Borderless display device and mobile terminal

Abstract

An embodiment of the present invention discloses a borderless display device and a mobile terminal, comprising a middle frame and a display module, wherein the middle frame comprises a side wall portion and a bottom wall portion; the display module comprises a stacked cover plate, a display layer and a support layer; the cover plate comprises a display area and a non-display area located at the four edges of the display area, wherein the non-display area located at two opposite sides of the bending area is fixed by a first fixing adhesive layer and the bottom wall portion, and is connected to the side wall portion without a gap; the display layer and the support layer are correspondingly arranged in the display area, the support layer comprises a connecting area, an adjustment area located at two opposite sides of the connecting area in a first direction, and a fixing area located on a side of the adjustment area away from the connecting area, the second fixing adhesive layer in the fixing area is fixed by the bottom wall portion, and the adjustment area can be extended and stretched; the display layer is fixed by the first optical adhesive layer and the display area, the projections of the display layer and the support layer on the horizontal plane overlap in the flattened state, and the display layer is fixed by the second optical adhesive layer and the connecting area.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly to a borderless display device and a mobile terminal. Background Art

[0002] With the development of display technology, the application fields of display devices have become very broad, and people's requirements for the various performance of display screens have gradually increased. Flexible displays have the characteristics of bendability and rollability. These features can be used to roll or fold the display screen, making it more convenient for people to carry and use display devices.

[0003] When assembling the entire flexible screen, it is generally necessary to fix the edges of the flexible display module by means of the outer frame 101, the frame glue 102, the dustproof glue 103 and other structures (such as Figure 1 However, when the flexible display screen is folded inward, the stacking structure of the flexible display module may be dislocated (as shown in FIG. Figure 2 To prevent collision or interference between the cover plate and the outer frame 101 of the flexible display module, a safety gap is generally reserved. The design of the safety gap and the presence of the outer frame 101 increase the weight and volume of the display, which does not meet the current requirements for lightweighting and miniaturization. Furthermore, the presence of the safety gap increases the black border area of ​​the flexible display, resulting in a reduction in the display area, affecting the user experience and the aesthetics of the display. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide a borderless display device.

[0005] Another object of the present invention is to provide a mobile terminal including the above-mentioned borderless display device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, there is provided a borderless display device, comprising:

[0008] A middle frame and a display module, wherein the middle frame includes side walls and a bottom wall, is arranged along the sides of the display module, and surrounds the display module;

[0009] The display module includes a cover plate, a display layer, and a support layer that are stacked together. The display module has a bending region, and the midline of the bending region in the first direction is the bending midline of the display device.

[0010] The cover plate includes a display area and non-display areas located around the edges of the display area. The non-display areas located on two opposite sides of the bending area in the first direction are fixed to the bottom wall portion by a first fixing adhesive layer and are connected to the side wall portion without a gap.

[0011] The display layer and the support layer are correspondingly arranged in the display area of ​​the cover plate, and are located on a side of the cover plate close to the bottom wall. The support layer includes a connection area, adjustment areas located on two opposite sides of the connection area in a first direction, and a fixing area located on a side of the adjustment area away from the connection area. The fixing area is fixed to the bottom wall of the middle frame by a second fixing adhesive layer. The adjustment area can extend and lengthen as the unfolded state transitions to the bent state.

[0012] The display layer is fixed to the display area of ​​the cover plate by a first optical adhesive layer. In a flattened state, the projections of the display layer and the support layer on a horizontal plane overlap. The portion of the display layer corresponding to the connection area is fixed to the connection area by a second optical adhesive layer.

[0013] In addition, an optional solution is that the adjustment area is provided with a plurality of through holes penetrating the upper and lower surfaces of the support layer, and the through holes are long strips or elliptical and are provided in a staggered array in the adjustment area.

[0014] In addition, an optional solution is that the connection area is fixed by combining a first flexible adhesive layer and the bottom wall of the middle frame, and the thickness of the first flexible adhesive layer is equal to the thickness of the second fixing adhesive layer.

[0015] In addition, an optional solution is that a first filling layer is disposed between the connection area and the bottom wall of the middle frame, and the thickness of the first filling layer is equal to the thickness of the second fixing adhesive layer;

[0016] The first filling layer is fixed to the bottom wall portion and abuts against a surface of the connection area close to the bottom wall portion.

[0017] In addition, an optional solution is that a second filling layer is included between the adjustment area and the bottom wall portion, and the thickness of the second filling layer is equal to the thickness of the second fixing adhesive layer;

[0018] The second filling layer is fixed to the bottom wall portion and abuts against a surface of the adjustment area close to the bottom wall portion.

[0019] In addition, an optional solution is that a third filling layer is disposed between the support layer and the portion of the display layer corresponding to the fixing area and the adjustment area of ​​the support layer, and the thickness of the third filling layer is equal to the thickness of the second optical adhesive layer;

[0020] The third filling layer is combined and fixed with the display layer and abuts against the supporting layer.

[0021] In addition, an optional solution is that the first fixing adhesive layer and the second fixing adhesive layer include a gap in the first direction, and the width of the gap is 1-2 mm.

[0022] In addition, an optional solution is that the middle frame includes a first middle frame located at two opposite sides of the bending area in the first direction, and two second middle frames located between the two first middle frames, and the first middle frame and the second middle frame are spliced ​​together to form an installation space, surrounding the display module;

[0023] The cover plate is fixed to the bottom wall of the first middle frame in a non-display area corresponding to the first middle frame via a first fixing adhesive layer, and the upper end surface of the cover plate is flush with the upper end surface of the side wall of the first middle frame;

[0024] The height of the side wall portion of the second middle frame is smaller than the height of the side wall portion of the first middle frame. The cover plate extends above the side wall portion of the second middle frame corresponding to the non-display area of ​​the second middle frame and is fixed to the upper end surface of the side wall portion of the second middle frame via the second flexible adhesive layer. The upper end surface of the cover plate is parallel to the horizontal plane.

[0025] In addition, an optional solution is that the first fixed adhesive layer is located between the bottom wall portion of the first middle frame and the cover plate, the upper and lower side surfaces of the first fixed adhesive layer are respectively combined and fixed to the non-display area portion of the first middle frame and the bottom wall portion of the first middle frame corresponding to the cover plate, and a side surface of the first fixed adhesive layer close to the side wall portion of the first middle frame is combined and fixed to the side wall portion, and the edge of the cover plate abuts against the side wall portion of the first middle frame.

[0026] In addition, an optional solution is that the first fixing adhesive layer is located between the side wall portion of the first middle frame and the cover plate, is fixedly coupled to the side wall portion of the first middle frame, and the upper end surface of the first fixing adhesive layer is flush with the upper end surface of the first middle frame;

[0027] The lower end surface of the first fixed adhesive layer is fixed to the bottom wall of the first middle frame. The side of the first fixed adhesive layer close to the cover plate includes a step portion that supports the edge of the cover plate. The edge of the cover plate corresponding to the non-display area of ​​the first middle frame is fixed to the step portion.

[0028] According to another aspect of the present invention, a mobile terminal is provided, including a frameless display device.

[0029] The beneficial effects of the present invention are as follows:

[0030] In response to the technical problems existing in the prior art, a borderless display device and mobile terminal are provided, in which the folding center is set on the upper end surface of the cover plate, providing more space for the bending of the display module. By rigidly connecting the non-display area of ​​the cover plate on the folding side with the middle frame without gaps, the outer frame components in conventional designs are eliminated, achieving a borderless appearance, reducing the black border area, increasing the display area, and having both waterproof and dustproof properties; by designing the support layer in a segmented manner, a ductile adjustment area is designed, and the fixed area is rigidly connected to the middle frame to fix the relative position of the two. When the display device is bent, the displacement of the cover plate is absorbed layer by layer by the display layer and the support layer. Finally, the displacement generated by the elongation and folding of the adjustment area avoids the collision of the cover plate with the middle frame during the bending process, thereby improving the product yield and having the advantages of reducing the black border and having a beautiful borderless appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Figure 1 A schematic diagram showing the structure of the connection between the display module and the middle frame in a conventional design.

[0033] Figure 2 A schematic diagram showing the shifting of the display module stacking structure when the display device is in a bent state in a conventional design is shown.

[0034] Figure 3 A schematic diagram showing the appearance of a borderless display device provided by an embodiment of the present invention is shown.

[0035] Figure 4 A schematic structural diagram of the connection between the display module and the middle frame provided by an embodiment of the present invention is shown.

[0036] Figure 5 A schematic diagram of a partial structure showing a display module provided by an embodiment of the present invention installed on a middle frame is shown.

[0037] Figure 6 A schematic diagram of a partial structure showing a display module provided by another embodiment of the present invention installed on a middle frame is shown.

[0038] Figure 7 FIG. 1 is a schematic diagram showing the movement of a display module when the display device provided by an embodiment of the present invention is bent.

[0039] Figure 8 Show Figure 3 Schematic cross-section of AA.

[0040] Figure 9 A schematic diagram of a partial structure of a display device provided by an embodiment of the present invention is shown.

[0041] Figure 10 A schematic diagram showing a partial structure of a display device provided by another embodiment of the present invention is shown.

[0042] Figure 11 A top view of the connection between the support plate and the second middle frame provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0044] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0045] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0046] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0047] With the development of display technology, the application field of display devices is very wide, and people's requirements for the performance of display screens are gradually increasing. Flexible display screens have the characteristics of being bendable and rollable. By utilizing these characteristics, the display screen can be rolled or folded, thereby bringing convenience to people in carrying and using the display device. When assembling the entire flexible screen, it is generally necessary to fix the edges of the flexible display module through structures such as the outer frame 101, frame glue 102, and dustproof glue 103 (such as the outer frame 101, frame glue 102, and dustproof glue 103). Figure 1 However, when the flexible display screen is folded inward, the stacking structure of the flexible display module may be dislocated (as shown in FIG. Figure 2To prevent collision or interference between the cover plate and the outer frame 101 of the flexible display module, a safety gap is generally reserved. The design of the safety gap and the presence of the outer frame 101 increase the weight and volume of the display, which does not meet the current requirements for lightweighting and miniaturization. Furthermore, the presence of the safety gap increases the black border area of ​​the flexible display, resulting in a reduction in the display area, affecting the user experience and the aesthetics of the display.

[0048] To address the shortcomings of the prior art, embodiments of the present invention provide a borderless display device that can be in a flattened state or a bent state. As shown in FIG3-10 , the borderless display device includes a middle frame 7 and a display module. The middle frame includes side walls and a bottom wall. The middle frame is arranged along the sides of the display module, surrounding the display module.

[0049] The display module includes a cover plate 2, a display layer 3 and a support layer 4 which are stacked. Figure 3 As shown, the display module has a bending area 201, which allows the display module to be bent and unfolded here, thereby realizing the switching between the bent state and the flat state of the display device. The center line of the bending area 201 in the first direction is the bending center line of the display device ( Figure 3 It is understood that Figure 3 The X-axis direction in the figure is the first direction, and the first direction is the bending direction.

[0050] The cover plate 2 includes a display area 21 and non-display areas located around the edges of the display area 21. The non-display areas located on two opposite sides of the bending area 201 in the first direction are the first non-display areas 22, and the non-display areas located on two opposite sides of the bending area 201 in the second direction are the second non-display areas 23. It can be understood that the first direction is Figure 3 The X direction in the second direction is Figure 3 In the Y direction, the XY plane is parallel to the horizontal plane.

[0051] The first non-display area 22 is bonded and fixed to the bottom wall of the middle frame 7 via the first fixing adhesive layer 51 , and the edge of the first non-display area 22 away from the display area 21 is connected to the side wall of the middle frame without a gap.

[0052] The first fixing adhesive layer 51 is made of hard adhesive, which rigidly connects the cover plate 2 to the bottom wall of the middle frame. A rigid connection means that when the connection is subjected to external forces from any direction, the connected parts can maintain their original relative positions and withstand and resist these external forces as a whole. Hard adhesive offers advantages such as high strength, high stability, and good chemical resistance. Connecting the cover plate 2 to the bottom wall of the middle frame with hard adhesive ensures that the cover plate 2 does not move when the display device is bent, thereby preventing collision and interference between the cover plate 2 and the middle frame without providing a safety gap.

[0053] The display layer 3 and support layer 4 are arranged correspondingly in the display area 21 of the cover plate 2, located on the side of the cover plate 2 near the bottom wall of the middle frame. The support layer 4 is used to support the display layer 3 and includes a connection area 41, an adjustment area 42, and a fixing area 43. The connection area 41 extends along the first direction and is the main portion of the support layer 4, adhesively fixed to the display layer 3. The adjustment area 42 is located on two opposite sides of the connection area 41 in the first direction. The fixing area 43 is located on the side of the adjustment area 42 away from the connection area 41. The fixing area 43 is fixed to the bottom wall of the middle frame via a second fixing adhesive layer 52.

[0054] The second fixing adhesive layer 52 is made of hard adhesive, which rigidly connects the fixing area 43 to the bottom wall of the middle frame. A rigid connection means that when the connection is subjected to external forces from any direction, the connected parts can maintain their original relative positions and withstand and resist these external forces as a whole. Hard adhesive offers advantages such as high strength, high stability, and good chemical resistance. By connecting the fixing area 43 to the bottom wall of the middle frame 7 with hard adhesive, the relative positions of the fixing area 43 and the middle frame 7 are ensured to remain unchanged when the display device is bent.

[0055] The adjustment area 42 has a certain degree of ductility. When the position of the fixed area 43 remains unchanged, the adjustment area 42 can gradually extend as the display device transitions from a flat state to a bent state, absorbing the displacement of the cover plate 2 during the folding process, and avoiding interference or collision between the cover plate 2 and the middle frame during the folding process, thereby causing defects.

[0056] The display layer 3 is positioned below the display area 21 of the cover plate 2 and is secured to the display area 21 of the cover plate 2 via a first optical adhesive layer 61. In the displayed and flattened state, the horizontal projections of the display layer 3 and the support layer 4 overlap. The portion of the display layer 3 corresponding to the connection area 41 of the support layer 4 is secured to the connection area 41 of the support layer 4 via a second optical adhesive layer 62. The adjustment area 42 and the fixing area 43 of the display layer 3 and the support layer 4 are disconnected, meaning no optical adhesive or other connecting material is provided. This ensures that the adjustment area 42 can freely expand when transitioning from the flattened state to the bent state, unrestricted by or affecting the display area 3. The retraction of the display area 3 and the expansion of the adjustment area 42 absorb any movement of the cover plate 2 during folding.

[0057] In one embodiment, the adjustment area 42 of the support layer 4 is provided with a plurality of through holes (not shown) penetrating the upper and lower surfaces of the support layer 4, and the through holes are in the shape of a long strip or an ellipse. Specifically, the staggered arrangement of the plurality of through holes in any two adjacent columns or rows can increase the deformation capacity of the adjustment area 42. Since the positions of the cover plate 2 and the fixed area 43 are fixed, when the display device is bent, the adjustment area 42 can be stretched to a certain extent along with the bending degree of the display device to offset the displacement of the cover plate 2. Since the staggered through holes are affected by the material strength of the adjacent unopened parts, after the bending state is changed to the flattened state, the stretched part in the middle of the through hole can quickly return to its original state, so that the adjustment area 42 has a good ability to recover deformation. The staggered arrangement of the through holes saves the stress distribution received by the adjustment area 42 during stretching, avoiding the concentration of stress in a certain place. Furthermore, the through holes are evenly spaced or gradually distributed in the adjustment area 42.

[0058] In a specific embodiment, the middle frame 7 includes two first middle frames 71 located on two opposite sides of the bending region 201 in the first direction, and two second middle frames 72 located between the two first middle frames 71. The first middle frames 71 and the second middle frames 72 are spliced ​​together to form an installation space, surrounding the display module.

[0059] The non-display area of ​​the cover plate 2 corresponding to the first middle frame 71 is the first non-display area 22, and the non-display area corresponding to the second middle frame 72 is the second non-display area 23. Figure 5 As shown, the first non-display area 22 is fixed by the first fixed adhesive layer 51 and the bottom wall portion 711 of the first middle frame 71, and the upper end surface of the cover plate 2 is flush with the upper end surface of the side wall portion 712 of the first middle frame 71, and there is a gap-free connection between the cover plate 2 and the side wall portion 712 of the first middle frame 71, which can achieve dust-proof and waterproof effects.

[0060] The height of the side wall portion 722 of the second middle frame 72 is less than the height of the side wall portion 712 of the first middle frame 71. Figure 8As shown, the second non-display area 23 of the cover plate 2 extends to above the side wall portion 722 of the second middle frame 72, covering the upper end surface of the side wall portion 722 of the second middle frame 72, and is fixed to the upper end surface of the side wall portion 722 of the second middle frame 72 by the second flexible adhesive layer 82, and the upper end surface of the cover plate 2 is parallel to the horizontal plane, ensuring the flatness of the display screen, which can be dust-proof and waterproof, and can also realize the borderless design of the appearance of the display device, reduce the black edge range, and increase the display area.

[0061] The second flexible adhesive layer 82 can bend with the display device when subjected to external forces, while maintaining sufficient adhesion and stability to ensure that the display module does not break or separate during bending. Specifically, the second flexible adhesive layer 82 can be made of elastic adhesive, silicone, or polyimide (PI)-based adhesive.

[0062] In one embodiment, Figure 5 As shown, the first fixed adhesive layer 51 is located between the bottom wall portion 711 of the first middle frame 71 and the cover plate 2, and the upper and lower side surfaces of the first fixed adhesive layer 51 are respectively combined and fixed with the first non-display area 22 of the cover plate 2 and the bottom wall portion 711 of the first middle frame 71, and the side surface of the first fixed adhesive layer 51 close to the side wall portion 712 of the first middle frame 71 is combined and fixed with the side wall portion 712, and the edge of the first non-display area 22 of the cover plate 2 is in contact with the side wall portion 712 of the first middle frame 71, thereby achieving the fixation of the relative position between the first non-display area 22 and the first middle frame 71, and the gap-free connection between the cover plate 2 and the first middle frame 71.

[0063] In another embodiment, Figure 6 As shown, the first fixed adhesive layer 51 is located between the side wall portion 712 of the first middle frame 71 and the cover plate 2, and is fixed to the side wall portion 712 of the first middle frame 71. The upper end surface of the first fixed adhesive layer 51 is flush with the upper end surface of the first middle frame 71, and the lower end surface of the first fixed adhesive layer 1 is fixed to the bottom wall portion 711 of the first middle frame 71. The side of the first fixed adhesive layer 51 close to the cover plate 2 includes a recessed step portion 510. The step portion 510 is used to support the edge of the first non-display area 22. The side and lower end surface of the first non-display area 22 are fixed to the step portion 510, achieving a gap-free connection between the first non-display area 22 and the side wall portion 712 of the first middle frame 71.

[0064] Both of the above-mentioned embodiments can achieve the fixation of the relative position between the first non-display area 22 and the first middle frame 71 through the first fixed adhesive layer 51, as well as the gap-free connection between the cover plate 2 and the first middle frame 71 through the first fixed adhesive layer 51, thereby achieving a waterproof and dustproof effect. The relative position of the first non-display area 22 and the first middle frame 71 is fixed, and the cover plate 2 will not be displaced when the display device is bent. When the display device is bent, the folding center reference is located on the upper end surface of the cover plate 2, giving the display module more space in the bending area 201. Due to the rigid fixation of the first non-display area 22, during the bending process of the display device, the displacement generated by the cover plate 2 is absorbed layer by layer by the display layer 3 and the support layer 4, and finally the displacement generated by the folding is absorbed by the elongation of the adjustment area 42.

[0065] Although the structure in which the first fixed adhesive layer 51 is arranged between the bottom wall portion 711 of the first middle frame 71 and the cover plate 2 can further reduce the area of ​​the black edge, the waterproof and dustproof effect may be slightly worse than the structure in which the first fixed adhesive layer 51 is arranged between the side wall portion 712 of the first middle frame 71 and the cover plate 2; although the waterproof and dustproof effect of the structure in which the first fixed adhesive layer 51 is arranged between the side wall portion 712 of the first middle frame 71 and the cover plate 2 is improved, the area of ​​the black edge will be slightly larger than the structure in which the first fixed adhesive layer 51 is arranged between the bottom wall portion 711 of the first middle frame 71 and the cover plate 2. In actual production, those skilled in the art can make a choice according to actual needs, and the embodiments of the present invention do not impose specific restrictions.

[0066] In a specific embodiment, Figure 4-6 As shown, to bridge the step between the display module and the middle frame 7, a first flexible adhesive layer 81 is provided between the connection area 41 and the bottom wall of the middle frame, providing support for the display module. The connection area 41 is fixed by the first flexible adhesive layer 81 and the bottom wall of the middle frame. The thickness of the first flexible adhesive layer 81 is equal to that of the second fixing adhesive layer 52. The second fixing adhesive layer 52 and the first flexible adhesive layer 81 provide support for the display module, preventing it from collapsing or deforming.

[0067] The first flexible adhesive layer 81 is a flexible adhesive with a certain degree of deformation and good flexibility. It can deform synchronously with the extension of the adjustment area 42 to ensure that the adjustment area 42 can adjust with the bending of the display device, thereby absorbing the displacement caused by folding, preventing interference or collision between the cover plate 2 and the middle frame, which could cause defects, and improving product yield. Specifically, the first flexible adhesive layer 81 can be a polyimide (PI)-based adhesive, etc.

[0068] Further, such as Figure 9As shown, a second filling layer 92 is disposed between the adjustment area 42 and the bottom wall of the middle frame 7. The thickness of the second filling layer 92 is equal to the thickness of the second fixing adhesive layer 52, and is used to provide support for the adjustment area 42 of the support layer 4, thereby preventing the edge of the display module from being dented due to insufficient bottom support when pressed. The second filling layer 92 is made of PET (Polyethylene terephthalate) or TPU (Thermoplastic polyurethanes), has good impact resistance and shock absorption properties, and can provide good support for the adjustment area 42. The second filling layer 92 is fixed to the bottom wall 711 of the first middle frame 71, and abuts against the side surface of the adjustment area 42 close to the bottom wall, but is not fixed and does not extend with the extension of the adjustment area 42, so that the adjustment area 42 can extend freely without being affected by the second filling layer 92.

[0069] In another embodiment, Figure 10 As shown, to bridge the step between the display module and the midframe, a first flexible filling layer 91 is positioned between the connection area 41 and the bottom wall of the midframe, providing support for the display module. The first filling layer 91 is fixed to the bottom wall of the midframe and abuts against the surface of the connection area 41 near the bottom wall, but is not fixedly connected to it to avoid affecting the free extension of the adjustment area 42. The thickness of the first filling layer 91 is equal to that of the second fixed adhesive layer 52. The second fixed adhesive layer 52 and the first filling layer 91 provide support for the display module, preventing it from collapsing and deforming due to insufficient bottom support when pressed by external forces.

[0070] The first filling layer 91 is made of PET (Polyethylene terephthalate) or TPU (Thermoplastic polyurethanes) material, has good impact resistance and shock absorption properties, and can provide good support for the connecting area 41 .

[0071] Furthermore, a second filling layer 92 is disposed between the adjustment area 42 and the bottom wall of the middle frame. The thickness of this second filling layer 92 is equal to that of the second fixing adhesive layer 52. This layer provides support for the adjustment area 42 of the support layer 4, thereby preventing the edge of the display module from denting due to insufficient bottom support when pressed. The second filling layer 92 is made of PET (Polyethylene terephthalate) or TPU (Thermoplastic polyurethane), which has excellent impact resistance and shock absorption properties, providing excellent support for the adjustment area 42.

[0072] The second filling layer 92 is fixed to the bottom wall portion 711 of the first middle frame 71 and abuts against the surface of the adjustment area 42 near the bottom wall portion, but is not fixed and does not extend as the adjustment area 42 extends, allowing the adjustment area 42 to extend freely without being affected by the second filling layer 92. It should be noted that the first filling layer 91 and the second filling layer 92 can be an integral structure or can be provided separately; when the first filling layer 91 and the second filling layer 92 are provided separately, the materials of the first filling layer 91 and the second filling layer 92 can be the same or different, and can be selected according to actual conditions, and this embodiment of the present invention does not impose specific limitations on this.

[0073] In a specific embodiment, since the portion of the display layer 3 corresponding to the fixing area 43 and the adjustment area 42 of the support layer 4 is disconnected from the support layer 4, there is no connection and insufficient support. Therefore, when the display device is subjected to external force, the corresponding portion may sag, causing defects. Figure 5 As shown, a third filling layer 93 is configured between the display layer 3 corresponding to the fixing area 43 and the adjustment area 42 of the support layer 4 and the support layer 4. The thickness of the third filling layer 93 is equal to the thickness of the second optical adhesive layer 62, and can provide effective support for the display layer 3 corresponding to the fixing area 43 and the adjustment area 42 of the support layer 4.

[0074] The third filling layer 93 is bonded and fixed to the surface of the display layer 3 near the support layer 4, abutting against the support layer 4 but not fixed thereto, and thus does not affect the free extension of the adjustment area 42. Because the portion of the display layer 3 corresponding to the connection area 41 of the support layer 4 is bonded and fixed to the support layer 4 via the second optical adhesive layer 62, when the display device is bent, the movement of the display layer 3 will cause the connection area 41 to move. However, because the fixed area 43 and the midframe are rigidly connected and their relative positions are fixed, the movement of the display layer 3 will cause the adjustment area 42 to extend. Ultimately, the extension of the adjustment area 42 absorbs the movement of the display module caused by the bending, preventing interference and collision between the cover plate 2 and the midframe, thereby improving product yield.

[0075] The third filling layer 93 is made of PET (Polyethylene terephthalate) or TPU (Thermoplastic polyurethanes), has good impact resistance and shock absorption properties, and can provide good support for the portion of the display layer 3 corresponding to the adjustment area 42 and the fixing area 43 of the support layer 4.

[0076] In a specific embodiment, a gap is formed between the first fixing adhesive layer 51 and the second fixing adhesive layer 52 in the first direction. This gap is intended to prevent adhesion between the first optical adhesive layer 61 and the first fixing adhesive layer 51, which could affect product yield. Preferably, the width d of the gap is 1-2 mm.

[0077] In one embodiment, the adjustment area 42 of the support layer 4 and the portion of the support layer 4 corresponding to the bending area 201 are not connected to the side wall portion 722 of the second middle frame 72. Figure 11 As shown, a non-sticky layer 90 is disposed between the adjustment area 42 of the support layer 4 and the side wall portion 722 of the second middle frame 72, as well as between the portion of the support layer 4 corresponding to the bending area 201 and the side wall portion 722 of the second middle frame 72. This prevents the support layer 4 from shifting and prevents the adjustment area 42 of the support layer 4, the portion of the support layer 4 corresponding to the bending area 201, and the second middle frame 72 from becoming fixed in position, thereby affecting the bending effect. Furthermore, the remaining portion of the support layer 4 near the side wall portion 722 of the second middle frame 72 is connected and fixed to the side wall portion 722 of the second middle frame 72 via a third flexible adhesive layer 73, thereby achieving installation of the support layer 4.

[0078] Another embodiment of the present invention provides a mobile terminal, including the borderless display device of the above embodiment, and further including components such as a housing, a processor, a memory, and a battery. Specifically, the mobile terminal can be a foldable screen mobile phone, etc.

[0079] The embodiment of the present invention provides a borderless display device and mobile terminal, in which the folding center is set on the upper end surface of the cover plate, providing more space for the bending of the display module. By rigidly connecting the non-display area of ​​the cover plate on the folding side with the middle frame without gaps, the outer frame components in the conventional design are eliminated, achieving a borderless appearance, reducing the black border area, increasing the display area, and having both waterproof and dustproof properties; by designing the support layer in a segmented manner, designing an adjustment area with ductility, and rigidly connecting the fixed area with the middle frame to fix the relative position of the two, when the display device is bent, the displacement of the cover plate is absorbed layer by layer by the display layer and the support layer, and finally the displacement generated by the elongation and folding of the adjustment area avoids the collision of the cover plate with the middle frame during the bending process, thereby improving the yield of the product, and having the advantages of reducing the black border and having a beautiful and borderless appearance.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A borderless display device having a flattened state and a bent state, characterized in that: The display module comprises a middle frame and a display module, wherein the middle frame comprises a side wall portion and a bottom wall portion, and is arranged along the side of the display module to surround the display module; The display module includes a cover plate, a display layer, and a support layer that are stacked together. The display module has a bending region, and the midline of the bending region in the first direction is the bending midline of the display device. The cover plate includes a display area and non-display areas located around the edges of the display area. The non-display areas located on two opposite sides of the bending area in the first direction are fixed to the bottom wall portion by a first fixing adhesive layer and are connected to the side wall portion without a gap. The display layer and the support layer are correspondingly arranged in the display area of ​​the cover plate, and are located on a side of the cover plate close to the bottom wall. The support layer includes a connection area, adjustment areas located on two opposite sides of the connection area in a first direction, and a fixing area located on a side of the adjustment area away from the connection area. The fixing area is fixed to the bottom wall of the middle frame by a second fixing adhesive layer. The adjustment area can extend and lengthen as the unfolded state transitions to the bent state. The display layer is fixed to the display area of ​​the cover plate by a first optical adhesive layer. In a flattened state, the projections of the display layer and the support layer on a horizontal plane overlap. The portion of the display layer corresponding to the connection area is fixed to the connection area by a second optical adhesive layer.

2. The borderless display device according to claim 1, wherein: The adjustment area is provided with a plurality of through holes penetrating the upper and lower surfaces of the support layer. The through holes are in the shape of long strips or ellipses and are arranged in a staggered array in the adjustment area.

3. The borderless display device according to claim 1, wherein: The connection area is fixed by combining a first flexible adhesive layer and the bottom wall of the middle frame, and the thickness of the first flexible adhesive layer is equal to the thickness of the second fixing adhesive layer.

4. The borderless display device according to claim 1, wherein: A first filling layer is disposed between the connection area and the bottom wall of the middle frame, and the thickness of the first filling layer is equal to the thickness of the second fixing adhesive layer; The first filling layer is fixed to the bottom wall portion and abuts against a surface of the connection area close to the bottom wall portion.

5. The frameless display device according to claim 3 or 4, wherein: A second filling layer is included between the adjustment area and the bottom wall portion, and the thickness of the second filling layer is equal to the thickness of the second fixing adhesive layer; The second filling layer is fixed to the bottom wall portion and abuts against a surface of the adjustment area close to the bottom wall portion.

6. The borderless display device according to claim 1, wherein: A third filling layer is disposed between the support layer and the portion of the display layer corresponding to the fixing area and the adjustment area of ​​the support layer, wherein the thickness of the third filling layer is equal to the thickness of the second optical adhesive layer; The third filling layer is combined and fixed with the display layer and abuts against the supporting layer.

7. The borderless display device according to claim 1, wherein: The first fixing adhesive layer and the second fixing adhesive layer include a gap in the first direction, and the width of the gap is 1-2 mm.

8. The borderless display device according to claim 1, wherein: The middle frame includes a first middle frame located at two opposite sides of the bending area in the first direction, and two second middle frames located between the two first middle frames. The first middle frame and the second middle frame are spliced ​​together to form an installation space, surrounding the display module. The cover plate is fixed to the bottom wall of the first middle frame in a non-display area corresponding to the first middle frame via a first fixing adhesive layer, and the upper end surface of the cover plate is flush with the upper end surface of the side wall of the first middle frame; The height of the side wall portion of the second middle frame is smaller than the height of the side wall portion of the first middle frame. The cover plate extends above the side wall portion of the second middle frame corresponding to the non-display area of ​​the second middle frame and is fixed to the upper end surface of the side wall portion of the second middle frame via the second flexible adhesive layer. The upper end surface of the cover plate is parallel to the horizontal plane.

9. The borderless display device according to claim 8, wherein: The first fixing adhesive layer is located between the bottom wall of the first middle frame and the cover plate. The upper and lower side surfaces of the first fixing adhesive layer are respectively fixed to the non-display area of ​​the first middle frame and the bottom wall of the first middle frame corresponding to the cover plate. A side surface of the first fixing adhesive layer close to the side wall of the first middle frame is fixed to the side wall. The edge of the cover plate abuts against the side wall of the first middle frame.

10. The borderless display device according to claim 8, wherein: The first fixing adhesive layer is located between the side wall portion of the first middle frame and the cover plate, and is fixed to the side wall portion of the first middle frame. The upper end surface of the first fixing adhesive layer is flush with the upper end surface of the first middle frame. The lower end surface of the first fixed adhesive layer is fixed to the bottom wall of the first middle frame. The side of the first fixed adhesive layer close to the cover plate includes a step portion that supports the edge of the cover plate. The edge of the cover plate corresponding to the non-display area of ​​the first middle frame is fixed to the step portion.

11. A mobile terminal, characterized in that: The invention comprises a borderless display device as described in any one of claims 1 to 10.

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