CN112967609A - Rollable display device - Google Patents

Referring to fig. 2 and fig. 3 in combination, fig. 2 is a schematic structural diagram of a rollable display device provided in an embodiment of the present invention in a flattened state, fig. 3 is a schematic structural diagram of the rollable display device provided in an embodiment of the present invention in a rolled state, where the

rollable display device

000 provided in this embodiment includes: a

flexible display screen

10 and at least one

roller

20; the

flexible display

10 includes a rolled state (as shown in fig. 3) in which the

flexible display

10 includes opposite rolled

ends

10A and

free ends

10B, and a flattened state (as shown in fig. 2) about which the

flexible display

10 can be wound on a

spool

20; the

rollable display device

000 further comprises at least one

stretching portion

30 located at the

free end

10B, wherein the

stretching portion

30 can drive the

flexible display screen

10 to unfold under the action of an external force; the

stretching portion

30 is more stretchable than the

flexible display

10.

Specifically, the

rollable display device

000 provided in this embodiment realizes the rollable storage function by winding the

flexible display screen

10 on the

spool

20, and optionally, in the rolled state, the

flexible display screen

10 includes a rolled

end

10A and a

free end

10B, where the rolled

end

10A is an end close to the

axial center

20A of the

spool

20, the

free end

10B is an end away from the outer surface of the

spool

20, and the

flexible display screen

10 can be gradually wound on the

spool

20 by winding the rolled

end

10A, that is, in the rolled state of the

rollable display device

000, the

free end

10B is located on a side of the rolled

end

10A away from the

axial center

20A of the

spool

20. The

rollable display device

000 of the present embodiment further comprises at least one

stretching portion

30 located at the

free end

10B, wherein the

stretching portion

30 is configured to drive the

flexible display screen

10 to unfold under an external force (such as a pulling force of a user), so as to achieve a flattened state of the

rollable display device

000. The stretchable degree of the

stretching portion

30 of the embodiment is greater than that of the

flexible display screen

10, and the stretchable degree of the

stretching portion

30 located at the

free end

10B is greater, so that the

stretching portion

30 can play a role in buffering stress, and can bear more tensile stress as much as possible, when the

rollable display device

000 is curled, the tensile force caused by the superposition of the thickness of the

flexible display screen

10 on the

flexible display screen

10 can be overcome as much as possible, which is beneficial to reducing the extrusion between the film layers of the

flexible display screen

10, and further, the influence on the display quality can be avoided.

It should be noted that, in this embodiment, the structure of the

stretching portion

30 is not specifically limited, for example, a material with strong stretching performance may be selected to make the

stretching portion

30, or a buffer structure may be disposed on the

stretching portion

30 to improve the stretching capability thereof, or other arrangement manners may also be adopted, and in specific implementation, the

stretching portion

30 may be disposed at the position of the

free end

10B of the

flexible display screen

10 according to actual requirements, and only it is required that the stretching degree of the

set stretching portion

30 is greater than the stretching degree of the

flexible display screen

10. The structure of the

flexible display screen

10 is not limited in this embodiment, and can be understood by referring to the structure of the flexible display screen in the rollable display device in the related art, which is not described in detail in this embodiment.

Alternatively, as shown in fig. 4, fig. 4 is another schematic structural diagram of the rollable display device provided in the embodiment of the present invention in a rolled state, the stretching degree of the

stretching portion

30 is greater than that of the

flexible display screen

10, and the stretching performance can be improved by arranging the

stretching portion

30 in a wave shape or a folded line shape.

In some alternative embodiments, please refer to fig. 5 and fig. 6 in combination, fig. 5 is a schematic plane structure diagram of a rollable display device in a flattened state according to an embodiment of the present invention, fig. 6 is a schematic sectional structure diagram of a direction a-a' in fig. 5, in this embodiment, the stretching

portion

30 includes a plurality of

display islands

310 arranged in an array and a stretching

bridge

320 connecting two

adjacent display islands

310, each

display island

310 includes at least one pixel unit (not shown), and the stretching

bridge

320 is a stretchable structure.

The present embodiment explains that the stretching

portion

30 located at the

free end

10B of the

flexible display screen

10 may be a stretchable display area, specifically, the stretching

portion

30 may include a plurality of

display islands

310 arranged in an array and a stretching

bridge

320 connecting two

adjacent display islands

310, the

display island

310 includes at least one pixel unit, the stretching

bridge

320 is a stretchable structure, the

display islands

310 are used for setting the pixel units to implement a display function, and the stretching

bridge

320 is used for implementing a stretchable function of the stretching

portion

30. The

display islands

310 may be separate structures, one end of the stretching

bridge

320 is connected to one

display island

310, and the other end of the stretching

bridge

320 is connected to another

display island

310, so as to connect two

adjacent display islands

310, that is, two

adjacent display islands

310 may be spaced apart from each other by a gap or a slit between two

adjacent display islands

310, and two

adjacent display islands

310 spaced apart from each other are connected by the stretching

bridge

320. In the embodiment, the stretching

portion

30 is configured to include a plurality of

display islands

310 arranged in an array and a stretching

bridge

320 connecting two

adjacent display islands

310, and the stretchability of the stretching

portion

30 is greater than that of the

flexible display screen

10 through the stretchability of the stretching

bridge

320, so that in the curling process of the

rollable display device

000, the stretching

portion

30 can play a role in buffering stress, and bears more stretching stress, and the tensile force on the

flexible display screen

10 caused by the thickness of the

flexible display screen

10 can be overcome as much as possible, thereby being beneficial to improving the display quality.

It should be noted that, in this embodiment, it is only to be noted that the

display island

310 includes at least one pixel unit, and the pixel unit is used to implement a display function, and in a specific implementation, the structure of the

display island

310 capable of implementing the display function is not limited thereto, and may also include other film structures and signal transmission lines, and the like.

In some alternative embodiments, please refer to fig. 2, fig. 3, fig. 7 and fig. 8 in combination, fig. 7 is a schematic partial enlarged view of a region B in fig. 2, fig. 8 is a schematic partial enlarged view of a region B in fig. 2, in this embodiment, the stretching

portion

30 includes a

buffer layer

301; in a direction Z perpendicular to the plane of the

flexible display screen

10, the

buffer layer

301 comprises a

first side

301A and a

second side

301B which are oppositely arranged; the

first side

301A or the

second side

301B is provided with a plurality of

grooves

40.

This embodiment illustrates that the stretching

portion

30 may be a single-film layer or a multi-film layer structure, wherein the stretching

portion

30 includes a

buffer layer

301, and the

buffer layer

301 includes a

first side

301A and a

second side

301B disposed opposite to each other along a direction Z perpendicular to a plane of the

flexible display

10; optionally, in fig. 7 of this embodiment, an example is illustrated in which, in a direction Z perpendicular to a plane of the

flexible display screen

10, the

first side

301A is located on the

second side

301B and is away from the

axis

20A of the

reel

20, and in a specific implementation, the

first side

301A and the

second side

301B of the

buffer layer

301, which are oppositely disposed, may be in other embodiments. The

first side

301A of the

buffer layer

301 of this embodiment is provided with a plurality of grooves 40 (as shown in fig. 7) or the

second side

301B of the

buffer layer

301 is provided with a plurality of grooves 40 (as shown in fig. 8), the

grooves

40 are formed on the surface or the bottom of the

buffer layer

301 of the stretching

portion

30, so that the stretching degree of the stretching

portion

30 is greater than that of the

flexible display screen

10, and meanwhile, the

grooves

40 are deformed when being stretched, and the deformation can be used as an elastic buffer structure of the stretching

portion

30, thereby overcoming the tensile force on the

flexible display screen

10 caused by the thickness superposition of the

flexible display screen

10, facilitating the reduction of the extrusion between the film layers of the

flexible display screen

10 when the stretching

portion

30 is pulled in the flattening process, further facilitating the improvement of the display effect, and avoiding the display failure.

It is understood that, in this embodiment, the position of the film layer of the

buffer layer

301 in the stretching

portion

30 is not specifically limited, and the

buffer layer

301 may be a film layer made of any stretchable material in the stretching

portion

30, for example, the material of the

buffer layer

301 may be polyimide, polyethylene terephthalate, thermoplastic polyurethane elastomer rubber, diphenylmethane diisocyanate, toluene diisocyanate, or the like, or may also be other materials, and the improvement of the stretchability is achieved by providing a structure on the buffer layer, which can improve the stretchability, and this embodiment is not specifically limited.

In some alternative embodiments, please refer to fig. 2, fig. 3 and fig. 9 in combination, fig. 9 is a schematic view of another partial enlarged structure of the region B in fig. 2, in which the

first side

301A and the

second side

301B of the

buffer layer

301 are both provided with a plurality of

grooves

40.

Optionally, the

grooves

40 include a

first groove

401 located on the

first side

301A and a

second groove

402 located on the

second side

301B; the orthographic projection of the

first groove

401 on the light-emitting surface of the

flexible display screen

10 and the orthographic projection of the

second groove

402 on the light-emitting surface of the

flexible display screen

10 are arranged in a staggered manner.

This embodiment illustrates that the stretching

portion

30 may be a single-film layer or a multi-film layer structure, wherein the stretching

portion

30 includes a

buffer layer

301, and the

buffer layer

301 includes a

first side

301A and a

second side

301B disposed opposite to each other along a direction Z perpendicular to a plane of the

flexible display

10; optionally, in fig. 7 of this embodiment, an example is illustrated in which, in a direction Z perpendicular to a plane of the

flexible display screen

10, the

first side

301A is located on the

second side

301B and is away from the

axis

20A of the

reel

20, and in a specific implementation, the

first side

301A and the

second side

301B of the

buffer layer

301, which are oppositely disposed, may be in other embodiments. The

first side

301A and the

second side

301B of the

buffer layer

301 of this embodiment are both provided with a plurality of

grooves

40, where the

grooves

40 include a

first groove

401 located on the

first side

301A and a

second groove

402 located on the

second side

301B, and an orthographic projection of the

first groove

401 on the plane where the

flexible display screen

10 is located and an orthographic projection of the

second groove

402 on the plane where the

flexible display screen

10 is located are arranged in an interlaced manner.

Groove

40 is all seted up through the surface and the bottom at the

buffer layer

301 of

tensile portion

30 to this embodiment, realize that the tensile degree of

tensile portion

30 is greater than the tensile degree of

flexible display screen

10, because

groove

40 can take place deformation when receiving tensile, this deformation can regard as the elastic buffer structure of

tensile portion

30, overcome the pulling force that causes

flexible display screen

10 because of the stack of

flexible display screen

10 thickness, be favorable to reducing the extrusion between

flexible display screen

10 rete when stretching

portion

30 is pulled in the exhibition flat-out process, and then be favorable to improving display effect, avoid showing inefficacy, still through the crisscross design of upper and lower of

first recess

401 and

second recess

402, the initial strength of tensile portion has been kept, the effect of the similar spring of

tensile portion

30 has still been reached, be favorable to increasing the tensile performance of

tensile portion

30.

In some alternative embodiments, please refer to fig. 2, fig. 3 and fig. 10 in combination, fig. 10 is a schematic view illustrating another planar structure of the rollable display device in a flattened state according to an embodiment of the present invention, in this embodiment, the

flexible display screen

10 includes a display area AA and a non-display area NA, optionally, the non-display area NA is disposed around the display area AA, and the stretching

portion

30 is at least located in the non-display area NA of the

flexible display screen

10.

This embodiment explains that the stretching

portion

30 at the

free end

10B of the

flexible display panel

10 may be at least disposed in the non-display area NA of the

flexible display panel

10, so as to avoid the influence of the large stretching degree of the stretching

portion

30 on the display effect when the stretching

portion

30 is disposed in the display area AA.

It can be understood that the stretching

portion

30 of the

rollable display device

000 of the present embodiment may be manufactured in the same process as the

flexible display screen

10, that is, in the process of manufacturing each film layer of the

flexible display screen

10, the film layer with higher stretchability of the

flexible display screen

10 itself may be extended to obtain the structure of the stretching

portion

30 or obtain the structure of the

buffer layer

301, which is not only beneficial to ensuring the overall stability of the stretching

portion

30 and the

flexible display screen

10, but also beneficial to improving the manufacturing efficiency.

In some alternative embodiments, referring to fig. 11, fig. 11 is another schematic structural diagram of the rollable display device provided in the embodiment of the present invention in a flattened state, in which in the embodiment, the

flexible display screen

10 includes a

flexible substrate

101, and the

buffer layer

301 and the

flexible substrate

101 are made of the same material in the same layer.

The present embodiment explains that the

flexible display screen

10 may include a

flexible substrate

101, and the

flexible substrate

101 may be used as a substrate, and may also be used as a backplane of the

rollable display device

000 for carrying various film structures of the

flexible display screen

10. Since the

flexible substrate

101 has high stretchability, the buffer layer 201 of the present embodiment may be made of the same material as the

flexible substrate

101 in the same layer, that is, in the process of manufacturing the

flexible display screen

10, the

flexible substrate

101 is further extended along the stretching direction (as the direction X in fig. 11) of the

rollable display device

000, so that the

flexible display screen

10 includes a first extending portion away from one side of the

reel

20, the first extending portion and the

flexible substrate

101 are made of the same material in the same layer, and are reused as the

buffer layer

301 of the stretching

portion

30, so that the stretching

portion

30 and the

flexible substrate

101 of the

flexible display screen

10 are an integrated connection structure, which is not only beneficial to ensuring the overall stability of the stretching

portion

30 and the

flexible display screen

10, but also beneficial to improving the process efficiency. Further, since the

flexible substrate

101 is further extended in the stretching direction of the

rollable display device

000 to form the first extension portion, which is made of the same material as the

flexible substrate

101 and is reused as the

buffer layer

301 of the stretching

portion

30, the

buffer layer

301 can prevent dust from falling on the adhesive layer (serving as a bonding and fixing function) exposed between the film layers during rolling, and thus, the adhesive failure of the adhesive layer can be avoided.

It can be understood that the

flexible substrate

101 of the

flexible display screen

10 of this embodiment may further include other film layers capable of implementing a display function, such as each insulating layer, a pixel defining layer, an organic

light emitting layer

100, and the like, which are not described in detail in this embodiment, and can be understood with reference to the structure of the flexible display screen in the related art.

It should be noted that, for clearly illustrating the technical solution of the present embodiment, the thickness of each film layer of the

flexible display

10 of the present embodiment is only schematically thicker, and in practical implementation, the thickness of the film layer such as the

flexible substrate

101 is much smaller than the thickness shown in the figure, so that in actual use, the step difference between the first extending portion (i.e., the buffer layer 301) generated by further extending the

flexible substrate

101 along the stretching direction of the

rollable display device

000 and the other

flexible display

10 is not particularly obvious.

In some alternative embodiments, referring to fig. 12, fig. 12 is another schematic structural diagram of the rollable display device provided in the embodiment of the present invention in a flattened state, in this embodiment, the

flexible display screen

10 includes a

flexible cover plate

102, and the

buffer layer

301 and the

flexible cover plate

102 are made of the same material in the same layer.

This embodiment illustrates that the

flexible display screen

10 may include a

flexible cover

102, and optionally, the

flexible cover

102 is located on a side of the organic

light emitting layer

100 away from the

flexible substrate

101, and is used to cover the organic

light emitting layer

100, so as to protect the entire

flexible display screen

10. Because the

flexible cover plate

102 has high stretchability, the buffer layer 201 of the present embodiment may be made of the same material as the

flexible cover plate

102 in the same layer, that is, in the process of manufacturing the

flexible display screen

10, the

flexible cover plate

102 is further extended along the stretching direction of the rollable display device 000 (for example, the direction X in fig. 12), so that the

flexible display screen

10 includes a second extending portion away from one side of the

reel

20, the second extending portion and the

flexible cover plate

102 are made of the same material in the same layer, and are reused as the

buffer layer

301 of the stretching

portion

30, so that the stretching

portion

30 and the

flexible cover plate

102 of the

flexible display screen

10 are an integrated connection structure, which is not only beneficial to ensuring the overall stability of the stretching

portion

30 and the

flexible display screen

10, but also beneficial to improving the process. Furthermore, since the

flexible cover

102 is further extended in the stretching direction of the

rollable display device

000 to form a second extension portion, which is made of the same material as the

flexible cover

102 and is reused as the

buffer layer

301 of the stretching

portion

30, the

buffer layer

301 can prevent dust from falling on the adhesive layer (serving as a bonding and fixing function) exposed between the film layers during rolling, and can prevent adhesive failure of the adhesive layer.

In some alternative embodiments, please refer to fig. 11 and 12 in combination with fig. 13 and 14, fig. 13 is a schematic diagram of a partially enlarged structure in a region C in fig. 11, and fig. 14 is a schematic diagram of a partially enlarged structure in a region D in fig. 12, in this embodiment, along a direction Z perpendicular to a plane of the

flexible display screen

10, a depth H1 of the

groove

40 is smaller than a thickness H2 of the

buffer layer

301.

This embodiment illustrates that the

buffer layer

301 includes a

first side

301A and a

second side

301B disposed opposite to each other in a direction Z perpendicular to a plane of the

flexible display screen

10; optionally, in both fig. 13 and fig. 14 of this embodiment, the

first side

301A is located on the

second side

301B away from the

axis

20A of the

reel

20 along the direction Z perpendicular to the plane of the

flexible display screen

10, and in specific implementation, the

first side

301A and the

second side

301B of the

buffer layer

301, which are oppositely disposed, may be implemented in other ways. Optionally, the

first side

301A and/or the

second side

301B of the

buffer layer

301 are provided with the

groove

40, and deformation generated when the

groove

40 is stretched serves as an elastic buffer structure of the stretching

portion

30, so as to overcome a tensile force on the

flexible display screen

10 due to the thickness of the

flexible display screen

10. Optionally, in fig. 13 and fig. 14 of this embodiment, a plurality of

grooves

40 are respectively disposed on the

first side

301A and the

second side

301B of the

buffer layer

301, where the

grooves

40 include a

first groove

401 located on the

first side

301A and a

second groove

402 located on the

second side

301B, and an orthographic projection of the

first groove

401 on the plane where the

flexible display screen

10 is located and an orthographic projection of the

second groove

402 on the plane where the

flexible display screen

10 is located are alternately disposed for illustration. In the embodiment, the depth H1 of the

groove

40 is smaller than the thickness H2 of the

buffer layer

301 along the direction Z perpendicular to the plane of the

flexible display screen

10, so that the

groove

40 penetrates through the

buffer layer

301 when the

flexible substrate

101 or the

flexible cover plate

102 is used as the

buffer layer

301, the performance of the

flexible substrate

101 or the

flexible cover plate

102 is affected, and the display effect of the

flexible display screen

10 is further affected.

In some alternative embodiments, please refer to fig. 15 and 16, fig. 15 is another schematic structural diagram of a rollable display device provided in an embodiment of the present invention in a flattened state, fig. 16 is a schematic partial enlarged structural diagram of the stretching portion in fig. 15, in this embodiment, the

flexible display screen

10 includes the

support layer

103, and the

buffer layer

301 and the

support layer

103 are made of the same layer.

This embodiment explains that the

flexible display screen

10 may further include a supporting

layer

103, and optionally, the supporting

layer

103 is located on a side of the organic

light emitting layer

100 away from the

flexible cover plate

102, and the supporting

layer

103 is located on a side of the

flexible substrate

101 away from the organic

light emitting layer

100, and is used for supporting a film layer of the entire

flexible display screen

10 to perform a supporting and protecting function. Optionally, the manufacturing material of the supporting

layer

103 may be stainless steel or copper, which plays a role in improving the supporting strength, and the supporting

layer

103 is provided with a plurality of hollow structures on class, so as to ensure the rollable performance thereof and to realize the rolling of the

flexible display screen

10. The buffer layer 201 of this embodiment may be made of the same material as the supporting

layer

103 in the same layer, that is, in the process of manufacturing the

flexible display screen

10, the supporting

layer

103 may be further extended along the stretching direction (e.g., the direction X in fig. 15) of the

rollable display device

000, so that the

flexible display screen

10 includes a third extending portion away from the side of the

reel

20, and the third extending portion and the supporting

layer

103 are made of the same material in the same layer and are reused as the

buffer layer

301 of the stretching

portion

30, so that the stretching

portion

30 and the supporting

layer

103 of the

flexible display screen

10 may be an integral connection structure, which is not only beneficial to ensuring the overall stability of the stretching

portion

30 and the

flexible display screen

10, but also beneficial to.

Optionally, as shown in fig. 15, the stretching

portion

30 of the present embodiment is not only located in the non-display area NA of the

flexible display panel

10, but also located in the display area AA of the

flexible display panel

10, and in the present embodiment, a third extending portion, where the

support layer

103 is further extended along a stretching direction (e.g., direction X in fig. 15) of the

rollable display device

000, and the

support layer

103 originally existing in the display area AA of the

flexible display panel

10 are used together as the

buffer layer

301, so that the area of the

buffer layer

301 is increased, and the stretching degree of the stretching

portion

30 can be further increased, and further, because the

support layer

103 is located on a side of the

flexible substrate

101 away from the organic

light emitting layer

100, the

buffer layer

301 is reused in the display area AA of the

support layer

103, and has a small influence on the.

In some alternative embodiments, please refer to fig. 15 and 17 in combination, fig. 17 is a schematic partial enlarged view of the stretching portion in fig. 15, in which the

first groove

401 and the

second groove

402 penetrate the

buffer layer

301 along a direction Z perpendicular to a plane of the

flexible display screen

10.

This embodiment explains that since the hardness of the material used for manufacturing the

support layer

103 is generally greater than the hardness of other film layers of the

flexible display screen

10 to provide a better supporting effect, when the

support layer

103 is used as the

buffer layer

301, the

first groove

401 and the

second groove

402 formed on the

buffer layer

301 may penetrate through the

buffer layer

301 along the direction Z perpendicular to the plane of the

flexible display screen

10. The material for manufacturing the

support layer

103 of the

flexible display screen

10 of this embodiment may be stainless steel or copper, and the like, which has a relatively high hardness, so that the

first groove

401 and the

second groove

402, which are provided on the

support layer

103, penetrate through the

support layer

103, and have a relatively small influence on the strength of the entire

flexible display screen

10, which is beneficial to increasing the stretchable degree, and meanwhile, the

first groove

401 and the

second groove

402, which penetrate through the

buffer layer

301, are also beneficial to increasing the crimpable degree of the

support layer

103, and are beneficial to better realizing the crimping performance of the

crimpable display device

000.

Optionally, when the

first groove

401 and the

second groove

402 penetrate through the

buffer layer

301 along a direction Z perpendicular to a plane of the

flexible display screen

10, other film structures of the

flexible display screen

10 except the supporting

layer

103 may cover the

first groove

401 and the

second groove

402, so as to ensure adhesion firmness of the supporting

layer

103 after the

groove

40 is formed.

In some alternative embodiments, referring to fig. 18, fig. 18 is a schematic plan view of a support layer of a rollable display device in a flattened state according to an embodiment of the present invention, in this embodiment, the stretching

portion

30 is not only located in the non-display area NA of the

flexible display

10, but also located in the display area AA of the

flexible display

10, the

flexible display

10 includes the

support layer

103, and the

buffer layer

301 and the

support layer

103 are made of the same layer. The

first grooves

401 and the

second grooves

402 extend through the

buffer layer

301 in a direction Z perpendicular to the plane of the

flexible display screen

10, i.e. the

grooves

40 extend through the

buffer layer

301. In the range of the non-display area NA, the distance between two

adjacent grooves

40 is D1; in the range of the display area AA, the distance between two

adjacent grooves

40 is D2, wherein D1 is more than or equal to D2.

This embodiment explains that, because the hardness of the material for manufacturing the

support layer

103 is high, when the

support layer

103 is reused as the

buffer layer

103, the

groove

40 may penetrate through the

buffer layer

301, and the opening range of the

groove

40 may be located within the non-display area NA and a part of the display area AA. Because the

grooves

40 formed in the supporting

layer

103 have a smaller influence on the display performance, the

grooves

40 are arranged in the embodiment at intervals to be arranged in a segmented and differentiated manner, specifically, in the range of the non-display area NA, the distance between two

adjacent grooves

40 is D1; in the display area AA range, the distance between two

adjacent grooves

40 is D2, wherein D1 is greater than or equal to D2, that is, the farther away from the scroll 20 (the closer to the region where the external force acts to stretch the flexible display screen 10), the larger the distance between two

adjacent grooves

40 is, so that sufficient tensile stress can be borne, when the

rollable display device

000 is rolled, the tensile force on the

flexible display screen

10 due to the overlapping of the thicknesses of the

flexible display screen

10 can be overcome as much as possible, the extrusion between the film layers of the

flexible display screen

10 is reduced, and the display quality is prevented from being affected, while in the display area AA range, the distance between two

adjacent grooves

40 is smaller, so that the rolling characteristic of the

rollable display device

000 can be considered, and the display quality of the display area AA can be ensured.

It can be understood that, in fig. 18 of this embodiment, the opening range of the

groove

40 is only located in the range of the non-display area NA and the partial display area AA, which is taken as an example for illustration, but not limited thereto, the whole surface of the

groove

40 may also be opened on the supporting

layer

103, and in particular implementation, the groove may be selectively arranged according to actual requirements.

In some alternative embodiments, referring to fig. 19, fig. 19 is a schematic plan view illustrating another planar structure of a support layer of a rollable display device provided in an embodiment of the present invention in a flattened state, in this embodiment, the stretching

portion

30 is not only located in the non-display area NA of the

flexible display

10, but also located in the display area AA of the

flexible display

10, the

flexible display

10 includes the

support layer

103, and the

buffer layer

301 and the

support layer

103 are made of the same layer. The

first grooves

401 and the

second grooves

402 extend through the

buffer layer

301 in a direction Z perpendicular to the plane of the

flexible display screen

10, i.e. the

grooves

40 extend through the

buffer layer

301. In the flattened state, the

flexible display screen

10 includes a first end M1 close to the

scroll

20 and a second end M2 far from the

scroll

20, and the distance D between two

adjacent grooves

40 gradually decreases along the direction in which the second end M2 points to the first end M1 (i.e., the direction G in fig. 19).

This embodiment explains that, because the hardness of the material for manufacturing the

support layer

103 is high, when the

support layer

103 is reused as the

buffer layer

103, the

groove

40 may penetrate through the

buffer layer

301, and the opening range of the

groove

40 may be located within the non-display area NA and a part of the display area AA. Since the

grooves

40 formed in the supporting

layer

103 have less influence on the display performance, the

grooves

40 are arranged at intervals in a stepwise differentiated manner in the present embodiment, specifically in a flattened state, the

flexible display screen

10 includes a first end M1 close to the

scroll

20 and a second end M2 far from the

scroll

20, a direction G along which the second end M2 points to the first end M1, a distance D between two

adjacent grooves

40 gradually decreases, i.e., the further away from the

spool

20, the greater the spacing between

adjacent grooves

40, and thus can carry sufficient tensile stress, when the

rollable display device

000 is rolled, the tension on the

flexible display screen

10 caused by the thickness of the

flexible display screen

10 is overcome as much as possible, the extrusion between the film layers of the

flexible display screen

10 is reduced, the display quality is prevented from being influenced, the closer to the winding

shaft

20, the smaller the distance between two

adjacent grooves

40, the better the curling characteristics of the

rollable display device

000.

Optionally, please refer to fig. 20 and 21 in combination, where fig. 20 is a schematic plane structure diagram of a buffer layer of a rollable display device provided in an embodiment of the present invention in a flattened state, and fig. 21 is a schematic plane structure diagram of another buffer layer of the rollable display device provided in an embodiment of the present invention in a flattened state, in this embodiment, the

groove

40 formed on the

buffer layer

301 of the stretching

portion

30 may be a

groove

40 in a row-and-column structure with a direction X as a row direction, or may also be a

groove

40 in a row-and-column direction with a direction X as a row direction and a direction Y as a column direction, and this embodiment is not particularly limited, and in specific implementation, the arrangement may be selected according to actual requirements.

In some alternative embodiments, referring to fig. 2, 9, 22 and 23 in combination, fig. 22 is a schematic view of a partial enlarged structure of a region B in fig. 2, and fig. 23 is a schematic view of a partial enlarged structure of a region B in fig. 2, in this embodiment, the

flexible display

10 includes a first cross section (not shown), which may be understood as a cross section of the

flexible display

10 cut in fig. 9, 22 and 23, the first cross section is perpendicular to a plane of the

flexible display

10, and the first cross section is parallel to a stretching direction of the rollable display device 000 (direction X in fig. 9, 22 and 23), and a pattern of the first groove and/or the second groove on the first cross section includes any one of a square shape (as shown in fig. 9), a triangular shape (as shown in fig. 22) and a semicircular shape (as shown in fig. 23). By the diversified design of the shape of the

groove

40, it is achieved that the

buffer layer

301 of the stretching

part

30 is more stretchable than the

flexible display screen

10.

In some alternative embodiments, please continue to refer to fig. 2 and fig. 9 in combination, in this embodiment, along the direction Z perpendicular to the plane of the flexible display screen, the depth of the

first groove

401 is equal to the depth of the

second groove

402, which are both H1; the spacing between two adjacent

first grooves

401 in the stretching direction of the rollable display device 000 (direction X in fig. 9) is equal to the spacing between two adjacent

second grooves

402, both L1.

In this embodiment, it is explained that, in the

groove

40 formed on the

buffer layer

301, along the direction Z perpendicular to the plane of the flexible display screen, the depth of the

first groove

401 is equal to the depth of the

second groove

402, which are both H1; the distance between two adjacent

first grooves

401 in the stretching direction (e.g., direction X in fig. 9) of the

rollable display device

000 is equal to the distance between two adjacent

second grooves

402, which are L1, so that the depth and the distance of the

grooves

40 formed on the

first side

301A and the

second side

301B of the

buffer layer

301 are the same, and the

grooves

40 formed on the

buffer layer

301 have a uniformly varying structure, similar to a principle structure of a spring, and are favorable for maintaining the strength stability of the

entire buffer layer

301.

In some alternative embodiments, please continue to refer to fig. 2 and 9 in combination, in this embodiment, the thickness H2 of the buffer layer ranges from 20 um to 50 um; the depth H1 of the

first groove

401 ranges from 0.1 um to 1um, and the depth H1 of the

second groove

402 ranges from 0.1 um to 1 um; the interval L1 between two adjacent

first grooves

401 ranges from 9 um to 10.5um, and the interval L1 between two adjacent

second grooves

402 ranges from 9 um to 10.5 um.

This embodiment further illustrates that the thickness H2 of the

buffer layer

301 of the stretching

portion

30 is in the range of 20-50um, so that it can be avoided that the

buffer layer

301 with too thick thickness cannot realize flexible curling, and it can be avoided that the

buffer layer

301 with too thin thickness cannot be provided with the

groove

40. In this embodiment, the buffer layer 301 is provided with a first groove 401 having a depth H1 ranging from 0.1 to 1um, and a second groove 402 having a depth H1 ranging from 0.1 to 1 um; the interval L1 between two adjacent first grooves 401 ranges from 9 um to 10.5um, the interval L1 between two adjacent second grooves 402 ranges from 9 um to 10.5um, thereby facilitating the grooves 40 formed in the buffer layer 301 having the thickness H2 in the range of 20-50um to realize that the stretchability of the stretching part 30 is greater than that of the flexible display 10, the deformation generated when the groove 40 is stretched can be used as an elastic buffer structure of the stretching part 30, so that the tensile force caused by the superposition of the thickness of the flexible display screen 10 on the flexible display screen 10 is overcome, the extrusion between the film layers of the flexible display screen 10 is reduced when the stretching part 30 is pulled in the flattening process, further, the display effect is improved, display failure is avoided, and the buffer layer 301 is prevented from being easily broken due to the fact that the grooves 40 with overlarge density and overlarge depth are formed in the buffer layer 301, and the tensile strength of the stretching portion 30 is affected.

In some alternative embodiments, please refer to fig. 24, fig. 25, and fig. 26 in combination, where fig. 24 is another schematic structural diagram of the rollable display device provided in the embodiment of the present invention in a flattened state, fig. 25 is another schematic structural diagram of the rollable display device provided in the embodiment of the present invention in a flattened state, fig. 26 is another schematic structural diagram of the rollable display device provided in the embodiment of the present invention in a flattened state, in this embodiment, the

flexible substrate

101 and the organic

light emitting layer

100 of the

flexible display screen

10 are fixed by adhering through the first adhesive layer 104 (as shown in fig. 24), the

flexible cover plate

102 and the organic

light emitting layer

100 are also fixed by adhering through the second adhesive layer 105 (as shown in fig. 25), the

support layer

103 and the

flexible substrate

101 are fixed by adhering through the third adhesive layer 106 (as shown in fig. 26), along the stretching direction X of the

rollable display device

000, the

first glue layer

104, the

second glue layer

105 and the

third glue layer

106 have end portions K at two ends thereof, and the end portions K may be inclined surfaces. Because the

flexible display screen

10 is in the process of being wound on the

reel

20, small dislocation is easily generated between the film layers due to winding extrusion, and therefore, the two end faces of the first

adhesive layer

104 and the second

adhesive layer

105 are two film layers which are inclined planes and can be better bonded and fixed in position dislocation.

In the present embodiment, the inclination angles of the inclined surfaces of the end portions K of the first

adhesive layer

104 and the second

adhesive layer

105 are not particularly limited, and in the specific implementation, the inclination angles may be selected according to the thickness of the adhesive layer, the thickness of the two film layers to be adhered, and the degree of curling.