Polarizing plate, folding module and display device

Abstract

The present invention discloses a polarizing plate, a folding module and a display device. A polarizing plate in a specific embodiment is used for a folding display module, comprising a filter layer, a polarizing layer and a protective layer stacked in sequence, wherein the protective layer comprises a protection zone and a release zone at positions corresponding to both sides of the bending axis of the folding module, and the release zone is used to release the stress on the polarizing plate in a bent state. The sound-generating device of this embodiment has the characteristics of wide assembly. In this embodiment, the stress on the polarizing plate during bending is fully released by the release zone, thereby reducing the risk of the polarizing plate breaking, and improving the bending performance and impact resistance on the basis of ensuring a small bending radius design.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to a polarizing plate, a folding module and a display device. Background Art

[0002] Folding display devices have the advantages of being bendable, rollable, taking up little space, and being easy to store and carry. Furthermore, the market has gradually increased requirements on the display performance, bending performance, impact resistance, and overall thickness of folding display devices. However, the folding display devices of the prior art still have problems such as poor display performance, poor bending performance, poor impact resistance, and large overall thickness. Summary of the invention

[0003] An object of the present invention is to provide a sound generating device and a display system to solve at least one of the problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A first aspect of the present invention provides a polarizing plate for a foldable display module, comprising a filter layer, a polarizing layer and a protective layer stacked in sequence, wherein:

[0006] The protective layer includes a protection area and a release area at both sides of the bending axis corresponding to the folding module, and the release area is used to release the stress on the polarizing plate in a bent state.

[0007] Furthermore, the release area extends along the axial direction of the bending axis.

[0008] Furthermore, the release area is provided with a plurality of openings arranged in an array.

[0009] Furthermore, the plurality of array-arranged openings are non-uniformly arranged in at least one direction.

[0010] Further, the distance between the release area and the bending axis is set to πR, where R is the bending radius of the folding module;

[0011] The width of the release area is set to 3-4 mm.

[0012] Furthermore, the material of the protection zone is different from the material of the release zone.

[0013] Furthermore, the polarizing plate further comprises: a first adhesive layer located on the side of the filter layer away from the polarizing layer and a second adhesive layer located on the protective layer, wherein the material of the second adhesive layer is the same as that of the release area.

[0014] A second aspect of the present invention provides a folding module, which includes: a bracket, a connecting layer, a back film, a display panel, a polarizing plate as provided in the first aspect of the present invention, and a cover plate stacked in sequence.

[0015] Furthermore, the connection layer includes: a base, a first adhesive layer connecting the base and the bracket, and a second adhesive layer connecting the base and the backing film, wherein a plurality of grooves are formed at an edge region of the second adhesive layer.

[0016] Furthermore, the material of the substrate is polyethylene terephthalate or polyimide.

[0017] Furthermore, the width of the edge region where the multiple grooves are formed is 25 mm to 30 mm; and the depth of the multiple grooves is 5 μm to 8 μm.

[0018] A third aspect of the present invention provides a display device, comprising the folding module provided by the second aspect of the present invention.

[0019] The beneficial effects of the present invention are as follows:

[0020] The embodiment of the present invention fully releases the stress on the polarizing plate when bending through the release area located in the protective layer, thereby reducing the risk of the polarizing plate breaking. On the basis of ensuring a small bending radius design, the bending performance and impact resistance are improved, and the embodiment has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] Figure 1 A schematic diagram showing the layer structure of a polarizing plate according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram showing the layer structure of a polarizing plate according to an embodiment of the present invention;

[0024] Figure 3 A top view showing a protective layer according to an embodiment of the present invention;

[0025] Figure 4a and Figure 4b Schematic diagrams of stress simulation under the bending state of the folding module are shown respectively;

[0026] Figure 5a to 5c Schematic diagrams of opening arrangements of different opening shapes in the release area are shown respectively;

[0027] Figure 6 A schematic diagram showing the layer structure of a folding module according to another embodiment of the present invention;

[0028] Figure 7A schematic diagram showing the layer structure of the connection layer of the folding module according to an embodiment of the present invention;

[0029] Figure 8 A schematic diagram showing a top view of the structure of a connection layer according to an embodiment of the present invention; DETAILED DESCRIPTION

[0030] The terms “on”, “formed on” and “disposed on” in the present invention may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0032] It should be noted that, in the description of the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] In the prior art, in order to save space in the entire machine, higher and higher requirements are placed on the bending performance of the folding module. For example, the bending radius is required to become smaller and smaller, and the inner bending radius develops from R4.5 to R1. For another example, the bending shape develops from a U-shaped structure to a teardrop-shaped structure. However, the folding module is prone to breakage.

[0034] Furthermore, the prior art reduces the thickness of the folding module and the overall displacement of the folding module, thereby achieving a small bending radius design. However, the problem that follows is that the impact resistance and reliability of the folding module of this structure are not high, and the folding module still has the problem of breaking.

[0035] In view of this, the inventors have proposed, after a large number of experiments and studies, that the main reason for the breakage of the folding module is that the polarizing plate in the folding module is prone to breakage, which leads to the breakage of the folding module and poor display. That is, as the thickness of the folding module continues to increase, the stress on the polarizing plate continues to increase, and finally causes cracks in the polarizing plate. Especially under high temperature conditions, the polarizing layer of the folding module shrinks and deforms, and the protective layer of the polarizing plate is subjected to tensile stress. Under the action of the bidirectional stress on the interface, it is very easy to cause the polarizing plate to break. Therefore, based on the above findings, the inventors propose a polarizing plate, a folding module, and a display device to solve one or more of the above problems.

[0036] One embodiment of the present invention provides a polarizing plate, such as Figure 1 As shown, the polarizing plate 1 comprises: a filter layer 11, a polarizing layer 12 and a protective layer 13 which are stacked in sequence, wherein:

[0037] The protection layer 13 includes a protection area 131 and a release area 132 at both sides of the bending axis corresponding to the folding module. The release area 132 is used to release the stress on the polarizing plate 1 in the bent state.

[0038] This embodiment simulates and analyzes each film layer of the polarizing plate, and finds that the polarizing plate is mostly broken at the protective layer 13, and the breakage of the protective layer 13 further causes the failure of the polarizing layer 12. The release area of ​​this embodiment can fully release the stress on the polarizing plate when bending, thereby reducing the risk of polarizing plate breakage, and improving the bending performance and impact resistance on the basis of ensuring a small bending radius design.

[0039] In this embodiment, the filter layer is used to filter light of different wavelengths. Figure 1 As shown, the filter layer 11 includes a first filter layer 111 and a second filter layer 112, wherein the first filter layer 111 can pass wavelengths of The second filter layer 112 can filter light of other wavelengths. The incident light is then polarized by the polarizing layer before being emitted.

[0040] In a specific example, the material of the polarizing layer can be polyvinyl alcohol (PVA for short) or cross-linked polyvinyl alcohol microspheres (PVA-Ms for short).

[0041] In an optional embodiment, the material of the protection zone 131 is different from the material of the release zone 132. In a specific example, the material of the protection zone 131 can be triacetyl cellulose (TAC) or acrylic (CAT), which has good abrasion resistance, scratch resistance, scratch resistance, and anti-reflection properties, and can effectively protect the polarizing layer. The material of the release zone 132 can be pressure-sensitive adhesive (PSA) or OC adhesive, which is resistant to high temperatures and water-proof. While ensuring support, it can also absorb more deformation when in a bent state, which can not only ensure the bending performance of the protective layer itself, but also effectively protect the polarizing layer.

[0042] In an optional embodiment, if Figure 2 As shown, the polarizing plate further includes: a first adhesive layer 14 located on a side away from the polarizing layer 11 and a second adhesive layer 15 located on the protective layer 13, wherein the material of the second adhesive layer is the same as that of the release area.

[0043] In this embodiment, the first adhesive layer 14 is arranged on the side away from the polarizing layer 11, and is used to bond the polarizing plate and the display panel. The second adhesive layer 15 is arranged on the protective layer 13, and is used to bond the polarizing plate and the back plate. In a specific example, the material of the second adhesive layer 15 is the same as the material of the release area 132, such as a pressure-sensitive adhesive (PSA) or an OC adhesive. Further, when forming the material layer of the release area 132, the second adhesive layer 15 can be formed in the same process, which saves process steps and improves manufacturing efficiency.

[0044] Figure 3 FIG. 4 shows a top view of the protective layer of an embodiment of the present invention. Figure 3 As shown, under the action of external force, the folding module using the polarizing plate can be bent inward or outward along the bending axis shown in Figure 3, and the protective layer is also bent inward or outward along the same bending axis.

[0045] Depend on Figure 4a As shown in the stress simulation diagram of the U-shaped folding module in the bending state, the stress on the polarizing plate is the largest at a certain position on both sides of the polarizing plate away from the bending axis. In an optional embodiment, the distance between the release area and the bending axis is set to Wherein, R is the bending radius of the folding module; the width of the release area is set to 3-4 mm.

[0046] The folding module of this embodiment is in a U shape when bent. Figure 4aAs shown, at this time, the position with the maximum stress is the end point of the folding module at the semicircle, that is, the length between the folding module at the end points on both sides and the folding module at the position of the bending axis is a quarter of a circle. Therefore, the distance between the release area and the bending axis in this embodiment is set to like Figure 3 As shown, in the plane where the protective layer is located, in the direction perpendicular to the bending axis, the length of the release zone is the width of the release zone. The width of this embodiment is set to 3-4 mm. On the basis of ensuring that the release zone has good bending properties, such as being difficult to break and difficult to peel off, the stress on the polarizing plate can be released through the release zone, thereby improving the overall bending performance and impact resistance of the polarizing plate.

[0047] In another specific example, Figure 4b As shown, the bent portion of the folding module is in a teardrop shape when in the bent state, that is, the folding module is a teardrop-shaped folding module, and its bent portion is an irregular semicircle. Figure 4b As shown in the stress diagram, the maximum stress of the folding module of this shape is distributed at the transition between the folding module of the bent part and the folding module of the straight part. At this time, the distance between the release area and the bending axis is set to be slightly larger than That is A constant value is added on the basis of , and the constant value can be ignored. Those skilled in the art can also choose according to the actual application to set the release area at the position with the maximum stress on both sides of the bending axis of the folding module as the design criterion, which will not be repeated here.

[0048] In an optional embodiment, if Figure 3 As shown, the release area extends along the axial direction of the bending axis.

[0049] like Figure 3 As shown in the top view of the protective layer shown, the axial direction of the bending axis is the Y direction, and the direction perpendicular to the bending axis in the plane of the protective layer is the X direction. The release area 132 of this embodiment is arranged on both sides of the bending axis and is symmetrically arranged about the bending axis to uniformly release the stress on the polarizing plate. The release area 132 of this embodiment extends along the Y direction. Exemplarily, the release area 131 extends from the lower end of the protection area 131 along the Y direction to the upper end, further fully releasing the stress on both sides of the bending axis. In an embodiment of the present invention, the extension length of the release area 132 in the Y direction is the length of the release area, and the length section of the release area 131 in the X direction is the width of the release area.

[0050] It is worth noting that the embodiment of the present invention does not limit the extension length of the release area in the Y direction. The release area of ​​this embodiment can be Figure 3The extension shown to the two ends of the protection zone may not extend to the two ends of the protection layer. Those skilled in the art may set the corresponding extension length according to actual application, which will not be described in detail here.

[0051] In an optional embodiment, the release area is provided with a plurality of openings 1321 arranged in an array, and the stress on the polarizing plate can be released through the plurality of openings 1321. Figure 3 As shown, the shape of the opening 1321 is a rhombus. In another specific example, as Figure 5a to 5c As shown, the shapes of the openings are oblong, square, and special-shaped structures. For another example, the shape of the openings can also be circular, rhombus, triangle, and other polygonal patterns that can be obtained by patterning. The openings in the embodiments of the present invention have the same shape, which is convenient for manufacturing. The embodiments of the present invention can also manufacture openings of different shapes in the same release area. Those skilled in the art should design according to actual applications, which will not be repeated here.

[0052] In an optional embodiment, the plurality of array-arranged openings are arranged non-uniformly in at least one direction. Figure 3 As shown, the shape of the opening 1321 is a diamond, and the diamond openings are arranged in an array throughout the release area, and the release area 132 is filled with a material different from that of the protection area 131. The diamond openings in the same column are arranged in sequence along the Y direction. In the Y direction, the spacing between adjacent diamond openings in the same column is consistent. In the X direction, the diamond openings in different columns are arranged unevenly, that is, the diamond openings in adjacent columns are arranged in a staggered manner. Exemplarily, the diamond openings in the first column are offset from the corresponding diamond openings in the second column by a certain distance in the Y direction, for example, offset by half the opening length of the diamond opening in the Y direction. This non-uniformly arranged structure can ensure the bending performance of the protective layer on the basis of fully releasing the stress on the polarizing plate, and avoid problems such as breakage caused by uniform arrangement.

[0053] In a specific example, if Figure 5a The opening 1321 is in the shape of an oblong extending in the Y direction. The distance between the upper and lower ends of the oblong opening 1321, i.e., the extension length in the Y direction, also referred to as the length of the opening, is about 3 mm to 6 mm. The distance between the left and right ends of the oblong opening 1321, i.e., the extension length in the X direction, also referred to as the width of the opening, is about 0.1 mm to 0.5 mm. The distance between adjacent oblong openings 1321 in the Y direction is about 0.1 to 0.5 mm, and the distance between adjacent oblong openings 1321 in the X direction is about 0.1 to 0.5 mm.

[0054] In another specific example, Figure 5bThe opening shape 1321 is a square inclined relative to the X-axis and the Y-axis, the width of the square opening 1321 is about 0.2 to 0.5 mm, the distance between adjacent square openings 1321 in the Y direction is about 0.2 to 0.5 mm, and the adjacent square openings 1321 in the X direction are staggered, and the staggered distance can be half of the distance between the two opposite ends of the square opening.

[0055] In another specific example, Figure 5c The opening shape 1321 is a special-shaped opening extending in the Y direction, and the special-shaped opening 1321 is composed of arcs connected at both ends of a rectangle. The distance between the upper and lower ends of the special-shaped opening 1321, that is, the extension length in the Y direction, also known as the length of the opening, is about 3mm to 6mm. The distance between the left and right ends of the special-shaped opening, that is, the extension length in the X direction, also known as the width of the special-shaped opening, is about 0.1mm to 0.5mm. The distance between adjacent special-shaped openings 1321 in the Y direction is about 0.1 to 0.5mm, and in the X direction, the distance between adjacent special-shaped openings 1321 is about 0.1 to 0.5mm.

[0056] In a specific example, the layer structure of the polarizing plate of the embodiment of the present invention is as follows: Figure 2 As shown, the thickness of each film layer can be: the first adhesive layer 14 is 10-30μm, the first filter layer 111 is 1-5μm, preferably 1μm, the second filter layer 112 is 1-5μm, preferably 1μm, the polarizing layer 12 is 2-10μm, preferably 5μm, the protective layer 13 is 10-50μm, and the second adhesive layer 15 is 10-15μm. The polarizing plate arranged in this structure can realize both a light and thin design and a small bending radius design.

[0057] This embodiment simulates and analyzes each film layer of the polarizing plate and finds that the location where the polarizing plate breaks is mostly the protective layer, and the breakage of the protective layer further causes the polarizing layer to fail. The release area of ​​this embodiment can fully release the stress on the polarizing plate when bending, thereby reducing the risk of polarizing plate breakage, and improving the bending performance and impact resistance on the basis of ensuring a small bending radius design.

[0058] Another embodiment of the present invention provides a folding module, such as Figure 6 As shown, the folding module 2 includes: a support 21, a connecting layer 22, a back film 23, a display panel 24, a polarizing plate 1 as in the above embodiment of the present invention, and a cover plate 25 which are stacked in sequence.

[0059] The folding module of the polarizing plate of the above embodiment of the present invention is applied. For example, the folding module of the embodiment of the present invention can realize a small bending radius design when the bending radius is R1, and also has good bending performance, impact resistance and thin overall thickness.

[0060] In a specific example, when the polarizing plate is Figure 2 In the structure shown, that is, the polarizing plate 1 includes a first adhesive layer 14 located on the side away from the polarizing layer 11 and a second adhesive layer 15 located on the protective layer 13, the first adhesive layer 14 of this embodiment is bonded to the display panel 24, such as the encapsulation layer of the display panel. The second adhesive layer 15 is connected to the cover plate 25, and the cover plate 25 is directly bonded by the second adhesive layer 15 with adhesiveness, without setting an OC adhesive layer between the polarizing plate and the cover plate for bonding, thereby further reducing the overall thickness of the folding module.

[0061] In another specific example, an OC adhesive layer is further provided between the polarizing plate and the cover plate, and the protective layer of the polarizing plate and the cover plate are connected by the OC adhesive layer, or the second adhesive layer of the polarizing plate and the cover plate are connected by the OC adhesive layer. This arrangement can improve the overall reliability of the folding module and avoid film peeling.

[0062] In a specific example, the manufacturing process of the folding module of the embodiment of the present invention may include: sequentially forming a stacked connection layer 22, a back film 23, a display panel 24, a polarizing plate 1 and a cover plate 25 on a bracket 21. If OC glue is used to bond the polarizing plate and the cover plate, the OC glue layer can be applied in a pre-coated manner. Then the edge is cut by an integrated cutting process. In this embodiment, the integrated cutting process can ensure that the cover plate, the polarizing plate and the display panel are flush with each other, effectively reducing the stress at the cover plate, reducing the local force at the cover plate, and avoiding the phenomenon of buckling and warping of the cover plate and each film layer.

[0063] In another specific example, the projection area of ​​each film layer on the bracket 21 (such as the connecting layer 22, the back film 23, the display panel 24, the polarizing plate 1 and the cover plate 25) falling on the bracket 21 is smaller than the projection area of ​​the bracket 21, that is, the edge of the bracket can extend outward by a certain distance compared with the edges of other layer structures, such as 0.2 to 0.5 mm. This structural setting can protect the various film layers on the bracket, such as the connecting layer, the back film, the display panel, the polarizing plate and the cover plate, reduce the damage to other layer structures caused by collision, and improve the impact resistance of the folding module.

[0064] In an optional embodiment, if Figure 7 As shown, the connection layer 22 includes: a base 221, a first adhesive layer 222 connecting the base 221 and the bracket 21, and a second adhesive layer 223 connecting the base 221 and the back film 23. In a specific example, the connection layer and the display panel with the back film attached are bonded and fixed by the second adhesive layer using a roller bonding method. Exemplarily, the existing base material is foam.

[0065] In an optional embodiment, the material of the substrate is polyethylene terephthalate or polyimide. This embodiment uses polyethylene terephthalate or polyimide materials to make the substrate, and uses the good bending performance and light and thin structure of this type of material to achieve a light and thin design of the folding module. However, in the process of making the folding module using the connecting layer formed by this type of substrate material, especially when the connecting layer is bonded to the display panel, it is easy to generate bubbles in the edge area of ​​the bonding place, and steam bags or warping in the middle area, resulting in a low yield of the folding module product. Regarding this phenomenon, the inventor found that the exhaust performance of the substrate made of polyethylene terephthalate or polyimide is poor, resulting in a long bubble elimination time, and may produce rebound bubbles during high-temperature processing. This is because the modulus of this type of material is higher than that of the foam material. In addition, the commonly used first adhesive layer and second adhesive layer are both set as a whole layer, resulting in poor exhaust performance of the connecting layer.

[0066] To solve this problem, the inventor tried to set the second adhesive layer to a whole grid structure to shorten the time for bubble elimination and increase the exhaust performance. However, the problem caused by this method is that when the connection layer and the display panel are bonded, the middle area of ​​the bonding place is warped, resulting in the phenomenon of film peeling. In addition, the inventor further found that due to the deflection of the roller itself, when the roller is used to bond the film layer, the edge area of ​​the display panel is unevenly stressed, resulting in bubbles in the edge area of ​​the bonding place.

[0067] For the above phenomenon and problems, in an optional embodiment, as Figure 8 As shown, a plurality of grooves 2231 are formed in the edge area of ​​the second adhesive layer 223. In this embodiment, the central area of ​​the second adhesive layer is set as a flat adhesive area 2232, and a flat adhesive is formed in this area. A plurality of grooves 2231 surrounding the flat adhesive area 2232 are formed outside the flat adhesive area 2232. By combining the grid grooves with the entire layer of flat adhesive, it is possible to ensure a close fit in the central area and avoid warping and peeling of the film layer in the middle area, and to improve the overall exhaust performance of the connection layer and eliminate poor bubbles in the edge area. In a specific example, a degassing process is used to further eliminate the enclosed bubbles in the edge grooves, thereby further improving product quality.

[0068] For example, Figure 8The grooves 2231 shown are in a grid shape. The shape of the grooves can be rectangular, triangular, rhombus, circular, polygonal or a combination thereof, which will not be described here. In an optional embodiment, the width of the edge area where a plurality of grooves are formed is 25mm to 30mm; the depth of the plurality of grooves is 5μm to 8μm. Exemplarily, taking the square groove as an example, the side length can be 50 to 300um. For another example, the thickness of the first adhesive layer and the second adhesive layer are respectively approximately 10 to 40um, the colloid temperature change point, that is, the Tg point is <-25°C, the normal temperature modulus is 30 to 300Kpa, and the thickness of the substrate is approximately 25 to 75um. Such a structural design, on the basis of achieving a lightweight design, also has good exhaust performance and bending performance.

[0069] The folding module formed by the polarizing plate with a release area of ​​the embodiment of the present invention and the connecting layer of the embodiment of the present invention can not only achieve a lightweight design, but also achieve a small bending radius design, and has good impact resistance and reliability, and has broad application prospects.

[0070] Another embodiment of the present invention provides a display device, including the folding module of the above embodiment of the present invention. The display device can be any product or component with a folding display function, such as electronic paper, mobile phone, tablet computer, television, monitor, notebook computer, etc., which is not limited in this embodiment.

[0071] It should be noted that, 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 field, other different forms of changes or modifications can be made on the basis of 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 polarizing plate for a foldable display module, characterized in that: It includes a filter layer, a polarizing layer and a protective layer stacked in sequence, wherein: The protective layer includes a protection zone and a release zone at both sides of the bending axis of the folding display module, and the release zone is used to release the stress on the polarizing plate in the bent state. The release area extends along the axial direction of the bending axis, and the release area is provided with a plurality of openings arranged in an array, and the openings extend from a surface of the protective layer away from the polarizing layer to a surface of the protective layer close to the polarizing layer, and leak out a portion of the surface of the polarizing layer away from the filter layer; When the foldable display module is a U-shaped foldable module, the distance between the release area and the bending axis is set to Wherein, R is the bending radius of the folding module; When the foldable display module is a teardrop-shaped foldable module, the distance between the release area and the bending axis is set to plus a constant value.

2. The polarizing plate according to claim 1, characterized in that The plurality of array-arranged openings are arranged non-uniformly in at least one direction.

3. The polarizing plate according to claim 1, characterized in that The width of the release area is set to 3-4 mm.

4. The polarizing plate according to claim 1, characterized in that The material of the protection zone is different from the material of the release zone.

5. The polarizing plate according to claim 1, wherein: The polarizing plate further includes: a first adhesive layer located on a side away from the polarizing layer and a second adhesive layer located on the protective layer, wherein the material of the second adhesive layer is the same as that of the release area.

6. A folding module, characterized in that: The folding module comprises: a bracket, a connecting layer, a back film, a display panel, a polarizing plate according to any one of claims 1 to 5, and a cover plate which are stacked in sequence.

7. The folding module according to claim 6, characterized in that: The connection layer includes: a base, a first adhesive layer connecting the base and the bracket, and a second adhesive layer connecting the base and the backing film, wherein a plurality of grooves are formed at the edge area of ​​the second adhesive layer.

8. The folding module according to claim 7, characterized in that: The material of the substrate is polyethylene terephthalate or polyimide.

9. The folding module according to claim 8, characterized in that: The width of the edge region where the plurality of grooves are formed is 25 mm to 30 mm; the depth of the plurality of grooves is 5 μm to 8 μm.

10. A display device, characterized in that: It comprises a folding module as described in any one of claims 6 to 9.

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