KR20080100590A - Display apparatus - Google Patents

Abstract

A display device is provided to have a step unit for setting rotation limitation of a rotation shaft, thereby preventing excessive rotation. A display apparatus(1) comprises a display module(10), a rotation body(20), a rotation shaft(301) and a supporting unit(30). The rotation body is fixed to the display module. The rotation shaft includes a step unit. The rotation body is connected with the step unit. The step unit sets rotation limitation of the rotation body. The supporting unit is extended in a direction crossing the rotation shaft to support the display module.

Description

Display apparatus

1 is a perspective view of a display device according to the present invention;

2 is an exploded perspective view of a display device according to the present invention;

Figure 3 is a rear perspective view of the holder constituting the rotating body according to the present invention.

Figure 4 is a perspective view of the support according to the present invention.

5 is an exploded perspective view showing the holder, the cover is coupled to the support unit according to the present invention.

6 is an operational state diagram showing a state in which the display device according to the invention rotates forward.

7 is an operating state diagram showing a state in which the display device according to the invention rotates to the rear.

<Explanation of symbols for the main parts of the drawings>

1: display device 10: display module

20: rotating body 21: holder

23: cover 30: support

301: rotating shaft 35: friction member

40: base

The present invention relates to a display device, and more particularly, to a display device that includes a hinge for rotatably supporting the display device, the rotation limit of which is set, and which smoothly operates when a user stands.

The stand is a structure used to mount the display device on a predetermined horizontal surface. Such a stand is generally composed of a support coupled to the back of the display device and a base connected to the bottom of the support to support the support and be placed on the bottom.

At this time, the support portion coupled to the rear surface of the video display device is generally configured to rotate the video display device back and forth for the convenience of the user.

In this way, in order to rotate the video display device back and forth, the stand is provided with a support on the upper side of the support, and is configured to couple the video display device to one side of the support.

In this case, the conventional support part has a problem that the coupling is loosened as the stand operation of the user is repeatedly coupled by the rotation shaft formed separately, and there is a problem in that the hinge is shaken or worn due to the gap between the rotation shaft and the support part. there was.

The present invention has been proposed to solve the above problems, a stepped portion for setting the rotational limit of the rotating body is formed, the rotating shaft for rotating the display device to provide a display device that is in close contact with the friction member For the purpose of

In addition, an object of the present invention is to provide a display device having a good oil resistance and heat resistance through a friction member of NBR (nitrile butadiene rubber) material between the rotating body and the rotating shaft.

In order to solve the above problems, the display device according to the present invention is

According to an aspect of the present invention, there is provided a display apparatus including: a display module; a rotating body fixed to the display module; and a rotating shaft having a stepped portion coupled to the rotating body and setting a rotational limit of the rotating body; And a support part extending in a direction crossing the rotating shaft to support the display module.

In addition, the display device according to the present invention includes: a display module; and a rotating body fixed to a rear surface of the display module; and a rotating shaft which is rotatably coupled to the front and rear direction and has different curvatures of the front part and the rear part; And a support part integrally formed with the pivot shaft and extending vertically with respect to the bottom surface, wherein the front curvature of the pivot shaft is smaller than the rear curvature.

In addition, the display device according to the present invention includes a display module; and a holder fixed to a rear surface of the display module; and a cover coupled to the holder; and a support portion rotatably coupled to the display module; It is formed in the cross direction, the holder is in close contact with the front surface, the rotating shaft is in close contact with the cover; The rotating shaft has a cross-sectional shape of a portion in which the holder is in close contact with the cover It is characterized by another.

At this time, the rotating body or the support is preferably molded in plastic.

Those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments falling within the scope of the same spirit by adding, changing, deleting, and adding components. However, this will also be included within the scope of the present invention.

A display device according to the present invention will be described with reference to the drawings.

1 is a perspective view of a display device in which the idea of the present invention is disclosed.

Referring to FIG. 1, the display device 1 includes a display module 10 that implements an image, a rotating body 20 fixed to a rear surface of the display module 10, and a hinge combination with the rotating body 20. The support 30 and the base 40 is coupled to the lower end of the support 30 is mounted on the installation surface.

In detail, one side of the pivot 20 is fixed to the lower side of the rear surface of the image display module 10. The display module 10 includes a display panel for outputting an image and a cover covering the display panel.

The pivot 20 consists of a pair of corresponding members, the pair of corresponding members comprising a holder 21 (see FIG. 2) and a cover 23 (see FIG. 2). The holder is fixed to the back of the display device, the cover is coupled to the holder 21 to enable the entire rotation of the stand.

The upper side of the support 30 is hinged to the pivot 20, the lower side is fixed to the base 40.

The base 40 has a predetermined area and is connected to the lower end of the support part 30 to support the display module 10.

Hereinafter, the structure and function of the display device according to the present invention will be described in more detail with reference to the accompanying drawings.

2 is an exploded perspective view of a display device in which the idea of the present invention is disclosed.

Referring to FIG. 2, the display device 1 includes, as described above, a display module 10 for implementing an image, a rotating body 20 fixed to a rear surface of the display module 10, and the rotating body. A support portion 30 hinged to 20 and a base 40 coupled to the lower end of the support portion 30 and seated on an installation surface are included. The pivot 20 includes a holder 21 fixed to the rear surface of the display module 10 and a cover 23 coupled to the rear side of the holder 21.

The display module 10 includes a display panel (not shown) for outputting an image and a cover (not shown) covering the display panel.

First, a rear fixing part 101 for coupling the pivoting body 20 is formed on the rear surface of the display module 10. In addition, the rear fixing part 101 is provided with a plurality of fastening holes 102 into which the fastening member is inserted. In detail, the fastening hole 102 is formed in a back cover (not shown) covering the rear of the display panel (not shown).

The rear fixing part 101 may be formed by recessing or protruding a portion of the rear surface of the display module 10. Hereinafter, the former case will be described as an example.

Meanwhile, through holes 214 (see FIG. 3) for fastening members are formed at each corner of the holder 21. By the above configuration, the fastening member penetrates through the fastening hole 102 and the through hole 214 (see FIG. 3) in order and is inserted into the cover.

A rotating shaft 301 (see FIG. 4) which is hinged to the pivot 20 is formed above the support 30. The pivot shaft 301 (see FIG. 4) is formed in a direction penetrating the inside of the support part 30 and is integrally formed with the support part 30. Here, the structure of the pivot shaft 301 (see Fig. 4) is not limited to the embodiment shown, it will be understood that it may be formed as a separate member and coupled to the support 30.

In detail, when the pivot shaft 301 (refer to FIG. 4) is integrally formed with the support part 30 by injection molding, a fastening member is not required, thereby reducing manufacturing cost and providing simple assembly. In addition, there is an advantage in that the friction sound caused by unnecessary swing between the hinge and the pivot shaft and the wear phenomenon due to friction are removed in the process of rotating the display module 10.

The upper end of the support 30 is coupled to the pivot 20 and the lower end of the support 30 is coupled to the upper surface of the base 40.

On the other hand, the cover 23 is in close contact with the rotation shaft of the support portion 30 rotatably. In addition, the front surface of the cover 23 is fastened to the holder 21.

A coupling structure of the holder 21, the support part 30, and the cover 23 will be described in more detail below with reference to the accompanying drawings.

The base 40 is coupled by the support 30 and the fastening member 41.

In detail, the fastening hole is formed at the lower end of the base 40 and the support part 30, and both members are coupled by allowing the fastening member 41 such as a screw to pass through the fastening hole.

Hereinafter, the operation of the display device having the above configuration will be described in brief.

First, the user rotates the display module 10 in the front-rear direction to adjust the front-rear angle of the display module 10. Then, the rotating body 20 fixed to the rear surface of the display module 10 is rotated about the upper end of the support portion 30 as an axis. At this time, the rotating body 20 is rotated in close contact with the outer peripheral surface of the rotating shaft 301 (see FIG. 4). And, by the shape of the rotating shaft it is possible to rotate only within a certain angle range, the content thereof will be described later.

3 is a rear perspective view of a holder constituting a rotating body in which the idea of the present invention is disclosed, and FIG. 4 is a perspective view of a support part in which the idea of the present invention is disclosed.

First, referring to FIG. 3, a recess 211 for mounting the pivot shaft 301 (see FIG. 4) is formed on a rear surface of the holder 21. In addition, a hinge fastening part 213 is formed at the center of the holder 21 to insert an upper end of the support part 30.

In detail, the hinge fastening part 213 has a shape recessed to a predetermined depth upward from the lower end of the holder 21. The lower end of the holder 21 is opened by the hinge fastening part 213, so that the holder is rotated even when the display module 10 is rotated while the upper end of the support part 30 is fitted to the holder 21. 21 will not interfere with the support 30.

In addition, a through hole 214 through which the fastening member penetrates is formed at a corner of the holder 21.

Meanwhile, the fastening member penetrating the back cover of the display module 10 is fitted into the through hole 214 of the holder 21. The end of the fastening member passing through the through hole 214 is inserted into the cover 23 (see FIG. 2). By the structure as described above, since the fastening member for coupling the holder 21 and the cover 23 (see FIG. 2) is not exposed to the outside, the appearance of the display device is smoothly formed.

The depression 211 is formed in an arc shape having a predetermined curvature. This is for the holder 21 to rotate smoothly with respect to the outer circumferential surface of the rotation shaft. An inclined surface 212 is formed on at least one portion of the upper and lower ends of the recess 211. The inclined surface is formed by chamfering, thereby increasing the area of contact with the friction member. Therefore, there is an effect that the force applied to the friction member is dispersed. As a result, even if the rotation operation of the display module 10 is repeated several times by the inclined surface 212, the friction member is not easily worn.

The depression 211 is coupled to the pivot shaft 301 (see FIG. 4) of the support 30. The rotating shaft is a member that becomes an axis by rotating the display module 10 itself. Therefore, the depression 211 is formed in a shape in which a portion of the circle is cut. Meanwhile, the inclined surface 212 is formed at a portion of the holder 21 connected to the recess 211.

In detail, the inclined surface 212 is formed to correspond to the stepped portion 302 (see FIG. 4) formed at a portion of the pivot shaft 301 at a portion where the recessed portion is connected to the rear surface of the holder.

The hinge fastening part 213 is a part to which the rotation guide 306 (see FIG. 4) is coupled to when the support part is engaged. The hinge fastening portion 213 should be formed to a degree larger than the size of the longitudinal direction of the rotation guide of the support for smooth rotation.

Referring to FIG. 4, the hinge part includes a pivot shaft, an upper end of the hinge part including the pivot shaft, and a lower end of the hinge part supporting the hinge part.

The pivot shaft 301 is formed in a shape projecting to the left and right of the support portion 30 in the drawing, the front portion of the protruding portion is in close contact with the depression 211.

The cross-sectional shape of the pivot shaft 301 is an arc-shaped front face portion 301a that is in close contact with the recessed portion 211 of the holder 21 and curved at a predetermined curvature, and an opposite surface of the front face portion 301a. It is formed in a circular arc-shaped rear portion 301b which is formed in the curvature with a relatively larger curvature than the front portion (301a). In addition, since the rear part 301b is coupled to the cover, the rear part 301b is formed in a part of a circular shape having a different size, and a part where the front part 301a and the rear part 301b are connected has a stepped part due to a difference in curvature. In addition, the stepped portion is caught by the inclined surface 212 of the holder is limited the maximum rotation angle of the display.

In the embodiment of the present invention, in the difference in the diameter of the rotating shaft 301, the curvature of the front portion 301a is formed to be small, but it is necessary to form a stepped portion to perform a stopper function on the rotating shaft 301 itself The front portion of the pivot shaft 301 may have a greater curvature than the rear portion. In this case, of course, a design change needs to be made so that any part of the cover is caught in the stepped portion.

In more detail, in the present embodiment, the rotating shaft has been shown to be integrally formed with the supporting part, but the rotating shaft 301 may be formed as a separate member to be fastened to the supporting part 30.

On the other hand, the step portion 302 is formed in a shape inclined at a predetermined angle. This is to correspond to the inclined surface 212 formed on the rotating body 20, to increase the durability by preventing the fatigue of the member generated by contacting the inclined surface 212 and the stepped portion 302 is not concentrated will be. In addition, the stepped portion 302 is formed to prevent the friction member 35 from turning on the outer circumferential surface of the rotation shaft 301 together with the holder 21 during the rotation process of the display device 1. It also works.

A support rib 310 is formed to connect the outer circumferential surface of the pivot shaft 301 and the inner circumferential surface of the pivot guide 306 so that the pivot shaft 301 is spaced apart from the pivot guide 306 by a predetermined interval. Make sure it's fixed. In other words, the pivot shaft 301 is fixed in a shape penetrating the inner space of the guide by the support rib 310. In addition, since the pivot shaft 301 is fixed to the inside of the guide by the plurality of support ribs 310, the support part 30 becomes light, and the manufacturing cost of the support part 30 is reduced. In addition, the support rib 310 functions so that the shape of the pivot shaft 301 is not deformed or destroyed by the rotational force received by the rotation of the display module 10. That is, the support rib 310 has the effect of strengthening the bearing force of the pivot shaft 301.

The support ribs 310 may be formed in various shapes and various numbers as necessary, such as the magnitude of the force acting on the rotating body.

The rotation guide 306 is located at the upper end of the support 30 and integrally formed on a part of the rotation shaft 301. The rotation guide 306 is coupled to the hinge fastening portion 213 of the holder 21 serves to guide the rotation of the display module 10. The rotation guide 306 is formed in a shape extending in the axial direction of the rotation shaft 301, which minimizes the shaking caused by the rotation.

On the other hand, the friction member 35 is made of a closed band-shaped flexible member is fitted to the outer peripheral surface of the rotating shaft 301. Here, when the friction member is made of an elastic band shape, the friction member is in close contact with the outer circumferential surface of the rotation shaft 301.

In detail, the assembler extends the inner diameter of the friction member 35 to increase, and then fits the outer circumferential surface of the rotation shaft 301 so that the friction member 35 is in close contact with the outer circumferential surface of the rotation shaft 301 by elastic restoring force. . In this embodiment, one friction member 35 is formed to be coupled to both ends of the rotation shaft 301, respectively.

In more detail, the friction member tightly coupled to both ends of the pivot shaft 301 may include the holder 21 and the cover 23 when the support part 30 is engaged with the pivot body 20. In contact with the depressions 211 and 231, respectively. When the support part 30 and the pivoting body 20 are coupled to each other, and the display module 10 rotates, between the recesses 211 and 231 of the cover and the friction member 35, the holder 21 and the cover 21 are rotated. Friction occurs. The display module is not rotated by its own weight in a state in which the display module is inclined at a predetermined angle due to the friction force.

Since the friction member 35 is interposed on the other side, the gap between the members does not occur when the rotating body 20 and the rotating shaft 301 are coupled to each other.

In detail, since the friction member 35 is intervened so that the clearance between parts does not occur, the display module 10 may be smoothly rotated without swinging.

In more detail, in order to form no gap between the members, as shown in FIG. 5, the display module 10, the holder 21, the support part 30, and the cover 23 are fastening members. To be strongly clamped. And, by adjusting the fastening degree of the fastening member, there is an effect that can support the rotation of the display module 10 of various loads.

The friction member 35 is made of a rubber material having heat resistance and oil resistance.

In detail, the friction member 35 may be made of a heat resistant material in order to prevent the frictional heat generated by the rotation of the display module 10 and the expansion of the volume due to the thermal deformation caused by the frictional heat. In order to smoothly rotate the display module 10, lubricant is applied to the surface of the friction member 35. In order to prevent the friction member 35 from being corroded by the lubricating oil, the friction member is preferably made of an oil resistant material.

In order to satisfy the above requirements, the friction member 35 may be NBR (nitrile butadiene rubber). NBR material is a synthetic rubber made by the polymerization of acrylonitrile and butadiene, and is mainly used for industrial products requiring oil resistance because of its strong oil resistance and abrasion resistance. Therefore, when the friction member 35 is formed by using the NBR material, thermal deformation generated by the rotation of the display module 10 is minimized, and corrosion by lubrication is minimized.

On the other hand, the rotating locking jaw 305 is formed below the rotating shaft 301.

In detail, the rotation locking step 305 is formed on one surface of the support part 305, a part is formed horizontally, and the remaining part is formed to be inclined downward by a predetermined angle.

In more detail, the inclined portion 212 is in contact with the stepped portion 302 to limit the rotation, and at the same time the rotating body 21 is in contact with the rotation locking jaw 305 so that the rotation can be limited, An inclined angle of the pivoting jaw is formed. Therefore, when the pivoting body 20 is rotated in a state coupled to the support part 30 and contacts the pivoting jaw 305, the pivoting body 20 may no longer rotate. That is, the rotation locking jaw 305 performs a stopper function for setting the rotational limit of the rotating body. Therefore, the pivoting jaw 305 not only performs the same function as the stepped portion formed on the pivot shaft, but also performs a function of distributing the load concentrated only on the stepped portion 302.

5 is an exploded perspective view illustrating a holder and a cover coupled to a support unit according to the present invention.

Referring to FIG. 5, the rotating body 20 including the holder 21 and the cover 23 is coupled to an upper side of the support part 30.

In detail, in the coupling between the rotating body 20 and the support part 30, the recess 211 formed in the holder 21 is in close contact with the front part 301a of the rotating shaft 301. In addition, the rotation guide 306 of the support part 30 is inserted into the hinge fastening part 213 of the holder 21. In addition, the depression 231 formed in the cover 23 is in close contact with the rear portion 301b of the rotation shaft.

In more detail, the depression 231 formed in the cover 23 is formed to be the same as the curvature of the rear surface portion 301b of the pivot shaft 301. Meanwhile, in the fastening method, as described above, the fastening member penetrates the fastening hole 102 formed in the rotating body coupling part 101 of the display module 10, and the fastening hole formed in the holder 21 ( 214). In addition, the fastening member penetrating the fastening hole 214 is inserted into the fastening member receiver 233 formed in the cover 23. A thread is formed on the inner circumferential surface of the receiving port 233 so that a fastening member such as a screw can be firmly fastened.

6 is an operational state diagram showing a state in which the display device according to the present invention rotates forward.

Referring to FIG. 6, when the display module 10 is tilted forward, the recess 211 of the holder 21 rotates along the front portion 301A of the pivot shaft. Although not shown, the recess 231 of the cover 23 rotates along the rear portion 301b of the pivot shaft 301 in this rotation process. In addition, the display module 10 is maintained in a fixed state without being moved by gravity in a state in which the display module 10 is tilted at a predetermined angle by the friction member 35 surrounded by the outer circumferential surface of the front part 301a.

In addition, the display module 10 is rotatable until the inclined portion formed at the lower end of the inclined portion 212 formed in the holder 21 contacts the stepped portion 302 formed at the lower end of the pivot shaft 301. do. That is, the maximum forward rotation angle of the display module 10 is determined by the inclined portion formed below the holder 21 and the stepped portion 302 formed on the lower end of the pivot shaft 301.

7 is an operating state diagram illustrating a state in which the display device according to the present invention rotates backward.

Referring to FIG. 7, when the display module 10 rotates backward, the recessed portion 211 of the holder 21 rotates along the front portion 301a of the rotation shaft 301 as in FIG. 6. Then, the inclined portion 212 formed at the upper end of the holder 21 is rotatable until it comes in contact with the stepped portion 302 formed at the upper end of the rotation shaft 301.

In more detail, the recessed portion 231 formed in the cover 23 has a cylindrical shape so as to correspond to the pivot shaft 301. The recessed portion 231 may be integrally molded in the cover 23, but in this embodiment, the support rib is formed to have a rib. The support ribs are effective to reduce the weight of the member, but have an effect of increasing durability such that the recess 231 is not deformed in the coupling of the pivot shaft and the cover 23.

Meanwhile, in the fastening method, as described above, the fastening member penetrates the fastening hole 102 formed in the rotating body coupling part 101 of the display module 10, and the fastening hole formed in the holder 21 ( 214 penetrates and is fastened to a fastening member receiver 233 formed in the cover 23. The fastening member receiver 233 may have a spiral formed inside the receiver. In addition, such a fastening member generally uses a screw of a bolt structure, and may be formed in a structure in which an end of the fastening member is inserted into the fastening member receiving opening 233 and fastened by a spiral.

The fastening of the press-fit method has an advantage in that the fastening degree can be variously adjusted according to the fastening force of the fastening member. Therefore, the fastening force can be adjusted to various degrees according to the load of the display module 10.

6 is an operational state diagram showing a state in which the display device according to the present invention rotates forward.

Referring to FIG. 6, the holder is engaged with the pivot shaft of the support to operate the hinge.

The pivot shaft 301 is coupled to correspond to the depression 211 formed in the holder 21. Since the friction member 35 is fitted to both ends of the rotation shaft 301, the depressions are sequentially 211, the friction member 35, and the rotation shaft 301.

In detail, in the operation of the holder 21, when the display module 10 is tilted to face the bottom surface, one of the inclined portions 212 formed in the holder 21 is formed at the lower end of the rotation shaft 301. The stepped portion 302 formed at the bottom is in contact with the support.

7 is an operating state diagram illustrating a state in which the display device according to the present invention rotates backward.

Referring to FIG. 7, in the operation of the holder 21, when the display module 10 is kept tilted upward with respect to the user, the holder 21 is inclined upward by a predetermined angle. . In this case, the inclined portion 212 formed at the upper end of the holder 21 contacts and supports the stepped portion 302 formed at the upper end of the rotation shaft 301.

Those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments falling within the scope of the same spirit by adding, changing, deleting, and adding components. However, this will also be included within the scope of the present invention.

Since the display device having the above structure can be made of a small number of parts, the display device can be manufactured at low cost.

In addition, the display device is provided with a stepped portion for setting a rotational limit on the rotating shaft, there is an effect of preventing the rotating body from excessive rotation beyond the preferred range of rotation.

In addition, the display device is formed by setting the curvature of the front and rear parts of the rotating shaft differently to form a stepped portion, there is no need to combine the other members, the production cost is low, convenient when assembling the display device, the reliability of the work It is effective to increase.

In addition, the display device is formed by interposing a friction member on the rotating shaft, the friction member including the NBR material is excellent in heat resistance and oil resistance, and the holder and cover forming the rotating body is coupled to the support portion Since the friction member is interposed there is an effect that can be rotated smoothly without swinging when the display device is rotated.

Claims (18)

Display module; A rotating body fixed to the display module; A rotating shaft to which the rotating body is coupled and includes a stepped portion for setting a rotational limit of the rotating body; And a support part extending in a direction crossing the rotating shaft to support the display module. The method of claim 1, And the stepped portion is formed on an outer circumferential surface of the pivotal shaft or is formed as a separate member that can be coupled to the pivotal shaft. The method of claim 1, And the pivot shaft is formed to have a plurality of curvatures along its outer circumferential surface. The method of claim 3, wherein The outer circumferential surface of the pivot shaft is divided into a front surface formed of a first curvature and a rear surface formed of a second curvature, wherein the first curvature and the second curvature are the same or different from each other. The method of claim 1, The rotating body, the holder is formed with a recess for being in close contact with the front portion of the rotating shaft, And a cover having a recess formed in close contact with a rear portion of the pivotal shaft. The method of claim 1, And a friction member interposed between the rotating shaft and the rotating body. The method of claim 6, And the friction members are respectively provided at both ends of the pivot shaft. The method of claim 6, The friction member includes a nitrile butadiene rubber (NBR). Display module; A rotating body fixed to the rear surface of the display module; A rotatable shaft coupled to the rotatable body in a front-rear direction and having different curvatures of the front part and the rear part; And A support part integrally formed with the pivot shaft and extending perpendicular to the bottom surface, And a front curvature of the pivot shaft is smaller than a rear curvature. The method of claim 9, And a belt-shaped friction member wound around an outer circumferential surface of the pivot shaft. The method of claim 9, Rotating body guide which forms the support portion, and covers a portion of the rotating shaft, Both end portions of the pivot shaft protrude outward of the guide, respectively. The method of claim 9, The display device further comprises a friction member each surrounding the outer circumferential surface of the rotating shaft protruding to the outside of the guide. The method of claim 9 or 12, The friction member includes a nitrile butadiene rubber (NBR). Display module; A holder fixed to a rear surface of the display module; A cover coupled to the holder; A support unit to which the display module is rotatably coupled; It is formed in a direction crossing the longitudinal direction of the support portion, the holder is in close contact with the front, includes a rotating shaft in close contact with the cover, The rotating shaft is a display device, characterized in that the cross-sectional shape of the portion where the holder is in close contact with the cover is in close contact. The method of claim 14, And a friction member fitted to an outer circumferential surface of the pivot shaft, the friction member having a predetermined ductility. The method of claim 14, The friction member includes a nitrile butadiene rubber (NBR). The method of claim 14, Recesses in close contact with the pivot shaft are formed on the rear of the holder and the front of the cover, respectively. And a curvature of the depressions formed in the holder and the depressions formed in the cover are different from each other. The method of claim 14, And a stepped portion configured to set a rotation limit of the display module at a point where the front portion and the rear portion of the rotation shaft meet.

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