WO2021068667A1

WO2021068667A1 - Display screen assembly and mobile terminal

Info

Publication number: WO2021068667A1
Application number: PCT/CN2020/111321
Authority: WO
Inventors: 罗建红; 尹帮实; 李瑞峰; 严斌
Original assignee: 华为技术有限公司
Priority date: 2019-10-09
Filing date: 2020-08-26
Publication date: 2021-04-15
Also published as: CN110853496B; CN110853496A

Abstract

Provided is a display screen assembly, comprising a display screen (1), an adhesive layer (2) and a screen cover plate (3), wherein the adhesive layer (2) is adhered between the display screen (1) and the screen cover plate (3); and the screen cover plate (3) comprises a composite board layer (311). The composite board layer (311) comprises at least two layers, and the material of the composite board layer (311) comprises at least two types of amorphous crystalline polymers, so as to improve the strength and hardness of the screen cover plate (3), such that the screen cover plate (3) can effectively protect the display screen, and the risk of the screen cover plate (3) being broken due to falling or a collision is reduced. Further provided is a mobile terminal comprising the display screen assembly.

Description

Display assembly and mobile terminal

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910955116.3, and the application name is "display assembly and mobile terminal" on October 9, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of terminal technology, and in particular to a display screen assembly and a mobile terminal.

Background technique

With the continuous progress of society, mobile phones and other terminal devices have become one of the indispensable products in people's lives. At present, in order to improve the beauty and feel of the mobile terminal, a cover made of glass is mostly used to protect the display screen of the mobile terminal. However, due to the low fracture toughness and flexural strength of the glass cover plate, it is easily broken due to falling or bumping, which affects the reliability of the product.

Summary of the invention

The present application provides a display screen assembly and a mobile terminal, which are used to improve the reliability of the screen cover, reduce the risk of the screen cover being broken due to a drop or collision, and improve the aesthetics of the product.

The display screen assembly of the present application includes a display screen, an adhesive layer and a screen cover plate, the adhesive layer is bonded between the display screen and the screen cover plate, and the screen cover plate includes a composite sheet layer, The composite sheet layer includes at least two layers, and the material of the composite sheet layer includes at least two amorphous crystalline polymers to improve the strength and hardness of the screen cover.

In the display screen assembly of the present application, the screen cover includes the composite sheet layer, and the composite sheet layer includes at least two amorphous crystalline polymers, so that the screen cover not only has better light transmittance , Does not affect the display effect of the display screen, and has good strength and hardness, can effectively protect the display screen, reduce the risk of the screen cover being broken due to falling or collision, and improve the aesthetics of the product.

In one embodiment, the composite sheet layer includes a first layer and a second layer that are stacked, and the material of the first layer includes polycarbonate, cycloolefin polymer or polycycloolefin copolymer, polycarbonate, Cycloolefin polymers or polycyclic olefin copolymers are both transparent materials and have good flexibility, which can not only increase the light transmittance of the screen cover, but also facilitate the attachment of the screen cover to the display screen. In combination, the material of the second layer includes polymethyl methacrylate, which is a light-transmitting material, which is beneficial to improve the light-transmitting property of the screen cover.

In one embodiment, the thickness of the first layer is between 0.2 mm and 1 mm, so as to ensure that the first layer has good toughness and rigidity, and to improve the toughness and rigidity of the screen cover.

In one embodiment, the thickness of the second layer is between 0.05 mm and 0.5 mm to ensure the shape stability of the second layer and to ensure that the second layer has good toughness, hardness and rigidity , Improve the toughness, hardness and rigidity of the screen cover.

In one embodiment, the thickness of the screen cover is equal to or greater than 0.7 mm, so as to ensure the rigidity of the screen cover and improve the protective effect of the screen cover on the display screen.

In one embodiment, the hardness of the first layer is equal to or greater than 1H, which not only improves the rigidity of the screen cover, but also reduces the risk of scratching the first layer during the production process of the screen cover. Improve the display quality of the display screen assembly.

In one embodiment, the birefringence of the first layer is less than 0.8, so as to reduce the anisotropy of the first layer, improve the uniformity of the first layer, and reduce the alignment of the screen cover. Describes the influence of the display on the display.

In one embodiment, the composite sheet layer further includes a third layer provided on the surface of the first layer facing away from the second layer, and the material of the third layer includes polymethacrylic acid Methyl ester.

In one embodiment, the screen cover further includes a first hardened layer laminated on the surface of the composite sheet layer facing away from the display screen to increase the hardness of the outer surface of the screen cover , To improve the protective effect of the screen cover on the display screen.

In one embodiment, the hardness of the first hardened layer is equal to or greater than 7H to ensure the surface hardness of the screen cover.

In one embodiment, the thickness of the first hardened layer is between 10 μm and 30 μm, so that the first hardened layer can better adhere to the surface of the composite sheet layer away from the display screen to effectively Improve the hardness of the screen cover.

In one embodiment, the first hardened layer includes a first sub-hardened layer and a second sub-hardened layer that are stacked, and the second sub-hardened layer is completely attached to the first sub-hardened layer, that is, the The first hardened layer is formed by two curtain coating processes to further increase the hardness of the outer surface of the screen cover.

In one embodiment, the first sub-hardened layer does not contain fluorine-containing resin, so as to increase the specific surface energy of the first sub-hardened layer, so that the second sub-hardened layer can better adhere to the first sub-hardened layer. On the sub-hardened layer, the second sub-hardened layer and the first sub-hardened layer are seamlessly connected to improve the bonding force between the second sub-hardened layer and the first sub-hardened layer.

In one embodiment, the second sub-hardened layer includes a fluorine-containing resin to reduce the specific surface energy of the second sub-hardened layer, improve the self-cleaning function of the second sub-hardened layer, and further improve the Self-cleaning function of the screen cover.

In one embodiment, the screen cover further includes a second hardened layer laminated on the surface of the composite sheet layer facing the display screen to increase the hardness of the inner surface of the screen cover , Reduce the risk of scratching the composite sheet layer during the preparation process of the screen cover, and improve the display quality of the display screen assembly.

In one embodiment, the thickness of the second hardened layer is between 2 μm and 15 μm to ensure that the second hardened layer has good hardness and optical properties.

In one embodiment, the screen cover is a 3D cover to improve the appearance of the display screen assembly.

In one embodiment, the screen cover includes an inner surface facing the display screen, a side surface disposed opposite to the inner surface and connected between the inner surface and the outer surface, and the inner surface includes A flat middle area and an arc-shaped edge area. The side surface includes a first sub-side surface. The first sub-side surface surrounds the edge of the inner surface and is parallel to the middle area to reduce the middle frame and the The mating depth of the screen cover improves the rigidity of the middle frame.

In an embodiment, in the direction from the inner surface to the outer surface, the size of the first sub-side surface is equal to or greater than one-half of the thickness of the screen cover to increase the screen cover The bonding surface of the board and the middle frame improves the bonding firmness between the screen cover and the middle frame.

In one embodiment, the display screen assembly further includes an ink layer covering a part of the edge area away from the middle area and the side surface, so that the ink layer covering the side surface is partially The bending direction of the edge area presents a narrowing visual effect, which is equivalent to reducing the display black border of the display screen assembly in terms of the visual effect, and improving the aesthetics of the display screen assembly.

The mobile terminal described in the present application includes a middle frame and any one of the above-mentioned display screen components, and the screen cover is installed on the middle frame.

In the mobile terminal of the present application, the screen cover includes a first layer and a second layer, the material of the first layer includes polycarbonate, and the material of the second layer includes polymethylmethacrylate, poly Carbonate and polymethyl methacrylate are both amorphous crystalline polymers. The screen cover not only has good light transmittance, does not affect the display effect of the display screen, but also has good strength and hardness. The display screen can be effectively protected, the risk of the screen cover being broken due to falling or collision is reduced, and the aesthetics of the mobile terminal is improved.

In one embodiment, the middle frame includes a mounting surface facing the display screen assembly, the mounting surface is provided with a limiting groove, and the screen cover is installed in the limiting groove. The limiting slot limits the screen cover, prevents the screen cover from expanding and deforming after being pressed, improves the pressing ability and stiffness of the screen cover, and improves the user experience.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the following will describe the drawings that need to be used in the embodiments of the present application or the background art.

FIG. 1 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present application;

2 is a schematic cross-sectional structure diagram of the mobile terminal shown in FIG. 1 along the A-A direction;

3 is a schematic diagram of a partially exploded structure of a display screen assembly in the mobile terminal shown in FIG. 1;

FIG. 4 is a detailed structural schematic diagram of a screen cover in an embodiment of the mobile terminal shown in FIG. 2; FIG.

FIG. 5 is a detailed structural diagram of the screen cover in another embodiment of the mobile terminal shown in FIG. 2; FIG.

FIG. 6 is a detailed structural diagram of the screen cover in the mobile terminal shown in FIG. 2 in a third embodiment;

FIG. 7 is a detailed structural diagram of the screen cover in the mobile terminal shown in FIG. 2 in a fourth implementation manner.

Detailed ways

The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

Please refer to Figure 1 and Figure 2. FIG. 1 is a schematic structural diagram of a mobile terminal 100 provided by an embodiment of the present application. FIG. 2 is a schematic cross-sectional structure diagram of the mobile terminal 100 shown in FIG. 1 along the A-A direction.

The mobile terminal 100 may be a mobile terminal with a display function, such as a mobile phone, a tablet computer, a multimedia player, an e-book reader, a notebook computer, a vehicle-mounted device, or a wearable device. In the embodiment shown in FIG. 1, the mobile terminal 100 is a mobile phone as an example for description.

The mobile terminal 100 includes a housing 10, a display screen assembly 20, and a control module 30. The display screen assembly 20 is installed on the casing 10, and the control module 30 is housed in the casing 10 and is electrically connected to the display screen assembly 20 to control the display of the display screen assembly 20.

The housing 10 includes a middle frame 11 and a rear cover 12. The back cover 12 has a flat plate-like structure, and the middle frame 11 is located on the side of the back cover 12 facing the display screen assembly 20. In this embodiment, the middle frame 11 and the back cover 12 are integrally formed to increase the structural compactness of the mobile terminal 100 and prevent the back cover 12 from being easily detached when the mobile terminal 100 is dropped, which may cause the electronics in the mobile terminal 100 The components are dropped and damaged. Among them, the materials of the middle frame 11 and the back cover 12 include, but are not limited to, engineering plastics such as PC (Polycarbonate), ABS (Acrylonitrile Butadiene Styrene copolymers, acrylonitrile-butadiene-styrene copolymer) or titanium alloys, Aluminum-magnesium alloy, glass or ceramics, etc. Of course, in other embodiments, the middle frame and the back cover may also be an integrated structure formed by assembly, or the middle frame and the back cover are connected in a detachable manner to facilitate Repair or replacement of batteries, memory cards, and circuit boards in the mobile terminal 100.

The middle frame 11 includes a mounting surface 111 facing away from the rear cover 12, and a limiting groove 112 is recessed on the mounting surface 111, and the limiting groove 112 is used to limit the display screen assembly 20. Specifically, the limiting groove 112 is located at the inner edge of the mounting surface 111, and the limiting groove 112 includes a groove bottom surface 113 and a groove side surface 114 connected to the groove bottom surface 113. The groove bottom surface 113 is parallel to the rear cover 12, and the angle between the groove side surface 114 and the mounting surface 111 is equal to or greater than 90 degrees. In one embodiment, the depth of the limiting groove 112 is 0.3 mm-0.45 mm. Compared with the prior art, in the mobile terminal 100 shown in this embodiment, the mating depth of the middle frame 11 and the display screen assembly 20 is smaller, which is beneficial to improve the rigidity of the middle frame 11.

The display screen assembly 20 is fixed in the limiting slot 112. That is, the display screen assembly 20 and the rear cover 12 are respectively installed on both sides of the middle frame 11. When a user uses the mobile terminal 100, the display screen assembly 20 is usually placed toward the user, and the back cover 12 is placed away from the user. The display screen assembly 20 includes a display screen 1, an adhesive layer 2 and a screen cover 3, and the adhesive layer 2 is bonded between the display screen 1 and the screen cover 3.

Please also refer to FIG. 3. FIG. 3 is a partial exploded structure diagram of the display screen assembly 20 in the mobile terminal 100 shown in FIG. 1.

The display screen 1 includes a display surface 101 and a non-display surface 102 disposed opposite to the display surface 101. When a user uses the mobile terminal 100, the display surface 101 is usually set toward the user to display images and provide an interactive interface for the user. In this embodiment, the display screen 1 is a 3D display screen, that is, the display screen 1 is a display screen in which the display surface 101 and the non-display surface 102 are both curved, that is, the display screen 1 is a curved screen with a curved edge. Specifically, the display surface 101 includes a main display area 103 and two sub display areas 104 connected to both sides of the main display area 103. The main display area 103 is located in the middle area of the display surface 101, and the main display area 103 is a flat area. The two sub-display areas 104 are respectively located at the edge area of the display surface 101, and the two sub-display areas 104 are both arc-shaped areas curved and extended along the edge of the main display area 103. In one embodiment, the two sub-display areas 104 have the same size and shape, and are symmetrically distributed on both sides of the main display area 103. In other embodiments, the size and shape of the two secondary display areas may also be different, which is not specifically limited in this embodiment. Of course, in other embodiments, the display screen may also be a 2D display screen, that is, the display screen is a display screen with a flat display surface and a non-display surface, or the display screen may also be a 2.5D display. The display screen is a display screen with a curved display surface and a flat non-display surface, which is not specifically limited in this application.

The screen cover 3 is adhered to the display screen 1 through the adhesive layer 2 and completely covers the display surface 101 to protect the display screen 1 and prevent the display screen 1 from being broken due to falling or bumping. The screen cover 3 includes an inner surface 301, an outer surface 302 and a side surface 303 which are arranged oppositely. In this embodiment, the screen cover 3 is a 3D screen cover adapted to the display screen 1, that is, the screen cover 3 is a cover whose inner surface 301 and outer surface 302 are both curved. Specifically, the inner surface 301 is the surface of the screen cover 3 facing the display screen 1, that is, the adhesive layer 2 is connected between the inner surface 301 and the display surface 101. The inner surface 301 includes a middle area 3011 and edge areas 3012 connected to both sides of the middle area 3011. The middle area 3011 is a flat area and covers the main display area 103. The two edge regions 3012 are arc-shaped regions and respectively cover the two sub-display regions 104. In one embodiment, the two edge regions 3012 have the same size and shape, and are symmetrically distributed on both sides of the middle region 3011. In other embodiments, the size and shape of the two edge regions may also be different, which is not specifically limited in this embodiment. The outer surface 302 is opposite to the inner surface 301, that is, the outer surface 302 is the appearance surface of the screen cover 3. The side surface 303 is connected between the inner surface 301 and the outer surface 302, and the side surface 303 includes a first sub-side 3031 and a second sub-side 3032. The first sub-side surface 3031 is arranged around the edge of the inner surface 301 and is parallel to the middle area 3011, which is beneficial to reduce the depth of the upper limit groove 112 of the middle frame 11 and improve the rigidity of the middle frame 11. In the direction from the inner surface 301 to the outer surface 302, the size of the first sub-side surface 3031 is equal to or greater than one-half of the thickness of the screen cover 3 to increase the installation area between the screen cover 3 and the middle frame 11. Improve the installation stability between the screen cover 3 and the middle frame 11. The second side surface 3032 is arranged around the edge of the outer surface 302 and is connected between the first side surface 3031 and the outer surface 302. In one embodiment, the angle between the second sub-side surface 3032 and the first sub-side surface 3031 is equal to or greater than 90 degrees. Of course, in other embodiments, the screen cover may also be a 2D screen cover adapted to the display screen, that is, the screen cover is a cover whose inner surface and outer surface are both flat, or, The screen cover may also be a 2.5D screen cover, that is, the screen cover is a cover with a flat inner surface and a curved outer surface, which is not specifically limited in this application.

The screen cover 3 is fixed in the limit slot 112 by the fixing glue layer 40, that is, the screen cover 3 is installed in the limit slot 112, and the screen cover 3 cannot drive the display screen 1 to expand and deform laterally after being pressed, which not only improves The anti-pressing ability of the screen cover 3 also improves the stiffness of the display screen 1, which helps to improve the user experience. Specifically, the fixing glue layer 40 includes a first sub fixing glue layer 41 and a second sub fixing glue layer 42. The first sub-fixing adhesive layer 41 is connected between the first sub-side surface 3031 and the groove bottom surface 113. Since the first sub-side surface 3031 and the groove bottom surface 113 shown in this embodiment are both parallel to the rear cover 12, it is equivalent to adding a screen cover. The bonding surface between 3 and the middle frame 11 improves the bonding stability between the screen cover 3 and the middle frame 11. The second sub-fixing glue layer 42 is connected to the first sub-fixing glue layer 41 and connected between the second side surface 3032 and the groove side surface 114.

The display screen assembly 20 further includes an ink layer 4, and the ink layer 4 includes a first sub-ink layer 41 and a second sub-ink layer 42. The first sub-ink layer 41 is provided on the edge of the inner surface 301. The inner edge of the first sub-ink layer 41 defines a perspective area of the screen cover 3, which is used to view the display surface 101 displayed on the display screen 1 when the screen 1 is working from one side of the outer surface 302 of the screen cover 3 information. The second ink sub-layer 42 is disposed on the side surface 303 and covers the side surface 303. According to the optical function, when the second sub-ink layer 42 is viewed from the outside of the screen cover 3, the second sub-ink layer 42 presents a narrowing visual effect in the bending direction of the screen cover 3, which is equivalent to the visual effect. This reduces the black edges of the display screen 1 and improves the aesthetics of the mobile terminal 100. In one embodiment, the ink layer 4 is formed on the screen cover 3 by a silk screen pad printing process.

Please refer to FIG. 4, which is a detailed structural diagram of an embodiment of the screen cover 3 shown in FIG. 2.

The screen cover 3 includes a composite sheet layer 311 and a first hardened layer 312 stacked in sequence. Specifically, the composite sheet layer 311 is provided on the surface of the adhesive layer 2 facing away from the display surface 101, the composite sheet layer 311 includes at least two layers, and the material of the composite sheet layer 311 includes at least two amorphous crystalline polymers to improve the screen cover. The strength and hardness of the board 3.

In one embodiment, the composite sheet layer 311 includes a first layer 3111 and a second layer 3112 that are stacked. The first layer 3111 is provided on the surface of the adhesive layer 2 away from the display surface 101. The thickness of the first layer 3111 is between 0.2mm and 1mm to ensure that the first layer 3111 has good toughness and rigidity, which is beneficial to improve the screen cover Toughness and stiffness of plate 3. In this embodiment, the material of the first layer 3111 includes optical materials such as polycarbonate (PC, Polycarbonate), cyclic olefin polymer (COP, Cycio Olefins Polymer), or polycyclic olefin copolymer (COC, Cycloolefin Copolymer), and polycarbonate. Ester, cyclic olefin polymer or polycyclic olefin copolymer are all transparent materials and have good flexibility, which can not only increase the light transmittance of the screen cover 3, but also facilitate the bonding of the screen cover 3 and the display screen 1. Specifically, the intrinsic hardness of the first layer 3111 is greater than or equal to 1H, so as to increase the rigidity of the screen cover 3 and reduce the possibility of the first layer 3111 being scratched. In one embodiment, the birefringence of the first layer 211 is less than 0.8, and the low birefringence of the first layer 211 reduces the anisotropy of the first layer 211, improves the uniformity of the first layer 211, and reduces The influence of the screen cover 3 on the display screen of the display screen 1 is reduced, which is beneficial to improve the display uniformity of the display screen assembly 20.

The second layer 3112 is laminated on the surface of the first layer 3111 away from the adhesive layer 2. The thickness of the second layer 3112 is between 0.05mm and 0.5mm to ensure the shape stability of the second layer 3112 and ensure the second layer 3112 It has good toughness, hardness and rigidity, which is conducive to improving the toughness, hardness and rigidity of the screen cover. In this embodiment, the material of the second layer 3112 includes Polymethyl Methacrylate (PMMA). Polymethyl methacrylate is a transparent material, which is beneficial to improve the light transmittance of the screen cover 3. Specifically, the hardness of the second layer 3112 is between 1H and 4H to increase the hardness and rigidity of the second layer 3112, thereby increasing the hardness and rigidity of the screen cover 3, and avoiding the mobile terminal 100 from being broken due to falling or bumping. Effectively protect the display screen 1. In one embodiment, the first layer 3111 and the second layer 3112 are compounded by a co-extrusion process, which increases the bonding strength of the interface between the first layer 3111 and the second layer 3112. Moreover, there is no need to use glue to adhere the first layer 3111 and the second layer 3112, which improves the light transmittance of the composite sheet layer 311, thereby improving the light transmittance of the screen cover 3.

In this embodiment, the composite sheet layer 311 is a 3D sheet layer. Specifically, the composite sheet layer 311 is formed by a hot pressing process, which not only simplifies the forming process, but also does not affect the surface roughness of the composite sheet layer 311, and improves the surface finish of the composite sheet layer 311. In one embodiment, the composite sheet layer 311 is formed by blister molding the second layer 3112. Since the material of the second layer 3112 includes polymethyl methacrylate, the hardness and abrasion resistance of the second layer 3112 are very good. Compared with the blister molding of the first layer 3111, the second layer 3112 is processed in this embodiment. The blister molding can prevent the surface of the first layer 3111 from being scratched during the hot pressing process, and improve the reliability of the composite sheet layer 311 in use.

The first hardened layer 312 is arranged on the surface of the composite sheet layer 311 away from the display screen 1, that is, the first hardened layer 312 is arranged on the surface of the second layer 3112 away from the first layer 3111, and the thickness of the first hardened layer 312 is between 10 μm and 30 μm. Therefore, the first hardened layer 312 can be better attached to the surface of the composite sheet layer 311 away from the display screen 1 to improve the surface hardness of the screen cover 3. Specifically, the first hardening layer 312 includes a first resin layer and ceramic nanoparticles. The first resin layer is made of a transparent resin material to improve the light transmittance of the screen cover 3. The ceramic nano particles are dispersed in the first resin layer to increase the hardness of the first hardened layer 312. Wherein, the ceramic nanoparticles are made of aluminum sol or silica sol. Specifically, the hardness of the first hardened layer 312 is between 7H and 8H to increase the hardness of the screen cover 3, so that the overall material performance of the screen cover 3 is close to the performance of the glass cover, and has what the glass cover does not have. The drop resistance performance avoids the fragile problem of the glass cover. Among them, the first hardened layer 312 contains polymer additives such as fluorine-containing resin to reduce the specific surface energy of the first hardened layer 312, improve the self-cleaning function of the screen cover 3, and make the surface of the screen cover 3 have an anti-fingerprint function , Improve the surface cleanliness of the screen cover 3, and enhance the user experience. In one embodiment, the first hardened layer 312 is formed on the surface of the composite sheet layer 21 facing away from the display screen 1 by a curtain coating process, so as to increase the hardness of the outer surface 302 of the screen cover 3.

Please refer to FIG. 5. FIG. 5 is a detailed structural diagram of another embodiment of the screen cover 3 shown in FIG. 2.

The difference between the screen cover 3 shown in this embodiment and the first embodiment described above is that the first hardened layer 312 includes a first sub hardened layer 3121 and a second sub hardened layer 3122 that are sequentially stacked. Specifically, the first sub-hardened layer 3121 is disposed on the surface of the second layer 3112 away from the first layer 3111. The first sub-hardened layer 3121 does not contain fluorine-containing resin to increase the specific surface energy of the first sub-hardened layer 3121, so that the second sub-hardened layer 3122 is better attached to the surface of the first sub-hardened layer 3121. The second sub-hardened layer 3122 and the first sub-hardened layer 3121 are seamlessly connected to improve the bonding force between the second sub-hardened layer 3122 and the first sub-hardened layer 3121. The second sub-hardened layer 3122 is completely attached to the first sub-hardened layer 3121, and polymer materials such as fluorine-containing resin are added to the second sub-hardened layer 3122 to improve the self-cleaning function of the second sub-hardened layer 3122 and make the screen The surface of the cover plate 3 has an anti-fingerprint function, which improves the cleanliness of the surface of the screen cover plate 3 and enhances the user experience. In one embodiment, the first sub-hardened layer 3121 and the second sub-hardened layer 3122 are both formed on the surface of the composite sheet layer 311 through a curtain coating process, that is, the first hardened layer 312 is formed through two curtain coating processes.

Please refer to FIG. 6. FIG. 5 is a detailed structural diagram of the third embodiment of the screen cover 3 shown in FIG. 2.

The difference between the screen cover 3 shown in this embodiment and the above two embodiments is that the screen cover 3 further includes a second hardened layer 313, which is provided on the surface of the composite sheet layer 311 facing the display screen 1. . Specifically, the second hardened layer 313 is laminated on the surface of the first layer 3111 away from the second layer 3112. The thickness of the second hardened layer 313 is between 2 μm and 15 μm to ensure that the second hardened layer 313 has good hardness and optical properties, which can not only increase the hardness of the inner surface of the screen cover 3, but also reduce the production process of the screen cover 3 The first layer 3111 is scratched, and the display quality of the display screen assembly 20 is improved. Compared with the first hardened layer 312, the second hardened layer 313 does not contain fluorine-containing resin and ceramic nanoparticles, which can not only increase the specific surface energy of the second hardened layer 313, but also increase the gap between the screen cover 3 and the adhesive layer 2. The bonding force can also improve the optical performance of the second hardened layer 313 and improve the light transmittance of the screen cover 3. In one embodiment, the second hardened layer 313 is formed on the surface of the composite sheet layer 311 facing the display screen 1 through a curtain coating process, so as to increase the hardness of the inner surface 301 of the screen cover 3.

Please refer to FIG. 7, which is a detailed structural diagram of the fourth embodiment of the screen cover 3 shown in FIG. 2.

The difference between the screen cover 3 shown in this embodiment and the above three embodiments is that the composite sheet layer 3 further includes a third layer 3113, and the third layer 3113 is provided on the surface of the first layer 3111 away from the second layer 3112. In this embodiment, the material of the third layer 3113 includes polymethyl methacrylate. Polymethyl methacrylate is a transparent material, which is beneficial to improve the light transmittance of the screen cover 3. Moreover, polymethyl methacrylate has better hardness and rigidity, which can further increase the hardness and rigidity of the screen cover 3, avoid breaking due to the mobile terminal 100 being dropped or bumped, and effectively protect the display screen 1.

The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. It should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A display screen assembly, characterized in that it comprises a display screen, an adhesive layer and a screen cover, the adhesive layer is bonded between the display screen and the screen cover, and the screen cover includes a composite The sheet layer, the composite sheet layer includes at least two layers, and the material of the composite sheet layer includes at least two amorphous crystalline polymers to improve the strength and hardness of the screen cover.
The display screen assembly of claim 1, wherein the composite sheet layer comprises a first layer and a second layer that are stacked, and the material of the first layer comprises polycarbonate, cycloolefin polymer or polycarbonate. Cycloolefin copolymer, the material of the second layer includes polymethyl methacrylate.
The display screen assembly of claim 1, wherein the thickness of the screen cover is equal to or greater than 0.7 mm.
The display screen assembly of claim 2, wherein the hardness of the first layer is equal to or greater than 1H.
The display screen assembly according to claim 2, wherein the composite sheet layer further comprises a third layer, and the third layer is provided on a surface of the first layer facing away from the second layer, and the first layer The three-layer material includes polymethyl methacrylate.
The display screen assembly according to any one of claims 1-5, wherein the screen cover further comprises a first hardened layer, the first hardened layer being laminated on the composite sheet layer and facing away from the display screen s surface.
The display screen assembly of claim 6, wherein the hardness of the first hardened layer is equal to or greater than 7H.
The display screen assembly according to claim 6 or 7, wherein the first hardened layer comprises a first sub-hardened layer and a second sub-hardened layer that are stacked, and the second sub-hardened layer is in contact with the first sub-hardened layer. A sub-hardened layer is fully bonded.
The display screen assembly according to any one of claims 6-8, wherein the screen cover further comprises a second hardened layer, and the second hardened layer is laminated on the composite sheet layer facing the display screen. s surface.
The display screen assembly of claim 1, wherein the screen cover is a 3D cover.
The display screen assembly of claim 10, wherein the screen cover includes an inner surface facing the display screen, an outer surface disposed opposite to the inner surface, and an outer surface connected to the inner surface and the outer surface. The inner surface includes a flat middle area and an arc-shaped edge area, the side surface includes a first sub-side surface, and the first sub-side surface surrounds the edge of the first surface and is parallel to the first surface.述中区。 The middle area.
The display screen assembly of claim 11, wherein the size of the first sub-side surface is equal to or greater than half of the thickness of the screen cover along the direction from the inner surface to the outer surface. one.
The display screen assembly according to any one of claims 11 to 12, wherein the screen cover further comprises an ink layer, and the ink layer covers the part of the edge area away from the middle area and the side surface. .
A mobile terminal, comprising a middle frame and the display screen assembly according to any one of claims 1-13, and the screen cover is installed on the middle frame.
The mobile terminal according to claim 14, wherein the middle frame comprises a mounting surface facing the screen cover, the mounting surface is recessed with a limiting groove, and the screen cover is mounted on the limiting groove. Bit slot.