CN219800393U - Cover plate for display screen, display screen and electronic equipment - Google Patents

Abstract

The application provides a cover plate for a display screen, the display screen and electronic equipment, wherein the cover plate is provided with a bending part, the bending part can bend around a first axis, and the cover plate comprises at least one base layer. In the bending part of the cover plate, at least part of areas of at least part of the base layers are set to be unequal stretched base layers, and the modulus of the unequal stretched base layers in the first direction is smaller than that of the unequal stretched base layers in the second direction; the first direction is perpendicular to the direction of the first axis, and the second direction is parallel to the direction of the first axis. The modulus of the cover plate in the first direction is smaller, so that the internal stress and rebound force of the cover plate in the bending process are smaller, and the cover plate has good bending performance. Meanwhile, the modulus of the cover plate in the second direction is larger, so that good rigidity and strength can be kept, and the rigidity and strength of the cover plate as a whole are considered.

Description

Cover plate for display screen, display screen and electronic equipment

Technical Field

The application relates to the technical field of display screens, in particular to a cover plate for a display screen, the display screen and electronic equipment.

Background

The display screen typically includes a cover sheet, a display layer, and a support layer, which are stacked in sequence. The cover plate plays a role in protecting the display layer, and can protect the display layer from being damaged by external stress impact and external foreign matters.

The cover plate of the display screen in the prior art is generally mainly composed of a high modulus organic base film (which can be understood as a base layer) or an ultra-thin inorganic glass (which can be understood as a base layer), and the hardness and impact resistance of the cover plate are further improved by adding a layer of high modulus organic base film (which can be understood as a base layer) on the upper side or the lower side of the main body. In addition, the surface of the cover plate, which is away from one side of the display layer, is additionally provided with a hardening layer, so that the cover plate has higher hardness and the scratch resistance of the cover plate is improved.

However, in order to ensure good stress buffering effect and protection effect, the cover plate in the prior art has larger thickness and structural strength, when the cover plate is bent along with the display screen, the internal stress to which the cover plate is subjected in the bending process is larger, especially when the bending radius of the display screen is smaller (for example, the bending radius is smaller than 2.0 mm), the internal stress to which the cover plate is subjected in the bending process is obviously increased, so that the cover plate has larger resilience in the bending process, and therefore, the flexible display screen is difficult to bend, the bending performance of the display screen (or the bending performance of the display screen can be understood to be worse) is influenced, and the opening and closing use experience of the flexible display screen and the electronic equipment thereof is influenced.

On the other hand, in the prior art, in order to reduce the rebound force of apron in the bending process, promote the bending property of apron, necessarily lead to modulus and the structural strength of apron to reduce, influence the stress buffering effect and the protective effect of apron.

From the above, the existing cover plate cannot achieve both good protection performance and better bending performance in the bending process.

Disclosure of Invention

The utility model aims to solve the problems of good protective performance and better bending performance in the bending process of the flexible display screen cover plate in the prior art, and therefore, the utility model provides the cover plate for the display screen, which reduces the internal stress and rebound force of the cover plate of the display screen in bending, ensures higher rigidity and strength of the cover plate in the direction perpendicular to the bending direction, and ensures the impact resistance and stress buffering effect of the cover plate, so that the cover plate can give consideration to good protective performance and better bending performance in the bending process.

The embodiment of the utility model provides a cover plate for a display screen, which is provided with a bending part, wherein the bending part can bend around a first axis, and the cover plate comprises at least one layer of base layer;

In the bending part of the cover plate, at least part of areas of at least part of the base layers are set to be unequal stretched base layers, and the modulus of the unequal stretched base layers in the first direction is smaller than that of the unequal stretched base layers in the second direction; the first direction is perpendicular to the direction of the first axis, and the second direction is parallel to the direction of the first axis.

By adopting the technical scheme, in the bending part of the cover plate, the modulus of the unequal stretching base layer in the second direction (or the direction perpendicular to the bending direction of the bending part of the cover plate) is larger than the modulus of the cover plate in the first direction (or the bending direction of the bending part of the cover plate), so that the modulus of the unequal stretching base layer in the bending part of the cover plate in the first direction is smaller, and the internal stress and rebound force of the bending part of the cover plate in the bending process are smaller, so that the bending part of the cover plate has good bending performance. Meanwhile, the modulus of the cover plate bending part in the second direction is larger, so that the bending part of the cover plate can keep good rigidity and strength and has good protective performance, the bending performance and the protective performance of the cover plate bending part are considered, and the cover plate can be considered to have good protective performance and better bending performance in the bending process.

In some embodiments, in the fold of the cover sheet, at least a portion of the entire area of the base layer in at least one layer of base layer is configured to unequally stretch the base layer. The whole bending part of the cover plate can be provided with both bending performance and protective performance, so that the whole cover plate can be provided with both good protective performance and better bending performance in the bending process.

In some embodiments, the cover plate further has a non-bent portion contiguous with the bent portion;

the at least one base layer covers the entire non-bent portion and the entire bent portion of the cover plate, and all areas of at least part of the base layer of the at least one base layer are set to unequally stretch the base layer.

By adopting the technical scheme, the base layer is set to be in unequal stretching, so that the integration of the base layer is kept, the base layer is convenient to produce and process, and the production and processing cost is reduced.

In some embodiments, the cover plate further has a non-bent portion contiguous with the bent portion;

at least one layer of base layer covers the whole non-bending part and the whole bending part of the cover plate, at least part of the base layer corresponding to the non-bending part is connected with the unequal stretched base layer of the bending part, and the difference between the refractive index of the unequal stretched base layer of the bending part and the refractive index of at least part of the base layer of the connected non-bending part is smaller than 0.1. Thereby ensuring good optical performance and light transmittance of the base layer provided with the unequal stretched base layer, so that the cover plate can maintain good optical performance and light transmittance.

In some embodiments, at least one of the base layers in the bent portion of the cover plate includes a plurality of base layers stacked in a thickness direction of the cover plate, and at least a partial region of each of the plurality of base layers is configured to unequally stretch the base layer.

In some embodiments, the at least one base layer includes a first base layer and a second base layer, and the cover plate includes a hardened layer, a first base layer, a first adhesive layer, a second base layer, and a second adhesive layer that are sequentially stacked in a thickness direction of the cover plate;

at least one of the first base layer and the second base layer is configured to stretch the base layer in unequal amounts.

In some embodiments, the first and second glue layers are each provided as an optical glue layer, and the modulus of the first glue layer is less than the modulus of the second glue layer. The second adhesive layer with larger modulus can be stably adhered and fixed on the display layer of the display screen, and meanwhile, the first adhesive layer with smaller modulus can further reduce the internal stress and rebound force of the cover plate in the bending process.

In some embodiments, the first adhesive layer is formed by curing a liquid optical adhesive and the second adhesive layer is provided as an optical adhesive tape.

In some embodiments, the modulus of the unequal tensile base layer in the first direction is between 1GPa and 5GPa and the modulus of the unequal tensile base layer in the second direction is greater than 5GPa.

In some embodiments, the difference between the modulus of the unequal tensile base layer in the second direction and the modulus in the first direction is greater than 1GPa.

By adopting the technical scheme, the difference between the modulus of the unequal stretched base layer in the second direction and the modulus of the unequal stretched base layer in the first direction is obvious, the bending performance of the unequal stretched base layer in the first direction (or the bending direction of the cover plate bending part can be understood), meanwhile, the unequal stretched base layer in the second direction (or the direction perpendicular to the bending direction of the cover plate bending part can be understood) is kept to be good in rigidity and strength, and good in protective performance is achieved, so that the cover plate bending part can better consider both the bending performance and the protective performance, and further the cover plate can consider both the good protective performance and the better bending performance in the bending process.

In some embodiments, the unequal amount of tensile base layer comprises at least one of a polymeric film layer and a glass layer.

In some embodiments, the unequal tensile base layer comprises at least one of a polyethylene terephthalate based film layer, a transparent polyimide based film layer, and an ultra-thin inorganic glass layer.

The embodiment of the application also provides a display screen, which comprises a cover plate, a display layer and a support layer which are sequentially stacked, wherein the cover plate is the cover plate in any one of the embodiments.

By adopting the technical scheme, when the display screen is bent, the modulus of the cover plate in the bending direction is smaller, and the modulus of the cover plate in the direction perpendicular to the bending direction is larger; therefore, the modulus of the whole display screen in the bending direction is reduced, the bending performance of the display screen in the bending direction is improved, meanwhile, the strength and the rigidity of the cover plate of the display screen in the direction perpendicular to the bending direction are high, and the protective performance of the cover plate of the display screen is guaranteed.

The embodiment of the application also provides electronic equipment, which comprises the display screen.

By adopting the technical scheme, the cover plate has smaller modulus in the bending direction and larger modulus in the direction perpendicular to the bending direction in the folding and unfolding processes of the electronic equipment; therefore, the modulus of the whole display screen in the bending direction is reduced, the bending performance of the display screen in the bending direction is improved, and the operation experience of the electronic equipment in the folding and unfolding processes is improved. Meanwhile, the cover plate of the display screen has good protective performance, so that the display screen of the electronic equipment has good reliability and durability.

In some embodiments, the electronic device further comprises:

The shell comprises a first middle frame, a second middle frame and a rotating shaft mechanism rotationally connected with the first middle frame and the second middle frame;

the display screen is arranged in the shell and covers the first middle frame, the second middle frame and the rotating shaft mechanism;

the bending part of the cover plate of the display screen and at least part of the rotating shaft mechanism are overlapped.

Drawings

Fig. 1 is a schematic structural view of an electronic device in an unfolded state according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an electronic device in a folded state according to an embodiment of the present application;

FIG. 3 is an exploded view of an electronic device according to an embodiment of the present application;

FIG. 4a is a simplified stress diagram of an electronic device according to an embodiment of the present application before the display screen is at the elastic recovery limit during deployment;

FIG. 4b is a simplified stress diagram of an electronic device with a display screen at the elastic recovery limit during deployment according to an embodiment of the present application;

FIG. 4c is a simplified stress diagram of an electronic device according to an embodiment of the present application when the display screen during the unfolding process exceeds the elastic recovery limit;

FIG. 5 is an exploded view of a display screen according to an embodiment of the present application;

FIG. 6a is a side view of an embodiment of the present application in a flattened display screen;

FIG. 6b is a side view of another embodiment of the display screen of an embodiment of the present application in a flattened state;

FIG. 7 is a side view of a display screen in a bent state according to an embodiment of the present application;

FIG. 8 is an exploded view of a cover plate according to an embodiment of the present application;

FIG. 9 is a schematic view of a partial cross-sectional structure of a cover plate according to an embodiment of the present application;

FIG. 10 is a schematic view of an exploded structure of another implementation of a cover plate of an embodiment of the present application;

FIG. 11 is a schematic view in partial cross-section of another implementation of a cover plate of an embodiment of the present application;

FIG. 12 is a schematic view of an exploded structure of a further implementation of a cover plate of an embodiment of the present application;

FIG. 13 is a schematic view in partial cross-section of a further implementation of a cover plate of an embodiment of the application;

FIG. 14a is a partial cross-sectional view of a first base layer and a first glue layer of a cover plate according to an embodiment of the application;

FIG. 14b is a partial structural cross-sectional view of another implementation of the first base layer and first glue layer of the cover plate of the embodiment of the application;

FIG. 14c is a partial structural cross-sectional view of yet another implementation of the first base layer and first glue layer of the cover plate of the embodiment of the application;

FIG. 14d is a partial structural cross-sectional view of still another implementation of the first base layer and first glue layer of the cover sheet of the embodiment of the application;

Fig. 15 is a schematic diagram showing comparison of the rebound moment values of the electronic device according to the embodiment of the present application and the electronic device according to the comparative example during bending.

Reference numerals illustrate:

1. an electronic device;

10. a display screen; a. a first axis; s, bending direction;

11. a display layer; 12. a support; 13. a bending region; 14. a first non-inflection region; 15. a second non-inflection region; 16. a protective film layer;

100. a cover plate; 101. a bending part; 102. a first non-bent portion; 103. a second non-bent portion;

x, a first direction; y, second direction; H. a thickness direction;

110. a hardening layer; 120. a first base layer; 130. a first adhesive layer; 140. a second base layer; 150. a second adhesive layer; 160. unequal stretching of the base layer;

20. a housing;

21. a first middle frame; 22. a second middle frame; 23. a rotating shaft mechanism.

Detailed Description

Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present application with specific examples. While the description of the application will be presented in connection with certain embodiments, it is not intended to limit the features of this application to only this embodiment. Rather, the purpose of the present application is to cover other alternatives or modifications, which may be extended by the claims based on the application. The following description contains many specific details for the purpose of providing a thorough understanding of the present application. The application may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 to 4c, fig. 1 is a schematic structural diagram of an electronic device in an unfolded state according to an embodiment of the present application, fig. 2 is a schematic structural diagram of the electronic device in a folded state according to an embodiment of the present application, fig. 3 is an exploded structural diagram of the electronic device according to an embodiment of the present application, and fig. 4a to 4c are simplified stress diagrams of a display screen of the electronic device in an unfolding process according to an embodiment of the present application.

As shown in fig. 1 to 4c, the present application provides an electronic device 1, where the electronic device 1 may be a foldable tablet computer, a foldable mobile phone, a foldable wearable device, or the like. The electronic device 1 of the present embodiment is illustrated by taking a foldable mobile phone as an example.

In one embodiment, the electronic device 1 includes a housing 20 and a display screen 10, the housing 20 includes a first middle frame 21, a second middle frame 22, and a rotation shaft mechanism 23 rotatably connecting the first middle frame 21 and the second middle frame 22, such that the first middle frame 21 and the second middle frame 22 of the housing 20 can rotate relative to the rotation shaft mechanism 23, so that the housing 20 of the electronic device 1 can be folded or unfolded, so that the electronic device 1 can be folded from an unfolded state to a folded state (i.e., from fig. 1 to fig. 2), or unfolded from a folded state to an unfolded state (i.e., from fig. 2 to fig. 1).

In one embodiment, the display screen 10 is disposed in the housing 20 and covers the first middle frame 21, the second middle frame 22 and the rotating shaft mechanism 23. The display screen 10 has good bending performance, and the display screen 10 covering the first middle frame 21, the second middle frame 22 and the rotating shaft mechanism 23 can be folded or flattened along with the folding or unfolding of the casing 20, and can maintain continuous and stable image display, and can perform sensitive touch experience.

It should be noted that the type of the display screen 10 in the present application is not limited. In one embodiment, the display 10 may be an organic light-emitting diode (OLED) display, an active-matrix organic light-emitting diode (OLED) or an active-matrix organic light-emitting diode (AMOLED) display, or the like.

In other alternative embodiments, the housing 20 may include three or more middle frames, and adjacent middle frames are connected by the hinge mechanism 23, so that multiple areas of the housing 20 may be folded or unfolded, for example, when the housing 20 includes three middle frames that are sequentially connected, the areas corresponding to the two hinge mechanisms 23 of the housing 20 may be folded or unfolded, and at this time, the display screen 10 covering the housing 20 may also have two corresponding bendable or unfolded areas.

Meanwhile, different regions of the case 20 that can be folded or unfolded may have the same or different states, for example, when two regions of the case 20 can be folded or unfolded, one region of the case 20 may be in a folded state and the other region may be in an unfolded state.

In other alternative embodiments, the housing 20 may also be made of an integrally formed flexible material (e.g., rubber material, plastic, etc.), such that the entire housing 20 may be freely bendable or the entire housing 20 may be bendable in a particular direction. At this time, the entire region of the display screen 10 provided to the housing 20 may be freely bent along with the entire housing 20 or may be bent in the same specific direction.

It will be appreciated by those skilled in the art that when the housing 20 includes three or more middle frames rotatably connected to each other, the housing 20 may have various folding and unfolding modes, and the display 10 disposed in the housing 20 may also have various folding and unfolding modes according to the folding or unfolding of the housing 20. Specifically, the present application is not limited.

When the casing 20 is folded to enable the electronic device 1 to be folded in an unfolded state, the first middle frame 21 and the second middle frame 22 are folded relatively towards one side of the display screen 10 (i.e. the casing 20 is folded inwards), so that the display screen 10 is wrapped in the electronic device 1 by the first middle frame 21 and the second middle frame 22 after being folded, on one hand, the first middle frame 21 and the second middle frame 22 can protect the display screen 10, the reliability of the electronic device 1 is improved, on the other hand, the maximum size of the electronic device 1 is reduced, and therefore portability of the electronic device 1 is improved, and the electronic device 1 is convenient to store and carry.

In other alternative embodiments, when the housing 20 is folded, so that the electronic device 1 is folded in the open state to the folded state, the first middle frame 21 and the second middle frame 22 may also be folded relatively towards the side facing away from the display screen 10 (i.e. the housing 20 is folded outwards), so that the display screen 10 covers the outer surfaces of the first middle frame 21 and the second middle frame 22 after being folded, so that the electronic device 1 can still perform normal display in the folded state in the whole display area of the display screen 10, and interact with the user of the electronic device 1, thereby improving the flexibility of use of the electronic device 1.

When the housing 20 is unfolded, the electronic device 1 is unfolded from the folded state to the unfolded state, the first middle frame 21, the second middle frame 22 and the rotating shaft mechanism 23 can provide flat support for the display screen 10, so that the display screen 10 of the electronic device 1 is in the flat state, and the display screen 10 of the electronic device 1 can provide flat and large-area picture display and touch control areas, so that the large-screen use requirement of a user is met, and the user can obtain good watching or operation experience when the electronic device 1 is in the unfolded state.

It should be noted that, the flat support provided by the housing 20 to the display screen 10 when being unfolded can be a flat support or a curved support with smooth transition, and only the display screen 10 needs to be supported to keep the display screen 10 in a flat state, so that the problems of distortion, deformation and the like of the display screen 10 are avoided, and the display effect and touch experience of the display screen 10 are affected.

Further, before the housing 20 is unfolded and the display 10 reaches the elastic recovery limit (as shown in fig. 4 a), the display 10 in the folded state automatically rebounds under the action of the internal stress and generates a rebound force F on the housing 20, and at this time, the rebound force F of the display 10 is the same as the unfolding direction of the housing 20, so as to form an acting force for promoting the housing 20 to be unfolded. When the housing 20 continues to expand and the display 10 reaches the elastic return limit (as shown in fig. 4 b), the display 10 stops rebounding, so that the rebounding force F of the rebounding is not generated. When the housing 20 continues to be unfolded to the open state and the display screen 10 exceeds the elastic recovery limit (as shown in fig. 4 c), the display screen 10 generates internal stress again to prevent the display screen 10 from flattening, and generates a repulsive force F to the housing 20, at this time, the repulsive force F of the display screen 10 is opposite to the unfolding direction of the housing 20, so as to form an acting force for preventing the housing 20 from flattening.

However, during the process of folding the case 20, the case 20 applies a bending force to the display 10, so that the display 10 deforms under the bending force of the case 20 and generates internal stress, at this time, before the display 10 reaches the elastic recovery limit, the stress in the display 10 forms a rebound force F on the case 20 in the same direction as the bending force, thereby promoting the folding of the case 20, and after the display 10 exceeds the elastic recovery limit, the stress in the display 10 forms a rebound force F on the case 20 in the opposite direction to the bending force, and the rebound force F of the display 10 is opposite to the folding direction of the case 20, thereby preventing the case 20 from folding.

Therefore, when the rebound force F is large, the user needs to apply a larger force to fold the housing 20 of the electronic device 1 or to expand the electronic device 1 to the open state under the action of the rebound force F of the display screen 10, so that it is difficult for the user to fold the housing 20 or to expand the electronic device 1 to the open state; moreover, the stability of the folded housing 20 is poor due to the promotion of the rebound force F of the display screen 10, which is easy to automatically expand under external force (e.g. vibration, impact, etc.), or the housing 20 of the electronic device 1 cannot be completely folded, which affects the normal use of the electronic device 1.

However, when the repulsive force F is reduced, the user can fold or flatten the housing 20 more easily, and when the housing 20 is in the folded state, the housing 20 can be stably maintained in the folded state, and is not easily automatically unfolded under external force (e.g., vibration, impact, etc.). Meanwhile, the user has less difference in hand feeling when unfolding and folding the housing 20 of the electronic device 1, and the use experience of the electronic device 1 is improved.

It will be appreciated by those skilled in the art that the display 10 may be disposed over any of the flexible housings 20, and at least a portion of the area of the display 10 may be bent accordingly with bending of the housing 20. Therefore, the area of the display 10 that is bent along with the bending of the housing 20 is defined as the bending area 13, and the area of the display 10 that is not bent and deformed during the bending of the housing 20 is defined as the non-bending area. It should be emphasized that the specific shape and configuration of the non-inflection regions of the display 10 of the present application is not limited. For example, the non-bending region of the display panel 10 may be a region where a flat display is maintained, or may be a region where a curved display is performed while being maintained in a curved state.

In one embodiment, the display 10 includes a bending region 13, and a first non-bending region 14 and a second non-bending region 15 connected to two sides of the bending region 13, so that the first non-bending region 14 and the second non-bending region 15 on two sides of the bending region 13 can be folded or unfolded relatively, and the non-bending region of the display 10 includes the first non-bending region 14 and the second non-bending region 15. Meanwhile, the area of the display screen 10 corresponding to the rotating shaft mechanism 23 is a bending area 13, and the areas corresponding to the first middle frame 21 and the second middle frame 22 are a first non-bending area 14 and a second non-bending area 15, respectively, so that the display screen 10 is folded or unfolded synchronously along with the folding or unfolding of the shell 20.

In other alternative embodiments, the display 10 may also have a plurality of inflection zones 13, or the entire display 10 may be an inflection zone 13. For example, when the case 20 has a plurality of areas where folding or unfolding can be performed, the display screen 10 covering the above areas of the case 20 at the same time may have a plurality of bending areas 13; when the display screen 10 is disposed on the whole flexible housing 20 in a covering manner or only covers the area where the housing 20 is folded or unfolded, the whole display screen 10 is the bending area 13.

In other alternative embodiments, the display 10 may be provided with only one non-bending region, or with 3 or more non-bending regions. For example, the display screen 10 may include only one inflection region 13, and the first non-inflection region 14 or the second non-inflection region 15 connected to one side of the inflection region 13.

Referring to fig. 5 to 7, fig. 5 is an exploded structure diagram of a display screen according to an embodiment of the present application, fig. 6a is a side view of the display screen according to an embodiment of the present application in a flattened state, fig. 6b is a side view of the display screen according to another embodiment of the present application in a flattened state, and fig. 7 is a side view of the display screen according to an embodiment of the present application in a bent state.

As shown in fig. 5 to 7, the display panel 10 includes a cover plate 100, a display layer 11, and a support 12, which are sequentially stacked in the thickness direction H of the display panel 10.

In one embodiment, the display layer 11 may be an organic light-emitting diode (OLED) display layer, an active-matrix organic light-emitting diode (OLED) or an active-matrix organic light-emitting diode (AMOLED) display layer, or the like. The display layer 11 of the display screen 10 is made of a flexible material (e.g., a flexible organic material, ultra-thin glass, etc.), has good bending properties, and can maintain stable picture display during deformation or bending.

In one embodiment, the rigidity and strength of the display layer 11 are small, so that the display layer 11 is easy to deform, twist or dent under the action of external force, thereby affecting the display effect of the display layer 11. Therefore, the support member 12 is disposed on one side of the display layer 11, the support member 12 can provide support in the thickness direction H for the display layer 11, and the support member 12 is made of a rigid material, so that the display layer 11 has good structural strength and rigidity, and is not easy to deform, twist or dent under the action of external force. Meanwhile, the supporting piece 12 has higher bending performance corresponding to the bending area 13 of the display screen 10, so that the bending area 13 of the display screen 10 can be ensured to be bent normally.

In one embodiment, the cover plate 100 is disposed on a side of the display layer 11 away from the supporting member 12, and plays a role in protecting the display layer 11, and has impact resistance and scratch resistance; and the cover plate 100 is made of a light-transmitting material, so that light of the display layer 11 can be displayed through the cover plate 100. Meanwhile, the area of the cover plate 100 corresponding to the bending area 13 of the display screen 10 has higher bending performance, so that the bending area 13 of the display screen 10 can be ensured to be bent normally.

In other alternative embodiments, as shown in fig. 6b, the display screen 10 further includes a protective film layer 16, and the protective film layer 16 is disposed on a side of the cover plate 100 facing away from the display layer 11. Wherein, protection rete 16 detachably covers in apron 100, can play shock resistance and prevent scraping the effect to when protection rete 16 appear the condition such as mar, wearing and tearing or damage, can dismantle protection rete 16 from apron 100, and change a new protection rete 16, improve the durability and the use experience of display screen 10.

It will be appreciated by those skilled in the art that the structure of the display 10 may be freely configured. For example, the display screen 10 may include only the cover plate 100 and the display layer 11, or the display screen 10 may further include other structural layers (e.g., a touch layer, an adhesive layer, etc.).

In one use scenario, when the bending region 13 of the display screen 10 is bent, the cover plate 100, the display layer 11 and the supporting member 12 in the display screen 10 are synchronously bent in the region corresponding to the bending region 13, so that the bending direction and the bending manner of the cover plate 100, the display layer 11 and the supporting member 12 are the same as the bending direction and the bending manner of the whole display screen 10.

When the bending region 13 of the display screen 10 is bent around an axis, the direction of rotation around the axis is the bending direction S (as shown in fig. 4 a) of the bending region 13 of the display screen 10, and the axis is the bending axis of the bending region 13 of the display screen 10. At this time, the cover plate 100 in the display screen 10 has the same bending direction and bending axis as the display screen 10, and the bending axis is the first axis a of the cover plate 100.

In one embodiment, the area of the cover plate 100 corresponding to the bending area 13 of the display screen 10 in the thickness direction H of the cover plate 100 is the bending portion 101 of the cover plate 100, the area of the cover plate 100 corresponding to the non-bending area of the display screen 10 is the non-bending portion of the cover plate 100, and the non-bending portion of the cover plate 100 is connected to the bending portion 101 of the cover plate 100. As will be understood in conjunction with fig. 1 and 3, the non-bending portion of the cover plate 100 includes a first non-bending portion 102 and a second non-bending portion 103, and the first non-bending portion 102 and the second non-bending portion 103 of the cover plate 100 correspond to the first non-bending region 14 and the second non-bending region 15 of the display screen 10, respectively.

In other alternative embodiments, the display screen 10 has 1, 3 or more non-bending regions, and the cover plate 100 may be correspondingly provided with 1, 3 or more non-bending portions.

It will be understood by those skilled in the art that the bending portion 101 of the cover plate 100 corresponds to the bending region 13 of the display screen 10, when the display screen 10 has a plurality of bending regions 13, the cover plate 100 may be correspondingly provided with a plurality of bending portions 101, and when the whole area of the display screen 10 is the bending region 13, the whole area of the cover plate 100 corresponding to the whole area of the display screen 10 is also provided with the bending portion 101, and at this time, the whole area of the cover plate 100 is the bending portion 101.

Referring to fig. 8 to 14d, fig. 8 is an exploded view of the cover plate according to the embodiment of the present application, fig. 9 is a partially cross-sectional view of the cover plate according to the embodiment of the present application, and fig. 10 to 13 are an exploded view and a partially cross-sectional view of other embodiments of the cover plate according to the embodiment of the present application; fig. 14a to 14d are partial structural cross-sectional views of other implementations of the first base layer and the first glue layer of the cover plate according to the embodiment of the present application.

It should be noted that the schematic diagrams of the differential stretch base layer 160 shown in fig. 8, 10 and 12 are only used to distinguish the differential stretch base layer 160 from other components, and illustrate the location and area where the differential stretch base layer 160 is disposed, and do not represent the actual structure of the differential stretch base layer 160.

As shown in fig. 8 to 14d, and as will be understood in conjunction with fig. 1 and 2, the cover 100 has a bending portion 101, and the bending portion 101 of the cover 100 is bendable about a first axis a, and the cover 100 includes at least one base layer. Among them, the base layer is made of a high modulus material such as polyethylene terephthalate (Polyethylene terephthalate, PET) plastic, colorless transparent polyimide film (Colorless Polyimide, CPI), ultra-thin inorganic glass (UTG), thermoplastic polyurethane elastomer rubber (Thermoplastic polyurethanes, TPU), and the like. The main body of the cover plate 100 has good protection function, can absorb external impact force (such as impact, extrusion rubbing and the like of an external object on the cover plate 100), and has good stress buffering effect, so that the cover plate 100 can protect the display layer 11 (shown in fig. 6 a) from being damaged by the external impact force.

It should be noted that, the base layer in the conventional cover plate is generally configured to stretch the base layer equally, and the modulus of the base layer stretched equally in all directions is substantially uniform. If the modulus of the base layer in the existing cover plate is improved, the overall structural strength and rigidity of the existing cover plate can be improved, and the protective performance of the existing cover plate can be improved, however, the bending performance of the existing cover plate is reduced as the structural strength and rigidity of the existing cover plate are improved, so that the existing cover plate is difficult to bend. If the modulus of the base layer in the existing cover plate is reduced, the internal stress and rebound force of the existing cover plate in the bending process are reduced, and the bending performance of the existing cover plate can be improved, however, the structural strength and rigidity of the existing cover plate are reduced as the modulus of the base layer of the existing cover plate is reduced, so that the protective performance of the cover plate is reduced. Therefore, the existing cover plate cannot give consideration to the protection performance and the bending performance in the bending process.

Therefore, the embodiment of the application provides the cover plate, which can give consideration to the protection performance and the bending performance in the bending process. As shown in fig. 8 to 14d, in one embodiment, in the bent portion 101 of the cover plate 100, at least a partial region of at least a part of the base layers is provided as the unequal stretched base layer 160, and the modulus of the unequal stretched base layer 160 in the first direction X is smaller than the modulus of the unequal stretched base layer 160 in the second direction Y; the first direction X is perpendicular to the direction of the first axis a, and the first direction X may be understood as a bending direction of the differential stretching substrate 160, and the second direction Y is parallel to the direction of the first axis a. It will be appreciated by those skilled in the art that the foregoing "perpendicular" and "parallel" are not strictly perpendicular and parallel in a mathematical sense and that certain errors and deviations may exist.

Wherein, modulus refers to the ratio of stress to strain of an object under stress. The modulus of the object is larger, the stress of the object for generating a certain elastic deformation is larger (or it is understood that the rebound force of the object is larger when the object generates a certain elastic deformation).

In one embodiment, the unequal stretched base layer 160 may be provided as an unequal stretched base film, and the unequal stretched base film may be characterized by: the base film is stretched in different directions in the preparation process, and the stretching degree of the base film in different directions is different, so that the orientation degree of molecular chains of the base film in the stretching direction is different on the microcosmic scale, and the modulus is distributed in a directional manner. For example, during the formation of the unequal stretched base film, the stretching force is greater along the second direction Y, and thus the unequal stretched base film is oriented to a greater degree in the second direction Y than in the first direction X, or it can be understood that the macromolecules in the unequal stretched base film are aligned to a greater degree in the second direction Y than in the first direction X by the crystalline structure of the molecular chains, segments or crystalline macromolecules under the influence of an external force. Such that the modulus of the unequal tensile base layer 160 in the first direction X is less than the modulus of the unequal tensile base layer 160 in the second direction Y. It should be noted that the specific structure and type of the unequal stretched base film are not limited, and products (e.g., TA069 spun by eastern ocean) existing in the prior art can be used, and will not be described in detail herein.

When the bending portion 101 of the cover plate 100 bends around the first axis a, since the modulus of the unequal stretched base layer 160 in the first direction X (or the bending direction of the bending portion 101 of the cover plate 100 can be understood) is smaller, the internal stress and the rebound force generated when the unequal stretched base layer 160 bends in the first direction X are smaller, so that the unequal stretched base layer 160 has better bending performance in the first direction X, the unequal stretched base layer 160 is easier to bend around the first axis a, and the bending effect is better. In addition, when the rebound force of the cover plate 100 when bending is reduced, the rebound force of the cover plate 100 as a whole and the rebound force of the display screen 10 when bending are synchronously reduced, so that the use experience of the electronic equipment 1 is improved.

Further, the modulus of the unequal stretched base layer 160 in the second direction Y is larger, so that the unequal stretched base layer 160 has good rigidity and stability in the second direction Y, and bending, twisting and the like are not easy to occur. Thereby improving the stability and rigidity of the bending part 101 of the cover plate 100 in the second direction Y, preventing the bending and twisting phenomena from occurring, and improving the bending stability of the bending part 101 of the cover plate 100 in the first direction X. Meanwhile, the rigidity and strength of the unequal tensile base layer 160 as a whole are ensured, the structural strength and rigidity of the cover plate 100 as a whole are considered, and the protective performance of the cover plate 100 as a whole is ensured.

Therefore, compared to the cover plate in the prior art, the bending portion 101 of the cover plate 100 of the present application can achieve both bending performance in the first direction X and overall protection performance. For example, in the case of ensuring that the modulus of the unequal stretched base layer 160 of the bent portion 101 of the cover plate 100 in the first direction X is the same as the modulus of the equal stretched base layer in the first direction in the prior art (the modulus of the equal stretched base layer in each direction is identical), the modulus of the bent portion 101 of the cover plate 100 in the second direction Y of the cover plate 100 is greater than the modulus of the equal stretched base layer in the second direction in the prior art, so that the overall structural strength and rigidity of the cover plate 100 of the application are greater, and the cover plate 100 of the application has better protective performance; on the other hand, in the case where the modulus of the unequal stretched base layer 160 in the second direction Y of the folded portion 101 of the cover plate 100 of the present application is ensured to be the same as the modulus of the equal stretched base layer in the second direction in the prior art (the modulus of the equal stretched base layer in each direction is identical), the modulus of the folded portion 101 of the cover plate 100 of the present application in the first direction X is smaller than the modulus of the equal stretched base layer in the first direction in the prior art, so that the internal stress and the rebound force when the folded portion 101 of the cover plate 100 of the present application is folded in the first direction X are smaller, and the folding performance is better.

In one embodiment, the modulus of the differential tensile base layer 160 in the first direction X is 1GPa to 5GPa (e.g., 2GPa, 3GPa, 3.5GPa, etc.), and the modulus of the differential tensile base layer 160 in the second direction X is greater than 5GPa (e.g., 6GPa, 7GPa, 8GPa, etc.). It will be appreciated by those skilled in the art that the modulus of the differential stretch substrate 160 in the first direction X need only be less than the modulus of the differential stretch substrate 160 in the second direction X. Thus, in other alternative embodiments, the modulus of the unequal tensile base layer 160 in the first direction X may also be greater than 5GPa, or may be less than 1GPa; on the other hand, the modulus of the unequal tensile base layer 160 in the second direction X may also be less than or equal to 5GPa.

In one embodiment, the difference between the modulus of the unequal tensile base layer 160 in the second direction Y and the modulus in the first direction X is greater than 1GPa (e.g., 2GPa, 3GPa, 3.5GPa, etc.). The difference between the modulus of the unequal stretched base layer 160 in the second direction Y and the modulus of the unequal stretched base layer 160 in the first direction X is made obvious, the bending performance of the unequal stretched base layer 160 in the first direction X is guaranteed to be obviously improved, meanwhile, the unequal stretched base layer 160 is enabled to maintain good rigidity and strength in the second direction Y, the bending stability of the unequal stretched base layer 160 in the first direction X is guaranteed, and meanwhile, the rigidity and strength of the unequal stretched base layer 160 as a whole are guaranteed. In other alternative embodiments, the difference between the modulus of the unequal tensile base layer 160 in the second direction Y and the modulus in the first direction X may also be less than or equal to 1GPa.

In one embodiment, the unequal tensile base layer 160 may include at least one of a polymeric film layer and a glass layer, for example, the unequal tensile base layer 160 may include only a polymeric film layer or a glass layer, or may include both a polymeric film layer and a glass layer. Wherein the polymer film layer can be a polyethylene terephthalate base film layer, a transparent polyimide base film layer and the like; the glass layer may be an ultra-thin inorganic glass layer.

In one embodiment, as shown in fig. 8, 9 and 14a, at least one base layer includes a first base layer 120 and a second base layer 140, and the cover plate 100 includes a cured layer 110, a first base layer 120, a first adhesive layer 130, a second base layer 140 and a second adhesive layer 150, which are sequentially stacked in a thickness direction H of the cover plate 100. The cover plate 100 is adhesively fixed to the display layer 11 through a second adhesive layer 150 (as shown in fig. 6 a).

In one embodiment, the hardened layer 110 has a higher hardness, which can reduce the risk of scratches left on the hardened layer 110 of the cover plate 100 by external objects, and improve the scratch-proof effect of the cover plate 100, thereby reducing the risk of scratches on the surface of the cover plate 100, ensuring the light-transmitting effect of the cover plate 100, and thus ensuring the display effect of the display screen 10 (as shown in fig. 6 a).

It will be appreciated by those skilled in the art that the cover plate 100 need only have at least one base layer, and thus, in other alternative embodiments, the cover plate 100 may have only one base layer, or may have 3 or more base layers.

Further, other structural layers of the cover plate 100 may be freely disposed, for example, the cover plate 100 may not be provided with the hardening layer 110 or the first adhesive layer 130, or the cover plate 100 may include other structural layers (for example, a polarizer layer).

In one embodiment, the first and second base layers 120 and 140 cover the entire bent portion 101 and the entire non-bent portion of the cap plate 100, and the entire areas of the first and second base layers 120 and 140 located at the bent portion 101 of the cap plate 100 are provided as the unequal amount of the stretching base layer 160. Thereby reducing the internal stress and rebound force generated by the bending part 101 of the cover plate 100 in the bending process to the maximum extent, reducing the overall rebound force of the display screen 10 and improving the use experience of the electronic equipment 1.

In other alternative embodiments, only the partial areas of the first and second base layers 120 and 140 located at the bent portion 101 of the cover plate 100 may be configured to unequally stretch the base layer 160.

In one embodiment, the entire areas of the first and second base layers 120 and 140 located at the first and second non-bent portions 102 and 103 of the cover plate 100 are provided to stretch the base layers in equal amounts. At this time, the equally stretched base layers of the first base layer 120 and the second base layer 140 located at the first non-bent portion 102 and the second non-bent portion 103 of the cover 100 are connected with the unequally stretched base layers 160 of the first base layer 120 and the second base layer 140 located at the bent portion 101 of the cover 100. And the difference between the refractive index of the unequal stretched base layer 160 of the bent portion 101 and the refractive index of the equal stretched base layer of the connected non-bent portion is less than 0.1. Thereby ensuring the optical effect of the cover plate 100 and avoiding the phenomena of distortion or deformation and the like when the picture displayed by the display layer 11 (shown in fig. 5) passes through the cover plate 100, thereby influencing the normal display of the display screen 10.

In other alternative embodiments, as shown in fig. 10 and 11, the entire areas of the first and second base layers 120 and 140 located at the first and second non-bent portions 102 and 103 of the cover plate 100 may be equally configured to unequally stretch the base layer 160. At this time, the entire areas of the first and second base layers 120 and 140 are set to be unequal amounts of the stretching base layers 160, thereby facilitating the maintenance of the integrity of the first and second base layers 120 and 140, facilitating the production and processing of the first and second base layers 120 and 140, and reducing the production and processing costs.

It will be appreciated by those skilled in the art that when at least one base layer of the cover plate 100 includes a plurality of base layers, only at least one base layer of the plurality of base layers in the bent portion 101 of the cover plate 100 needs to be provided with the differential stretching base layer 160, so that both the bending performance of the bent portion 101 of the cover plate 100 in the first direction X and the protective performance of the cover plate 100 as a whole can be considered. Thus, in other alternative embodiments, as shown in fig. 12 and 13, the entire area of the first base layer 120 of the cover plate 100 may be provided as the unequal stretch base layer 160, and the second base layer 140 may be provided as the equal stretch base layer.

In one embodiment, as shown in fig. 14a, the first base layer 120 (or may be understood as an equally stretched base film layer) located at the first non-bent portion 102 and the first base layer 120 (or may be understood as an unequally stretched base layer 160) located at the bent portion 101 may directly meet, and the surface where the first base layer 120 located at the first non-bent portion 102 and the first base layer 120 located at the bent portion 101 meet is parallel to the thickness direction H of the cover plate 100. In other alternative embodiments, as shown in fig. 14b to 14d, the first base layer 120 (or alternatively understood as an equally stretched base film layer) located at the first non-bent portion 102 and the first base layer 120 (or alternatively understood as an unequally stretched base layer 160) located at the bent portion 101 may also be fixed by optical adhesive bonding. As shown in fig. 14c and 14d, the surface of the first base layer 120 located at the first non-bent portion 102 opposite to the first base layer 120 located at the bent portion 101 may be inclined with respect to the thickness direction H of the cover plate 100. Wherein, the difference between the refractive index of the first base layer 120 at the first non-bending portion 102 and the refractive index of the first base layer 120 at the bending portion 101 and the refractive index of the bonded optical adhesive is less than 0.1.

In one embodiment, the first adhesive layer 130 and the second adhesive layer 150 are both optical adhesive layers, and have good light transmittance, so that on one hand, the adhesion and fixation function is achieved, and on the other hand, the light transmittance and the optical effect of the cover plate 100 can be ensured. And the modulus of the first adhesive layer 130 is smaller than that of the second adhesive layer 150, so that the first adhesive layer 130 has a smaller modulus, and when the cover plate 100 is bent, the internal stress and the rebound force of the first adhesive layer 130 are reduced, thereby reducing the overall internal stress and the rebound force when the cover plate 100 is bent. Thereby reducing the overall resilience of the display screen 10 and improving the use experience of the electronic device 1.

In other alternative embodiments, the modulus of the first glue layer 130 may also be equal to or greater than the modulus of the second glue layer 150.

In one embodiment, the first glue layer 130 is formed after curing by a Liquid Optical glue, for example, a Liquid Optical glue (Liquid Optical ClearAdhesive, LOCA), an optically transparent resin (Optically Clear Resin, OCR), or the like. So that the first adhesive layer 130 has the characteristics of low modulus, high rebound and high cohesive strength. Wherein the first glue layer 130 has a room temperature shear modulus of 5kPa to 25kPa, a creep resilience >85%, and a cohesive strength >1.5N/cm. In other alternative embodiments, the first adhesive layer 130 may also be provided as other optical adhesives, for example, optical adhesive tape (Optically Clear Adhesive, OCA).

In one embodiment, the second glue layer 150 is provided as an Optical tape (Optical ClearAdhesive, OCA), and in other alternative embodiments, the second glue layer 150 may also be provided as other Optical glue, for example, liquid Optical ClearAdhesive, LOCA, optically transparent resin (Optically Clear Resin, OCR), etc.

Referring to fig. 15, fig. 15 is a schematic diagram showing a comparison of the rebound moment values of the electronic device in the embodiment of the application and the electronic device in the comparative example during bending. The cover plate 100 of the display screen 10 of the electronic device 1 according to the embodiment of the present application adopts the structure of the cover plate 100 shown in fig. 8, and the structure of the electronic device according to the comparative example is substantially the same as the structure of the electronic device 1 according to the embodiment of the present application, which is different in that the first base layer and the second base layer in the cover plate of the display screen of the electronic device according to the comparative example are integrally provided as an equally stretched base film layer.

Further, the abscissa in fig. 15 represents the bending angle of the electronic device, the ordinate represents the rebound moment value when the electronic device is bent, and the curve represents the change relation of the rebound moment value received by the electronic device along with the bending angle in the whole process from an open state (0 °) to a folded state (180 °) and then to the open state (0 °). Wherein, the arm of force value takes 0.07m. The rebound force of the same electronic device from the open state (0 °) to the folded state (180 °) is greater than the rebound force from the folded state (180 °) to the open state (0 °) due to the influence of the electronic device housing and the spindle mechanism.

As shown in fig. 15, compared to the comparative example, the rebound force of the electronic device 1 in the embodiment of the present application is significantly smaller than the rebound force of the electronic device 1 in the comparative example during bending, for example, the rebound moment of the electronic device 1 in the embodiment of the present application reaches about 0.129n.m at the maximum value when bending to 180 °, at this time, the rebound force of the electronic device 1 in the embodiment of the present application is about 1.84 n=0.129 n.m/0.07 m, the rebound moment of the electronic device in the comparative example reaches about 0.208n.m at the maximum value when bending to 180 °, at this time, the rebound force of the electronic device 1 in the comparative example is about 2.97 n=0.208n.07 m/0.07 m, and the rebound force of the electronic device 1 in the embodiment of the application is reduced by about 1.13N compared to the rebound force of the electronic device in the comparative example when bending to 180 °. Therefore, compared with the cover plate in the comparative example, the cover plate 100 in the embodiment of the application has the advantage of smaller rebound force in the bending process, so that the rebound force of the electronic device 1 in the embodiment of the application is smaller in the bending process, and the use experience of the electronic device 1 is better.

Various modifications and alterations of this application may be made by those skilled in the art without departing from the spirit and scope of this application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (15)

1. A cover plate for a display screen, the cover plate having a fold, the fold being bendable about a first axis, and the cover plate comprising at least one base layer, characterized in that:

in the bending portion of the cover plate, at least a partial region of at least a part of the base layers is configured as an unequal stretched base layer, and a modulus of the unequal stretched base layer in a first direction is smaller than a modulus of the unequal stretched base layer in a second direction; the first direction is perpendicular to the direction in which the first axis is located, and the second direction is parallel to the direction in which the first axis is located.

2. The cover sheet of claim 1, wherein in said bent portion of said cover sheet, at least a portion of the entire area of the base layer of said at least one base layer is provided as said unequal tensile base layer.

3. The cover plate of claim 2, further comprising a non-bent portion contiguous with the bent portion;

the at least one base layer covers the whole non-bent portion and the whole bent portion of the cover plate, and the whole area of at least part of the base layer of the at least one base layer is set as the unequal stretched base layer.

4. The cover plate of claim 2, further comprising a non-bent portion contiguous with the bent portion;

the at least one layer of base layer covers the whole non-bending part and the whole bending part of the cover plate, at least part of base layer corresponding to the non-bending part is connected with the unequal stretching base layer of the bending part, and the refractive index difference between the unequal stretching base layer of the bending part and the refractive index of the connected at least part of base layer of the non-bending part is smaller than 0.1.

5. The cover sheet according to claim 1, wherein in the bent portion of the cover sheet, the at least one base layer includes a plurality of base layers stacked in a thickness direction of the cover sheet, and at least a partial area of each of the plurality of base layers is provided as the unequal amount of the tensile base layer.

6. The cover sheet according to claim 1, wherein the at least one base layer includes a first base layer and a second base layer, and the cover sheet includes a hardened layer, the first base layer, a first adhesive layer, the second base layer, and a second adhesive layer, which are sequentially laminated in a thickness direction of the cover sheet;

At least one of the first base layer and the second base layer is configured as the unequal stretch base layer.

7. The cover plate of claim 6, wherein: the first adhesive layer and the second adhesive layer are both optical adhesive layers, and the modulus of the first adhesive layer is smaller than that of the second adhesive layer.

8. The cover sheet of claim 7, wherein the first adhesive layer is formed by curing a liquid optical adhesive and the second adhesive layer is provided as an optical adhesive tape.

9. The cover sheet of any one of claims 1-8, wherein the differential tensile base layer has a modulus in the first direction of 1GPa to 5GPa and the differential tensile base layer has a modulus in the second direction of greater than 5GPa.

10. The cover sheet of any one of claims 1-8 wherein the difference between the modulus of the unequal tensile substrate in the second direction and the modulus in the first direction is greater than 1GPa.

11. The cover sheet of any one of claims 1-8, wherein the unequal tensile base layer comprises at least one of a polymeric film layer and a glass layer.

12. The cover sheet of claim 11, wherein the unequal tensile base layer comprises at least one of a polyethylene terephthalate based film layer, a transparent polyimide based film layer, and an ultra-thin inorganic glass layer.

13. A display screen comprising a cover plate, a display layer and a support layer, which are laminated in this order, wherein the cover plate is as claimed in any one of claims 1 to 12.

14. An electronic device comprising the display screen of claim 13.

15. The electronic device of claim 14, wherein the electronic device further comprises:

the shell comprises a first middle frame, a second middle frame and a rotating shaft mechanism rotationally connecting the first middle frame and the second middle frame;

the display screen is arranged in the shell and covers the first middle frame, the second middle frame and the rotating shaft mechanism;

the bending part of the cover plate of the display screen and at least part of the rotating shaft mechanism are arranged in a lamination mode.