A folding display device and a folding mobile phone

Abstract

This invention proposes a folding display device and a folding screen phone including the same, comprising a folding hinge, a mid-frame and a hinge cover plate connected by the folding hinge, and a dustproof filler is provided between the mid-frame and the hinge cover plate, the dustproof filler being tightly bonded to both the mid-frame and the hinge cover plate. The folding display device of this invention features a specially structured dustproof filler at the mid-frame and hinge cover plate, ensuring smooth rotation while preventing dust from entering, protecting the hinge and display module, and improving the overall folding reliability of the device.

Description

Technical Field

[0001] This invention relates to the field of foldable screen mobile phone technology, and more particularly to a foldable display device and a foldable mobile phone including the same. Background Technology

[0002] With the continuous upgrading of mobile phones, their hardware configurations have become increasingly powerful, and network speeds have become faster. As a result, people have increasingly demanded larger phone screens. Larger screens significantly improve user experience and visual effects, especially in business communication, gaming, reading novels, and watching movies. However, increasing the screen size of existing phones results in a larger overall device size, making them less portable. Currently available foldable phones adopt a book-like bi-fold design, where the screen can fold inwards or outwards. This allows the phone to switch between a smaller folded size and a larger open size, making it increasingly popular among consumers.

[0003] Existing foldable phones consist of two mid-frames and a hinge connecting them. Due to the hinge structure, a gap is left between the rear center cover and the mid-frame to prevent interference or friction during rotation, which could affect the feel or cause malfunction. Because of this gap, dust, sand, and other particles can enter the hinge and display module during use, leading to wear and tear on the hinge and damage to the foldable display module during subsequent bending.

[0004] To alleviate this problem, a common solution is to attach a brush-like structure to the gap to prevent dust or sand from entering. However, this structure has a limited lifespan and there is a risk that the brush may fall off and get stuck in the hinge. Summary of the Invention

[0005] To address the aforementioned technical issues, this invention proposes a foldable display device and a foldable mobile phone. A special structure is designed at the mid-frame and hinge cover to prevent sand and dust from entering, protecting the hinge and display module and improving folding reliability.

[0006] A first aspect of the present invention provides a folding display device, including a folding hinge, and a middle frame and a hinge cover plate connected by the folding hinge, wherein a dustproof filler is provided between the middle frame and the hinge cover plate, and the dustproof filler is tightly combined with the middle frame and the hinge cover plate respectively.

[0007] In one embodiment, the dustproof filler is formed of an ultra-thin high-strength material. The dustproof filler is in the form of an ultra-thin sheet. A plurality of the dustproof fillers are symmetrically arranged at both ends of the cover plate. One end of the dustproof filler is connected to the hinge cover plate, and the other end is bent in the opposite direction and connected to the inner side of the middle frame to form a full blocking structure. The dustproof filler is in an unfolded / folded state as the folding display device unfolds / folds.

[0008] In one embodiment, the ultrathin sheet-like dustproof filler is formed of a high-strength metal or polymer material with a thickness of 15-30 μm.

[0009] In one embodiment, the two ends of the ultra-thin sheet-like dustproof filler are connected to the middle frame and the hinge cover plate respectively by bonding, spot welding or riveting.

[0010] In one embodiment, the dustproof filler is a winding and unwinding mechanism disposed between the middle frame and the hinge cover plate. The winding and unwinding mechanism is formed by winding a high-strength ultra-thin metal material from the middle to the ends to form a central spool. The central spool is disposed in the middle of the hinge cover plate along the folding axis of the folding display device. The two ends of the winding and unwinding mechanism extend outward and are respectively connected to the inner side of the middle frame. A dustproof film is stored inside the winding and unwinding mechanism and the dustproof film is kept in a taut state, so that the dustproof film is pulled out when the folding display device is folded and pulled in when it is unfolded.

[0011] In one embodiment, the dustproof filler consists of two winding and unwinding mechanisms disposed between the middle frame and the hinge cover. The two winding and unwinding mechanisms are symmetrically arranged relative to the hinge cover. Each winding and unwinding mechanism is formed by winding a high-strength, ultra-thin metal material from the middle to the end to form a central spool. The central spool is arranged along the folding axis of the folding display device. One end of one winding and unwinding mechanism extends outward and connects to the inner side of one side of the middle frame, while the other end of the other winding and unwinding mechanism extends outward and connects to the inner side of the other side of the middle frame. Each winding and unwinding mechanism contains a dustproof film, which is kept taut, so that the dustproof film is pulled out when the folding display device is folded and pulled in when it is unfolded.

[0012] In one embodiment, the hinge cover plate has a cover plate groove extending along the folding axis of the folding display device in the middle, and the middle roller of the winding and unwinding mechanism is disposed in the cover plate groove.

[0013] In one embodiment, the two ends of the winding and unwinding mechanism are respectively connected to the middle frame by bonding, spot welding or riveting.

[0014] In one embodiment, the two winding and unwinding mechanisms are disposed in one or two cover plate grooves. When the two winding and unwinding mechanisms are disposed in one cover plate groove, the gap between the two winding and unwinding mechanisms is not less than 0.2 mm. When the two winding and unwinding mechanisms are disposed in two cover plate grooves, the two cover plate grooves are symmetrically placed on the left and right sides relative to the hinge cover plate, and the gap between the two cover plate grooves is not less than 0.3 mm.

[0015] In one embodiment, an intermediate bearing is provided at the center of the winding and unwinding mechanism, the central roll is wound around the intermediate bearing, and the end of the intermediate bearing is fixedly connected to the hinge cover plate.

[0016] In one embodiment, the dustproof filler includes cylindrical rollers disposed at the middle frame and the hinge cover plate. The two ends of the middle frame are respectively provided with middle frame grooves disposed along the folding axis of the folding display device. The cylindrical rollers are respectively disposed in the middle frame grooves and are in close contact with the hinge cover plate and the middle frame.

[0017] In one embodiment, an elastic element is provided between the cylindrical roller and the middle frame, so that the cylindrical roller and the hinge cover plate are always in close contact.

[0018] In one embodiment, the cylindrical roller is interference-fitted with the middle frame and the hinge cover plate.

[0019] In one embodiment, the cylindrical roller is provided with a coaxial central shaft at its center, and the cylindrical roller is fixedly connected to the hinge cover plate through the end of the coaxial central shaft.

[0020] In one embodiment, auxiliary cylindrical rollers are respectively provided on the inner side of the hinge cover plate, and the auxiliary cylindrical rollers are respectively in close cooperation with the hinge cover plate.

[0021] A second aspect of the present invention provides a foldable screen mobile phone, including the foldable display device described in any one or a combination of the above-described items.

[0022] Compared with the prior art, the folding display device of the present invention has a specially designed dustproof filler at the middle frame and the hinge cover plate, which prevents sand and dust from entering while ensuring smooth rotation, protects the hinge and display module, and improves the overall folding reliability.

[0023] The above-mentioned technical features can be combined in various technically feasible ways to produce new implementation schemes, as long as the purpose of the present invention can be achieved. Attached Figure Description

[0024] The invention will now be described in more detail based on embodiments that are merely non-limiting and with reference to the accompanying drawings. Wherein:

[0025] Figure 1 A schematic diagram of the structure of Embodiment 1 of the foldable display device according to the present invention is shown;

[0026] Figure 2 Showing Figure 1 A partial enlarged view of Example 1;

[0027] Figure 3 Showing Figure 1 A schematic diagram of the folded state of Example 1;

[0028] Figures 4-5 Showing Figure 3 A partial schematic diagram of the folded state in the image;

[0029] Figure 6 A schematic diagram of an embodiment 2 of the foldable display device according to the present invention is shown;

[0030] Figure 7 Showing Figure 6 A partial enlarged view of Example 2;

[0031] Figure 8 Showing Figure 6 Schematic diagram of the explosion state in Example 2;

[0032] Figure 9 Showing Figure 6 A schematic diagram of the folded state in Example 2;

[0033] Figure 10 Showing Figure 6 A partial schematic diagram of the folded state in Example 2;

[0034] Figure 11 A schematic diagram of the structure of Embodiment 3 of the foldable display device according to the present invention is shown;

[0035] Figure 12 A schematic diagram of the structure of Embodiment 4 of the foldable display device according to the present invention is shown;

[0036] Figure 13 Showing Figure 12 A schematic diagram of the folded state in Example 4;

[0037] Figure 14 A schematic diagram of the structure of embodiment 5 of the foldable display device according to the present invention is shown;

[0038] Figure 15 Showing Figure 13 A schematic diagram of the folded state in Example 5;

[0039] Figure 16 A schematic diagram of the structure of Embodiment 6 of the foldable display device according to the present invention is shown;

[0040] Figure 17 Showing Figure 13 A schematic diagram of the folded state in Example 6.

[0041] In the figures, identical components are labeled with the same reference numerals. The figures are not drawn to scale.

[0042] The attached figures are labeled as follows:

[0043] 1. Middle frame; 11. Middle frame groove; 2. Hinge cover plate; 21. Cover plate groove; 3. Dustproof filler; 31. Full blocking structure; 32. Winding and unwinding mechanism; 321. Middle roll; 322. End of winding and unwinding mechanism; 33. Cylindrical roller; 4. Auxiliary cylindrical roller; 5. Elastic element. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the various embodiments and features in each embodiment of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0045] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0046] Existing foldable phones consist of two mid-frames and a hinge connecting them. Due to the hinge structure, a gap is left between the rear center cover and the mid-frame to prevent interference or friction during rotation, which could affect the feel or cause malfunction. Because of this gap, dust, sand, and other particles can enter the hinge and display module during use, leading to wear and tear on the hinge and damage to the foldable display module during subsequent bending.

[0047] To alleviate this problem, the present invention proposes a folding display device, including a folding hinge, and a middle frame 1 and a hinge cover plate 2 connected by the folding hinge. A dustproof filler 3 is provided between the middle frame 1 and the hinge cover plate 2, and the dustproof filler 3 is tightly combined with the middle frame 1 and the hinge cover plate 2 respectively.

[0048] The folding display device of the present invention prevents dust from entering the folding hinge and the interior of the display module by cooperating with the dustproof filler 3, the middle frame 1 and the hinge cover plate 2, thereby improving the folding reliability.

[0049] The following describes different embodiments of the foldable display device of the present invention with specific examples.

[0050] Example 1

[0051] like Figures 1-5 As shown, an embodiment of the present invention is illustrated. The dustproof filler 3 of the folding display device of the present invention is formed of an ultra-thin sheet-like dustproof filler made of an ultra-thin high-strength material. The ultra-thin sheet-like dustproof filler 3 is respectively disposed between the end of the hinge cover plate 2 and the gap between the middle frame 1. Figure 2As shown, one end of the ultra-thin sheet-like dustproof filler 3 is bent and connected to the end of the hinge cover plate 2, and the other end is bent in the opposite direction and connected to the inner side of the middle frame 1 to form a comprehensive blocking structure 31, thereby preventing dust or sand from entering.

[0052] When the foldable display device is unfolded or folded, the thin dustproof filler 3, i.e. the full blocking structure 31, will be unfolded / folded along with the unfolding / folding of the foldable display device.

[0053] In this embodiment, Figures 1-5 The illustration shows two ultra-thin sheet-like dustproof fillers 3. In other embodiments, multiple ultra-thin sheet-like dustproof fillers 3 may be provided, such as 4, 6 or 8, which are symmetrically arranged at both ends of the hinge cover plate 2. The specific number can be selected by those skilled in the art according to the specific implementation.

[0054] In this embodiment, the folding display device, by forming an ultra-thin sheet-like all-around blocking structure 31 between the hinge cover plate 2 and the middle frame 1, not only meets the reciprocating folding requirements, but also prevents sand and dust from entering the folding hinge or display module through all-around blocking. Figure 1 and Figure 3 The images show the folded / unfolded states of the dustproof filler as the folded display device is folded / unfolded.

[0055] In an optional embodiment, the ultra-thin sheet-like dustproof filler 3 needs to meet the requirements of both ultra-thinness and high strength. Therefore, it can be formed from a high-strength metal material with a thickness of no more than 30 μm, such as stainless steel (SUS), copper (Cu), or a polymer material, such as polyimide (PI).

[0056] For example, optionally, the ultra-thin sheet-like dustproof filler 3 can be formed of ultra-thin high-strength stainless steel material with a thickness of 15-30 μm. Optionally, the thickness of the stainless steel material can be 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 30 μm, etc.

[0057] In an optional embodiment, the two ends of the ultra-thin sheet-like dustproof filler 3 can be connected to the middle frame 1 and the hinge cover plate 2 respectively by bonding, spot welding or riveting.

[0058] The total length of the ultra-thin sheet-like dustproof filler 3 material needs to be defined according to the actual size requirements of the folded and unfolded states. If the length of the dustproof filler 3 material is too long or too short, it will affect the folding effect of the folding display device. Optionally, the difference between the total length of the dustproof filler 3 material and the sum of the connection width of the material at the hinge cover plate 2, the length of the connecting material in the folded state, and the connection width of the material at the middle frame 1 is 1–3 mm, where 1–3 mm is a buffer amount to ensure its folding and dustproof effect. Optionally, the buffer amount can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm, etc.

[0059] In other alternative embodiments, when the ultra-thin sheet-like dustproof filler 3 is made of a polymer material, such as polyimide (PI) to form a full-coverage barrier structure 31, its two ends can be bonded to the inner side of the middle frame 1 and the hinge cover plate 2 by adhesive. For example, during the connection, ultra-thin double-sided tape is used to bond the dustproof filler 3 to the middle frame 1 and the hinge cover plate 2. Ultra-thin double-sided tape refers to double-sided tape with a thickness of no more than 30μm, such as 15μm, 20μm, 23μm, 25μm, or 30μm. The connection width between the dustproof filler 3 and the double-sided tape and the middle frame 1 and the hinge cover plate 2 must be no less than 0.5mm, optionally 0.5mm, 0.6mm, 0.6mm, 0.65mm, 0.7mm, or 0.8mm, to ensure reliable bonding.

[0060] In another alternative embodiment, when the ultra-thin sheet-like dustproof filler 3 is formed of a metal material, for example, a full-coverage barrier structure 31 formed of stainless steel, its two ends can be connected by spot welding or riveting. Compared to connecting with double-sided adhesive, the connection method of spot welding or riveting of metal materials is more reliable.

[0061] Example 2

[0062] like Figures 6-10 As shown, the folding display device of this embodiment provides a second form of dustproof filler 3. The dustproof filler 3 of the folding display device of this embodiment is a winding and unwinding mechanism 32 disposed between the middle frame 1 and the hinge cover plate 2. The winding and unwinding mechanism 32 is formed by winding a high-strength ultra-thin metal material from the middle to the ends to form a middle scroll 321. The middle scroll 321 is disposed in the middle position of the hinge cover plate 2 along the folding axis direction of the folding display device. The two ends 322 of the winding and unwinding mechanism 32 extend outward and are respectively connected to the inner side of the middle frame 1. A dustproof film is inserted into the winding and unwinding mechanism 32 and the dustproof film is kept in a taut state.

[0063] The dustproof film is pulled out from the winding and unwinding mechanism 32 when the foldable display device is folded, and is put back into the winding and unwinding mechanism 32 when the foldable display device is unfolded. This completely isolates the hinge module from the outside environment, preventing sand and dust from entering the folding hinge and the interior of the display module, thus achieving a sand and dust protection effect during folding.

[0064] Optionally, the shortest length of the unwinding mechanism 32 (i.e., the dustproof film being pulled out) is 1-2 mm larger than the sum of twice the fixed width of the middle frame 1 and the outer perimeter of the folded cover plate. This 1-2 mm is a redundancy, designed to ensure the dustproof film can be pulled out more smoothly, achieving the dustproof effect. The redundancy can be selected as 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, or 2 mm, etc.

[0065] Because the dustproof film needs to be kept taut, it is always under tensile stress. Therefore, the material of the winding and unwinding mechanism 32 must be made of high-strength, ultra-thin (thickness not exceeding 30 μm) stainless steel or copper alloy. Optionally, the material thickness is 15–30 μm, and in other optional configurations, it is 20–30 μm. For example, it can optionally be 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, or 30 μm, etc.

[0066] In an optional embodiment, a cover plate groove 21 extending along the folding axis of the folding display device is provided in the middle of the hinge cover plate 2, and the middle roll 321 of the winding and unwinding mechanism 32 is disposed in the cover plate groove 21. The depth of the cover plate groove 21 can be set according to the thickness of the hinge cover plate 2, wherein the depth direction of the cover plate groove 21 is in the same direction as the thickness direction of the hinge cover plate 2.

[0067] Optionally, to ensure the rigidity of the folding display device, the difference between the original thickness of the hinge cover plate 2 and the depth of the cover plate groove 21 is 0.15–0.2 mm; that is, after the cover plate groove 21 is provided, the remaining thickness of the hinge cover plate 2 is 0.15–0.20 mm. Optionally, the remaining thickness of the hinge cover plate 2 can be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, or 0.2 mm.

[0068] In one specific embodiment, the difference between the original thickness of the hinge cover plate 2 and the depth of the cover plate groove 21 is 0.15mm. That is, after the cover plate groove 21 is provided, the remaining thickness of the hinge cover plate 2 is 0.15mm.

[0069] In other alternative embodiments, since a winding and unwinding mechanism 32 is provided between the hinge cover plate 2 and the middle frame 1, even though a cover plate groove 21 is provided on the hinge cover plate 2 to accommodate the middle roll 321 of the winding and unwinding mechanism 32, the middle frame 1 also needs to make way for the middle roll 321 at the corresponding position.

[0070] Optionally, the difference between the total thickness of the middle frame 1 and the clearance height at the corresponding position of the middle frame 1 is 0.15mm to 0.2mm. That is, after the middle frame 1 makes way for the central scroll 321, the remaining thickness of the middle frame 1 is 0.15mm to 0.2mm. Optionally, the remaining thickness of the middle frame 1 can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, or 0.2mm.

[0071] In one specific embodiment, the difference between the total thickness of the middle frame 1 and the clearance height at the corresponding position of the middle frame 1 is not less than 0.15mm. That is, after the middle frame 1 makes way for the central scroll 321, the remaining thickness of the middle frame 1 should not be less than 0.15mm.

[0072] In one specific embodiment, such as Figure 6 As shown, the hinge cover plate 2 is provided with a cover plate groove 21, and the middle frame 1 avoids the middle scroll 321. The remaining thickness b1 of the hinge cover plate 2 and the remaining thickness b2 of the middle frame 1 are both not less than 0.15mm, thereby ensuring the rigidity of the folding display device.

[0073] The difference between the width of the cover plate groove 21, the depth of the cover plate groove 21, the clearance height of the corresponding position of the middle frame 1, and the gap between the hinge cover plate 2 and the middle frame 1 is 0.1 to 0.55 mm. Here, 0.1 to 0.55 mm is a buffer value. Optionally, the buffer value can be 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, or 0.55 mm, etc.

[0074] In other alternative embodiments, an intermediate bearing (not shown in the figure) may be provided at the center of the winding and unwinding mechanism 32, with the central roll 321 wound around the intermediate bearing, and the end of the intermediate bearing fixed to the hinge cover plate 2. By providing an intermediate bearing that is fixedly connected to the hinge cover plate 2, the stability of the connection between the winding and unwinding mechanism 32 and the hinge cover plate 2 is further improved, and the shaking of the winding and unwinding mechanism 32 is prevented.

[0075] In an optional embodiment, the end of the winding / unwinding mechanism 32 can be fixed to the middle frame 1 by bonding with ultra-thin double-sided adhesive, spot welding, or riveting. Since the winding / unwinding mechanism 32 is formed of ultra-thin metal material, spot welding or riveting is preferred as a fixing method.

[0076] In other alternative embodiments, since the end of the middle roll 321 of the winding and unwinding mechanism 32 is exposed, a decorative plate can be provided at the end of the middle roll 321 to cover the winding and unwinding mechanism 32 in order to ensure aesthetics.

[0077] In an alternative embodiment, the central roll 321 of the winding and unwinding mechanism 32 is arranged along the folding axis of the folding display device, and the two ends of the central roll 321 are respectively aligned with the edges of the middle frame 1 or the hinge cover plate 2.

[0078] Example 3

[0079] like Figure 11 As shown, this embodiment 3 is an improvement on embodiment 2. Two winding and unwinding mechanisms 32 are provided between the middle frame 1 and the hinge cover plate 2. The two winding and unwinding mechanisms 32 have the same or symmetrical structure. They are both formed by winding high-strength ultra-thin metal material from the middle to the end to form a middle scroll 321. The middle scroll 321 is arranged along the folding axis of the folding display device. One end 322 of one winding and unwinding mechanism 32 extends outward and connects to one side of the middle frame 1. The other end 322 of the other winding and unwinding mechanism 32 extends outward and connects to the other side of the middle frame 1. Dustproof films are respectively stored in the winding and unwinding mechanisms 32 and the dustproof films are kept in a taut state.

[0080] Optionally, the two winding and unwinding mechanisms 32 can be arranged symmetrically on the left and right sides relative to the hinge cover plate 2. In other optional embodiments, those skilled in the art can also choose specific symmetrical or asymmetrical arrangements according to actual conditions.

[0081] like Figure 11 As shown in the figure, in the embodiment shown in the figure, the connection between the two winding and unwinding mechanisms 32 and the middle frame can be as follows: one winding and unwinding mechanism 32 extends outward from the end near the middle frame 1 and connects to the inner side of the middle frame 1, and the other winding and unwinding mechanism 32 extends outward from the end near the hinge cover plate 2 and connects to the inner side of the middle frame 1, so as to better achieve the dustproof effect and reduce or prevent sand and dust from entering the hinge or display module.

[0082] In other alternative embodiments, those skilled in the art can select the specific connection method according to the actual situation. For example, the winding and unwinding mechanism 32 can extend outward from the end near the middle frame 1 and connect to the inner side of the middle frame 1; or the winding and unwinding mechanism 32 can extend outward from the end near the hinge cover plate 2 and connect to the inner side of the middle frame 1.

[0083] In other alternative embodiments, a cover plate groove 21 extending along the folding axis of the folding display device is also provided in the middle of the hinge cover plate 2, and the middle roller 321 of the winding and unwinding mechanism 32 is disposed in the cover plate groove 21. The two winding and unwinding mechanisms 32 may be disposed in the same cover plate groove 21 or separately in two different cover plate grooves 21.

[0084] like Figure 11As shown, when the middle rolls 321 of the two winding and unwinding mechanisms 32 are arranged in the same cover plate groove 21, the gap between the two winding and unwinding mechanisms 32 must be no less than 0.2mm. Optionally, the gap between the two winding and unwinding mechanisms 32 can be 0.2mm, 0.25mm, 0.28mm, 0.3mm or 0.35mm.

[0085] When the middle rolls 321 of the two winding and unwinding mechanisms 32 are positioned within the two cover plate grooves 21 (not shown in the figure), the two cover plate grooves 21 are symmetrically placed relative to the hinge cover plate 2, and the interval between the two cover plate grooves 21 is not less than 0.3 mm. Optionally, the interval between the two cover plate grooves 21 can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm.

[0086] Example 4

[0087] This embodiment 4 is an improvement on embodiment 2 or embodiment 3. The winding and unwinding mechanism 32 can be set inside the hinge cover plate 2 (not shown in the figure), which can achieve the dustproof effect of embodiment 2 and embodiment 3 while also being aesthetically pleasing.

[0088] Example 5

[0089] like Figure 12 and Figure 13 As shown, the folding display device of this embodiment provides a third form of the dustproof filler 3. The dustproof filler 3 of the folding display device of the present invention is a cylindrical roller 33 disposed between the middle frame 1 and the hinge cover plate 2. The two ends of the middle frame 1 are respectively provided with middle frame grooves 11 disposed along the folding axis of the folding display device. The cylindrical rollers 33 are respectively disposed in the middle frame grooves 11 at the ends of the middle frame 1, and the cylindrical rollers 33 are respectively tightly engaged with the hinge cover plate 2.

[0090] In this embodiment, a cylindrical roller 33 is provided between the middle frame 1 and the hinge cover plate 2 to meet the sealing requirements of the folding display device during reciprocating folding, thereby achieving the function of preventing sand and dust.

[0091] The figure shows an embodiment with two cylindrical rollers 33. In other alternative embodiments, there may be multiple cylindrical rollers 33, such as four, six, or eight, the specific number of which can be selected by those skilled in the art according to the specific implementation.

[0092] In an alternative embodiment, the cylindrical roller 33 is interference-fitted with the middle frame 1 and the hinge cover plate 2.

[0093] In one specific embodiment, the interior of the cylindrical roller 33 can be made of metal, and the exterior of the metal is wrapped with silicone material. The cylindrical roller 33 is in close contact with the middle frame 1 and the hinge cover plate 2 through the outer silicone. The slight deformation of the outer silicone achieves the interference fit between the cylindrical roller 33 and the middle frame 1 and the hinge cover plate 2, thereby achieving the purpose of preventing sand and dust.

[0094] In one optional embodiment, the diameter of the cylindrical roller 33 needs to be set according to the design gap between the middle frame 1 and the hinge cover plate 2, wherein the diameter of the cylindrical roller 33 may optionally be in the range of 0.1 to 0.9 mm. Optionally, the diameter of the cylindrical roller 33 is 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm or 0.9 mm.

[0095] In one specific embodiment, the diameter of the cylindrical roller 33 is equal to the clearance between the hinge cover plate 2 and the middle frame 1 plus the depth of the groove 11 in the middle frame.

[0096] The difference between the thickness of the hinge cover plate 2 / the corresponding thickness of the middle frame 1 and the depth of the middle frame groove 11 is 0.2–0.4 mm. That is, after the middle frame groove 11 is provided, the remaining thickness of the middle frame 1 is 0.2–0.4 mm. Optionally, the remaining thickness of the middle frame 1 can be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm. The difference between the width of the middle frame groove 11 and the diameter of the cylindrical roller 33 is 0.04–0.1 mm.

[0097] Since the interference fit is achieved through the slight deformation of the external silicone, groove gaps of 0.02 to 0.05 mm are reserved on both sides of the cylindrical roller 33 to accommodate the slight deformation of the external silicone.

[0098] Optionally, the difference between the width of the groove 11 in the middle frame and the diameter of the cylindrical roller 33 can be 0.04mm, 0.05mm, 0.06mm, 0.08mm or 1mm.

[0099] In other alternative embodiments, the cylindrical roller 33 may be provided with a coaxial central shaft (not shown in the figure) at its center. The cylindrical roller 33 is fixedly connected to the hinge cover plate 2 through the end of the coaxial central shaft to further improve the stability of the connection between the cylindrical roller 33 and the hinge cover plate 2 and prevent unnecessary shaking of the cylindrical roller 33.

[0100] like Figure 14 and Figure 15As shown, in other alternative embodiments, auxiliary cylindrical rollers 4 can be respectively provided on the inner side of the hinge cover plate 2. The auxiliary cylindrical rollers 4 are also arranged along the folding axis of the folding display device. The auxiliary cylindrical rollers 4 are tightly fitted with the middle frame 1 and the hinge cover plate 2 respectively, which can further increase the dustproof effect.

[0101] Specifically, the number of auxiliary cylindrical rollers 4 can be selected according to the actual situation.

[0102] In a specific implementation, the auxiliary cylindrical roller 4 can adopt the same structure as the cylindrical roller 33, that is, the inside is formed of metal material, and the outside of the metal material is wrapped with silicone material to achieve an interference fit with the middle frame 1 and the hinge cover plate 2.

[0103] In an alternative embodiment, the cylindrical roller 33 is arranged along the folding axis of the folding display device, and the two ends of the cylindrical roller 33 are preferably aligned with the edges of the middle frame 1 or the hinge cover plate 2.

[0104] Example 6

[0105] This embodiment is an improvement based on embodiment 5, such as... Figure 16 and Figure 17 As shown, an elastic element 5 is provided between the cylindrical roller 33 and the middle frame 1, so that the cylindrical roller 33 and the hinge cover plate 2 are always tightly engaged under the action of the elastic element 5, regardless of whether the folded display device is in the folded or unfolded state, so as to reduce the risk of sand and dust entering the hinge and the interior of the display module.

[0106] In a specific embodiment, the elastic element 5 is preferably a spring or other elastic mechanism.

[0107] like Figure 16 As shown, in a specific embodiment, the elastic element 5 is preferably disposed outside the groove 11 of the middle frame and contacts the bottom of the cylindrical roller 33.

[0108] Among them, such as Figure 16 As shown, after setting the elastic element 5, the thickness b3 at the thinnest point of the middle frame 1 (i.e., the remaining thickness of the middle frame 1 after setting the elastic element 5) should not be less than 0.2mm. For example, b3 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm or 0.4mm.

[0109] The distance 'a' between the sidewall of the recess 11 and the edge of the middle frame should be no less than 0.2 mm. For example, 'a' can be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm to ensure the rigidity of the folding display device.

[0110] In this embodiment, since an elastic element 5 is provided between the cylindrical roller and the middle frame 1, the cylindrical roller 33 is preferably made of metal, such as stainless steel, copper alloy, or aluminum alloy. When the cylindrical roller 33 made of metal is pushed out by the elastic element 5, it can always maintain a tight fit with the hinge cover plate.

[0111] In other alternative embodiments, auxiliary cylindrical rollers 64, arranged along the folding axis of the folding display device, can also be provided on the inner side of the hinge cover 2 to further enhance the dustproof effect. The number of auxiliary cylindrical rollers 64 can also be selected according to the specific implementation.

[0112] Example 7

[0113] The present invention also provides a foldable screen mobile phone, including the foldable display device described in any of the above embodiments. Therefore, the foldable screen mobile phone of the present invention also possesses the beneficial effects of the foldable display device described in the above embodiments.

[0114] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," and similar words used in this invention, mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. In the description of this invention, the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, the relative positional relationship may also change accordingly, and therefore should not be construed as a limitation of the invention.

[0115] Therefore, those skilled in the art should recognize that although the present invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A foldable display device comprising a folding hinge, and a middle frame and a hinge cover plate connected by the folding hinge, characterized in that, A dustproof filler is provided between the middle frame and the hinge cover plate. The dustproof filler is tightly combined with the middle frame and the hinge cover plate. The dustproof filler is a winding and unwinding mechanism provided between the middle frame and the hinge cover plate. The winding and unwinding mechanism is formed by winding a high-strength ultra-thin metal material from the middle to the ends to form a central scroll. The central scroll is located in the middle of the hinge cover plate along the folding axis of the folding display device. The two ends of the winding and unwinding mechanism extend outward and are respectively connected to the inner side of the middle frame. A dustproof film is drawn into the winding and unwinding mechanism and the dustproof film is kept in a taut state, so that the dustproof film is pulled out when the folding display device is folded and drawn in when it is unfolded. 2.The foldable display apparatus of claim 1, wherein, The thickness of the dustproof filler is 15~30μm.

3. The folding display device according to claim 2, characterized in that, The two ends of the dustproof filler are connected to the middle frame and the hinge cover plate respectively by bonding, spot welding or riveting.

4. The folding display device according to claim 1, characterized in that, The hinge cover plate has a cover plate groove extending along the folding axis of the folding display device in the middle, and the middle roller of the winding and unwinding mechanism is disposed in the cover plate groove.

5. The folding display device according to claim 1, characterized in that, The two ends of the winding and unwinding mechanism are connected to the middle frame by bonding, spot welding or riveting.

6. The folding display device according to claim 4, characterized in that, The two winding and unwinding mechanisms are disposed in one or two cover plate grooves. When the two winding and unwinding mechanisms are disposed in one cover plate groove, the gap between the two winding and unwinding mechanisms is not less than 0.2 mm. When the two winding and unwinding mechanisms are disposed in two cover plate grooves, the two cover plate grooves are symmetrically placed on the left and right sides relative to the hinge cover plate, and the gap between the two cover plate grooves is not less than 0.3 mm.

7. The folding display device according to claim 1, characterized in that, An intermediate bearing is provided at the center of the winding and unwinding mechanism, and the central roll is wound around the intermediate bearing. The end of the intermediate bearing is fixedly connected to the hinge cover plate.

8. A foldable screen phone, characterized in that, Includes the folding display device according to any one of claims 1-7.

Images