Patent Description:
As the information society has developed, the demand for display device is increasing in various forms, and accordingly, in recent years, various display devices such as a liquid crystal display (LCD), plasma display panel (PDP), electroluminescent display (ELD), vacuum fluorescent display (VFD), and the like have been studied and used.

Thereamong, a display device using an organic light emitting diode (OLED) has excellent luminance and viewing angle characteristics in comparison with a liquid crystal display device and does not require a backlight unit, thereby being implemented in an ultrathin type.

In addition, a flexible display panel can be bent or wound around a roller. The flexible display panel may be used to implement a display device that unfolds on a roller or winds around the roller. Many studies have been made on a structure for winding a flexible display panel around a roller or unwinding the flexible display panel from the roller. <CIT> and <CIT> relate to a rollable flexible display device. <CIT> relates to a display apparatus.

It is an object of the present disclosure to solve the above and other problems.

It is another object of the present disclosure to prevent damage to a display panel generated when the display panel is wound around a roller.

It is a further object of the present disclosure to eliminate vibration and noise generated when the display panel is wound around the roller.

In accordance with the present disclosure, the above and other objects can be accomplished by the provision of a display device including a housing providing an internal accommodation space, a roller installed in the housing, a display panel which is wound around or unwound from the roller, a module cover having a plurality of segments extending long in a longitudinal direction of the housing, the plurality of segments being sequentially arranged at the rear of the display panel in an upward-downward direction of the display panel, the module cover which is wound around or unwound from the roller together with the display panel, a foldable link located at the rear of the display panel, one side of the foldable link being pivotably connected to the housing, the other side of the foldable link being pivotably connected to the upper side of the module cover, the foldable link being configured to stand up the display panel and the module cover while unwinding the display panel and the module cover from the roller, an extension sheet extending from the lower side of the display panel, the extension sheet which is wound around the roller, and at least one shock-absorbing member located next to a segment located at the lower end, among the plurality of segments of the module cover, the at least one shock-absorbing member fixed to the rear surface of the extension sheet.

The effects of the display device according to the present disclosure will be described.

According to at least one of the embodiments of the present disclosure, it is possible to prevent damage to a display panel generated when the display panel is wound around a roller.

According to at least one of the embodiments of the present disclosure, it is possible to eliminate vibration and noise generated when the display panel is wound around the roller.

<FIG> are views illustrating examples of a display device according to embodiments of the present disclosure.

A description will now be given in detail according to exemplary embodiments disclosed herein, with reference to the accompanying drawings. For the sake of brevity of description with reference to the drawings, the same or equivalent components is denoted by the same reference numbers, and a description thereof will not be repeated.

In general, suffixes such as "module" and "unit" may be used to refer to elements or components. The use of such suffixes herein is merely intended to facilitate description of the specification, and the suffixes do not have any special meaning or function.

In the present disclosure, that which is well known to one of ordinary skill in the relevant art has generally been omitted for the sake of brevity. The accompanying drawings are used to assist in easy understanding of various technical features, and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes, in addition to those which are particularly set out in the accompanying drawings.

It will be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms.

It will be understood that when an element is referred to as being "connected with" another element, intervening elements may be present. In contrast, it will be understood that when an element is referred to as being "directly connected with" another element, there are no intervening elements present.

A singular representation may include a plural representation unless the context clearly indicates otherwise.

In the following description, when an example is described with reference to a specific figure, a reference numeral that is not illustrated in the specific figure may be mentioned. The reference numeral that is not illustrated with the specific figure is used in the case in which the reference numeral is indicated in the other figures.

Referring to <FIG>, a display device <NUM> may include a display unit <NUM> and a housing <NUM>. The housing <NUM> may have an internal space. At least a portion of the display unit <NUM> may be located inside the housing <NUM>. At least a portion of the display unit <NUM> may be located outside the housing <NUM>. The display unit <NUM> may display a screen.

The direction parallel to the longitudinal direction of the housing <NUM> may be referred to as a first direction DR1, +x axis direction, -x axis direction, a left direction, or a right direction. The direction in which the display unit <NUM> displays a screen may be referred to as +z axis, a forward direction, or the front. The direction opposite to the direction in which the display unit <NUM> displays the screen may be referred to as -z axis, a rearward direction, or the rear. A third direction DR3 may be parallel to +z axis direction or -z axis direction. The direction parallel to the height direction of the display device <NUM> may be referred to as a second direction DR2, +y axis direction, the -y axis direction, an upper direction, or a lower direction.

The third direction DR3 may be a direction perpendicular to the first direction DR1 and/or the second direction DR2. The first direction DR1 and the second direction DR2 may be collectively referred to as a horizontal direction. In addition, the third direction DR3 may be referred to as a vertical direction. A left and right direction LR may be parallel to the first direction DR1, and an up and down direction UD may be parallel to the second direction DR2.

Referring to <FIG>, the display unit <NUM> may be entirely located inside the housing <NUM>. At least a portion of the display unit <NUM> may be located outside the housing <NUM>. The degree to which the display unit <NUM> is exposed to the outside of the housing <NUM> may be adjusted as necessary.

Referring to <FIG>, the display unit <NUM> may include a display panel <NUM> and a plate <NUM>. The display panel <NUM> may be flexible. For example, the display panel <NUM> may be an organic light emitting display (OLED).

The display panel <NUM> may have a front surface for displaying an image. The display panel <NUM> may have a rear surface facing the front surface. The front surface of the display panel <NUM> may be covered with a light transmissive material. For example, the light transmissive material may be a synthetic resin or film.

The plate <NUM> may be coupled, fastened or attached to the rear surface of the display panel <NUM>. The plate <NUM> may include a metal material. The plate <NUM> may be referred to as a module cover <NUM>, a cover <NUM>, a display panel cover <NUM>, a panel cover <NUM>, or an apron <NUM>.

Referring to <FIG>, the plate <NUM> may include a plurality of segments 15c. A magnet <NUM> may be located inside a recess <NUM> of the segment 15c. The recess <NUM> may be located on a surface of the segment 15c facing the display panel <NUM>. The recess <NUM> may be located in the front surface of each segment 15c. Since the magnet <NUM> is accommodated inside the recess <NUM>, the magnet <NUM> may not protrude from the segment 15c. The display panel <NUM> may be flat without being wrinkled even when it is in contact with the segment 15c.

Referring to <FIG>, a plurality of magnets <NUM> may be located on a link <NUM>. For example, at least one magnet <NUM> may be located on a first arm 73a and at least one magnet <NUM> may be located on a second arm 73b. The plurality of magnets <NUM> may be spaced apart from each other.

Referring to <FIG>, one magnet <NUM> may be located on the first arm 73a and the second arm 73b, respectively. The magnet <NUM> may have a shape extended in the long side direction of the first arm 73a and the second arm 73b. Since the magnet <NUM> has a shape extended in the long side direction of the first arm 73a and the second arm 73b, the area of the portion where the link <NUM> is in close contact with the display panel and the module cover may be increased. Accordingly, the adhesion between the link <NUM> and the display panel and the module cover may be strengthened.

Referring to <FIG>, the magnet <NUM> may be located in a depression <NUM> formed in the link <NUM>. The depression <NUM> may have a shape recessed inward of the link <NUM>. The magnet <NUM> may be coupled to the link <NUM> through at least one screw <NUM>.

The width LHW in which the depression <NUM> is recessed inwardly of the link <NUM> may be equal to or greater than the thickness MGW of the magnet <NUM>. If the thickness MGW of the magnet <NUM> is greater than the width LHW of the depression <NUM>, the display panel <NUM> and the module cover <NUM> may not be in close contact with the link <NUM>. In this case, the display panel <NUM> may be wrinkled or may not be flat.

A panel protector <NUM> may be located in the rear surface of the display panel <NUM>. The panel protector <NUM> may prevent the display panel <NUM> from being damaged due to friction with the module cover <NUM>. The panel protector <NUM> may include a metal material. The panel protector <NUM> may have a very thin thickness. For example, the panel protector <NUM> may have a thickness of about <NUM>.

Since the panel protector <NUM> contains a metal material, magnetic attraction between the panel protector <NUM> and the magnet <NUM> may occur. Accordingly, the module cover <NUM> located between the panel protector <NUM> and the link <NUM> may be in close contact with the magnet <NUM> even if it does not contain a metal material.

Referring to <FIG>, the module cover <NUM> may be in close contact with the link <NUM> by an upper bar <NUM> of the upper side and a guide bar <NUM> of the lower side (see <FIG>). A portion between the upper bar <NUM> and the guide bar <NUM> of the link <NUM> may not be in close contact with the module cover <NUM>. Alternatively, the central portion of the link <NUM> may not be in close contact with the module cover <NUM>. The central portion of the link <NUM> may be near an arm joint <NUM>. In this case, the distance APRD1, APLD2 between the module cover <NUM> and the link <NUM> may not be constant. In this case, the display panel <NUM> may be bent or twisted.

Referring to <FIG>, when the magnet <NUM> is located in the depression <NUM> of the link <NUM>, the magnet <NUM> attracts the panel protector <NUM>, so that the module cover <NUM> can also be in close contact with the magnet at the same time. That is, the central portion of the link <NUM> may be in close contact with the module cover <NUM>.

Referring to <FIG>, a bead <NUM> may be formed in the upper surface of the segment 15b. The bead <NUM> may have a shape recessed inwardly of segment 15b. The bead <NUM> may have a shape recessed in the —y axis direction. For example, the bead <NUM> may be formed by pressing the segment 15b. A plurality of beads <NUM> may be formed on the segment 15b. The plurality of beads <NUM> may be spaced apart from each other. The bead <NUM> may enhance the rigidity of segment 15b. The bead <NUM> can prevent the shape of the segment 15b from being deformed due to an external impact.

Referring to <FIG>, a source PCB <NUM> may be located above the module cover <NUM>. In the case of roll-up or roll-down, the position of the source PCB <NUM> may be changed with the movement of the module cover <NUM>. AFFC cable <NUM> may be located in the central portion of the module cover <NUM> based on the first direction. The FFC cable <NUM> may be located in both ends of the module cover <NUM> based on the first direction.

Referring to <FIG>, the segment 15d may include a depression <NUM> recessed in the -z axis direction. The depression <NUM> may form a space between the display panel <NUM> and the module cover <NUM>.

The FFC cable <NUM> may be accommodated in a space formed by the depression <NUM>. In addition, the depression <NUM> may improve the rigidity of the segment 15d.

The bead <NUM> may be located on the segment 15d excluding a portion where the depression <NUM> is located. The bead <NUM> may not be located in the portion where the depression <NUM> is located because the thickness of the segment 15d in the third direction becomes thinner.

Referring to <FIG>, a penetrating portion <NUM> may be located in the central portion of the segment 15e based on the first direction. The penetrating portion <NUM> may penetrate the central portion of the segment 15e in the second direction. That is, the penetrating portion <NUM> may be a hole located in the segment 15e. The penetrating portion <NUM> may be a portion where the FFC cable <NUM> is located. Since the penetrating portion <NUM> is formed in the segment 15e, the thickness of the segment 15e may be reduced in comparison with the case where the FFC cable <NUM> is located in the depression <NUM>.

The bead <NUM> may be located on the segment 15e excluding a portion where the penetrating portion <NUM> is located. In the portion where the penetrating portion <NUM> is located, the bead <NUM> may not be located because the thickness of the segment 15e in the third direction becomes thinner.

Referring to <FIG>, a top case <NUM> may cover the source PCB <NUM> and the upper bar <NUM> as well as the display panel <NUM> and the module cover <NUM>. One surface of the upper bar <NUM> may be coupled to the rear surface of the module cover <NUM>, and the other surface thereof may be coupled to the source PCB <NUM>. The upper bar <NUM> may be fixed to the module cover <NUM> to support the source PCB <NUM>.

The lower end of the FFC cable <NUM> may be connected to a timing controller board <NUM> (see <FIG>) inside a panel roller <NUM> (see <FIG>). The FFC cable <NUM> may be wound around or unwound from the panel roller <NUM> together with the display unit <NUM>.

A portion of the FFC cable <NUM> may be located between the display panel <NUM> and the module cover <NUM>. A portion of the FFC cable <NUM> located between the display panel <NUM> and the module cover <NUM> may be referred to as a first portion 231a. The first portion 231a may be located in the depression <NUM> formed by the plurality of segments 15d. Alternatively, the first portion 231a may be accommodated in the depression <NUM> formed by the plurality of segments 15d.

A portion of the FFC cable <NUM> may penetrate the segment 15f. A portion of the FFC cable <NUM> that passes through the segment 15f may be referred to as a second portion 231b. The segment 15f may include a first hole 521a formed in the front surface and a second hole 521b formed in the rear surface. The first hole 521a and the second hole 521b may be connected to each other to form a single hole <NUM>. The hole <NUM> may penetrate the segment 15f in the third direction. The second portion 231b may penetrate the hole <NUM>. The hole <NUM> may be referred to as a connection hole <NUM>.

The upper end of the FFC cable <NUM> may be electrically connected to the source PCB <NUM>. A part of the FFC cable <NUM> may be located in the rear surface of the module cover <NUM>. A portion of the FFC cable <NUM> located in the rear surface of the module cover <NUM> may be referred to as a third portion 231c. The third portion 231c may be electrically connected to the source PCB <NUM>.

The third portion 231c may be covered by the top case <NUM>. Accordingly, the third portion 231c may not be exposed to the outside.

Referring to <FIG>, the FFC cable <NUM> may be connected to the timing controller board <NUM> mounted in the panel roller <NUM>. A penetrating hole <NUM> may be formed on the panel roller <NUM>, and the FFC cable <NUM> may be connected to the timing controller board <NUM> through the penetrating hole <NUM>.

The penetrating hole <NUM> may be located in one side of the panel roller <NUM> and may penetrate an outer circumferential portion of the panel roller <NUM>. The FFC cable <NUM> may be connected to one side of the timing controller board <NUM> through the penetrating hole <NUM>.

Even when the FFC cable <NUM> is located in the outer circumference of the panel roller <NUM>, it may maintain the connection with the timing controller board <NUM> due to the penetrating hole <NUM>. Accordingly, the FFC cable <NUM> may rotate together with the panel roller <NUM> to prevent twisting.

A part of the FFC cable <NUM> may be wound around the panel roller <NUM>. A portion of the FFC cable <NUM> wound around the panel roller <NUM> may be referred to as a fourth portion 231d. The fourth portion 231d may be in contact with the outer circumferential surface of the panel roller <NUM>.

A part of the FFC cable <NUM> may pass through the penetrating hole <NUM>. A portion of the FFC cable <NUM> passing through the penetrating hole <NUM> may be referred to as a fifth portion 231e.

The lower end of the FFC cable <NUM> may be electrically connected to the timing controller board <NUM>. A part of the FFC cable <NUM> may be located inside the panel roller <NUM>. A portion of the FFC cable <NUM> located inside the panel roller <NUM> may be referred to as a sixth portion 231f. The sixth portion 231f may be electrically connected to the timing controller board <NUM>.

Referring to <FIG>, the lower end of the display panel <NUM> may be connected to the roller <NUM>. The display panel <NUM> may be wound around or unwound from the roller <NUM>. The front surface of the display panel <NUM> may be coupled to the plurality of source PCBs <NUM>. The plurality of source PCBs <NUM> may be spaced apart from each other.

A source chip on film (COF) <NUM> may connect the display panel <NUM> and the source PCB <NUM>. The source COF <NUM> may be located in the front surface of the display panel <NUM>. The roller <NUM> may include a first part <NUM> and a second part <NUM>. The first part <NUM> and the second part <NUM> may be fastened by a screw. The timing controller board <NUM> may be mounted in the roller <NUM>.

The source PCB <NUM> may be electrically connected to the timing controller board <NUM>. The timing controller board <NUM> may send digital video data and the timing control signal to the source PCB <NUM>.

The cable <NUM> may electrically connect the source PCB <NUM> and the timing controller board <NUM>. For example, the cable <NUM> may be a flexible flat cable (FFC). The cable <NUM> may penetrate the hole 331a. The hole 331a may be formed in a seating portion <NUM> or the firstpart331. The cable <NUM> may be located between the display panel <NUM> and the second part <NUM>.

The seating portion <NUM> may be formed in an outer circumference of the first part <NUM>. The seating portion <NUM> may be formed by stepping a portion of the outer circumference of the first part <NUM>. The seating portion <NUM> may form a space B. When the display unit <NUM> is wound around the roller <NUM>, the source PCB <NUM> may be accommodated in the seating portion <NUM>. Since the source PCB <NUM> is accommodated in the seating portion <NUM>, the source PCB <NUM> may not be twisted or bent, and durability may be improved.

The cable <NUM> may electrically connect the timing controller board <NUM> and the source PCB <NUM>.

Referring to <FIG>, the roller <NUM> wound around with the display unit <NUM> may be installed in a first base <NUM>. The first base <NUM> may be a bottom surface of the housing <NUM>. The roller <NUM> may be extended along the longitudinal direction of the housing <NUM>. The first base <NUM> may be connected to the side surface 30a of the housing <NUM>.

Referring to <FIG> and <FIG>, the beam 31a may be formed in the first base <NUM>. The beam 31a may improve the bending or torsional rigidity of the first base <NUM>. Many components may be installed in the first base <NUM>, and the first base <NUM> can receive a large load. Since the rigidity of the first base <NUM> is improved, sagging due to the load can be prevented. For example, the beam 31a may be formed by a pressing process.

The second base <NUM> may be spaced upward from the first base <NUM>. The space S1 may be formed in the first base <NUM> and the second base <NUM>. The roller <NUM> wound around with the display unit <NUM> may be accommodated in the space S1. The roller <NUM> may be located between the first base <NUM> and the second base <NUM>.

The second base <NUM> may be connected to the side surface 30a of the housing <NUM>. The bracket <NUM> may be fastened to the upper surface of the first base <NUM>. The bracket <NUM> may be fastened to the side surface 30a of the housing <NUM>.

The beam 32a may be formed in the second base <NUM>. The beam 32a may improve the bending or torsional rigidity of the second base <NUM>. For example, the beam 32a may be formed by a press process.

A third part 32d may be connected to the first part 32b and the second part 32c. A fourth part 32e may be connected to the first part 32b and the second part 32c. A space S2 may be formed between the third part 32d and the fourth part 32e. Accordingly, bending or torsional rigidity of the second base <NUM> may be improved. The third part 32d may be referred to as a reinforcing rib 32d or a rib 32d. The fourth part 32e may be referred to as a reinforcing rib 32e or a rib 32e.

Many components can be installed in the second base <NUM> and the second base <NUM> can receive a large load. As the rigidity of the second base <NUM> is improved, sagging due to the load can be prevented.

A first reinforcing plate <NUM> may be located between the first base <NUM> and the second base <NUM>. The first reinforcing plate <NUM> and the second base <NUM> may be fastened by a screw. The first reinforcing plate <NUM> may support the second base <NUM>. The first reinforcing plate <NUM> may prevent sagging of the second base <NUM>. The first reinforcing plate <NUM> may be located in the central portion of the first base <NUM> or in the central portion of the second base <NUM>. The first reinforcing plate <NUM> may include a curved portion 34a. The curved portion 34a may be formed along the roller <NUM>. The curved portion 34a may not be in contact with the roller <NUM> or the display unit <NUM> wound around the roller <NUM>. The curved portion 34a may maintain a certain distance from the roller <NUM> so as not to interfere with the rotation of the roller <NUM>.

A second reinforcing plate <NUM> may be fastened to the first base <NUM> and the first reinforcing plate <NUM>. The second reinforcing plate <NUM> may support the first reinforcing plate <NUM>. The second reinforcing plate <NUM> may be located behind the first reinforcing plate <NUM>. The second reinforcing plate <NUM> may be located behind the first base <NUM>. The second reinforcing plate <NUM> may be located perpendicular to the first base <NUM>. The second reinforcing plate <NUM> may be fastened to the beam 31a of the first base <NUM>. The second base <NUM> may face the front surface or rear surface of the housing <NUM>.

Referring to <FIG>, the second base 32f may not form a space. When the load that the second base 32f receives is not large, the second base 32f may have sufficient rigidity by including the beam <NUM>. The first base <NUM>' may include a beam 31a'.

Referring to <FIG> and <FIG>, a motor assembly <NUM> may be installed in the second base <NUM>. Drive shaft of the motor assembly <NUM> may be formed in both sides. The right driving shaft and the left driving shaft of the motor assembly <NUM> may rotate in the same direction. Alternatively, the right driving shaft and the left driving shaft of the motor assembly <NUM> may rotate in opposite directions.

The motor assembly <NUM> may include a plurality of motors. The plurality of motors may be connected in series with each other. The motor assembly <NUM> may output a high torque by connecting a plurality of motors in series.

A lead screw <NUM> may be located in the left side and the right side of the motor assembly <NUM>, respectively. The motor assembly <NUM> may be connected to the lead screw <NUM>. A coupling <NUM> may connect the lead screw <NUM> and the drive shaft of the motor assembly <NUM>.

The lead screw <NUM> may be threaded along the longitudinal direction. The direction of the threads formed in the right lead screw <NUM> and the direction of the threads formed in the left lead screw <NUM> may be opposite to each other. The direction of the threads formed in the right lead screw <NUM> and the direction of the threads formed in the left lead screw <NUM> may be the same. The pitches of the left lead screw <NUM> and the right lead screw <NUM> may be the same.

The bearing 830a, 830b may be installed in the second base <NUM>. The bearing 830a, 830b may support both sides of the lead screw <NUM>. The bearing 830a, 830b may include an inner bearing 830b located close to the motor assembly <NUM> and an outer bearing 830a located far from the motor assembly <NUM>. The lead screw <NUM> may be stably rotated by the bearing 830a, 830b.

The slide <NUM> may be engaged with the lead screw <NUM>. The slide <NUM> may move forward or rearward in the longitudinal direction of the lead screw <NUM> according to the rotation of the lead screw <NUM>. The slide <NUM> may move between the outer bearing 830a and the inner bearing 830b. The slide <NUM> may be located in the left lead screw <NUM> and the right lead screw <NUM>, respectively. The left slide <NUM> may be engaged with the left lead screw <NUM>. The right slide <NUM> may be engaged with the right lead screw <NUM>.

The left slide <NUM> and the right slide <NUM> may be located symmetrically with respect to the motor assembly <NUM>. Due to the driving of the motor assembly <NUM>, the left slide <NUM> and the right slide <NUM> may move far away or approach from each other by the same distance.

Referring to <FIG>, the motor assembly <NUM> may include a plate <NUM>. The plate <NUM> may be referred to as a mount plate <NUM> or a motor mount plate <NUM>. A coupling portion <NUM> may be formed in an upper surface of second base <NUM>. The plate <NUM> may be fastened to the coupling portion <NUM> through a screw S. The motor assembly <NUM> may be spaced apart from the top surface of the second base <NUM>. A washer <NUM> may be located between the top surface of the plate <NUM> and the screw S. The washer <NUM> may include a rubber material. The washer <NUM> may reduce vibration generated in the motor assembly <NUM>. The washer <NUM> may improve driving stability of the display device <NUM>.

Referring to <FIG>, a guide rail <NUM> may be installed in the second base <NUM>. The guide rail <NUM> may be located in parallel with the lead screw <NUM>. The slide <NUM> may be engaged with the guide rail <NUM>. A first stopper 861b may be located in one side of the guide rail <NUM>, and a second stopper 861a may be located in the other side of the guide rail <NUM>. The range in which the slide <NUM> can move may be limited to between the first stopper 861b and the second stopper 861a.

A spring <NUM> may wrap the lead screw <NUM>. The lead screw <NUM> may penetrate the spring <NUM>. The spring <NUM> may be located between the inner bearing 830b and the slide <NUM>. One side of the spring <NUM> may contact the inner bearing 830b, and the other side of the spring <NUM> may contact the slide <NUM>. The spring <NUM> may provide an elastic force to the slide <NUM>.

When the slide <NUM> is caught in the first stopper 861b, the spring <NUM> may be maximally compressed. When the slide <NUM> is caught in the first stopper 861b, the length of the spring <NUM> may be minimized. When the slide <NUM> is caught in the first stopper 861b, the distance between the slide <NUM> and the inner bearing 830b may be minimized.

Referring to <FIG>, when the slide <NUM> is caught in the second stopper 861a, the spring <NUM> may be maximally tensioned. When the slide <NUM> is caught in the second stopper 861b, the length of the spring <NUM> may be maximized. When the slide <NUM> is caught in the second stopper 861a, the distance between the slide <NUM> and the inner bearing 830b may be maximized.

Referring to <FIG>, the first part 820a may be engaged with the guide rail <NUM>. The first part 820a may move along the guide rail <NUM>. Movement of the first part 820a in the longitudinal direction of the guide rail <NUM> may be restricted. The second part 820b may be located above the first part 820a. The first part 820a and the second part 820b may be fastened through a screw. The second part 820b may be spaced apart from the guide rail <NUM>. The lead screw <NUM> may penetrate the second part 820b. For example, the second part 820b may include a male thread that engages with a female thread of the lead screw <NUM>. Accordingly, even if the lead screw <NUM> is rotated, the slide <NUM> can be stably moved forward or rearward along the guide rail <NUM> without rotating.

The third part 820c may be coupled to one side of the second part 820b. The third part 820c may contact the spring <NUM>. The third part 820c may be provided with an elastic force from the spring <NUM>.

Referring to <FIG> and <FIG>, a link mount <NUM> may be installed in the second base <NUM>. One side of a second arm <NUM> may be pivotably connected to a link mount <NUM>. The other side of the second arm <NUM> may be pivotably connected to a joint <NUM>. The other side of the second arm <NUM> may be pivotably connected to a second axis 913b. One side of a rod <NUM> may be pivotably connected to the slide <NUM>. The other side of the rod <NUM> may be pivotably connected to the second arm <NUM> or a third arm <NUM>. One side of the third arm <NUM> may be pivotably connected to the link mount <NUM>. The other side of the third arm <NUM> may be pivotably connected to the other side of the rod <NUM>. The link mount <NUM> may include a shaft <NUM>. The second arm <NUM> or the third arm <NUM> may be pivotably connected to the shaft <NUM>.

A link bracket <NUM> may be referred to as a link cap <NUM>. The link bracket <NUM> may be coupled to a top case <NUM>. The top case <NUM> may be referred to as a case top <NUM>, an upper bar <NUM>, a top <NUM>, or a bar <NUM>. The top case <NUM> may be located in an upper end of the display unit <NUM>. The display unit <NUM> may be fixed to the top case <NUM>.

One side of a first arm <NUM> may be pivotably connected to the joint <NUM>. One side of the first arm <NUM> may be pivotably connected to a first shaft 913a. The other side of the first arm <NUM> may be pivotably connected to the link bracket <NUM> or the top case <NUM>.

A gear g1 may be formed in one side of the first arm <NUM>. A gear g2 may be formed in the other side of the second arm <NUM>. The gear g1 of the first arm <NUM> and the gear g2 of the second arm <NUM> may be engaged with each other.

When the slide <NUM> approaches the outer bearing 830a, the second arm <NUM> or the third arm <NUM> may stand up. At this time, the direction in which the second arm <NUM> or the third arm <NUM> stands may be referred to as a standing direction DRS.

The second arm <NUM> may include a protrusion <NUM> protruding in the standing direction DRS. The protrusion <NUM> may be referred to as a connection part <NUM>. The third arm <NUM> may include a protrusion <NUM> protruding in the standing direction DRS. The protrusion <NUM> may be referred to as a connection part <NUM>. The protrusion <NUM> of the second arm <NUM> and the protrusion <NUM> of the third arm <NUM> may face or contact each other. The other side of the rod <NUM> may be fastened to the protrusion <NUM> of the second arm <NUM> or the protrusion <NUM> of the third arm <NUM>.

A link <NUM> may include a first arm <NUM>, a second arm <NUM>, a third arm <NUM>, and/or a joint <NUM>.

Referring to <FIG> and <FIG>, an angle formed by the second arm <NUM> or the third arm <NUM> with respect to the second base <NUM> may be referred to as theta S. When the rod <NUM> is connected to the upper side of the second part 820b, an angle between the rod <NUM> and the second base <NUM> may be referred to as theta A, and the minimum force for the rod <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as Fa. When the rod <NUM> is connected to the middle of the second part 820b, an angle between the rod <NUM> and the second base <NUM> may be referred to as theta B, and the minimum force for the rod <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as Fb. When the rod <NUM> is connected to the lower side of the second part 820b, an angle between the rod <NUM> and the second base <NUM> may be referred to as theta C, and the minimum force for the rod <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as Fc.

A relationship of theta A <theta B <theta C can be established for the same theta S. In addition, a relationship of Fc <Fb <Fa may be established for the same theta S. If an angle formed by the second arm <NUM> or the third arm <NUM> with respect to the second base <NUM> is the same, the force required to stand up the second arm <NUM> or the third arm <NUM> can become smaller as the angle formed by the rod <NUM> and the second base <NUM> increases. The rod <NUM> may be connected to the lower side of the second part 820b to reduce the load applied on the motor assembly <NUM>.

Referring to <FIG>, the rod <NUM>' may not be connected to the protrusion of the second arm <NUM>' or the protrusion of the third arm <NUM>'. When the angle formed by the second arm <NUM>' or the third arm <NUM>' with respect to the second base <NUM> is theta S, the angle formed by the rod <NUM>' and the second base <NUM> is referred to as theta <NUM>, and the minimum force for the rod <NUM>' to stand up the second arm <NUM>' or the third arm <NUM>' may be referred to as F1.

Referring to <FIG>, the rod <NUM> may be connected to the protrusion <NUM> of the second arm <NUM> or the protrusion <NUM> of the third arm <NUM>. When the angle formed by the second arm <NUM> or the third arm <NUM> with respect to the second base <NUM> is theta S, the angle formed by the rod <NUM> and the second base <NUM> may be referred to as theta <NUM>, and the minimum force for the rod <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as F2.

Referring to <FIG>, when theta S is the same, theta <NUM> may be greater than theta <NUM>. If Theta S is the same, F1 can be greater than F2. If the angle formed by the second arm <NUM>, <NUM>' and the second base <NUM> is the same, the force required to stand up the second arm <NUM>, <NUM>' may become smaller as the angle formed by the rod <NUM>, <NUM>' and the second base <NUM> becomes larger. The rod <NUM> may be connected to the protrusion <NUM>, <NUM> to stand up the second arm <NUM> with less force than a case where the rod <NUM>' is not connected to the protrusion. The rod <NUM> may be connected to the <NUM>, <NUM> to reduce the load applied on the motor assembly <NUM>.

Referring to <FIG>, the second arm <NUM> or the third arm <NUM> may have a central axis CR. When the rod <NUM> is fastened to the second arm <NUM> by a distance r away from the central axis CR, the angle formed by the rod <NUM> and the second base <NUM> may be referred to as theta <NUM>, and the minimum force for the <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as F3. When the rod <NUM> is fastened to the second arm <NUM> by a distance r' away from the central axis CR, the angle formed by the rod <NUM> and the second base <NUM> may be referred to as theta <NUM>', and the minimum force for the rod <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as F4. When the rod <NUM> is fastened to the second arm <NUM> by a distance r" away from the central axis CR, the angle formed by the rod <NUM> and the second base <NUM> may be referred to as theta <NUM>", and the minimum force for the rod <NUM> to stand the second arm <NUM> or the third arm <NUM> may be referred to as F5.

Referring to <FIG>, when theta S is the same, theta <NUM>" may be greater than theta <NUM>', and theta <NUM>' may be greater than theta <NUM>. When theta S is the same, F3 may be greater than F4, and F4 may be greater than F5. As the rod <NUM> is fastened away from the central axis CR, the force required to stand the second arm <NUM> may be smaller. Since the rod <NUM> is fastened away from the central axis CR, the load on the motor assembly <NUM> may be reduced.

Referring to <FIG>, the first arm <NUM> and the second arm <NUM> may be in contact with or close to the rear surface of the display unit <NUM>. Since the first arm <NUM> and the second arm <NUM> are in contact with or close to the rear surface of the display unit <NUM>, the display unit <NUM> may be stably wound around or unwound from a roller. The link mount <NUM> may include a first part <NUM> and a second part <NUM>. The first part <NUM> and the second part <NUM> may face each other. A space S4 may be formed between the first part <NUM> and the second part <NUM>. The first part <NUM> may face the display unit <NUM>. The first part <NUM> may be located closer to the display unit <NUM> than the second part <NUM>. The second arm <NUM> may be pivotably connected to the front surface of the first part <NUM>. A part of the third arm <NUM> may be accommodated in the space S4 and pivotably connected to the first part <NUM> or the second part <NUM>.

Referring to <FIG>, the rod <NUM> may include a first part <NUM> and a second part <NUM>. The first part <NUM> may include a connection part 871a in one side thereof. The second part <NUM> of the slide <NUM> may form a space S5 therein. The connection part 871a may be inserted into the space S5. The connection part 871a may be pivotably connected to the second part 820b (see <FIG>) of the slide <NUM>. The other side of the first part <NUM> may be connected to one side of the second part <NUM>. The other side of the second part <NUM> may be pivotably connected to the second arm <NUM> or the third arm <NUM>. The first part <NUM> may form a space S3 therein. The first part <NUM> may include a hole 871b. The lead screw <NUM> may be accommodated in the hole 871b or the space S3.

The distance between the second part <NUM> and the display unit <NUM> may be D1. The second arm <NUM> may have a thickness W1. A portion of the third arm <NUM> accommodated in the space S4 may have a thickness W3. The thickness W3 may be equal to the distance between the first part <NUM> and the second part <NUM>. A portion of the third arm <NUM> that is not accommodated in the space S4 may have a thickness W2. The first part <NUM> may have a thickness W4. The thickness W2 may be greater than the thickness W3. The thickness W2 may be equal to the sum of the thickness W3 and the thickness W4. D1 may be the sum of the thickness W1 and the thickness W2.

The second arm <NUM> may be located in contact with or close to the rear surface of the display unit <NUM>, and the third arm <NUM> may be located between the second arm <NUM> and the second part <NUM>. The second part <NUM> can stably transmit power for standing the second arm <NUM> due to the third arm <NUM>. The second part <NUM> may be connected to the first part <NUM> by moving forward with respect to the axis of rotation of the lead screw <NUM>, so as to stably stand the second arm <NUM> or the third arm <NUM>. Thus, the play between the second arm <NUM> and the second part <NUM> may be minimized.

Referring to <FIG>, a pusher <NUM> may be installed in the link mount <NUM>. The pusher <NUM> may be referred to as a lifter <NUM>. A second part <NUM> may be fastened to the first part <NUM>. The second part <NUM> may be in contact with or separated from the link bracket <NUM>. The second part <NUM> may be made of a material having high elasticity. The first part <NUM> may be made of a material having a lower elasticity than the second part <NUM>. The first part <NUM> may be made of a material having a higher rigidity than the second part <NUM>. The first part <NUM> and the second part <NUM> may be collectively referred to as a head <NUM>. The head <NUM> may be located above the link mount <NUM>.

A third part <NUM> may be connected to the first part <NUM>. Alternatively, the third part <NUM> may be extended downward from the first part <NUM>. The third part <NUM> may be referred to as a tail <NUM>. A fourth part <NUM> may protrude from the third part <NUM>. The link mount <NUM> may form a space S6, and the third part <NUM> may be accommodated in the space S6. The space S6 may be opened upward. The space S6 in which the third part <NUM> is accommodated may be adjacent to the space S4 (see <FIG>) in which the third arm <NUM> is accommodated. The second part <NUM> of the link mount <NUM> may include a hole <NUM>. The hole <NUM> may be a long hole formed in the vertical direction. The length of the hole <NUM> may be H1. The fourth part <NUM> may be inserted into the hole <NUM>. The spring <NUM> may be accommodated in the space S6. The spring <NUM> may be located below the third part <NUM>. The spring <NUM> may provide an elastic force in the direction perpendicular to the third part <NUM>.

The head <NUM> may be greater than the diameter of the space S6. When the head <NUM> is caught in the upper end of the space S6, the height of the head <NUM> from the second base <NUM> may be minimized. The minimum height of the head <NUM> may be referred to as H2. When the height of the head <NUM> is minimized, the fourth part <NUM> may be caught in the lower end of the space S6. When the height of the head <NUM> is minimized, the spring <NUM> may be maximally compressed. When the height of the head <NUM> is minimized, the elastic force provided by the spring <NUM> may be maximized. When the height of the head <NUM> is minimized, the height of the top case <NUM> may be maximized.

The pusher <NUM> may provide elastic force to the link bracket <NUM>, while being in contact with the link bracket <NUM>. Thus, the load applied on the motor assembly <NUM> to stand up the link <NUM> may be reduced.

Referring to <FIG>, when the link <NUM> stands up sufficiently, the pusher <NUM> may be separated from the link bracket <NUM>. When the pusher <NUM> is separated from the link bracket <NUM>, the height of the head <NUM> from the second base <NUM> may be maximized. The maximum height of the head <NUM> may be referred to as H3. When the height of the head <NUM> is maximized, the fourth part <NUM> may be caught in the upper end of the hole <NUM> (see <FIG>). If the height of the head <NUM> is maximized, the spring <NUM> may be maximally tensioned. When the height of the head <NUM> is maximized, the elastic force provided by the spring <NUM> may be minimized. The maximum height H3 of the head <NUM> may be substantially equal to the sum of the minimum height H2 of the head <NUM> and the length H1 of the hole.

Referring to <FIG>, the display unit <NUM> may be in a state of being maximally wound around the roller <NUM>. The display device <NUM> may be symmetrical with respect to the motor assembly <NUM>. The height of the top case <NUM> may be minimized. The slide <NUM> may be in a position closest to the inner bearing 830b. The slide <NUM> may be in a state of being caught in the first stopper 861b. The spring <NUM> may be in a maximally compressed state. The pusher <NUM> may be in contact with the link bracket <NUM>. The height of the pusher <NUM> may be minimized.

Referring to <FIG>, about half of the display unit <NUM> may be in a state of being wound around the roller <NUM>. The display device <NUM> may be symmetrical with respect to the motor assembly <NUM>. About half of the display unit <NUM> may be in a state of being unwound from the roller <NUM>. The slide <NUM> may be located between the first stopper 861b and the second stopper 861a. The pusher <NUM> may be separated from the link bracket <NUM>. The height of the pusher <NUM> may be maximized.

Referring to <FIG>, the display unit <NUM> may be in a state of being maximally unwound from the roller <NUM>. The display device <NUM> may be symmetrical with respect to the motor assembly <NUM>. The height of the top case <NUM> may be maximized. The slide <NUM> may be in a position closest to the outer bearing 830a. The slide <NUM> may be in a state of being caught in the second stopper 861a. The spring <NUM> may be in a state of maximum tension. The pusher <NUM> may be separated from the link bracket <NUM>. The height of the pusher <NUM> may be maximized.

Referring to <FIG>, a link mount 920a, 920b may be installed in the base <NUM>. The link mount 920a, 920b may include a right link mount 920a spaced to the right from a first right bearing 830a and a left link mount 920b spaced to the left from a second left bearing 830d.

A link 910a, 910b may be connected to the link mount 920a, 920b. The link 910a, 910b may include a right link 910a connected to the right link mount 920a and a left link 910b connected to the left link mount 920b.

The right link 910a may be referred to as a first link. The left link 910b may be referred to as a second link. The right link mount 920a may be referred to as a first link mount 920a. The left link mount 920b may be referred to as a second link mount 920b.

The link 910a, 910b may include a first arm 911a, 911b, a second arm 912a, 912b, and an arm joint 913a, 913b. One side of the second arm 912a, 912b may be rotatably connected to the link mount 920a, 920b. The other side of the second arm 912a, 912b may be rotatably connected to the arm joint 913a, 913b. One side of the first arm 911a, 911b may be rotatably connected to the arm joint 913a, 913b. The other side of the first arm 911a, 911b may be rotatably connected to the link bracket 951a, 951b.

The link bracket 951a, 951b may include a right link bracket 951a connected to the first arm 911a of the right link 910a and a left link bracket 951b connected to the first arm 911b of the left link 910b. The link bracket 951a, 951b may be connected to the upper bar <NUM>.

The upper bar <NUM> may connect the right link bracket 951a and the left link bracket 951b.

A rod 870a, 870b may connect a slider 860a, 860b to the link 910a, 910b. One side of the rod 870a, 870b may be rotatably connected to the slider 860a, 860b. The other side of the rod 870a, 870b may be rotatably connected to the second arm 912a, 912b. The rod 870a, 870b may include a right rod 870a connecting the right slider 860a and the second arm 912a of the right link 910a and a left rod 870b connecting the left slider 860b and the second arm 912b of the left link 910b. The right rod 870a may be referred to as a first rod 870a. The left rod 870b may be referred to as a second rod 870b.

Specifically, a structure formed by a right lead screw 840a, the right slider 860a, the right rod 870a, and the right link 910a will be described. The right slider 860a may include a body 861a and a rod mount 862a. The body 861a may have a thread SS formed on an inner circumferential surface thereof. The thread formed in the body 861a may be engaged with the thread RS of the right lead screw 840a. The right lead screw 840a may penetrate the body 861a.

The rod mount 862a may be formed in the right side of the body 861a. The rod mount 862a may be rotatably connected to one side of the right rod 870a. The rod mount 862a may include a first rod mount 862a1 and a second rod mount 862a2. The first rod mount 862a1 may be disposed in front of the right lead screw 840a. The second rod mount 862a2 may be disposed behind the right lead screw 840a. The first rod mount 862a1 and the second rod mount 862a2 may be spaced apart from each other. The second rod mount 862a2 may be spaced apart from the first rod mount 862a1 in the -z axis direction. The right lead screw 840a may be located between the first rod mount 862a1 and the second rod mount 862a2.

The rod mount 862a may be rotatably connected to one side of the rod 870a through a connecting member C1. The connecting member C1 may penetrate the rod mount 862a and the right rod 870a.

The right rod 870a may be rotatably connected to a second arm 912a through a connecting member C2. The connecting member C2 may penetrate the second arm 912a and the right rod 870a.

The right rod 870a may include a transmission part 871a connected to the second arm 912a of the right link 910a and a cover 872a connected to the rod mount 862a of the right slider 860a. The transmission part 871a may transmit a force, which is generated as the right slider 860a moves forward or rearward along the right lead screw 840a, to the right link 910a.

The cover 872a may include a first plate 873a disposed in front of the right lead screw 840a. The first plate 873a may be disposed perpendicular to the base <NUM>. Alternatively, the first plate 873a may face the right lead screw 840a.

The cover 872a may include a second plate 874a disposed behind the right lead screw 840a. The second plate 874a may be disposed perpendicular to the base <NUM>. Alternatively, the second plate 874a may face the right lead screw 840a. Alternatively, the second plate 874a may be spaced apart from the first plate 873a. The right lead screw 840a may be located between the first plate 873a and the second plate 874a.

The cover 872a may include a third plate 875a connecting the first plate 873a and the second plate 874a. The third plate 875a may be connected to the transmission part. The third plate 875a may be located above the right lead screw 840a.

The cover 872a may include a fourth plate 876a connecting the first plate 873a and the second plate 874a. The fourth plate 876a may be connected to the third plate 875a. The fourth plate 876a may be located above the right lead screw 840a.

One side of the first plate 873a may be connected to the first rod mount 862a1. The first plate 873a and the first rod mount 862a1 may be connected through the connecting member C1'. The other side of the first plate 873a may be connected to the third plate 875a.

One side of the second plate 874a may be connected to the second rod mount 862a2. The second plate 874a and the second rod mount 862a2 may be connected through the connecting member C1. The other side of the second plate 874a may be connected to the third plate 875a.

When the right slider 860a is moved closer to the motor assembly <NUM>, the right lead screw 840a and the right rod 870a may be in contact with each other. When the right lead screw 840a and the right rod 870a contact each other, mutual interference may occur and the movement of the right slider 860a may be restricted.

The cover 872a may provide a space S1 therein. The first plate 873a, the second plate 874a, the third plate 875a, and the fourth plate 876a may form the space S1. When the right slider 860a is moved closer to the motor assembly <NUM>, the right lead screw 840a may be accommodated or escaped into the space S1 provided by the cover 872a. The right slider 860a may move closer to the motor assembly <NUM> than a case of not having the cover 872a, due to the space S1 provided by the cover 872a. That is, the cover 872a may expand the movable range of the right slider 860a by providing the space S1 therein. In addition, since the right lead screw 840a is accommodated in the cover 872a, the size of the housing <NUM> (see <FIG>) can be reduced.

In addition, the cover 872a may limit the minimum value of the angle theta S formed between the second arm 912a and the base <NUM>. The third plate 875a of the cover 872a may contact the second arm 912a and may support the second arm 912a, when theta S is sufficiently small. By supporting the second arm 912a, the third plate 875a may limit the minimum value of theta S and prevent sagging of the second arm 912a. That is, the cover 872a may serve as a stopper for preventing sagging of the second arm 912a. In addition, the third plate 875a may reduce the initial load for standing the second arm 912a by limiting the minimum value of theta S.

The lead screw 840a, 840b may be driven by a single motor assembly <NUM>. The lead screw 840a, 840b is driven by a single motor assembly <NUM>, so that the second arm 912a, 912b can stand up in symmetry. However, when driving the lead screw 840a, 840b by a single motor assembly <NUM>, the load on the motor assembly <NUM> to stand the second arm 912a, 912b may be excessively increased. At this time, the third plate 875a may reduce the load on the motor assembly <NUM> to stand the second arm 912a, 912b, by limiting the minimum value of theta S.

The structure formed by the left lead screw 840b, the left slider 860b, the left rod 870b, and the left link 910b may be symmetric with the structure formed by the right lead screw 840a, the right slider 860a, the right rod 870a, and the right link 910a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly <NUM>.

Referring to <FIG>, a guide 850a, 850b, 850c, 850d may be connected to the bearing 830a, 830b, 830c, and 830d. The guide 850a, 850b, 850c, 850d may include a right guide 850a, 850b disposed in the right side of the motor assembly <NUM> and a left guide 850c, 850d disposed in the left side of the motor assembly <NUM>.

The right guide 850a, 850b may have one side connected to a first right bearing 830a and the other side connected to a second right bearing 830b. The right guide 850a, 850b may be located in parallel with the right lead screw 840a. Alternatively, the right guide 850a, 850b may be spaced apart from the right lead screw 840a.

The right guide 850a, 850b may include a first right guide 850a and a second right guide 850b. The first right guide 850a and the second right guide 850b may be spaced apart from each other. The right lead screw 840a may be located between the first right guide 850a and the second right guide 850b.

The right slider 860a may include a protrusion. Alternatively, the display device may include a protrusion formed in the right slider 860a. The protrusion may be formed in the body of the slider. The protrusion may include a front protrusion (not shown) protruded in the + z-axis direction from the body 861a of the right slider 860a and a rear protrusion 865a protruded in the -z-axis direction from the body of the slider.

The first right guide 850a may penetrate the rear protrusion 865a. Alternatively, it may include a first hole 863a formed in the rear protrusion, and the first right guide 850a may penetrate the first hole 863a. The first hole 863a may be formed in the x-axis direction. The first hole 863a may be referred to as a hole 863a.

The second right guide (not shown) may penetrate the front protrusion (not shown). Alternatively, it may include a second hole (not shown) formed in the front protrusion, and the second right guide may penetrate the second hole. The second hole may be formed in the x-axis direction.

The right guide 850a, 850b may guide the right slider 860a to move more stably when the right slider 860a moves forward or rearward along the right lead screw 840a. As the right guide 850a, 850b stably guides the right slider 860a, the right slider 860a can move forward or rearward along the right lead screw 840a while not rotating with respect to the right lead screw 840a.

The structure formed by the left guide 850c, 850d, the left bearing 830a, 830b, 830c, and 830d, the left slider 860b, and the left lead screw 840b may be symmetrical with the structure formed by the right guide 850a, 850b, the right bearing 830a, 830b, 830c, and 830d, the right slider 860a, and the right lead screw 840a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly <NUM>.

Referring to <FIG>, a first spring 841a, 841b may be inserted into the lead screw 840a, 840b. Alternatively, the lead screw 840a, 840b may penetrate the first spring 841a, 841b. The first spring 841a, 841b may include a first right spring 841a disposed in the right side of the motor assembly <NUM> and a first left spring 841b disposed in the left side of the motor assembly <NUM>.

The first right spring 841a may be disposed between the right slider 860a and the second right bearing 830b. One end of the first right spring 841a may be in contact with or separated from the right slider 860a. The other end of the first right spring 841a may be in contact with or separated from the second right bearing 830b.

When the second arm 912a is fully laid with respect to the base <NUM>, the distance between the right slider 860a and the second right bearing 830b may be a distance RD3. The first right spring 841a may have a length greater than the distance RD3 in the state of not being compressed or tensioned. Thus, when the second arm 912a is fully laid with respect to the base <NUM>, the first right spring 841a may be compressed between the right slider 860a and the second right bearing 830b. Then, the first right spring 841a may provide a restoring force to the right slider 860a in the + x axis direction.

When the second arm 912a changes from a fully laid state to a standing state with respect to the base <NUM>, the restoring force provided by the first right spring 841a may assist the second arm 912a to stand up. As the first right spring 841a assists the second arm 912a to stand up, the load on the motor assembly <NUM> may be reduced.

The lead screw 840a, 840b may be driven by a single motor assembly <NUM>. As the lead screw 840a, 840b is driven by a single motor assembly <NUM>, the second arm 912a, 912b can stand up in symmetry. However, when the lead screw 840a, 840b is driven by a single motor assembly <NUM>, the load on the motor assembly <NUM> to stand the second arm 912a, 912b may be excessively increased. At this time, the first right spring 841a assists the second arm 912a to stand up, so that the load on the motor assembly <NUM> can be decreased, and the load on the motor assembly <NUM> to stand the second arm 912a can be reduced.

Alternatively, when the second arm 912a changes from the standing state to the fully laid state with respect to the base <NUM>, the restoring force provided by the first right spring 841a can alleviate the shock that occurs when the second arm 912a is laid with respect to the base <NUM>. That is, the first right spring 841a may serve as a damper when the second arm 912a is laid with respect to the base <NUM>. As the first right spring 841a serves as a damper, the load of the motor assembly <NUM> may be reduced.

The structure formed by the first left spring 841b, the left bearing 830a, 830b, 830c, and 830d, the left slider 860b, the left lead screw 840b, and the second arm 912a may be symmetrical with the structure formed by the first right spring 841a, the right bearing 830a, 830b, 830c, and 830d, the right slider 860a, the right lead screw 840a, and the second arm 912a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly <NUM>.

Referring to <FIG>, the second spring 851a, 851b may be inserted into the guide 850a, 850b, 850c, 850d. Alternatively, the guide 850a, 850b, 850c, 850d may penetrate the second spring 851a, 851b. The second spring 851a, 851b may include a second right spring 851a disposed in the right side of the motor assembly <NUM> and a second left spring 851b disposed in the left side of the motor assembly <NUM>.

A plurality of second right springs 851a may be formed. The second right spring 851a may include a spring 940a, 940b inserted into the first right guide 850a and a spring 940a, 940b inserted into the second right guide 850b. Alternatively, the second right spring 851a may include a spring 940a, 940b through which the first right guide 850a passes and a spring 940a, 940b through which the second right guide 850b passes.

The guide 850a, 850b, 850c, 850d may include a locking jaw 852a, 852b. The locking jaw 852a, 852b may include a right locking jaw 852a disposed in the right side of the motor assembly <NUM> and a left locking jaw 852b disposed in the left side of the motor assembly <NUM>.

The right locking jaw 852a may be disposed between the right slider 860a and the second right bearing 830b. The second right spring 851a may be disposed between the right slider 860a and the second right bearing 830b. One end of the second right spring 851a may be in contact with or separated from the right slider 860a. The other end of the second right spring 851a may be in contact with or separated from the right locking jaw 852a.

When the second arm 912a is fully laid with respect to the base <NUM>, the distance between the right slider 860a and the right locking jaw 852a may be a distance RD4. The second right spring 851a may have a length greater than the distance RD4 in the state of being not compressed or tensioned. Thus, when the second arm 912a is fully laid with respect to the base <NUM>, the second right spring 851a may be compressed between the right slider 860a and the right locking jaw 852a. The second right spring 851a may provide a restoring force to the right slider 860a in the + x axis direction.

When the second arm 912a changes from the fully laid state to the standing state with respect to the base <NUM>, the restoring force provided by the second right spring 851a may assist the second arm 912a to stand up. As the second right spring 851a assists the second arm 912a to stand, the load on the motor assembly <NUM> can be reduced.

The lead screw 840a, 840b may be driven by a single motor assembly <NUM>. As the lead screw 840a, 840b is driven by a single motor assembly <NUM>, the second arm 912a, 912b may stand up in symmetry. However, when the lead screw 840a, 840b is driven by a single motor assembly <NUM>, the load on the motor assembly <NUM> to stand the second arm 912a, 912b may be excessively increased. At this time, the second right spring 851a may assist the second arm 912a to stand up so that the load on the motor assembly <NUM> can be decreased, thereby reducing the load on the motor assembly <NUM> to stand the second arm 912a.

Alternatively, when the second arm 912a changes from the standing state to the fully laid state with respect to the base <NUM>, the restoring force provided by the second right spring 851a can alleviate the shock that occurs when the second arm 912a is laid with respect to the base <NUM>. That is, the second right spring 851a may serve as a damper when the second arm 912a is laid with respect to the base <NUM>. As the second right spring 851a serves as a damper, the load of the motor assembly <NUM> may be reduced.

The structure formed by the second left spring 851b, the left locking jaw 852b, the left slider 860b, the left guide 850c, 850d, and the second arm 912a may be symmetric with the structure formed by the above-described second right spring 851a, the right locking jaw 852a, the right slider 860a, the right guide 850a, 850b, and the second arm 912a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly <NUM>.

Referring to <FIG>, the second arm 912a may stand up by receiving a restoring force from the first right spring 841a and the second right spring 851a.

An angle formed by the second arm 912a with respect to the base <NUM> may be referred to as an angle theta S. The angle formed by the right rod 870a with respect to the base <NUM> may be referred to as an angle theta T. The force applied by the motor assembly <NUM> for moving the right slider 860a in the + x-axis direction may be referred to as FA. The force exerted on the right slider 860a by the first right spring 841a may be referred to as FB. The force exerted on the right slider 860a by the second right spring 851a may be referred to as FC. The force transmitted by the right rod 870a to the second arm 912a may be referred to as FT.

When the second arm 912a is fully laid with respect to the base <NUM>, the angle theta S and the angle theta T may have minimum values. When the second arm 912a changes from the fully laid state to the standing state with respect to the second base <NUM>, the angle theta S and the angle theta T may be gradually increased.

When the second arm 912a is fully laid with respect to the base <NUM>, the first right spring 841a may be compressed. The compressed first right spring 841a may provide restoring force FB to the right slider 860a. The restoring force FB may act in the + x direction. When the second arm 912a is fully laid with respect to the base <NUM>, the compression displacement amount of the first right spring 841a may be maximized, and the magnitude of the restoring force FB may have a maximum value. When the second arm 912a changes from the fully laid state to the standing state with respect to the base <NUM>, the compression displacement amount of the first right spring 841a may be gradually decreased, and the magnitude of the restoring force FB may be gradually decreased.

When the second arm 912a is fully laid with respect to the base <NUM>, the second right spring 851a may be compressed. The compressed second right spring 851a may provide restoring force FC to the right slider 860a. The restoring force FC may act in the + x direction. When the second arm 912a is fully laid with respect to the base <NUM>, the compression displacement amount of the second right spring 851a may be maximized, and the magnitude of the restoring force FC may have a maximum value. When the second arm 912a changes from the fully laid state to the standing state with respect to the base <NUM>, the compression displacement amount of the second right spring 851a may be gradually decreased, and the magnitude of the restoring force FC may be gradually decreased.

The force FT that the right rod 870a transmits to the second arm 912a may be a summed force of the force FA applied by the motor assembly <NUM> for moving the right slider 860a in the + x-axis direction, the restoring force FB of the first right spring 841a, and the restoring force FC of the second right spring 851a.

When the second arm 912a starts to stand up in the state where the second arm 912a is fully laid with respect to the base <NUM>, the load of the motor assembly <NUM> may be maximized. At this time, the magnitude of the restoring force FB provided by the first right spring 841a may be maximized. In addition, the magnitude of the restoring force FC provided by the second spring 851a, 851b may be maximized.

When the second arm 912a changes from the fully laid state to the standing state with respect to the base <NUM>, the restoring force provided by the first right spring 841a and the second right spring 851a may assist to stand the second arm 912a. As the first right spring 841a and the second right spring 851a assist the second arm 912a to stand, the load of the motor assembly <NUM> can be reduced.

The first right spring 841a and the second right spring 851a may simultaneously provide the restoring force (the summed force of the restoring force FB and the restoring force FC) to the right slider 860a. The restoring force (the summed force of the restoring force FB and the restoring force FC) may be provided to the right slider 860a until the distance RD5 between the right slider 860a and the right locking jaw 852a becomes equal to the length of the second right spring 851a.

When the distance RD5 between the right slider 860a and the right locking jaw 852a is equal to the length of the second right spring 851a, the compression displacement amount of the second right spring 851a may become zero. When the compression displacement amount of the second right spring 851a is zero, the restoring force FC provided by the second right spring 851a to the right slider 860a may be zero.

When the distance RD5 between the right slider 860a and the right locking jaw 852a is greater than the length of the second right spring 851a, only the first right spring 841a may provide the restoring force FB to the right slider 860a. The restoring force FB may be provided to the right slider 860a until the distance RD6 between the right slider 860a and the second right bearing 830b becomes equal to the length of the first right spring 841a.

When the distance RD6 between the right slider 860a and the second right bearing 830b is equal to the length of the first right spring 841a, the compression displacement amount of the first right spring 841a may be zero. When the compression displacement amount of the first right spring 841a becomes zero, the restoring force FB provided by the first right spring 841a to the right slider 860a may be zero.

When the distance RD6 between the right slider 860a and the second right bearing 830b is greater than the length of the first right spring 841a, the motor assembly <NUM> may stand the second arm 912a without receiving the restoring force from the first right spring 841a or the second right spring 851a.

The structure formed by the first left spring 841b, the second left spring 851b, the left locking jaw 852b, the left slider 860b, the left guide 850c, 850d, the left lead screw 840b, the left rod 870b, and the second arm 912a may be symmetrical with the structure formed by the first right spring 841a, the second right spring 851a, the right locking jaw 852a, the right slider 860a, the right guide 850a, 850b, the right lead screw 840a, the right rod 870a, and the second arm 912a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly <NUM>.

Referring to <FIG>, the pusher 930a, 930b may be connected to the link mount 920a, 920b. The pusher 930a, 930b may include a right pusher 930a disposed in the right side of the motor assembly <NUM> and a left pusher 930b disposed in the left side of the motor assembly <NUM>.

The link mount 920a, 920b may form an accommodation space A. The accommodation space A may accommodate the spring 940a, 940b and the pusher 930a, 930b. The spring 940a, 940b may include a right spring 940a disposed in the right side of the motor assembly <NUM> and a left spring 940b disposed in the left side of the motor assembly <NUM>. The accommodation space A may be referred to as an internal space A.

The link mount 920a, 920b may include a first hole 922a connecting the accommodation space A and an external space (the first hole corresponding to 920b is not shown). The first hole 922a may be formed in the upper surface of the link mount 920a, 920b. The first hole 922a may be referred to as a hole 922a.

The pusher 930a, 930b may be located perpendicular to the base <NUM>. Alternatively, the pusher 930a, 930b may be disposed parallel to the y axis. The spring 940a, 940b may be located perpendicular to the base <NUM>. Alternatively, the spring 940a, 940b may be disposed parallel to the y axis.

The pusher 930a, 930b may include a first part 931a, 931b and a second part 932a, 932b. The second part 932a, 932b may be connected to the lower side of the first part 931a, 931b. The lower end of the second part 932a, 932b may be connected to the spring 940a, 940b. All or part of the second part 932a, 932b may be accommodated in the accommodation space A formed by the link mount 920a, 920b. The second part 932a, 932b may have a diameter equal to the diameter of the first hole 922a or may have a diameter less than the diameter of the first hole 922a. The second part 932a, 932b may penetrate the first hole 922a.

The first part 931a, 931b may be located outside the link mount 920a, 920b. Alternatively, the first part 931a, 931b may be located outside the accommodation space A of the link mount 920a, 920b. The first part 931a, 931b may have a diameter greater than the diameter of the first hole 922a.

The first part 931a, 931b may be in contact with or spaced apart from the link bracket 951a, 951b. For example, when the second arm 912a, 912b is fully laid with respect to the base <NUM>, the first part 931a, 931b may be in contact with the link bracket 951a, 951b. Alternatively, when the second arm 912a, 912b fully stands up with respect to the base <NUM>, the first part 931a, 931b may be spaced apart from the link bracket 951a, 951b.

When the first part 931a, 931b is in contact with the link bracket 951a, 951b, the pusher 930a, 930b may receive a force from the link bracket 951a, 951b. The force applied to the pusher 930a, 930b may be in a downward direction. Alternatively, the force applied to the pusher 930a, 930b may be in the -y axis direction. Alternatively, the link bracket 951a, 951b may press the pusher 930a, 930b. The direction in which the link bracket 951a, 951b presses the pusher 930a, 930b may be downward. Alternatively, the direction in which the link bracket 951a, 951b presses the pusher 930a, 930b may be in the -y axis direction.

When the first part 931a, 931b is applied with a force, the spring 940a, 940b may be compressed. The compressed spring 940a, 940b may provide restoring force to the pusher 930a, 930b. The direction of the restoring force may be opposite to the direction of the force applied to the first part 931a, 931b. Alternatively, the restoring force may act in the + y-axis direction.

The link mount 920a, 920b may include a second hole 921a (the second hole corresponding to 920b is not shown). The second hole 921a may connect the accommodation space A and the external space. All or part of the spring 940a, 940b may be exposed to the outside through the second hole 921a. All or part of the pusher 930a, 930b may be exposed to the outside through the second hole 921a. In the maintenance or repair of the display device, a service provider may check the operating state of the pusher 930a, 930b through the second hole 921a. The second hole 921a may provide a service provider with convenience of maintenance or repair.

Referring to <FIG>, the right link 910a may stand up by receiving the restoring force from the right pusher 930a. It will be described based on the right link 910a.

An angle formed by the second arm 912a with respect to the base <NUM> may be referred to as an angle theta S. The force transmitted by the right rod 870a to the second arm 912a may be referred to as FT. The force transmitted by the right pusher 930a to the right link bracket 951a may be referred to as FP.

Referring to <FIG>, when the second arm 912a is fully laid with respect to the base <NUM>, the angle theta S may have a minimum value. The right spring 940a connected to the right pusher 930a may be compressed maximally, and the magnitude of the restoring force FP may have a maximum value. The compressed right spring 940a may provide restoring force FP to the right pusher 930a. The right pusher 930a may transmit the restoring force FP to the right link bracket 951a. The restoring force FP can act in the + y-axis direction.

If the second arm 912a is fully laid with respect to the base <NUM>, the distance HL from the base <NUM> to the upper end of the right pusher 930a may have a minimum value. The first part 931a of the right pusher 930a may protrude to the outside of the right link mount 920a, and the second part 932a of the right pusher 930a may be fully accommodated in the accommodation space 923a of the right link mount 920a.

Referring to <FIG>, when the second arm 912a changes from the fully laid state to the standing state with respect to the base <NUM>, the angle theta S may gradually increase. The compression displacement amount of the right spring 940a may gradually decrease, and the magnitude of the restoring force FP may gradually decrease.

As the angle theta S gradually increases, at least a part of the second part 932a of the right pusher 930a may protrude to the outside of the right link mount 920a. The length by which the second part 932a of the right pusher 930a protrudes to the outside of the right link mount 920a may be referred to as a length HP. The distance HL from the base <NUM> to the upper end of the right pusher 930a may increase by HP than a case where the second arm 912a is fully laid with respect to the base <NUM>.

Referring to <FIG>, when the second arm 912a stands up with respect to the base <NUM>, the right pusher 930a and the right link bracket 951a may be separated from each other. The compression displacement amount of the right spring 940a may be zero. When the compression displacement amount of the right spring 940a becomes zero, the restoring force FP provided by the right pusher 930a to the right link bracket 951a may be zero.

In addition, the length HP by which the second part 932a of the right pusher 930a protrudes to the outside of the right link mount 920a may have a maximum value. The distance HL from the base <NUM> to the upper end of the right pusher 930a may have a maximum value.

That is, the right pusher 930a may assist the second arm 912a to stand and reduce the load of the motor assembly <NUM> by applying a restoring force to the right link bracket 951a, while the right pusher 930a and the right link bracket 951a are in contact with each other.

The lead screw 840a, 840b may be driven by a single motor assembly <NUM>. As the lead screw 840a, 840b is driven by a single motor assembly <NUM>, the second arm 912a, 912b can stand up in symmetry. However, when the lead screw 840a, 840b is driven by a single motor assembly <NUM>, the load on the motor assembly <NUM> to stand the second arm 912a, 912b may be excessively increased. At this time, the right pusher 930a may apply the restoring force to the right link bracket 951a, thereby assisting the second arm 912a to stand up and reducing the load of the motor assembly <NUM>.

Alternatively, when the second arm 912a changes from the standing state to the fully laid state with respect to the base <NUM>, the restoring force that the right pusher 930a provides to the right link bracket 951a can alleviate the shock that occurs when the link 910a is laid with respect to the base <NUM>. That is, the restoring force provided by the right pusher 930a to the right link bracket 951a may serve as a damper when the link 910a is laid with respect to the base <NUM>. As the right pusher 930a serves as a damper, the load of the motor assembly <NUM> may be reduced.

The structure formed by the left pusher 930b, the left spring 940b, the left link bracket 951b, the left link mount 920b, and the left rod 870b may be symmetric with the structure formed by the right pusher 930a, the right spring 940a, the right link bracket 951a, the right link 910a mount, and the right rod 870a. In this case, the axis of symmetry may be the axis of symmetry of the motor assembly <NUM>.

Referring to <FIG>, the panel roller <NUM> may be installed in the base <NUM>. The panel roller <NUM> may be installed in front of the lead screw 840a, 840b. Alternatively, the panel roller <NUM> may be disposed in parallel with the length direction of the lead screw 840a, 840b. Alternatively, the panel roller <NUM> may be spaced apart from the lead screw 840a, 840b.

The display unit <NUM> may include a display panel <NUM> and a module cover <NUM>. The lower side of the display unit <NUM> may be connected to the panel roller <NUM>, and the upper side of the display unit <NUM> may be connected to the upper bar <NUM>. The display unit <NUM> may be wound around or unwound from the panel roller <NUM>.

The distance from the axis of symmetry ys of the motor assembly <NUM> to the right slider 860a may be referred to as a distance RD. The distance from the axis of symmetry ys of the motor assembly <NUM> to the left slider 860b may be referred to as a distance LD. The distance between the right slider 860a and the left slider 860b may be referred to as a distance SD. The distance SD may be the sum of the distance RD and the distance LD. The distance from the base <NUM> to the upper end of the display unit <NUM> may be referred to as a distance HD.

Referring to <FIG>, when the second arm 912a, 912b is fully laid with respect to the base <NUM>, the distance SD between the right slider 860a and the left slider 860b may have a minimum value. The distance RD from the axis of symmetry ys of the motor assembly <NUM> to the right slider 860a may be the same as the distance LD from the axis of symmetry ys of the motor assembly <NUM> to the left slider 860b.

When the second arm 912a, 912b is fully laid with respect to the base <NUM>, the distance HD from the base <NUM> to the upper end of the display unit <NUM> may have a minimum value.

When the second arm 912a, 912b is fully laid with respect to the base <NUM>, the first spring 841a, 841b may contact the slider 860a, 860b. In addition, the second spring 851a, 851b may contact the slider 860a, 860b. In addition, the pusher 930a, 930b may contact the link bracket 951a, 951b.

When the second arm 912a, 912b is fully laid with respect to the base <NUM>, the amount of compression of the first spring 841a, 841b may have a maximum value, and the magnitude of the restoring force provided to the slider 860a, 860b by the first spring 841a, 841b may have a maximum value.

When the second arm 912a, 912b is fully laid with respect to the base <NUM>, the amount of compression of the second spring 851a, 851b may have a maximum value, and the magnitude of the restoring force provided to the slider 860a, 860b by the second spring 851a, 851b may have a maximum value.

When the second arm 912a, 912b is fully laid with respect to the base <NUM>, the amount of compression of the spring 940a, 940b may have a maximum value, and the magnitude of the restoring force provided to the pusher 930a, 930b by the spring 940a, 940b may have a maximum value.

When the second arm 912a, 912b start to stand with respect to the base <NUM>, the second arm 912a, 912b may stand by receiving a restoring force from the first spring 841a, 841b, the second spring 851a, 851b, and the spring 940a, 940b. Thus, the load on the motor assembly <NUM> may be reduced.

Referring to <FIG>, as the second arm 912a, 912b stands with respect to the base <NUM>, the distance SD between the right slider 860a and the left slider 860b may gradually increase. Even if the distance SD increases, the distance LD and the distance RD may be equal to each other. That is, the right slider 860a and the left slider 860b may be symmetrically located with respect to the axis of symmetry ys of the motor assembly <NUM>. In addition, the extent to which the second arm 912a, 912b of the right link 910a stands with respect to the base <NUM> and may be equal to the extent to which the second arm 912a, 912b of the left link 910b stands with respect to the base <NUM>.

As the second arm 912a, 912b stands with respect to the base <NUM>, the distance HD from the base <NUM> to the upper end of the display unit <NUM> may gradually increase. The display unit <NUM> may be unwound from the panel roller <NUM>. Alternatively, the display unit <NUM> may be unfolded from the panel roller <NUM>.

When the second arm 912a, 912b fully stands up with respect to the base <NUM>, the first spring 841a, 841b may be separated from the slider 860a, 860b. In addition, when the second arm 912a, 912b fully stands up with respect to the base <NUM>, the second spring 851a, 851b may be separated from the slider 860a, 860b. In addition, when the second arm 912a, 912b stands up with respect to the base <NUM>, the pusher 930a, 930b may be separated from the link bracket 951a, 951b.

The separation of the first spring 841a, 841b from the slider 860a, 860b, the separation of the second spring 851a, 851b from the slider 860a, 860b, and the separation of the pusher 930a, 930b from the link bracket 951a, 951b may proceed independently of each other. That is, the order of the separation of the first spring 841a, 841b from the slider 860a, 860b, the separation of the second spring 851a, 851b from the slider 860a, 860b, and the separation of the pusher 930a, 930b from the link bracket 951a, 951b may be mutually variable.

The angle formed between the axis xs1 parallel to the base <NUM> and the second arm 912a may be referred to as theta R. The angle formed between the axis xs1 parallel to the base <NUM> and the first arm 911a may be referred to as theta R'. The axis xs1 and x-axis may be parallel.

When the second arm 912a is fully laid with respect to the base <NUM>, or while the second arm 912a stands up with respect to the base <NUM>, or when the standing of the second arm 912a with respect to the base <NUM> is completed, theta R and theta R' can be maintained to be the same.

The angle formed between the axis xs2 parallel to the base <NUM> and the second arm 912b may be referred to as theta L. The angle formed between the axis xs2 parallel to the base <NUM> and the first arm 911b may be referred to as theta L'. The axis xs2 and x-axis may be parallel.

When the second arm 912b is fully laid with respect to the base <NUM>, or while the second arm 912b stands up with respect to the base <NUM>, or when the standing of the second arm 912a with respect to the base <NUM> is completed, theta L and theta L' can be maintained to be the same.

The axis xs1 and the axis xs2 may be the same axis mutually.

Referring to <FIG>, when the second arm 912a, 912b fully stands up with respect to the base <NUM>, the distance SD between the right slider 860a and the left slider 860b may have a maximum value. Even when the distance SD is maximized, the distance LD and the distance RD may be equal to each other.

When the second arm 912a, 912b fully stands up with respect to the base <NUM>, the distance HD from the base <NUM> to the upper end of the display unit <NUM> may have a maximum value.

Referring to <FIG> and <FIG>, the module cover <NUM> may be coupled to the rear surface of the display panel <NUM>. The module cover <NUM> may include a plurality of segments 15b, 15d, and 15e extending long in the leftward-rightward direction of the display panel <NUM>. The plurality of segments 15b, 15d, and 15e may be sequentially fixed to the rear surface of the display panel <NUM> in the upward-downward direction of the display panel <NUM>.

An extension sheet <NUM> may extend from the lower side of the display panel <NUM>. The extension sheet <NUM> may have a width corresponding to the length of the lower side of the display panel <NUM>, and may have a length sufficient to be wound around the panel roller <NUM>.

Referring to <FIG>, the lower end of the extension sheet <NUM> may be fixed to one side of the panel roller <NUM>. The upper end of the extension sheet <NUM> may be connected to the display panel <NUM>. As the panel roller <NUM> is rotated, the extension sheet <NUM> may be wound around the panel roller. For example, the number of revolutions that the extension sheet <NUM> is wound around the panel roller <NUM> may be one revolution or less.

As the extension sheet <NUM> is wound around the panel roller <NUM>, the display panel <NUM> and the module cover <NUM> may be wound around the panel roller <NUM>. When the extension sheet <NUM> is wound around the panel roller <NUM>, the module cover <NUM> may be wound earlier around the panel roller <NUM> than the display panel <NUM>, and then the display panel <NUM> and the module cover <NUM> may be wound around the panel roller <NUM> together. That is, the module cover <NUM> may cover a portion of the rear surface of the extension sheet <NUM> and the rear surface of the display panel <NUM>.

For example, the display panel <NUM> and the extension sheet <NUM> may be wound around the panel roller <NUM> by <NUM> to <NUM> revolutions. At this time, the display panel <NUM> may be wound around the panel roller <NUM> by about <NUM> revolutions.

Referring to <FIG>, as the display panel <NUM> and the module cover <NUM> are wound around the panel roller <NUM> by one revolution or more, the rear surface of the module cover <NUM> may overlap the front surface of the display panel <NUM>. At this time, as the display panel <NUM> and the module cover <NUM> are wound around the display panel <NUM> and the module cover <NUM> wound around the panel roller <NUM> by one revolution in an overlapping state, the display panel <NUM> starting to be wound by two revolutions may be bent or folded due to the thickness of the display panel <NUM> and/or the module cover <NUM>. In addition, vibration and noise may be generated as the panel roller <NUM> is rotated.

Referring to <FIG>, the module cover <NUM> is coupled to the rear surface of the display panel <NUM>. The S-PCB <NUM> may be located adjacent to the upper side of the display panel <NUM>. The S-PCB <NUM> may be electrically connected to the display panel <NUM> via a chip on film (COF) <NUM>. The FFC cable <NUM> extends from the S-PCB <NUM> toward the lower end of the display panel <NUM> through the module cover <NUM> so as to be electrically connected to the T-con board <NUM> (see <FIG>).

Shock-absorbing members 16A and 16B are disposed on the extension sheet <NUM>. The shock-absorbing members 16A and 16B may be referred to as gap fillers. The shock-absorbing members 16A and 16B may extend long in the leftward-rightward direction of the display panel <NUM>, and a plurality of shock-absorbing members 16A and 16B may be sequentially disposed in the upward-downward direction of the display panel <NUM>. For example, each of the shock-absorbing members 16A and 16B may be sponge or reinforced sponge. A first plurality of shock-absorbing members 16A may be disposed between the right side of the display panel <NUM> and the FFC cable <NUM>. In addition, a second plurality of shock-absorbing members 16B may be disposed between the left side of the display panel <NUM> and the FFC cable <NUM>.

For example, each of the shock-absorbing members 16A and 16B may be made of polyurethane, may have a length of <NUM>, a width of <NUM>, and a thickness of <NUM>. As another example, the number of shock-absorbing members 16A may be <NUM>, and the number of shock-absorbing members 16B may be <NUM>.

The extension sheet <NUM> may extend from the lower side of the display panel <NUM>. The extension sheet <NUM> may have a width corresponding to the length of the lower side of the display panel <NUM>, and may have a length sufficient to be wound around the panel roller <NUM>.

The shock-absorbing members 16A and 16B may be symmetrical with respect to the FFC cable <NUM> on the extension sheet <NUM>. The first plurality of shock-absorbing members 16A may be fixed to the extension sheet <NUM> at the right side of the display panel <NUM> with respect to the FFC cable <NUM>. The second plurality of shock-absorbing members 16B may be fixed to the extension sheet <NUM> at the left side of the display panel <NUM> with respect to the FFC cable <NUM>.

The shock-absorbing members 16A and 16B may not be distinguished in external appearance from the module cover <NUM>. The shock-absorbing members 16A and 16B may have the same shape as the module cover <NUM>, and may be made of a different material than the module cover <NUM>. For example, the module cover <NUM> may be made of aluminum or steel, and the shock-absorbing members 16A and 16B may be made of sponge. As the extension sheet <NUM> is wound around the panel roller <NUM>, the shock-absorbing members 16A and 16B may also be wound around the panel roller <NUM>. When the shock-absorbing members 16A and 16B are wound around the panel roller <NUM>, the distance between the shock-absorbing members may increase due to curvature of the panel roller <NUM>.

Referring to <FIG>, the module cover <NUM> may be fixed to the rear surface of the display panel <NUM> via an adhesive member <NUM>. The extension sheet <NUM> may extend from the lower side of the display panel <NUM>. The extension sheet <NUM> may be coupled or connected to the display panel <NUM> via an adhesive sheet <NUM>. The adhesive sheet <NUM> may be the same as the adhesive member <NUM>.

The shock-absorbing members 16A may be fixed to the adhesive sheet <NUM>, or may be fixed to the rear surface of the extension sheet <NUM>. For example, the shock-absorbing members 16A may located adjacent to the lower end of the module cover <NUM>, and may be sequentially disposed on the adhesive sheet <NUM> and the extension sheet <NUM> in the upward-downward direction of the display panel <NUM>. A first shock-absorbing member 16a may be fixed to the adhesive sheet <NUM> in the state of being adjacent to the lower end of the module cover <NUM>. A second shock-absorbing member 16b may be fixed to the adhesive sheet <NUM> in the state of neighboring the first shock-absorbing member 16a. A third shock-absorbing member 16c may be fixed to the adhesive sheet <NUM> in the state of neighboring the second shock-absorbing member 16b. A fourth shock-absorbing member 16d may be fixed to the adhesive sheet <NUM> and/or the extension sheet <NUM> in the state of neighboring the third shock-absorbing member 16c. At this time, the fourth shock-absorbing member 16d may have adhesive force.

A fifth shock-absorbing member 16e may be fixed to the extension sheet <NUM> in the state of neighboring the fourth shock-absorbing member 16d. A sixth shock-absorbing member 16f may be fixed to the extension sheet <NUM> in the state of neighboring the fifth shock-absorbing member 16e. A seventh shock-absorbing member <NUM> may be fixed to the extension sheet <NUM> in the state of neighboring the sixth shock-absorbing member 16f. At this time, the fifth shock-absorbing member 16e to an eighth shock-absorbing member <NUM> (see <FIG>) may have adhesive force.

The distance between the respective shock-absorbing members 16A may be substantially equal to or greater than the distance between the respective segments of the module cover <NUM>. The distance between the first shock-absorbing member 16a, the second shock-absorbing member 16b, the third shock-absorbing member 16c, and/or the fourth shock-absorbing member 16d may be greater than the distance between the respective segments of the module cover <NUM>. The distance between the fifth shock-absorbing member 16e, the sixth shock-absorbing member 16f, and/or the seventh shock-absorbing member <NUM> may be greater than the distance between the first shock-absorbing member 16a, the second shock-absorbing member 16b, the third shock-absorbing member 16c, and/or the fourth shock-absorbing member 16d. Consequently, it is possible to prevent bending that may be formed as the extension sheet <NUM> and the shock-absorbing members 16A are wound around the panel roller <NUM>.

Referring to <FIG>, the extension sheet <NUM> (see <FIG>) and the shock-absorbing members 16A are wound around the panel roller <NUM>, and then the display module <NUM> and the module cover <NUM> are wound around the panel roller <NUM>. As a result, the display module <NUM> and the module cover <NUM> overlap the extension sheet <NUM> and the shock-absorbing members 16A, whereby the shock-absorbing members 16A fixed to the extension sheet <NUM> may be compressed and thus form a gentle gradient.

Compression of the shock-absorbing members 16A may be performed with respect to the display panel <NUM> and the module cover <NUM> in the order of the eighth shock-absorbing member <NUM>, the seventh shock-absorbing member <NUM>, and the sixth shock-absorbing member 16f. At this time, the height of the compressed seventh shock-absorbing member <NUM> may be greater than the height of the compressed eighth shock-absorbing member <NUM>, and the height of the compressed sixth shock-absorbing member 16f may be greater than the height of the compressed seventh shock-absorbing member <NUM>. In addition, the height of the compressed fifth shock-absorbing member 16e may be greater than the height of the compressed sixth shock-absorbing member 16f, and the height of the compressed fourth shock-absorbing member 16d may be greater than the height of the compressed fifth shock-absorbing member 16e. The height of the first shock-absorbing member 16a may be substantially equal to the thickness of the module cover <NUM>.

Claim 1:
A display device (<NUM>) comprising:
a housing (<NUM>) providing an internal accommodation space;
a roller (<NUM>) installed in the housing (<NUM>);
a display panel (<NUM>) which is wound around or unwound from the roller (<NUM>);
a module cover (<NUM>) coupled to a rear of the display panel (<NUM>), the module cover (<NUM>) which is wound around or unwound from the roller (<NUM>) together with the display panel (<NUM>);
an extension sheet (<NUM>) extending from one lateral side of the display panel (<NUM>), the extension sheet (<NUM>) which is wound around the roller (<NUM>);
at least one shock-absorbing member (16A, 16B) located next to one lateral side of the module cover (<NUM>), the at least one shock-absorbing member (16A, 16B) fixed to a rear surface of the extension sheet (<NUM>); and
a cable (<NUM>) located at a rear of the extension sheet (<NUM>),
characterized in that the at least one shock-absorbing member (16A, 16B) comprises:
a first plurality of shock-absorbing members (16A) fixed to the extension sheet (<NUM>); and
a second plurality of shock-absorbing members (16B) fixed to the extension sheet (<NUM>) and opposite to the first plurality of shock-absorbing members (16A) with respect to the cable (<NUM>).