] The support bars (SSB) can be coupled to the expansion module (EMD). Specifically, the coupling support bar (COB) can be coupled to the connecting bar (CTB). The coupling support bar (COB) can be coupled to the lower surface of the connecting plate (CSW). The remaining support bars (SSB) can be coupled to the connecting bar (CTB) by the coupling support bar (COB).

[0194] A fixed pin (CPN) penetrating the elastic body (SMD) and the through plate (CPL) compresses the elastic body (SMD) and can be coupled to the insertion plate (ESW). At this time, an elastic force is generated in the elastic body (SMD) to recover from the compressed state to the normal state. Here, the normal state means a state in which an elastic force is not generated in the elastic body (SMD). Hereinafter, a state in which the elastic body (SMD) is compressed to generate an elastic force may be defined as a first state, and a state in which the elastic body (SMD) is more relaxed than the first state may be defined as a second state.

[0195] The elastic force of the elastic body (SMD) is provided to the coupling support bar (COB) coupled to the penetration plate (CPL). Accordingly, tension may be generated in the display assembly (PCR). The tension acts in the opposite direction to the elastic force, and the tension is generated in the opposite direction from the first direction (DR1) toward the tension bar (ETB) from the coupling support bar (COB) with respect to the left connecting bar (CTB) as shown in Fig. 11b. The tension and elastic force may be in balance.

[0196] In insertion mode, the shortest distance from the fixed plate (SPL) to the rotation axis (FX) of the roller (ROL) may be defined as the first-first length (L1-1). The shortest distance from the fixed plate (SPL) to the coupling support bar (COB) may be defined as the second-first length (L2-1). The longest distance from the fixed plate (SPL) to the insertion plate (ESW) may be defined as the third-first length (L3-1). The distance between the tension bar (ETB) and the connecting bar (CTB) may be defined as the first distance (D1).

[0197] Referring to FIGS. 12A to 12C, as the first arm AM1 and the second arm AM2 extend in the first direction DR1, the first pin protrusions FPT1 of the first arm AM1 and the third pin protrusions FPT3 of the second arm AM2 can move in the first direction DR1 along the second guide grooves GDR2. The distance between the first pin protrusions FPT1 and the third pin protrusions FPT3 that are adjacent to each other in the second direction DR2 can be reduced. Accordingly, the moving plate MVP can be moved away from the main plate MPL in the first direction DR1.

[0198] As the moving plate (MVP) moves, a portion of the second regions (A2) may move from the lower portion of the moving plate (MVP) to the upper portion of the moving plate (MVP). A portion of the second regions (A2) may provide the same plane as the first region (A1).

[0199] When the moving plate (MVP) moves in the first direction (DR1), the rollers (ROL) coupled to the moving plate (MVP) can move in the same direction as the moving plate (MVP). The rollers (ROL) can rotate around the rotational axis (FX). For example, the rollers (ROL) can rotate clockwise.

[0200] When the roller (ROL) rotates, the support bars (SSB) arranged below the moving plate (MVP) and the support bars (SSB) arranged on the outer surface of the roller (ROL) can move upwards of the moving plate (MVP) along the outer surface of the roller (ROL). In the unfolding mode, the number of support bars (SSB) arranged on the moving plate (MVP) can increase. As illustrated in FIG. 2b, the area of ​​the display area (DA) exposed to the outside from the case (CS, see FIG. 2b) can increase.

[0201] The movement distance of the support bars (SSB) relative to the movement distance of the moving plate (MWP) may be different. For example, the movement distance of the support bars (SSB) relative to the movement distance of the moving plate (MWP) may be 1:2.

[0202] In unfolding mode, the shortest distance from the fixed plate (SPL) to the rotation axis (FX) of the roller (ROL) can be defined as the first-second length (L1-2). In unfolding mode, the shortest distance from the fixed plate (SPL) to the coupling support bar (COB) can be defined as the second-second length (L2-2).

[0203] The value obtained by subtracting the first-first length (L1-1) from the first-second length (L1-2) can be defined as the travel distance of the roller (ROL). The value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2) can be defined as the travel distance of the coupling support bar (COB).

[0204] The value obtained by subtracting the first-first length (L1-1) from the first-second length (L1-2) may be smaller than the value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2). The value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2) may be twice the value obtained by subtracting the first-first length (L1-1) from the first-second length (L1-2). Accordingly, the ratio of the movement distance of the connecting bar (CTB) connected to the connecting support bar (COB) and the movement distance of the moving plate (MVP) in the first direction (DR1) may be 1:2.

[0205] Referring to FIGS. 11b, 12b, and 12c, when the first arm (AM1) and the second arm (AM2) extend, the tension rods (ETB) coupled to the second and fourth pin protrusions (FPT2, FPT4, see FIG. 8a) of the first arm (AM1) and the second arm (AM2) can move in the first direction (DR1).

[0206] The movement distance of the connecting rod (CTB) relative to the movement distance of the moving plate (MVP) described above can be equally applied to the movement distance of the tension rod (ETB) relative to the movement distance of the moving plate (MVP). For convenience of explanation, in Fig. 12c, the first arm (AM1) and the second arm (AM2) are simply depicted as straight lines, and the first to fourth pin protrusions (FPT1 to FPT4) and the first and second pins (PU1, PU2) are simply depicted as dots.

[0207] As illustrated in FIG. 12c, a ratio of the movement distances of the second and fourth pin protrusions (FPT2, FPT4) to the movement distances of the first and third pin protrusions (FPT1, FPT3) may be 1:2. A movement distance of the tension rods (ETB) connected to the second and fourth pin protrusions (FPT2, FPT4) in the first direction (DR1) may be greater than a movement distance of the moving plate (MVP) connected to the first and third pin protrusions (FPT1, FPT3) in the first direction (DR1). A ratio of the movement distance of the tension rods (ETB) in the first direction (DR1) to the movement distance of the moving plate (MVP) in the first direction (DR1) may be 1:2. The movement distance of the tension bars (ETB) in the first direction (DR1) and the movement distance of the connecting bars (CTB) in the first direction (DR1) may be the same.

[0208] In the unfolded mode, the longest distance from the fixed plate (SPL) to the insertion plate (ESW) may be defined as the third-second length (L3-2). The third-second length (L3-2) minus the third-first length (L3-1) may be equal to the second-second length (L2-2) minus the second-first length (L2-1). Accordingly, in the unfolded mode, the tension bar (ETB) and the connecting bar (CTB) may be maintained in a spaced-apart state. In the unfolded mode, the distance between the tension bar (ETB) and the connecting bar (CTB) may be defined as the second distance (D2). The first distance (D1) and the second distance (D2) may be substantially equal. As the distance between the tension bars (ETB) and the connecting bars (CTB) is maintained, the elastic body (SMD) may be maintained in a compressed state.

[0209] FIGS. 13a to 13e are drawings for explaining a display device (DD') according to a comparative example.

[0210] 13a is a cross-sectional view showing a state before wrinkles occur in the display device (DD') in the insertion mode, and FIG. 13b is a cross-sectional view showing a state in which wrinkles occur in the display device (DD') in the unfolding mode. FIG. 13c is a drawing for explaining the results of measurements of the second area (AA2) shown in FIG. 13b using observation equipment. FIG. 13d is a cross-sectional view showing a state in which a defect occurs in the display device (DD') in the insertion mode. FIG. 13e is an image of a deformed portion in the third area (AA3) shown in FIG. 13d.

[0211] Referring to the drawings described above, among the components illustrated in FIGS. 13a to 13e, descriptions of components identical to the described components will be omitted or simplified.

[0212] Referring to FIGS. 13A to 13E, the display device (DD') may include a bent section (BA) around the roller (ROL), as illustrated in FIG. 13A. Stress may be applied to the joint (JPT) and the display module (DM) arranged on the outer surface of the roller (ROL) in the bent section (BA). When the expansion module (EMD, see FIG. 3) is repeatedly changed from the unfolded mode to the inserted mode or from the inserted mode to the unfolded mode, stress may be repeatedly applied to the joint (JPT) and the display module (DM) arranged on the outer surface of the roller (ROL).

[0213] Accordingly, fatigue failure may occur in the joint portion (JPT) of the marking assembly (PCR) and the marking module (DM) positioned on the outer surface of the roller (ROL). Fatigue failure refers to plastic deformation of a material when a stress lower than the fracture stress is repeatedly applied to the material. Plastic deformation refers to permanent deformation of the material without returning to its original shape even when the external force is removed.

[0214] As fatigue failure occurs, the joint (JPT) and the display module (DM) disposed on the outer surface of the roller (ROL) may be plastically deformed. The length of the joint (JPT) and the length of the display module (DM) may increase.

[0215] As illustrated in Fig. 13b, in the unfolding mode, the deformed portion (DFA) of the display module (DM) and the joint (JPT) can be moved to the upper portion of the moving plate (MVP).

[0216] The increased length portion (DFA) of the display module (DM) and the joint portion (JPT) may cause a wrinkle on the front surface of the display device (DD'). As illustrated in FIG. 13c, an 'M'-shaped wrinkle may occur in the deformed portion (DFA) of the display module (DM) and the joint portion (JPT). The deformed portion (DFA) of the display module (DM) may protrude upwards relative to the peripheral portion (NDF). For example, as illustrated in FIG. 13c, the height of the deformed portion (DFA) may be 890 μm higher than the height of the peripheral portion (NDF).

[0217] Wrinkles generated by the display module (DM) and the joint (JPT) may be exposed to the outside from the case (CS) of Fig. 3. When the wrinkles generated by the display module (DM) and the joint (JPT) are exposed to the outside, the wrinkles generated by the display module (DM) and the joint (JPT) are visible to the user, and thus, the surface quality of the display device (DD') may be reduced.

[0218] As illustrated in FIG. 13d, in the insertion mode, the deformed portion (DFA) of the display module (DM) and the joint portion (JPT) may move below the moving plate (MVP). Under the moving plate (MVP), wrinkles may occur in the portion of the joint portion (JPT) and the portion of the display module (DM). Accordingly, when the display device (DD) is in the insertion mode, the portion of the deformed support bars (SSB), the portion of the joint portion (JPT), and the portion of the display module (DM) may interfere with the expansion module (EMD, see FIG. 3) or the case (CS, see FIG. 3), which may cause a defect in the display device (DD').

[0219] Wrinkles that occur in the joint (JPT) and the display module (DM) can take various forms. Wrinkles can occur in both the joint (JPT) and the display module (DM), or in only one of them, and can also occur on both the top and bottom of the moving plate (MVP). As shown in the image in Fig. 13e, wrinkles can occur over a wide area in the joint (JPT), which can cause buckling of the support bars (SSB) attached to the joint (JPT).

[0220] FIGS. 14A to 14E are drawings for explaining a wrinkle improvement mechanism according to an embodiment of the present invention.

[0221] For example, FIGS. 14a and 14b are cross-sectional views of a display device (DD) in an unfolded mode, and FIGS. 14c and 14d are cross-sectional views of a display device (DD) in an inserted mode.

[0222] For example, FIG. 14e is a photographed image of a portion corresponding to the fourth area (AA4) illustrated in FIG. 14d.

[0223] Among the components illustrated in FIGS. 14a to 14e, reference will be made to the drawings described above, and descriptions of components identical to the described components will be omitted or simplified.

[0224] As described with reference to FIG. 13a, the display device (DD) may repeatedly operate between the insertion mode and the unfolding mode, causing wrinkles to occur in a portion of the display assembly (PCR), as illustrated in FIG. 14a.

[0225] As described in FIGS. 11b and 12b, the elastic force generated in the first state elastic body (SMD) and the tension generated in the display assembly (PCR) are installed in the connecting portion (CPP) so as to be in balance. However, as illustrated in FIG. 14a, when a wrinkle occurs in a part of the display assembly (PCR), the balance between the elastic force and the tension is broken.

[0226] As illustrated in Fig. 14b, the elastic body (SMD) in the first state changes to the third state. As the elastic force decreases, the length of the elastic body (SMD) increases and the connecting rod (CTB) moves toward the tension rod (ETB). The distance between the connecting rod (CTB) and the tension rod (ETB) can be reduced to a second-first distance (D2-1). As the elastic force decreases, the tension generated in the display assembly (PCR) also decreases. The reduced elastic force and the reduced tension can reach an equilibrium. In one embodiment of the present invention, the connecting rod (CTB) and the tension rod (ETB) are in contact, and at this time, the second-first distance (D2-1) can be 0.

[0227] When the connecting bar (CTB) moves in the first direction (DR1) toward the tension bar (ETB), the connecting support bar (COB) connected to the connecting bar (CTB), the connecting portion (JPT) connected to the connecting support bar (COB), and the display module (DM) connected to the connecting portion (JPT) can move in the first direction (DR1). Accordingly, wrinkles generated in the connecting portion (JPT) and the display module (DM) can be spread out flat, and buckling of the support bars (SSB) attached to the connecting portion (JPT) where wrinkles have occurred can be eliminated or reduced, as illustrated in FIG. 14e. Accordingly, the surface quality of the display device (DD) can be improved.

[0228] The principle of wrinkle removal in unfolding mode is explained with reference to FIGS. 14a and 14b, and this can be equally applied to FIGS. 14c and 14d.

[0229] FIG. 15a and FIG. 15b are drawings showing the height of the wrinkles of the display module (DM) according to the elastic modulus of the elastic body shown in FIG. 14a.

[0230] For example, FIGS. 15a and 15b are graphs showing the deformation of the front surface (DA, see FIG. 2b) of the display module (DM) spread by the elastic body (SMD) of FIGS. 14a and 14b, measured through observation equipment.

[0231] Referring to FIGS. 13c, 14b, 15a, and 15b, the x-axis of the graphs of FIGS. 15a and 15b may be defined as the position of the display module (DM) placed on the moving plate (MVP). The y-axis of the graphs of FIGS. 15a and 15b may be defined as the amount of deformation of the display module (DM).

[0232] The first graph (G1) illustrated in Fig. 15a is the result of measuring the front surface (DA, see Fig. 2b) of the display module (DM) unfolded by an elastic body (SMD) having an elastic modulus of 500 gf. The second graph (G2) illustrated in Fig. 15b is the result of measuring the front surface (DA, see Fig. 2b) of the display module (DM) unfolded by an elastic body (SMD) having an elastic modulus of 1800 gf.

[0233] As illustrated in Fig. 13c, when the deformation of the display module (DM) is 890 μm, the elastic body (SMD) can be relaxed. As the elastic body (SMD) is relaxed, the deformation of the display module (DM) can be reduced.

[0234] The higher the elastic modulus of the elastic body (SMD), the greater the elastic force of the elastic body (SMD). Specifically, in the graph of Fig. 15a, when the elastic modulus of the elastic body (SMD) is 500 gf, the deformation of the display module (DM) can be reduced to 500 μm. In the graph of Fig. 15b, when the elastic modulus of the elastic body (SMD) is 1800 mf, the deformation of the display module (DM) can be 250 μm.

[0235] As the elastic modulus of the elastomer (SMD) increases, the deformation of the display module (DM) decreases, and the surface quality of the display device (DD, see Fig. 1) can be improved.

[0236] FIGS. 16A to 16E are cross-sectional views of a display device (DD) according to one embodiment of the present invention.

[0237] For example, FIG. 16a is a cross-sectional view of a display device (DD) in insertion mode, and FIGS. 16b, 16d, and 16e are cross-sectional views of a display device (DD) in unfolding mode.

[0238] Among the components illustrated in FIGS. 16a to 16e, reference will be made to the drawings described above, and descriptions of components identical to the described components will be omitted or simplified.

[0239] Referring to Fig. 16a, when the display device (DD) is in insertion mode, the connecting rod (CTB) and the tension rod (ETB) can be in contact with each other. The elastic body (SMD) disposed between the head portion (FSP) and the penetration plate (CPL) can be in a third state.

[0240] When the elastic body (SMD) is in the third state, the elastic force applied to the connecting rod (CTB) by the elastic body (SMD) may be reduced, or the elastic force may not be applied to the connecting rod (CTB). The elastic force may not act on the connecting support bar (COB) connected to the connecting rod (CTB), the joint portion (JPT) connected to the connecting support bar (COB), and the display module (DM) connected to the joint portion (JPT). Accordingly, damage to the display module (DM) due to the elastic force can be prevented.

[0241] In the insertion mode of the display device (DD), the shortest distance from the fixed plate (SPL) to the coupling support bar (COB) can be defined as the second-first length (L2-1). The longest distance from the fixed plate (SPL) to the tension bar (ETB) can be defined as the fourth-first length (L4-1).

[0242] Referring to FIGS. 16a, 16b, and 16c, when the display device (DD) changes from the insertion mode to the unfolding mode, the movement distance of the coupling support bar (COB) and the movement distance of the connecting bar (CTB) may be greater than the movement distance of the moving plate (MVP).

[0243] The movement distance of the coupling support bar (COB) to the movement distance of the moving plate (MVP) may be 1:2. The movement distance of the connecting bar (CTB) connected to the moving plate (MVP) and the coupling support bar (COB) may be 1:2. The ratios of the movement distance of the coupling support bar (COB) to the movement distance of the moving plate (MVP) and the movement distance of the connecting bar (CTB) are omitted as they are described in FIGS. 12a to 12c.

[0244] As illustrated in FIG. 16c, when the display device (DD) is in the unfolded state, the distances from the first and third pin protrusions (FPT1, FPT3) to one side of the main plate (MPL) and the distances from the second and fourth pin protrusions (FPT2', FPT4') to one side of the main plate (MPL) may be different from each other. The distance from the second and fourth pin protrusions (FPT2', FPT4') to one side of the main plate (MPL) to the distance from the first and third pin protrusions (FPT1, FPT3) to one side of the main plate (MPL) may be 1:1.9. The movement distance of the moving plate (MVP) connected to the first and third pin protrusions (FPT1, FPT3) and the movement distance of the tension bar (ETB) connected to the second and fourth pin protrusions (FPT2', FPT4') may be 1:1.9.

[0245] The travel distance of the connecting bar (CTB) and the travel distance of the tension bar (ETB) may be different. The travel distance of the connecting bar (CTB) may be greater than the travel distance of the tension bar (ETB). For example, the travel distance of the tension bar (ETB) may be 2:1.9 to the travel distance of the connecting bar (CTB).

[0246] In the unfolding mode of the display device (DD), the shortest distance from the fixed plate (SPL) to the coupling support bar (COB) can be defined as the second-second length (L2-2). The longest distance from the fixed plate (SPL) to the tension bar (ETB) can be defined as the fourth-second length (L4-2).

[0247] The value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2) may be greater than the value obtained by subtracting the fourth-first length (L4-1) from the fourth-second length (L4-2). The value obtained by subtracting the fourth-first length (L4-1) from the fourth-second length (L4-2) to the value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2) may be 2:1.9.

[0248] As the movement distance of the connecting rod (CTB) is greater than the movement distance of the tension rod (ETB), the connecting rod (CTB) and the tension rod (ETB) can be spaced apart from each other in the first direction (DR1). In the unfolded state of the display device (DD), the distance between the connecting rod (CTB) and the tension rod (ETB) can be defined as a third distance (D3).

[0249] As the connecting rod (CTB) and the tension rod (ETB) are spaced apart from each other, the elastic body (SMD) disposed between the head portion (FSP) and the penetration plate (CPL) can change from the third state to the first state. The change in length of the elastic body (SMD) can be equal to the difference between the moving distance of the connecting rod (CTB) and the moving distance of the tension rod (ETB). The change in length of the elastic body (SMD) can be equal to the third distance (D3).

[0250] Referring to FIGS. 16d and 16e, in the unfolded state, when wrinkles occur in the joint (JPT) and the display module (DM), the elastic body (SMD) in the first state can relax and enter the third state. The principle of wrinkle removal in the unfolded mode was explained with reference to FIGS. 14a and 14b, and this can be equally applied to FIGS. 16c and 16d.

[0251] FIGS. 17a and 17b are drawings for explaining a connection part according to one embodiment.

[0252] For example, FIG. 17a is a perspective view of a connecting portion (CPPa), and FIG. 17b is an exploded perspective view of the connecting portion (CPPa) illustrated in FIG. 17a.

[0253] Referring to the drawings described above, among the components illustrated in FIGS. 17a and 17b, descriptions of components identical to the described components will be omitted or simplified.

[0254] Referring to FIGS. 17A and 17B, the connecting portion (CPPa) may include a tension bar (ETBa), a connecting bar (CTBa), elastic members (SMD), and fixing pins (CPN). The tension bar (ETBa) may extend in a second direction (DR2). For example, when viewed in the second direction (DR2), the side surface of the tension bar (ETBa) may have a shape similar to a 'T' rotated 90 degrees.

[0255] The tension bar (ETBa) may include a bonding plate (EPL) and an insertion plate (ESWb). The bonding plate (EPL) has a plane defined by a first direction (DR1) and a second direction (DR2), and may extend longer in the second direction (DR2) than in the first direction (DR1).

[0256] A plurality of first guide grooves (GDR1) may be formed in the joining plate (EPL). The first guide grooves (GDR1) may be formed adjacent to one side of the opposite sides of the joining plate (EPL) in the first direction (DR1). The other side of the opposite sides of the joining plate (EPL) in the first direction (DR1) may be defined as the side facing the connecting bar (CTBa).

[0257] Each of the first guide grooves (GDR1) can extend in the second direction (DR2). The first guide grooves (GDR1) can be arranged in the second direction (DR2). By way of example, two first guide grooves (GDR1) are illustrated, but the number of first guide grooves (GDR1) is not limited thereto.

[0258] The insertion plate (ESWb) may be positioned on the other side of the mating plate (EPL) that opposes each other in the first direction (DR1). In practice, the mating plate (EPL) and the insertion plate (ESWb) may be formed integrally.

[0259] The insertion plate (ESWb) may extend in the second direction (DR2). The length of the insertion plate (ESWb) in the third direction (DR3) may be longer than the length of the coupling plate (EPL) in the third direction (DR3). When viewed from the second direction (DR2), the upper and lower surfaces of the insertion plate (ESWb), which are opposed to each other in the third direction (DR3), may protrude further than the upper and lower surfaces of the coupling plate (EPL), respectively.

[0260] A plurality of first grooves (MPL1) and a plurality of second openings (CGR) may be formed on an upper surface of an insert plate (ESWb). When viewed in a first direction (DR1), the first grooves (MPL1) may be arranged in a second direction (DR2). The second openings (CGR) may be arranged in the second direction (DR2). The first grooves (MPL1) and the second openings (CGR) may be arranged alternately in the second direction (DR2). The second openings (CGR) may be defined between the first grooves (MPL1) that are adjacent to each other in the second direction (DR2).

[0261] The first grooves (MPL1) may extend from the upper surface of the insert plate (ESWb) toward the lower surface. For example, the first grooves (MPL1) may have a shape corresponding to a square.

[0262] The second openings (CGR) may extend from the upper surface of the insert plate (ESWb) toward the lower surface. The bottom surface of the insert plate (ESWb) defining the second openings (CGR) may have a concave shape.

[0263] For example, the spacing between the second openings (CGR) adjacent to each other in the second direction (DR2) may be constant. However, the spacing between the second openings (CGR) adjacent to each other in the second direction (DR2) may not be constant.

[0264] The connecting bar (CTBa) and the tension bar (ETBa) may be arranged in a first direction (DR1). The connecting bar (CTBa) may be arranged adjacent to one side of the opposite sides of the insert plate (ESWb) in the first direction (DR1). The connecting bar (CTBa) may extend in a second direction (DR2). For example, when viewed in the second direction (DR2), the connecting bar (CTBa) may have a shape of a 'T' rotated 90 degrees. The other side of the opposite sides of the insert plate (ESWb) in the first direction (DR1) may be defined as a side facing the joining plate (EPL).

[0265] The connecting bar (CTBa) may include a connecting plate (CSWa) and a penetrating plate (CPLb). The connecting plate (CSWa) may have a plane defined by a first direction (DR1) and a second direction (DR2), and may extend longer in the second direction (DR2) than in the first direction (DR1).

[0266] The through plate (CPLb) may be arranged on one side of the opposite sides of the connecting plate (CSWa) in the first direction (DR1). In practice, the connecting plate (CSWa) and the through plate (CPLb) may be formed integrally. One side of the opposite sides of the connecting plate (CSWa) in the first direction (DR1) may be defined as the side facing the tension bar (ETBa).

[0267] A plurality of second grooves (MPL2) may be defined on the upper surface of the through plate (CPLb). The second grooves (MPL2) may extend in a third direction (DR3) from the upper surface of the through plate (CPLb) toward the lower surface. The second grooves (MPL2) may have a shape corresponding to a square.

[0268] The second grooves (MPL2) may be arranged in the second direction (DR2). The second grooves (MPL2) may be arranged to correspond to the first grooves (MPL1). Although not illustrated, when the moving plate (MVP, see FIG. 11a) is coupled with the connecting portion (CPPa), the branches (BRP) of the moving plate (MVP, see FIG. 11a) may be arranged in the first grooves (MPL1) and the second grooves (MPL2).

[0269] The elastic bodies (SMD) may be arranged adjacent to one side of the bonding plate (EPL). The elastic bodies (SMD) may be arranged in the second direction (DR2). For example, the spacing between the elastic bodies (SMD) adjacent to each other in the second direction (DR2) may be uniform.

[0270] The fixing pins (CPN) can penetrate the elastomers (SMD) and the tension rod (ETBa). The fixing pins (CPN) can be coupled to the connecting rod (CTBa) through the second openings (CGR). The fixing pins (CPN) compress the elastomers (SMD) and can be coupled to the connecting rod (CTBa).

[0271] Figures 18a to 18c are drawings for explaining the operation of the connection part illustrated in Figure 17a.

[0272] For example, FIG. 18a is a cross-sectional view showing the structure in insertion mode, and FIGS. 18b and 18c are cross-sectional views showing the structure in unfolding mode.

[0273] For example, in FIGS. 18a to 18c, only the left side of the fixed plate (SPL) is illustrated, but the corresponding part on the right side of the fixed plate (SPL) may also have substantially the same configuration.

[0274] Among the components illustrated in FIGS. 18a to 18c, reference will be made to the drawings described above, and descriptions of components identical to the described components will be omitted or simplified.

[0275] Referring to FIG. 18a, the connecting portion (CPPa) can be connected to the display assembly (PCR). The coupling support bar (COB) of the support plate (SPT) can be connected to the connecting rod (CTBa).

[0276] When the display device (DD) is in the insertion mode, the fixing pin (CPN) penetrating the elastic body (SMD) and the tensile bar (ETBa) compresses the elastic body (SMD) and can be coupled to the connecting bar (CTBa). At this time, an elastic force is generated in the elastic body (SMD) to recover from the first state to the third state. An elastic force can be provided to the connecting support bar (COB) connected to the connecting bar (CTBa). Accordingly, a tension force can be generated in the connecting portion (JPT) connected to the connecting support bar (COB) and the display module (DM) connected to the connecting portion (JPT). The elasticity and tension can be in equilibrium. In the insertion state of the display device (DD), the distance between the connecting bar (CTBa) and the tensile bar (ETBa) can be defined as a fourth distance (D4).

[0277] Referring to FIGS. 18a and 18b, when the display device (DD) changes from the insertion mode to the unfolding mode, the tension bar (ETBa), the moving plate (MVP), the display assembly (PCR) connected to the moving plate (MVP), and the connecting bar (CTBa) connected to the display assembly (PCR) can be moved.

[0278] The moving plate (MVP) and the display assembly (PCR) may have different travel distances. The ratio of the travel distance of the moving plate (MVP) to the travel distance of the connecting rod (CTBa) connected to the coupling support bar (COB) may be 2:1. A description of the travel distance of the moving plate (MVP) relative to the travel distance of the connecting rod (CTBa) will be omitted as it has been described above in FIGS. 12A and 12B.

[0279] The movement distance of the tension bar (ETBa) and the movement distance of the connecting bar (CTBa) may be the same. The movement distance of the tension bar (ETB) and the movement distance of the connecting bar (CTB) described in FIGS. 11b and 12b may be equally applied to the movement distance of the tension bar (ETBa) and the movement distance of the connecting bar (CTBa) of FIGS. 18a and 18b. In the unfolding mode of the display device (DD), the distance between the tension bar (ETBa) and the connecting bar (CTBa) may be defined as a fifth distance (D5).

[0280] The fourth distance (D4) and the fifth distance (D5) may be substantially the same. Since the fourth distance (D4) in the insertion mode and the fifth distance (D5) in the unfolding mode are the same, the elastic body (SMD) arranged between the tensile bar (ETBa) and the head portion (FSP) may be in the first state. The elastic body (SMD) may maintain a compressed state in the insertion mode or the unfolding mode.

[0281] Referring to FIGS. 18b and 18c, when wrinkles occur in the display module (DM) and the joint portion (JPT), the tension of the display module (DM) and the joint portion (JPT) may be reduced. The tension applied to the joint support bar (COB) connected to the joint portion (JPT) may be reduced. Accordingly, the balance between elasticity and tension may be broken. As illustrated in FIG. 18c, the elastic body (SMD) may enter a third state.

[0282] When the elastic body (SMD) is in the third state, the elastic body (SMD) can apply an elastic force to the connecting rod (CTBa) in a direction parallel to the first direction (DR1). The connecting rod (CTBa) can move in the first direction (DR1) toward the tensile rod (ETB). The distance between the connecting rod (CTBa) and the tensile rod (ETBa) can be reduced. For example, when the distance between the connecting rod (CTBa) and the tensile rod (ETBa) is reduced, the connecting rod (CTBa) and the tensile rod (ETBa) can come into contact with each other.

[0283] When the connecting bar (CTBa) moves in the first direction (DR1) toward the tension bar (ETBa), the connecting support bar (COB) connected to the connecting bar (CTB), the connecting portion (JPT) connected to the connecting support bar (COB), and the display module (DM) connected to the connecting portion (JPT) can move in the first direction (DR1). Accordingly, wrinkles generated in the display module (DM) and the connecting portion (JPT) can be spread out flat. Accordingly, the surface quality of the display device (DDa) can be improved.

[0284] FIGS. 19A to 19C are drawings for explaining a display device according to one embodiment of the present invention.

[0285] For example, FIG. 19a is a cross-sectional view of a display device (DDa) in insertion mode, and FIGS. 19b and 19c are cross-sectional views of a display device (DDa) in unfolding mode.

[0286] For convenience of explanation, the display device (DDa) illustrated in FIGS. 19a to 19c will be described mainly with respect to the differences from the display device (DDa) illustrated in FIGS. 18a to 18c.

[0287] Referring to Fig. 19a, when the display device (DDa) is in a contracted state, the tension rod (ETBa) and the connecting rod (CTBa) may be in contact with each other. The elastic body (SMD) positioned between the head portion (FSP) and the tension rod (ETBa) may be in a relaxed state. For example, the elastic body (SMD) may be in a third state.

[0288] When the elastic body (SMD) is in a normal state, the elastic body (SMD) may not exert an elastic force on the connecting rod (CTBa). The elastic force may not act on the connecting support bar (COB) connected to the connecting rod (CTBa), the connecting portion (JPT) connected to the connecting support bar (COB), and the display module (DM) connected to the connecting portion (JPT). Accordingly, damage to the display module (DM) due to the elastic force can be prevented.

[0289] Referring to FIGS. 19a and 19b, when the display device (DDa) changes from a contracted state to an expanded state, the movement distance of the connecting rod (CTBa) and the movement distance of the tension rod (ETBa) may be different from each other.

[0290] The difference in the movement distance of the tension bar (ETB) and the movement distance of the connecting bar (CTB) described in FIGS. 16a and 16b can be equally applied to FIGS. 19a and 19b. The value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2) can be greater than the value obtained by subtracting the fourth-third length (L4-3) from the fourth-fourth length (L4-4). For example, the value obtained by subtracting the fourth-third length (L4-3) from the fourth-fourth length (L4-4) to the value obtained by subtracting the second-first length (L2-1) from the second-second length (L2-2) can be 2:1.9.

[0291] As the movement distance of the connecting bar (CTBa) is greater than the movement distance of the tensile bar (ETBa), the connecting bar (CTBa) and the tensile bar (ETBa) can be spaced apart from each other in the first direction (DR1). In the unfolded state of the display device (DDa), the distance between the connecting bar (CTBa) and the tensile bar (ETBa) can be defined as a sixth distance (D6).

[0292] Accordingly, the elastic body (SMD) positioned between the head portion (FSP) and the tension bar (ETBa) can be compressed. The change in length of the elastic body (SMD) can be equal to the difference between the movement distance of the connecting bar (CTBa) and the movement distance of the tension bar (ETBa). The change in length of the elastic body (SMD) can be equal to the sixth distance (D6).

[0293] Referring to FIGS. 19b and 19c, in the expanded state, when wrinkles occur in the display module (DM) and the joint portion (JPT), the elastic body (SMD) can enter a third state. As the elastic body (SMD) enters the third state, the connecting rod (CTBa) can move toward the tension rod (ETBa). When the connecting rod (CTBa) moves toward the tension rod (ETBa), the connecting support bar (COB) connected to the connecting rod (CTBa), the joint portion (JPT) connected to the joint support bar (COB), and the display module (DM) connected to the joint portion (JPT) can move in the first direction (DR1). Accordingly, the wrinkles occurring in the display module (DM) and the joint portion (JPT) can be removed.

[0294] FIGS. 20A and 20B are drawings for explaining a driving unit according to one embodiment of the present invention.

[0295] For example, Fig. 20a is a perspective view and Fig. 20b is a plan view.

[0296] For convenience of explanation, a portion of the tensile bar (ETB) and a portion of the moving plate (MVP) are shown in Fig. 20a.

[0297] Referring to the drawings described above, among the components illustrated in FIGS. 20a and 20b, descriptions of components identical to the described components will be omitted or simplified.

[0298] Referring to FIG. 20a, the driving unit (DUa) may include a motor unit (MTP) that generates rotational force, a first screw (SCW1) coupled to a tension bar (ETB), a second screw (SCW2) coupled to a moving plate (MVP), and a gear assembly (GEA) that transmits rotational force from the motor unit (MTP) to the first and second screws (SCW1, SCW2).

[0299] The motor unit (MTP) may include a motor (MT) and a shaft (SFT) extending from the motor (MT) in a second direction (DR2). The motor (MT) may generate a rotational force. The shaft (SFT) extending from the motor (MT) may be rotated about a rotational axis parallel to the second direction (DR2) by the rotational force.

[0300] The tension bar (ETB) may further include a first guide portion (FP1). The first guide portion (FP1) may be disposed on the upper surface of the coupling plate (EPL). A first screw (SCW1) may be coupled to the tension bar (ETB). The first screw (SCW1) may be coupled to the first guide portion (FP1) of the tension bar (ETB). The first screw (SCW1) may be inserted into a first guide opening (FOP1) defined in the first guide portion (FP1).

[0301] A first groove (GV1) may be defined on an outer surface of the first screw (SCW1). The first groove (GV1) may extend in a first direction (DR1) while surrounding the outer surface of the first screw (SCW1). Although not shown, the first guide portion (FP1) may further include a plurality of protrusions on an inner surface defining a first guide opening (FOP1), and the protrusions may be inserted corresponding to the first groove (GV1). Accordingly, when the first screw (SCW1) rotates around a rotational axis parallel to the first direction (DR1), the first guide portion (FP1) may be moved in the first direction (DR1) by the protrusions.

[0302] The moving plate (MVP) may further include a second guide portion (FP2). The second guide portion (FP2) may be disposed on the lower surface of the stem portion (STP). The second screw (SCW2) may be coupled to the moving plate (MVP). The second screw (SCW2) may be coupled to the second guide portion (FP2) of the moving plate (MVP). The second screw (SCW2) may be inserted into a second guide opening (FOP2) defined in the second guide portion (FP2).

[0303] A second groove (GV2) may be defined on an outer surface of the second screw (SCW2). The second groove (GV2) may extend in a first direction (DR1) while surrounding the outer surface of the second screw (SCW2). Although not shown, the second guide portion (FP2) may further include a plurality of protrusions on an inner surface defining a second guide opening (FOP2), and the protrusions may be inserted corresponding to the second groove (GV2). Accordingly, when the second screw (SCW2) rotates around a rotational axis parallel to the first direction (DR1), the second guide portion (FP2) may be moved in the first direction (DR1) by the protrusions.

[0304] The gear assembly (GEA) can transmit rotational power from the motor unit (MTP) to the first screw (SCW1) and the second screw (SCW2). The gear assembly (GEA) can include a first vertical gear (VGR1), a second vertical gear (VGR2), a first gear (GR1), and a second gear (GR2).

[0305] The first vertical gear (VGR1) can be connected to one end of the shaft (SFT). When the shaft (SFT) rotates around a rotational axis parallel to the second direction (DR2), the first vertical gear (VGR1) can rotate in the same direction as the shaft (SFT).

[0306] The second vertical gear (VGR2) may be connected to one end of the first screw (SCW1). The second vertical gear (VGR2) may mesh with the first vertical gear (VGR1). When the first vertical gear (VGR1) rotates, the second vertical gear (VGR2) may rotate around a rotational axis parallel to the first direction (DR1).

[0307] When the second vertical gear (VGR2) rotates, the first screw (SCW1) can rotate around a rotation axis parallel to the first direction (DR1). When the first screw (SCW1) rotates, the first guide portion (FP1) can reciprocate in the first direction (DR1) along the first screw (SCW1). Accordingly, the tension bar (ETB) can reciprocate in the first direction (DR1).

[0308] The first gear (GR1) can be coupled to the first screw (SCW1). The first gear (GR1) can be positioned between the second vertical gear (VGR2) and the first guide portion (FP1). When the first screw (SCW1) rotates, the first gear (GR1) can rotate in the same direction as the first screw (SCW1).

[0309] The second gear (GR2) can be coupled to the second screw (SCW2). The second gear (GR2) can be coupled to one end of the second screw (SCW2). The second gear (GR2) can mesh with the first gear (GR1). When the first gear (GR1) rotates, the second gear (GR2) can rotate around a rotational axis parallel to the first direction (DR1). When rotating with the second gear (GR2), the second screw (SCW2) can rotate around a rotational axis parallel to the first direction (DR1). When the second screw (SCW2) rotates, the second guide portion (FP2) can move in the first direction (DR1) along the second groove (GV2) defined on the outer surface of the second screw (SCW2). Accordingly, the moving plate (MVP) can move in the first direction (DR1).

[0310] When a rotational force is generated from the motor (MT), the tension rod (ETB) and the moving plate (MVP) can move in the first direction (DR1). The movement distance of the tension rod (ETB) and the movement distance of the moving plate (MVP) may be different from each other.

[0311] Specifically, the pitch of the first groove (GV1) defined in the first screw (SCW1) and the pitch of the second groove (GV2) defined in the second screw (SCW2) may be different from each other. The pitch of the first groove (GV1) may be greater than the pitch of the second groove (GV2). When the first screw (SCW1) and the second screw (SCW2) rotate at the same number of times, the movement distance of the first guide part (FP1) may be greater than the movement distance of the second guide part (FP2). Accordingly, the ratio of the movement distance of the tension bar (ETB) connected to the first guide part (FP1) to the movement distance of the moving plate (MVP) connected to the second guide part (FP2) may be 1:1.9.

[0312] FIGS. 21A and 21B are drawings for explaining a driving unit according to one embodiment of the present invention.

[0313] For example, Fig. 21a is a perspective view and Fig. 21b is a plan view.

[0314] For convenience of explanation, a portion of the tensile bar (ETB) and a portion of the moving plate (MVP) are shown in Fig. 21a.

[0315] Referring to the drawings described above, among the components illustrated in FIGS. 21a and 21b, descriptions of components identical to the described components will be omitted or simplified.

[0316] Referring to FIGS. 21a and 21b, the pitch of the first groove (GV1) defined on the outer surface of the first screw (SCW1) and the pitch of the second groove (GV2a) defined on the outer surface of the second screw (SCW2a) may be the same.

[0317] The radius of the first gear (GR1) may be smaller than the radius of the second gear (GR2a). The circumference of the first gear (GR1) may be smaller than the circumference of the second gear (GR2a). Accordingly, the number of teeth of the second gear (GR2a) may be larger than the number of teeth of the first gear (GR1).

[0318] When the motor (MT) is operating, the rotational amount of the second gear (GR2a) meshed with the first gear (GR1) may be less than the rotational amount of the first gear (GR1). For example, the rotational amount of the second gear (GR2a) to the rotational amount of the first gear (GR1) may be 1.9:1.

[0319] Accordingly, the travel distance of the tension bar (ETB) connected to the first gear (GR1) via the first screw (SCW1) and the travel distance of the moving plate (MVP) connected to the second gear (GR2a) via the second screw (SCW2) may be different. The travel distance of the tension bar (ETB) may be greater than the travel distance of the moving plate (MVP). For example, the travel distance of the moving plate (MVP) to the travel distance of the tension bar (ETB) may be 1.9:1.

[0320] Although the present invention has been described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Furthermore, the embodiments disclosed in the present invention are not intended to limit the technical idea of ​​the present invention, and all technical ideas falling within the scope of the following claims and equivalents thereof should be construed as being included within the scope of the rights of the present invention.

[0321] The present invention has high industrial applicability because a display device capable of improving the surface quality of a display module can be provided to a user.

Claims

1. A display assembly including a first region defined by a first direction and a second direction intersecting the first direction, and a second region extending from the first region and positioned below the first region in an inserted state, and at least a portion of which provides the same plane as the first region in an unfolded state; and Including an expansion module positioned below the first region, The above expansion module, A first portion coupled to one end of the second region and extending in the second direction; A second part disposed on one side of the first part within the first direction and extending in the second direction; A fixed pin including a body portion extending in the first direction and penetrating at least one of the first portion or the second portion, and a head portion disposed at one end of the body portion; and Including an elastic body disposed between the first part or the second part through which the body part penetrates and the head part, A display device in which, when the display assembly changes from the inserted state to the unfolded state, the movement distance of the first part and the movement distance of the second part are substantially the same.

2. In paragraph 1, The state in which the elastic body is compressed is defined as the first state, and the state in which the elastic body is more relaxed than the first state is defined as the second state. A display device in which the elastic body is in the first state when the display assembly is in the inserted state or the unfolded state.

3. In paragraph 2, When the above display assembly is in the inserted state, a first distance is defined between the first part and the second part, A display device wherein, when the display assembly is in the unfolded state, a second distance is defined between the first part and the second part, and the first distance and the second distance are substantially the same.

4. In paragraph 3, The above expansion module further includes a moving plate coupled to the display assembly, A display device in which the moving plate is disposed between the first region and the second region, and the movement distance of the second part is 1:2 with respect to the movement distance of the moving plate when the display assembly changes from the inserted state to the unfolded state.

5. In paragraph 4, A display device in which the body portion penetrates the first portion and is joined to the second portion, and the elastic body is disposed between the head portion and the other side of the first portion.

6. In paragraph 4, A display device in which the body portion is connected to the first portion by penetrating the second portion, the elastic body is disposed between the head portion and one side of the second portion, and the one side of the second portion is defined as a side disposed further from the one side of the first portion.

7. In paragraph 4, The above expansion module is a display device further including a driving unit coupled to the moving plate and the second part.

8. In paragraph 7, The above driving part, A motor that generates rotational force; A gear assembly transmitting the above rotational force; A first screw coupled to the second part and receiving the rotational force from the gear assembly; and A second screw coupled to the moving plate and receiving the rotational force from the gear assembly, The above gear assembly, A first vertical gear coupled to the above motor; A second vertical gear coupled to the first screw and meshing with the first vertical gear to rotate around a rotation axis parallel to the first direction; A first gear coupled to the first screw and rotating in the same direction as the second vertical gear; and A display device including a second gear coupled to the second screw and interlocked with the first vertical gear to rotate around a rotation axis parallel to the first direction.

9. In paragraph 8, An indicator device in which the number of teeth of the first gear is greater than the number of teeth of the second gear.

10. In paragraph 8, A display device in which the length of the first groove defined along the outer surface of the first screw is shorter than the length of the second groove defined along the outer surface of the second screw.

11. In paragraph 7, The above driving part, Main plate; A first arm coupled to the lower surface of the main plate and designed to unfold or fold in the first direction; and A display device comprising a second arm coupled to the lower surface of the main plate, symmetrical with respect to the first arm in the second direction, and designed to unfold or fold in the first direction.

12. A display assembly including a first region defined by a first direction and a second direction intersecting the first direction, and a second region extending from the first region and positioned below the first region in an inserted state, and at least a portion of which provides the same plane as the first region in an unfolded state; and Including an expansion module positioned below the first region, The above expansion module, A first portion coupled to one end of the second region and extending in the second direction; A second part disposed on one side of the first part within the first direction and extending in the second direction; A fixed pin including a body portion extending in the first direction and penetrating at least one of the first portion or the second portion and a head portion disposed at one end of the body portion; and Including an elastic body disposed between the first part or the second part that is penetrated through the first part or the second part and the head part, A display device in which, when the display assembly changes from the inserted state to the unfolded state, the movement distance of the first part is greater than the movement distance of the second part.

13. In paragraph 12, The state in which the elastic body is compressed is defined as the first state, and the state in which the elastic body is more relaxed than the first state is defined as the second state. A display device in which the elastic body is in the second state when the display assembly is in the inserted state, and the elastic body is in the first state when the display assembly is in the unfolded state.

14. In paragraph 13, When the above display assembly is in the inserted state, a first distance is defined between the first part and the second part, A display device in which a second distance is defined between the first portion and the second portion when the display assembly is in the unfolded state, and the second distance is greater than the first distance.

15. In paragraph 14, The above expansion module further includes a moving plate coupled to the display assembly, The above moving plate is placed between the first region and the second region, A display device in which the movement distance of the above moving plate is twice greater than the movement distance of the above second part.

16. In paragraph 15, A display device in which, when the display assembly changes from the inserted state to the unfolded state, the sum of the movement distance of the second part relative to the movement distance of the moving plate and the reduced length of the elastic body is 1:

2.

17. In paragraph 16, A display device in which the body portion penetrates the first portion and is joined to the second portion, and the elastic body is disposed between the head portion and the other side of the first portion.

18. In paragraph 16, A display device in which the body portion is connected to the first portion by penetrating the second portion, the elastic body is disposed between the head portion and one side of the second portion, and the one side of the second portion is defined as a side disposed further from the one side of the first portion.

19. In paragraph 15, The above expansion module further includes a driving unit coupled to the moving plate and the second part, The above driving part, A motor that generates rotational force; A gear assembly transmitting the above rotational force; A first screw coupled to the second part and receiving the rotational force from the gear assembly; and A second screw coupled to the moving plate and receiving the rotational force from the gear assembly, The above gear assembly, A first vertical gear coupled to the above motor; A second vertical gear coupled to the first screw and meshing with the first vertical gear to rotate around a rotation axis parallel to the first direction; A first gear coupled to the first screw and rotating in the same direction as the second vertical gear; and A display device including a second gear coupled to the second screw and interlocked with the first vertical gear to rotate around a rotation axis parallel to the first direction.

20. In paragraph 19, An indicator device in which the number of teeth of the first gear is greater than the number of teeth of the second gear.

21. In paragraph 19, A display device in which the length of the first groove defined along the outer surface of the first screw is shorter than the length of the second groove defined along the outer surface of the second screw.

22. In paragraph 15, The above expansion module further includes a driving unit coupled to the moving plate and the second part, The above driving part, Main plate; A first arm coupled to the lower surface of the main plate and designed to unfold or fold in the first direction; and A display device comprising a second arm coupled to the lower surface of the main plate, symmetrical with respect to the first arm in the second direction, and designed to unfold or fold in the first direction.

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