KR100833377B1 - Height adjustment device of video display device and video display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an image display device, and more particularly, to a height adjusting device for an image display device in which lifetime of a product is extended, durability is improved, and compatibility between devices is improved.

According to an aspect of the present invention, there is provided a height adjusting device for a video display device, including: a first vertical frame; A second vertical frame extending in the longitudinal direction of the first vertical frame, the second vertical frame being formed to be capable of being drawn in and drawn out from the first vertical frame; An elastic member interposed between the first vertical frame and the second vertical frame to provide a predetermined elastic force; And a friction member interposed between the first vertical frame and the second vertical frame to provide a frictional force to maintain the fixed position of the second vertical frame.

According to the present invention as proposed, the height adjustment device of the image display device can be used in common, thereby reducing the product development cost and simplifying the manufacturing process.

Image display device, height adjustment, coil spring

Description

[0001] The present invention relates to a height adjustment device for a video display device and a video display device,

1 is an exploded perspective view showing a height adjusting device of a conventional video display device.

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an image display apparatus,

3 is a schematic perspective view showing an image display device according to the present invention.

4 is a perspective view illustrating a height adjusting device of a video display device according to the present invention.

5 is an exploded perspective view illustrating a height adjusting device of a video display device according to the present invention.

6 is a cross-sectional view illustrating a state where the height adjusting device of the image display device according to the present invention is extended.

7 is a cross-sectional view illustrating a state in which an external force is applied to a height adjusting device of a video display device according to the present invention.

8 is a cross-sectional view illustrating a state in which a height adjusting device of a video display device according to the present invention is compressed.

Description of the Related Art

100: height adjustment device of a video display device 110: first vertical frame

120: second vertical frame 130: friction member

140: first horizontal frame 150: second horizontal frame

160: roller 170: hinge coupling part

180: base coupling portion 190: elastic member

200: wire 210: elastic force adjusting portion

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an image display device, and more particularly, to a height adjusting device for an image display device in which lifetime of a product is extended, durability is improved, and compatibility between devices is improved.

Generally, cathode ray tubes (CRTs) are mainly used for monitors such as televisions, metering devices, and information terminals. However, cathode ray tubes have become a big obstacle to downsizing, thinning, and lightening of electronic products due to their weight and volume.

In order to meet these demands, electronic products have been increasingly demanded for miniaturization, thinness, and light weight. In order to meet such demands, a flat panel type liquid crystal display device such as a liquid crystal display device, an EL (Electro-Luminescence) display device, a plasma display device Display devices have been developed and popularized at present.

FIG. 1 is an exploded perspective view showing a height adjusting device of a conventional video display device, and FIG. 2 is a schematic perspective view showing a state where a height adjusting device of a conventional video display device is extended to a certain height.

In general, a video display device includes a screen display unit for displaying a predetermined video signal on a screen, a pivot unit connected to a back surface of the screen display unit and capable of rotating the screen display unit forward, backward and leftward, A stand portion for vertically adjusting the height of the screen display portion, and a base portion for supporting the lower end portion of the stand portion.

1 and 2, the stand 1 includes a slider column 2 for fixing a lower portion of a pivot portion and a base column 3 for guiding the slider column 2 in a housed state, The base column 3 has a structure in which a plate spring 4 having a predetermined elastic force is provided on the inner side of the base column 3 so as to be in contact with the lower end of the slider column 2, . The leaf spring is screwed to the inside of the base column 3 through an auxiliary plate 5 of a predetermined size.

Accordingly, when the screen display portion of the image display device is lifted upward or downward, the load of the screen display portion comes into contact with the lower end of the slider column 2, When the height of the image display device, that is, the screen display portion, is once set by being supported by the elastic force, the screen display portion does not cause a phenomenon that the image display portion jumps upward or falls down from the height set by the user.

On the other hand, on the outer side of the base column 3, there is provided a locking part 6 for preventing the slider column 2 from unintentionally moving upwardly and downwardly when handling or transporting a video display device, Two plastic covers 21 and 22 are attached to the outer periphery of the base 2 to prevent noise from being generated due to mutual friction when the slider column slides up and down in the base column 3.

On the other hand, an upper stopper (7) protruding through the rear side plastic cover (22) is provided at a lower outer side of the slider column (2) so as to set a maximum height of the screen display part, The upper stopper 7 of the main body 2 is lifted together with the screen display portion and is caught by the lower edge of the lock portion 6 on the base column 3 side and this point becomes the maximum height of the image display device.

In addition, two lower stoppers 8 are provided on the inner lower portion of the base column 3 so as to set the minimum height of the screen display portion. As a result, the lower end portion of the slider column 2 is moved downward Is caught by the lower stopper (8) of the base column (3), which is the minimum height of the image display device.

On the other hand, two plastic covers 31 and 32 are attached to the outside of the base column 3. One of the two plastic covers is provided with a cable protection cover 33 so that the signal cable for the video display device is not exposed to the outside Is inserted.

However, the height adjusting device of the conventional image display device has the following problems.

As described above, since the image display device is becoming smaller, thinner, and lighter, the height adjusting device of the image display device is also downsized and thinned. Therefore, the thickness of the leaf spring used in the height adjusting device of the conventional image display device is thin Loses. However, since the above-described leaf spring has a limit in its durability, it is difficult to satisfy the durability (for example, up to 2,000 reciprocations or more) required basically in the height adjusting apparatus as the thickness of the leaf spring is thinner .

Secondly, since the plate spring is not easy to satisfy the durability required basically in the height adjusting device, the plate spring of different size is required according to the size and the weight of the display part. Therefore, There is a problem in that the parts can not be shared.

Third, since the height adjustment device is not used in common, the height adjustment device must be newly manufactured for each new product development. Therefore, the cost and time for designing and testing each additional model change are required.

Fourth, in the case of the above-mentioned plate spring, a sudden drop of the elastic force may occur due to accumulation of fatigue during a long time of leaving, thus increasing the failure rate of the product and increasing the maintenance / repair cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a height adjusting device for an image display device having improved durability and prolonged life span of a product by using coil springs.

Further, by using a coil spring which is superior in durability compared to a conventional leaf spring, a height adjusting device irrespective of the size and weight of the display portion can be realized, and a height adjusting device for a video display device that can be used in various models is provided .

Another object of the present invention is to provide a height adjusting device for an image display device applicable to various models by providing an elasticity adjusting member for adjusting an elastic force of a coil spring.

It is another object of the present invention to provide a height adjusting device for a video display device, which does not require designing and testing for a separate height adjusting device every time a product is developed through the above-described common use, .

Another object of the present invention is to provide a height adjusting device for a video display device which is excellent in mechanical properties and reduces manufacturing cost by using a friction member such as POM.

According to an aspect of the present invention, there is provided a height adjusting apparatus for a video display device, including: a first vertical frame extending in a vertical direction; A second vertical frame extending in the longitudinal direction of the first vertical frame, the second vertical frame being formed to be capable of being drawn in and drawn out from the first vertical frame; An elastic member interposed between the first vertical frame and the second vertical frame to provide an elastic force in a direction in which the second vertical frame is elongated and contracted when the second vertical frame is drawn into the first vertical frame; And a friction member interposed between the first vertical frame and the second vertical frame to provide a frictional force to maintain the fixed position of the second vertical frame.

According to another aspect of the present invention, there is provided a height adjusting device for a video display device, comprising: a first vertical frame extending in a vertical direction and having a depression at one side; A second vertical frame formed with depressions on a side portion corresponding to the depression of the first vertical frame and drawn in and drawn out from the first vertical frame; A friction member inserted between the depressions of the first vertical frame and the second vertical frame; A coil spring for providing a predetermined elastic force to the first vertical frame and the second vertical frame; A first horizontal frame fixedly coupled to the first vertical frame in a direction substantially perpendicular to the first vertical frame; A second horizontal frame fixedly coupled to the second vertical frame in a direction substantially perpendicular to the second vertical frame and moved up and down together with the second vertical frame; A roller coupled to the first horizontal frame to change the direction of the elastic force provided by the coil spring; And a first wire coupled to the coil spring and the second horizontal frame to transmit an elastic force provided by the coil spring to the second horizontal frame.

According to another aspect of the present invention, there is provided an image display apparatus including: a display unit displaying a predetermined image signal; A height adjusting device coupled to a back surface of the display unit and including an elastic member and a friction member so that the display unit is moved up and down by the interaction of the elastic member and the friction member and the display unit is kept stationary; An elastic force adjusting unit for adjusting an elastic force of the elastic member; And a base portion for supporting the display portion coupled to the height adjusting device and the height adjusting device.

According to the present invention as proposed, the height adjustment device of the image display device can be used in common, thereby reducing the product development cost and simplifying the manufacturing process.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated that this is also included in the scope of the present invention.

3 is a schematic perspective view showing an image display device according to the present invention.

3, the video display device according to the present invention includes a display unit 300 for displaying a predetermined video signal on a screen, and a display unit 300 connected to a back surface of the display unit 300, And a display unit 300 connected to a lower end of the height adjusting apparatus 100 and coupled to the height adjusting apparatus 100 and the height adjusting apparatus 100. The height adjusting apparatus 100 includes: (400).

In detail, the display unit 300 displays a predetermined video signal. It should be understood that the height adjusting device of the present invention is applicable to various flat panel display devices such as a plasma display panel (PDP), a liquid crystal display (LCD), and an organic light emitting diode (OLED) something to do.

In detail, the height adjusting device 100 is coupled to the back surface of the display unit 300 to support the display unit 300 and guide the up and down movement of the display unit 300. The video display device often needs to be adjusted in height according to the use position, the user's characteristics, the use environment, and the like. Therefore, the height adjusting device 100 can be extended in length, and the height of the display unit 300 coupled to one side of the height adjusting device 100 can be adjusted .

FIG. 4 is an assembled perspective view illustrating a height adjusting apparatus for an image display apparatus according to the present invention, and FIG. 5 is an exploded perspective view illustrating a height adjusting apparatus for an image display apparatus according to the present invention.

4 and 5, the height adjusting device 100 of the image display device according to the present invention is a skeleton of the height adjusting device 100 to support the height of the height adjusting device 100 as a whole, A second vertical frame 120 formed in the longitudinal direction of the first vertical frame 110 and configured to be drawn in and out of the first vertical frame 110, An elastic member 190 interposed between the first vertical frame 110 and the second vertical frame 120 to provide a predetermined elastic force to the first vertical frame 110 and the second vertical frame 120, And a frictional member 130 for providing a predetermined frictional force in a direction for canceling the elastic force provided by the elastic member 190. [

A first horizontal frame 140 is fixed to the outside of the first vertical frame 110 in a direction substantially perpendicular to the first vertical frame 110, A second horizontal frame 150 fixedly coupled to the second vertical frame 120 in a direction substantially perpendicular to the second vertical frame 120 and moving up and down together with the second vertical frame 120, A roller 160 coupled to the elastic member 190 to switch the direction of the elastic force provided by the elastic member 190 and an elastic member 190 coupled to the elastic member 190 and the second horizontal frame 150, The first wire 200 may further include a first wire 200 for transmitting an elastic force to the second horizontal frame 150.

The hinge unit 170 is coupled to an upper portion of the second vertical frame 120 to allow the display unit 300 to be coupled to the hinge unit 170. The hinge unit 170 is coupled to a lower portion of the first vertical frame 110, And a base coupling unit 180 to allow the base station 400 to be coupled.

An elastic force adjusting unit 210 coupled to one side of the base coupling unit 180 to adjust the strength of the elastic force provided by the elastic member 190 and the elastic force adjusting unit 210 And a second wire 205 coupled to the elastic force adjusting unit 210 to transmit the elastic force provided by the elastic member 190 to the elastic force adjusting unit 210.

In detail, the first vertical frame 110 forms a central axis of the height adjustment of the height adjusting device 100 according to the present invention. That is, the first vertical frame 110 is protruded from the base unit 400 supporting the image display device by a predetermined height in the vertical direction, and guides the vertical movement of the second vertical frame 120.

Meanwhile, the second vertical frame 120 is formed in a longitudinal direction of the first vertical frame 110, and is formed to be capable of being drawn in and drawn out from the first vertical frame 110. In other words, the second vertical frame 120 is coupled to the inside of the first vertical frame 110 and is configured to slide relative to the first vertical frame 110.

Here, the first vertical frame 110 may be formed integrally with the first vertical frame 110, and the first vertical frame 110 may be integrally formed with the first and second vertical frames 110 and 120, respectively. In addition, the second vertical frame 120 may be integrally formed as a whole. Alternatively, the second vertical frame 120 may be formed separately from the left / right sides as shown in FIG. 4, so as to be coupled to the hinge coupling part 170.

The first vertical frame 110 and the second vertical frame 120 may be formed so that the central portion of the rod-shaped frame 110 and the second vertical frame 120 are recessed relative to the peripheral portion. That is, the first vertical frame 110 and the second vertical frame 120, which are in contact with each other, are recessed in the longitudinal center axis direction, and the first vertical frame 110 and the second vertical frame 120 When formed, are formed to have a circular or elliptical shape as a whole.

A friction member 130 may be inserted between the depressions of the vertical frames 110 and 120. In other words, the friction member 130 is inserted into the hollow formed by the depressions of the first vertical frame 110 and the second vertical frame 120, To provide a predetermined frictional force to the second vertical frame (120). Accordingly, the friction member 130 serves to support the stop position of the second vertical frame 120 in a fixed state.

Preferably, the friction member 130 may be formed of POM (Poly Oxy Methylene). POM is also called polyoxymethylene, polyacetal, and acetal resin, and belongs to engineering plastics with excellent characteristics that can not be found in other materials such as fatigue resistance, toughness and abrasion resistance. Therefore, it is widely used as a material for various plastic gears / bearings, fasteners, driving parts for electronic products, and buckles for bags because of its good mechanical properties and low cost. By virtue of the above-described structure, the shape of the parts is simplified, the manufacturing cost is reduced, and the advantages of excellent mechanical properties can be obtained.

Preferably, the friction member 130 is formed to be larger than a space formed between the first vertical frame 110 and the depressed portions of the second vertical frame 120, And the second vertical frame 120, as shown in FIG. By the above structure, the first vertical frame 110 and the second vertical frame 120 are provided with a frictional force equal to or greater than a certain level, so that the stop position of the second vertical frame 120 can be stably maintained have.

Meanwhile, the elastic member 190 intervenes between the first vertical frame 110 and the second vertical frame 120 to provide a predetermined elastic force. Conventionally, in the case of a height adjusting device of a video display device, a leaf spring is generally used as an elastic member. However, as the image display device becomes smaller and thinner, the thickness of the leaf spring used in the height adjusting device becomes thinner. Therefore, the elastic force that can be provided by the leaf spring is decreased and the strength or durability Of the total amount of the product.

Therefore, in the apparatus for controlling height of a video display device according to the present invention, a coil spring is used as the elastic member 190 to improve durability and operational reliability of the product.

Specifically, the coil spring is a spring formed by wrapping a thin bar material like a vine of a plant, and is a spring most commonly used as a suspension of a passenger car. The strength of the spring is mainly determined by the thickness. The thicker the coil, the harder it becomes, and the more coiled, the smoother the larger the diameter of the coil becomes. There is a type in which the strength of the spring varies according to the degree of impact of the load or the road surface by gradually changing the thickness of the spring or changing the diameter of the coil. This is called a nonlinear spring or a progressive spring. Types of the coil spring include a cone coil spring, a drum coil spring, and a barrel coil spring.

By using the coil spring, which is provided with a strong elastic force so that it can be applied to display products of various sizes collectively, it is possible to use the height adjusting device in common, thereby reducing effort and cost in product development There are advantages.

Meanwhile, the first horizontal frame 140 is fixedly coupled to the first vertical frame 110 in a direction substantially perpendicular to the first vertical frame 110. In detail, the first horizontal frame 140 is formed in a box shape having a generally hollow shape and opening up and down. The first horizontal frame 140 is coupled to the outside of the first vertical frame 110 to support the height adjusting device 100 so that the height adjusting device 100 is stably fixed.

A rotation shaft 165 is coupled to the first horizontal frame 140 in a direction substantially perpendicular to the first vertical frame 110. A roller 160 for switching the direction of the elastic force provided by the elastic member 190 is inserted through the rotation shaft 165.

As described above, the first horizontal frame 140 is fixedly coupled to the first vertical frame 110, and the rotary shaft 165 and the roller 160 are fixedly coupled to the first horizontal frame 140. Accordingly, the first horizontal frame 140, the rotary shaft 165, and the rollers 160 are fixed in position regardless of the vertical movement of the second vertical frame 120.

Meanwhile, the second horizontal frame 150 is fixedly coupled to the second vertical frame 120 in a direction substantially perpendicular to the second vertical frame 120. In detail, the second horizontal frame 150 is formed in a box shape having a generally hollow shape and opening up and down. The second horizontal frame 150 is coupled to the inside of the second vertical frame 120 to support the height adjusting device 100 in a stable manner. Since the second horizontal frame 150 is fixedly coupled to the second vertical frame 120, the second vertical frame 120 can be moved up and down together with the second vertical frame 120 as the second vertical frame 120 moves up and down. .

In the second horizontal frame 150, a groove 151 through which the rotation shaft 165 can pass is formed. That is, in order to prevent the vertical movement of the second horizontal frame 150 from being restricted by the rotary shaft 165 coupled to the first horizontal frame 140 when the second horizontal frame 150 moves up and down A groove 151 is formed in the second horizontal frame 150. Therefore, the vertical movement of the second horizontal frame 150 is not restricted by the rotation axis 165. [

Meanwhile, the second horizontal frame 150 and the elastic member 190 are connected to each other by the first wire 200. 4, the first wire 200 extending from the elastic member 190 rotates about the roller 160 and is coupled to one side of the second horizontal frame 150 . The direction of the elastic force provided by the elastic member 190 is switched by the first wire 200 and the roller 160.

For example, when the elastic member 190 always provides an elastic force in the compression direction (i.e., in the case of a compression spring), the first wire 200 on the side coupled to the elastic member 190 And receives a force in a direction of pulling downward. Therefore, the first wire 200 on the other side of the first wire 200, that is, on the side connected to the second horizontal frame 150, receives a force in a direction of pulling upward in the drawing.

On one side of the base coupling unit 180, an elastic force adjusting unit 210 for adjusting the elastic force of the elastic member 190 is formed. In detail, the bolts 211 are coupled from the lower side of the base coupling part 180 to the upper side. An elastic force adjusting plate 212 is coupled to the threads of the bolts 211. Both ends of the elasticity adjusting plate 212 are bent and a second wire 205 extending from the elastic member 190 is coupled to the bent portion.

The height of the elastic force adjusting plate 212 is adjusted by the rotation of the bolts 211 and the height of the elastic force adjusting plate 212 is adjusted so that the second wires 205 and the elastic members 190 are adjusted. Therefore, the strength of the elastic force provided by the elastic member 190 can be adjusted. With the above structure, the elastic force of the elastic member 190 can be adjusted only by a simple operation of the elastic force adjusting part 210, thereby making it possible to share the height adjusting device.

The operation and operation according to the present invention will be described in detail with reference to the above-described structure.

FIG. 6 is a sectional view showing a state where the height adjusting device of the image display device according to the present invention is maximally stretched, FIG. 7 is a sectional view showing a state where an external force is applied to the height adjusting device of the image display device according to the present invention, 8 is a cross-sectional view illustrating a state where the height adjusting device of the image display device according to the present invention is fully compressed.

Referring to FIG. 6, in a state in which the height adjusting device of the image display apparatus according to the present invention is fully extended, the second vertical frame 120 and the second horizontal frame 150 coupled thereto are separated from the first vertical frame 110, As shown in FIG.

In a state where the height adjusting device of the image display device is maximally stretched, the distribution of the force acting on the second vertical frame is as follows. First, gravity W due to the weight of the display unit 300 acts in the direction of the ground. A frictional force P1 acts between the second vertical frame 120 and the friction member 130. The frictional force P1 acting on the second vertical frame 120 acts in the opposite direction of the same magnitude as the gravitational force W because the frictional force P1 acts in the opposite direction, do. That is, since the gravity W and the friction force P1 are in equilibrium, the height adjusting device 100 can maintain its fixed position.

Referring to FIG. 7, when an external force F equal to or greater than a certain level is given, the height adjusting device 100 moves in a direction in which the external force F is given.

In detail, gravity W due to the weight of the display unit 300 acts in the direction of the ground. Then, the external force F applied by the user also acts in the direction of the ground. The elastic member 190 provides the elastic force P2 in a direction in which the elastic member 190 is compressed and the elastic force P2 provided by the elastic member 190 is the elastic force 1 wire 200 to a second horizontal frame 150 and a second vertical frame 120 coupled thereto. Here, since the elastic force P2 provided by the elastic member 190 is changed by the roller 160, the force P2 acting on the second vertical frame 120 acts in the direction opposite to the ground. A frictional force P3 acts between the second vertical frame 120 and the friction member 130. Here, since the frictional force P3 acts in a direction opposite to the direction of motion, the frictional force P3 acting on the second vertical frame 120 acts in a direction opposite to the external force F. [

In other words, the force acting in the direction of the paper surface is the sum of the weight W of the display unit and the external force F applied by the user, and the force acting in the opposite direction of the paper surface is the elastic force P2 provided by the elastic member 190, 2 is the sum of the friction force P3 acting between the vertical frame 120 and the friction member 130. [ Therefore, when the external force F applied by the user is larger than (elastic force P2 + friction force P3 - self weight W), the height adjusting device moves in the direction of the ground.

Referring to FIG. 8, in the state where the height adjusting device of the image display device according to the present invention is fully compressed, the second vertical frame 120 and the second horizontal frame 150 coupled to the second vertical frame 120, As shown in FIG.

The distribution of the force acting on the second vertical frame in the state where the height adjusting device of the image display device is compressed as much as possible is as follows. First, gravity W due to the weight of the display unit 300 acts in the direction of the ground.

The elastic member 190 provides the elastic force P4 in a direction in which the elastic member 190 is compressed and the elastic force P4 provided by the elastic member 190 is the elastic force 1 wire 200 to a second horizontal frame 150 and a second vertical frame 120 coupled thereto. Here, since the elastic force P4 provided by the elastic member 190 is changed by the roller 160, the force P4 acting on the second vertical frame 120 acts in the direction opposite to the ground.

A frictional force P5 acts between the second vertical frame 120 and the friction member 130. Here, since the frictional force P5 acts in a direction opposite to the direction of motion, a force having a small magnitude of the gravitational force W and the elastic force P4 acts in a direction in which the force acts. In other words, when the magnitude of the gravity W is larger than the direction of the elastic force P4, the frictional force P5 acts in the direction opposite to the ground to prevent the second vertical frame 120 from descending. Conversely, when the magnitude of the gravity W is smaller than the direction of the elastic force P4, the frictional force P5 acts in the direction of the ground to prevent the second vertical frame 120 from rising. That is, since the gravity W, the elastic force P4, and the friction force P5 are balanced, the height adjusting apparatus 100 can maintain its fixed position.

With the above-described structure, by using a coil spring which is superior in elasticity and durability compared with the conventional leaf spring, there is an advantage that a height adjusting device independent of the size and weight of the display portion can be realized.

The height adjustment device of the image display device according to the present invention improves the durability of the image display device and extends the service life.

Further, by using a coil spring which is superior in durability compared to a conventional leaf spring, it is possible to implement a height adjusting device irrespective of the size and weight of the display portion, and thus it is possible to use the same in various models.

Further, since the elastic force adjusting member for adjusting the elastic force of the coil spring is provided, there is an advantage that it can be applied to various models.

In addition, through the above-described common use, there is no need for designing and testing for a separate height adjusting device every time a product is developed, thereby reducing the designing and testing cost and time.

Further, by using a friction member such as POM, the mechanical properties are excellent and the manufacturing cost is reduced.

Claims (15)

A first vertical frame extending in the vertical direction; A second vertical frame extending in the longitudinal direction of the first vertical frame, the second vertical frame being formed to be capable of being drawn in and drawn out from the first vertical frame; An elastic member interposed between the first vertical frame and the second vertical frame to provide an elastic force in a direction in which the second vertical frame is elongated and contracted when the second vertical frame is drawn into the first vertical frame; And And a friction member interposed between the first vertical frame and the second vertical frame to provide a frictional force to maintain the fixed position of the second vertical frame. The method according to claim 1, Wherein the elastic member is a coil spring. The method according to claim 1, Wherein the friction member is formed of POM (Poly Oxyethylene). The method according to claim 1, Wherein the friction member is formed to be wider than an interval between the first vertical frame and the second vertical frame and is interference fit between the first vertical frame and the second vertical frame. Regulating device. The method according to claim 1, And an elastic force adjusting unit is provided on one side of the first vertical frame to adjust an elastic force of the elastic member. 6. The method of claim 5, Wherein the elastic force adjusting unit includes a bolt and an elasticity adjusting plate whose height is adjusted by rotation of the bolt. The method according to claim 1, And a roller for changing the direction of the elastic force provided by the elastic member. The method according to claim 1, And a wire connecting the elastic member to the first vertical frame or the second vertical frame. A first vertical frame extending in the vertical direction and having a depression on one side; A second vertical frame formed with depressions on a side portion corresponding to the depression of the first vertical frame and drawn in and drawn out from the first vertical frame; A friction member inserted between the depressions of the first vertical frame and the second vertical frame; A coil spring for providing a predetermined elastic force to the first vertical frame and the second vertical frame; A first horizontal frame fixedly coupled to the first vertical frame in a direction substantially perpendicular to the first vertical frame; A second horizontal frame fixedly coupled to the second vertical frame in a direction substantially perpendicular to the second vertical frame and moved up and down together with the second vertical frame; A roller coupled to the first horizontal frame to change the direction of the elastic force provided by the coil spring; And And a first wire coupled to the coil spring and the second horizontal frame to transmit an elastic force provided by the coil spring to the second horizontal frame. 10. The method of claim 9, Wherein the coil spring is extended when the second vertical frame is drawn in, and the coil spring is compressed when the second vertical frame is drawn out. 10. The method of claim 9, Wherein a groove is formed in the second horizontal frame so that the second horizontal frame can be moved up and down. 10. The method of claim 9, An elastic force adjusting unit coupled to one side of the first vertical frame to adjust the strength of the elastic force provided by the coil spring; And And a second wire coupled to the coil spring and the elastic force adjusting unit to transmit an elastic force provided by the coil spring to the elastic force adjusting unit. A display unit for displaying a predetermined video signal; A height adjusting device coupled to a back surface of the display unit and including an elastic member and a friction member so that the display unit is moved up and down by the interaction of the elastic member and the friction member and the display unit is kept stationary; An elastic force adjusting unit for adjusting a magnitude of an elastic force provided by the elastic member; And And a base portion for supporting the display portion coupled to the height adjusting device and the height adjusting device. 14. The method of claim 13, Wherein the elastic member is a coil spring. 14. The method of claim 13, Wherein the friction member is formed of POM (Poly Oxy Methylene).

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