KR20190010809A - Bending test apparatus for flexible display - Google Patents

Abstract

The present invention relates to a bending test apparatus for a flexible display. According to the present invention, the bending test apparatus for a flexible display comprises: a motor capable of reversibly rotating; a support member performing an operation of bending and stretching a sample while supporting one surface of the sample; a rotation member gripping one side of the support member and rotating the support member in a rotation direction of the motor while being separated from a driving space where the sample is bent. A bending test in a reversible direction can be repeatedly performed by bending a lower surface of the sample attached to the support member to face based on a vertical surface, and then bending an upper surface of the sample to face based on the vertical surface after stretching the sample in a horizontal direction.

Description

[0001] DESCRIPTION [0002] Bending test apparatus for flexible display [

The present invention relates to a bending test apparatus for a flexible display, and more particularly, to a bending test in which a specimen is folded in one direction by a normal rotation of an electric motor in a bending test for applying physical strain to a flexible display specimen, To a bending test apparatus for a flexible display capable of simultaneously testing a shrinkage strength and a tensile strength of a specimen.

Recently, the display industry has been actively developing flexible displays having flexibility, and various products that are applied to smart phones and high-definition TVs are being launched.

The flexible display is required to have durability and driving stability even when it is bent or folded to a degree of not less than a certain degree, and can display a normal image even in a folded state or a folded state.

As described above, the flexibility of the flexible display is one of the important performances of the flexible display. Therefore, the flexibility of the flexible display can be improved by using unique characteristics such as bending, twisting, and a certain level of stretching It is necessary to develop a device capable of checking performance.

In this connection, [Prior Art Document 1] discloses an apparatus for inspecting the characteristics of a specimen by using a tester which clamps both sides of the specimen and applies mechanical deformation repeatedly to the specimen by actuating the actuator.

However, in the above-mentioned [Prior Art Document 1], when the bending operation is repeated several tens of times while the clamp is fixed very firmly on both sides of the specimen, a locally large stress change occurs at the boundary between the fixed portion and the bending portion There is a problem that a crack may be generated or broken in the specimen.

In order to solve the above problems, in [Prior Art Document 2], a device for performing a bending test in which a test piece is flatly spread on an upper part of a support plate, fixed with an adhesive member, and one of the support plates is rotated to bend the test piece .

In this way, since the test is carried out with the specimen on the plate surface of the support plate, the stress change is reduced compared with the existing technique. However, a series of bending tests are carried out in which the specimen is folded up and returned to its original position The stress concentration in a specific site still remained, which made the reliability of the measurement result lower.

In addition, since the prior art has a structure for individually testing a test piece, it was impossible to simultaneously test a test piece of a similar type, and there was an inconvenience that a longer time was required as the test time increased.

Korean Registered Patent No. 10-0970204 (Registered on July 16, 2010) Korean Registered Patent No. 10-1618078 (Registered on Apr. 28, 2016)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a motor, The bending test apparatus of the flexible display is capable of simultaneously testing the shrinkage strength and the tensile strength of the specimen by repeatedly performing the bending test by folding and unfolding the specimen in the direction of the arrow.

It is another object of the present invention to provide a bending test apparatus for a flexible display which simplifies the structure of the apparatus by reducing the driving load through the tilting member rotated away from the rotating shaft as a power transmitting structure for normally rotating the specimen supporting member .

Another object of the present invention is to provide a test apparatus for a flexible display capable of simultaneously performing a bending test of a plurality of specimens by continuously arranging a supporting member capable of individually fixing a specimen on one rotating member.

The bending test apparatus of the flexible display according to the present invention may include a motor capable of normal and reverse rotations, a support member supporting the one side of the specimen and performing the operation of folding and unfolding the specimen, And a pivoting member for rotating the support member in accordance with the rotation direction of the motor, wherein the lower surface of the specimen attached on the support member is folded so as to face the vertical surface, the specimen is expanded in the horizontal plane direction, The pivoting member is located outside the support member so that the pendulum movement is performed by the rotational force of the motor so that the bending test can be repeated so that the upper surface faces the vertical plane.

The support member may include a first support plate connected to one side of the tiltable member and to which one side of the specimen is attached, and a second support plate attached to the other side of the specimen and spaced apart from the first support plate by a predetermined distance do.

The rotation member is rotatably supported by the rotation of the electric motor such that one end of the rotation member is axially coupled to the electric motor and the other end is coupled to the support member, .

The first and second support plates are rotated in opposite directions to each other as the motor rotates in the forward and reverse directions by the one side of the rotation member being axially coupled to the motor and the other side being coupled to the first support plate using a fastening member, And the first support plate is rotated by the rotational force of the electric motor so as to rotate.

And a connection member for connecting the first support plate and the second support plate so that the second support plate is rotated in association with rotation of the first support plate, wherein the connection member is disposed on both sides of the first and second support plates And the plurality of brackets are coupled to the first and second support plates using a fastening member, and the gear box is fixed to the first support plate And a second gear engaged with the first gear and rotating in a direction opposite to the first gear.

A bending test apparatus of a flexible display according to the present invention is a bending test apparatus for a flexible display, comprising: a motor capable of normal and reverse rotations; a pivoting member rotated by the motor; a first support plate to which one side of the specimen is attached; A plurality of support members having a second support plate spaced apart from the first support plate by a predetermined distance and connected to the pivoting member, The bending of the plurality of specimens attached to the plurality of support members is alternately performed by alternately folding and unfolding the plurality of support members by the motor, The shrinkage strength and the tensile strength can be tested together.

The bending test apparatus of the flexible display according to the present invention tests the shrinkage strength and the tensile strength of the display specimen by repeating the folding operation in a state in which the lower surface of the specimen is fixed to the plate surface of the support member in one direction, There are advantages to be able to.

Further, the bending test apparatus of the flexible display according to the present invention employs a tilting member that rotates away from the rotation axis to transmit a rotational power through gear engagement to interlock one support plate and another support plate, It is possible to prevent the wear and damage of the gear which occurs in case of deviation, and it is easy to repair the trouble and the manufacturing cost of the apparatus can be reduced.

The bending test apparatus of the flexible display according to the present invention can simultaneously perform the bending test of a plurality of specimens by continuously arranging the supporting member capable of individually fixing the specimen on one rotating member, The entire test cost can be reduced, and a plurality of specimens can be measured in a short time.

FIG. 1A is a plan view of a bending test apparatus for a flexible display according to an embodiment of the present invention, and FIG. 1B is a perspective view.
2 is a plan view of a support member according to an embodiment of the present invention.
FIG. 3A is a plan view of a tilting member according to an embodiment of the present invention, and FIG. 3B is a perspective view illustrating a coupling structure of a tilting member and a support member.
4 is a plan view of a connecting member according to an embodiment of the present invention.
FIG. 5A is a plan view showing the coupling between the support member and the coupling member according to the embodiment of the present invention, and FIG. 5B is a perspective view illustrating the coupling structure of the support member and the coupling member.
6A and 6B are sectional views for explaining the operation of the support member according to the embodiment of the present invention.
7 and 8 are a plan view and a side view of a flexible display bending test apparatus according to another embodiment of the present invention.
9 to 15 are photographic images of a flexible display bending test apparatus according to another embodiment of the present invention.

A flexible display literally means a display device in which a screen is bent, folded or stretched like a rubber.

Similar to the elastic deformation characteristics that can be restored to their original state without permanent damage even if temporary structural deformation occurs due to external force, the flexible display must be capable of repeated deformation and recovery to the original state within a certain deformation range.

All components of the flexible display must be capable of withstanding mechanical deformations applied externally, such as at least 10% of longitudinal strain in one axis direction.

That is, all individual elements such as a substrate, various electronic elements for driving, an electrode for electrical connection between elements, and an optical element for screen display must operate normally under given mechanical deformation conditions.

Therefore, testing of mechanical deformation such as expansion and contraction strength and tensile strength after manufacturing a flexible display is a very important item. In the present invention, a bending test apparatus capable of testing both the stretch strength and the tensile strength of the flexible display will be.

Hereinafter, the configuration and operation of the bending test apparatus 1 of the flexible display according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a plan view of a bending test apparatus for a flexible display according to an embodiment of the present invention, and FIG. 1B is a perspective view of the bending test apparatus.

As shown in FIG. 1A, the bending test apparatus 1 of the flexible display according to the present invention includes a motor 10 for providing a rotational force, a support member for performing a folding and unfolding operation of a display specimen F fixedly disposed on a flat plate surface, A rotating member 13 for transmitting the power of the electric motor 10 to the supporting member 20 and a supporting plate 21 and 22 constituting the supporting member 20 for interlocking and rotating the supporting member 20, And a connecting member (30).

The electric motor 10 is a power source for driving the rotary shaft 11 in a forward or reverse direction and a rotary shaft 11 extending from the electric motor 10 is passed through the rotary case 12 to be axially coupled So that the rotational force of the electric motor 10 is transmitted to the rotary member 13.

Meanwhile, although the AC servo motor according to the embodiment of the present invention is used, the present invention is not limited thereto, and various types of motors that rotate in the forward and reverse directions according to the control operation of the controller can be used.

2 is a plan view of a support member according to an embodiment of the present invention.

The support member 20 is a flexible integrated flat plate on which the operation of folding and unfolding the specimen F is performed in a state in which the lower surface of the specimen F is supported.

In this case, since the integrated flat plate is folded or unfolded by the rotational force of the electric motor 10, the bending test can be performed by attaching the specimen F on the flat plate and applying an external force.

However, in order to more precisely control the bending radius, it is more preferable that the support member 20 is formed as a flat plate separated from each other. Hereinafter, the separated support member will be described as an example.

The support member 20 is divided into a first support plate 21 and a second support plate 22 which are flat on the top and the support plates 21 and 22 are spaced horizontally apart from each other. The lower surface of the test piece F can be supported without being bent on the upper surfaces of the support plates 21 and 22. [

The test piece F is mounted on the first support plate 21 on one side and the second support plate 22 on the other side using an adhesive member (not shown) provided on the upper surface of the support plates 21 and 22, As shown in FIG.

On the other hand, first to fourth brackets 37, 38, 39, and 40 are disposed on the upper or lower sides of both side edges of the support plates 21 and 22 for axial coupling with a connection member 30 And fastening holes are formed in the respective brackets so that a plurality of fastening members 61 can be penetrated and fastened.

In addition, shaft fixtures 16a, 16b, 16c, 16d are integrally provided at the ends of the respective brackets so that the rotary shaft for gear engagement can be fixed.

FIG. 3A is a plan view of a tilting member according to an embodiment of the present invention, and FIG. 3B is a perspective view illustrating a coupling structure of a tilting member and a support member.

The pivoting member 13 is a diagonal member including a main body 13a and an engaging portion 13b and is spaced apart from an operating space in which the specimen is folded to be located at the outer periphery of the supporting member, So that the first support plate 21 is rotated.

The coupling portion 13b is axially coupled to the rotary shaft 11 of the electric motor 10 extending in the longitudinal direction through the rotary case 12. One side of the main body 13a is coupled to the coupling member 62 To grip the first support plate 21.

On the other hand, in order to maintain the rotation angle of the tiltable member 13 within the range of 180 degrees, a pedestal 15 is provided on one side surface of the tiltable case 12.

Accordingly, when the electric motor 10 is operated and the rotary shaft 11 rotates in the forward and reverse directions, the rotary member 13 rotates in the vertical direction with respect to the horizontal plane in the same manner as the rotary direction, 13 are rotated in the same direction in the same direction.

By employing the pivoting member 13 according to the embodiment of the present invention as described above, compared to the conventional rotation method by the direct coupling with the motor shaft, a massive member such as a base support for supporting the support plate It is possible to simplify and lighten the device.

Therefore, when the load of the motor is reduced due to the reduction of the operation load of the apparatus, and in particular, when it is necessary to provide a plurality of support plates for simultaneously testing a plurality of specimens, a load is concentrated on the rotary shaft, There are advantages to be able to.

FIG. 4 is a plan view of a connecting member according to an embodiment of the present invention, FIG. 5A is a plan view showing a connection between a supporting member and a connecting member according to an embodiment of the present invention, .

The connecting member 30 is a gear engaging means for rotating the first supporting plate 21 and the second supporting plate 22 interlockingly with each other and rotatably supporting the first supporting plate 21 and the second supporting plate 22 Are gear-coupled.

That is, the first and second brackets 37 and 38 are coupled to the upper or lower sides of both side edges of the first support plate 21 using the fastening members 61, and the first and second gear boxes 31 The first and second main gears 33 and 34 disposed on the first and second brackets 37 and 38 are respectively connected to the first and second brackets 37 and 38 via shaft holders 16a and 16b formed integrally with the first and second brackets 37 and 38, .

The provision of the second gear box 32 at the other corner of the support plates 21 and 22 opposite to the first gear box 31 is achieved by the provision of the first main gear 33 provided on the first gear box 31, When the rotational force of the electric motor 10 is transmitted only by the first driven gear 35 and the first driven gear 35, the fatigue load can be concentrated on one side of the first and second support plates 21 and 22, This can be caused by the following phenomenon.

The third and fourth brackets 39 and 40 are coupled to both sides of the second support plate 22 disposed opposite to the first support plate 21 using a fastening member 61, The first and second driven gears 35 and 36 disposed in the first and second gearboxes 31 and 32 are rotatably supported by shaft holders 16c and 16d, respectively.

The first and second supporting plates 21 and 22 and the first to fourth brackets 37 to 38 and 39 and 40 may be formed of a metal such as aluminum, A fastening hole for inserting the fastening member 61 is formed.

The first main driving gear 33 includes a first main driving shaft 14a extending in the longitudinal direction of the rotating shaft and the first main driving shaft 14a is fixed to one end of the first supporting plate 21 1 through the shaft fixing hole 16a integrally formed with the one bracket 37. [

The second main gear 34 opposed to the first main gear 33 in the same manner includes a second main shaft 14b extending in the longitudinal direction of the rotating shaft, And is axially coupled through a shaft fixing hole 16b integrally formed with a second bracket 38 coupled to the other side edge of the first support plate 21. [

In addition, the first and second driven gears 35 and 36 are disposed opposite to the first and second driven gears 33 and 34, respectively, disposed in the first and second gearboxes 31 and 32, As shown in Fig.

The first driven gear 35 includes a first driven shaft 14c extending in the lengthwise direction of the rotating shaft and the first driven shaft 14c is connected to one end of the second supporting plate 22 3 through a shaft fixing hole 16c formed integrally with the three brackets 39. [

The second driven gear 36, which is opposed to the first driven gear 35 in the same manner, includes a second driven shaft 14d extending in the longitudinal direction of the rotational shaft, and the second driven shaft 14d Is axially coupled through a shaft fixing hole (16d) formed integrally with a fourth bracket (40) coupled to the other edge of the second support plate (22).

The bending test apparatus for a flexible display according to the above-described embodiment is a single test piece, but the present invention is not limited thereto.

That is, as shown in FIG. 1A, the main body 13a of the pivoting member 13 connected to the electric motor 10 disposed on the upper portion of the bending test apparatus 1 according to the present invention is extended in the longitudinal direction, A plurality of first support plates 21 may be provided continuously as in the case where one support plate 21 is further connected to an extended portion of the tiltable member 13. [

The operation of folding and unfolding the support member 20 including the plurality of first support plates 21 and the second support plates 22 is performed by the electric motor 10. [

At this time, in order to smoothly synchronize the engaged gears when the plurality of first support plates 21 are rotated, the coupling of the tiltable member 13 extended to the lower portion of the bending tester 1 And only the rotating case 12 is provided in the portion 13c without a separate electric motor 10. [

6A and 6B are sectional views for explaining the operation of the support member according to the embodiment of the present invention.

Hereinafter, the operation of the bending test apparatus of the flexible display according to the present invention will be described in detail with reference to FIGS. 6A and 6B.

The first and second spur gears 33 and 34 are connected to the first and second driven gears 35 and 36 in the gear boxes 31 and 32, Bite and rotate.

Accordingly, when the first support plate 21 connected to the tiltable member 13 is rotated by the rotation of the electric motor 10, the first and second main shafts 14a and 14b are axially coupled The first and second main gears 33 and 34 rotate in the same direction as the rotating direction of the tiltable member 13.

At this time, since the first and second driven gears 35 and 36 are engaged with the first and second driven gears 33 and 34 and rotate in opposite directions to each other, The first support plate 21 and the second support plate 22 coupled to the driven gears 34 and 34 and the driven gears 35 and 36 also rotate in opposite directions.

That is, when the electric motor 10 is rotated in the forward direction (clockwise direction) in FIG. 6A, the rotating member that is shaft-coupled to the rotating shaft rotates and the first supporting plate 21 coupled thereto is also rotated forward do.

At this time, the second supporting plate 22, which is engaged with the first supporting plate 21, rotates in the opposite direction to the first supporting plate 21, that is, rotates counterclockwise (C2? A) .

The first support plate 21 and the second support plate 22 face each other in the upward direction A with respect to the horizontal plane C1-C2. Therefore, the first support plate 21 and the second support plate 22, The specimen (F), which was fixed in the expanded state at the top, is folded into a U-shape.

6B, when the electric motor 10 rotates counterclockwise, the pivoting member pivotally coupled to the pivot shaft rotates in reverse, and the first supporting plate 21 coupled to the pivoting member also rotates counterclockwise ).

At this time, the second support plate 22, which is engaged with the first support plate 21, is rotated in the clockwise direction (A → C2) in the opposite direction to the first support plate 21 .

The specimen F attached to the first and second support plates 21 and 22 is flatly spread in the horizontal direction C1 to C2 and then rotated by the continuous reverse rotation of the motor 10, 1, the support plate 21 rotates counterclockwise (C1? B), and the second support plate 22 rotates clockwise (C2? B).

The first support plate 21 and the second support plate 22 face each other in the lower direction B with respect to the horizontal plane C1-C2. Therefore, the first support plate 21 and the second support plate 22, The specimen F fixed on the upper part of the specimen B is bent into a U-shape.

Through the above process, the process of folding the specimen F in the upward direction (U shape) with respect to the horizontal plane (C1 - C2), then folding it, and then folding it in the downward direction (∩ shape) is repeated.

As described above, when the bending test apparatus of the flexible display according to the present invention is used, the bending operation is simply repeated in one direction in the prior art, and the bending operation is repeated in the bidirectional 180 degree range, The external force applied can be alternately applied.

That is, in the ∩ shape, a tensile force is applied to the folded upper surface of the specimen F, and a contractive force is applied to the lower surface. In the U shape, a contracting force is applied to the upper surface of the specimen F folded, So that the opposite external force to the tensile and shrinkage characteristics can be tested together at the folded portion of the specimen F.

In addition, since the external force applied to the folded portion of the test piece F can be reversed as described above, the durability of the test piece can be tested under more severe conditions by repeating the contractive force and the tensile force.

In addition, by employing a pivoting member having a simple structure, it is possible to reduce the load of the drive unit for testing the specimen, to repair even when a failure occurs, and to test a plurality of specimens simultaneously, It is possible to reduce the amount of time required for the operation.

7 to 15 are views for explaining a bending test apparatus of a flexible display according to another embodiment of the present invention.

In another embodiment, a technique for modifying the structure of the motor to transmit the rotational force of the motor and the structure of the connecting member, and for monitoring a plurality of test apparatuses arranged in the test chamber using a video camera is disclosed.

1: Bending test apparatus 10: Electric motor
11: rotating shaft 12: rotating case
13: pivoting member 13a:
13b, 13c: engaging portion 14a: first main shaft
14b: second main coaxial shaft 14c: first type coaxial shaft
14d: second type coaxial shaft 15: pedestal
16a, 16b, 16c, 16d: a shaft fixing member 20:
21: first support plate 22: second support plate
30: connecting member 31: first gear box
32: second gear box 33: first main gear
34: second driven gear 35: first driven gear
36: second driven gear 37, 38, 39, 40: first to fourth brackets
61, 62: fastening member

Claims (6)

An electric motor capable of rotating in the normal direction;
A supporting member for supporting the one side of the specimen and performing the folding and spreading of the specimen;
And a pivoting member which grips one side of the support member and rotates the support member according to the rotation direction of the motor,
The bending test is repeated so that the lower surface of the specimen attached on the support member is folded so as to face the vertical plane and then the specimen is expanded in the horizontal plane direction and then the upper surface of the specimen is folded so as to face the vertical plane, Wherein the pivoting member is located outside the support member and performs pendulum movement by the rotational force of the motor.
The method according to claim 1,
Wherein the support member includes a first support plate connected to one side of the pivoting member and to which one side of the specimen is attached and a second support plate attached to the other side of the specimen and spaced apart from the first support plate by a predetermined distance Display bending test apparatus.
The method according to claim 1,
Wherein one end of the tiltable member is axially coupled to the electric motor and the other side is coupled to the support member,
Wherein the support member is rotated by a rotational force of the motor such that the support member rotates in the forward and reverse directions as the motor rotates in the forward and reverse directions.
3. The method of claim 2,
Wherein one end of the pivoting member is axially coupled to the motor and the other end of the pivoting member is coupled to the first support plate using a fastening member,
Wherein the first support plate is rotated by the rotational force of the motor such that the first and second support plates are rotated in opposite and opposite directions as the motor rotates in the forward and reverse directions.
3. The method of claim 2,
And a connecting member connecting the first supporting plate and the second supporting plate such that the second supporting plate is rotated in conjunction with rotation of the first supporting plate,
The connecting member includes a plurality of brackets and gear boxes coupled to both sides of the first and second support plates,
The plurality of brackets are coupled to the first and second support plates using a fastening member,
Wherein the gear box includes a first gear on a rotating shaft axially coupled to the first support plate and a second gear engaged with the first gear and rotating in a direction opposite to the first gear, Bending test apparatus.
An electric motor capable of rotating in the normal direction;
A pivoting member rotated by the electric motor;
A plurality of support members having a first support plate to which one side of the specimen is attached and a second support plate to which the other side of the specimen is attached and which is spaced apart from the first support plate and connected to the pivoting member;
And a connecting member for connecting the first supporting plate and the second supporting plate so that the second supporting plate is rotated in conjunction with rotation of the first supporting plate by the pivoting member,
And bending in the normal and reverse directions with respect to a plurality of specimens attached to the plurality of support members is alternately repeated by collectively folding and unfolding the plurality of support members by the electric motor to produce shrinkage strength and tensile strength together Wherein the bending test apparatus is capable of performing a test on a bending test of a flexible display.

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