Patent Description:
In recent years, a flexible display is widely applied to various foldable or rollable electronic devices because of characteristics such as lightness, thinness, and non-fragileness. When the foldable or rollable electronic device is unfolded, the flexible display is unfolded accordingly and has a relatively large display area, so that a user can view a large screen. When the foldable or rollable electronic device is folded or rolled, the flexible display is folded or rolled accordingly, so that the electronic device has a relatively small overall size and is easy to store and carry. However, in a process in which the flexible display repeatedly deforms with the electronic device, film layer separation or an adhesive failure is prone to occur, and reliability is relatively low.

<CIT> discloses a folding device of foldable electronic equipment. The device comprises a first main body, a second main body and a folding reset structure arranged between the first main body and the second main body, wherein the first main body and the second main body respectively comprise a free end and a connecting end, the folding reset structure comprises a bending part, two ends of the bending part are respectively connected with the connecting ends of the first main body and the second main body, and the first main body and the second main body can rotate by taking the bending part as a rotating shaft in the folding process. The foldable electronic equipment comprises a display screen and the folding device.

<CIT> relates to the technical field of display, in particular to a flexible display panel and a display device. The flexible display panel comprises a display device, a first functional layer and a second functional layer, wherein the first functional layer is formed at one side of the display device, the second functional layer is formed at another side of the display device. The modulus of the second functional layer is larger than the modulus of the first functional layer. The first functional layer comprises a first main body part and a first adjustment part, the first main body part and the first adjustment part are arranged in a curly direction of the flexible display panel, the modulus of the first adjustment part is larger than the modulus of the first main body part.

This application provides an electronic device. Reliability of a flexible display of the electronic device is relatively high.

According to a first aspect, this application provides an electronic device. The electronic device includes a housing assembly, a flexible display, and an adhesive layer assembly. The adhesive layer assembly is bonded between the housing assembly and the flexible display. The housing assembly includes a first housing, a rotating shaft, and a second housing that are connected in sequence. The rotating shaft can deform, so that the first housing and the second housing are unfolded or folded relative to each other. The flexible display includes a first non-bending part, a bending part, and a second non-bending part that are sequentially arranged, the first non-bending part faces the first housing, the bending part faces the rotating shaft, the second non-bending part faces the second housing, and when the first housing and the second housing are folded relative to each other to a closed state, the flexible display is located inside the housing assembly.

The adhesive layer assembly includes two strong adhesive layers and two weak adhesive layers. One strong adhesive layer and one weak adhesive layer are bonded between the first non-bending part and the first housing, and the other strong adhesive layer and the other weak adhesive layer are bonded between the second non-bending part and the second housing. The strong adhesive layer is close to the rotating shaft relative to the adjacent weak adhesive layer, and a stiffness of the strong adhesive layer is higher than a stiffness of the weak adhesive layer.

In a process in which the first housing and the second housing are folded relative to each other to drive the flexible display to be folded, the flexible display moves to be dislocated relative to the housing assembly due to stress generated by deformation of the bent flexible display. The flexible display may be close to or away from the rotating shaft relative to the housing assembly. In this case, the first non-bending part is bonded to the first housing by using the strong adhesive layer and the weak adhesive layer, and the strong adhesive layer is disposed close to the rotating shaft. The second non-bending part is bonded to the second housing by using the strong adhesive layer and the weak adhesive layer, and the strong adhesive layer is disposed close to the rotating shaft. In addition, the stiffness of the strong adhesive layer is higher than the stiffness of the weak adhesive layer. Therefore, when the flexible display is folded, a dislocation of the bending part of the flexible display relative to the housing assembly is relatively small, thereby reducing a risk of arching, film layer separation, or an adhesive failure of the flexible display in a process of unfolding the electronic device because the flexible display cannot be fully restored, and improving reliability of the flexible display. In addition, the first non-bending part can follow the bending part to be dislocated relative to the first housing, the second non-bending part can also follow the bending part to be dislocated relative to the second housing, and stress between the flexible display and the housing assembly is reduced, thereby reducing a risk of arching, film layer separation, or an adhesive failure of the flexible display because a force locally applied to the flexible display is excessively large, and improving the reliability of the flexible display. Therefore, the electronic device is provided with the adhesive layer assembly, to improve the reliability of the flexible display, so that a service life of the electronic device is relatively long, and user experience is better.

In a possible implementation, a modulus of the strong adhesive layer is greater than a modulus of the weak adhesive layer. In this implementation, the strong adhesive layer is made of a material with a relatively large modulus, and the weak adhesive layer is made of a material with a relatively small modulus, so that the stiffness of the strong adhesive layer is higher than the stiffness of the weak adhesive layer, to meet a bonding requirement of the flexible display and the housing assembly.

In a possible implementation, the strong adhesive layer is made of a double-sided adhesive material whose carrier is polyethylene terephthalate, or is made of a hot-melt adhesive material.

In a possible implementation, the weak adhesive layer is made of a double-sided adhesive material whose carrier is foam, or is made of a silica gel material.

In a possible implementation, the weak adhesive layer is made of a double-sided adhesive material without a carrier and with a relatively small modulus.

In a possible implementation, the weak adhesive layer is made of an acrylic-based adhesive material or a rubber-based adhesive material with a relatively small modulus.

In a possible implementation, the strong adhesive layer is in a continuous long strip shape. In this case, an area of the strong adhesive layer is relatively large, which helps implement a relatively high stiffness, to meet a bonding requirement.

In a possible implementation, the weak adhesive layer includes one or more hollow regions, to form a patterned structure. In this case, the stiffness of the weak adhesive layer is relatively low, and is lower than the stiffness of the strong adhesive layer, to meet a bonding requirement.

In a possible implementation, the weak adhesive layer is of a frame structure. The weak adhesive layer includes a hollow region located in the middle. A shape of a frame of the weak adhesive layer changes with shapes of the first non-bending part and the second non-bending part of the flexible display.

In a possible implementation, the weak adhesive layer is of a grid structure. The weak adhesive layer includes a plurality of hollow regions disposed at intervals. The plurality of hollow regions are arranged in an array. The plurality of hollow regions may alternatively be randomly arranged or arranged according to another arrangement rule. A shape of the hollow region may be a rectangle, or may be a circle, an ellipse, a triangle, a rhombus, or another regular or irregular pattern.

In a possible implementation, the weak adhesive layer includes a plurality of long adhesive strips distributed at intervals. A hollow region is formed between two adjacent long adhesive strips. Along side of the long adhesive strip may be a straight line or a wavy line.

In a possible implementation, the weak adhesive layer includes a plurality of adhesive blocks distributed at intervals. A hollow region is formed between two adjacent adhesive blocks. In this implementation, there is one hollow region in the weak adhesive layer, and the hollow region is approximately in a grid shape. All the adhesive blocks are separated by the hollow region.

A shape of the adhesive block may be a rectangle, or may be a circle, an ellipse, a triangle, a rhombus, or another regular or irregular pattern. The plurality of adhesive blocks may be arranged in an array, or the plurality of adhesive blocks may alternatively be arranged according to another arrangement rule or randomly arranged.

In a possible implementation, the weak adhesive layer includes a plurality of first adhesive blocks and a plurality of second adhesive blocks, an area of the second adhesive block is different from an area of the first adhesive block, and all the first adhesive blocks and the second adhesive blocks are distributed at intervals. A hollow region is formed between two adjacent adhesive blocks. In this implementation, there is one hollow region in the weak adhesive layer, and the hollow region is approximately in a grid shape. All the adhesive blocks are separated by the hollow region. The first adhesive block and the second adhesive block may have structures of a same shape but different sizes, or may have structures of different shapes. The first adhesive block and the second adhesive block may be rectangles, or may be circles, ellipses, triangles, rhombuses, or other regular or irregular shapes.

In a possible implementation, the weak adhesive layer is of a continuous whole-plane structure, and a shape of the weak adhesive layer changes with shapes of a support surface of the first housing and a support surface of the second housing. In this case, the weak adhesive layer may be made of a material with a relatively small modulus, so that a stiffness of the weak adhesive layer is lower than a stiffness of the strong adhesive layer.

In a possible implementation, a modulus of the strong adhesive layer is equal to a modulus of the weak adhesive layer, and an arrangement area of the strong adhesive layer is greater than an arrangement area of the weak adhesive layer. In this case, a stiffness of the strong adhesive layer is higher than a stiffness of the weak adhesive layer. The weak adhesive layer may be provided with a hollow region having a relatively large area, so that the area of the weak adhesive layer is less than the area of the strong adhesive layer.

In a possible implementation, the flexible display includes a support and a display panel that are disposed in a stacked manner, the support is bonded to the adhesive layer assembly, the support includes a first metal plate part, a second metal plate part, and a third metal plate part that are sequentially arranged, the first metal plate part is located in the first non-bending part, the second metal plate part is located in the bending part, the third metal plate part is located in the second non-bending part, and the second metal plate part can be bent.

In this implementation, the support is a continuous metal plate part, to provide support for the display panel, so that structural strength of the flexible display is relatively high. The second metal plate part can be bent, so that the flexible display can be smoothly bent.

In addition, dislocation can be performed between the support and the display panel, a dislocation requirement between inner-layer structures of the display panel can be reduced, so that the display panel is easier to bend, reliability is higher, and reliability of the flexible display is better.

In a possible implementation, a thickness of the second metal plate part is less than a thickness of the first metal plate part and less than a thickness of the third metal plate part. In this case, structural strength of the second metal plate part is reduced, which helps reduce a bending difficulty, so that the flexible display is easily bent, to improve user experience.

In a possible implementation, one or more hollow holes are disposed in the second metal plate part. In this case, structural strength of the second metal plate part is reduced, which helps reduce a bending difficulty, so that the flexible display is easily bent, to improve user experience.

In a possible implementation, the flexible display further includes a fastening adhesive layer bonded between the display panel and the support. The fastening adhesive layer is partially filled in one or more hollow holes of the second metal plate part, so that a part that is of the flexible display panel and that is located in the bending part has better flatness.

According to a second aspect, an embodiment of this application provides an electronic device. The electronic device includes a housing assembly, a flexible display, and an adhesive layer assembly. The adhesive layer assembly is bonded between the housing assembly and the flexible display. The housing assembly includes a first housing, a first rotating shaft, a second housing, a second rotating shaft, and a third housing that are connected in sequence. The first rotating shaft can deform, so that the first housing and the second housing are unfolded or folded relative to each other, and the second rotating shaft can deform, so that the second housing and the third housing are unfolded or folded relative to each other.

The flexible display includes a first non-bending part, a first bending part, a second non-b ending part, a second bending part, and a third non-bending part that are sequentially arranged. The first non-bending part faces the first housing, the first bending part faces the first rotating shaft, the second non-bending part faces the second housing, the second bending part faces the second rotating shaft, and the third non-bending part faces the third housing.

The adhesive layer assembly includes three strong adhesive layers and two weak adhesive layers. A stiffness of the strong adhesive layer is higher than a stiffness of the weak adhesive layer, the two weak adhesive layers are respectively fastened between the first housing and the first bending part and between the third housing and the third non-bending part, and the three strong adhesive layers are located between the two weak adhesive layers. The three strong adhesive layers are respectively fastened between the first housing and the first bending part, between the second housing and the second non-bending part, and between the third housing and the third non-bending part.

In a process in which the first housing, the second housing, and the third housing are folded relative to each other to drive the flexible display to be folded, the flexible display moves to be dislocated relative to the housing assembly due to stress generated by deformation of the bent flexible display. In this case, the first non-bending part is bonded to the first housing by using the strong adhesive layer and the weak adhesive layer, and the strong adhesive layer is disposed close to the first rotating shaft. The second non-bending part is bonded to the second housing by using the strong adhesive layer, the third non-bending part is bonded to the third housing by using the strong adhesive layer and the weak adhesive layer, and the strong adhesive layer is disposed close to the second rotating shaft. In addition, a stiffness of the strong adhesive layer is higher than a stiffness of the weak adhesive layer. Therefore, when the flexible display is folded, a dislocation of the second non-bending part of the flexible display relative to the second housing is relatively small, a dislocation of the first bending part relative to the first housing is relatively small, and a dislocation of the second bending part relative to the third housing is also relatively small, thereby reducing a risk of arching, film layer separation, or an adhesive failure of the flexible display in a process of unfolding the electronic device because the flexible display cannot be fully restored, and improving reliability of the flexible display. In addition, the first non-bending part can follow the first bending part to be dislocated relative to the first housing, the third non-bending part can also follow the second bending part to be dislocated relative to the third housing, and stress between the flexible display and the housing assembly is reduced, thereby reducing a risk of arching, film layer separation or an adhesive failure of the flexible display because a force locally applied to the flexible display is excessively large, and improving the reliability of the flexible display. Therefore, the electronic device is provided with the adhesive layer assembly, to improve the reliability of the flexible display, so that a service life of the electronic device is relatively long, and user experience is better.

In a possible implementation, when the first housing, the second housing, and the third housing are folded relative to each other to a closed state, the first housing is located between the second housing and the third housing. In this case, the electronic device is approximately in a rolled structure.

In a possible implementation, when the first housing, the second housing, and the third housing are folded relative to each other to a closed state, the third housing is located between the first housing and the second housing. In this case, the electronic device is approximately in a rolled structure.

In a possible implementation, when the first housing, the second housing, and the third housing are folded relative to each other to a closed state, the second housing is located between the first housing and the third housing. In this case, the electronic device is approximately S-shaped, and when the electronic device is in a closed state, the flexible display is partially folded inwards and partially exposed. Because the flexible display is in a shape when the electronic device is in a closed state, a bending radius difference between layer structures of the flexible display is relatively small, and dislocation statuses of the plurality of film layers of the flexible display at two ends are opposite, so that a dislocation requirement between the plurality of layer structures of the flexible display can be reduced, and reliability of the flexible display is improved.

Embodiments of this application provide a foldable electronic device and a rollable electronic device. The electronic device includes a flexible display, a housing assembly, and an adhesive layer assembly fastened between the flexible display and the housing assembly. The adhesive layer assembly includes a strong adhesive layer and a weak adhesive layer, and a stiffness of the strong adhesive layer is higher than a stiffness of the weak adhesive layer. By setting arrangement positions of the strong adhesive layer and the weak adhesive layer, in a process in which the flexible display deforms with the electronic device, a risk of film layer separation or an adhesive failure is relatively low, and reliability of the flexible display is relatively high. This helps prolong a service life of the electronic device and improve user experience.

Refer to <FIG> together. <FIG> is a schematic diagram of a structure of an electronic device <NUM> in an opened state according to an embodiment of this application. <FIG> is a schematic diagram of an internal structure of the electronic device <NUM> shown in <FIG> in a closed state.

The electronic device <NUM> is a foldable electronic product. The electronic device <NUM> may be a mobile phone, a tablet computer, an in-vehicle device, a wearable device, or the like. In the embodiment shown in <FIG>, descriptions are provided by using an example in which the electronic device <NUM> is a mobile phone. For ease of description, as shown in <FIG>, a width direction of the electronic device <NUM> is defined as an X axis, a length direction of the electronic device <NUM> is defined as a Y axis, a thickness direction of the electronic device <NUM> is defined as a Z axis, and the width direction X of the electronic device <NUM>, the length direction Y of the electronic device <NUM>, and the thickness direction Z of the electronic device <NUM> are perpendicular to each other.

In some embodiments, the electronic device <NUM> includes a housing assembly <NUM>, a flexible display <NUM>, and an adhesive layer assembly <NUM>. The adhesive layer assembly <NUM> is bonded between the housing assembly <NUM> and the flexible display <NUM>. In other words, the flexible display <NUM> is fastened to the housing assembly <NUM> by using the adhesive layer assembly <NUM>. In some embodiments, the housing assembly <NUM> includes a first housing <NUM>, a rotating shaft <NUM>, and a second housing <NUM> that are connected in sequence. The rotating shaft <NUM> can deform, so that the first housing <NUM> and the second housing <NUM> are unfolded or folded relative to each other. As shown in <FIG>, the first housing <NUM> and the second housing <NUM> can be unfolded relative to each other to be fully opened, so that the electronic device <NUM> is in an opened state. For example, when the first housing <NUM> and the second housing <NUM> are fully opened, the first housing <NUM> and the second housing <NUM> may be approximately <NUM>° (a slight deviation is also allowed, for example, <NUM>°, <NUM>°, or <NUM>°). As shown in <FIG>, the first housing <NUM> and the second housing <NUM> can be folded relative to each other to be closed, so that the electronic device <NUM> is in a closed state. For example, when the first housing <NUM> and the second housing <NUM> are closed, the first housing <NUM> and the second housing <NUM> are parallel (a slight deviation is also allowed). In other words, the electronic device <NUM> may switch between the opened state and the closed state through deformation of the rotating shaft <NUM>. In some embodiments, the electronic device <NUM> may further be in a partially opened state when the first housing <NUM> and the second housing <NUM> are unfolded/folded relative to each other through deformation of the rotating shaft <NUM>, that is, the first housing <NUM> and the second housing <NUM> are in an intermediate state between the fully opened state and the closed state. In some other embodiments, when the first housing <NUM> and the second housing <NUM> are fully opened, the first housing <NUM> and the second housing <NUM> may alternatively be approximately at an obtuse angle such as <NUM>°, <NUM>°, or <NUM>°. This is not strictly limited in this embodiment of this application.

The rotating shaft <NUM> may be connected to the first housing <NUM> in a movable or fixed manner, the rotating shaft <NUM> may be connected to the second housing <NUM> in a movable or fixed manner, and the movable connection may include a rotating connection and/or a sliding connection. The rotating shaft <NUM> may include a plurality of components that are connected to each other in a movable or fixed manner. For example, the rotating shaft <NUM> may include but is not limited to one or more of a hinge, a sliding block, a chute, a pin shaft, a connecting rod, and a swing rod. Alternatively, the rotating shaft <NUM> may be made of an elastic material, a memory alloy material, or the like. A specific implementation of the rotating shaft <NUM> is not strictly limited in this application. In embodiments of this application, "A and/or B" includes three cases: "A", "B", and "A and B".

In some embodiments, the flexible display <NUM> is configured to display an image. For example, the flexible display <NUM> may be an organic light-emitting diode (organic light-emitting diode, OLED) display, an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED) display, a mini light-emitting diode (mini light-emitting diode) display, a micro light-emitting diode (micro light-emitting diode) display, a micro organic light-emitting diode (micro organic light-emitting diode) display, or a quantum dot light-emitting diode (quantum dot light-emitting diode, QLED) display.

In some embodiments, the flexible display <NUM> includes a first non-bending part <NUM>, a bending part <NUM>, and a second non-bending part <NUM> that are sequentially arranged. The flexible display <NUM> may be of a continuous and integrated display structure, and the first non-bending part <NUM>, the bending part <NUM>, and the second non-bending part <NUM> each are a part of the flexible display <NUM>. The first non-bending part <NUM> faces the first housing <NUM>, the bending part <NUM> faces the rotating shaft <NUM>, and the second non-bending part <NUM> faces the second housing <NUM>. The flexible display <NUM> is unfolded or folded with the housing assembly <NUM>. As shown in <FIG>, when the first housing <NUM> and the second housing <NUM> are folded relative to each other to a closed state, the flexible display <NUM> is located inside the housing assembly <NUM>. For example, when the first housing <NUM> and the second housing <NUM> are folded relative to each other to a closed state, the first non-bending part <NUM> is parallel to the second non-bending part <NUM>, and the flexible display <NUM> is approximately U-shaped. In this embodiment, the flexible display <NUM> can be unfolded or folded with the housing assembly <NUM>. When the electronic device <NUM> is in an opened state, the flexible display <NUM> is unfolded and flattened, and can perform display in full screen, so that the electronic device <NUM> has a relatively large display area, to improve viewing experience of a user. When the electronic device <NUM> is in a closed state, the flexible display <NUM> is folded inside the housing assembly <NUM>, and a planar size of the electronic device <NUM> is relatively small, helping the user carry and store the electronic device.

In some embodiments, an adhesive layer of the adhesive layer assembly <NUM> may use one or more of a double-sided tape, an acrylic-based adhesive material, a rubber-based adhesive material, or a silicone-based adhesive material. A process for fastening the adhesive layer of the adhesive layer assembly <NUM> may be an ultraviolet (ultraviolet, UV) curing process, a moisture curing process, a heat curing process, an infrared curing process, or the like. A specific material and a specific forming process of the adhesive layer of the adhesive layer assembly <NUM> are not strictly limited in this application.

In some embodiments, the adhesive layer assembly <NUM> includes two strong adhesive layers <NUM> and two weak adhesive layers <NUM>. A stiffness of the strong adhesive layer <NUM> is higher than a stiffness of the weak adhesive layer <NUM>. In this embodiment of this application, "stiffness" is used to indicate a capability of the adhesive layer to resist elastic deformation when a force is applied to the adhesive layer. In other words, when being subject to an external force, the strong adhesive layer <NUM> is less likely to deform than the weak adhesive layer <NUM>. It should be understood that, in this embodiment of this application, the weak adhesive layer <NUM> is relatively low in stiffness compared with the strong adhesive layer <NUM>, and this is not limited to that the weak adhesive layer <NUM> has a very low stiffness. Similarly, compared with the weak adhesive layer <NUM>, the strong adhesive layer <NUM> has a relatively high stiffness, which is not limited to that the strong adhesive layer <NUM> has a very high stiffness.

One strong adhesive layer <NUM> and one weak adhesive layer <NUM> are bonded between the first non-bending part <NUM> and the first housing <NUM>, and the other strong adhesive layer <NUM> and the other weak adhesive layer <NUM> are bonded between the second non-bending part <NUM> and the second housing <NUM>. In the two adhesive layers fastened to the first non-bending part <NUM>, the strong adhesive layer <NUM> is close to the bending part <NUM> relative to the weak adhesive layer <NUM>. In the two adhesive layers fastened to the second non-bending part <NUM>, the strong adhesive layer <NUM> is close to the bending part <NUM> relative to the weak adhesive layer <NUM>. That is, the strong adhesive layer <NUM> is close to the rotating shaft <NUM> relative to the adjacent weak adhesive layer <NUM>.

In a process in which the first housing <NUM> and the second housing <NUM> are folded relative to each other to drive the flexible display <NUM> to be folded, the flexible display <NUM> moves to be dislocated relative to the housing assembly <NUM> due to stress generated by deformation of the bent flexible display <NUM>. For example, the flexible display <NUM> may be close to or away from the rotating shaft <NUM> relative to the housing assembly <NUM>. In this case, the first non-bending part <NUM> is bonded to the first housing <NUM> by using the strong adhesive layer <NUM> and the weak adhesive layer <NUM>, and the strong adhesive layer <NUM> is disposed close to the rotating shaft <NUM>. The second non-bending part <NUM> is bonded to the second housing <NUM> by using the strong adhesive layer <NUM> and the weak adhesive layer <NUM>, and the strong adhesive layer <NUM> is disposed close to the rotating shaft <NUM>. In addition, the stiffness of the strong adhesive layer <NUM> is higher than the stiffness of the weak adhesive layer <NUM>. Therefore, when the flexible display <NUM> is folded, a dislocation of the bending part <NUM> of the flexible display <NUM> relative to the housing assembly <NUM> is relatively small, thereby reducing a risk of arching, film layer separation, or an adhesive failure of the flexible display <NUM> in a process of unfolding the electronic device <NUM> because the flexible display <NUM> cannot be fully restored, and improving reliability of the flexible display <NUM>. In addition, the first non-bending part <NUM> can follow the bending part <NUM> to be dislocated relative to the first housing <NUM>, the second non-bending part <NUM> can also follow the bending part <NUM> to be dislocated relative to the second housing <NUM>, and stress between the flexible display <NUM> and the housing assembly <NUM> is reduced, thereby reducing a risk of arching, film layer separation, or an adhesive failure of the flexible display <NUM> because a force locally applied to the flexible display is excessively large, and improving the reliability of the flexible display <NUM>. Therefore, the electronic device <NUM> is provided with the adhesive layer assembly <NUM>, to improve the reliability of the flexible display <NUM>, so that a service life of the electronic device <NUM> is relatively long, and user experience is better.

It may be understood that when the flexible display <NUM> is folded or unfolded with the housing assembly <NUM>, the flexible display <NUM> moves slightly in a staggered manner relative to the housing assembly <NUM>, and a movement direction of the flexible display <NUM> is related to specific designs (for example, parameters such as a structure, a size, and a location) of the flexible display <NUM>, the adhesive layer assembly <NUM>, and the housing assembly <NUM>. For example, when the flexible display <NUM> is folded with the housing assembly <NUM>, the first non-bending part <NUM> of the flexible display <NUM> moves in a direction away from the rotating shaft <NUM> relative to the first housing <NUM>, and the second non-bending part <NUM> moves in a direction away from the rotating shaft <NUM> relative to the second housing <NUM>.

According to the applicant, by using a normal-temperature dynamic bending test structure, after bending and unfolding for <NUM>,<NUM> times, a fault probability of a display of a conventional electronic device <NUM> is <NUM>/<NUM>, but a fault probability of the flexible display <NUM> of the electronic device <NUM> in this application is <NUM>/<NUM>. Therefore, the reliability of the flexible display <NUM> of the electronic device <NUM> in this application is significantly improved.

In this embodiment of this application, there may be a plurality of embodiments for the strong adhesive layer <NUM> and the weak adhesive layer <NUM> in the adhesive layer assembly <NUM>, and a stiffness requirement may be met by using a material design, a shape design, and/or the like. The following provides an example for description.

In some embodiments, a modulus of the strong adhesive layer <NUM> is greater than a modulus of the weak adhesive layer <NUM>. In this embodiment of this application, a "modulus" is used to indicate a capability of a material to resist elastic deformation when a force is applied to the material. In this embodiment, the strong adhesive layer <NUM> is made of a material with a relatively large modulus, and the weak adhesive layer <NUM> is made of a material with a relatively small modulus, so that a stiffness of the strong adhesive layer <NUM> is higher than a stiffness of the weak adhesive layer <NUM>, to meet a bonding requirement of the flexible display <NUM> and the housing assembly <NUM>.

For example, the strong adhesive layer <NUM> may be made of a double-sided adhesive material whose carrier is polyethylene terephthalate and whose modulus is relatively large; or the strong adhesive layer <NUM> may also be made of a hot-melt adhesive material whose modulus is relatively large. In some other embodiments, the strong adhesive layer <NUM> may also be made of another material with a relatively large modulus.

For example, the weak adhesive layer <NUM> may be made of a double-sided adhesive material whose carrier is foam and whose modulus is relatively small; or the weak adhesive layer <NUM> may also be made of a silica gel material. In some other embodiments, the weak adhesive layer <NUM> may alternatively be made of a double-sided adhesive material without a carrier and with a relatively small modulus. In some other embodiments, the weak adhesive layer <NUM> may alternatively be made of an acrylic-based adhesive material or a rubber-based adhesive material with a relatively small modulus. In some other embodiments, the weak adhesive layer <NUM> may alternatively be made of another material with a relatively small modulus.

In some embodiments, as shown in <FIG>, the strong adhesive layer <NUM> is in a continuous long strip shape. In this case, an area of the strong adhesive layer <NUM> is relatively large, which helps implement a relatively high stiffness, to meet a bonding requirement.

In some embodiments, as shown in <FIG>, the weak adhesive layer <NUM> is of a continuous whole-plane structure. In this case, the weak adhesive layer <NUM> may be made of a material with a relatively small modulus, so that a stiffness of the weak adhesive layer <NUM> is lower than a stiffness of the strong adhesive layer <NUM>.

In some other embodiments, the weak adhesive layer <NUM> includes one or more hollow regions, to form a patterned structure. In this case, a stiffness of the weak adhesive layer <NUM> is relatively low, and is lower than a stiffness of the strong adhesive layer <NUM>, to meet a bonding requirement.

For example, refer to <FIG> shows a structure of the weak adhesive layer <NUM> of the electronic device <NUM> shown in <FIG> in some other embodiments. The weak adhesive layer <NUM> includes a plurality of long adhesive strips <NUM> distributed at intervals. A hollow region <NUM> is formed between two adjacent long adhesive strips <NUM>. The plurality of long adhesive strips <NUM> may be arranged in a width direction X of the electronic device <NUM>, and each long adhesive strip <NUM> extends in a length direction Y of the electronic device <NUM>. In some other embodiments, the plurality of long adhesive strips <NUM> may alternatively be arranged in another direction (for example, the length direction Y of the electronic device <NUM>), and each long adhesive strip <NUM> may alternatively extend in another direction (for example, the width direction X of the electronic device <NUM>). This is not strictly limited in this application. For example, when widths (namely, sizes in the width direction X of the electronic device <NUM>) of the first non-bending part <NUM> and the second non-bending part <NUM> are greater than or equal to <NUM> millimeters, a width of the hollow region <NUM> may be about <NUM> millimeters, for example, may be in a range of <NUM> millimeters to <NUM> millimeters.

Along side <NUM> of the long adhesive strip <NUM> is a straight line, to reduce manufacturing difficulty and manufacturing costs of the long adhesive strip <NUM>.

For example, refer to <FIG> shows a structure of the weak adhesive layer <NUM> of the electronic device <NUM> shown in <FIG> in some still other embodiments. The weak adhesive layer <NUM> in this embodiment includes most features of the weak adhesive layer <NUM> in the foregoing embodiments. The following mainly describes differences between the weak adhesive layer <NUM> in this embodiment and the weak adhesive layer <NUM> in the foregoing embodiments, and most same content is not described again.

The weak adhesive layer <NUM> includes a plurality of long adhesive strips (323a/323b) distributed at intervals. A hollow region <NUM> is formed between two adjacent long adhesive strips (323a/323b). Two long sides <NUM> of the plurality of long adhesive strips 323a located in the middle are triangular wavy lines, and one long side <NUM> of each of two long adhesive strips 323b located on the two sides is a triangular wavy line. In some other embodiments, one or more of four sides of the long adhesive strip (323a/323b) may be set as wavy lines. The sides of all or some of the plurality of long adhesive strips (323a/323b) may be set as wavy lines. In some other embodiments, the long side of the long adhesive strip (323a/323b) may alternatively be in an arc wavy shape, a rectangular wavy shape, or the like.

For example, refer to <FIG> shows a structure of the weak adhesive layer <NUM> of the electronic device <NUM> shown in <FIG> in some yet other embodiments. The weak adhesive layer <NUM> in this embodiment includes most features of the weak adhesive layer <NUM> in the foregoing embodiments. The following mainly describes differences between the weak adhesive layer <NUM> in this embodiment and the weak adhesive layer <NUM> in the foregoing embodiments, and most same content is not described again.

The weak adhesive layer <NUM> includes a plurality of adhesive blocks <NUM> distributed at intervals. A hollow region <NUM> is formed between two adjacent adhesive blocks <NUM>. In this embodiment, there is one hollow region <NUM> in the weak adhesive layer <NUM>, and the hollow region <NUM> is approximately in a grid shape. All the adhesive blocks <NUM> are separated by the hollow region <NUM>.

A shape of the adhesive block <NUM> may be a rectangle shown in <FIG>, or may be a circle, an ellipse, a triangle, a rhombus, or another regular or irregular pattern. This is not strictly limited in this application.

The plurality of adhesive blocks <NUM> may be arranged in an array. In some other embodiments, the plurality of adhesive blocks <NUM> may alternatively be arranged according to another arrangement rule or randomly arranged.

For example, refer to <FIG> shows a structure of the weak adhesive layer <NUM> of the electronic device <NUM> shown in <FIG> in some still yet other embodiments. The weak adhesive layer <NUM> in this embodiment includes most features of the weak adhesive layer <NUM> in the foregoing embodiments. The following mainly describes differences between the weak adhesive layer <NUM> in this embodiment and the weak adhesive layer <NUM> in the foregoing embodiments, and most same content is not described again.

The weak adhesive layer <NUM> includes a plurality of first adhesive blocks <NUM> and a plurality of second adhesive blocks <NUM>. An area of the second adhesive block <NUM> is different from an area of the first adhesive block <NUM>, and all the first adhesive blocks <NUM> and the second adhesive blocks <NUM> are distributed at intervals. A hollow region <NUM> is formed between two adjacent adhesive blocks (<NUM> and <NUM>). In this embodiment, there is one hollow region <NUM> in the weak adhesive layer <NUM>, and the hollow region <NUM> is approximately in a grid shape. All the adhesive blocks (<NUM> and <NUM>) are separated by the hollow region <NUM>.

The first adhesive block <NUM> and the second adhesive block <NUM> may have structures of a same shape but different sizes, or may have structures of different shapes. This is not strictly limited in this embodiment of this application. The first adhesive block <NUM> and the second adhesive block <NUM> may be rectangles shown in <FIG>, or may be circles, ellipses, triangles, rhombuses, or other regular or irregular shapes. This is not strictly limited in this embodiment of this application.

For example, refer to <FIG> shows a structure of the weak adhesive layer <NUM> of the electronic device <NUM> shown in <FIG> in some further embodiments. The weak adhesive layer <NUM> in this embodiment includes most features of the weak adhesive layer <NUM> in the foregoing embodiments. The following mainly describes differences between the weak adhesive layer <NUM> in this embodiment and the weak adhesive layer <NUM> in the foregoing embodiments, and most same content is not described again.

The weak adhesive layer <NUM> is of a grid structure. The weak adhesive layer <NUM> includes a plurality of hollow regions <NUM> disposed at intervals. The plurality of hollow regions <NUM> are arranged in an array. A shape of the hollow region <NUM> may be a rectangle shown in <FIG>, or may be a circle, an ellipse, a triangle, a rhombus, or another regular or irregular pattern. This is not strictly limited in this embodiment of this application.

In some other embodiments, the plurality of hollow regions <NUM> of the weak adhesive layer <NUM> may be arranged according to another arrangement rule or randomly arranged.

For example, refer to <FIG> shows a structure of the weak adhesive layer <NUM> of the electronic device <NUM> shown in <FIG> in some still further embodiments. The weak adhesive layer <NUM> in this embodiment includes most features of the weak adhesive layer <NUM> in the foregoing embodiments. The following mainly describes differences between the weak adhesive layer <NUM> in this embodiment and the weak adhesive layer <NUM> in the foregoing embodiments, and most same content is not described again.

The weak adhesive layer <NUM> is of a frame structure. The weak adhesive layer <NUM> includes a hollow region <NUM> located in the middle. A shape of a frame of the weak adhesive layer <NUM> changes with shapes of the first non-bending part <NUM> and the second non-bending part <NUM> (refer to <FIG>) of the flexible display <NUM>. For example, if the first non-bending part <NUM> is rectangular, the weak adhesive layer <NUM> is a rectangular frame.

In some other embodiments, a modulus of the strong adhesive layer <NUM> is equal to a modulus of the weak adhesive layer <NUM>, and an arrangement area of the strong adhesive layer <NUM> is greater than an arrangement area of the weak adhesive layer <NUM>. In this case, a stiffness of the strong adhesive layer <NUM> is higher than a stiffness of the weak adhesive layer <NUM>. The weak adhesive layer <NUM> may be provided with a hollow region having a relatively large area, so that the area of the weak adhesive layer <NUM> is less than the area of the strong adhesive layer <NUM>.

The foregoing describes several implementations of the weak adhesive layer <NUM> by using examples. It may be understood that the weak adhesive layer <NUM> may alternatively have another implementation, for example, another adhesive layer division manner or another arrangement pattern. This is not strictly limited in this application.

In this embodiment of this application, when the electronic device <NUM> is in a closed state, the bent flexible display <NUM> is slightly dislocated relative to the housing assembly <NUM>, and a plurality of layer structures of the flexible display <NUM> are also slightly dislocated relative to each other.

Refer to <FIG> is a schematic diagram of a structure of the flexible display <NUM> of the electronic device <NUM> shown in <FIG> in some embodiments. The flexible display <NUM> in <FIG> is in a closed state.

In some embodiments, the flexible display <NUM> includes a plurality of film layers that are disposed in a stacked manner, and adhesive layers, and each adhesive layer is located between any adjacent film layers located on two sides and is configured to implement bonding and fastening. For example, in the embodiment of <FIG>, the plurality of film layers and the plurality of adhesive layers are simplified into a first film layer <NUM>, a first adhesive layer <NUM>, a second film layer <NUM>, a second adhesive layer <NUM>, and a third film layer <NUM> that are sequentially disposed in a stacked manner. The third film layer <NUM> is configured to be fastened to the adhesive layer assembly <NUM>.

When the flexible display <NUM> is bent, due to different bending radiuses, layer structures of the flexible display <NUM> may move to be dislocated relative to each other, to maintain constant lengths of the layer structures. Dislocation deformation between materials of the plurality of layers is mainly absorbed by a low-modulus material of a layer (for example, an adhesive layer), to reduce a risk of film layer separation or an adhesive failure caused by the fact that the flexible display <NUM> cannot meet a corresponding dislocation movement requirement or stress strain.

In the embodiment of <FIG>, for example, at an end part of the flexible display <NUM>, the first film layer <NUM> protrudes relative to the second film layer <NUM>, the second film layer <NUM> protrudes relative to the third film layer <NUM>, and the first adhesive layer <NUM> and the second adhesive layer <NUM> deform. In other words, a layer structure inside the flexible display <NUM> is dislocated in a direction of approaching the end part of the flexible display <NUM>, relative to a layer structure outside the flexible display. A modulus of the first adhesive layer <NUM> and a modulus of the second adhesive layer <NUM> are less than a modulus of the first film layer <NUM>, a modulus of the second film layer <NUM>, and a modulus of the third film layer <NUM>. In other words, a stiffness of these adhesive layers is less than a stiffness of the film layers. Deformation of these adhesive layers enables smooth dislocation between the plurality of film layers, thereby reducing a risk of film layer separation or an adhesive failure of the flexible display <NUM>, and improving reliability of the flexible display <NUM>.

Refer to <FIG> is a schematic diagram of a structure of the flexible display <NUM> of the electronic device <NUM> shown in <FIG> in some other embodiments. The flexible display <NUM> in <FIG> is in a closed state.

In some embodiments, the flexible display <NUM> includes a support <NUM> and a display panel <NUM> that are disposed in a stacked manner. The support <NUM> is located on a non-display side of the display panel <NUM>. When the flexible display <NUM> is bent, the support <NUM> is located outside the display panel <NUM>. The support <NUM> is configured to bond the strong adhesive layer <NUM> and the weak adhesive layer <NUM>. The support <NUM> is fixedly bonded to the display panel <NUM> by using a fastening adhesive layer <NUM>.

The display panel <NUM> includes a plurality of film layers disposed in a stacked manner, and adhesive layers, and each adhesive layer is located between any adjacent film layers located on two sides and is configured to implement bonding and fastening. For example, in the embodiment of <FIG>, the plurality of film layers and the plurality of adhesive layers are simplified into a first film layer <NUM>, a first adhesive layer <NUM>, a second film layer <NUM>, a second adhesive layer <NUM>, and a third film layer <NUM> that are sequentially disposed in a stacked manner. The third film layer <NUM> is bonded to the support <NUM>.

In the embodiment in <FIG>, for example, at an end of the flexible display <NUM>, the first film layer <NUM> protrudes relative to the second film layer <NUM>, the second film layer <NUM> protrudes relative to the third film layer <NUM>, the third film layer <NUM> protrudes relative to the support <NUM>, and the fastening adhesive layer <NUM>, the second adhesive layer <NUM>, and the first adhesive layer <NUM> deform. In other words, a layer structure inside the flexible display <NUM> is dislocated in a direction of approaching the end part of the flexible display <NUM>, relative to a layer structure outside the flexible display. A modulus of the first adhesive layer <NUM>, a modulus of the second adhesive layer <NUM>, and a modulus of the fastening adhesive layer <NUM> are less than a modulus of the first film layer <NUM>, a modulus of the second film layer <NUM>, a modulus of the third film layer <NUM>, and a modulus of the support <NUM>. In other words, a stiffness of these adhesive layers is less than a stiffness of the film layers and a stiffness of the support <NUM>. Deformation of these adhesive layers enables smooth dislocation between the plurality of film layers and between the film layers and the support <NUM>, thereby reducing a risk of film layer separation or an adhesive failure of the flexible display <NUM>, and improving reliability of the flexible display <NUM>. In addition, because dislocation can be performed between the support <NUM> and the display panel <NUM>, a dislocation requirement between inner-layer structures of the display panel <NUM> can be reduced, so that the display panel <NUM> is easier to bend, and reliability is higher.

Refer to <FIG> is a schematic diagram of an internal structure of the flexible display <NUM> shown in <FIG> in another use state. The flexible display <NUM> in <FIG> is in an opened state.

In some embodiments, the support <NUM> includes a first metal plate part <NUM>, a second metal plate part <NUM>, and a third metal plate part <NUM> that are sequentially arranged. The first metal plate part <NUM> is located in the first non-bending part <NUM>, the second metal plate part <NUM> is located in the bending part <NUM>, the third metal plate part <NUM> is located in the second non-bending part <NUM>, and the second metal plate part <NUM> can be bent.

In this embodiment, the support <NUM> is a continuous metal plate part, to provide support for the display panel <NUM>, so that structural strength of the flexible display <NUM> is relatively high. The second metal plate part <NUM> can be bent, so that the flexible display <NUM> can be smoothly bent.

In some embodiments, one or more hollow holes <NUM> are disposed in the second metal plate part <NUM>. In this case, structural strength of the second metal plate part <NUM> is reduced, which helps reduce a bending difficulty, so that the flexible display <NUM> is easily bent, to improve user experience.

For example, the fastening adhesive layer <NUM> bonded between the display panel <NUM> and the support <NUM> can be partially filled in the one or more hollow holes <NUM> of the second metal plate part <NUM>, so that a part that is of the flexible display panel <NUM> and that is located in the bending part <NUM> has better flatness.

In some other embodiments, a thickness of the second metal plate part <NUM> is less than a thickness of the first metal plate part <NUM> and less than a thickness of the third metal plate part <NUM>. In this case, structural strength of the second metal plate part <NUM> is reduced, which helps reduce a bending difficulty, so that the flexible display <NUM> is easily bent, to improve user experience.

It may be understood that structural strength of a part that is of the support <NUM> and that is located in the bending part <NUM> of the flexible display <NUM> is relatively low, and structural strength of a part that is of the support <NUM> and that is located in a non-bending part <NUM> of the flexible display <NUM> is relatively high. The support <NUM> may have a plurality of design structures. This is not strictly limited in this application.

In some embodiments, a touch function may also be integrated into the flexible display <NUM>, and the flexible display <NUM> can generate a touch signal based on a touch operation of a user. For example, a touch layer is integrated into the display panel <NUM>, to integrate a display function and a touch function. Alternatively, the flexible display <NUM> may further include a touch panel. The touch panel and the display panel <NUM> are disposed in a stacked manner, and may be fastened to an out-light side of the display panel <NUM>.

In some embodiments, the electronic device <NUM> may further include a processor (not shown in the figure) mounted in the housing assembly <NUM>, and the flexible display <NUM> is coupled to the processor. The processor is configured to control a display operation of the flexible display <NUM>. The electronic device <NUM> further includes one or more functional modules that are mounted in the housing assembly <NUM> and that are coupled to the processor. The processor is further configured to control operations of the one or more functional modules. The functional module may include but is not limited to a camera module, a speaker module, a microphone module, a sensor module, a wireless communication module, and the like. A function of the processor of the electronic device <NUM>, a quantity of functional modules, a type of a functional module, and the like are not strictly limited in this application.

Refer to <FIG> is a schematic diagram of an internal structure of another electronic device <NUM> in a closed state according to an embodiment of this application. The electronic device <NUM> in this embodiment includes most features of the electronic device <NUM> in the foregoing embodiments. The following mainly describes differences between the electronic device <NUM> in this embodiment and the electronic device <NUM> in the foregoing embodiments, and most same content is not described again.

In some embodiments, when a first housing <NUM> and a second housing <NUM> of a housing assembly <NUM> are folded relative to each other to a closed state, the first housing <NUM> and the second housing <NUM> approach each other in a direction away from a rotating shaft <NUM>. For example, an end part of the first housing <NUM> connected to the rotating shaft <NUM> and an end part of the second housing <NUM> connected to the rotating shaft <NUM> are disposed at intervals, and an end part of the first housing <NUM> away from the rotating shaft <NUM> and an end part of the second housing <NUM> away from the rotating shaft <NUM> may be in contact with each other. In this embodiment, when the electronic device <NUM> is in a closed state, an overall size of the electronic device <NUM> is relatively small. This helps improve carrying and storing convenience.

When the first housing <NUM> and the second housing <NUM> are folded relative to each other to a closed state, a first non-bending part <NUM> and a second non-bending part <NUM> of a flexible display <NUM> approach each other in a direction away from a bending part <NUM>. The entire flexible display <NUM> is generally in a narrow and long water drop shape.

It may be understood that the electronic device <NUM> further includes an adhesive layer assembly fixedly disposed between the flexible display <NUM> and the housing assembly <NUM>. In a case of no conflict, the housing assembly <NUM>, the flexible display <NUM>, and the adhesive layer assembly of the electronic device <NUM> in this embodiment may all be designed with reference to related descriptions in the foregoing embodiments.

Refer to <FIG> and <FIG> together. <FIG> is a schematic diagram of an internal structure of still another electronic device <NUM> in an opened state according to an embodiment of this application, and <FIG> is a schematic diagram of an internal structure of the electronic device <NUM> shown in <FIG> in a closed state. The electronic device <NUM> in this embodiment includes most features of the electronic device <NUM> in the foregoing embodiments. The following mainly describes differences between the electronic device <NUM> and the electronic device <NUM> in the foregoing embodiments, and most same content is not described again.

The electronic device <NUM> includes a housing assembly <NUM>, a flexible display <NUM>, and an adhesive layer assembly <NUM>. The adhesive layer assembly <NUM> is bonded between the housing assembly <NUM> and the flexible display <NUM>.

The housing assembly <NUM> includes a first housing <NUM>, a first rotating shaft <NUM>, a second housing <NUM>, a second rotating shaft <NUM>, and a third housing <NUM> that are connected in sequence. The first rotating shaft <NUM> can deform, so that the first housing <NUM> and the second housing <NUM> are unfolded or folded relative to each other, and the second rotating shaft <NUM> can deform, so that the second housing <NUM> and the third housing <NUM> are unfolded or folded relative to each other. For example, when the first housing <NUM>, the second housing <NUM>, and the third housing <NUM> are relatively unfolded to an opened state, the electronic device <NUM> is approximately flat. When the first housing <NUM>, the second housing <NUM>, and the third housing <NUM> are relatively folded to a closed state (that is, the electronic device <NUM> is in a closed state), the third housing <NUM> is located between the first housing <NUM> and the second housing <NUM>. When one of the first housing <NUM> and the third housing <NUM> is opened relative to the second housing <NUM>, and the other is closed relative to the second housing <NUM>, the electronic device <NUM> is in a partially opened state.

The flexible display <NUM> includes a first non-bending part <NUM>, a first bending part <NUM>, a second non-bending part <NUM>, a second bending part <NUM>, and a third non-bending part <NUM> that are sequentially arranged. The first non-bending part <NUM> faces the first housing <NUM>, the first bending part <NUM> faces the first rotating shaft <NUM>, the second non-bending part <NUM> faces the second housing <NUM>, the second bending part <NUM> faces the second rotating shaft <NUM>, and the third non-bending part <NUM> faces the third housing <NUM>. The flexible display <NUM> may be of a continuous and integrated display structure. The first non-bending part <NUM>, the first bending part <NUM>, the second non-bending part <NUM>, the second bending part <NUM>, and the third non-bending part <NUM> are all parts of the flexible display <NUM>.

The adhesive layer assembly <NUM> includes three strong adhesive layers <NUM> and two weak adhesive layers <NUM>, a stiffness of the strong adhesive layer <NUM> is higher than a stiffness of the weak adhesive layer <NUM>, the two weak adhesive layers <NUM> are respectively fastened between the first housing <NUM> and the first bending part <NUM> and between the third housing <NUM> and the third non-bending part <NUM>, and the three strong adhesive layers <NUM> are located between the two weak adhesive layers <NUM>. The three strong adhesive layers <NUM> are respectively fastened between the first housing <NUM> and the first bending part <NUM>, between the second housing <NUM> and the second non-bending part <NUM>, and between the third housing <NUM> and the third non-bending part <NUM>.

For example, the adhesive layer assembly <NUM> includes a first strong adhesive layer 61a, a second strong adhesive layer 61b, a third strong adhesive layer 61c, a first weak adhesive layer 62a, and a second weak adhesive layer 62b. Both the first strong adhesive layer 61a and the first weak adhesive layer 62a are fastened between the first housing <NUM> and the first bending part <NUM>, and the first strong adhesive layer 61a is close to the first bending part <NUM> relative to the first weak adhesive layer 62a. The second strong adhesive layer 61b is fastened between the second housing <NUM> and the second non-bending part <NUM>, both the third strong adhesive layer 61c and the second weak adhesive layer 62b are fastened between the third housing <NUM> and the third non-bending part <NUM>, and the third strong adhesive layer 61c is close to the second bending part <NUM> relative to the second weak adhesive layer 62b. A stiffness of the first strong adhesive layer 61a, the second strong adhesive layer 61b, and the third strong adhesive layer 61c is higher than a stiffness of the first weak adhesive layer 62a and the second weak adhesive layer 62b.

In this embodiment, the flexible display <NUM> can be unfolded or folded with the housing assembly <NUM>. When the electronic device <NUM> is in an opened state, the flexible display <NUM> is unfolded and flattened, and can perform display in full screen, so that the electronic device <NUM> has a relatively large display area, to improve viewing experience of a user. When the electronic device <NUM> is in a closed state, the flexible display <NUM> is folded inside the housing assembly <NUM>, and a planar size of the electronic device <NUM> is relatively small, helping the user carry and store the electronic device.

In a process in which the first housing <NUM>, the second housing <NUM>, and the third housing <NUM> are folded relative to each other to drive the flexible display <NUM> to be folded, the flexible display <NUM> moves to be dislocated relative to the housing assembly <NUM> due to stress generated by deformation of the bent flexible display <NUM>. In this case, the first non-bending part <NUM> is bonded to the first housing <NUM> by using the strong adhesive layer <NUM> and the weak adhesive layer <NUM>, and the strong adhesive layer <NUM> is disposed close to the first rotating shaft <NUM>. The second non-bending part <NUM> is bonded to the second housing <NUM> by using the strong adhesive layer <NUM>, the third non-bending part <NUM> is bonded to the third housing <NUM> by using the strong adhesive layer <NUM> and the weak adhesive layer <NUM>, and the strong adhesive layer <NUM> is disposed close to the second rotating shaft <NUM>. In addition, a stiffness of the strong adhesive layer <NUM> is higher than a stiffness of the weak adhesive layer <NUM>. Therefore, when the flexible display <NUM> is folded, a dislocation of the second non-bending part <NUM> of the flexible display <NUM> relative to the second housing <NUM> is relatively small, a dislocation of the first bending part <NUM> relative to the first housing <NUM> is relatively small, and a dislocation of the second bending part <NUM> relative to the third housing <NUM> is also relatively small, thereby reducing a risk of arching, film layer separation, or an adhesive failure of the flexible display <NUM> in a process of unfolding the electronic device <NUM> because the flexible display <NUM> cannot be fully restored, and improving reliability of the flexible display <NUM>. In addition, the first non-bending part <NUM> can follow the first bending part <NUM> to be dislocated relative to the first housing <NUM>, the third non-bending part <NUM> can also follow the second bending part <NUM> to be dislocated relative to the third housing <NUM>, and stress between the flexible display <NUM> and the housing assembly <NUM> is reduced, thereby reducing a risk of arching, film layer separation or an adhesive failure of the flexible display <NUM> because a force locally applied to the flexible display is excessively large, and improving the reliability of the flexible display <NUM>. Therefore, the electronic device <NUM> is provided with the adhesive layer assembly <NUM>, to improve the reliability of the flexible display <NUM>, so that a service life of the electronic device <NUM> is relatively long, and user experience is better.

It may be understood that when the flexible display <NUM> is folded or unfolded with the housing assembly <NUM>, the flexible display <NUM> moves slightly in a staggered manner relative to the housing assembly <NUM>, and a movement direction of the flexible display <NUM> is related to specific designs (for example, parameters such as a structure, a size, and a location) of the flexible display <NUM>, the adhesive layer assembly <NUM>, and the housing assembly <NUM>. For example, when the flexible display <NUM> is folded with the housing assembly <NUM>, the second non-bending part <NUM> of the flexible display <NUM> does not move relative to the second housing <NUM>, the first non-bending part <NUM> moves in a direction away from the first rotating shaft <NUM> relative to the first housing <NUM>, and the third non-bending part <NUM> moves in a direction away from the second rotating shaft <NUM> relative to the third housing <NUM>.

In some embodiments, the strong adhesive layer <NUM> (namely, the second strong adhesive layer 61b) located between the second non-bending part <NUM> and the second housing <NUM> may be of a continuous whole-plane structure. In some other embodiments, the strong adhesive layer <NUM> (namely, the second strong adhesive layer 61b) located between the second non-bending part <NUM> and the second housing <NUM> may alternatively of a discontinuous structure. For example, the second strong adhesive layer 61b includes at least two adhesive strips. One adhesive strip is fastened to a side that is of the second non-bending part <NUM> and that is close to the first bending part <NUM>, and the other adhesive strip is fastened to a side that is of the second non-bending part <NUM> and that is close to the second bending part <NUM>. It may be understood that, for other designs of the strong adhesive layer <NUM> and the weak adhesive layer <NUM> in the electronic device <NUM>, refer to related descriptions in the foregoing embodiments.

Refer to <FIG> is a schematic diagram of a structure of the flexible display <NUM> of the electronic device <NUM> shown in <FIG>.

In some embodiments, the flexible display <NUM> includes a display panel and a support that are disposed in a stacked manner. The support is located on a non-display side of the display panel, and is fastened to the adhesive layer assembly <NUM>. For a specific structure, refer to the foregoing embodiments.

It may be understood that, for a related design of another structure of the electronic device <NUM> in this embodiment, refer to the foregoing embodiments.

Refer to <FIG> together. <FIG> is a schematic diagram of an internal structure of yet another electronic device <NUM> in a closed state according to an embodiment of this application. The electronic device <NUM> in this embodiment includes most features of the electronic device (<NUM>/<NUM>) in the foregoing embodiments. The following mainly describes differences between the electronic device <NUM> in this embodiment and the electronic device (<NUM>/<NUM>) in the foregoing embodiments, and most same content is not described again.

When a first housing <NUM>, a second housing <NUM>, and a third housing <NUM> of a housing assembly <NUM> are folded relative to each other to a closed state, the first housing <NUM> is located between the second housing <NUM> and the third housing <NUM>, and a first non-bending part <NUM> of a flexible display <NUM> is located between a second non-bending part <NUM> and a third non-bending part <NUM>. In this case, the electronic device <NUM> is approximately in a rolled structure.

Refer to <FIG> together. <FIG> is a schematic diagram of an internal structure of still yet another electronic device <NUM> in a closed state according to an embodiment of this application. The electronic device <NUM> in this embodiment includes most features of the electronic device (<NUM>/<NUM>) in the foregoing embodiments. The following mainly describes differences between the electronic device <NUM> in this embodiment and the electronic device (<NUM>/<NUM>) in the foregoing embodiments, and most same content is not described again.

When a first housing <NUM>, a second housing <NUM>, and a third housing <NUM> of a housing assembly <NUM> are folded relative to each other to a closed state, the second housing <NUM> is located between the first housing <NUM> and the third housing <NUM>, and a second non-bending part <NUM> of a flexible display <NUM> is located between a first non-bending part <NUM> and a second non-bending part <NUM>. In this case, the electronic device <NUM> is approximately S-shaped, and when the electronic device <NUM> is in a closed state, the flexible display <NUM> is partially folded inwards and partially exposed. For example, the first non-bending part <NUM> and a first bending part <NUM> of the flexible display <NUM> are exposed, and the second non-bending part <NUM>, a second bending part <NUM>, and the third non-bending part <NUM> are folded inwards. In some other embodiments, by designing a bending direction of the housing assembly <NUM>, the third non-bending part <NUM> and the second bending part <NUM> of the flexible display <NUM> may be exposed, and the second non-bending part <NUM>, the first bending part <NUM>, and the first non-bending part <NUM> may be folded inwards.

The flexible display <NUM> includes a plurality of film layers disposed in a stacked manner, and adhesive layers, and each adhesive layer is located between any adjacent film layers located on two sides and is configured to implement bonding and fastening. For example, in the embodiment of <FIG>, the plurality of film layers and the plurality of adhesive layers are simplified into a first film layer <NUM>, a first adhesive layer <NUM>, a second film layer <NUM>, a second adhesive layer <NUM>, and a third film layer <NUM> that are sequentially disposed in a stacked manner. The third film layer <NUM> is configured to be fastened to the adhesive layer assembly <NUM>.

In an embodiment of <FIG>, for example, at an end part of the first non-bending part <NUM> of the flexible display <NUM>, the third film layer <NUM> protrudes relative to the second film layer <NUM>, and the second film layer <NUM> protrudes relative to the first film layer <NUM>. At an end part of the third non-bending part <NUM> of the flexible display <NUM>, the first film layer <NUM> protrudes relative to the second film layer <NUM>, the second film layer <NUM> protrudes relative to the third film layer <NUM>, and the first adhesive layer <NUM> and the second adhesive layer <NUM> deform. In other words, a modulus of the first adhesive layer <NUM> and a modulus of the second adhesive layer <NUM> are less than a modulus of the first film layer <NUM>, a modulus of the second film layer <NUM>, and a modulus of the third film layer <NUM>. In other words, a stiffness of these adhesive layers is less than a stiffness of the film layers. Deformation of these adhesive layers enables smooth dislocation between the plurality of film layers, thereby reducing a risk of film layer separation or an adhesive failure of the flexible display <NUM>, and improving reliability of the flexible display <NUM>.

In this embodiment, because the flexible display <NUM> is in an S shape when the electronic device <NUM> is in a closed state, a bending radius difference between layer structures of the flexible display <NUM> is relatively small, and dislocation statuses of the plurality of film layers of the flexible display <NUM> at two ends are opposite, so that a dislocation requirement between the plurality of layer structures of the flexible display <NUM> can be reduced, and reliability of the flexible display <NUM> is improved.

Claim 1:
An electronic device (<NUM>), comprising a housing assembly (<NUM>), a flexible display (<NUM>), and an adhesive layer assembly (<NUM>), wherein the adhesive layer assembly (<NUM>) is bonded between the housing assembly (<NUM>) and the flexible display (<NUM>);
the housing assembly (<NUM>) comprises a first housing (<NUM>), a rotating shaft (<NUM>), and a second housing (<NUM>) that are connected in sequence, wherein the rotating shaft (<NUM>) can deform, so that the first housing (<NUM>) and the second housing (<NUM>) are unfolded or folded relative to each other;
the flexible display (<NUM>) comprises a first non-bending part (<NUM>), a bending part (<NUM>), and a second non-bending part (<NUM>) that are sequentially arranged, the first non-bending part (<NUM>) faces the first housing (<NUM>), the bending part (<NUM>) faces the rotating shaft (<NUM>), the second non-bending part (<NUM>) faces the second housing (<NUM>), and when the first housing (<NUM>) and the second housing (<NUM>) are folded relative to each other to a closed state, the flexible display (<NUM>) is located inside the housing assembly (<NUM>);
the adhesive layer assembly (<NUM>) comprises two strong adhesive layers (<NUM>) and two weak adhesive layers (<NUM>), wherein one strong adhesive layer (<NUM>) and one weak adhesive layer (<NUM>) are bonded between the first non-bending part (<NUM>) and the first housing (<NUM>), and the other strong adhesive layer (<NUM>) and the other weak adhesive layer (<NUM>) are bonded between the second non-bending part (<NUM>) and the second housing (<NUM>), wherein
the strong adhesive layer (<NUM>) is close to the rotating shaft (<NUM>) relative to the adjacent weak adhesive layer (<NUM>), and a stiffness of the strong adhesive layer (<NUM>) is higher than a stiffness of the weak adhesive layer (<NUM>).