Electronic device having draw-out-motion-converting width-direction tensioning structure and rear support structure for flexible display panel

Abstract

The present invention relates to an electronic device comprising a flexible display panel. The electronic device comprises a housing having an internal receiving space, a flexible display panel in which the area of ​​the exposed display region expands as it is withdrawn from the housing, a back support structure that is withdrawn in conjunction with the withdrawal of the flexible display panel and supports the back of the middle region of the withdrawn display region, a pair of edge tension members coupled to both edge portions in the width direction of the flexible display panel, and a motion conversion mechanism that converts linear motion in the withdrawal direction occurring in conjunction with the withdrawal of the flexible display panel into motion in the width direction by increasing the gap between the pair of edge tension members. A tensile force in the width direction is applied to the withdrawn display region by increasing the gap between the pair of edge tension members, and the back support structure maintains back support for the middle region of the withdrawn display region while the tensile force in the width direction is applied. Accordingly, sagging of the central part of the flexible display panel, wrinkling in the width direction, edge curling, and lifting from the back support structure can be suppressed without using a separate driving source for tension.

Description

Technology Field

[0001] The present invention relates to an electronic device including a flexible display panel, and more specifically, to an electronic device capable of applying a tensile force in the width direction to the extended display area of ​​a flexible display panel without using a separate driving source for tension by withdrawing a back support structure in conjunction with the operation of withdrawing a flexible display panel from a housing, and converting the linear motion in the withdrawal direction generated by the withdrawal operation into a motion that moves the two edges of the flexible display panel in the width direction away from each other.

[0002] The present invention relates to a structure capable of suppressing wrinkles, edge curling, lifting of the center, and indentation caused by touch load of a flexible display panel by supporting an intermediate area located between the two edges in the width direction of the flexible display panel with a back support structure and applying a tensile force in the width direction to the two edges of the flexible display panel.

[0003] The electronic device according to the present invention can be applied to smartphones, tablet computers, laptop computers, portable information terminals, monitors, televisions, automotive display devices, digital signage, electronic whiteboards, and various electronic devices that require a variable display area. Background Technology

[0004] A flexible display panel is a display panel in which display elements are formed on a flexible substrate, allowing for bending, winding, folding, or curved deformation. By housing a portion of the flexible display panel inside the housing of an electronic device and pulling it out as needed, the area of ​​the display surface available to the user can be expanded while maintaining the portability of the electronic device.

[0005] In a rollable or slideable display device, a flexible display panel can be wound onto a storage roller or stored along a curved path inside a housing, and the display area can be changed by moving the leading edge or leading frame of the flexible display panel.

[0006] Since the flexible display panel itself has difficulty having sufficient bending rigidity, a support plate, support slat, multi-joint backplate, or telescopic support structure may be placed on the back of the area drawn out outside the housing. The back support structure can prevent the flexible display panel from deforming excessively in the thickness direction when a touch input or pressing load is applied to the flexible display panel.

[0007] However, it is difficult to sufficiently resolve wrinkles, wavy deformation, edge curling, and tension imbalance in the width direction that occur in the width direction of the flexible display panel by only supporting the flexible display panel from below with a rear support structure.

[0008] In particular, if a flexible display panel is kept wound on a storage roller for a long time, residual deformation due to the winding curvature may form. Even after the flexible display panel is withdrawn, due to this residual deformation, the central part of the flexible display panel may lift away from the back support structure or the edges on both sides may curl upward.

[0009] If a gap is formed between the flexible display panel and the back support structure, when a user touches the flexible display panel, the flexible display panel may first sink toward the back support structure and then be supported. This phenomenon can destabilize the touch operation feel and cause fatigue in the display element layer, encapsulation layer, touch sensing layer, or adhesive layer of the flexible display panel due to repetitive local deformation.

[0010] Although a structure can be used in which the two edges of the flexible display panel are pulled by separate actuators, adding separate tension motors, reduction gears, sensors, control circuits, and locking devices may increase the thickness of the electronic device, the number of parts, power consumption, and manufacturing costs.

[0011] In addition, if the tension in the width direction is configured to continuously increase throughout the entire drawing process of the flexible display panel, the drawing resistance of the flexible display panel increases and excessive stress may be concentrated at the edges of the flexible display panel. If the flexible display panel is wound onto a storage roller while under tension in the width direction, there is also a possibility that the edges, wiring, or encapsulation layer of the flexible display panel may be damaged.

[0012] Therefore, a structure is required that effectively does not apply or keeps low widthwise tension during the withdrawal process of the flexible display panel, applies widthwise tension only after the flexible display panel and the back support structure have reached a set withdrawal position, and can automatically release the widthwise tension before the retraction of the flexible display panel begins.

[0013] In addition, a thin mechanical structure is required that can obtain the driving force necessary for applying widthwise tension from the pulling motion of the flexible display panel itself, thereby omitting a separate driving source for tension, and provide back support for the middle area of ​​the flexible display panel and widthwise tension for both edges. The problem to be solved

[0014] One objective of the present invention is to provide an electronic device capable of applying a tensile force in the width direction to a pulled-out display area without using a separate driving source for tension by increasing the gap between the two edges in the width direction of the flexible display panel using the linear motion generated by the pulling operation of the flexible display panel.

[0015] Another objective of the present invention is to support the middle area of ​​the display area drawn out with a back support structure drawn out together with the flexible display panel, while pulling both edges of the flexible display panel outward in the width direction to suppress both central sagging and width-direction wrinkling.

[0016] Another objective of the present invention is to prevent the flexible display panel from lifting off the back support structure by allowing the edges of both sides of the flexible display panel to move in the drawing direction while restricting them from deviating in the width and thickness directions.

[0017] Another objective of the present invention is to absorb fine gaps and assembly tolerances between the back support structure and the flexible display panel by preloading an elastic support layer to the back surface of the middle region of the flexible display panel.

[0018] Another objective of the present invention is to mechanically implement a sequential operation in which a widthwise tension is applied after the flexible display panel and the back support structure are withdrawn to a set support position, and the widthwise tension is released before the storage of the flexible display panel begins.

[0019] Another objective of the present invention is to convert a relatively large amount of movement in the drawing direction into a small amount of movement in the width direction, thereby securing a width direction tensile force of the required size without causing excessive width direction deformation in the flexible display panel.

[0020] Another objective of the present invention is to suppress changes in the width direction center position of a flexible display panel by substantially symmetrically shifting a pair of edge tension members in opposite width directions.

[0021] Another objective of the present invention is to suppress breakage or edge damage of a flexible display panel by limiting the maximum widthwise movement and elastically absorbing excessive widthwise tensile force.

[0022] The problem that the present invention aims to solve is not limited to the aforementioned problem, and may include other problems that a person skilled in the art can recognize from the configuration and effects described below. means of solving the problem

[0023] An electronic device according to one embodiment of the present invention may include a housing, a flexible display panel, a back support structure, a pair of edge tension members, and a motion conversion mechanism.

[0024] A receiving space may be formed inside the housing to accommodate at least a portion of the flexible display panel and at least a portion of the rear support structure.

[0025] The flexible display panel can be housed in a receiving space in at least a portion, and as it is pulled out from the housing in a pulling direction, the area of ​​the display region exposed outside the housing can be expanded.

[0026] The back support structure can be stored in a receiving space and can be withdrawn from the housing in conjunction with the withdrawal of the flexible display panel. The back support structure can support the back of an intermediate area located between the two edges in the width direction of the withdrawn display area of ​​the flexible display panel.

[0027] A pair of edge tension members can be combined to transmit a force in the width direction to each of the two edge portions in the width direction of the flexible display panel.

[0028] The motion conversion mechanism can convert linear motion in the withdrawal direction, which occurs in conjunction with the withdrawal of the flexible display panel, into motion in the width direction that increases the gap between a pair of edge tension members.

[0029] Tensile force along the width direction can be applied to the drawn-out display area of ​​the flexible display panel by increasing the gap between a pair of edge tension members. The back support structure can maintain support for the back of the middle area of ​​the flexible display panel even while tensile force along the width direction is applied.

[0030] The rear support structure may include at least one rear support plate that is housed in the housing space along a straight movement path that is distinct from the path in which the flexible display panel is housed in the housing space.

[0031] The back support plate may be formed as a single support plate, or it may include a plurality of support plates that overlap so as to be movable relative to each other in the withdrawal direction. The plurality of support plates may be sequentially deployed in conjunction with the withdrawal of the flexible display panel.

[0032] An elastic support layer may be disposed on the upper surface of the back support plate. The elastic support layer may elastically contact the back surface of the middle region of the flexible display panel while the two edge portions of the flexible display panel are held by a pair of edge tension members.

[0033] A pair of edge tension members may include a pair of edge tension rails that are positioned on both sides in the width direction of the rear support structure and are guided to move in the width direction relative to the rear support structure.

[0034] A pair of edge tension rails may each have retaining grooves formed therein to accommodate the edge portions on both sides of the flexible display panel. The retaining grooves allow the edge portions of the flexible display panel to move in the pulling direction and can restrict them from deviating in the width direction and the thickness direction of the flexible display panel.

[0035] A pair of reinforcing members capable of being wound or bent together with the flexible display panel may be formed on each of the two edge portions in the width direction of the flexible display panel. The reinforcing members may be received in a retaining groove and receive a force in the width direction from the edge tension rail.

[0036] An entry / exit guide may be provided in the exit port of the housing to sequentially introduce the reinforcing member into the retaining groove as the flexible display panel is withdrawn, and sequentially remove the reinforcing member from the retaining groove as the flexible display panel is stored.

[0037] The motion conversion mechanism may include a linear-rotational conversion unit that converts the linear motion in the withdrawal direction of a rear support structure into rotational motion, and a rotational-linear conversion unit that converts the rotational motion into linear motion in opposite width directions of a pair of edge tension members.

[0038] The linear-rotational converter may include an input rack fixed to the housing and extending in the withdrawal direction, and an input pinion rotatably supported on a rear support structure and engaged with the input rack.

[0039] The rotary-linear conversion unit may include an output pinion connected coaxially with an input pinion, a first output rack engaged on one side of the output pinion, and a second output rack engaged on the output pinion on the opposite side of the first output rack with the output pinion in between.

[0040] The first output rack and the second output rack are each connected to a pair of edge tension members and can move in opposite width directions according to the rotation of the output pinion.

[0041] The pitch diameter of the output pinion can be formed to be smaller than the pitch diameter of the input pinion. Accordingly, a relatively large amount of movement in the pull-out direction of the back support structure can be reduced and converted into a relatively small amount of movement in the width direction of a pair of edge tension members.

[0042] The input rack may include a free-moving section that does not transmit rotational force to the input pinion, and a tension-generating section formed with teeth that mesh with the input pinion. The tension-generating section may be positioned at the exit end of the rear support structure relative to the free-moving section.

[0043] The motion conversion mechanism may include a delay coupling member that limits the increase in the gap between a pair of edge tension members until the back support structure reaches a set support position that supports the middle area of ​​the flexible display panel, and initiates the increase in the gap after the back support structure reaches the set support position.

[0044] The delay coupling portion may include at least one of a clearance portion, an elongated hole coupling portion, an optional engagement portion, and a clutch.

[0045] Each of the pair of edge tension members may include an integral tension transfer bar extending in the withdrawal direction. The first output rack and the second output rack are each connected to the integral tension transfer bar to transmit widthwise movement over the length of the withdrawal direction of the withdrawn display area of ​​the flexible display panel.

[0046] The first output rack and the second output rack can each be coupled to a pair of linear guides. The first output rack and the second output rack can move by substantially the same amount in opposite width directions.

[0047] The motion conversion mechanism may be provided with a stopper that limits the maximum gap between a pair of edge tension members and a locking part that maintains a state in which a tensile force in the width direction is applied.

[0048] An elastic connection may be placed between the output rack and the edge tension member. The elastic connection can elastically deform when the widthwise tensile force applied to the flexible display panel exceeds a set limit, thereby absorbing additional outward movement of the edge tension member.

[0049] In another embodiment, the motion conversion mechanism may include a pair of inclined guide sections that extend along the withdrawal direction and are inclined outward in the width direction, and a pair of driven members each connected to a pair of edge tension members and moving along the inclined guide sections.

[0050] In another embodiment, the motion conversion mechanism may include a rotation axis that rotates in conjunction with the withdrawal direction movement of the back support structure, a first screw portion and a second screw portion formed in opposite spiral directions on the rotation axis, and a first moving nut and a second moving nut respectively coupled to the first screw portion and the second screw portion.

[0051] The motion conversion mechanism can receive a driving force to move a pair of edge tension members from the relative linear movement in the withdrawal direction between the back support structure and the housing. Effects of the invention

[0052] According to the present invention, since linear motion generated in conjunction with the drawing of a flexible display panel is converted into motion for applying tension in the width direction, a tensile force in the width direction can be applied to the drawn-out display area without using a separate tension motor or actuator.

[0053] According to the present invention, the middle region of the flexible display panel is supported by a back support structure, and the edges on both sides of the flexible display panel are pulled outward in the width direction by edge tension members, so that central sagging, width direction wrinkling, wavy deformation, and edge curling can be suppressed together.

[0054] According to the present invention, since the edges on both sides of the flexible display panel are allowed to move in the drawing direction while deviation in the width and thickness directions is restricted, the flexible display panel can be prevented from lifting upward from the back support structure.

[0055] According to the present invention, since the elastic support layer of the back support plate is in preload contact with the back surface of the middle region of the flexible display panel, it can absorb fine gaps, height deviations, and assembly tolerances between the flexible display panel and the back support structure.

[0056] Accordingly, when a user touches the flexible display panel, the phenomenon where the flexible display panel sinks down first and is then supported can be reduced, and a stable touch operation sensation can be provided.

[0057] According to the present invention, motion transmission for applying width-direction tension is restricted in the free movement section, and the gap between a pair of edge tension members is increased only in the tension generation section, so the pull-out resistance of the flexible display panel can be reduced.

[0058] According to the present invention, since width-direction tension is applied after the flexible display panel and the back support structure reach a set support position, it is possible to prevent width-direction tensile force from being applied to the flexible display panel when the back is not sufficiently supported.

[0059] According to the present invention, during the storage process of a flexible display panel, the edge tension member returns inward in the width direction to release the width direction tension, and then the back support structure and the flexible display panel are stored, thereby preventing the flexible display panel that is tensioned in the width direction from being wound onto the storage roller.

[0060] According to the present invention, by adjusting the pitch diameter ratio of the input pinion and the output pinion, a large amount of movement in the extraction direction can be converted into a small amount of movement in the width direction, thereby allowing for precise setting of the tensile force in the width direction and the displacement in the width direction.

[0061] According to the present invention, since the first output rack and the second output rack move by substantially the same amount in opposite width directions, the change in the width direction center position of the flexible display panel can be suppressed.

[0062] According to the present invention, since the stopper limits the maximum gap between a pair of edge tension members and the elastic connection absorbs excessive tension, it is possible to suppress the concentration of excessive stress on the edges, wiring, encapsulation layer, and adhesive layer of the flexible display panel.

[0063] According to the present invention, since the back support structure, the edge tension member, and the motion conversion mechanism can be arranged in a thin mechanical structure, it can be applied to electronic devices having limited internal space, such as smartphones. Brief explanation of the drawing

[0064] FIG. 1 is a partially cutaway perspective view illustrating a state in which a flexible display panel and a back support structure are withdrawn from a housing in an electronic device according to one embodiment. FIG. 2 is a cross-sectional view illustrating a state in which a flexible display panel and a rear support structure according to one embodiment are housed inside a housing. FIG. 3 is a cross-sectional view illustrating a flexible display panel and a rear support structure withdrawn from a housing according to one embodiment. FIG. 4 is a planar operation diagram illustrating a comparison between the state before withdrawal and the state of applying tension in the width direction of a flexible display panel according to one embodiment. FIG. 5 is an exploded perspective view illustrating a specific mechanical structure of a rear support structure according to one embodiment. FIG. 6 is a cross-sectional view illustrating the coupling relationship between a flexible display panel, a back support plate, an elastic support layer, and a pair of edge tension members according to one embodiment. FIG. 7 is a partially enlarged cross-sectional view illustrating the connection relationship between an edge tension rail, a retaining groove, and a reinforcing part of a flexible display panel according to one embodiment. FIG. 8 is a partial cutaway diagram illustrating the structure and operation of an entry / exit guide placed at the outlet of a housing according to one embodiment. FIG. 9 is a mechanical structural plan view illustrating a motion conversion mechanism that converts the linear motion in the pulling direction of a rear support structure according to one embodiment into the linear motion in the width direction opposite to each other of a pair of edge tension members. FIG. 10 is a partially enlarged cross-sectional view illustrating the specific meshing relationship of an input pinion, an output pinion, a common rotation axis, and an output rack according to one embodiment. FIG. 11 is an operating state diagram illustrating the free movement section and the tension generation section of an input rack according to one embodiment. FIG. 12 is an operation diagram illustrating the structure and sequential operation of a delay coupling part that allows width direction tension to be applied after the support of a rear support structure according to one embodiment is formed. FIG. 13 is an exploded perspective view and a partial enlarged view illustrating a structure for guiding movement, transmitting tension, maintaining tension, and preventing excessive tension of a pair of edge tension members according to one embodiment. FIG. 14 is a planar operational diagram illustrating an inclined guide type motion conversion mechanism according to another embodiment. FIG. 15 is a partially cutaway perspective view illustrating a counter-screw type motion conversion mechanism according to another embodiment. Specific details for implementing the invention

[0065] Embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the technical concept of the present invention is not limited to the following embodiments, and a person skilled in the art may modify, substitute, or combine parts of the configuration within the scope of the technical concept of the present invention without departing from it.

[0066] Identical or substantially identical components throughout the drawing may be assigned the same reference numeral. If it is necessary to distinguish multiple identical components, letters, left / right distinctions, or sub-numbers may be added to the reference numerals.

[0067] In this specification, the expression that one component is “connected,” “coupled,” “supported,” or “interlocked” with another component may include not only direct connection, coupling, support, or interlocking, but also indirect connection, coupling, support, or interlocking through one or more intermediate components.

[0068] In this specification, "drawing direction (D1)" may refer to the main direction in which the flexible display panel (120), the back support structure (130), or the moving member connected thereto move when the external exposure area of ​​the flexible display panel (120) increases.

[0069] "Width direction (D2)" may mean a direction that extends along the display surface of the flexible display panel (120) and intersects the withdrawal direction (D1). The width direction (D2) is not limited to a direction exactly perpendicular to the withdrawal direction (D1), but may include a direction having a directional component that intersects the withdrawal direction (D1) and connects the two edges of the flexible display panel (120).

[0070] "Thickness direction (D3)" may mean the direction connecting the front and back surfaces of the flexible display panel (120).

[0071] "The drawn-out display area (121)" may mean all or part of the area of ​​the flexible display panel (120) that is exposed to the outside of the housing (110) and contributes to the expansion of the display area.

[0072] "Width-direction tensile force (TW)" may refer to a force acting to keep the flexible display panel (120) taut along the width direction (D2) of the flexible display panel (120). The width-direction tensile force (TW) may be distributed uniformly over the entire flexible display panel (120), or it may be distributed differently depending on the material properties, shape, and edge bonding structure of the flexible display panel (120).

[0073] Overall configuration of the electronic device

[0074] Referring to FIGS. 1 to 4, an electronic device (100) according to one embodiment may include a housing (110), a flexible display panel (120), a back support structure (130), a pair of edge tension members (141, 142), and a motion conversion mechanism (150).

[0075] The housing (110) can form the exterior of the electronic device (100). A receiving space (111) can be formed inside the housing (110).

[0076] In the receiving space (111), a stored area (122) of a flexible display panel (120), at least a part of a rear support structure (130), a motion conversion mechanism (150), and a driving circuit of an electronic device (100) may be placed.

[0077] An outlet (112) through which a flexible display panel (120) and a back support structure (130) pass may be formed on one side of the housing (110). The flexible display panel (120) and the back support structure (130) may pass through a single common outlet or through separate outlet paths.

[0078] The housing (110) may include a storage path (113) for a flexible display panel (120) and a storage path (114) for a rear support structure (130).

[0079] The storage path (113) of the flexible display panel (120) may be a path where the flexible display panel (120) is wound onto a storage roller (115), a path where it bends along one or more guide rollers, or a path that overlaps inside the housing (110).

[0080] The storage path (114) of the rear support structure (130) may be a straight or telescopic storage path distinct from the storage path (113) of the flexible display panel (120).

[0081] The flexible display panel (120) may include a front surface (123) and a back surface (124). An image may be displayed on the front surface (123), and the back surface (124) may be supported by a back surface support structure (130).

[0082] The flexible display panel (120) may be an organic light-emitting display panel, an inorganic light-emitting display panel, a micro light-emitting diode display panel, an electrophoretic display panel, or other types of flexible display panels.

[0083] The flexible display panel (120) may include at least some of a flexible substrate, a thin film transistor layer, a display element layer, an encapsulation layer, a touch sensing layer, a polarizing layer, a cover layer, an optical film, and a back protection layer.

[0084] A flexible display panel (120) may include an active area (125) and an inactive area (126). A plurality of display pixels may be arranged in the active area (125). The inactive area (126) may be arranged on both sides in the width direction of the active area (125) and may include signal wiring, encapsulation clearance, or reinforcement (127).

[0085] A front end frame (129) may be attached to the front end of the flexible display panel (120). When a user pulls out the front end frame (129) or the panel driving unit of the electronic device (100) moves the front end frame (129), the area of ​​the pulled-out display area (121) of the flexible display panel (120) may be increased.

[0086] The back support structure (130) can move in the withdrawal direction (D1) in conjunction with the withdrawal of the flexible display panel (120).

[0087] The back support structure (130) can support the back (124) of the middle area located between the two sides in the width direction of the drawn-out display area (121) of the flexible display panel (120).

[0088] The back support structure (130) may have a width smaller than the total width of the flexible display panel (120) and may substantially continuously support the middle area excluding the edge portion of the flexible display panel (120).

[0089] A pair of edge tension members (141, 142) may include a first edge tension member (141) and a second edge tension member (142).

[0090] The first edge tension member (141) can be coupled to one edge portion in the width direction of the flexible display panel (120), and the second edge tension member (142) can be coupled to the other edge portion in the width direction of the flexible display panel (120).

[0091] The motion conversion mechanism (150) can receive driving force from the movement of the flexible display panel (120) or the back support structure (130) in the withdrawal direction (D1).

[0092] The motion conversion mechanism (150) can convert linear motion in the withdrawal direction (D1) into movement in the width direction (D2) where the first edge tension member (141) and the second edge tension member (142) move away from each other.

[0093] When the gap between the first edge tension member (141) and the second edge tension member (142) increases, the two edge portions of the flexible display panel (120) are pulled outward in the width direction, and a width direction tensile force (TW) can be applied to the pulled-out display area (121).

[0094] The back support structure (130) can maintain back support for the middle area of ​​the flexible display panel (120) even while the first edge tension member (141) and the second edge tension member (142) move outward in the width direction.

[0095] Rear support structure

[0096] Referring to FIGS. 2, FIGS. 3 and FIGS. 5, the back support structure (130) may include at least one back support plate (131).

[0097] The back support plate (131) can be formed from a thin metal plate, a synthetic resin plate, a fiber-reinforced composite plate, a honeycomb structure plate, a sandwich structure plate, or a combination thereof.

[0098] The back support plate (131) can be formed with a small thickness for thinning the electronic device (100) while having sufficient thickness direction rigidity to support the middle area of ​​the flexible display panel (120).

[0099] The back support plate (131) can be formed as a single plate. The single back support plate (131) has a length corresponding to the amount of the flexible display panel (120) drawn out and can move linearly inside the housing (110).

[0100] In another embodiment, the back support structure (130) may include a plurality of support plates, including a first support plate (131a), a second support plate (131b), and a third support plate (131c).

[0101] Multiple support plates (131a, 131b, 131c) can be overlapped so as to be moved relative to each other in the withdrawal direction (D1). Multiple support plates can be sequentially withdrawn and stored in a telescopic manner.

[0102] The first support plate (131a) may be fixed to the housing (110) or positioned closest to the housing (110). The second support plate (131b) may move in the withdrawal direction (D1) relative to the first support plate (131a). The third support plate (131c) may move in the withdrawal direction (D1) relative to the second support plate (131b).

[0103] Support guide rails (132) and guide blocks (133) may be arranged between adjacent support plates. The support guide rails (132) and guide blocks (133) may guide the movement of multiple support plates in the withdrawal direction (D1) and limit the clearance in the thickness direction (D3).

[0104] A stopper (134) may be placed at the withdrawal end of each support plate. The stopper (134) may limit the maximum relative movement between adjacent support plates and prevent multiple support plates from separating from each other.

[0105] Multiple support plates can be sequentially deployed in conjunction with the withdrawal of the flexible display panel (120). For example, the movement of the leading frame (129) is transmitted to the third support plate (131c), and after the third support plate (131c) moves a set distance, it pulls the second support plate (131b), and after the second support plate (131b) moves a set distance, it can complete the relative movement with respect to the first support plate (131a).

[0106] When storing, multiple support plates can be overlapped in the reverse order of the above process.

[0107] An elastic support layer (135) may be placed on the upper surface of the back support plate (131).

[0108] The elastic support layer (135) can be formed from silicone, urethane, elastomer, foamed elastomer, elastic adhesive tape, or flexible composite material.

[0109] The elastic support layer (135) may protrude slightly toward the back surface (124) of the flexible display panel (120). The elastic support layer (135) may come into contact with the back surface (124) of the middle region of the flexible display panel (120) in a compressed, deformed state while the two edge portions of the flexible display panel (120) are held by the edge tension members (141, 142).

[0110] A low-friction layer may be disposed on the surface of the elastic support layer (135). The low-friction layer may allow the flexible display panel (120) to move slightly in the width direction or elastically deform relative to the back support plate (131) when a width direction tensile force (TW) is applied.

[0111] The elastic support layer (135) may be formed continuously on the entire upper surface of the back support plate (131) or may be spaced apart in the form of a plurality of support pads.

[0112] The elastic support layer (135) can absorb the height difference between the flexible display panel (120) and the back support plate (131) and prevent the central part of the flexible display panel (120) from lifting off the back support plate (131).

[0113] Edge tension member and retaining groove

[0114] Referring to FIGS. 6 and 7, the first edge tension member (141) and the second edge tension member (142) may include a pair of edge tension rails (143a, 143b).

[0115] The first edge tension rail (143a) may be positioned on one side in the width direction of the back support structure (130), and the second edge tension rail (143b) may be positioned on the other side in the width direction of the back support structure (130).

[0116] The edge tension rails (143a, 143b) can be extended in the withdrawal direction (D1).

[0117] The edge tension rails (143a, 143b) can be supported so as to be movable in the width direction (D2) by a linear guide formed in the back support structure (130).

[0118] A retaining groove (144) may be formed in each edge tension rail (143a, 143b).

[0119] The retaining groove (144) may have a C-shaped, T-shaped, hook-shaped, or undercut cross-section.

[0120] The retaining groove (144) can be extended in the withdrawal direction (D1). The two edge portions of the flexible display panel (120) can slide in the withdrawal direction (D1) inside the retaining groove (144).

[0121] The retaining groove (144) can restrict the edge portion of the flexible display panel (120) from coming out of the retaining groove (144) in the width direction (D2).

[0122] The retaining groove (144) can restrict the edge portion of the flexible display panel (120) from deviating in the thickness direction (D3), particularly in the direction away from the back support plate (131).

[0123] Therefore, both edges of the flexible display panel (120) can move in the drawing direction (D1), while being constrained by edge tension rails (143a, 143b) in the width direction (D2) and thickness direction (D3).

[0124] A reinforcing part (127) may be formed in the inactive area (126) of the flexible display panel (120).

[0125] The reinforcing member (127) can be flexibly formed so as to be wound onto a storage roller (115) together with a flexible display panel (120) or pass through a bending path.

[0126] The reinforcing part (127) may include a multilayer film formed by folding the edge of the flexible display panel (120), a reinforcing strip attached to the flexible display panel (120), a flexible bead, a flexible wire core, or a flexible connecting part having a T-shaped cross section.

[0127] The reinforcing member (127) can be accommodated in the retaining groove (144). When the edge tension rails (143a, 143b) move outward in the width direction, the inner locking surface of the retaining groove (144) can transmit a force in the width direction to the reinforcing member (127).

[0128] The reinforcing member (127) can reduce the concentration of tensile load directly on the active area (125) of the flexible display panel (120) and distribute the tensile force (TW) in the width direction over the length of the drawing direction of the flexible display panel (120).

[0129] A low-friction liner, a fine roller, a lubricating coating, or an elastic liner may be placed on the inner surface of the retaining groove (144). Accordingly, friction and wear can be reduced when the reinforcing member (127) moves in the withdrawal direction (D1) inside the retaining groove (144).

[0130] Entry and Exit Guide

[0131] Referring to FIG. 8, an entry / exit guide (145) may be placed in the outlet (112) of the housing (110).

[0132] The entry / exit guide (145) can guide the reinforcing part (127) of the flexible display panel (120) to smoothly enter the retaining groove (144) of the edge tension rail (143a, 143b) or smoothly exit from the retaining groove (144).

[0133] The entry / exit guide (145) may include a tapered guide surface (146) in which the width or opening size gradually changes along the withdrawal direction (D1).

[0134] When the flexible display panel (120) is withdrawn from the housing (110), the reinforcing member (127) moves along the guide surface (146) and aligns with the entrance of the retaining groove (144), and can sequentially enter the interior of the retaining groove (144).

[0135] When the flexible display panel (120) is stored inside the housing (110), the reinforcing member (127) can move along the guide surface opposite the entry / exit guide (145) and sequentially detach from the retaining groove (144).

[0136] After the reinforcing member (127) is removed from the retaining groove (144), the flexible display panel (120) can be bent or wound toward the storage roller (115).

[0137] Therefore, the edge tension rails (143a, 143b), the retaining groove (144), and the motion conversion mechanism (150) are not wound onto the storage roller (115), and only the flexible display panel (120) and the flexible reinforcing member (127) can be wound onto the storage roller (115).

[0138] The entry / exit guide (145) may include an upper guide and a lower guide that maintain the thickness direction position of the reinforcing part (127).

[0139] A sensor for detecting whether the reinforcing part (127) enters or exits may be optionally placed in the entry / exit guide (145), but the motion conversion mechanism (150) of the present invention can operate mechanically without such a sensor.

[0140] Rack-and-pinion motion conversion device

[0141] Referring to FIGS. 9 and 10, the motion conversion mechanism (150) may include a linear-rotation conversion unit (151) and a rotation-linear conversion unit (155).

[0142] The linear-rotation conversion unit (151) may include an input rack (152) and an input pinion (153).

[0143] The input rack (152) can be fixed to the housing (110) and can be extended in the withdrawal direction (D1).

[0144] The input pinion (153) can be rotatably supported on a rear support structure (130), a rear support plate (131), or a carriage that moves together with the rear support structure (130).

[0145] The input pinion (153) can be coupled to a common rotation axis (154). Both ends of the common rotation axis (154) can be rotatably supported by bearing supports (159).

[0146] When the rear support structure (130) moves in the withdrawal direction (D1) relative to the housing (110) and the input pinion (153) engages with the input rack (152), the input pinion (153) can rotate while moving along the input rack (152).

[0147] The rotation-linear conversion unit (155) may include an output pinion (156), a first output rack (157), and a second output rack (158).

[0148] The output pinion (156) can be coupled to the same common rotation axis (154) as the input pinion (153). The input pinion (153) and the output pinion (156) can form a composite gear positioned at different axial positions.

[0149] The first output rack (157) extends in the width direction (D2) from one side of the output pinion (156) and can be engaged with the output pinion (156).

[0150] The second output rack (158) extends in the width direction (D2) on the opposite side of the first output rack (157) with the output pinion (156) in between and can be engaged with the output pinion (156).

[0151] The first output rack (157) and the second output rack (158) can be positioned on opposite tangential sides of the output pinion (156).

[0152] When the output pinion (156) rotates, the first output rack (157) and the second output rack (158) can move in opposite width directions (D2).

[0153] The first output rack (157) can be connected to the first edge tension member (141), and the second output rack (158) can be connected to the second edge tension member (142).

[0154] Accordingly, the rotation of the input pinion (153) can be converted into symmetric outward movement of the first edge tension member (141) and the second edge tension member (142) through the output pinion (156).

[0155] If the pitch radius of the input pinion (153) is (r_i), the pitch radius of the output pinion (156) is (r_o), and the distance traveled by the back support structure (130) in the tension generation section of the input rack (152) is (x), then the rotation angle () of the input pinion (153) under ideal non-slip conditions can be expressed approximately as follows.

[0156] [ = ]

[0157] The widthwise displacement (y) of each of the first output rack (157) and the second output rack (158) can be approximately expressed as follows.

[0158] [ y=r_o ]

[0159] Therefore, the increase in the gap (W) between the first edge tension member (141) and the second edge tension member (142) can be expressed approximately as follows.

[0160] [ W=2y=2x ]

[0161] The pitch diameter or pitch radius of the output pinion (156) can be formed to be smaller than the pitch diameter or pitch radius of the input pinion (153).

[0162] Accordingly, a relatively large amount of withdrawal movement of the back support structure (130) can be converted into a relatively small amount of width-direction movement of the edge tension members (141, 142).

[0163] By reducing the pitch diameter of the output pinion (156), the amount of movement of the edge tension member (141, 142) can be reduced, while the force transmitted to the output rack (157, 158) can be increased.

[0164] One or more intermediate gears or reduction gear trains may be arranged between the input pinion (153) and the output pinion (156).

[0165] When the rotation axis of the input pinion (153) and the rotation axis of the output pinion (156) are arranged in different directions, a bevel gear, worm gear, helical gear, or cross-axis gear may be used.

[0166] Free movement section and tension generation section

[0167] Referring to FIG. 11, the input rack (152) may include a free movement section (152a) and a tension generation section (152b).

[0168] In the free movement section (152a), a tooth profile that meshes with the input pinion (153) is not formed, or the input pinion (153) may be separated from the input rack (152).

[0169] While the flexible display panel (120) and the back support structure (130) are pulled out along the free movement section (152a), the input pinion (153) may not substantially rotate.

[0170] Accordingly, the gap between the first edge tension member (141) and the second edge tension member (142) is substantially maintained, and a large width direction tensile force (TW) may not be applied to the flexible display panel (120).

[0171] The tension generation section (152b) can be positioned at the exit end of the rear support structure (130) rather than the free movement section (152a).

[0172] When the back support structure (130) reaches the set withdrawal position, the input pinion (153) can engage with the teeth of the tension generation section (152b).

[0173] When the back support structure (130) moves further in the tension generation section (152b), the input pinion (153) rotates, and the edge tension members (141, 142) can move outward in the width direction through the output pinion (156), the first output rack (157), and the second output rack (158).

[0174] The length of the tension generation section (152b) can be set according to the width direction tensile force (TW) required for the flexible display panel (120) and the target amount of movement of the edge tension members (141, 142).

[0175] When the flexible display panel (120) begins to be stored, the input pinion (153) can rotate in the opposite direction while moving in the opposite direction along the tension generation section (152b).

[0176] Accordingly, the first output rack (157) and the second output rack (158) move inward in the width direction, and the width direction tensile force (TW) applied to the flexible display panel (120) can be reduced or released.

[0177] After the width-direction tension (TW) is released, the input pinion (153) enters the free movement section (152a), and the flexible display panel (120) and the rear support structure (130) can be housed inside the housing (110).

[0178] Delayed coupling and sequential operation

[0179] Referring to FIG. 12, the motion conversion mechanism (150) may include a delay coupling part (160).

[0180] The delay coupling portion (160) can restrict the edge tension members (141, 142) from moving outward before the back support structure (130) sufficiently supports the middle area of ​​the flexible display panel (120).

[0181] The delay coupling portion (160) may include at least one of a clearance portion (161), an elongated hole coupling portion (162), an optional engagement portion (163), and a clutch (164).

[0182] The clearance portion (161) can provide mechanical clearance set so that the initial withdrawal movement of the back support structure (130) is not transmitted to the output side of the motion conversion mechanism (150).

[0183] The elongated hole coupling part (162) prevents force from being transmitted to the output side while the driving pin moves inside the elongated hole, and allows force to be transmitted to the output side after the driving pin reaches the end of the elongated hole.

[0184] The optional engagement portion (163) can engage the input rack (152) or other driving member with the input pinion (153) when the back support structure (130) reaches a set support position.

[0185] The clutch (164) can selectively connect the input side and the output side depending on the withdrawal position of the rear support structure (130).

[0186] When withdrawing, it may operate in the following order.

[0187] First, the flexible display panel (120) and the back support structure (130) can be withdrawn from the housing (110).

[0188] The back support structure (130) can reach a set support position that substantially supports the middle area of ​​the drawn-out display area (121) of the flexible display panel (120).

[0189] Afterward, the clearance of the delay coupling part (160) is exhausted or a selective engagement is formed, and the motion conversion mechanism (150) is operated to move the edge tension member (141, 142) outward in the width direction.

[0190] When storing, the above process may operate in the reverse order.

[0191] First, the motion conversion mechanism (150) can move the edge tension members (141, 142) inward in the width direction to release the width direction tension force (TW).

[0192] Afterwards, the rear support structure (130) and the flexible display panel (120) can be housed inside the housing (110).

[0193] Therefore, it is possible to prevent the flexible display panel (120) from being wound onto the storage roller (115) while being pulled taut in the width direction.

[0194] Tension transmission, movement guidance, and tension maintenance

[0195] Referring to FIG. 13, the first edge tension member (141) and the second edge tension member (142) may each include an integrated tension transfer bar (147).

[0196] The integrated tension transfer bar (147) can be extended in the withdrawal direction (D1).

[0197] The first output rack (157) and the second output rack (158) can each be connected to a corresponding integrated tension transfer bar (147).

[0198] Width-direction movement occurring in one output rack can be transmitted over the length of the drawn-out display area (121) of the flexible display panel (120) through an integrated tension transfer bar (147).

[0199] The integrated tension transfer bar (147) may be formed integrally with the edge tension rails (143a, 143b) and may be connected to the edge tension rails (143a, 143b) at a plurality of connection points.

[0200] The first output rack (157) and the second output rack (158) can each be coupled to a pair of linear guides (148).

[0201] The linear guide (148) can restrict unnecessary movement and rotation in the drawing direction (D1) and thickness direction (D3) while allowing the output rack (157, 158) to move in the width direction (D2).

[0202] The first output rack (157) and the second output rack (158) can move by substantially the same amount in opposite width directions depending on the rotation of the output pinion (156).

[0203] Accordingly, the center position in the width direction of the flexible display panel (120) can be substantially maintained.

[0204] The motion conversion mechanism (150) may include a movement limiting stopper (171) that limits the amount of movement in the maximum width direction.

[0205] The movement limiting stopper (171) can limit the outward movement of the output rack (157, 158), edge tension member (141, 142), or integrated tension transfer bar (147) at a set position.

[0206] The motion conversion mechanism (150) may include a locking part (172) that maintains a state in which a widthwise tensile force (TW) is applied.

[0207] The locking part (172) may include a ratchet, cam lock, overcenter link, friction lock, wedge lock, or elastic lock.

[0208] The locking part (172) can maintain an increased gap between the edge tension members (141, 142) even without a separate driving power supply.

[0209] An elastic connection (173) may be placed between the output rack (157, 158) and the edge tension member (141, 142).

[0210] The elastic connection part (173) may include a coil spring, a leaf spring, an elastic block, an elastic rib, or a flexible connecting piece.

[0211] When the width-direction tensile force (TW) applied to the flexible display panel (120) exceeds a set limit, the elastic connection (173) is elastically deformed to absorb additional outward movement of the edge tension members (141, 142).

[0212] The elastic connection (173) may also compensate for thermal expansion, manufacturing tolerances, creep and assembly deviations due to long-term use of the flexible display panel (120).

[0213] Inclined guide type motion conversion mechanism

[0214] Referring to FIG. 14, a motion conversion mechanism (180) according to another embodiment may include a first inclined guide section (181), a second inclined guide section (182), a first driven part (183), and a second driven part (184).

[0215] The first inclined guide section (181) and the second inclined guide section (182) may be formed in the housing (110), the rear support structure (130), or the relative moving member between them.

[0216] The first inclined guide section (181) and the second inclined guide section (182) can be formed to be inclined outward in the width direction while extending along the withdrawal direction (D1).

[0217] The first driven member (183) can be connected to the first edge tension member (141), and the second driven member (184) can be connected to the second edge tension member (142).

[0218] When the back support structure (130) moves in the withdrawal direction (D1), the first driven part (183) and the second driven part (184) can each move along the inclined guide section (181, 182).

[0219] Due to the slope of the slope guide sections (181, 182), the first edge tension member (141) and the second edge tension member (142) can move outward in the width direction.

[0220] The inclined guide section (181, 182) may include a parallel guide section at the beginning of the withdrawal and a widening guide section at the end of the withdrawal.

[0221] In the parallel guide section, the spacing between the edge tension members (141, 142) can be substantially maintained, and only in the widened guide section can the spacing between the edge tension members (141, 142) be increased.

[0222] Accordingly, the pulling motion of the flexible display panel (120) can be directly converted into a widthwise tension application motion without using a rack and pinion.

[0223] Counter-screw type motion conversion mechanism

[0224] Referring to FIG. 15, a motion conversion mechanism (190) according to another embodiment may include a rotation axis (191), a first screw portion (192), a second screw portion (193), a first moving nut (194), and a second moving nut (195).

[0225] The rotation axis (191) can be extended in the width direction (D2).

[0226] The first screw portion (192) and the second screw portion (193) can be formed in opposite spiral directions on the rotation axis (191).

[0227] The first movable nut (194) can be coupled to the first threaded portion (192), and the second movable nut (195) can be coupled to the second threaded portion (193).

[0228] The first movable nut (194) can be connected to the first edge tension member (141), and the second movable nut (195) can be connected to the second edge tension member (142).

[0229] When the rotation axis (191) rotates in the first direction, the first moving nut (194) and the second moving nut (195) can move outward in opposite width directions.

[0230] When the rotation axis (191) rotates in the opposite direction, the first moving nut (194) and the second moving nut (195) can return inward in the width direction.

[0231] The rotation axis (191) can be rotated by an input rack and pinion, cam, friction roller, or link that converts the withdrawal direction movement of the back support structure (130) into rotational motion.

[0232] The opposing screw type motion conversion mechanism (190) can set the amount of movement in the width direction of the edge tension member (141, 142) and the output force according to the size of the screw lead.

[0233] withdrawal operation of electronic devices

[0234] When the electronic device (100) is in a storage state, at least a portion of the flexible display panel (120) can be stored in the receiving space (111) of the housing (110).

[0235] The flexible display panel (120) can be wound onto a storage roller (115), and the back support structure (130) can be stored in a straight storage path that is distinct from the storage path of the flexible display panel (120).

[0236] The edge tension members (141, 142) can be positioned in a return position in the width direction inside.

[0237] When the leading frame (129) moves in the withdrawal direction (D1) by operation of the user or by driving of the panel driving unit, the flexible display panel (120) can be withdrawn to the outside of the housing (110).

[0238] In conjunction with the withdrawal of the flexible display panel (120), the back support structure (130) can also move in the withdrawal direction (D1).

[0239] The reinforcing part (127) of the flexible display panel (120) can move along the entry / exit guide (145) and sequentially enter the retaining groove (144) of the edge tension rail (143a, 143b).

[0240] In the free movement section, the gap between the edge tension members (141, 142) can be substantially maintained.

[0241] When the back support structure (130) reaches a set support position that supports the middle area of ​​the drawn-out display area (121), the motion conversion mechanism (150) can be operated.

[0242] The input pinion (153) rotates in engagement with the tension generation section of the input rack (152), and the output pinion (156) can move the first output rack (157) and the second output rack (158) in opposite width directions.

[0243] Accordingly, the gap between the first edge tension member (141) and the second edge tension member (142) increases, and a width-direction tensile force (TW) can be applied to the flexible display panel (120).

[0244] The retaining groove (144) can limit the two edges of the flexible display panel (120) from lifting upward.

[0245] The elastic support layer (135) can make preload contact with the back surface (124) of the middle area of ​​the flexible display panel (120).

[0246] Accordingly, the flexible display panel (120) can be constrained in the thickness direction at both edges and back-supported in the central area, and maintained in a tensioned state in the width direction.

[0247] The locking part (172) can maintain the position of the edge tension members (141, 142).

[0248] Storage operation of electronic devices

[0249] When a storage command is entered for the flexible display panel (120), the lock (172) can be released.

[0250] When the rear support structure (130) begins to move in the storage direction, the input pinion (153) can rotate in the opposite direction along the tension generation section.

[0251] The first output rack (157) and the second output rack (158) can move inward in the width direction by the opposite rotation of the output pinion (156).

[0252] Accordingly, the gap between the first edge tension member (141) and the second edge tension member (142) is reduced, and the width direction tension (TW) can be released.

[0253] After the width-direction tensile force (TW) is released, the flexible display panel (120) and the back support structure (130) can be housed inside the housing (110).

[0254] The reinforcing part (127) of the flexible display panel (120) can be sequentially removed from the retaining groove (144) by the entry / exit guide (145).

[0255] The flexible display panel (120), with the reinforcing part (127) detached from the retaining groove (144), can be wound onto a storage roller (115).

[0256] The rear support structure (130) can be stored inside the housing (110) along a straight storage path that is distinct from the flexible display panel (120).

[0257] Accordingly, the edge tension rails (143a, 143b), motion conversion mechanism (150), and back support structure (130) can be prevented from being wound onto the storage roller (115).

[0258] Modification and combination of embodiments

[0259] The aforementioned rack-and-pinion type motion conversion mechanism, inclined guide type motion conversion mechanism, and opposing screw type motion conversion mechanism are not limited to being mutually exclusive.

[0260] For example, input motion can be generated through a rack and input pinion, and output motion can be generated through a counter-screw structure.

[0261] Elastic connections and locking parts may also be added to the inclined guide type motion conversion mechanism.

[0262] The rear support structure may include a single rear support plate, multiple telescopic support plates, multiple slats, a link-type support structure, or a combination thereof.

[0263] The edge tension member may be formed as a continuous rail or as a plurality of tension transfer pieces spaced apart from each other in the withdrawal direction.

[0264] The motion conversion mechanism may receive input motion from one of the front frame (129), rear support plate (131), and telescopic support plate of the flexible display panel (120), or from a separate carriage that moves relative to the housing (110).

[0265] If linear motion in the withdrawal direction can be converted into motion in the width direction, the motion conversion mechanism may include a cam, link, cable, pulley, wedge, lever, crank, gear, or a combination thereof.

[0266] The scope of rights of the present invention is defined by the following claims, and modifications or variations falling within the scope equivalent to the technical concept of the claims are also included within the scope of the present invention. Explanation of the symbols

[0267] 100: Electronic device 110: Housing 111: Accommodation space 112: Exit 113: Storage path of flexible display panel 114: Storage path of rear support structure 115: Storage Roller 120: Flexible display panel 121: Withdrawn display area 122: Stored area 123: Front 124: Back 125: Active area 126: Inactive area 127: Reinforcement section 129: Tip frame 130: Rear support structure 131: Rear support plate 131a: First support plate 131b: Second support plate 131c: Third supporting plate 132: Support guide rail 133: Guide Block 134: Stopper 135: Elastic support layer 141: First edge tension member 142: Second edge tension member 143a: First edge tension rail 143b: Second edge tension rail 144: Maintain Home 145: Entry & Exit Guide 146: Annyeong-myeon 147: Integrated tension transfer bar 148: Linear Guide 150: Motion conversion device 151: Line-to-Rotation Transformer 152: Input Rack 152a: Free movement section 152b: Tension generation section 153: Input pinion 154: Common axis of rotation 155: Rotation-to-Linear Transformation Unit 156: Output pinion 157: 1st Output Rack 158: 2nd output rack 159: Bearing support 160: Delayed coupling 161: Ranger Unit 162: Elongated hole joint 163: Optional interlock 164: Clutch 171: Movement restriction stopper 172: Locking part 173: Elastic connection 180: Inclined-guided motion conversion mechanism 181: 1st Slope Guide Section 182: Second Slope Guide Section 183: 1st continuum 184: 2nd continuum 190: Counter-screw type motion conversion mechanism 191: Rotation axis 192: First screw section 193: Second screw section 194: First moving nut 195: Second moving nut D1: Withdrawal direction D2: Width direction D3: Thickness direction TW: Tensile force in the width direction

Claims

Claim 1 A housing having an internal receiving space; a flexible display panel in which at least a portion is received in the receiving space and the area of ​​the display region exposed to the outside of the housing is expanded as it is withdrawn from the housing in a withdrawal direction; a back support structure capable of receiving in the receiving space and withdrawn from the housing in conjunction with the withdrawal of the flexible display panel, and supporting the back of an intermediate region located between the two edges in the width direction intersecting the withdrawal direction of the withdrawn display region of the flexible display panel; and a pair of edge tension members coupled to each of the two edge portions in the width direction of the flexible display panel to transmit a force in the width direction. An electronic device comprising a motion conversion mechanism that converts the linear motion in the withdrawal direction occurring in conjunction with the withdrawal of the flexible display panel into the motion in the width direction that increases the gap between the pair of edge tension members, wherein a tensile force along the width direction is applied to the withdrawn display area by the increase in the gap between the pair of edge tension members, and wherein the back support structure maintains support for the back surface of the intermediate area while the tensile force along the width direction is applied. Claim 2 An electronic device according to claim 1, wherein the rear support structure comprises at least one rear support plate that is stored in the receiving space along a straight movement path distinct from the path in which the flexible display panel is stored in the receiving space, and is withdrawn through an outlet of the housing in conjunction with the withdrawal of the flexible display panel. Claim 3 An electronic device according to paragraph 2, wherein the back support plate comprises a plurality of support plates that overlap so as to be movably relative to each other in the withdrawal direction, and the plurality of support plates are sequentially unfolded in conjunction with the withdrawal of the flexible display panel. Claim 4 An electronic device according to claim 2, wherein the back support plate comprises an elastic support layer disposed on an upper surface facing the back surface of the flexible display panel, and the elastic support layer elastically contacts the back surface of the intermediate region of the flexible display panel while the two edge portions of the flexible display panel are maintained by the pair of edge tension members. Claim 5 An electronic device according to claim 1, wherein the pair of edge tension members each extend in the drawing direction and are positioned on both sides in the width direction of the rear support structure and are guided to move in the width direction relative to the rear support structure. Claim 6 An electronic device according to claim 5, wherein the pair of edge tension rails each include a retaining groove that accommodates the two edge portions in the width direction of the flexible display panel, and the retaining groove extends in the pull-out direction to allow the edge portion of the flexible display panel to move in the pull-out direction and to restrict the edge portion from deviating in the width direction and the thickness direction of the flexible display panel. Claim 7 An electronic device according to claim 6, wherein a pair of reinforcing members capable of being wound or bent together with the flexible display panel are each formed on the widthwise side edge portions of the flexible display panel, and the pair of reinforcing members are each received in the retaining grooves to receive a force in the widthwise direction from the pair of edge tension rails. Claim 8 An electronic device according to claim 7, characterized in that an entry / exit guide is disposed in the outlet of the housing, which sequentially introduces the pair of reinforcing members into the retaining groove as the flexible display panel is drawn out, and sequentially removes the pair of reinforcing members from the retaining groove as the flexible display panel is received into the receiving space. Claim 9 An electronic device according to claim 1, wherein the motion conversion mechanism comprises: a linear-rotational conversion unit that converts the linear motion of the back support structure in the withdrawal direction into rotational motion; and a rotational-linear conversion unit that converts the rotational motion into the linear motion of the pair of edge tension members in the opposite width direction. Claim 10 An electronic device according to claim 9, wherein the linear-rotational converter comprises: an input rack fixed to the housing and extending in the withdrawal direction; and an input pinion rotatably supported on the rear support structure and engaged with the input rack, wherein the input pinion rotates as the rear support structure moves in the withdrawal direction relative to the housing. Claim 11 An electronic device according to claim 10, wherein the rotation-linear conversion unit comprises: an output pinion connected coaxially with the input pinion; a first output rack engaged with one side of the output pinion and extending in the width direction; and a second output rack engaged with the output pinion on the opposite side of the first output rack and extending in the width direction with the output pinion in between, wherein the first output rack and the second output rack are each connected to the pair of edge tension members and move in the width directions opposite to each other according to the rotation of the output pinion. Claim 12 An electronic device according to claim 11, characterized in that the pitch diameter of the output pinion is formed to be smaller than the pitch diameter of the input pinion, and the amount of movement in the pulling direction of the back support structure is set to be greater than the amount of movement in the width direction of the pair of edge tension members. Claim 13 An electronic device according to claim 10, wherein the input rack comprises: a free movement section that does not transmit rotational force to the input pinion while the back support structure is being withdrawn; and a tension generating section disposed at the end of the withdrawal of the back support structure relative to the free movement section and having a tooth profile formed to mesh with the input pinion. Claim 14 An electronic device according to claim 9, wherein the motion conversion mechanism comprises a delay coupling member configured to limit the increase in the gap between the pair of edge tension members until the back support structure reaches a set support position that supports the intermediate area of ​​the drawn-out display area, and to initiate the increase in the gap after the back support structure reaches the set support position. Claim 15 An electronic device according to claim 14, wherein the delay coupling member comprises at least one of a clearance member, an elongated hole coupling member, a selective engagement member, and a clutch that delays the transmission of force between the input side and the output side of the motion conversion mechanism during the withdrawal process of the rear support structure, and is configured to reduce the gap between the pair of edge tension members before the rear support structure enters the receiving space during the storage process of the flexible display panel. Claim 16 An electronic device according to claim 11, wherein each of the pair of edge tension members comprises an integral tension transmission bar extending in the withdrawal direction, and the first output rack and the second output rack are each connected to the integral tension transmission bar to transmit the movement of the first output rack and the second output rack over the length of the withdrawal direction of the withdrawn display area of ​​the flexible display panel. Claim 17 An electronic device according to claim 11, wherein the first output rack and the second output rack are each coupled to a pair of linear guides disposed on the back support structure, and move by substantially equal amounts of movement in the width direction opposite to each other according to the rotation of the output pinion to maintain the width direction center position of the flexible display panel. Claim 18 An electronic device according to claim 11, wherein the motion conversion mechanism comprises: a stopper that limits the maximum gap between the pair of edge tension members; and a locking member that maintains a tensile force along the width direction by limiting the movement of at least one of the first output rack, the second output rack, or the output pinion when the gap between the pair of edge tension members is increased. Claim 19 An electronic device according to claim 11, wherein an elastic connection is disposed between the first output rack and one of the pair of edge tension members and between the second output rack and the other of the pair of edge tension members, and the elastic connection is elastically deformed when the tensile force in the width direction applied to the flexible display panel exceeds a set limit, thereby absorbing additional outward movement of the pair of edge tension members. Claim 20 An electronic device according to claim 1, wherein the motion conversion mechanism comprises: a pair of inclined guide sections formed in one of the housing and the back support structure and extending along the withdrawal direction and inclined outward in the width direction; and a pair of driven members each connected to the pair of edge tension members and moving along the pair of inclined guide sections, wherein the gap between the pair of edge tension members increases as the pair of driven members move along the inclined guide sections in accordance with the movement of the back support structure in the withdrawal direction. Claim 21 An electronic device according to claim 1, wherein the motion conversion mechanism comprises: a rotating shaft that rotates in conjunction with the movement of the rear support structure in the pulling direction; a first screw portion and a second screw portion formed on the rotating shaft and having opposite spiral directions; and a first moving nut and a second moving nut that are respectively coupled to the first screw portion and the second screw portion and respectively connected to the pair of edge tension members, wherein the first moving nut and the second moving nut move in opposite width directions according to the rotation of the rotating shaft. Claim 22 An electronic device according to claim 1, characterized in that the motion conversion mechanism is configured to receive a driving force for moving the pair of edge tension members from the relative linear movement in the pulling direction between the back support structure and the housing.

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