A display module, a display device and a preparation method of the display module

Abstract

This invention relates to the field of display technology, and particularly to a display module, a display device, and a method for manufacturing the display module. The display module includes a display panel, a polarizer, and a protective layer; the display panel includes a substrate and light-emitting devices; the polarizer is disposed in the light-emitting direction of the display panel; the protective layer is disposed on the same layer as the polarizer; wherein the orthographic projection of the polarizer onto the substrate at least partially overlaps with the orthographic projection of the protective layer onto the substrate. Through the above method, this invention can reduce the probability of corrosion on the bottom bezel of the display device.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display module, a display device, and a method for manufacturing the display module. Background Technology

[0002] With the development of science and technology, OLED (Organic Light-emitting Diode) displays are being used more and more widely in display devices such as smartphones, tablets, and laptops. However, currently, OLED displays are experiencing defects such as black spots, S-shaped bright lines, and bubbles on the bottom bezel. Summary of the Invention

[0003] The main technical problem solved by this invention is to provide a display module, a display device, and a method for manufacturing the display module, which can reduce the probability of the above-mentioned defects appearing on the bottom bezel of the display device.

[0004] To address the aforementioned technical problems, one technical solution adopted by the present invention is to provide a display module, including a display panel, a polarizer, and a protective layer; the display panel includes a substrate and light-emitting devices; the polarizer is located in the light-emitting direction of the display panel; the protective layer is disposed on the same layer as the polarizer; wherein the orthographic projection of the polarizer on the substrate and the orthographic projection of the protective layer on the substrate at least partially overlap. This arrangement enhances the protection of the display panel in the bezel area, preventing corrosion from moisture and oxygen.

[0005] In one embodiment, the length of the overlapping area between the orthographic projection of the polarizer on the substrate and the orthographic projection of the protective layer on the substrate is 100-200 μm. This ensures that the protective layer is long enough so that even if the polarizer shrinks, the display panel remains protected by the protective layer, thereby improving adverse reactions such as corrosion of the bottom bezel of the display device.

[0006] In one embodiment, one end of the protective layer is stacked with one end of the polarizer to form a stacked region. In the stacked region, the protective layer is closer to the substrate than the polarizer, and the total thickness of the stacked region is less than or equal to the thickness of the polarizer.

[0007] In one embodiment, the thickness of the protective layer gradually decreases in the stacked region along the direction from the non-display area to the display area of ​​the display module. This arrangement allows for a smoother transition between film layers, improving stress buffering effect.

[0008] In one embodiment, in the stacked region, the protective layer includes a first patterned structure on the side near the polarizer, and the polarizer includes a second patterned structure nested and cooperating with the first patterned structure on the side near the protective layer. This arrangement enhances the bonding force between the polarizer and the protective layer, reduces the pulling force on the display panel, and prevents bubbling from occurring on the bottom bezel of the display device.

[0009] In one embodiment, the display panel further includes a cover plate and an optical adhesive layer located between the polarizer and the cover plate for bonding the polarizer and the cover plate. The high adhesion, low curing shrinkage, strong water and high temperature resistance, and excellent bonding step-filling performance of the optical adhesive layer improve the reliability of the display module.

[0010] In one embodiment, an optical adhesive layer covers the polarizer and the laminated area. By increasing the contact area between the optical adhesive layer and the laminated area, as well as the polarizer, the waterproof encapsulation effect of the polarizer and the protective layer is enhanced. This prevents moisture from penetrating the underside of the display panel, thereby reducing the likelihood of corrosion on the bottom bezel of the display device.

[0011] In one embodiment, the protective layer includes a curved protective layer disposed on the outer side of the display panel along the bending direction to protect the display panel.

[0012] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a display device, including a display module as described in any of the above embodiments.

[0013] To address the aforementioned technical problems, another technical solution adopted by the present invention is to provide a method for fabricating a display module. The method includes: providing a display panel, the display panel comprising a substrate and light-emitting devices; forming a polarizer and a protective layer on the display panel, the polarizer being located in the light-emitting direction of the display panel; the protective layer being disposed on the same layer as the polarizer; wherein the orthographic projection of the polarizer onto the substrate at least partially overlaps with the orthographic projection of the protective layer onto the substrate. This arrangement enhances the protection of the display panel in the bezel area, preventing corrosion by moisture and oxygen.

[0014] In one embodiment, forming a polarizer and a protective layer on a display panel includes: first forming a protective layer on the display panel, the protective layer extending to the display area, the thickness of the protective layer in the display area being less than the thickness of the protective layer in the non-display area; then forming a polarizer in the display area, the polarizer covering the protective layer in the display area.

[0015] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention discloses a display module, a display device, and a method for manufacturing the display module. The display module includes a display panel, a polarizer, and a protective layer; the display panel includes a substrate and light-emitting devices; the polarizer is disposed in the light-emitting direction of the display panel; the protective layer is disposed on the same layer as the polarizer; wherein the orthographic projection of the polarizer on the substrate at least partially overlaps with the orthographic projection of the protective layer on the substrate. Through the above methods, this invention can reduce the probability of corrosion on the bottom bezel of the display device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0017] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the display module of the present invention;

[0018] Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the display module of the present invention;

[0019] Figure 3 This is a cross-sectional structural diagram of one embodiment of the display module of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Currently, corrosion of the bottom bezel in OLED displays remains a significant issue. During their long-term research and development, the inventors of this application discovered that the root cause lies in two main factors. First, the inorganic encapsulation layer in the non-display area of ​​the bottom bezel is relatively thin, resulting in a weak ability to block moisture and oxygen. Especially during high-temperature and high-humidity reliability testing, moisture and elements such as iodine, potassium, or sulfur from the polarizer can penetrate downwards into the display panel, reacting chemically with the metal layers and causing circuit corrosion. Second, the polarizer shrinks upon heating, exposing the display panel. This exposed panel is more susceptible to moisture intrusion, leading to corrosion and consequently, defects such as black spots, S-shaped bright lines, and blistering on the bottom bezel.

[0022] Therefore, this invention proposes a novel display module stacking design scheme, which improves and optimizes the structure of the display module, ultimately reducing the probability of corrosion of the display panel. The various embodiments of the display module will be described below with reference to the accompanying drawings.

[0023] Please see Figure 1 , Figure 1 This is a cross-sectional structural diagram of one embodiment of the display module of the present invention. In this embodiment, the display module includes a display panel 10, a polarizer 12, and a protective layer 11.

[0024] The display panel 10 includes a display area AA and a non-display area NAA surrounding the display area AA. The display area AA is specifically the part that emits light for display, and the non-display area NAA is the part used to set up peripheral circuits.

[0025] Specifically, the display panel 10 includes a substrate and a light-emitting device. The display panel 10 can be any of the following: an organic light-emitting diode (OLED) display panel, a QLED (quantum dot light-emitting diode) display panel, or a micro LED display panel; this invention does not specifically limit this. The light-emitting mode of the display panel 10 can be top-emitting or bottom-emitting.

[0026] The polarizer 12 is located in the light-emitting direction of the display panel 10.

[0027] Specifically, the polarizer 12 covers the display panel 10 and is located in the light-emitting direction of the display panel. The material of the polarizer 12 can be materials such as PE (polyethylene), PVA (polyvinyl alcohol), or TAC (cellulose triacetate). Preferably, PVA (polyvinyl alcohol) is used as the material of the polarizer 12. PVA (polyvinyl alcohol) has the characteristics of high transparency, high ductility, good iodine adsorption, and good film-forming properties.

[0028] The protective layer 11 is set in the same layer as the polarizer 12.

[0029] Specifically, the protective layer 11 is disposed in the non-display area NAA, and a portion of the protective layer 11 may extend into the display area AA.

[0030] The polarizer 12's orthogonal projection on the substrate and the protective layer 11's orthogonal projection on the substrate at least partially overlap.

[0031] For example, please refer to Figure 1 At least a portion of the protective layer 11 extends below the polarizer 12, meaning the protective layer 11 and the polarizer 12 can overlap. By ensuring that the orthographic projection of the polarizer 12 on the substrate at least partially overlaps with the orthographic projection of the protective layer 11 on the substrate, the display panel 10 can still be protected by the protective layer 11 even after the polarizer 12 shrinks. This significantly reduces the likelihood of corrosion of the display panel 10 and improves adverse reactions such as corrosion caused by moisture intrusion to the lower bezel of the display device. Furthermore, the protective layer 11 can be made of a waterproof and flexible material.

[0032] In one embodiment, the length of the overlapping area between the orthographic projection of the polarizer 12 on the substrate and the orthographic projection of the protective layer 11 on the substrate is 100-200 μm.

[0033] Specifically, the length of the overlapping area between the orthographic projection of the polarizer 12 on the substrate and the orthographic projection of the protective layer 11 on the substrate is 100-200 μm. This 100-200 μm overlap further ensures that the protective layer 11 is sufficiently long, so that even if the polarizer 12 shrinks, the display panel 10 remains protected by the protective layer 11, thereby mitigating adverse reactions such as corrosion of the lower bezel of the display device.

[0034] Please see Figure 2 , Figure 2 This is a cross-sectional structural diagram of one embodiment of the display module of the present invention. In this embodiment, one end of the protective layer 11 is stacked with one end of the polarizer 12 to form a stacked region 20. In the stacked region 20, the protective layer 11 is closer to the substrate than the polarizer 12, and the total thickness of the stacked region 20 is less than or equal to the thickness of the polarizer 12. It can be understood that the total thickness of the stacked region 20 is less than or equal to the thickness of the polarizer 12 excluding the stacked region 20.

[0035] Specifically, such as Figure 2 In the region covered by the intermediate stacked region 20, one end of the protective layer 11 is stacked with one end of the polarizer 12 to achieve overlap between the orthographic projection of the polarizer 12 on the substrate and the orthographic projection of the protective layer 11 on the substrate, and the protective layer 11 is closer to the substrate or display panel 10 than the polarizer 12. With this arrangement, when the polarizer is heated and deformed, the display panel will not be damaged, and the protective layer will protect the display panel after deformation. Furthermore, it will not increase the total thickness of the display panel, ensuring film flatness.

[0036] In one embodiment, the thickness of the protective layer 11 in the stacked region 20 gradually decreases along the direction from the non-display area NAA to the display area AA. This makes the total thickness of the stacked region 20 less than or equal to the thickness of the polarizer 12. This arrangement allows for a smoother transition between the film layers, improving stress buffering capability without affecting the optical effect of the polarizer.

[0037] Please see Figure 3 , Figure 3 This is a cross-sectional structural schematic diagram of one embodiment of the display module of the present invention. In this embodiment, in the stacked region 20, the protective layer 11 includes a first patterned structure 31 on the side near the polarizer 12, and the polarizer 12 includes a second patterned structure 32 nested and cooperating with the first patterned structure 31 on the side near the protective layer 11. That is, the first patterned structure 31 and the second patterned structure 32 can be patterned structures capable of forming a nested fit. For example, the first patterned structure 31 can be a protruding shape, and the second patterned structure 32 can be a groove capable of being embedded in the protrusion.

[0038] In this embodiment, the polarizer 12 and the protective layer 11 can be formed into corresponding patterned structures through an exposure process, which most easily forms protrusions or grooves with trapezoidal cross-sections. This simplifies the fabrication process and reduces production costs.

[0039] It should be noted that the first graphic structure 31 and the second graphic structure 32 can be other shapes that can be nested and matched. This application does not specifically limit the shapes of the first graphic structure 31 and the second graphic structure 32.

[0040] By forming a first patterned structure 31 on the side of the protective layer 11 near the polarizer 12, and including a second patterned structure 32 nested with the first patterned structure 31 on the side of the polarizer 12 near the protective layer 11, the polarizer 12 and the protective layer 11 form a nested fit, enhancing the bonding force between them. This arrangement reduces the shrinkage distance of the polarizer 12 when it contracts, or in other words, the polarizer 12 shifts along with the protective layer 11 during contraction, thus reducing the amount of shrinkage. Simultaneously, the buffer provided by the protective layer 11 also reduces the pulling on the display panel 10, preventing bulging of the lower bezel of the display device.

[0041] Furthermore, the complete nesting of the first patterned structure 31 and the second patterned structure 32 ensures that there is no gap between the protective layer 11 and the polarizer 12, further increasing the difficulty for water vapor in the environment to carry corrosive substances volatilized from the polarizer 12 down to the display panel 10, reducing the probability of corrosion on the lower bezel of the display device, and improving the reliability of the display module.

[0042] In one feasible embodiment, the protective layer 11 contains desiccant particles that can absorb moisture that seeps into the display panel 10. This makes it difficult for a small amount of corrosive substances to chemically react with the display panel 10 even if they penetrate the protective layer 11 without the catalysis of moisture, thereby reducing the probability of corrosion on the bottom bezel of the display device.

[0043] In one embodiment, the display panel further includes a cover plate 14 disposed on the side of the polarizer 12 away from the display panel 10. It is attached to the light-emitting direction of the display panel 10 by an optical adhesive layer 13 to protect the display panel 10. The cover plate 14 can be a glass cover plate or a flexible cover plate, such as a polyimide (PI) cover plate.

[0044] Among them, the optical adhesive layer 13 can be OCA (Optically Clear Adhesive), PSA (Pressure Sensitive Adhesive), etc. The optical adhesive material has high adhesion, low curing shrinkage, strong water resistance and high temperature resistance, and excellent bonding step filling properties.

[0045] In one embodiment, the optical adhesive layer 13 covers the polarizer 12 and the stacked region 20, with the polarizer 12 and the stacked region 20 embedded within the optical adhesive layer 13. That is, optical adhesive material is applied around the polarizer 12 and the stacked region 20. The periphery of the optical adhesive material can extend slightly beyond the periphery of the stacked region 20 into the non-display area (NAA), or it can be flush with the periphery of the stacked region 20. By increasing the contact area between the optical adhesive layer 13 and the stacked region 20 and the polarizer 12, the waterproof encapsulation effect of the polarizer 12 and the protective layer 11 is enhanced. This prevents moisture from penetrating the underside of the display panel 10, reducing the likelihood of corrosion on the bottom bezel of the display panel 10, thereby improving the reliability of the display module.

[0046] Please continue reading. Figure 2 The non-display area (NAA) includes both the bent and non-bent areas.

[0047] The protective layer 11 includes a curved protective layer, also known as a bending protection layer (BPL), which is disposed on the outer side of the display panel 10 along the bending direction. The bending direction is specifically as follows... Figure 2 The direction of arrow 24 shown. Since the protective layer 11 serves a protective function and needs to be bent, a waterproof and flexible material can be selected, such as at least one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyether sulfone (PES), and polyimide (PI).

[0048] In summary, the length of the overlapping area between the orthographic projection of the polarizer 12 on the substrate and the orthographic projection of the protective layer 11 on the substrate of the display panel 10 is 100-200 μm. With the above-described structure, even if the polarizer 12 shrinks in a high-temperature and high-humidity environment, the corresponding area of ​​the display panel 10 within the shrinkage range of the polarizer 12 remains protected by the protective layer 11. The protective layer 11 prevents moisture in the environment from carrying iodine, potassium, or sulfur elements volatilized from the polarizer down to the display panel 10. Furthermore, the use of a water-resistant material in the protective layer 11 increases the difficulty for moisture in the environment to carry corrosive substances volatilized from the polarizer 12 down to the display panel 10, thereby reducing the probability of corrosion on the lower bezel of the display device.

[0049] In one feasible embodiment, an isolation layer can be provided on the surface of the polarizer 12 to isolate water vapor, oxygen and iodine ions generated by the polarizer 12, thereby preventing the iodine ions generated by the polarizer 12 from penetrating into the display panel 10 and further reducing the probability of corrosion of the lower bezel of the display panel 10.

[0050] In one embodiment, the display module provided by the present invention can be applied to a display device, such as a mobile phone, tablet computer, smart wearable product (smartwatch, bracelet), personal digital assistant (PDA), in-vehicle computer, or other mobile or fixed terminal with a display module. This application does not impose any special limitations on the specific form of the aforementioned display device.

[0051] To achieve the above structure, the present invention also provides a method for manufacturing a display module. First, a protective layer is prepared, and then a polarizer is attached. This method only changes the order of polarizer attachment in the existing display module process, without increasing the process difficulty, and achieves at least partial overlap between the orthogonal projection of the polarizer on the substrate and the orthogonal projection of the protective layer on the substrate. This improves the situation where the polarizer 12 shrinks and exposes the display panel 10 in high-temperature and high-humidity environments, reducing the probability of corrosion of the lower bezel of the display device. The display module manufacturing method provided by the embodiments of the present invention includes:

[0052] S101: Provides a display panel.

[0053] Specifically, a display panel includes a substrate and light-emitting devices.

[0054] S102: Form a protective layer on the display panel.

[0055] Specifically, the material for preparing the protective layer 11 is first coated onto the surface of the display panel 10, and left to stand for a period of time to allow the material for preparing the protective layer 11 to naturally level out and form a layer like... Figure 2 The slope structure shown. Alternatively, etching can be used, which is not limited here.

[0056] S103: A polarizer is formed on the display panel.

[0057] An adhesive layer can be applied to the surface of the display area AA of the display panel 10, and the polarizer 12 can be attached to the display panel 10.

[0058] The protective layer 11 is disposed in the non-display area NAA and extends to the display area AA. The thickness of the protective layer 11 in the display area AA is less than the thickness of the protective layer 11 in the non-display area NAA. The protective layer 11 and the polarizer 12 are disposed in the same layer, and both the protective layer 11 and the polarizer 12 are located in the light emission direction of the display panel. The orthographic projection of the polarizer 12 on the substrate and the orthographic projection of the protective layer 11 on the substrate at least partially overlap. The polarizer 12 covers the protective layer 11 located in the display area AA.

[0059] In another embodiment, the polarizer 12 is cut to correspond with the first patterned structure 31, so that the end of the polarizer 12 near the non-display area NAA forms a second patterned structure 32 that cooperates with the first patterned structure 31. The polarizer 12 is then bonded to the protective layer 11. The polarizer 12 and the protective layer 11 can be bonded manually or automatically using equipment; this application does not limit the bonding method.

[0060] S104: Attach the cover plate to the polarizer.

[0061] Photoresist is coated on the side of the polarizer 12 away from the display panel 10 to form an optical adhesive layer 13. The cover plate 14 is bonded to the polarizer 12 through the optical adhesive layer 13 to complete the fabrication of the display module.

[0062] This application changes the existing display module manufacturing process by first preparing the protective layer 11 and then attaching the polarizer 12. No additional manufacturing process is required. By simply changing the attachment steps of the protective layer 11 and the polarizer 12, the stacked structure of the polarizer and the protective layer in the display module can be achieved, thereby improving the corrosion problem of the lower frame of the display device caused by moisture intrusion.

[0063] Please refer to Table 1, which shows the results of the TTF480H test conducted on existing display modules and the display module of this invention. The experimental sample of the display modules consisted of 32 groups, and the high-temperature and high-humidity reliability test conditions were: temperature 85 degrees Celsius, humidity 85%, and test duration 480 hours.

[0064]

[0065] Please refer to Table 2, which shows the results of ball drop tests conducted on existing display modules and the display module of this invention. The experimental sample size for the display module is 10 groups.

[0066]

[0067] As shown in Table 1, in the high-temperature and high-humidity reliability test, the bottom bezel of the existing display module (Comparative Example 1) exhibits corrosion, and the rate of defects such as black spots, S-shaped bright lines, and bulging on the bottom bezel is 31%. In contrast, the display module of this invention (Experimental Example 1) shows no corrosion on the bottom bezel in the high-temperature and high-humidity reliability test, demonstrating excellent quality. Therefore, the display module of this invention can reduce the probability of corrosion on the bottom bezel of the display device. Furthermore, as shown in Table 2, in the ball drop test, the display module of this invention, tested at a height of 62.5 cm, did not exhibit any defects such as black spots, S-shaped bright lines, or bulging on the bottom bezel.

[0068] In summary, this invention discloses a display module, a display device, and a method for manufacturing the display module. By setting a protective layer in the non-display area (NAA) of the display panel 10, and ensuring that the orthogonal projection of the polarizer 12 on the substrate at least partially overlaps with the orthogonal projection of the protective layer 11 on the substrate, the display module with the above structure, even after high-temperature and high-humidity reliability testing, remains covered by the protective layer 11 even if the polarizer 12 shrinks. The protective layer 11 hinders the penetration of moisture from the environment, carrying iodine, potassium, or sulfur elements volatilized from the polarizer, into the display panel 10. Furthermore, the use of a water-resistant material in the protective layer 11 increases the difficulty for moisture in the environment to carry corrosive substances volatilized from the polarizer 12 into the display panel 10, thereby reducing the probability of corrosion on the bottom bezel of the display device. Moreover, by simply changing the attachment steps of the protective layer 11 and the polarizer 12, a stacked structure of the polarizer 12 and the protective layer 11 in the display module can be achieved, improving the corrosion problem of the bottom bezel of the display device caused by moisture intrusion. The manufacturing process is simple and also reduces costs.

[0069] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this invention.

Claims

1. A display module, characterized in that, include: Display panel, including substrate and light-emitting device; A polarizer is located in the light-emitting direction of the display panel; A protective layer is disposed in the same layer as the polarizer; the protective layer is disposed in the non-display area of ​​the display panel, and a portion of the protective layer extends into the display area of ​​the display panel; Wherein, the orthographic projection of the polarizer on the substrate and the orthographic projection of the protective layer on the substrate at least partially overlap, and the polarizer covers the protective layer located in the display area; The length of the overlapping area between the orthographic projection of the polarizer on the substrate and the orthographic projection of the protective layer on the substrate is 100μm-200μm. One end of the protective layer is stacked with one end of the polarizer to form a stacked region. In the stacked region, the protective layer is closer to the substrate than the polarizer, and the total thickness of the stacked region is less than or equal to the thickness of the polarizer.

2. The display module according to claim 1, characterized in that, Along the direction from the non-display area to the display area, the thickness of the protective layer in the stacked area gradually decreases.

3. The display module according to claim 1, characterized in that, In the stacked region, the protective layer includes a first patterned structure on the side near the polarizer, and the polarizer includes a second patterned structure nested and cooperating with the first patterned structure on the side near the protective layer.

4. The display module according to claim 1, characterized in that, The display panel further includes a cover plate and an optical adhesive layer located between the polarizer and the cover plate for bonding the polarizer and the cover plate, the optical adhesive layer covering the polarizer and the stacked area.

5. The display module according to claim 1, characterized in that, The protective layer includes a curved protective layer disposed on the outer side of the display panel along the bending direction.

6. A display device, characterized in that, Includes the display module as described in any one of claims 1-5.

7. A method for manufacturing a display module, characterized in that, include: A display panel is provided, the display panel including a substrate and light-emitting devices; A polarizer and a protective layer are formed on the display panel, wherein the polarizer is located in the light emission direction of the display panel; the protective layer is disposed in the same layer as the polarizer. Wherein, the orthographic projection of the polarizer on the substrate and the orthographic projection of the protective layer on the substrate at least partially overlap; the length of the overlapping area of ​​the orthographic projection of the polarizer on the substrate and the orthographic projection of the protective layer on the substrate is 100μm-200μm; one end of the protective layer and one end of the polarizer are stacked to form a stacked area, wherein the protective layer is closer to the substrate than the polarizer in the stacked area, and the total thickness of the stacked area is less than or equal to the thickness of the polarizer. The formation of the polarizer and protective layer on the display panel includes: First, the protective layer is formed on the display panel, the protective layer extends to the display area, and the thickness of the protective layer located in the display area is less than the thickness of the protective layer located in the non-display area; The polarizer is then formed in the display area, and the polarizer covers the protective layer located in the display area.

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