Polarizing plate, polarizing plate precursor, method for producing the same, display panel, and display device

Abstract

The application provides a polarizing sheet, a preparation method thereof, a display panel and a display device. The polarizing sheet comprises a pressure-sensitive adhesive layer, a first protective layer, a polarizing layer and a second protective layer which are stacked in sequence. The polarizing layer comprises a functional area and a sealing adhesive. The sealing adhesive is arranged around the side periphery of the functional area. The sealing adhesive comprises an inner peripheral wall and an outer peripheral wall in the radial direction of the functional area. The inner peripheral wall of the sealing adhesive is attached to the side peripheral wall of the functional area. The thickness of the sealing adhesive is the same as the thickness of the functional area. The sealing adhesive is attached to the first protective layer and the second protective layer on both sides. The outer peripheral wall of the sealing adhesive is aligned with the outer peripheral wall of the pressure-sensitive adhesive layer, the first protective layer and the second protective layer in the thickness direction of the polarizing sheet. The outer peripheral contour of the polarizing sheet comprises a plurality of protruding tooth portions. The tooth height of the tooth portion is perpendicular to the thickness direction of the polarizing sheet. According to the polarizing sheet, the sealing adhesive precisely covers the outer peripheral wall of the functional area to seal the functional area.

Description

Technical Field

[0001] This invention relates to the field of polarizer technology, specifically to a polarizer, a polarizer substrate and its preparation method, a display panel and a display device. Background Technology

[0002] In the field of display technology, polarizers (POLs) are one of the core components of display panels such as AMOLED and LCD. Their main function is to selectively filter natural light, reducing the interference of ambient light reflection on the display effect, thereby improving screen contrast and viewing angle. However, existing polarizers have significant defects in reliability environments such as high temperature and high humidity: the core layer of the polarizer (such as the polarizing layer) is usually made of polymer materials such as polyvinyl alcohol (PVA), which are sensitive to temperature and humidity. In high temperature (such as 85°C) and high humidity (such as 85% RH) environments, the polarizing layer is prone to absorbing water and expanding or losing water and shrinking, resulting in changes in the overall size of the polarizer. When the polarizing layer shrinks, it will cause stress concentration in adjacent layers, leading to interlayer peeling or cracks, ultimately causing failure phenomena such as black spots and bubbles in the display panel. The sealing structure of existing polarizers mostly relies on an adhesive layer coated on the entire edge, which is difficult to effectively prevent moisture penetration.

[0003] Therefore, a new type of polarizer structure is urgently needed. Summary of the Invention

[0004] In view of this, the present invention aims to provide a polarizer, a polarizer substrate and its preparation method, a display panel and a display device, to solve the problem that polarizers in the prior art are prone to absorbing water and swelling or losing water and shrinking.

[0005] The first aspect of this application discloses a polarizer, comprising a pressure-sensitive adhesive layer, a first protective layer, a polarizing layer, and a second protective layer stacked sequentially along the thickness direction of the polarizer. The polarizing layer includes a functional region and a sealant. The sealant is disposed around the lateral periphery of the functional region and includes an inner peripheral wall and an outer peripheral wall along the radial direction of the functional region. The inner peripheral wall of the sealant is attached to the lateral peripheral wall of the functional region. In the thickness direction of the polarizer, the thickness of the sealant is the same as the thickness of the functional region. The sealant is attached to both the first and second protective layers on both sides. The outer peripheral wall of the sealant is aligned with the outer peripheral walls of the pressure-sensitive adhesive layer, the first protective layer, and the second protective layer in the thickness direction of the polarizer. The outer periphery defined by the pressure-sensitive adhesive layer, the first protective layer, the polarizing layer, and the second protective layer includes a plurality of protruding teeth, the tooth height of which is perpendicular to the thickness direction of the polarizer.

[0006] According to the polarizer of this application, the teeth include one of triangular, trapezoidal and arc-shaped.

[0007] According to the polarizer of this application, the inner and outer peripheral walls of the sealant have the same outline shape as the functional area.

[0008] The second aspect of this application proposes a polarizer substrate for processing the aforementioned polarizer. The polarization layer of the polarizer substrate includes multiple arrayed functional regions. Each functional region is surrounded by a filling region in the lateral direction. There is a gap between two adjacent filling regions, and the filling region is filled with sealant.

[0009] Optionally, multiple functional areas are arranged in a directional array with the first direction as the row, and the center position of the functional area in any row is projected onto the first direction, between the center positions of two adjacent functional areas in the same row and adjacent to that functional area, and projected onto the first direction.

[0010] A third aspect of this application discloses a method for preparing a polarizer substrate, comprising:

[0011] A polarization layer is composited on one side surface of the first protective layer;

[0012] The polarization layer is etched to form multiple arrays of functional areas and a pattern of filler areas surrounding each of the functional areas;

[0013] Fill the filling area with sealant and then cure the sealant.

[0014] A second protective layer is then bonded onto the polarizing layer after the sealant has cured;

[0015] Pressure-sensitive adhesive is applied to the other side of the first protective layer to form a pressure-sensitive adhesive layer.

[0016] The fourth aspect of this application discloses a display panel, including a substrate and the aforementioned polarizer. The polarizer is attached to the surface of the substrate. The substrate includes a display area and a non-display area disposed outside the display area. The non-display area includes dam areas disposed sequentially outward from the display area. The dam area includes at least one dam extending along the boundary of the display area. The orthographic projection of the edge of the polarizer in the thickness direction of the substrate is located outside the outermost dam. There is a predetermined distance between the edge of the polarizer and the outer boundary of the dam.

[0017] Optionally, the preset distance is greater than or equal to 200 μm.

[0018] Optionally, the non-display area also includes a bonding area located on the side of the dam area away from the display area, with the absorption axis of the polarizer parallel to the long side of the bonding area.

[0019] The fifth aspect of this application discloses a display device including the aforementioned display panel.

[0020] The technical solutions provided in this application have the following advantages compared with the prior art:

[0021] The polarizer provided in this application includes a pressure-sensitive adhesive layer, a first protective layer, a polarizing layer, and a second protective layer stacked sequentially along the thickness direction of the polarizer. The stacked arrangement of the pressure-sensitive adhesive layer, the first protective layer, the polarizing layer, and the second protective layer enhances the overall rigidity of the polarizer and reduces warping deformation caused by external forces or changes in temperature and humidity. The polarizing layer, sandwiched between the first and second protective layers, effectively isolates external mechanical impacts and protects the core optical functions. A sealant is arranged around the periphery of the functional area, completely overlapping with the outer wall of the functional area, ensuring the functional area is completely sealed. This avoids potential positional deviations that may occur during subsequent adhesive application and ensures precise coverage of the outer wall of the functional area. Furthermore, the sealant is also sandwiched between the first and second protective layers, adhering to them and preventing interface gaps between the sealant and either the first or second protective layer. This reduces the risk of delamination, enhances the integrity of the polarizer's edge structure, further improves the sealing effect on the functional area, prevents moisture or impurities from intruding through gaps, and extends the service life of the polarizer. Attached Figure Description

[0022] Figure 1 The image shown is a side view of a polarizer according to an embodiment of this application;

[0023] Figure 2 The image shown is a top view of a polarizer according to an embodiment of this application;

[0024] Figure 3 The image shown is a top view of a polarizer according to another embodiment of this application;

[0025] Figure 4 The image shown is a top view of a polarizer plate according to an embodiment of this application;

[0026] Figure 5 The image shown is a top view of a polarizer plate according to another embodiment of this application;

[0027] Figure 6 The diagram shown is a flowchart illustrating a method for preparing a polarizer substrate according to an embodiment of this application.

[0028] Label Explanation:

[0029] Pressure-sensitive adhesive layer 10, first protective layer 20, polarizing layer 30, functional area 31, sealant 32, second protective layer 40, teeth 50.

[0030] Polarizing film base plate 100, glue filling area 101. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-3 As shown, the polarizer according to an embodiment of this application includes a pressure-sensitive adhesive layer 10, a first protective layer 20, a polarizing layer 30, and a second protective layer 40, which are sequentially stacked along the thickness direction of the polarizer. The polarizing layer 30 includes a functional region 31 and a sealant 32. The sealant 32 is disposed around the lateral periphery of the functional region 31. The sealant 32 includes an inner peripheral wall and an outer peripheral wall along the radial direction of the functional region 31. The inner peripheral wall of the sealant 32 adheres to the lateral peripheral wall of the functional region 31, sealing the polarizer in the thickness direction. The thickness of the adhesive 32 is the same as the thickness of the functional area 31. The sealant 32 is bonded to both the first protective layer 20 and the second protective layer 40 on both sides. The outer peripheral wall of the sealant 32 is aligned with the outer peripheral walls of the pressure-sensitive adhesive layer 10, the first protective layer 20 and the second protective layer 40 in the thickness direction of the polarizer. The outer peripheral contour defined by the pressure-sensitive adhesive layer 10, the first protective layer 20, the polarizing layer 30 and the second protective layer 40 includes a plurality of protruding teeth 50. The tooth height of the teeth 50 is perpendicular to the thickness direction of the polarizer.

[0033] In detail, the first protective layer 20 is typically triacetyl cellulose (TAC), the second protective layer 40 is typically triacetyl cellulose (TAC) and polyethylene terephthalate (PET), etc., and the polarizing layer 30 is typically polyvinyl alcohol (PVA) and modified materials based on PVA. It is mainly used in the processing of polarizers required for LCD / OLED displays. Of course, the polarizing layer 30 can also be other materials that can allow polarized light to pass through only in a specific direction, such as nanogratings. In some embodiments, a release layer is also provided on the side of the pressure-sensitive adhesive layer 10 facing away from the first protective layer 20; of course, depending on the application, the polarizer may also include other film layers, which will not be elaborated here.

[0034] The shape of functional area 31 includes, but is not limited to, circles, ovals, squares, rectangles, rounded rectangles, triangles, rhombuses, and hexagons.

[0035] The sealant 32 is formed by water curing the sealant 32 applied to the filling area 101. The sealant 32 can be optically clear adhesive (OCA) or epoxy resin, etc. The outer peripheral wall contour of the sealant 32 of the polarizer can be the same as or different from the side peripheral wall contour of the functional area 31. For example, when the shape of the functional area 31 is circular, the outer peripheral wall contour of the sealant 32 can be circular, elliptical, or rectangular. Of course, it is best to be circular, so that the width of the sealant 32 in the radial direction can be approximately consistent.

[0036] In one specific embodiment of this application, the sealant 32 is optically clear adhesive (OCA), the first protective layer 20 is typically triacetyl cellulose (TAC), and the second protective layer 40 is triacetyl cellulose (TAC).

[0037] The stacked arrangement of pressure-sensitive adhesive layer 10, first protective layer 20, polarizing layer 30, and second protective layer 40 enhances the overall rigidity of the polarizer and reduces warping deformation caused by external forces or temperature and humidity changes. The polarizing layer 30, sandwiched between the first protective layer 20 and the second protective layer 40, effectively isolates external mechanical impacts and protects the core optical functions. Sealant 32 is arranged around the periphery of the functional area 31, and the sealant 32 completely overlaps with the outer peripheral wall of the functional area 31. The functional area 31 is completely sealed by the sealant 32, avoiding possible positional deviations that may occur when applying adhesive later, and ensuring that the sealant 32 accurately covers the outer peripheral wall of the functional area 31. Furthermore, the sealant 32 is also sandwiched between the first protective layer 20 and the second protective layer 40. The sealant 32 adheres to the first protective layer 20 and the second protective layer 40, avoiding the presence of interface gaps between the sealant 32 and the first protective layer 20 or the second protective layer 40. This reduces the risk of delamination, enhances the integrity of the polarizer edge structure, and further improves the sealing effect on the functional area 31, preventing moisture or impurities from entering through the gaps and extending the service life of the polarizer.

[0038] In the above embodiments, the pressure-sensitive adhesive layer 10 is used to bond with the substrate. In a specific embodiment, the polarizer further includes an optical film, one side of which is bonded to the pressure-sensitive adhesive layer 10, and the other side of which is also provided with another pressure-sensitive adhesive layer 10 to bond with the substrate.

[0039] In the thickness direction of the polarizer, the thickness of the sealant 32 is the same as the thickness of the functional area 31. The sealant 32 is adhered to both the first protective layer 20 and the second protective layer 40 on both sides. In this way, the sealant 32 completely covers the circumferential edge of the functional area 31 throughout its entire thickness direction. Simultaneously, the fact that the thickness of the sealant 32 is the same as the thickness of the functional area 31 ensures that the sealant 32 can be tightly adhered to the first protective layer 20 and the second protective layer 40, forming a complete and continuous sealing interface. This reduces the risk of delamination between the sealant 32 and the first and second protective layers 20 and 40, enhances the integrity of the polarizer's edge structure, and thus improves the sealing effect. Furthermore, this also reduces the processing difficulty of the first protective layer 20 and the second protective layer 40, thereby helping to reduce production costs.

[0040] The outer peripheral wall of the sealant 32 is aligned with the outer peripheral walls of the pressure-sensitive adhesive layer 10, the first protective layer 20, and the second protective layer 40 in the thickness direction of the polarizer. This reduces the complex edge processing of the multilayer film, lowers the die-cutting precision requirements, avoids defects caused by edge misalignment, and improves the yield rate.

[0041] The outer peripheral contour defined by the pressure-sensitive adhesive layer 10, the first protective layer 20, the polarizing layer 30, and the second protective layer 40 includes multiple protruding teeth 50, the tooth height of which is perpendicular to the thickness direction of the polarizer. The teeth 50 protrude along the radial direction of the polarizer, and the multiple teeth 50 form a wavy edge on the outer peripheral side of the polarizer. When the polarizer is applied in a display panel, the tooth tips of the teeth 50 can suppress excessive shrinkage, and the tooth roots of the teeth 50 allow for a certain amount of elastic deformation to absorb local strain. This can convert the concentrated tensile force generated by the shrinkage of the screen into stress along the teeth 50 and at the joints between adjacent teeth 50, thereby suppressing shrinkage and reducing the possibility of cracks caused by screen shrinkage.

[0042] In some embodiments, the tooth 50 includes one of a triangle, a trapezoid, and an arc.

[0043] When the tooth 50 is triangular, it is usually 60°-90°. The tooth 50 can also be trapezoidal, isosceles trapezoidal or isosceles trapezoidal; of course, the tooth 50 can also be arc-shaped.

[0044] It should be noted that the inner peripheral wall of the sealant 32 has the same outline shape as the functional area 31, while the outer peripheral wall of the sealant 32 may have a different outline shape than the functional area 31. For example, the outline of the functional area 31 may also have the same shape as the outer peripheral wall of the sealant 32, such as a triangle, trapezoid, or arc. Figure 3 The diagram shown is a schematic of a portion of the polarizer's film layers. Figure 3For ease of display, the topmost layer is the polarization layer 30, in which the teeth 50 are arc-shaped. Figure 3 The toothed portion 50 shown is the portion defined by the sealant 32, the first protective layer 20, and the pressure-sensitive adhesive layer 10.

[0045] According to the polarizer of this application embodiment, the inner and outer peripheral walls of the sealant 32 have the same outline shape as the functional area 31, so that the width of the sealant 32 in the radial direction remains uniform. This facilitates uniform shrinkage of the sealant 32 layer during curing, reduces the accumulation of internal stress caused by local shrinkage differences, and suppresses delamination. For example, as Figure 5 As shown, the inner and outer peripheral walls of sealant 32 are both circular, resulting in a lower edge loss rate; alternatively, the inner and outer peripheral walls of sealant 32 are both circular, allowing for a more compact arrangement; and so on. Figure 4 As shown; the inner peripheral wall of sealant 32 is square and the outer peripheral wall of sealant 32 is round, which facilitates filling; the inner peripheral wall of sealant 32 is hexagonal and the outer peripheral wall of sealant 32 is hexagonal; the inner peripheral wall of sealant 32 is rounded rectangle and the outer peripheral wall of sealant 32 is rounded rectangle. The above are just examples and are not exhaustive.

[0046] like Figure 4 and Figure 5 As shown, according to an embodiment of this application, a polarizing plate 100 for processing the above-mentioned polarizing film has a polarizing layer 30 including a plurality of arrayed functional regions 31. Each functional region 31 is provided with a filling region 101 in the lateral circumferential direction. There is a gap between two adjacent filling regions 101, and the filling region 101 is filled with sealant 32.

[0047] The array of multiple functional areas 31 allows each area corresponding to a functional area 31 to be independently and completely separated into a polarizer when the polarizer is cut along the outer periphery of the filling area 101. This arrangement can improve the utilization rate of the polarizer material, reduce waste, and reduce edge loss when the polarizer is cut as a whole.

[0048] The inner peripheral wall of the filling area 101 has the same shape as the functional area 31, while the outer peripheral wall of the filling area 101 may have the same or different shape as the inner peripheral wall of the filling area 101. For example, Figure 5 As shown, the inner peripheral wall of the glue-filling area 101 is circular, and the outer peripheral wall of the glue-filling area 101 is also circular, resulting in a lower edge loss rate. Alternatively, the inner peripheral wall of the glue-filling area 101 is circular, and the outer peripheral wall is square, resulting in a more compact arrangement. Figure 4As shown, the inner peripheral wall of the glue-filling area 101 is square, and the outer peripheral wall of the glue-filling area 101 is square; the inner peripheral wall of the glue-filling area 101 is square, and the outer peripheral wall of the glue-filling area 101 is circular, which facilitates glue filling; the inner peripheral wall of the glue-filling area 101 is hexagonal, and the outer peripheral wall of the glue-filling area 101 is hexagonal; the inner peripheral wall of the glue-filling area 101 is rounded rectangle, and the outer peripheral wall of the glue-filling area 101 is rounded rectangle. The above are just examples and are not exhaustive.

[0049] The spacing between adjacent filling areas 101 provides ample space for the sealant 32, ensuring it completely covers the edges of the functional area 31. This also prevents interference between the forming of adjacent functional areas 31 during cutting, improving cutting accuracy. Most importantly, this reduces uneven distribution of the sealant 32 caused by its flow between adjacent filling areas 101, preventing interfacial stress caused by inconsistent shrinkage of the sealant 32 when adjacent filling areas 101 are connected.

[0050] like Figure 4 and Figure 5 As shown, in some embodiments, multiple functional areas 31 are arranged in a directional array with a first direction as the row. The center position of any row of functional areas 31 is projected onto the first direction, and the center positions of two adjacent functional areas 31 in the same row are projected onto the first direction.

[0051] In the above embodiments, multiple functional areas 31 are arranged in an alternating pattern between rows, which can reduce the row spacing, integrate more functional areas 31 in the same area, improve space utilization, and reduce costs, especially for hexagons or rounded rectangles.

[0052] For example, in one specific embodiment, the functional area 31 is circular with a diameter of D, the filling area 101 is annular, the width of the sealant 32 in the radial direction of the functional area 31 is h, the diameter of the outer peripheral wall of the filling area 101 is D+2h, and the functional areas 31 of adjacent rows are offset by D / 2 along the first direction. For instance, counting from the same end, the distance between the orthographic projection of the center position of the second functional area 31 in the second row and the orthographic projection of the center position of the second functional area 31 in the third row in the first direction is D / 2.

[0053] For example, in a specific embodiment, the functional area 31 is a square with a side length of L, the glue filling area 101 is a square with a side length of L on the inner periphery of the glue filling area 101 and a side length of L+2h on the outer periphery of the glue filling area 101. The functional area 31 in each row is offset by L / 2 in the first direction relative to the functional area 31 in the adjacent row. For example, counting from the same end, the distance between the orthographic projection of the center position of the second functional area 31 in the second row in the first direction and the orthographic projection of the center position of the second functional area 31 in the third row in the first direction is L / 2.

[0054] For example, the polarizer includes a circular functional area 31 and an elliptical functional area 31, and the shape of the filler area 101 matches the shape of the corresponding functional area 31.

[0055] Each polarizer is cut from the original polarizer plate 1, typically using laser cutting, which directly cuts out the serrated edges 50. The distance between the edge of the polarizer and the edge of the display area meets the requirement of no side-view light leakage. Furthermore, because the edges of the polarizer have serrations, they differ significantly from the straight edges of the display substrate, allowing monitoring equipment to distinguish between them. This improves the accuracy of the monitoring equipment in identifying the polarizer and the display substrate, thereby enhancing the ability to control product quality and preventing batch defects.

[0056] like Figure 6 As shown, the method for preparing a polarizer according to an embodiment of this application includes:

[0057] Step S10: Composite polarization layer 30 is applied to one side surface of the first protective layer 20;

[0058] Step S20: The polarization layer 30 is etched to form a pattern of multiple arrays of functional regions 31 and a filling region 101 surrounding each of the functional regions 31.

[0059] Step S30: Fill the filling area 101 with sealant 32 and cure the filled sealant 32.

[0060] Step S40: Apply the second protective layer 40 onto the polarizing layer 30 after the sealant 32 has cured;

[0061] Step S50: Apply pressure-sensitive adhesive to the other side surface of the first protective layer 20 to form a pressure-sensitive adhesive layer 10.

[0062] In step S10, since the polarization layer 30 is the core optical functional part of the polarizer, it is first combined with the first protective layer 20 to provide a stable substrate for subsequent fine processing operations such as photolithography and etching, ensuring that the polarization layer 30 and the first protective layer 20 are in a tightly bonded state for subsequent processing, and avoiding the displacement or damage of the polarization layer 30 during subsequent processing.

[0063] It is understandable that when the polarization layer 30 is laminated onto the first protective layer 20, the surface of the first protective layer 20 needs to be cleaned.

[0064] In step S20, photoresist is coated on the surface of the polarizing layer 30 facing away from the first protective layer 20. Exposure and development are then performed to form a pattern of multiple arrayed functional regions 31 and a filler region 101 surrounding each functional region 31. The developed polarizing layer 30 is then etched. More specifically, the composite material is placed on a photoresist coating machine, and photoresist is applied to the material. The photoresist-coated material is placed on the stage of the photolithography machine, and the mask is accurately aligned with the material surface before exposure. After exposure, the material is placed in a developing machine for development. After development, it is rinsed with deionized water to remove excess developer. The developed material is then placed in an etching machine for etching. During etching, laser etching, chemical etching, or a combination of both can be used.

[0065] In step S30, a suitable sealant 32 is selected, and the etched material surface is cleaned using deionized water and nitrogen to remove etching residues and dust. The cleaned material is placed on the worktable of a slot coater, and the sealant 32 is evenly filled into the filling area 101 through the slot coater head. After filling, the sealant 32 is cured. This allows for timely filling and curing of the filling area 101 with sealant 32 after the pattern is formed and etched, immediately protecting the edges of the functional area 31 and preventing the intrusion of moisture and impurities. The immediate plasma treatment after etching (e.g., O2 / Ar = 1:3, power 100W) increases surface energy and enhances the adhesion of the sealant.

[0066] In step S40, a second protective layer 40 is attached to the polarizing layer 30 after the sealant 32 has been cured, which can further protect the polarizing layer 30 and the sealant 32 and reduce warping deformation caused by external force or temperature and humidity changes.

[0067] In step S50, a pressure-sensitive adhesive layer 10 is finally coated on the other side surface of the first protective layer 20. The function of the pressure-sensitive adhesive layer 10 is to bond it to the substrate. This final step is to avoid contamination or damage to the pressure-sensitive adhesive layer 10 during the preceding processing, and to ensure the adhesion and bonding effect of the pressure-sensitive adhesive layer 10.

[0068] It should be noted that before each of the above steps, such as lamination and coating, the corresponding surfaces can be cleaned and pretreated (e.g., plasma treatment). Also, after the sealant has cured to 32, the sealing effect should be checked in time for timely adjustments.

[0069] The display panel according to an embodiment of this application includes a substrate and the aforementioned polarizer. The polarizer is attached to the surface of the substrate. The substrate includes a display area and a non-display area disposed outside the display area. The non-display area includes dam areas disposed sequentially outward from the display area. The dam area includes at least one dam extending along the boundary of the display area. The orthographic projection of the edge of the polarizer in the thickness direction of the substrate is located outside the outermost dam. There is a predetermined distance between the edge of the polarizer and the outer boundary of the dam.

[0070] In the above embodiments, by setting up dams to avoid problems such as water and oxygen intrusion, the dam area includes at least one dam extending along the boundary of the display area. This means that, in some embodiments, the dam area includes one dam extending along the boundary of the display area, and the orthographic projection of the edge of the polarizer in the thickness direction of the substrate is located outside the outermost dam. In other embodiments, the dam area includes multiple dams extending along the boundary of the display area, for example, including two dams, which are defined as the first dam and the second dam, respectively. The first dam is closer to the display area, and the second dam is farther from the display area. Then, the orthographic projection of the edge of the polarizer in the thickness direction of the substrate is located outside the second dam. Here, "outer side" refers to the side of the dam farther from the display area, and "inner side" refers to the side of the dam closer to the display area.

[0071] The functional area 31 of the polarization region completely covers the display area of ​​the substrate, ensuring that light can be polarized when passing through the polarizer. The cut edge of the polarizer is located in the non-display area of ​​the substrate. The preset distance restricts the stress concentration area caused by the shrinkage of the polarization layer to the outside of the dam, avoiding direct action on the DAM encapsulation layer (Display Area Module, including the CVD encapsulation layer). The CVD film, which cannot be directly transmitted to the inside, avoids applying tensile force to the encapsulation layer. At the same time, the sealant 32 completely wraps the cut edge of the polarization layer 30, which can isolate moisture impurities and slow down the shrinkage of the polarization layer 30. Even when the polarization layer shrinks, the stress concentration area is located on the outside of the dam, and the edge of the display area where the CVD layer (Chemical Vapor Deposition, used as the encapsulation layer of the display area module) is located is in a low-strain region, which can prevent interface peeling.

[0072] The substrate material can be soda-lime glass, quartz glass, sapphire glass, or other glass materials, or it can be stainless steel, aluminum, nickel, or other metal materials. In another embodiment of this application, the substrate material can be polymethyl methacrylate (PVP), polyvinyl alcohol (PVA), polyvinyl phenol (PVP), polyethersulfone (PES), polyimide, polyamide, polyacetal, polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or a combination thereof. In yet another embodiment of this application, the substrate is a flexible substrate, and the material can be polyimide (PI). The substrate can also be a composite of multiple materials. For example, in a specific embodiment, the substrate may include a base film layer, a pressure-sensitive adhesive layer 10, a first polyimide layer and a second polyimide layer stacked sequentially.

[0073] In one specific embodiment, the substrate is a flexible substrate. The non-display area of ​​the substrate includes a dam area, a transition area, and a bending area. The transition area is located between the dam area and the bending area. The bonding area is located on the side of the bending area away from the transition area. The bending area bends towards the back of the substrate, so that the bonding area is located on the back of the substrate, thereby reducing the size of the display area. After the display panel is formed, a portion of the dam area 20, the transition area 30, and the bending area 40 are located at the edge of the display panel. The edge of the polarizer is located in the transition area. The transition area 30 includes an inorganic layer 301 and at least one organic buffer layer 302. The organic buffer layer includes multiple hollow areas. Because the organic buffer layer includes multiple hollow areas, it can better buffer external forces. When the display panel is impacted by an external object or pressed by an external force, the organic buffer layer can buffer the impact, preventing damage to the inorganic layer and the polarizer due to external forces, thus avoiding abnormal display phenomena such as bright lines when the display area displays an image, and improving the display effect of the display panel.

[0074] The display panel according to the embodiments of this application, due to the presence of the aforementioned polarizer, is not sensitive to high temperature and high humidity environments, effectively resists material shrinkage and deformation caused by humid and hot environments, and can adapt to adverse usage environments. When the polarizer is provided with teeth 50, the teeth 50 can evenly distribute the shrinkage stress caused by temperature and humidity changes, avoiding the initiation of cracks caused by local stress concentration. When the absorption axis of the polarizer is parallel to the bonding area, thermal expansion matching is further optimized, suppressing interlayer peeling and interface failure of the display panel. In summary, the display panel can maintain good function, and the probability of problems such as cracks, black spots, and bubbles is low, thereby extending the service life of the display panel.

[0075] According to the embodiment of this application, the display panel has a preset distance greater than or equal to 200μm.

[0076] Understandably, on the one hand, a preset distance greater than or equal to 200μm can isolate the path of polarization layer shrinkage stress to CVD encapsulation layer, significantly reducing the risk of peeling caused by stress transmission. On the other hand, this preset distance allows the polarizer to achieve the above effect even with certain processing errors. At the same time, this preset distance can also meet the narrow bezel process requirements of the display screen.

[0077] For example, the preset distance can be 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, 260μm, 270μm, 280μm, 290μm, 300μm, 310μm, 320μm, 330μm, 340μm, 350μm, 360μm, 370μm, 380μm, and 390μm, etc.

[0078] According to embodiments of the present application, the non-display area of ​​the display panel further includes a bonding area, which is located on the side of the dam area away from the display area, and the absorption axis of the polarizer is parallel to the long side of the bonding area. It is understood that the bonding area typically has high-density metal wiring and solder joints.

[0079] The display device according to the embodiments of this application includes the display panel described above.

[0080] The display device according to the embodiments of this application, due to the presence of the aforementioned display panel, is not sensitive to high temperature and high humidity environments, effectively resists material shrinkage and deformation caused by humid and hot environments, can adapt to adverse usage environments, can evenly distribute the shrinkage stress caused by temperature and humidity changes, avoids crack initiation caused by local stress concentration, and effectively suppresses interlayer peeling and interface failure of the display panel. In summary, the display device can maintain good function, with a low probability of problems such as cracks, black spots, and bubbles, thereby extending the service life of the display device.

[0081] At least one embodiment of this disclosure provides a display device, which may include the display panel described in the above embodiments. For example, the display device may include a touch structure, an optical film (e.g., a microlens, a polarizer), a cover plate, and other structures disposed on the light-emitting side of the display panel.

[0082] More specifically, the display device can be any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, navigator, medical imaging equipment, or in-vehicle display device.

[0083] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also indicate the inclusion of the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0084] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0085] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polarizer, characterized in that, The polarizer comprises a pressure-sensitive adhesive layer, a first protective layer, a polarizing layer, and a second protective layer, stacked sequentially along the thickness direction of the polarizer. The polarizing layer includes a functional area and a sealant. The sealant is disposed circumferentially around the functional area and includes an inner and outer peripheral wall along the radial direction of the functional area. The inner peripheral wall of the sealant is attached to the side peripheral wall of the functional area. The thickness of the sealant is the same as the thickness of the functional area in the thickness direction of the polarizer. The sealant is attached to both the first and second protective layers on both sides. The outer peripheral wall of the sealant is aligned with the outer peripheral walls of the pressure-sensitive adhesive layer, the first protective layer, and the second protective layer in the thickness direction of the polarizer. The outer peripheral contour defined by the pressure-sensitive adhesive layer, the first protective layer, the polarizing layer, and the second protective layer includes a plurality of protruding teeth. The tooth height of the teeth is perpendicular to the thickness direction of the polarizer.

2. The polarizer according to claim 1, characterized in that, The teeth include one of the following shapes: triangular, trapezoidal, and arc-shaped.

3. The polarizer according to claim 1 or 2, characterized in that, The inner and outer peripheral walls of the sealant have the same outline shape as the functional area.

4. A polarizing film substrate for processing the polarizing film as described in any one of claims 1-3, characterized in that, The polarizing layer of the polarizing film includes multiple arrays of functional regions. Each functional region is surrounded by a filling area in the lateral direction. There is a gap between two adjacent filling areas, and the filling area is filled with sealant.

5. The polarizing film substrate according to claim 4, characterized in that, The plurality of functional areas are arranged in a directional array with a first direction as the row. The center position of the functional area in any row is projected onto the first direction, and the center positions of two functional areas in an adjacent row that are adjacent to the functional area are between the projected onto the first direction.

6. A method for preparing a polarizing film substrate as described in claim 4 or 5, characterized in that, include: A polarization layer is composited on one side surface of the first protective layer; The polarization layer is etched to form multiple arrays of functional areas and a filling area pattern surrounding each functional area; Fill the filling area with sealant and cure the filled sealant; A second protective layer is then bonded onto the polarizing layer after the sealant has cured; A pressure-sensitive adhesive is applied to the other side of the first protective layer to form a pressure-sensitive adhesive layer.

7. A display panel, characterized in that, The device includes a substrate and a polarizer as described in any one of claims 1-3, the polarizer being attached to the surface of the substrate, the substrate including a display area and a non-display area disposed outside the display area, the non-display area including dam areas sequentially disposed outward from the display area, the dam area including at least one dam extending along the boundary of the display area, the edge of the polarizer being projected in the thickness direction of the substrate onto the outermost dam, and a predetermined distance between the edge of the polarizer and the outer boundary of the dam.

8. The display panel according to claim 7, characterized in that, The preset distance is greater than or equal to 200μm.

9. The display panel according to claim 7, characterized in that, The non-display area also includes a bonding area located on the side of the dam area away from the display area, and the absorption axis of the polarizer is parallel to the long side of the bonding area.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 7-9.

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