CN109256048B - Folding mechanism of flexible screen - Google Patents

The invention discloses a folding mechanism of a flexible screen, which comprises an elastic sheet, a bending joint assembly matched with the elastic sheet and at least one group of synchronous sliding hinge mechanisms; the bending joint component comprises a plurality of joint units; the joint unit comprises a supporting framework, a lower side plate and an upper side plate, wherein the tangent line of the upper side plate and the tangent line of the lower side plate form a certain included angle; when the lower side plates of the plurality of joint units are arranged side by side in a flat manner, two adjacent upper side plates are partially overlapped; triangular limiting blocks are respectively arranged on two end faces of the joint unit; the synchronous sliding hinge mechanism comprises a plurality of synchronous sliding hinge units which are mutually hinged. According to the invention, by means of the design similar to a 'lobster joint' of the bending joint assembly, the outer elastic sheet is attached to the outer side face of each 'lobster joint', so that each joint unit rotates around the contact point, and the inner side and the outer side synchronously bend and bend coaxially in the bending process.

Folding mechanism of flexible screen

Technical Field

The invention relates to a folding mechanism, in particular to a folding mechanism of a flexible screen, and belongs to the technical field of folding mechanisms.

Background

A screen is a device used in an electronic apparatus for displaying images and colors. With the continuous development of science and technology, flexible screens are increasingly used by current electronic devices. In order to meet the increasing demands of small-sized, large-sized screens for electronic devices, the use of flexible screens for foldable displays is becoming a research and development hotspot for current developers.

The inventor finds that when the foldable display is unfolded, the flexible screen at the folding position is difficult to fully flatten, and meanwhile, in the folded state, if the flexible screen is further folded, the flexible screen at the folding position is inevitably damaged to a certain extent, so that the display quality of the foldable display is further influenced, and the use requirement of a user is difficult to meet.

With the continuous popularization of the full screen, the mobile terminal is balanced with better portability while pursuing large screen visual experience, and the physical limit of a single screen is to realize 100% of screen occupation ratio under the grippable size. On the premise of portability, in order to pursue a larger screen, a folding mobile terminal is developed, the existing folding mobile terminal is realized by adopting double screens, obvious splitting sense exists between the two screens after the folding mobile terminal is unfolded, and the perfection of visual effect cannot be realized.

The flexible screen technology development is rapid, except for the flexible screen, the foldable flexible screen also appears, and the whole visual effect of the foldable flexible screen after being unfolded is more perfect because of only one screen. The flexible screen foldable mobile terminal can be divided into an inner bending flexible screen mobile terminal and an outer bending flexible screen mobile terminal according to the position of the folded screen, wherein the screen area where bending occurs is called a deformable screen area. Aiming at the internal bending mobile terminal, the folded screen is inside the mobile terminal and is protected by the shell of the mobile terminal, so that the internal bending mobile terminal has better shock resistance. However, although the internal bending mobile terminal in the prior art can realize folding action, due to the non-stretchable characteristic of the whole screen, the accommodating function of the deformable screen area in the folded state and the supporting function of the deformable screen area in the unfolded state cannot be realized.

Thus, chinese patent application No.: 201810470320.1 discloses a folding mechanism of a flexible screen, a foldable display and an electronic device, the folding mechanism comprising: the first connecting piece, the second connecting piece and the folding assembly are connected and arranged between the first connecting piece and the second connecting piece; the first connecting piece and the second connecting piece can be unfolded and/or folded around the folding assembly, so that when the first connecting piece and the second connecting piece are unfolded to a first preset angle, the folding assembly is in a retracted state, and when the first connecting piece and the second connecting piece are folded to a second preset angle, the folding assembly forms a first accommodating space between the first connecting piece and the second connecting piece. By means of the mode, when the flexible screen is applied to the flexible screen, the flexible screen can be flattened when the flexible screen is unfolded, and damage to the flexible screen at the folding position can be reduced when the flexible screen is folded.

Chinese patent application number 201810078223.8 discloses a collapsible mobile terminal, including flexible screen, flexible transparent cover plate and casing, one side surface of flexible screen with be provided with the first glue film of full screen between the flexible transparent cover plate, flexible screen deviates from the collapsible both ends edge of one side surface of flexible transparent cover plate with the corresponding both ends edge of casing is provided with local second glue film respectively. The foldable mobile terminal is stably fixed in the folding process, does not cause damage to the screen, and has the advantages of reliable structure, good stability and small damage to the screen; and the flexible screen and the shell are partially bonded, so that the folding area where the flexible screen and the shell are in contact has relative displacement, and the tensile stress of the shell to the screen when the flexible screen is bent can be effectively reduced.

However, the folding mechanisms have certain gaps on the outer side surface and the inner side surface in the opening and closing process; or the distance between the outer side surface and the inner side surface is changed, and the inner and outer synchronization cannot be maintained.

Disclosure of Invention

The invention aims to provide a folding mechanism of a flexible screen, so as to solve the technical problems in the prior art.

The aim of the invention is achieved by the following technical scheme.

A folding mechanism of a flexible screen comprises an elastic sheet, a bending joint assembly matched with the elastic sheet and at least one group of synchronous sliding hinge mechanisms; the bending joint component comprises a plurality of joint units, and the two types of the joint units are as follows: the first joint unit is positioned in the middle, and the second joint units are distributed on two sides of the first joint unit; the joint unit comprises a supporting framework, a lower side plate and an upper side plate, wherein the upper side plate and the lower side plate are respectively arranged on the upper side and the lower side of the supporting framework; the tangent line of the upper side plate and the tangent line of the lower side plate form a certain included angle, the included angle at the left side of the first joint unit is positive, and the included angle at the right side of the first joint unit is negative; when the lower side plates of the plurality of joint units are arranged side by side in a flat manner, two adjacent upper side plates are partially overlapped; the lower side surface of the lower side plate is fixed with the elastic sheet; triangular limiting blocks are respectively arranged on two end faces of the joint units, the bottom edges of the limiting blocks are flush with the lower side plate, and the waist, close to the symmetrical surface, of the limiting block of the second joint unit is flush with the side face of the corresponding joint unit; the synchronous sliding hinge mechanism comprises a plurality of synchronous sliding hinge units which are hinged with each other, the synchronous sliding hinge units correspond to the joint units one by one, and the synchronous sliding hinge units are fixed with the upper side of the lower side plate.

The limiting block is an isosceles triangle; the vertex angle is 180 degrees/(the limiting block number is +1). Preferably 30 degrees. This limitation is not necessarily the case, but also the angle of the lower side plate to the elastic sheet (flexible screen).

Further, the lower side plate and the elastic sheet are fixed by bonding or welding. Further, when the elastic sheet is bent to be parallel, two adjacent limiting blocks are closely abutted against each other.

Further, the section line of the upper side plate is an upward curved arc, and the arc is an arc on the same circle. Further, the arc length of the upper side plate of the first joint unit is twice that of the upper side plate of the second joint unit.

Further, the lower side plate interface county is an upward curved arc; and the circular arcs are circular arcs on the same circle.

Further, the synchronous sliding hinge unit comprises a fixed seat with a shaft hole; the two adjacent fixing seats are connected through a connecting rod assembly, and the connecting rod assembly consists of two connecting rods; the fixed seat is movably connected with the connecting rod assembly through a first pin shaft; the two connecting rods are movably connected through a second pin shaft.

Furthermore, friction gaskets are arranged between the fixed seat and the connecting rod and between the connecting rod and the connecting rod.

The synchronous sliding hinge mechanism is provided with two groups which are respectively arranged at the positions of the bending joint component close to the two ends.

The chain type hinge comprises two half gears, two hinge pin shafts and two fixing plates with two shaft holes; the fixed plate is arranged at two ends of the half gears, and the two half gears are matched with the shaft holes on the fixed plate through two hinge pins and meshed with each other; the half gear extends along the tangential direction to form a connecting arm, and the end part of the connecting arm is provided with a sliding pin; the elastic sheet is provided with a sliding frame, the sliding frame is of a U-shaped structure, and the inner wall of the sliding frame is provided with a sliding groove matched with the sliding pin. Since a relative displacement occurs between the carriage and the slide pin during the rotation of the half-gear, the influence of the relative displacement is eliminated by the movement of the slide pin in the slide groove.

Further, a friction pad coaxial with the pin is mounted between the end face of at least one of the fixed plates and the hinge pin.

The outside of the elastic sheet can be provided with a frame, and the outside of the frame is provided with a flexible screen of a mobile phone or a computer.

The terms "left" and "right", "upper" and "lower" in the description of the present invention are merely for convenience of description, and are not limiting of the product, but are interchangeable in practice due to the angles and placements.

The invention has the following beneficial effects:

1. According to the invention, by means of the design similar to a 'lobster joint' of the bending joint assembly, the outer elastic sheet is attached to the outer side face of each 'lobster joint', so that each joint unit rotates around the contact point, and the inner side and the outer side synchronously bend and bend coaxially in the bending process.

2. The torsion force in the folding process is provided by the arrangement of the synchronous sliding hinge mechanism; the synchronous sliding hinge mechanism is arranged in parallel and series through the connecting rods, when the distance between the fixed seats is reduced during rotation, the connecting rod connecting points can automatically adjust the angle to absorb the distance, so that the chain hinge structural member is not subjected to extrusion force or tension force; the length of the flexible screen attached to the outer side surface is ensured to be unchanged or changed slightly.

3. In the closing process, the chain hinge ensures that the frames on two sides are synchronous, and simultaneously, in order to ensure that the outer side distance is unchanged, sliding mechanisms on two sides of the hinge start to shrink inwards along the sliding track to compensate the distance.

Drawings

FIG. 1 is a schematic view of the mounting structure of the present invention;

FIG. 2 is a schematic view of the mounting structure of the present invention;

FIG. 3 is a schematic view of the mounting structure of the flexure joint assembly of the present invention;

FIG. 4 is a schematic view of the bending joint assembly of the present invention in an open configuration;

FIG. 5 is a schematic view of the flexure joint assembly of the present invention in a closed configuration;

FIG. 6 is a schematic view of the mounting structure of the synchronous sliding hinge mechanism of the present invention;

FIG. 7 is a schematic view showing an opened state structure of the synchronous sliding hinge mechanism of the present invention;

FIG. 8 is a schematic view showing a closed state structure of the synchronous sliding hinge mechanism of the present invention;

FIG. 9 is a schematic view of the mounting structure of the chain hinge of the present invention;

FIG. 10 is a schematic view of the chain hinge of the present invention in an open configuration;

FIG. 11 is a schematic view showing a closed state of the chain hinge of the present invention;

In the drawings, 10, a bending joint assembly; 11. a first joint unit; 12. a second joint unit; 13. a support skeleton; 14. a lower side plate; 15. an upper side plate; 16. a limiting block; 20. a synchronous sliding hinge mechanism; 21. a mounting base; 22. a connecting rod; 23. a first pin; 24. a second pin; 30. a chain hinge; 31. a half gear; 32. a fixing plate; 33. a hinge pin; 34; a sliding pin; 35. a connecting arm; 36. a carriage; 37. a chute; 40. an elastic sheet; 50. and a frame.

Detailed Description

The technical features of the present invention are further described below with reference to the accompanying drawings and the specific embodiments.

A folding mechanism for a flexible screen as shown in fig. 1-11, comprising an elastic sheet 40 and a bending joint assembly 10 mated with the elastic sheet 40, and at least one set of synchronous sliding hinge mechanisms 20; the flexion joint assembly 10 includes a plurality of articulation units, two of which are: a first joint unit 11 positioned in the middle and second joint units 12 distributed at both sides of the first joint unit 11; the joint unit comprises a supporting framework 13, a lower side plate 14 and an upper side plate 15, wherein the upper side plate 15 and the lower side plate 14 are respectively arranged on the upper side and the lower side of the supporting framework 13; the tangent line of the upper side plate 15 and the tangent line of the lower side plate 14 form a certain included angle, the included angle at the left side of the first joint unit 11 is positive, and the included angle at the right side is negative; when the lower side plates 14 of a plurality of joint units are arranged side by side in a flat manner, two adjacent upper side plates 15 are partially overlapped; triangular limiting blocks 16 are respectively arranged on two end faces of the joint units, the bottom edges of the limiting blocks 16 are flush with the lower side plate 14, and the limiting blocks 16 on the second joint unit 12 are flush with the side faces of the corresponding joint units near the waist of the first joint unit 11; the synchronous sliding hinge mechanism 20 comprises a plurality of synchronous sliding hinge units hinged with each other, wherein the synchronous sliding hinge units correspond to the joint units one by one, and the synchronous sliding hinge units are fixed with the upper side of the lower side plate.

The limiting block 16 is an isosceles triangle; the vertex angle is 180 degrees/(the limiting block number is +1). Preferably 30 degrees. This limitation is not necessarily the case, but also the angle of the lower side plate to the elastic sheet (flexible screen).

The lower side of the lower side plate 14 is fixed to an elastic sheet 40, and preferably, the lower side plate 14 is fixed to the elastic sheet 40 by bonding or welding. Further, when the elastic sheet 40 is bent to be parallel, the adjacent stoppers 14 are closely abutted against each other.

Further, the section line of the upper side plate 15 is an upwardly curved arc, and the arc is an arc on the same circle. Further, the arc length of the upper side plate 15 of the first joint unit 11 is twice that of the upper side plate of the second joint unit 12.

Further, the section line of the lower side plate 14 is an upward curved arc; and the circular arcs are circular arcs on the same circle.

Further, the synchronous sliding hinge unit 20 includes a fixing seat 21 with a shaft hole; the two adjacent fixing seats 21 are connected through a connecting rod assembly, and the connecting rod assembly consists of two connecting rods 22; the fixed seat 21 is movably connected with the connecting rod assembly through a first pin 23; the two connecting rods 22 are movably connected through a second pin shaft 24.

Further, friction pads are disposed between the fixing base 21 and the connecting rod 22, and between the connecting rod 22 and the connecting rod 22.

The synchronous sliding hinge mechanism 30 is provided with two groups, which are respectively arranged at the positions of the bending joint assembly 10 close to the two end parts.

The chain hinge comprises at least one group of chain hinges 30, and comprises two half gears 31, two hinge pin shafts 33 and two fixing plates 32 with two shaft holes; the fixed plates 32 are arranged at two ends of the half gears 31, and the two half gears 31 are matched and meshed with the shaft holes on the fixed plates 33 through two hinge pin shafts 32; the half gear 31 extends in a tangential direction to form a connecting arm 35, and a sliding pin 34 is arranged at the end part of the connecting arm 35; the elastic sheet 40 is provided with a sliding frame 36, the sliding frame 36 is of a U-shaped structure, and the inner wall of the sliding frame 36 is provided with a sliding groove 37 matched with the sliding pin 34. Since a relative displacement occurs between the carriage and the slide pin during rotation of the half gear 31, the influence of the relative displacement is eliminated by the movement of the slide pin in the slide groove.

Further, a friction pad coaxial with the pin is mounted between the end face of at least one of the fixing plates 33 and the hinge pin 32.

The outer side of the elastic sheet 40 can be provided with a frame 50, and the outer side of the frame is provided with a flexible screen of a mobile phone or a computer.