CN111477110B

CN111477110B - Rollable display device

Info

Publication number: CN111477110B
Application number: CN202010423622.0A
Authority: CN
Inventors: 刘陆
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2022-09-09
Anticipated expiration: 2040-05-19
Also published as: CN111477110A

Abstract

The present disclosure relates to a rollable display device, including: the display module comprises a scroll and a rollable display module, wherein the scroll comprises an accommodating cavity and an opening, and the opening is communicated with the accommodating cavity; the display module capable of being curled comprises a display area, a peripheral area and a circuit area, wherein the peripheral area is positioned outside the display area, the circuit area is connected with the peripheral area, the circuit area is positioned in the accommodating cavity through the opening and is fixedly connected with the scroll, the peripheral area is positioned on the opening, and the display area can be curled on the scroll. The display device that can curl that this disclosure provided, circuit region are located the chamber that holds of spool, can reduce the length of low frame to avoid the chip of circuit region to receive the fragmentation inefficacy that the oppression leads to.

Description

Rollable display device

Technical Field

The disclosure relates to the technical field of display, in particular to a rollable display device.

Background

With the development of flexible display technology, display devices not only seek display effects such as high resolution, high contrast, and high screen ratio, but also have diversified requirements for the external appearance of the display devices, such as a special-shaped display panel and a rollable display panel. A rollable display panel is a flexible display panel, and future flexible displays will be developed in a direction of being foldable and rollable.

In industrial design, a narrow bezel is always the direction of display and design pursuit. In order to realize a narrow frame in a flexible display device, a display panel at an IC end is folded towards a non-display surface, and the IC at the IC end is bent behind a display area, so that the IC is easily pressed in a curling process, thereby causing the problem of IC fracture and failure.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of the present disclosure is to provide a display device that can curl, circuit region are located the chamber that holds of spool, can reduce the length of low frame to avoid the chip of circuit region to receive the cracked inefficacy that the oppression leads to.

According to an aspect of the present disclosure, there is provided a rollable display device including:

the reel comprises an accommodating cavity and an opening, and the opening is communicated with the accommodating cavity;

the curlable display module comprises a display area, a peripheral area and a circuit area, wherein the peripheral area is positioned outside the display area, the circuit area is connected with the peripheral area, the circuit area is positioned in the accommodating cavity through the opening and is fixedly connected with the scroll, the peripheral area is positioned on the opening, and the display area can be curled on the scroll.

In an exemplary embodiment of the present disclosure, the rollable display module includes:

and the support layer is at least partially positioned in the display area.

In an exemplary embodiment of the present disclosure, the rollable display module further includes:

the back film layer is arranged on one side of the supporting layer and at least partially positioned in the display area and the peripheral area, the back film layer comprises a hollowed area extending along the axial direction of the reel, and the hollowed area is positioned in the peripheral area;

the flexible display panel is arranged on one side of the supporting layer, which is far away from the supporting layer, and at least part of the flexible display panel is positioned in the display area and the peripheral area;

and the display functional layer is arranged on one side of the flexible display panel, which deviates from the back film layer, and at least part of the display functional layer is positioned in the display area.

the elastic layer is arranged on one side, deviating from the back film layer, of the flexible display panel and is located in the peripheral area.

In an exemplary embodiment of the present disclosure, an orthographic projection of the elastic layer on the flexible display panel covers an orthographic projection of the hollowed area on the flexible display panel.

In an exemplary embodiment of the present disclosure, a sidewall of the spool at the opening is located in the hollowed out region.

In an exemplary embodiment of the disclosure, the peripheral region is fixedly connected to the reel at the opening, and a side wall of the reel, to which the opening is fixedly connected to the rollable display module, is a smooth arc surface in a circumferential direction of the reel.

the first circuit layer is connected with the flexible display panel and is positioned in the circuit area;

and the chip is arranged on the first circuit layer.

In an exemplary embodiment of the present disclosure, the circuit area is attached to a sidewall of the receiving cavity.

In an exemplary embodiment of the present disclosure, the rollable display device further includes:

the support, the support is located on the spool, circuit area pass through the support with spool fixed connection.

The utility model provides a display device can curl has seted up in the spool and has held the cavity, and the circuit region that can curl the display module assembly can stretch into through the opening and hold the cavity, then through peripheral district connecting circuit region and display area, has avoided can folding circuit region to the non-display surface, and then avoids the IC of circuit region to be crooked to the back of display area to avoid producing the oppression to IC at the in-process that curls, overcome the cracked problem of inefficacy of IC. In addition, the bending area is formed and is positioned in the opening of the scroll, so that the width of the peripheral area in the curling direction of the rollable display module is relatively reduced, and the purpose of narrow frames is achieved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It should be apparent that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived by those of ordinary skill in the art without inventive effort.

Fig. 1 is a schematic diagram of a rolled display device provided by an embodiment of the present disclosure;

fig. 2 is a schematic view of a rollable display module according to an embodiment of the present disclosure;

fig. 3 is a schematic view of a rollable display module according to another embodiment of the present disclosure;

FIG. 4 is a side cross-sectional view of a rolled display device provided by one embodiment of the present disclosure;

fig. 5 is a side cross-sectional view of a rolled display device according to another embodiment of the present disclosure.

Description of reference numerals:

10. a reel 110, a containing cavity 120 and an opening;

20. the flexible display panel comprises a rollable display module, 210, a support layer, 220, a back film layer, 221, a hollow area, 230, a flexible display panel, 240, an elastic layer, 250, a display function layer, 260, a chip, 270, a chip on film, 280 and a flexible circuit board.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other components, devices, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

First, in the present exemplary embodiment, a rollable display device is provided, as shown in fig. 1 and fig. 2, the rollable display device includes a reel 10 and a rollable display module 20, the reel 10 includes an accommodating cavity 110 and an opening 120, and the opening 120 is communicated with the accommodating cavity 110; the rollable display module 20 includes a display area, a peripheral area outside the display area, and a circuit area connected to the peripheral area, the circuit area is located in the accommodating cavity 110 through the opening 120 and is fixedly connected to the reel 10, the peripheral area is located on the opening 120, and the display area can be rolled on the reel 10.

The rollable display device provided by the disclosure has the accommodating cavity 110 arranged in the scroll 10, the circuit area of the rollable display module 20 can extend into the accommodating cavity 110 through the opening 120, then the circuit area and the display area are connected through the peripheral area, the circuit area is prevented from being folded to a non-display surface, and further the IC in the circuit area is prevented from being bent to the back of the display area, so that the compression of the IC in the rolling process is avoided, and the problem of IC fragmentation failure is solved. In addition, by forming the bending region and locating it in the opening 120 of the scroll 10, the width of the peripheral region in the curling direction of the rollable display module 20 is relatively reduced, thereby achieving the purpose of a narrow bezel.

As shown in fig. 1, the rollable display module 20 is rectangular, the opening 120 of the reel 10 can be strip-shaped along the radial direction thereof, and the length of the opening 120 in the radial direction of the reel 10 is greater than the width of the rollable display module 20, so as to prevent the rollable display module 20 from generating wrinkles at the opening 120; the width of the opening 120 in the circumferential direction of the reel 10 is greater than the thickness of the rollable display module 20 to ensure that the circuit area of the rollable display module 20 can be assembled into the receiving cavity 110.

As shown in fig. 2, the rollable display module 20 includes a display area D, a peripheral area outside the display area D, and a circuit area a connected to the peripheral area. The peripheral area includes a frame area C and a bending area B, the bending area B is located on the opening 120 of the scroll 10, when the rollable display module 20 is rolled on the scroll 10, the bending area B is in a bending state, the frame area C is located outside the opening 120 of the scroll 10, and the display area D is connected to the frame area C.

Specifically, the rollable display module 20 includes: a support layer 210. At least a portion of the support layer 210 is positioned in the display region D. As shown in fig. 2, the support layer 210 is partially located in the display region D and partially located in the frame region C.

Specifically, the rollable display module 20 further includes: the flexible display comprises a back film layer 220, a flexible display panel 230 and a display function layer 250, wherein the back film layer 220 is arranged on one side of a support layer 210 and is at least partially positioned in a display area and a peripheral area, the back film layer 220 comprises a hollow area 221 extending along the axial direction of a scroll 10, and the hollow area 221 is positioned in the peripheral area; the flexible display panel 230 is disposed on a side of the support layer 210 facing away from the support layer 210, and at least partially located in the display area and the peripheral area; the display function layer 250 is disposed on a side of the flexible display panel 230 facing away from the back film layer 220, and at least partially located in the display area.

Further, as shown in fig. 2, a portion of the back film layer 220 may extend from the peripheral region to the circuit region a; the flexible display panel 230 and the backsheet layer 220 may have the same length, that is, the flexible display panel 230 is located on the surface of the backsheet layer 220; the display function layer 250 covers the display region D and is partially located in the bezel region C.

When the rollable display module 20 is in a rolled state, the support layer 210 is rolled on the inner side, and the flexible display panel 230 is rolled on the outer side. The support layer 210 has a certain thickness, and after the support layer 210 is curled, the flexible display panel 230 and the back film layer 220 can be curved and curled outside, so that the flexible display panel 230 and the back film layer 220 can be prevented from being folded and the usability of the rollable display module 20 can be prevented from being affected. The material of the supporting layer 210 includes a metal material, such as a dense metal, such as tungsten and iron, or stainless steel and an alloy material containing a metal, such as tungsten and iron. Of course, the support layer 210 may also be a polymer material, such as a film material, e.g., polyester, polyethylene, optical adhesive, or pressure sensitive adhesive. Illustratively, the thickness of the support layer 210 may be 50 μm to 200 μm, for example, 50 μm, 70 μm, 100 μm, 130 μm, 170 μm, 200 μm, etc., which are not enumerated herein. Of course, it may also be less than 50 μm or greater than 200 μm, as the present disclosure is not limited thereto.

For the light and thin flexible display panel 230, when the flexible display panel 230 is curled and then flattened again, the flexible display panel 230 can be freely curled due to the self inertia of the flexible display panel 230, the support layer 210 is arranged below the flexible display panel 230, the density of the support layer 210 can be greater than that of the flexible display panel 230, when the flexible display panel 230 is in the unfolded state, the density of the support layer 210 is large, the weight is large, the support layer 210 is not easy to be freely curled due to the curling inertia, the support layer 210 can keep a good flattened state, the support layer 210 in the flattened state can apply an acting force perpendicular to the surface direction of the flexible display panel 230 to the flexible display panel 230 due to the self gravity, the acting force can be directly applied to the contact part of the flexible display panel 230 and the support layer 210, and the acting force can resist the self inertia force of the flexible display panel 230, the flexible display panel 230 is kept in a flat state, the light and thin flexible display panel 230 is prevented from freely curling due to inertia generated by a curling state, the stability of the unfolding state of the flexible display panel 230 is ensured, the flexible display panel 230 is prevented from curling or being damaged due to the fact that the flexible display panel is bent, and the performance stability of the rollable display module 20 is improved. Meanwhile, when the flexible display panel 230 is in the unfolded state for displaying, the flexible display panel 230 can reach a good flat state, and can provide good use experience and viewing effect. When the flexible display panel 230 is in a curled state, the support layer 210 is curled at the inner side, so that the flexible display panel 230 is supported and protected, and the flexible display panel 230 can be ensured to be curled in an arc shape.

The back film layer 220 has a certain flexible bending capability to achieve the purpose of reducing strain when the flexible display panel 230 is curled, and the back film layer 220 may be made of a polymer, a plastic, and the like, such as polyamide, polyethylene terephthalate (PET), and the like, which is not limited by the present disclosure. Through set up notacoria layer 220 under flexible display panel 230, when flexible display panel 230 buckles, because flexible display panel 230 includes fragile electron device layer, the thin layer can support flexible display panel 230, reduces flexible display panel 230's meeting an emergency to avoid flexible display panel 230 to meet an emergency too big when curling, improved the reliability that can curl display module assembly 20.

Illustratively, in the rolling direction of the flexible display panel 230, the width H of the hollowed area 221 of the backing film layer 220 is set according to the wall thickness of the reel 10 at the opening 120, the sidewall of the reel 10 at the opening 120 is located in the hollowed area 221, and the groove formed by the hollowed area 221 can wrap the sidewall. As shown in fig. 2, the peripheral region is fixedly connected to the reel 10 through bonding or the like on the opening 120, in the circumferential direction of the reel 10, the sidewall of the opening 120 fixedly connected to the rollable display module 20 is a smooth arc, the smooth arc protrudes toward the gap of the reel 10 at the opening 120, and in the radial direction of the reel 10, the wall thickness of the sidewall is D, and then the relationship between the span H and the wall thickness D of the hollow region 221 may be: h is more than or equal to 1/2 pi D. When the wall thickness is 2mm to 3mm, the width of the hollowed-out area 221 may be 3mm to 5 mm. Of course, the width of the hollowed-out area 221 may also be less than 3mm or greater than 5mm, which is not limited by the present disclosure.

In addition, as shown in fig. 3, the sidewall of the opening 120 fixedly connected to the rollable display module 20 may be a plane, and only the outer corner is formed with an arc-shaped chamfer, which does not limit the sidewall of the opening 120 fixedly connected to the rollable display module 20. The rollable display module 20 can also be fixedly connected to the opposite sidewalls of the opening 120 by bonding, or only fixedly connected to the spool 10 through the circuit region. By way of example, the bonding may be performed using black glue.

As shown in fig. 2, in the curling direction of the flexible display panel 230, the distance between the orthographic projection of the support layer 210 on the flexible display panel 230 and the side edge of the hollowed area 221 adjacent to the orthographic projection on the flexible display panel 230 is 100 μm-500 μm, such as 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, etc., which is not listed here. Of course, it may also be less than 100 μm or greater than 500 μm, which is not limited by this disclosure.

The portion of the flexible display panel 230 in the display region D includes an electronic device layer and a light emitting device layer, the electronic device layer includes a plurality of thin film transistors for controlling the light emitting device to be turned on and off, and the thin film transistors include an active layer, a gate electrode, a source electrode, and a drain electrode. The anode may be connected to a source or a drain of the thin film transistor, which may be of a top gate structure or a bottom gate structure, depending on the type of transistor. The light emitting device layer may include an anode, a light emitting layer, and a cathode, which are sequentially stacked. The light emitting device may have a top emission structure or a bottom emission structure, and the top emission structure is exemplified, and the anode is a reflective electrode, is usually made of a metal material, and may be formed of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a mixture thereof. For example, the anode may comprise a structure of ITO-Ag-ITO (indium tin oxide-silver-indium tin oxide); the light emitting layer may include a red light emitting layer, a green light emitting layer, and a blue light emitting layer, however, the present disclosure is not limited thereto; the cathode is a transparent electrode and may include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO) or indium oxide (In) ₂ O ₃ ) And the like. The anode can effectively reflect light emitted from the light emitting layer to the light emitting side, improving light emitting efficiency, and holes injected from the anode and electrons injected from the cathode combine in the light emitting pixel layer to generate excitons which fall from an excited state to a ground state and generate light. The light emitting device may further include one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer. A hole injection layer and/or a hole transport layer may be disposed between the anode and the light emitting layer. An electron injection layer and/or an electron transport layer may be disposed between the cathode and the light emitting layer.

In addition, a thin film encapsulation layer is further disposed over the cathode of the flexible display panel 230, and the thin film encapsulation layer may be a combined encapsulation of a plurality of organic thin films and inorganic thin films, for example, may be an alternate lamination structure of organic thin films and inorganic thin films. The organic film is usually a polymer material such as epoxy, phenolic, polyester, etc.; the inorganic thin film may be made of silicon nitride, silicon oxynitride, metal oxide, or the like. The thin film packaging layer can effectively prevent water and oxygen from corroding the light-emitting device, so that the service life of the light-emitting device is prolonged, the light-emitting device is thin, and the light-emitting device has good bending or curling performance.

The display function layer 250 may include a polarizing layer, a light extraction layer, and a cover plate stacked in sequence, wherein when the external ambient light enters the flexible display panel 230, the light extraction layer is incident through the cover plate, and then the light extraction layer is incident into the polarizing layer, only the polarized light propagating along a certain direction in the polarizing layer passes through and continues to be transmitted, and when the polarized light meets the reflective layer (e.g., the reflective electrode), the polarized light is reflected back to the polarizing layer. Since the polarization direction of the polarized light is changed (perpendicular to the original polarization direction) when the polarized light is reflected, the polarized light cannot pass through the polarizing layer to be emitted when the polarized light enters the polarizing layer again. Meanwhile, in this embodiment, the light extraction layer is disposed inside the display function layer 250, and is closer to the flexible display panel 230 than in the prior art, so that the light extraction rate of the flexible display panel 230 can be increased, and the display brightness of the flexible display panel 230 can be obviously increased under the same driving power. Of course, the display function layer 250 is not limited to only include the polarizing layer, the light extraction layer and the cover plate, and the display function layer 250 may further include other layers having a display function, which is not limited in this disclosure.

Specifically, the rollable display module 20 further includes: an elastic layer 240. The elastic layer 240 is disposed on a side of the flexible display panel 230 facing away from the back film layer 220 and located in the peripheral region. The elastic layer 240 and the hollow area 221 are located in the peripheral region, and the elastic layer 240 is located on the flexible display panel 230 at a position corresponding to the hollow area 221. When flexible display panel 230 buckles, elastic layer 240 has certain flexible bending ability, and elastic layer 240 can wrap up flexible display panel 230 at the bending part of opening 120, can reduce flexible display panel 230's the meeting an emergency to avoid flexible display panel 230 to meet an emergency too big when curling, improved the reliability of display module assembly 20 that can curl. The elastic layer 240 may be made of other materials such as polymers, plastics, etc., and exemplary materials include polyamide, polyethylene terephthalate (PET), etc.

The orthographic projection of the elastic layer 240 on the flexible display panel 230 covers the orthographic projection of the hollowed area 221 on the flexible display panel 230, that is, there is no part supported by the back film layer 220 below the display panel, the elastic layer 240 is arranged above the part, and the back film layer 220 and the elastic layer 240 are matched to form protection for the flexible display panel 230 and reduce bending stress. Illustratively, in the curling direction of the flexible display panel 230, the distance between the orthographic projection of the elastic layer 240 on the flexible display panel 230 and the side adjacent to the orthographic projection of the hollowed area 221 on the flexible display panel 230 is 0.5mm-2mm, such as 0.5mm, 1mm, 1.5mm, 2mm, etc., which is not listed here. Of course, it may also be less than 0.5mm or greater than 2mm, as the present disclosure is not limited thereto. Illustratively, the thickness of the elastic layer 240 may be 30 μm to 150 μm, for example, 30 μm, 50 μm, 90 μm, 120 μm, 130 μm, 150 μm, etc., which are not enumerated herein. Of course, it may also be less than 30 μm or greater than 150 μm, as the present disclosure is not limited thereto.

Specifically, the rollable display module 20 further includes: a first circuit layer and a chip. The first circuit layer is connected to the flexible display panel 230 and located in the circuit region, and the chip is disposed on the first circuit layer. The chip is located in the circuit region, and the circuit region a is located in the accommodating cavity 110 of the scroll 10, so that the problem that the circuit region is folded towards the non-display surface, and further the IC in the circuit region is prevented from being bent to the back of the display region, so that the IC is prevented from being pressed in the curling process, and the problem that the IC is cracked and fails is solved.

For example, as shown in fig. 2, the first circuit layer is a Chip On Film (COF)270, and the circuit region of the rollable display module 20 includes: the flexible display panel 230 includes a chip on film 270, a chip (IC)260 and a flexible circuit board (FPC)280, one end of the chip on film 270 is connected to the flexible circuit board 280, the chip 260 is disposed on the chip on film 270, the chip 260 can be located on one side of the chip on film 270 away from or toward the flexible display panel 230, and the flexible circuit board 280 is connected to the other end of the chip on film 270.

For example, as shown in fig. 3, the circuit region of the rollable display module 20 includes: the flexible circuit board 280 is connected to the chip 260, the flexible circuit board 280 is connected to the flexible display panel 230, and the chip 260 is disposed on the flexible display panel 230.

For example, as shown in fig. 4, the circuit area a is attached to the sidewall of the receiving cavity 110. The flip chip 270 and the flexible circuit board 280 in the circuit area a may be bonded to the sidewall of the accommodating cavity 110 through a glue such as black glue, so as to fix the circuit area on the reel 10. Wherein, spool 10 is cylindricly, holds cavity 110 and also is cylindricly, and circuit area A pastes and is the arc behind the lateral wall of holding cavity 110, and the radius of the arc lateral wall of holding cavity 110 is great usually, can avoid IC to receive crooked influence.

For example, the rollable display device further includes: the support, the support is located spool 10, and circuit area passes through support and spool 10 fixed connection. As shown in fig. 5, the flip-chip film 270 and the flexible circuit board 280 are located in the accommodating cavity 110, and the flip-chip film 270 is bent by 180 ° at a position where the chip 260 is not disposed, so as to facilitate the layout of the circuit area a in the accommodating cavity 110. In addition, the flip chip 270 may be bent several times at a position where the chip 260 is not disposed, which is not limited in the present disclosure.

The example, but display device that curls still can include the column shell, offers on the column shell along the bar groove of radial extension, and the spool is arranged in the column shell, but curly display module assembly stretches out from the bar groove, and the one end that can curl the display module assembly and keep away from the spool is provided with the stop part, and the stop part can't pass through the bar groove to avoid can curling display module assembly to withdraw to the column shell completely. When the curling device is not used, the reel can curl the curling display module on the reel through the rotating device, and only the stop piece is exposed out of the strip-shaped groove; when the crimping device uses, accessible pulling backstop overcomes rotary device's power, makes the spool rotate to the messenger curls and stretches out from the bar groove at the epaxial display module assembly that can curl of spool, thereby extends to a flat display panel, treats to use the completion after, crimping device drives the spool and rotates, withdraws in the display module assembly that can curl to the column shell.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A rollable display device, comprising:

the curlable display module comprises a display area, a peripheral area and a circuit area, wherein the peripheral area is positioned outside the display area, the circuit area is connected with the peripheral area, the peripheral area comprises a frame area connected with the display area and a bending area connected with the circuit area, the circuit area is attached to the side wall of the accommodating cavity through the opening and is fixedly connected with the scroll, the bending area is positioned on the opening, the circuit area and the frame area are positioned on one side of the opening in the circumferential direction of the scroll, and the display area can be curled on the scroll;

wherein, can curl the display module assembly and include:

a support layer at least partially located in the display area;

the flexible display panel is arranged on one side of the back film layer, which is far away from the supporting layer, and at least part of the flexible display panel is positioned in the display area and the peripheral area;

the display function layer is arranged on one side, away from the back film layer, of the flexible display panel and at least partially positioned in the display area;

the chip is arranged on the first circuit layer;

the elastic layer is arranged on one side, away from the back film layer, of the flexible display panel and is located in the peripheral area, and the orthographic projection of the elastic layer on the flexible display panel covers the orthographic projection of the hollowed area on the flexible display panel.

2. A rollable display device according to claim 1, wherein a side wall of the spool at the opening is located in the hollowed-out region.

3. The rollable display device according to claim 1, wherein the peripheral region is fixedly connected to the roll shaft at the opening, and a sidewall of the opening fixedly connected to the rollable display module is a smooth arc surface in a circumferential direction of the roll shaft.