Foldable display device

Abstract

To solve various problems in a foldable display device.SOLUTION: The present disclosure relates to display device, specifically, relates to a foldable display device that can be folded and unfolded. According to the present disclosure, a bottom plate may include a first portion having a first height and a second portion having a second height. According to the present disclosure, the foldable display device including an up-down plate having a length in an axial direction is provided. According to the present disclosure, the foldable display device including roller assembly including rollers and roller stoppers is provided.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, to a foldable display device that can be folded or unfolded.

Background Art

[0002] Display devices are becoming increasingly smaller to meet consumers' purchasing desires. The miniaturization of display devices improves the design aspect and portability and can demonstrate the high technical capabilities of display devices, so many manufacturers are making efforts.

[0003] In particular, recently, so-called foldable display devices that can fold or, conversely, unfold a folded display device have been developed. Foldable display devices can be folded or unfolded based on a hinge device. Foldable display devices are applied to small display devices such as smartphones and are also applied to medium-sized display devices such as tablet PCs and notebook computers.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors recognized the requirements for the performance of the above-described foldable display device and the limitations in improving folding wrinkles.

[0005] Therefore, embodiments of the present disclosure relate to a foldable display device that substantially eliminates one or more problems resulting from the limitations and drawbacks of the related art. An object of the present disclosure is to provide a foldable display device including a hinge device.

[0006] An object of the present disclosure is to provide a fastening structure between a hinge and a peripheral configuration.

[0007] An object of the present disclosure is to provide a foldable display device in which folding lines are eliminated.

[0008] The present disclosure aims to provide a foldable display device that is strong in the infolded state.

[0009] The present disclosure aims to provide a foldable display device that can block heat generated in an integrated circuit from being transmitted to a panel.

[0010] The present disclosure aims to reduce the thickness of a display device.

[0011] Other features and aspects are shown in the description below, and will be partly clarified by the description or will become clear by implementing the inventive concept described herein. Other features and aspects of the inventive concept can be realized and achieved by the structures specifically pointed out in the description or those derivable therefrom, as well as by the claims and the accompanying drawings.

Means for Solving the Problems

[0012] To solve the problems of the present invention, according to the present disclosure, there is disclosed a foldable display device including a panel including a first display area, a second display area, and a folding area, and one or more plates disposed below the panel, an infolding hinge assembly disposed below the panel assembly in the folding area and including a hinge cover, and a first cover frame and a second cover frame coupled to the infolding hinge assembly, wherein the one or more plates include a bottom plate, and the bottom plate includes a first portion having a first height and a second portion having a second height lower than the first height.

Effects of the Invention

[0013] According to the present disclosure, an up-down rate that rises and falls by the folding and unfolding operations of a foldable display device is provided. When folding is repeated by the up-down rate, creases that may occur on the panel can be improved.

[0014] According to the present disclosure, in the unfolded state of a foldable display device, a roller assembly that presses a hinge device using rollers is provided. By the roller assembly, the unfolded state can be firmly maintained.

[0015] According to the present disclosure, a coupling structure of various configurations included in a hinge device is provided. By the coupling structure of various configurations, miniaturization and strength of the hinge device can be achieved.

[0016] According to the present disclosure, the bottom plate may include a first part and a second part. An integrated circuit is disposed below the second part, and a heat dissipation sheet is disposed on the second part. Thereby, heat generated by the integrated circuit can be blocked from being transmitted to the panel.

[0017] According to the present disclosure, the first part and the second part have different heights from each other. The heat dissipation sheet is disposed in the accommodation space formed by the different heights. Thereby, the heat dissipation sheet can be disposed without reducing the thickness of the display device. According to the present disclosure, a vertical wall is disposed on the second part. Although the rigidity may decrease due to the reduced height of the bottom plate, the vertical wall can compensate for the rigidity.

[0018] According to the present disclosure, the heat dissipation sheet includes a first adhesive surface and a second adhesive surface that surround a heat dissipating substance. When the heat dissipating substance is a graphite substance containing dust, foreign matter due to the dust can be prevented. According to the present disclosure, the second adhesive surface can contact a plurality of heat dissipating substances. Since the second adhesive surface is integrally formed, it is possible to compensate for a decrease in the heat dissipation function that may occur when the heat dissipating substance is divided into a plurality of parts.

[0019] In addition, various effects directly or indirectly derived by the present disclosure can be provided.

[0020] It should be understood that both the above general description and the following detailed description are exemplary and explanatory, and are intended to further explain the concept of the present invention described in the claims.

[0021] The drawings included to provide a further understanding of the present disclosure and attached as part of this application show embodiments of the present disclosure and explain various principles.

Brief Description of the Drawings

[0022]

Figure 1

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Figure 11

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Figure 17

Best Mode for Carrying Out the Invention

[0023] The advantages and features of the present disclosure, and the methods for achieving them, will become apparent by referring to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, and can be embodied in various different forms. Merely, these embodiments are provided to make the disclosure of the present disclosure complete, and are merely provided to fully show the scope of the invention to those having ordinary knowledge in the technical field to which the present disclosure pertains.

[0024] In the drawings for explaining the embodiments of the present disclosure, the shapes, sizes, ratios, angles, numbers, etc. disclosed are merely examples, and the present disclosure is not limited to the matters disclosed. The same reference numerals throughout the disclosure refer to the same components. Also, when explaining the present disclosure, if it is determined that a specific explanation of related known technologies will unnecessarily obscure the gist of the present disclosure, the detailed explanation thereof will be omitted. When terms such as "including", "having", "becoming", etc. mentioned in the present disclosure are used, other parts can be added unless "only" is used. When a component is expressed in the singular, it includes the case of including a plurality unless otherwise explicitly stated.

[0025] In the interpretation of components, it is interpreted to include an error range even without a separate explicit description. In the case of an explanation of a positional relationship, for example, when the positional relationship between two parts is explained by "on ~", "above ~", "below ~", "on the side of ~", etc., unless "immediately" or "directly" is used, one or more other parts can also be located between the two parts.

[0026] In the case of an explanation of a time relationship, for example, when the temporal front-back relationship is explained by "after ~", "subsequent to ~", "next ~", "before ~", etc., unless "immediately" or "directly" is used, the case of not being continuous can also be included.

[0027] The first, the second, etc. are used to describe various components, but these components are not limited by these terms. These terms are merely used to distinguish one component from another. Thus, the first component referred to below may be the second component within the technical concept of the present disclosure.

[0028] The respective features of each embodiment of the present disclosure can be partially or wholly combined or combined with each other, various interlocks and drives are technically possible, and each embodiment may be implemented independently of each other or may be implemented in relation to each other together.

[0029] Hereinafter, a display device according to the present disclosure will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing an unfolding state of a display device (10) according to various embodiments of the present disclosure. FIG. 2 is a diagram showing a folding state of the display device (10) according to various embodiments of the present disclosure.

[0030] Referring to FIG. 1, the front surface, the upper surface, the lower surface, the right surface, the left surface, and the back surface of the display device (10) in the unfolded state are shown. Referring to FIG. 2, the front surface, the upper surface, the lower surface, the right surface, the left surface, and the back surface of the display device (10) in the folded state are shown.

[0031] Referring to FIG. 1, the display device (10) includes a panel (PNL) including a first display area (DA1), a second display area (DA2), and a folding area (FA). The panel (PNL) is integrally formed and displays an image over the entire first display area (DA1), second display area (DA2), and folding area (FA).

[0032] The display device (10) includes an in-folding hinge assembly (IHA) that can rotate in an in-folding manner with respect to the folding axis (A1). The in-folding hinge assembly (IHA) may not be substantially observable on the front and rear surfaces of the display device (10) in the unfolded state. This is because the in-folding hinge assembly (IHA) is disposed at the rear portion of the display device (10) and covered by the cover frame (CF).

[0033] The in-folding hinge assembly (IHA) may have a shape that is formed long along the folding axis (A1). The in-folding hinge assembly (IHA) may be disposed within the folding region (FA). The folding region (FA) is the region where the panel (PNL) is folded by the in-folding hinge assembly (IHA). The first display region (DA1) and the second display region (DA2) are regions that are symmetric to each other with respect to the folding region (FA). The first display region (DA1) is the region located on one side with respect to the folding axis (A1), and the second display region (DA2) is the region located on the other side with respect to the folding axis (A1).

[0034] A top frame (TF) may be disposed on the front surface of the display device (10). The top frame (TF) may be disposed to cover the rim of the panel (PNL). The front surface of the display device (10) refers to the surface on which an image is displayed by the panel (PNL). Since the display device (10) is folded with respect to the folding axis (A1), the top frame (TF) can include two top frames (TF1, TF2) that are physically separated from each other. The top frame (TF) includes a first top frame (TF1) disposed on one side with respect to the folding axis (A1) and a second top frame (TF2) disposed on the other side. The height from the lower surface of the display device (10) to the top frame (TF) may be higher than or substantially the same as the height to the panel (PNL). As a result, the panel (PNL) may not be visible when observed from the side. The first top frame (TF1) and the second top frame (TF2) are as shown in FIG. 3.

[0035] The side surface and the back surface of the display device (10) may be covered by a cover frame (CF). The back surface of the display device (10) is the opposite surface of the front surface, and the side surface refers to the surface between the front surface and the back surface. Since the display device (10) is folded with respect to the folding axis (A1), the cover frame (CF) may include two cover frames (CF1, CF2) that are physically separated from each other. The cover frame (CF) includes a first cover frame (CF1) disposed on one side with respect to the folding axis (A1) and a second cover frame (CF2) disposed on the other side. The first cover frame (CF1) and the second cover frame (CF2) are as shown in FIG. 3.

[0036] The infolding hinge assembly (IHA) is disposed near the back of the display device (10) and is arranged along the folding axis (A1). The infolding hinge assembly (IHA) may be arranged to be covered by the cover frames (CF1, CF2) in the unfolded state. In the unfolded state, the infolding hinge assembly (IHA) of the display device (10) may be arranged so as not to be visible from the outside. Or, in the unfolded state, the infolding hinge assembly (IHA) of the display device (10) may be arranged so that only a minimal portion is visible from the outside.

[0037] Although not shown, a camera module capable of capturing images may be disposed on the front, back, and / or side surfaces of the display device (10). Also, buttons capable of controlling the functions of the display device and configurations capable of performing functions may be disposed on the front, back, and / or side surfaces of the display device. For example, volume buttons, power buttons, mode switching buttons, speakers, microphones, antennas, flashes, etc. may be disposed.

[0038] Although not shown, the display device (10) may include sensors for sensing the operating state or the external environment. For example, the display device (10) may include a gesture sensor, a grip sensor, a color sensor, an infrared sensor, an illuminance sensor, an ultrasonic sensor, an iris recognition sensor, a distance detection sensor, a LiDAR sensor, etc.

[0039] Although not shown, the display device (10) may include connectors capable of receiving signals from the outside. For example, it may include a charging connector, a USB connector, a headphone jack connector, etc.

[0040] Referring to FIG. 2, when the display device (10) is folded, the panel (PNL) is folded such that the first display area (DA1) and the second display area (DA2) face each other with respect to the folding axis (A1). The infolding hinge assembly (IHA) can be exposed to the outside when the cover frames (CF1, CF2) rotate and fold.

[0041] In the folded state, the panel (PNL) is not visible from the outside. Only the cover frames (CF, CF2) and the infolding hinge assembly (IHA) of the display device (10) are visible from the outside.

[0042] According to various embodiments, the cover frames (CF1, CF2) are not limited to the forms and connections shown in FIGS. 1 and 2, and may be implemented by other shapes and combinations of components. According to one embodiment, the first cover frame (CF1) and the second cover frame (CF2) may be arranged on both sides with respect to the folding axis (A1) and may have a shape that is overall symmetric with respect to the folding axis (A1). According to an embodiment, the first cover frame (CF1) and the second cover frame (CF2) may be arranged asymmetrically with respect to the folding axis (A1) and may have an asymmetric shape. According to an embodiment, depending on the folded state, unfolded state, and intermediate state of the display device (10), the angle and distance formed between the first cover frame (CF1) and the second cover frame (CF2) can be changed. According to one embodiment, each of the first cover frame (CF1) and the second cover frame (CF2) may be physically separated into a frame that covers only the back surface of the display device (10) and a frame that covers only the side surface.

[0043] According to various embodiments, the first cover frame (CF1) and the second cover frame (CF2) may form an internal accommodation space by structural connection. The infolding hinge assembly (IHA) and the panel (PNL) may be accommodated in the internal accommodation space.

[0044] According to various embodiments, components for driving the display device (10) may be arranged in the internal accommodation space. For example, a battery, a control printed circuit board, a flat cable, a flexible printed circuit board, etc. may be arranged in the internal accommodation space.

[0045] According to various embodiments, depending on the folding angle of the display device (10), the size of the portion of the in-folding hinge assembly (IHA) exposed to the outside may be different. For example, when the display device (10) is in the folded state, many portions of the in-folding hinge assembly (IHA) may be exposed between the first cover frame (CF1) and the second cover frame (CF2). When the display device (10) is in the unfolded state, the in-folding hinge assembly (IHA) can be substantially covered by the first cover frame (CF1) and the second cover frame (CF2). When the display device (10) is in an intermediate state between the folded state and the unfolded state, relatively few portions of the in-folding hinge assembly (IHA) may be exposed between the first cover frame (CF1) and the second cover frame (CF2).

[0046] According to various embodiments, when the display device (10) is in the unfolded state, the angle formed between the first cover frame (CF1) and the second cover frame (CF2) may be 180°. Accordingly, the angle formed between the first display area (DA1) and the second display area (DA2) may be 180°. Accordingly, the panel (PNL) can be in a completely flat state.

[0047] According to various embodiments, when the display device (10) is in an intermediate state between the folded state and the unfolded state, the folding may be stopped at that folding angle. This is so-called free stop. According to various embodiments, the cover frame (CF) and the top frame (TF) may be formed from glass or a polymer. The cover frame (CF) and the top frame (TF) may be transparent or opaque. For example, the cover frame (CF) and the top frame (TF) may be formed by coated or colored glass, ceramic, polymer, aluminum, stainless steel, magnesium, or combinations thereof.

[0048] FIG. 3 is an exploded perspective view of a display device (10) according to various embodiments of the present disclosure.

[0049] In the present disclosure, a direction along the folding axis (A1) along which the display device (10) is folded is defined as the axial direction (AD). A direction from the first display area (DA1) of the display device (10), through the folding area (FA), to the second display area (DA2) is defined as the side direction (SD). A direction in which the panel (PNL) of the display device (10) faces is defined as the upper direction (UD). A direction opposite to the upper direction (UD) is defined as the lower direction (BD).

[0050] The top frame (TF) is disposed at the uppermost part in the upper direction (UD) of the display device (10). The top frame (TF) includes a first top frame (TF1) disposed on one side with respect to the folding axis (A1), and a second top frame (TF2) disposed on the other side. The top frame (TF) is disposed to cover the rim of the panel (PNL). The top frame (TF) can protect the panel (PNL) from external impacts. The top frame (TF) can form a bezel of the display device (10).

[0051] A panel assembly (PNLA) is disposed below the top frame (TF). The panel assembly (PNLA) includes a panel (PNL) and one or more plates (PLT). The panel (PNL) may include a flexible substrate, a circuit element layer disposed on the flexible substrate and including transistors, a light-emitting layer disposed on the circuit element layer and including light-emitting elements, an encapsulation layer disposed on the light-emitting layer, a touch layer disposed on or inside the encapsulation layer, a polarizing plate for reducing the reflected visual sensation on the front surface, a cover glass disposed on the touch layer, and the like. The panel (PNL) may include a first display area (DA1), a folding area (FA), and a second display area (DA2). The one or more plates (PLT) are disposed below the panel (PNL) and may include various plates for supporting the panel (PNL). For example, the one or more plates may include a back plate for supporting the panel (PNL), a top plate formed of a SUS material disposed below the back plate, a bottom plate formed of a SUS material disposed below the top plate and having a pattern formed in the folding portion, a heat dissipation sheet having a heat dissipation function, a middle plate for covering a non-flattened plane by various configurations of the hinge assembly, and the like.

[0052] An in-folding hinge assembly (IHA) is disposed below the panel assembly (PNLA). The in-folding hinge assembly (IHA) is disposed below the folding area (FA). The in-folding hinge assembly (IHA) may have a shape that is long along the axial direction (AD). The in-folding hinge assembly (IHA) may perform a folding motion in which one side and the other side rotate with respect to the folding axis (A1). A detailed description of the in-folding hinge assembly (IHA) will be described later with reference to FIG. 4A and the like.

[0053] A cover frame (CF) is disposed below the infolding hinge assembly (IHA). A receiving groove in which a part of the infolding hinge assembly (IHA) can be seated may be formed on the upper surface of the cover frame (CF). The cover frame (CF) includes a first cover frame (CF1) disposed on one side with respect to the folding axis (A1), and a second cover frame (CF2) disposed on the other side. The cover frame (CF) may be a housing that defines the side surface and the back surface of the display device (10). The cover frame (CF) can protect the display device (10) from external impacts. The cover frame (CF) may be coupled to the infolding hinge assembly (IHA). For example, the first cover frame (CF1) may be coupled to the lever wing (HM-1, see FIG. 5A) of the infolding hinge assembly (IHA). The second cover frame (CF2) may be coupled to the other lever wing (HM-1, see FIG. 5A). The pair of lever wings (HM-1) can rotate about an axis that is symmetric with respect to each other with respect to the folding axis (A1). Due to the rotational movement of the lever wing (HM-1), the coupled cover frames (CF1, CF2) can rotate. By the rotation of the cover frames (CF1, CF2), the folding and unfolding of the display device (10) can be realized.

[0054] FIG. 4A is a perspective view of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure as viewed from above.

[0055] FIG. 4B is an exploded perspective view of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure.

[0056] FIG. 4C is a perspective view of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure as viewed from the back.

[0057] FIG. 4D is a front view of a display device (10) according to an embodiment of the present disclosure as viewed from the front.

[0058] Figures 4A to 4D show the unfolded state of the display device (10). With reference to Figures 4A to 4D, an infolding hinge assembly (IHA) according to an embodiment of the present disclosure will be described. For clarity of explanation, unnecessary components are omitted from the illustration.

[0059] Referring to FIGS. 4A and 4B, the infolding hinge assembly (IHA) may have a length along the axial direction (AD). The infolding hinge assembly (IHA) includes a decoppin (Dec), an infolding hinge module (IHM), an up-down plate (UDP), a roller assembly (RA), a roller stopper (RS), and a hinge cover (HC).

[0060] The hinge cover (HC) may have a length along the axial direction (AD). The hinge cover (HC) does not rotate during folding and infolding. The hinge cover (HC) may have a substantially half-cylindrical shape. For example, the inner and outer shapes of the hinge cover (HC) may have a half-cylindrical shape. As another example, the inner shape of the hinge cover (HC) may have a half-cylindrical shape, and the outer shape may have a different shape (e.g., square, oval, etc.).

[0061] Other components may be housed in the accommodation space formed inside the hinge cover (HC). In particular, the in-folding hinge module (IHM) is housed inside the hinge cover (HC). The lever wing (HM-1) of the in-folding hinge module (IHM) (see Fig. 5A) rotates according to folding and in-folding. In order to guide the rotation of the lever wing (HM-1), the internal shape of the hinge cover (HC) may have a half-cylinder shape. In order to firmly fix the components housed in the accommodation space of the hinge cover (HC), a plurality of partition walls may be formed to partition the internal space of the hinge cover (HC). The components to be housed can be firmly fixed by being sandwiched between the partition walls and the partition walls. The hinge cover (HC) may include a plurality of fastening holes. Through the plurality of fastening holes, the hinge cover (HC) and other components can be coupled to each other. As a result, other components can be fixed to the hinge cover (HC). For example, by inserting screws into the plurality of fastening holes, the hinge cover (HC) and other components can be coupled to each other.

[0062] The deco pins (Dec) may be arranged at one end and the other end in the longitudinal direction of the hinge cover (HC). Referring to Fig. 4A, the deco pin (Dec1) arranged at one end of the hinge cover (HC) along the axial direction (AD) and the deco pin (Dec2) arranged at the other end are shown. The deco pins (Dec) can enhance the aesthetic sense when the in-folding hinge assembly (IHA) is observed from the outside of the display device (10). The deco pins (Dec) may be formed in various colors and various forms. The deco pins (Dec) can be fixed to the hinge cover (HC) by a slit shape.

[0063] The in-folding hinge module (IHM) can be seated in the accommodation space inside the hinge cover (HC). Referring to FIG. 4A, four in-folding hinge modules (IHM1, IHM2, IHM3, IHM4) seated inside the hinge cover (HC) along the axial direction (AD) are shown. The technical idea of the present disclosure is not limited to the number of in-folding hinge modules (IHM1). Some configurations of the in-folding hinge module (IHM) include configurations that rotate and configurations that do not rotate during folding and in-folding. Typically, the lever wing (HM-1) (refer to FIG. 5A) can rotate during folding and in-folding. The wing bottom (HM-2, refer to FIG. 5A) and the shaft bottom (HM-6) may be fixed without rotating during folding and in-folding. The surface in the lower direction (BD) of the in-folding hinge module (IHM) may be coupled to the cover frames (CF1, CF2) (refer to FIG. 3). When the in-folding hinge module (IHM) rotates during folding and in-folding, the cover frames (CF1, CF2) can also rotate. By the rotation of the cover frames (CF1, CF2), the display device (10) can be folded or in-folded.

[0064] Referring to FIG. 4C, the in-folding hinge module (IHM) may include a plurality of fastening holes (CH1) formed in the lower direction (BD). FIG. 4C shows, by way of example, five fastening holes (CH1) for one in-folding hinge module (IHM). Referring to FIG. 4B, the hinge cover (HC) may include a plurality of fastening holes (CH2). FIG. 4B shows, by way of example, five fastening holes (CH2) corresponding to one in-folding hinge module (IHM) for the hinge cover (HC). Through the plurality of fastening holes (CH1, CH2), the in-folding hinge module (IHM) can be fixed to the hinge cover (HC).

[0065] In addition, the infolding hinge module (IHM) may include a plurality of fastening holes (CH9, CH10). Through the plurality of fastening holes (CH9, CH10), the infolding hinge module (IHM) can be coupled to the cover frame (CF). In FIG. 4C, for one infolding hinge module (IHM), three fastening holes (CH9) and three fastening holes (CH10) are shown as an example. For example, the first cover frame (CF1, see FIG. 3) may include a plurality of fastening holes corresponding to the fastening holes (CH9). Through the fastening holes (CH9), the infolding hinge module (IHM) and the first cover frame (CF1) can be coupled to each other. The second cover frame (CF2, see FIG. 3) may include a plurality of fastening holes corresponding to the fastening holes (CH10). Through the fastening holes (CH10), the infolding hinge module (IHM) and the second cover frame (CF2) can be coupled to each other. A detailed description of the infolding hinge module (IHM) will be described later with reference to FIG. 5A and the like.

[0066] The up-down plate (UDP) may have a length along the axial direction (AD). In FIG. 4A, two up-down plates (UDP1, UDP2) are shown as an example for the infolding hinge assembly (IHA). The up-down plate (UDP) does not rotate during folding and infolding. The up-down plate (UDP) rises in the upper direction (UD) during unfolding. The up-down plate (UDP) descends in the lower direction (BD) during folding. When the up-down plate (UDP) rises during unfolding, it can support the panel assembly (PNLA) disposed on the upper portion of the up-down plate (UDP). By supporting the panel assembly (PNLA), the folding region (FA) of the panel (PNL) can be substantially flattened. Thereby, the crease formed in the folding region (FA) of the panel (PNL) can be removed. The up-down plate (UDP) may be disposed between adjacent in-folding hinge modules (IHM). For example, the up-down plate (UDP1) may be disposed between the in-folding hinge module (IHM1) and the in-folding hinge module (IHM2). The up-down plate (UDP2) may be disposed between the in-folding hinge module (IHM3) and the in-folding hinge module (IHM4).

[0067] The up-down plate (UDP) is coupled to the in-folding hinge module (IHM) so as to be capable of rising and falling. Referring to FIGS. 4B and 4C, the up-down plate (UDP) may include fastening holes (CH3). Two fastening holes (CH3) are shown by way of example. The in-folding hinge module (IHM1) and the in-folding hinge module (IHM2) may together include two fastening holes (CH4) by way of example. When the fastening hole (CH3) and the fastening hole (CH4) are coupled to each other, the spring (Spr1) and the fixing screw (SCR) are both coupled. By these structural couplings, the up-down plate (UDP) is coupled to the in-folding hinge module (IHM) so as to be capable of rising and falling. A detailed description of the up-down plate (UDP) will be described later with reference to FIG. 7A and the like.

[0068] The technical idea of the present disclosure is not limited to its terms. For example, the spring (Spr1) can be replaced with other configurations having an elastic force. The fixing screw (SCR) can be replaced with other configurations capable of fastening.

[0069] The roller assembly (RA) is arranged on both sides with respect to the axial direction (AD). As an example, two roller assemblies (RA1, RA2) are shown for two infolding hinge modules (IHM1, IHM2). The roller assembly (RA1) is arranged on one side with respect to the axial direction (AD). The roller assembly (RA2) is arranged on the other side with respect to the axial direction (AD).

[0070] The roller assembly (RA) is coupled to the cover frame (CF). The roller assembly (RA1) is coupled to the first cover frame (CF1). The roller assembly (RA2) is coupled to the second cover frame (CF2). Thereby, the roller assembly (RA) rotates together with the cover frame (CF) during folding and infolding.

[0071] Based on the same criterion, the roller assembly (RA3) is coupled to the first cover frame (CF1), and the roller assembly (RA4) is coupled to the second cover frame (CF2). The roller assembly (RA) generates a force that brings the cover frames (CF1, CF2) into close contact with each other in the unfolded state.

[0072] The roller stopper (RS) is arranged in the accommodation space of the hinge cover (HC). The roller stopper (RS) is arranged between a pair of roller assemblies (RA1, RA2). As an example, one roller stopper (RS1) is shown for two roller assemblies (RA1, RA2). The roller stopper (RS1) is arranged between the roller assembly (RA1) and the roller assembly (RA2). The roller stopper (RS2) is arranged between the roller assembly (RA3) and the roller assembly (RA3).

[0073] The roller stopper (RS) receives a force pushed in the axial direction (AD) generated by the roller assembly (RA). By the generation and support of the force between the roller assembly (RA) and the roller stopper (RS), the display device (10) has an increased holding force to maintain the unfolded state. That is, by the roller assembly (RA) and the roller stopper (RS), the display device (10) can be in a substantially 180° flat state in the unfolded state. Thus, the switching from the unfolded state to the folded state can be started only when a folding force greater than a predetermined force is applied to the display device (10). In addition, since the display device (10) is unfolded substantially 180°, the up-down plate (UDP) can be maximally raised. Thereby, the creases generated in the folding area (FA) of the panel (PNL) can be completely or maximally removed.

[0074] Referring to FIG. 4C, for one roller stopper (RS), the roller stopper (RS) includes, as an example, two fastening holes (CH5) in the lower direction (BD). Referring to FIG. 4B, for one roller stopper (RS), the hinge cover (HC) includes, as an example, two fastening holes (CH6) in the upper direction. By the coupling of the fastening hole (CH5) and the fastening hole (CH6), the roller stopper (RS) can be seated inside the hinge cover (HC).

[0075] Referring to FIG. 4C, the roller assembly (RA) includes a plurality of fastening holes (CH7, CH8). For one roller assembly (RA1), two fastening holes (CH7) are shown by way of example, and for one roller assembly (RA2), two fastening holes (CH8) are shown by way of example. In the first cover frame (CF1, see FIG. 3), fastening holes corresponding to the plurality of fastening holes (CH7) are formed. Through the plurality of fastening holes (CH7), the roller assembly (RA1) can be coupled to the first cover frame (CF1). In the second cover frame (CF2, see FIG. 3), fastening holes corresponding to the plurality of fastening holes (CH8) are formed. Through the plurality of fastening holes (CH8), the roller assembly (RA2) can be coupled to the second cover frame (CF2).

[0076] Detailed descriptions of the roller assembly (RA) and the roller stopper (RS) will be described later with reference to FIG. 7A and the like.

[0077] Referring to FIG. 4D, the infolding hinge assembly (IHA) is coupled to the cover frame (CF). Specifically, on one side with respect to the folding axis (A1), the first cover frame (CF1) and the infolding hinge assembly (IHA) are coupled to each other. On the other side with respect to the folding axis (A1), the second cover frame (CF2) and the infolding hinge assembly (IHA) are coupled to each other. Some components of the infolding hinge assembly (IHA) rotate with respect to the folding axis (A1). For example, a pair of lever wings (HM-1, see FIG. 5A) of the infolding hinge assembly (IHA) rotate so as to face each other. By the folding operation of the infolding hinge assembly (IHA), the first cover frame (CF1) and the second cover frame (CF2) can be folded so as to face each other. By the unfolding operation of the infolding hinge assembly (IHA), the first cover frame (CF1) and the second cover frame (CF2) can be unfolded so as to be 180° apart from each other in the side direction (SD).

[0078] In the upward direction (UD) of the infolding hinge assembly (IHA) and the cover frame (CF), a panel assembly (PNLA, see FIG. 3) may be arranged. The panel assembly (PNLA) includes one or more plates (PLT) arranged at the lower part and a panel (PNL) arranged at the upper part. By the folding operation of the infolding hinge assembly (IHA), the first display area (DA1, see FIG. 3) and the second display area (DA2, see FIG. 3) can be folded so as to face each other. By the unfolding operation of the infolding hinge assembly (IHA), the first display area (DA1) and the second display area (DA2) can be unfolded so as to be 180° with respect to each other in the side direction (SD). Also, by the upward movement of the up-down plate (UDP) of the infolding hinge assembly (IHA), the panel assembly (PNLA) can be supported by the up-down plate (UDP) during unfolding. Thereby, the crease formed in the folding area (FA, see FIG. 3) of the panel (PNL) can be improved. Also, due to the holding force generated by the roller assembly (RA) and the roller stopper (RS) of the infolding hinge assembly (IHA), the panel (PNL) can be unfolded so as to be substantially 180° during unfolding.

[0079] FIG. 5A is a perspective view of an infolding hinge module (IHM) according to an embodiment of the present disclosure as viewed from above.

[0080] FIG. 5B is an exploded perspective view of an infolding hinge module (IHM) according to an embodiment of the present disclosure.

[0081] FIG. 5C is a perspective view of an infolding hinge module (IHM) according to an embodiment of the present disclosure as viewed from the back.

[0082] Figures 5A to 5C show the unfolded state of the in-folding hinge module (IHM). Referring to Figures 5A to 5C, the in-folding hinge module (IHM) according to an embodiment of the present disclosure will be described. For clarity of explanation, unnecessary components are omitted in the illustration.

[0083] Referring to FIGS. 5A to 5C, the in-folding hinge module (IHM) includes a pair of lever wings (HM-1), wing bottoms (HM-2), a pair of wing guides (HM-3), a plurality of gear guides (HM-4), a plurality of gears (HM-5), a shaft bottom (HM-6), a pair of lift washers (HM-7), a lift washer guide (HM-8), a plurality of disc springs (HM-9), a plurality of washers (HM-10), a pair of press nuts (HM-11), and a pair of shafts (HM-12).

[0084] The pair of lever wings (HM-1) has a relatively large plate shape. The pair of lever wings (HM-1) is rotatably coupled to the wing bottoms (HM-2). Referring to FIG. 5B, the pair of lever wings (HM-1) includes rotation protrusions (RB). The rotation protrusions (RB) may have the form of half cylinders. As shown in the illustration, each of the pair of lever wings (HM-1) may include two rotation protrusions (RB) by way of example. Inside the wing bottoms (HM-2), rotation guides (RG) having a shape corresponding to the rotation protrusions (RB) are formed. As shown in the illustration, four rotation guides (RG) may be formed inside the wing bottoms (HM-2) by way of example. The pair of lever wings (HM-1) and the wing bottoms (HM-2) are coupled to each other such that the rotation protrusions (RB) and the rotation guides (RG) mesh with each other. The pair of lever wings (HM-1) rotates so as to face each other during the folding operation of the display device (10). The pair of lever wings (HM-1) rotates so as to form 180° with each other during the unfolding operation of the display device (10).

[0085] As shown in FIG. 5C, a pair of lever wings (HM-1) includes a plurality of fastening holes (CH9, CH10) on the surface in the lower direction (BD). The fastening hole (CH9) is connected to the first cover frame (CF1, see FIG. 3). The fastening hole (CH10) is connected to the second cover frame (CF2, see FIG. 3). As shown in the drawing, each of the pair of lever wings (HM-1) includes, by way of example, three fastening holes (CH9, CH10). In conjunction with the rotational movement of the pair of lever wings (HM-1), the cover frames (CF1, CF2) can perform a rotational movement. As a result, the display device (10) can perform folding and unfolding operations.

[0086] The wing bottom (HM-2) is disposed in the lower direction (BD) of the pair of lever wings (HM-1). The wing bottom (HM-2) is coupled to the pair of lever wings (HM-1). The wing bottom (HM-2) is fixed without rotating during the folding operation of the display device (10). A rotation guide (RG) is formed inside the wing bottom (HM-2).

[0087] The wing bottom (HM-2) is accommodated in the accommodation space of the hinge cover (HC). The wing bottom (HM-2) includes a plurality of fastening holes (CH1). The hinge cover (HC) includes a plurality of fastening holes (CH2, see FIG. 4B). Through the fastening hole (CH1) and the fastening hole (CH2), the wing bottom (HM-2) can be fixed within the accommodation space of the hinge cover (HC). By way of example, the wing bottom (HM-2) is shown as including four fastening holes (CH1). For reference, fastening holes (CH1) are also formed in the lower direction (BD) in the shaft bottom (HM-6) described later, and through this fastening hole (CH1), the shaft bottom (HM-6) is coupled to the hinge cover (HC). The wing bottom (HM-2) includes an opening (OP1). The head portions (SH) of the pair of shafts (HM-12) are fastened to the opening (OP1).

[0088] The pair of wing guides (HM-3) may be shaped to have a length in the side direction (SD). The pair of wing guides (HM-3) is fastened to the pair of lever wings (HM-1). Each of the pair of wing guides (HM-3) includes a slide projection (SB, see FIG. 6C). Each of the pair of lever wings (HM-1) includes a slide guide (SG, see FIG. 6C). The slide projection (SB) is fastened to the slide guide (SG). When the pair of lever wings (HM-1) makes a rotational movement, the pair of wing guides (HM-3) makes a rotational movement in conjunction with this.

[0089] Each of the pair of wing guides (HM-3) includes an opening (OP2). The pair of shafts (HM-12) passes through the opening (OP2). When the pair of wing guides (HM-3) comes to make a rotational movement, the pair of shafts (HM-12) rotates. The rotational movement of the pair of shafts (HM-12) is a rotational movement that rotates about the axis of the shaft.

[0090] The plurality of gear guides (HM-4) and the plurality of gears (HM-5) are arranged in the upper direction (UD) of the shaft bottom (HM-6). As an example, two of the plurality of gear guides (HM-4) may be arranged along the axial direction (AD). A plurality of gears (HM-5) are arranged between the two gear guides (HM-4). As an example, the plurality of gears (HM-5) are shown as being four. The plurality of gear guides (HM-4) include an opening (OP3). The plurality of gears (HM-5) include an opening (OP4). A pair of shafts (HM-12) penetrate through the opening (OP3) and the opening (OP4). Referring to FIG. 5B, the pair of shafts (HM-12) penetrate through two openings (OP3) formed at the outermost sides in the side direction (SD) among the openings (OP3) formed in the gear guide (HM-4). Further, the pair of shafts (HM-12) penetrate through openings (OP4) formed in two gears (HM-5) formed at the outermost sides in the side direction (SD) among the plurality of gears (HM-5). When the pair of shafts (HM-12) perform a rotational operation, the plurality of gears (HM-5) perform a rotational operation. When the pair of shafts (HM-12) perform a rotational operation, the plurality of gear guides (HM-4) do not rotate.

[0091] A pair of lift washers (HM-7) and a lift washer guide (HM-8) are disposed above the shaft bottom (HM-6). Each of the pair of lift washers (HM-7) is disposed on both sides with respect to the folding axis (A1).

[0092] Each of the pair of lift washers (HM-7) includes an opening (OP5). A pair of shafts (HM-12) penetrate through the opening (OP5). When the pair of shafts (HM-12) perform a rotational operation, the pair of lift washers (HM-7) perform a rotational operation. The lift washer guide (HM-8) contacts the pair of lift washers (HM-7). The lift washer guide (HM-8) includes an opening (OP6). Even when the pair of shafts (HM-12) perform a rotational operation, the lift washer guide (HM-8) does not perform a rotational operation.

[0093] A pair of lift washers (HM-7) includes lift protrusions (LB, see Fig. 7C). The lift protrusions (LB) contact the up-down plate (UDP). Referring to Figs. 7B and 7C described later, when the display device (10) is folded, the lift protrusions (LB) rotate downward and no longer contact the up-down plate (UDP), and the up-down plate (UDP) descends. When the display device (10) is unfolded, the lift protrusions (LB) rotate upward and come into contact with the up-down plate (UDP), raising the up-down plate (UDP).

[0094] A plurality of disk springs (HM-9), a plurality of washers (HM-10) and a pair of press nuts (HM-11) are arranged above the shaft bottom (HM-6). The plurality of disk springs (HM-9) include an opening (OP7). The plurality of washers (HM-10) include an opening (OP8). The pair of press nuts (HM-11) include an opening (OP9). A pair of shafts (HM-12) penetrate through the openings (OP7, OP8, OP9). The pair of press nuts (HM-11) keep the plurality of disk springs (HM-9) in close contact with each other. When the plurality of disk springs (HM-9) are compressed, a torque is generated by frictional force to prevent the rotation of the pair of shafts (HM-12). This enables a so-called free stop in an intermediate state between folding and unfolding.

[0095] The pair of shafts (HM-12) has a length in the axial direction (AD). The pair of shafts (HM-12) is disposed above the shaft bottom (HM-6). The pair of shafts (HM-12) includes a head (SH) and a tail (ST). The head (SH) is fastened to the opening (OP1) of the wing bottom (HM-2). The tail (ST) is fastened to the opening (OP10) of the shaft bottom (HM-6). The body between the head (SH) and the tail (SD) of the pair of shafts (HM-12) passes through a pair of wing guides (HM-3), a plurality of gear guides (HM-4), a plurality of gears (HM-5), a pair of lift washers (HM-7), a lift washer guide (HM-8), a plurality of disc springs (HM-9), a plurality of washers (HM-10), and a pair of press nuts (HM-11).

[0096] When the folding and unfolding operations of the display device (10) occur, the cover frame (CF) rotates. When the cover frame (CF) rotates, the pair of lever wings (HM-1) coupled thereto rotates. When the pair of lever wings (HM-1) rotates, the pair of wing guides (HM-3) coupled thereto rotates. When the pair of wing guides (HM-3) rotates, the pair of shafts (HM-12) rotates. When the pair of shafts (HM-12) rotates, the plurality of gears (HM-5) rotates. By rotating the plurality of gears (HM-5), the folding and unfolding sync of the display device (10) can be adjusted. When the pair of shafts (HM-12) rotates, the pair of lift washers (HM-7) rotates. By rotating the pair of lift washers (HM-7), the lift protrusion (LB) rotates and the up-down plate (UDP) can perform a rising operation.

[0097] The shaft bottom (HM-6) is disposed at the lower part of a pair of shafts (HM-12). The shaft bottom (HM-6) includes an opening (OP10). The tails (ST) of the pair of shafts (HM-12) are fastened to the opening (OP10). The shaft bottom (HM-6) includes a fastening hole (CH11). Referring to FIG. 5C, the wing bottom (HM-2) and the shaft bottom (HM-6) can be coupled to each other through the fastening hole (CH11). The shaft bottom (HM-6) includes a fastening hole (CH1). The shaft bottom (HM-6) can be coupled to the hinge cover (HC) through the fastening hole (CH1).

[0098] Referring to FIG. 5B, the shaft bottom (HM-6) includes a fastening hole (CH4). Referring to FIG. 4C, as described above, the up-down plate (UDP) includes a fastening hole (CH3). The fastening hole (CH3) and the fastening hole (CH4) are coupled to each other, and the spring (Spr1) and the fixing screw (SCR) are both coupled. Thereby, the up-down plate (UDP) is coupled to the shaft bottom (HM6) so as to be able to move up and down. The up-and-down movement of the up-down plate (UDP) will be described later with reference to FIG. 7A and the like. FIG. 6A is a view showing a folding state of the display device (10) according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line A-A' in FIGS. 5A and 5C. FIG. 6B is a view showing an unfolded state of the display device (10) according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line A-A' in FIGS. 5A and 5C.

[0099] Referring to FIGS. 6A and 6B, the folding and unfolding operations of the display device (10) will be described. For clarity of explanation, unnecessary components are omitted in the illustration. For clarity of explanation, a part of the panel assembly (PNLA) is further shown.

[0100] The wing bottom (HM-2) is seated within the hinge cover (HC). The pair of lever wings (HM-1) are rotated so as to face each other. This is because the rotation protrusions (RB) of each of the pair of lever wings (HM-1) have rotated in the R1 direction. The pair of lever wings (HM-1) are connected to the cover frame (CF, see FIG. 4D). The fastening hole (CH9) is a hole for connecting the first cover frame (CF1, see FIG. 4D) and one of the pair of lever wings (HM-1), and the fastening hole (CH10) is a hole for connecting the second cover frame (CF2, see FIG. 4D) and the other of the pair of lever wings (HM-1). Since the pair of lever wings (HM-1) are arranged to face each other, the first cover frame (CF1) and the second cover frame (CF2) come to face each other. The panel assembly (PNLA) includes a panel (PNL, see FIG. 3) and one or more plates (PLT, see FIG. 3). The panel assembly (PNLA) is supported by the first cover frame (CF1) and the second cover frame (CF2). Thereby, the panel assembly (PNLA) is in a folded state as shown in FIG. 6A.

[0101] Referring to FIG. 6B, the wing bottom (HM-2) is seated within the hinge cover (HC). A pair of lever wings (HM-1) are positioned such that the angle formed between them is 180°. This is because the rotation protrusions (RB) of each of the pair of lever wings (HM-1) have rotated in the R2 direction. The pair of lever wings (HM-1) are connected to the cover frame (CF, see FIG. 4D). The fastening hole (CH9) is a hole for connecting the first cover frame (CF1, see FIG. 4D) and one of the pair of lever wings (HM-1), and the fastening hole (CH10) is a hole for connecting the second cover frame (CF2, see FIG. 4D) and the other of the pair of lever wings (HM-1). Since the pair of lever wings (HM-1) are arranged such that they form 180° with each other, the first cover frame (CF1) and the second cover frame (CF2) are arranged such that they form 180° with each other. The panel assembly (PNLA) includes a panel (PNL, see FIG. 3) and one or more plates (PLT, see FIG. 3). The panel assembly (PNLA) is supported by the first cover frame (CF1) and the second cover frame (CF2). As a result, the panel assembly (PNLA) is in an unfolded state as shown in FIG. 6B.

[0102] FIG. 6C is a perspective view showing the folding state of the display device (10) according to an embodiment of the present disclosure.

[0103] FIG. 6D is a perspective view showing the unfolded state of the display device (10) according to an embodiment of the present disclosure.

[0104] Referring to FIGS. 6C and 6D, a pair of lever wings (HM-1) and a pair of wing guides (HM-3) during the folding and unfolding operations of the display device (10) will be described.

[0105] Referring to FIGS. 6C and 6D, the wing bottom (HM-2) is seated within the hinge cover (HC). The fastening holes (CH1) formed in the wing bottom (HM-2) and the fastening holes (CH2) formed in the hinge cover (HC) are coupled to each other. By the coupling between the fastening holes (CH1) and the fastening holes (CH2), the wing bottom (HM-2) can be fixed within the hinge cover (HC). The cover frame (CF, see FIG. 4D) is coupled to the pair of lever wings (HM-1) via the fastening holes (CH10). The pair of lever wings (HM-1) is coupled to the pair of wing guides (HM-3). The wing guide (HM-3) includes a slide protrusion (SB), and the lever wing (HM-1) includes a slide guide (SG). Comparing the folding state with reference to FIG. 6C and the unfolding state with reference to FIG. 6D with each other, the slide protrusion (SB) slides within the slide guide (SG) according to the folding and unfolding states. The display device (10) according to the present disclosure is folded or unfolded about the folding axis (A1). The infolding hinge module (IHM) according to the present disclosure has two rotation axes by the pair of shafts (HM-12). The slide protrusion (SB) and the slide guide (SG) can enable the interlocking of the two rotation axes and one folding axis (A1) as described above.

[0106] FIG. 7A is a perspective view of a portion of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure.

[0107] FIG. 7B is a view showing the folding state of the infolding hinge assembly (IHA) according to an embodiment of the present disclosure, which is a cross-sectional view taken along the line B-B' of FIG. 7A.

[0108] FIG. 7C is a view showing the unfolding state of the infolding hinge assembly (IHA) according to an embodiment of the present disclosure, which is a cross-sectional view taken along the line B-B' of FIG. 7A.

[0109] FIG. 7D is a diagram showing the folded state of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line C-C' of FIG. 7A.

[0110] FIG. 7E is a diagram showing the unfolded state of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line C-C' of FIG. 7A.

[0111] Referring to FIGS. 7A to 7E, the operation of the up-down plate (UDP) in the folded state and the unfolded state of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure will be described. For clarity of explanation, unnecessary components are omitted from the illustration.

[0112] Referring to FIG. 7A, a hinge cover (HC) is shown, and a shaft bottom (HM-6) is seated inside the hinge cover (HC). Inside the shaft bottom (HM-6), a pair of lift washers (HM-7) are arranged. The lift washers (HM-7) can support the up-down plate (UDP). The up-down plate (UDP) includes fastening holes (CH3, see FIG. 4B), and the shaft bottom (HM-6) includes fastening holes (CH4, see FIG. 4B). The fastening holes (CH3) and the fastening holes (CH4) are coupled to each other, and at this time, they are coupled by a spring (Spr1, see FIG. 4B) and a fixing screw (SCR, see FIG. 4B). The up-down plate (UDP) is coupled to the shaft bottom (HM-6) so as to be able to move up and down. The cut line B-B' for displaying the cross section is a line that cuts through the lift washers (HM-7). The cut line C-C' for displaying the cross section is a line that cuts through the fastening holes (CH3, CH4).

[0113] Referring to FIG. 7B, a shaft bottom (HM-6) is seated inside a hinge cover (HC). A pair of lift washers (HM-7) are shown. Each of the pair of lift washers (HM-7) includes a lift protrusion (LB). For illustrative purposes, the lift washer (HM-7) may have a substantially circular outer peripheral surface and a polygonal shape inner peripheral surface. Thus, the opening (OP5) of the lift washer (HM-7) may be polygonal. The lift protrusion (LB) is a protruding shape formed on the outer peripheral surface of the lift washer (HM-7). Due to the lift protrusion (LB), the outer peripheral surface of the lift washer (HM-7) is partially increased in radius. The pair of lift washers (HM-7) rotate in conjunction with the rotation of a pair of shafts (HM-12). The outer peripheral surface of the pair of shafts (HM-12) may be a polygonal shape corresponding to the outer peripheral surface of the pair of lift washers (HM-7). In the folding state, the lift protrusion (LB) may be positioned to face the lower direction (BD). The lift protrusion (LB) does not contact the up-down plate (UDP).

[0114] Referring to FIG. 7C, a shaft bottom (HM-6) is seated inside a hinge cover (HC). When in the unfolded state, the pair of shafts (HM-12) rotate in the R3 direction. By the rotation of the pair of shafts (HM-12), the pair of lift washers (HM-7) also rotate in the R3 direction. By the rotation of the pair of lift washers (HM-7), the lift protrusion (LB) contacts the up-down plate (UDP) and can raise the up-down plate (UDP).

[0115] Referring to FIGS. 7D and 7E, a shaft bottom (HM-6) is seated inside a hinge cover (HC). The shaft bottom (HM-6) includes a fastening hole (CH4). The fastening hole (CH4) may be an empty space. An up-down plate (UDP) is disposed on the upper part of the shaft bottom (HM-6). The up-down plate (UDP) includes a fastening hole (CH3). The fastening hole (CH3) and the fastening hole (CH4) may be in a cylinder form. The diameter of the fastening hole (CH3) may be smaller than the diameter of the fastening hole (CH4). Thus, the fastening hole (CH3) may be in a shape that penetrates the fastening hole (CH4).

[0116] A fixing screw (SCR) is disposed inside the fastening hole (CH4) of the shaft bottom (HM-6). The fixing screw (SCR) may be fastened to the up-down plate (UDP). For illustrative purposes, a thread may be formed on the outer peripheral surface of the fastening hole (CH3) of the up-down plate (UDP), and the fixing screw (SCR) may be a screw. When the fixing screw (SCR) is rotated, the fixing screw (SCR) can be fastened to the fastening hole (CH3) in a screw manner. Thus, when the up-down plate (UDP) rises or falls, the fixing screw (SCR) rises or falls together with the up-down plate (UDP). A spring (Spr1) is disposed inside the fastening hole (CH4). One end of the spring (Spr1) is fixed to the shaft bottom (HM-6), and the other end is fixed to the fixing screw (SCR).

[0117] A pair of shafts (HM-12) can penetrate a plurality of disc springs (HM-9).

[0118] Referring to FIG. 7D, in the state where the display device (10) is folded, the up-down plate (UDP) can descend. When the up-down plate (UDP) descends, the fixing screw (SCR) also descends together. As a result, the spring (Spr1) is in a relaxed state. Referring to FIG. 7E, in the state where the display device (10) is unfolded, the up-down plate (UDP) can ascend. When the up-down plate (UDP) ascends, the fixing screw (SCR) also ascends together. As a result, the spring (Spr1) is in a contracted state. That is, when the spring (Spr1) changes from the contracted state (i.e., the unfolded state of the display device) to the relaxed state (i.e., the folded state of the display device), the spring (Spr1) can naturally generate a force to lower the up-down plate (UDP).

[0119] The up-down plate (UDP) is disposed in the folding area (FA) of the display device (10) (see FIGS. 3 and 4D). The up-down plate (UDP) descends in the folded state but ascends in the unfolded state. When the up-down plate (UDP) ascends, it can support the upper panel assembly (PNLA). When the display device (10) repeats the folding and unfolding operations, there is a problem that wrinkles are generated in the folding area (FA), especially in the unfolded state, and are visible to the user. Also, the wrinkles in the folding area (FA) may cause inconvenience to the user's touch operation or pen input operation. According to the present disclosure, by the up-down plate (UDP) ascending and supporting the panel assembly (PNLA) in the unfolded state, the crease can be improved.

[0120] Also, the up-down plate (UDP) is connected to the fixing screw (SCR). The fixing screw (SCR) is connected to the spring (Spr1). When the fixing screw (SCR) descends during folding, the spring (Spr1) becomes relaxed, so that the descent of the up-down plate (UDP) can be made smooth.

[0121] FIG. 7F is a perspective view for explaining the connection of the up-down plate (UDP), the shaft bottom (HM-6), and the hinge cover (HC) according to an embodiment of the present disclosure.

[0122] FIG. 7G is a cross-sectional view for explaining the connection of the up-down plate (UDP), the shaft bottom (HM-6), and the hinge cover (HC) according to an embodiment of the present disclosure.

[0123] Referring to FIGS. 7F and 7G, the connection of the up-down plate (UDP), the shaft bottom (HM-6), and the hinge cover (HC) will be described.

[0124] Referring to FIGS. 7F and 7G, the up-down plate (UDP) includes fastening holes (CH3) formed in the lower direction (BD). As shown, the up-down plate (UDP) may include two fastening holes (CH3) by way of example.

[0125] The shaft bottom (HM-6) is disposed in the lower direction (BD) of the up-down plate (UDP). The shaft bottom (HM-6) includes a plurality of fastening holes (CH1, CH4, CH11). As shown in the figure, one shaft bottom (HM-6) includes, by way of example, one fastening hole (CH1), one fastening hole (CH4), and one fastening hole (CH11). The fastening hole (CH1) is a hole for fixing the shaft bottom (HM-6) to the hinge cover (HC). The fastening hole (CH4) is a hole for coupling the shaft bottom (HM-6) and the up-down plate (UDP) to each other. The fastening hole (CH11) is a hole for coupling the shaft bottom (HM-6) and the wing bottom (HM-2, see FIG. 5C) to each other.

[0126] The hinge cover (HC) is disposed in the lower direction (BD) of the shaft bottom (HM-6). The hinge cover (HC) includes a fastening hole (CH2). As shown in the figure, the hinge cover (HC) includes one fastening hole (CH2).

[0127] The spring (Spr1) and the fixing screw (SCR) are disposed between the lower part of the shaft bottom (HM-6) and the hinge cover (HC). Specifically, the spring (Spr1) and the fixing screw (SCR) are disposed so as to be inserted into the fastening hole (CH4) in the lower direction (BD) of the fastening hole (CH4) of the shaft bottom (HM-6).

[0128] The fastening hole (CH3) of the up-down plate (UPD) is fastened to the fastening hole (CH4) of the shaft bottom (HM-6). Specifically, the fastening hole (CH3) is inserted into the fastening hole (CH4). Each of the fastening hole (CH3) and the fastening hole (CH4) may be in a cylinder shape. The radius of the fastening hole (CH3) may be smaller than the radius of the fastening hole (CH4). Thereby, the fastening hole (CH3) can rise and fall inside the fastening hole (CH4).

[0129] The fixing screw (SCR) may be fastened to the up-down plate (UDP). For illustrative purposes, threads are formed on the inner surface of the fastening hole (CH3) of the up-down plate (UDP), and the fixing screw (SCR) may be a screw. The fixing screw (SCR) can be rotated and fastened to the fastening hole (CH3) in a screw manner. Thereby, when the up-down plate (UDP) rises or falls, the fixing screw (SCR) rises or falls in conjunction with it.

[0130] One end of the spring (Spr1) is fixed to the shaft bottom (HM-6), and the other end is connected to the fixing screw (SCR). In a state where the display device (10) is folded, the up-down plate (UDP) can descend. When the up-down plate (UDP) descends, the fixing screw (SCR) also descends together. Thereby, the spring (Spr1) is in a relaxed state. In a state where the display device (10) is unfolded, the up-down plate (UDP) rises. When the up-down plate (UDP) rises, the fixing screw (SCR) also rises together. Thereby, the spring (Spr1) is in a contracted state.

[0131] The fastening hole (CH1) of the shaft bottom (HM-6) and the fastening hole (CH2) of the hinge cover (HC) are coupled to each other. Thereby, the shaft bottom (HM-6) can be fixed to the inner accommodation space of the hinge cover (HC) through the fastening holes (CH1, CH2). The fastening hole (CH11) of the shaft bottom (HM-6) is a hole for coupling with the wing bottom (HM-2) (see FIG. 5C).

[0132] FIG. 8A is a perspective view showing a part of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure.

[0133] FIG. 8B is a perspective view showing an exploded state of a roller assembly (RA) and a roller stopper (RS) according to an embodiment of the present disclosure.

[0134] FIG. 8C is a diagram showing the unfolded state of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line D-D' of FIG. 8A.

[0135] FIG. 8D is a diagram showing the folding state of an infolding hinge assembly (IHA) according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line D-D' of FIG. 8A.

[0136] Referring to FIGS. 8A to 8D, the operation of a roller assembly (RA) and a roller stopper (RS) in the folding state and the unfolded state according to an embodiment of the present disclosure will be described. For clarity of explanation, unnecessary components are omitted from the illustration.

[0137] Referring to FIG. 8A, a hinge cover (HC) is shown, and a roller stopper (RS) is seated inside the hinge cover (HC). The roller stopper (RS) includes a fastening hole (CH5). The hinge cover (HC) includes fastening holes (CH6, see FIG. 4B). The fastening hole (CH5) and the fastening hole (CH6) can be coupled to each other, whereby the roller stopper (RS) can be fixed within the internal accommodation space of the hinge cover (HC). As shown, each of the fastening hole (CH5) and the fastening hole (CH6) may be two by way of example.

[0138] As shown, a pair of roller assemblies (RA1, RA2) may be arranged for one roller stopper (RS). Each of the pair of roller assemblies (RA1, RA2) may be arranged at a position symmetric with respect to the axial direction (AD). Each of the pair of roller assemblies (RA1, RA2) may be identical to each other and have a symmetric form with respect to each other.

[0139] The roller assembly (RA) includes a roller (R), an inner housing (RIH), an outer housing (ROH), a spring (Spr2), and a spring holder (RSH).

[0140] The roller (R) may be a cylindrical roller having a length in the axial direction (AD). The roller (R) can rotate with reference to the rolling axis. The rolling axis is in the same direction as the axial direction (AD). The outer peripheral surface of the roller (R) may be in contact with the side surface of the roller stopper (RS) in the unfolded state or may be out of contact in the folded state. The roller (R) may be formed of a material having an elastic force. For example, the roller (R) may be formed of rubber or elastic foam. When the roller (R) is formed of a material having an elastic force, the adhesive force can be strengthened when the roller (R) contacts the roller stopper (RS).

[0141] The roller (R) is fixed to the inner housing (RIH). When the inner housing (RIH) moves, the roller (R) moves together along with the movement.

[0142] The inner housing (RIH) and the outer housing (ROH) are arranged in the side direction (SD) of the roller (R). The inner housing (RIH) is in a form inserted into the outer housing (ROH), and the outer housing (ROH) may be in a form surrounding the inner housing (RIH). The inner housing (RIH) can reciprocate in the side direction (SD) inside the outer housing (ROH). That is, the length of the inner housing (RIH) in the side direction (SD) is shorter than the length of the outer housing (ROH) in the side direction (SD).

[0143] The outer housing (ROH) includes fastening holes (CH7, CH8). As shown, for example, two fastening holes (CH7) and two fastening holes (CH8) may be formed by way of illustration. Although not shown, the cover frame (CF, see Figure 3) includes fastening holes corresponding to the fastening holes (CH7) and fastening holes corresponding to the fastening holes (CH8). Through the fastening holes (CH7, CH8), the roller assembly (RA) can be coupled to the cover frame (CF). The roller assembly (RA1) disposed on one side may be coupled to the first cover frame (CF1, see Figure 3) through the fastening hole (CH7). The roller assembly (RA2) disposed on the other side may be coupled to the second cover frame (CF2, see Figure 3) through the fastening hole (CH8).

[0144] A spring holder (RSH) is disposed inside the inner housing (RIH). The spring holder (RSH) may be integral with the inner housing (RIH). That is, the spring holder (RSH) may be a columnar shape protruding from the inner housing (RIH). Also, the spring holder (RSH) may be a column having a long shape in the side direction (SD).

[0145] The spring (Spr2) is inserted into the spring holder (RSH). The spring (Spr2) can be other types of configurations having elasticity without being limited to that term. The spring (Spr2) may be disposed to have a length in the side direction (SD). One side of the spring (Spr2) contacts the outer housing (ROH), and the other side of the spring (Spr2) contacts the inner housing (RIH). As described above, the length of the inner housing (RIH) in the side direction (SD) is shorter than the length of the outer housing (ROH) in the side direction (SD). Thereby, the inner housing (RIH) can reciprocate inside the outer housing (ROH).

[0146] The spring (Spr2) can apply an elastic force to the reciprocating motion of the inner housing (RIH). When the inner housing (RIH) moves and the distance between the roller (R) and the outer housing (ROH) is close, the spring (Spr2) is in a contracted state. This state is the unfolding state described with reference to FIG. 8C.

[0147] When the inner housing (RIH) moves and the distance between the roller (R) and the outer housing (ROH) is far, the spring (Spr2) is in a relaxed state. This state is the folding state described with reference to FIG. 8D.

[0148] On the other hand, in the present disclosure, four spring holders (RSH) and springs (Spr2) are shown as examples, respectively.

[0149] Referring to FIG. 8C, the infolding hinge assembly (IHA) is in the unfolding state. In the unfolding state, the first cover frame (CF1) and the second cover frame (CF2) are arranged so as to form 180° with each other.

[0150] As described above, the outer housing (ROH) is fixed to the cover frames (CF1, CF2). Thereby, in the unfolding state, the outer housing (ROH) is fixed and cannot move in the side direction (SD). The inner housing (RIH) is arranged inside the outer housing (ROH). The inner housing (RIH) can reciprocate in the side direction (SD) inside the outer housing (ROH). The roller (R) is fixed to the inner housing (RIH). Thereby, the roller (R) reciprocates together with the inner housing (RIH). The spring (Spr2) is inserted into the spring holder (RSH). One side of the spring (Spr2) contacts the outer housing (ROH), and the other side contacts the inner housing (RIH). The spring (Spr2) generates a force for the reciprocating motion of the inner housing (RIH).

[0151] When the infolding hinge assembly (IHA) is unfolded, the roller (R) is disposed in the side direction (SD) of the roller stopper (RS) and contacts the roller stopper (RS). Since the roller stopper (RS) is fixed while the roller (R) is movable, the roller (R) moves in the direction of the outer housing (ROH). As a result, the distance (D1) between the roller (R) and the outer housing (ROH) decreases. By the movement of the roller (R), the inner housing (RIH) also moves in the direction of the outer housing (ROH). As a result, the spring (Spr2) contracts. Referring to FIG. 8D, when compared with the distance (D2) described later, the distance (D1) is shorter than the distance (D2).

[0152] When the spring (Spr2) contracts (i.e., is compressed), the spring (Spr2) generates a repulsive force (F1). The repulsive force (F1) is a force that compresses the roller (R) with the roller stopper (RS). By such a repulsive force (F1), the display device (10) can more firmly fix the unfolded state in the unfolded state. Further, the display device (10) can realize a substantially complete flat surface in the unfolded state. Also, the up-down plate (UDP, see FIG. 7A) as described above can be further raised. As a result, the creases that may occur in the folding region (FA, see FIG. 3) can be completely removed.

[0153] Referring to FIG. 8D, the infolding hinge assembly (IHA) is in the folded state. In the folded state, the first cover frame (CF1) and the second cover frame (CF2) are arranged to face each other.

[0154] As described above, the outer housing (ROH) is fixed to the cover frames (CF1, CF2). Thereby, in the folded state, the outer housing (ROH) is fixed and cannot move in the upper direction (UD) and the lower direction (BD). The inner housing (RIH) is disposed within the outer housing (ROH). The inner housing (RIH) can reciprocate in the upper direction (UD) and the lower direction (BD) inside the outer housing (ROH). The roller (R) is fixed to the inner housing (RIH). Thereby, the roller (R) reciprocates together with the inner housing (RIH). The spring (Spr2) is inserted into the spring holder (RSH). One side of the spring (Spr2) contacts the outer housing (ROH), and the other side contacts the inner housing (RIH). The spring (Spr2) generates a force for the reciprocating motion of the inner housing (RIH).

[0155] When the infolding hinge assembly (IHA) is folded, the roller (R) is disposed in the upper direction (UD) of the roller stopper (RS) and does not contact the roller stopper (RS). Thereby, the spring (Spr2) relaxes. When the spring (Spr2) relaxes, the spring (Spr2) moves the inner housing (RIH) in the lower direction (BD). Thereby, the distance (D2) between the outer housing (ROH) and the roller (R) is greater compared to the distance (D1) in the unfolded state.

[0156] FIG. 8E is a front view of a roller stopper (RS) according to an embodiment of the present disclosure. For clarity of explanation, the illustrated components are shown in a further enlarged state compared to other drawings.

[0157] Referring to FIG. 8E, the roller stopper (RS) includes a recess (RS-1) on the upper direction (UD) surface. An up-down plate (UDF-UF, UDP-F) may be disposed in the recess (RS-1). The up-down plate (UDP-UF, UDP-F) can rise in the upper direction (UD) or descend in the lower direction (BD) inside the recess (RS-1). For this purpose, the height of the recess (RS-1) may be formed higher than the height of the up-down plate (UDP-UF, UDP-F).

[0158] In the unfolded state, the up-down plate (UDP-UF) can be positioned relatively high within the recess (RS-1). The upper direction (UD) surface of the up-down plate (UDP-UF) may be substantially the same as the upper direction (UD) surface of the roller stopper (RS).

[0159] In the folded state, the up-down plate (UDP-F) can be positioned relatively low within the recess (RS-1). The upper direction (UD) surface of the up-down plate (UDP-F) may be lower than the upper direction (UD) surface of the roller stopper (RS).

[0160] The roller stopper (RS) includes a convex portion (RS-2) on the lower direction (BD) surface. The convex portion (RS-2) may be, for example, in the shape of a half cylinder. The convex portion (RS-2) may be in a shape corresponding to the hinge cover (HC, see FIG. 4B).

[0161] Also, the hinge cover (HC) includes a fastening hole (CH6, see FIG. 4B), and the roller stopper (RS) may include a fastening hole (CH5, see FIG. 4C). Through the fastening hole (CH5) and the fastening hole (CH6), the hinge cover (HC) and the roller stopper (RS) can be coupled to each other. Specifically, the roller stopper (RS) can be fixed to the hinge cover (HC).

[0162] The roller stopper (RS) includes an inclined portion (RS-3) on the side portion direction (SD) surface. Referring to FIGS. 8C and 8D, as described above, in the folding state, the roller (R) is disposed in the upper direction (UD) of the roller stopper (RS), but in the unfolded state, the roller (R) is disposed in the side portion direction (SD) of the roller stopper (RS). When switching from the folding state to the unfolded state, the roller (R) can move along the inclined portion. Thereby, the natural movement of the roller (R) becomes possible. Conversely, when switching from the unfolded state to the folding state, the natural movement of the roller (R) also becomes possible. Due to the natural movement of the roller (R), smooth switching is possible when switching between the folding state and the unfolded state of the display device (10).

[0163] FIG. 9 is an exploded perspective view of a display device (10) according to another embodiment of the present disclosure.

[0164] The display device (10) shown in FIG. 9 can include a configuration corresponding to the above-described display device (10) with reference to FIG. 3 and the like. Configurations defined by the same terms and configurations indicated by the same reference numerals can be corresponding configurations to each other. When describing other embodiments of the present disclosure, descriptions that overlap with the above description can be omitted within the necessary range.

[0165] In the present disclosure, the direction along the folding axis (A1) along which the display device (10) is folded is defined as the axial direction (AD). The direction from the first display area (DA1) of the display device (10), through the folding area (FA), to the second display area (DA2) is defined as the side portion direction (SD). The direction in which the panel (PNL) of the display device (10) faces is defined as the upper direction (UD). The opposite direction of the upper direction (UD) is defined as the lower direction (BD).

[0166] The top frame (TF) is disposed at the uppermost part in the upper direction (UD) of the display device (10). The top frame (TF) includes a first top frame (TF1) disposed on one side with respect to the folding axis (A1) and a second top frame (TF2) disposed on the other side. The top frame (TF) is disposed to cover the rim of the panel (PNL). The top frame (TF) can protect the panel (PNL) from external impacts. The top frame (TF) can form the bezel of the display device.

[0167] The panel assembly (PNLA) is disposed below the top frame (TF). The panel assembly (PNLA) includes a panel (PNL) and one or more plates (PLT). The panel (PNL) includes a flexible substrate, a circuit element layer disposed on the flexible substrate and including transistors, a light-emitting layer disposed on the circuit element layer and including light-emitting elements, an encapsulation layer disposed on the light-emitting layer, and a touch layer disposed on or inside the encapsulation layer. The panel (PNL) may include a first display area (DA1), a folding area (FA), and a second display area (DA2).

[0168] As illustrated, one end of the panel (PNL) may be bent. Specifically, the panel (PNL) is bent, and the bent portion extends in the lower direction (BD) of at least one plate (PLT). An integrated circuit may be disposed in a chip on glass manner on a portion of the panel (PNL) located below at least one plate (PLT). The integrated circuit may be electrically connected to a printed circuit board via a flat cable (FFC or FPC). The technical idea of the present disclosure is not limited to the chip on glass method. It is also applicable to different methods of similar forms (for example, chip on film) method.

[0169] One or more plates (PLT) may be disposed below the panel (PNL) and include various plates for supporting the panel (PNL). For example, one or more plates may include a back plate for supporting the panel (PNL), a top plate disposed below the back plate and formed of a chassis material, a bottom plate disposed below the top plate, having a pattern formed in the folding portion and formed of a chassis material, a heat dissipation sheet having a heat dissipation function, and a middle plate for covering a plane flattened by various configurations of the hinge assembly.

[0170] The infolding hinge assembly (IHA) is disposed below the folding region (FA). The infolding hinge assembly (IHA) may have a shape that is long along the axial direction (AD). The infolding hinge assembly (IHA) can perform folding and unfolding operations with respect to the folding axis (A1).

[0171] The cover frame (CF) is a frame that covers the side surface and the lower surface of the display device (10). A receiving groove in which the infolding hinge assembly (IHA) can be seated may be formed on the upper surface of the cover frame (CF). The cover frame (CF) includes a first cover frame (CF1) disposed on one side with respect to the folding axis (A1) and a second cover frame (CF2) disposed on the other side. The cover frame (CF) is fastened to the infolding hinge assembly (IHA). As a result, when the folding operation is performed such that the first cover frame (CF1) and the second cover frame (CF2) face each other or the unfolding operation of forming 180° with each other is performed, the infolding hinge assembly (IHA) is folded or unfolded, so that the display device (10) can be folded or unfolded.

[0172] FIG. 10 is a cross-sectional view of a display device (10) according to another embodiment of the present disclosure.

[0173] FIG. 11 is a perspective view of a display device (10) according to another embodiment of the present disclosure. The display device (10) according to another embodiment of the present disclosure will be described with reference to FIGS. 10 and 11. In describing another embodiment of the present disclosure, descriptions overlapping with the above description can be omitted within the necessary range. Also, for clarity of explanation, some components can be illustrated or described with some components deleted. Also, some components can be illustrated or described with some components added within the necessary range.

[0174] Referring to FIG. 10, a cover window (CW) is disposed. The cover window (CW) may be formed of a glass or plastic material. Recent foldable display devices employ a cover window (CW) made of plastic or polyimide material to ensure flexibility. In some cases, ultra-thin glass (UTG) may be used to ensure rigidity and enhance transparency.

[0175] A panel (PNL) is disposed below the cover window (CW). The panel (PNL) may be in a form in which its ends are bent as illustrated. The panel (PNL) may be formed of a flexible material.

[0176] One or more plates (PLT) are disposed below the panel (PNL). The one or more plates (PLT) may include a back plate (BP), a top plate (TPLT), and a bottom plate (BPLT).

[0177] The back plate (BP) may be formed of a relatively rigid material to supplement the rigidity of the flexible panel (PNL). For example, the back plate (BP) may be formed of a plastic material or a metal material.

[0178] The top plate (TPLT) is a plate for supplementing the rigidity of the panel (PNL) along with the foldable characteristics of the display device (10). The top plate (TPLT) may be formed of a plastic or metal material. For example, the top plate (TPLT) may be formed of a SUS material. The SUS material may be a stainless steel material.

[0179] The bottom plate (BPLT) is a plate for supplementing the rigidity of the panel (PNL) along with the foldable characteristics of the display device (10). The bottom plate (BPLT) may be formed of a plastic or metal material. The bottom plate (BPLT) may be formed of a SUS material. The bottom plate (BPLT) may be formed thicker than the top plate (TPLT). To supplement the folding characteristics of the bottom plate (BPLT), the bottom plate (BPLT) may include a slit pattern (PTN) in a portion corresponding to the folding region (FA, see FIG. 9).

[0180] The bottom plate (BPLT) may include a first portion (PT1) and a second portion (PT2). The first portion (PT1) is a portion of the bottom plate (BPLT) having a first height (H1). The second portion (PT2) is a portion of the bottom plate (BPLT) having a second height (H2). The first portion (PT1) and the second portion (PT2) may not be physically separated portions. The first portion (PT1) and the second portion (PT2) can refer to a part of the physically integral bottom plate (BPLT). For example, with respect to a heat dissipation sheet (GST) having an overall first height (H1), a second portion (PT2) having a second height (H2) may be formed by performing a half etching process on a part thereof.

[0181] Due to the height difference between the first portion (PT1) and the second portion (PT2), a housing space (SPC, see FIG. 11) may be formed in the bottom plate (BPLT). A heat dissipation sheet (GST) may be disposed in this housing space (SPC).

[0182] The heat dissipation sheet (GST) may be a sheet that defends against heat diffusion. For example, the heat dissipation sheet may be formed of a material with excellent heat resistance. The heat dissipation sheet (GST) may typically be a graphite sheet formed from a graphite material. As will be described later, the second part (PT2) of the bottom plate (BPLT) may be above the position where the integrated circuit (IC) is disposed. Heat is generated when the integrated circuit (IC) operates. A panel (PNL) is located above the second part (PT2). A large number of transistors and light-emitting elements are arranged on the panel (PNL). Such transistors and light-emitting elements are vulnerable to heat. Therefore, it is necessary to prevent the heat generated in the integrated circuit (IC) from being transmitted to the panel (PNL).

[0183] According to the present disclosure, by disposing the heat dissipation sheet (GST) on the second part (PT2) which is above the integrated circuit (IC), heat heading towards the panel (PNL) can be blocked.

[0184] Also, according to the present disclosure, the heat dissipation sheet (GST) is disposed on the second part (PT2) where a step is generated depending on the height. Thereby, an increase in the thickness of the display device (10) due to the adhesion of the heat dissipation sheet (GST) can be prevented. If the height (H2) of the second part (PT2) were the same as the height (H1) of the first part (PT1), the display device (10) would not have been able to avoid an increase in height due to the adhesion of the heat dissipation sheet (GST).

[0185] An adhesive member (ADH) is disposed below the heat dissipation sheet (GST). The adhesive member (ADH) can serve to adhere the heat dissipation sheet (GST) and the back plate (BP) to each other. The adhesive member (ADH) may be, for example, a foam tape, PSA (Pressure Sensitive Adhesive), but is not limited thereto.

[0186] An integrated circuit (IC) is disposed below the bent portion of the panel (PNL). The integrated circuit (IC) may be formed by a COG (Chip on glass) method. The integrated circuit (IC) may be, for example, a source driver. Or, the integrated circuit (IC) may be a gate driver or a power control circuit unit. The integrated circuit (IC) may be located in the second portion (PT2) of the bottom plate (BPLT).

[0187] A connector (FPC) is disposed below the bent portion of the panel (PNL). One end of the connector (FPC) may be connected to the integrated circuit (IC), and the other end may be connected to a printed circuit board (not shown). Elements such as a timing controller and a memory for driving the display device (10) may be disposed on the printed circuit board.

[0188] Referring to FIG. 11, a bottom plate (BPLT) is shown. The bottom plate (BLPT) may include a first portion (PT1) having a first height (H1) and a second portion (PT2) having a second height (H2). As described above, the second portion (PT2) may be the portion where the integrated circuit (IC) is located. Since the height of the second portion (PT2) is lower than that of the first portion (PT1), an accommodation space (SPC) can be formed in the second portion. A heat dissipation sheet (GST) may be disposed in this accommodation space (SPC).

[0189] FIG. 12 is a cross-sectional view showing a display device (10) according to one embodiment of the present disclosure.

[0190] FIG. 13 is a perspective view showing a display device (10) according to one embodiment of the present disclosure.

[0191] FIG. 14 is a perspective view showing a display device (10) according to one embodiment of the present disclosure.

[0192] Referring to FIGS. 12 to 14, one embodiment of the present disclosure will be described. In describing this embodiment, the same or similar illustrations and the same or similar reference numerals can refer to the same or similar configurations as those in the above-described embodiments. For the sake of clarity of description, some components may be omitted from the illustration or description. For the sake of clarity of description, some components may be added to the illustration or description.

[0193] Referring to FIG. 12, a cover window (CW), a panel (PNL), and one or more plates (PLT) are arranged from an upper direction (UD) to a lower direction (BD). The one or more plates (PLT) may include a back plate (BP), a top plate (TPLT), and a bottom plate (BPLT). The bottom plate (BPLT) may include a slit pattern (PTN) in a portion corresponding to the folding region (FA, see FIG. 9).

[0194] The bottom plate (BPLT) includes a first portion (PT1) and a second portion (PT2). The first portion (PT1) is a portion having a first height (H1), and the second portion (PT2) is a portion having a second height (H2). The second portion (PT2) is a portion where the integrated circuit (IC) is arranged.

[0195] A vertical wall (VW) is arranged in the second portion (PT2). The vertical wall (VW) may have a first height (H1). Thereby, the accommodation space (SPC, see FIGS. 13 and 14) formed in the second portion (PT2) may be divided by the vertical wall (VW).

[0196] As described above, the bottom plate (BPLT) serves to supplement the rigidity to the flexible characteristics of the panel (PNL). According to the present disclosure, the height (H2) of the second part (PT2) is a decreased height compared to the height of the first part (PT1). As a result, the rigidity of the bottom plate (BPLT) may be weakened in the second part (PT2). To compensate for the weakened rigidity, a vertical wall (VW) may be formed in the second part (PT2). The vertical wall (VW) can be formed by omitting the etching process for the portion corresponding to the vertical wall (VW) in the half-etching process as described above.

[0197] A heat dissipation sheet (GST) is disposed in the second part (PT2). Referring to the enlarged portion of the heat dissipation sheet (GST), the heat dissipation sheet (GST) may include a first adhesive surface (GST1), a heat dissipating substance (GST2), and a second adhesive surface (GST3). Specifically, the heat dissipation sheet (GST) includes a plurality of heat dissipation sheets, and each heat dissipation sheet (GST) includes a first adhesive surface (GST1), a heat dissipating substance (GST2), and a second adhesive surface (GST3). The number of the heat dissipation sheets (GST) is the same as the number of the accommodation spaces (SPC) generated by the vertical wall (WV).

[0198] The first adhesive surface (GST1) and the second adhesive surface (GST3) may be adhesive substances. The adhesive substances may include, for example, but are not limited to, foam tape and double-sided tape. The first adhesive surface (GST1) can attach the heat dissipation sheet (GST) to the bottom plate (BPLT). The second adhesive surface (GST3) can attach the heat dissipation sheet (GST) to the adhesive member (ADH).

[0199] The heat dissipating substance (GST2) may be a substance having heat dissipation properties. For example, the heat dissipating substance (GST2) may be a graphite substance. Without being limited thereto, other substances having heat dissipation properties may also be used.

[0200] For example, the heat dissipation material (GST2) may be in a form where the dust is compressed. The compressed dust may break. The first adhesive surface (GST1) and the second adhesive surface (GST3) disposed on the upper and lower portions of the heat dissipation material (GST2) can serve to seal the heat dissipation material (GST2).

[0201] Referring to FIG. 13, the vertical wall (VW) may be formed along the axial direction (AD). Accordingly, a plurality of accommodation spaces (SPC) may be formed in a form having a length in the axial direction (AD). A heat dissipation sheet (GST) may be disposed in each of the plurality of accommodation spaces (SPC). The heat dissipation sheets (GST) may be plural in a form having a length in the axial direction (AD). The heat dissipation sheet (GST) may include a first adhesive surface (GST1), a heat dissipation material (GST2), and a second adhesive surface (GST2).

[0202] Referring to FIG. 14, the vertical wall (VW) may be formed along the axial direction (AD) and the side direction (SD). Accordingly, a plurality of accommodation spaces (SPC) may be formed in a matrix shape. A heat dissipation sheet (GST) may be disposed in each of the plurality of accommodation spaces (SPC). The heat dissipation sheets (GST) may be plural and formed in a matrix shape. The heat dissipation sheet (GST) may include a first adhesive surface (GST1), a heat dissipation material (GST2), and a second adhesive surface (GST3).

[0203] FIG. 15 is a cross-sectional view showing a display device (10) according to another embodiment of the present disclosure.

[0204] FIG. 16 is a perspective view showing a display device (10) according to another embodiment of the present disclosure.

[0205] FIG. 17 is a perspective view showing a display device (10) according to another embodiment of the present disclosure.

[0206] Referring to FIGS. 15 to 17, another embodiment of the present disclosure will be described. In describing this embodiment, the same or similar illustrations and the same or similar reference numerals can refer to the same or similar configurations as those in the above-described embodiments. For the sake of clarity of description, some components may be omitted from the illustration or description. For the sake of clarity of description, some components may be added to the illustration or description.

[0207] Referring to FIG. 15, a cover window (CW), a panel (PNL), and one or more plates (PLT) are arranged in the upper direction (UD) to the lower direction (BD). The one or more plates (PLT) may include a back plate (BP), a top plate (TPLT), and a bottom plate (BPLT). The bottom plate (BPLT) may include a slit pattern (PTN) in a portion corresponding to the folding region (FA, see FIG. 9).

[0208] The bottom plate (BPLT) includes a first portion (PT1) and a second portion (PT2). The first portion (PT1) is a portion having a first height (H1), and the second portion (PT2) is a portion having a second height (H2). The second portion (PT2) is a portion where the integrated circuit (IC) is arranged.

[0209] According to this embodiment, the bottom plate (BPLT) includes a third portion (PT3). The third portion (PT3) is a portion located between the first portion (PT1) and the second portion (PT2) and has a third height (H3). The third height (H3) is lower than the first height (H1) and higher than the second height (H2).

[0210] A vertical wall (VW) is arranged in the second portion (PT2). The vertical wall (VW) may have a first height (H1). Thus, the accommodation space (SPC, see FIGS. 16 and 17) formed in the second portion (PT2) may be divided by the vertical wall (VW).

[0211] According to the embodiment with reference to FIG. 12 etc., the heat dissipation sheet (GST) has a form divided into a plurality. Accordingly, any one heat dissipation sheet (GST) adjacent to another heat dissipation sheet (GST) among the divided ones may have a reduced heat dissipation function therebetween. This embodiment proposes a heat dissipation sheet (GST) connected as one in order to minimize the reduction in functionality of the heat dissipation sheet (GST), which will be described later below.

[0212] The heat dissipation sheet (GST) is disposed in the second part (PT2). Referring to the enlarged part of the heat dissipation sheet (GST), the heat dissipation sheet (GST) may include a first adhesive surface (GST1), a heat dissipation material (GST2), and a second adhesive surface (GST3). Specifically, the second adhesive surface (GST3) is one surface. The heat dissipation material (GST2) may be formed from a plurality of heat dissipation materials in contact with the second adhesive surface (GST3). The first adhesive surface (GST1) may be a plurality of adhesive surfaces in contact with each of the plurality of heat dissipation materials (GST2). The first adhesive surface (GST1) and the second adhesive surface (GST3) may be adhesive substances. The adhesive substance may include, for example, but is not limited to, foam tape, double-sided tape. The first adhesive surface (GST1) can attach the heat dissipation sheet (GST) to the bottom plate (BPLT). The second adhesive surface (GST3) can attach the heat dissipation sheet (GST) to the adhesive member (ADH).

[0213] The second adhesive surface (GST3) may be further adhered to the third part (PT3).

[0214] The heat dissipation material (GST2) may be a material having heat dissipation properties. For example, the heat dissipation material (GST2) may be a graphite material. Without being limited thereto, it may be other materials having heat dissipation properties.

[0215] For example, the heat dissipation material (GST2) may be in a form in which dust is compressed. The compressed dust may break. The first adhesive surface (GST1) and the second adhesive surface (GST3) disposed on the upper and lower portions of the heat dissipation material (GST2) can serve to seal the heat dissipation material (GST2).

[0216] Referring to FIG. 16, the vertical wall (VW) may be formed along the axial direction (AD). As a result, a plurality of accommodation spaces (SPC) may be formed in a form having a length along the axial direction (AD). In the plurality of accommodation spaces (SPC), a first adhesive surface (GST1) and a heat dissipation material (GST2) are disposed. The second adhesive surface (GST3) is disposed so as to cover the second part (PT2) and the third part (PT3).

[0217] According to this embodiment, the heat dissipation sheet (GST) is not in a form divided into a plurality, but is integrated into one. As a result, it is possible to complement the decrease in heat dissipation performance caused by the space between the respective divided heat dissipation sheets (GST).

[0218] Referring to FIG. 17, the vertical wall (VW) may be formed along the axial direction (AD) and the side direction (SD). As a result, a plurality of accommodation spaces (SPC) may be formed in a matrix shape. In each of the plurality of accommodation spaces (SPC), a first adhesive surface (GST1) of the heat dissipation sheet (GST) and a heat dissipation material (GST2) may be disposed. The second adhesive surface (GST3) is formed so as to cover the plurality of heat dissipation materials (GST2). Further, the second adhesive surface (GST3) is disposed so as to cover the second part (PT2) and the third part (PT3).

[0219] As described above, referring to FIGS. 16 and 17, the divided first adhesive surface (GST1) and the heat dissipation material (GST2) of the heat dissipation sheet (GST) are disposed on the second part (PT2) of the bottom plate (BPLT) and are separated by the vertical wall (VW), and the second adhesive surface (GST3) of the heat dissipation sheet (GST) is disposed so as to cover both the second part (PT2) and the third part (PT3) of the bottom plate (BPLT). As a result, it is possible to prevent the decrease in heat dissipation performance caused by the space between the divided heat dissipation sheets (GST).

[0220] According to the present disclosure, a foldable display device is disclosed that includes a panel (PNL) including a first display area, a second display area, and a folding area, and one or more plates (PLT) disposed below the panel, a panel assembly (PNLA); an in-folding hinge assembly (IHA) disposed in the folding area below the panel assembly (PNLA) and including a hinge cover (HC); a first frame cover (CF1) and a second frame cover (CF2) coupled to the in-folding hinge assembly (IHA), and the in-folding hinge assembly (IHA) includes an up-down plate (UDP) having a length in the axial direction.

[0221] The in-folding hinge assembly (IHA) may further include a lift washer (HM-7) including a lift protrusion (LB).

[0222] The lift protrusion (LB) may rotate between a lower direction position and a side direction position.

[0223] When the foldable display device is folded, the lift protrusion (LB) is positioned in the lower direction, and the lift protrusion (LB) can be non-contact with the up-down plate (UDP).

[0224] When the foldable display device is unfolded, the lift protrusion (LB) is positioned in the side direction, and the lift protrusion (LB) can support the up-down plate (UPD).

[0225] The in-folding hinge assembly (IHA) may further include a shaft (HM-12), and the shaft (HM-12) may be disposed to penetrate an opening (OP5) formed in the lift washer (HM-7).

[0226] The shape of the opening (OP5) is a polygonal shape, and the outer peripheral surface of the shaft (HM-12) may be the polygonal shape.

[0227] The infolding hinge assembly (IHA) may further include a shaft bottom (HM-6) disposed in the lower direction of the up-down plate (UDP) and in the upper direction of the hinge cover (HC).

[0228] The up-down plate (UDP) includes fastening holes (CH3) protruding in the lower direction, and the shaft bottom (HM-6) may include fastening holes (CH4) protruding in the upper direction and coupled to the fastening holes (CH3).

[0229] The fastening holes (CH3) may be arranged to penetrate the fastening holes (CH4).

[0230] The infolding hinge assembly (IHA) may further include a fixing screw (SCR) fixed to the fastening holes (CH3) and disposed inside the fastening holes (CH4), and a spring (Spr1) tp having one end fixed to the shaft bottom (HM-6), the other end fixed to the fixing screw (SCR), and disposed inside the fastening holes (CH4).

[0231] When the foldable display device is folded, the spring (Spr1) relaxes, and the spring (Spr1) can lower the up-down plate (UDP).

[0232] The shaft bottom (HM-6) includes fastening holes (CH1), the hinge cover (HC) includes fastening holes (CH2), and the fastening holes (CH1) and the fastening holes (CH2) can be coupled to each other.

[0233] The infolding hinge assembly (IHA) includes a first infolding hinge module (IHM1) and a second infolding hinge module (IHAM) disposed adjacent to each other along the axial direction, and the up-down plate may be coupled to each of the first infolding hinge module (IHM1) and the second infolding hinge module (IHM2).

[0234] The front infolding hinge assembly (IHA) may further include a pair of roller assemblies (RA1, RA2) including rollers and a roller stopper (RS).

[0235] The roller assembly (RA1) can be coupled to the first cover frame (CF1) via a fastening hole (CH7), and the roller assembly (RA2) can be coupled to the second cover frame (CF2) via a fastening hole (CH8).

[0236] The roller stopper (RS) includes a fastening hole (CH5), the hinge cover (HC) includes a fastening hole (CH6), and the fastening hole (CH5) and the fastening hole (CH6) can be coupled to each other.

[0237] The roller assemblies (RA1, RA2) may include an outer housing (ROH); an inner housing (RIH) inserted into the outer housing (ROH); a spring holder (RSH) formed integrally with the inner housing (RIH); and a spring (Spr2) inserted into the spring holder (RSH).

[0238] The length of the inner housing (RIH) in the side direction may be shorter than the length of the outer housing (ROH) in the side direction.

[0239] One side of the spring (Spr2) can contact the outer housing (ROH), and the other side of the spring (Spr2) can contact the inner housing (RIH).

[0240] The spring (Spr2) may have a length in the side direction.

[0241] When the foldable display device is unfolded, the roller may be disposed in the side direction of the roller stopper (RS).

[0242] The spring (Spr2) contracts, and the spring (Spr2) can generate a force that causes the roller to be in close contact with the roller stopper (RS).

[0243] When the foldable display device is folded, the roller may be disposed in the upper direction of the roller stopper (RS).

[0244] The spring (Spr2) may also relax.

[0245] The distance (D1) between the roller and the roller stopper (RS) when the foldable display device is unfolded may be shorter than the distance (D2) between the roller and the roller stopper when the foldable display device is folded.

[0246] The roller stopper (RS) includes a recess (RS-1) on the upper surface, and the up-down plate (UDP) may be disposed within the recess (RS-1).

[0247] The height of the recess (RS-1) may be formed higher than the height of the up-down plate (UDP).

[0248] When the foldable display device is unfolded, the up-down plate (UDP) is relatively high within the recess (RS-1), and when the foldable display device is folded, the up-down plate (UDP) may be relatively low within the recess (RS-1).

[0249] The roller stopper (RS) may include an inclined portion (RS-3) on the side surface.

[0250] The front infolding hinge assembly (IHA) includes a first infolding hinge module (IHM1) and a second infolding hinge module (IHM2) that are arranged adjacent to each other along the axial direction, and the roller stopper (RS) may be arranged between the first infolding hinge module (IHM1) and the second infolding hinge module (IHM2).

[0251] According to the present disclosure, a panel assembly including a first display area, a second display area, and a folding area, and one or more plates disposed below the panel; an infolding hinge assembly disposed in the folding area below the panel assembly and including a hinge cover; and a first cover frame and a second cover frame coupled to the infolding hinge assembly are disclosed. The one or more plates include a bottom plate, and the bottom plate includes a first portion having a first height and a second portion having a second height lower than the first height. A foldable display device is disclosed.

[0252] The bottom plate may be formed of a SUS material.

[0253] The bottom plate may include a slit pattern corresponding to the folding area.

[0254] An integrated circuit may be disposed below the second portion.

[0255] It may further include a heat dissipation sheet disposed in a receiving space formed in the second portion.

[0256] The heat dissipation sheet may include a graphite material.

[0257] The heat dissipation sheet may include a first adhesive surface, a heat dissipation material, and a second adhesive surface.

[0258] The bottom plate may further include a vertical wall formed in the second portion.

[0259] The vertical wall may be formed along the axial direction.

[0260] The vertical wall may be formed along the axial direction and the side direction.

[0261] The bottom plate may further include a third portion formed between the first portion and the second portion and having a third height lower than the first height and higher than the second height.

[0262] It may further include a receiving space formed in the second portion and a heat dissipation sheet disposed in the third portion.

[0263] The heat dissipation sheet may include a plurality of first adhesive surfaces, a plurality of heat dissipation substances, and a second adhesive surface attached to the plurality of heat dissipation substances.

[0264] A plurality of the second adhesive surfaces are formed, and each of the second adhesive surfaces may be attached to each of the plurality of heat dissipation substances.

[0265] The second adhesive surface is integrally formed, and the plurality of heat dissipation substances may be attached to the integral second adhesive surface.

[0266] The infolding hinge assembly may further include an up-down plate having a length in the axial direction.

[0267] The infolding hinge assembly may further include a lift washer including a lift protrusion.

[0268] The lift protrusion may rotate between a lower direction position and a side direction position.

[0269] When the foldable display device is folded, the lift protrusion is positioned in the downward direction, and the lift protrusion can be non-contact with the up-down plate.

[0270] When the foldable display device is unfolded, the lift protrusion is positioned in the side direction, and the lift protrusion can support the up-down plate.

[0271] The above description and the accompanying drawings are merely illustrative of the technical idea of the present disclosure. For those with ordinary knowledge in the technical field to which the present disclosure pertains, various modifications or deformations such as combinations, separations, substitutions, and changes in the configuration are possible without departing from the essential characteristics of the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are not for limiting the technical idea of the present disclosure but for explaining it, and the scope of the technical idea of the present disclosure is not limited by such embodiments. The protection scope of the present disclosure should be interpreted according to the following claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present disclosure.

[0272] In the foldable display device of the present disclosure, it will be apparent to those skilled in the art that various modifications and deformations are possible without departing from the technical idea or scope of the present disclosure. Therefore, it should be understood that the present disclosure includes modifications and deformations of the present disclosure as long as they are within the scope of the appended claims and their equivalents.

Explanation of Reference Numerals

[0273] 10: Display device PNL: Panel PLT: One or more plates TF: Top frame BPLT: Bottom plate PT1: First part PT2: Second part GST: Heat dissipation sheet

Claims

1. A panel that is folded along a folding axis and includes a first display area, a second display area, and a bending area that is bent in a direction perpendicular to the folding axis; One or more plates disposed under the panel; A first cover frame and a second cover frame disposed under the panel and the one or more plates; An infolding hinge assembly disposed between the first cover frame and the second cover frame and including a hinge cover having a length along the folding axis direction and a plurality of infolding hinge modules; The hinge cover includes an accommodation space in which the plurality of infolding hinge modules are disposed; The plurality of infolding hinge modules are respectively coupled to the hinge cover, the first cover frame, and the second cover frame, and is a foldable display device.

2. The one or more plates include a bottom plate including a slit pattern; The panel is bent in the bending area, extends under the one or more plates, and at least a part of the panel is disposed under the one or more plates. The foldable display device according to claim 1.

3. The foldable display device according to claim 2, further including a heat dissipation sheet and an adhesive member disposed between the bottom plate and the lower surface of the bent panel.

4. The foldable display device according to claim 3, further including an integrated circuit disposed under the bent portion of the panel.

5. The plurality of infolding hinge modules include a first infolding hinge module (IHM3) and a second infolding hinge module (IHM4) disposed along the axial direction; The first infolding hinge module (IHM3) and the second infolding hinge module (IHM4) are symmetric with respect to the axial direction. The foldable display device according to claim 1.

6. Each of the first infolding hinge module and the second infolding hinge module includes a lever wing and a wing guide disposed on one side or the other side of the lever wing in the axial direction. The wing guides of the first infolding hinge module and the wing guides of the second infolding hinge module face each other, the foldable display device according to claim 5.

7. The infolding hinge module includes a pair of shafts and a lift washer guide having an opening, Through the opening, the shaft is disposed through the lift washer guide, the foldable display device according to claim 5.

8. The infolding hinge module further includes a plurality of disc springs and a shaft bottom having fastening holes disposed between the disc springs, the foldable display device according to claim 7.

9. The shaft bottom is coupled to the hinge cover by the fastening holes, the foldable display device according to claim 8.

10. The infolding hinge module further includes a pair of plate-like lever wings that are wider than the width of the hinge cover and are coupled to the first cover frame and the second cover frame, the foldable display device according to claim 7.

11. The infolding hinge module further includes a plurality of gears disposed between the lever wing and the lift washer guide, the foldable display device according to claim 10.

12. Further including a heat dissipation sheet disposed on the one or more plates, The one or more plates include a bottom plate, The bottom plate includes a first portion having a first height and a second portion having a second height lower than the first height, Including the heat dissipation sheet disposed in a receiving space formed in the second portion, The panel is bent along the axial direction, and the bent portion extends in a lower direction of the at least one plate, Including an integrated circuit disposed on the bent portion of the panel, The second portion of the bottom plate extends along the axial direction and overlaps the integrated circuit, the foldable display device according to claim 11.

13. The integrated circuit is disposed below the second portion, the foldable display device according to claim 12.

14. The heat dissipation sheet includes a first adhesive surface, a heat dissipation material, and a second adhesive surface, the foldable display device according to claim 12.

15. The bottom plate further includes a vertical wall formed in the second portion, the foldable display device according to claim 12.

16. The bottom plate further includes a third portion formed between the first portion and the second portion and having a third height lower than the first height and higher than the second height, the foldable display device according to claim 12.

17. The accommodation space is formed in the second portion, and the heat dissipation sheet is disposed in the third portion, the foldable display device according to claim 16.

18. The heat dissipation sheet includes a plurality of first adhesive surfaces, a plurality of heat dissipation substances, and a second adhesive surface attached to the plurality of heat dissipation substances, the foldable display device according to claim 17.

19. A plurality of the second adhesive surfaces are formed, and each of the second adhesive surfaces is attached to each of the plurality of heat dissipation substances, the foldable display device according to claim 18.

20. The second adhesive surface is integrally formed, and the plurality of heat dissipation substances are attached to the integral second adhesive surface, the foldable display device according to claim 18.

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