CN111768715A

CN111768715A - Flexible display module and display device

Info

Publication number: CN111768715A
Application number: CN202010766221.5A
Authority: CN
Inventors: 张家豪; 刘君欢; 王浩然; 时永祥; 朱红
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2020-10-13
Anticipated expiration: 2040-08-03
Also published as: CN111768715B

Abstract

The utility model relates to a flexible display module assembly and display device, this flexible display module assembly includes: the flexible display device comprises a support, a flexible display substrate and a flexible cover plate, wherein the support comprises a first support part and a second support part surrounding the first support part; in the thickness direction of the support, the thickness of the second support part is greater than that of the first support part, and the modulus of the first support part is greater than that of the second support part; the flexible display substrate is arranged on one side of the first supporting part, and the second supporting part surrounds the flexible display substrate; the flexible cover plate is arranged on one side, deviating from the first supporting part, of the flexible display substrate and is connected with the second supporting part. The flexible display module that this disclosure provided provides flexible display module's curling performance.

Description

Flexible display module and display device

Technical Field

The utility model relates to a show technical field, particularly, relate to a flexible display module assembly and display device.

Background

With the development of oled (organic Light Emission diode) display technology in recent years, products and research related to flexible display panels, such as curved panels and foldable panels, have drawn more and more attention. Display devices such as mobile phones, tablet computers, televisions and the like are indispensable to daily life of people, and particularly, mobile phones are taken as portable electronic equipment and have integrated functions of surfing the internet, chatting, shopping, playing videos and the like.

However, the display screen of the current mobile phone displays a narrow playing picture when playing a video, and is difficult to provide good visual experience for people; if the size of the display screen of the mobile phone is increased, the mobile phone is difficult to hold and inconvenient to carry.

OLED display screens have gained popularity in the current market due to their unique ability to bend, fold and flex without breakage and to maintain their ability to display images normally after bending, folding and flexing. Furthermore, even where the screens are preferably flat when in use, these display screens may still be folded or rolled for storage. However, the curling performance of the display module in the current OLED display device is poor, so that the product failure rate is high.

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

The utility model aims to provide a flexible display module assembly and display device can improve curling performance.

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

a support including a first support and a second support surrounding the first support; in the thickness direction of the support, the thickness of the second support part is greater than that of the first support part, and the modulus of the first support part is greater than that of the second support part;

the flexible display substrate is arranged on one side of the first supporting part, and the second supporting part surrounds the flexible display substrate;

and the flexible cover plate is arranged on one side of the flexible display substrate, which deviates from the first supporting part, and is connected with the second supporting part.

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

the back film is arranged on one side, deviating from the flexible cover plate, of the flexible display substrate.

and the frame glue is arranged between the second supporting part and the flexible cover plate.

In an exemplary embodiment of the present disclosure, a gap is provided between the first supporting portion and the second supporting portion, and a void ratio of the first supporting portion is greater than a void ratio of the second supporting portion.

In an exemplary embodiment of the present disclosure, the first support part and the second support part are of an integral structure.

In an exemplary embodiment of the present disclosure, the first supporting portion and the second supporting portion are a split structure.

In an exemplary embodiment of the present disclosure, a difference in thickness between the first support and the second support is 150 μm to 250 μm.

In an exemplary embodiment of the present disclosure, the first support part and the second support part are made of the same material.

In an exemplary embodiment of the present disclosure, the support is formed of a stainless steel material.

According to another aspect of the present disclosure, a display device is also provided, which includes the above flexible display module.

According to the flexible display module, the support comprises the first support part and the second support part surrounding the first support part according to the requirements of different support properties of different areas when the flexible display module is curled, the thickness of the second support part is larger than that of the first support part, the modulus of the first support part is larger than that of the second support part, the modulus of the first support part is relatively reduced, the first support part is relatively soft, and the curling capability is improved; the modulus of the second supporting part is relatively improved, so that the second supporting part is relatively hard, and the supporting property and the tensile capacity are improved; the whole warping of the flexible display module caused by the warping of the edge of the monomer material is improved, the warping can influence the touch performance of the edge, and meanwhile, the flexible display module is subjected to certain prestress, so that the stress in the curling is not matched, and the reliability is invalid; the problem that the outer roll is not fixed on the scroll by a proper fixing layer is solved, the fixing film layer of the outer roll can be transferred to the supporting piece through the flexible cover plate, so that the flexible display module can bear larger pulling force, and edge layering caused by the fact that the fixing film layer is not proper is prevented from being generated in the flexible display module; the thickness thickening and the modulus are adopted at the curling starting fixed end, the tensile capacity is improved, the patterned metal at the starting fixed end is prevented from being broken, and therefore the purpose of improving the curling performance of the flexible display module 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 is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

FIG. 1 is a top view of a support provided by one embodiment of the present disclosure;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 according to one embodiment of the present disclosure;

FIG. 3 is a schematic view of a flexible display module according to an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view taken along the line A-A of FIG. 1 according to another embodiment of the present disclosure;

fig. 5 is a schematic view of a flexible display module according to another embodiment of the present disclosure.

Description of reference numerals:

10. the display device comprises a support part, 110, a first support part, 120, a second support part, 20, a back film, 30, a flexible display substrate, 40, frame glue, 50, a flexible cover plate, 60 and a scroll.

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. However, it will be appreciated by one skilled in the art that aspects of the disclosure may be practiced without one or more of the specific details. 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 other than the listed elements; the terms "first," "second," and the like are used merely as labels, and are not limiting on the number of their objects.

The applicant has developed many problems to be solved during the actual development of the rolled product, two problems being found as follows:

firstly, warping: since the surface of the flexible Cover plate (Cover Film) is coated with a hardened layer (HC), during the preparation process, HC materials are dissolved in a solution, coated on the surface of transparent polyimide (CPI), and then baked and other processes are performed to remove the solution on the surface, and the stress on the surface can change during the solution removal process, which causes the material to warp. After the whole module is attached, the Cover Film monomer can cause the corresponding position of the whole display module to warp due to the thinner thickness of the curling module, and at the moment, the display module is in an uneven state, which is equivalent to the fact that the module is stressed in advance, and the reliability of outward rolling (the display surface faces outwards) can be influenced.

Secondly, the improper selection of the external-rolling fixing mode causes the membrane layer separation (peeling): the fixing method during the curling is that the display module needs to be fixed on the scroll during the curling, and different fixing methods have a great influence on the reliability of the curling. The fixing mode of the inner rolling module adopts a mode of fixing a supporting piece on the back of the module. The main aim of the current stage is to solve the fixing mode of the outward rolling module. There are two fixing modes of fixing support and Cover Film.

The problem with the fixed support is that the flexible display substrate (Panel) is easily peeled off from the package during the curling process, affected by the bounce force and the cut edge of the module. The module is invalid, so the mode of fixing the supporting piece is not adopted in the current stage of the outward rolling module.

In addition, the reel is fixed with the edge of the Cover film by using double faced adhesive tape, and the fixing mode of the Cover film is the scheme adopted at present. Its benefit is the problem point that can not take place the edge encapsulation and peel off, but Cover Film's material is organic macromolecular material, and if long-time atress was dragged, plastic deformation can take place, produces the deformation that can't reply, causes the influence to the reliance of module.

In this example embodiment, there is first provided a flexible display module, as shown in fig. 1 to 5, including: the display device comprises a support 10, a flexible display substrate 30 and a flexible cover plate 50, wherein the support 10 comprises a first support part 110 and a second support part 120 surrounding the first support part 110; in the thickness direction of the support 10, the thickness of the second support 120 is greater than the thickness of the first support 110, and the modulus of the first support 110 is greater than the modulus of the second support 120; the flexible display substrate 30 is disposed at one side of the first supporting portion 110, and the second supporting portion 120 surrounds the flexible display substrate 30; the flexible cover plate 50 is disposed on a side of the flexible display substrate 30 away from the first supporting portion 110, and is connected to the second supporting portion 120.

According to the flexible display module provided by the disclosure, aiming at the requirements of different support properties of different areas when the flexible display module is curled, the support 10 comprises the first support part 110 and the second support part 120 surrounding the first support part 110, the thickness of the second support part 120 is larger than that of the first support part 110, the modulus of the first support part 110 is larger than that of the second support part 120, the modulus of the first support part 110 is relatively reduced, the first support part 110 is relatively softer, and the curling capability is improved; the modulus of the second supporting part 120 is relatively improved, so that the second supporting part 120 is relatively harder, and the support and tensile capacity are improved; the whole warping of the flexible display module caused by the warping of the edge of the monomer material is improved, the warping can influence the touch performance of the edge, and meanwhile, the flexible display module is subjected to certain prestress, so that the stress in the curling is not matched, and the reliability is invalid; the problem that the outer roll is not fixed on the scroll 60 by a proper fixing layer is solved, the fixing film layer of the outer roll can be transferred to the support 10 through the flexible cover plate 50, so that the flexible display module can bear larger pulling force, and edge delamination caused by the fact that the fixing film layer is improper is prevented from being generated in the flexible display module; the thickness thickening and the modulus are adopted at the curling starting fixed end, the tensile capacity is improved, the patterned metal at the starting fixed end is prevented from being broken, and therefore the purpose of improving the curling performance of the flexible display module is achieved.

As shown in fig. 3 and 5, the flexible display module further includes: a Back Film (BF)20, the back film 20 being disposed on a side of the flexible display substrate (panel)30 facing away from the flexible cover (cover film) 50. By disposing the back film 20 on the back side of the flexible display substrate 30, the back film 20 can provide a supporting force to the flexible display substrate 30 to achieve a better bending effect.

The backing film 20 may include a flexible substrate, a double-sided adhesive layer, and a detackable adhesive layer. The elastic modulus of the material forming the flexible base material is less than 150MPa, the double-sided adhesive layer is positioned on one side of the flexible base material, and the anti-adhesive layer is positioned on the side, not provided with the double-sided adhesive layer, of the flexible base material. Thus, the backing film 20 is flexible enough to support the attachment of the flexible display substrate 30 to a curved cover glass, even a quadrilateral cover glass. The flexible substrate of the backsheet 20 has a low elastic modulus, so that it is flexible and can stretch along with the flexible display panel during the attaching process, thereby alleviating the generation of wrinkles and air bubbles. Wherein the material forming the flexible substrate may have a strain at break of not less than 70%. Therefore, the attaching effect can be further improved. For example, the material forming the flexible substrate includes at least one of PO (propylene oxide), TPU (thermoplastic polyurethane elastomer rubber), and PU (polyurethane). The material has sufficient flexibility, and can prevent defects such as wrinkles generated when the flexible display substrate 30 and the flexible cover sheet 50 are bonded due to excessive hardness of the back film 20.

As shown in fig. 3 and 5, the flexible display module further includes: the sealant 40 is disposed between the second supporting portion 120 and the flexible cover plate 50, and the sealant 40 is disposed between the second supporting portion 120 and the flexible cover plate 50. The second supporting portion 120 of the supporting member 10 is connected to the flexible cover plate 50 through the sealant 40, and the sealant 40 is mainly used for bonding the second supporting portion 120 and the flexible cover plate 50, and the material thereof may be, for example, foam adhesive, acrylate, epoxy resin, etc. The connection reliability between the second supporting portion 120 and the flexible cover plate 50 can be increased by the sealant 40, so that the curling performance of the flexible display module is improved. In addition, the second supporting portion 120 and the flexible cover plate 50 may be further bonded together by OCA optical cement, which is not limited by the present disclosure.

Wherein, in the thickness direction of the support 10 (i.e. the thickness direction of the flexible display module), the thickness of the sealant 40 is 50 μm to 100 μm, such as 50 μm, 60 μm, 80 μm, 100 μm, etc., which is not listed herein; of course, the thickness of the sealant 40 may also be less than 50 μm or greater than 100 μm, which is not limited in this disclosure.

Specifically, a gap is formed between the first supporting portion 110 and the second supporting portion 120, and the void ratio of the first supporting portion 110 is greater than the void ratio of the second supporting portion 120. The modulus of the first support part 110 is made larger than the modulus of the second support part 120 by making the porosity of the first support part 110 larger than the porosity of the second support part 120.

As shown in fig. 1, the supporter 10 is patterned (pattern), the supporter 10 is divided into a first supporter 110 and a second supporter 120 by the pattern, and the first supporter 110 and the second supporter 120 have different pattern configurations. The area of the first supporting part 110 corresponds to the curling part of the flexible display module and is also a display part, the grid space of the pattern is wider, and the modulus of the whole part is softer, so that the curling of the flexible display module is facilitated; the area of the second supporting portion 120 corresponds to the fixed portion and the edge of the flexible display module, the grid space of the pattern is thin, and the whole body is hard, so that the flexible display module has better supporting effect and tensile strength. In fig. 1, the filled portion is a solid portion, and the unfilled portion is a grid gap portion formed by patterning.

In addition, the shape of the pattern is not limited in the present disclosure, for example, the shape of the gap is a parallelogram, an ellipse, etc., and all the patterns are divided into a dense part and a dense part, the overall modulus of the first supporting part 110 is low and is soft, and the overall modulus of the second supporting part 120 is high and is hard, so that the same technical effect can be achieved, and all the patterns belong to the protection scope of the present disclosure.

As shown in fig. 2 and 3, the first support part 110 and the second support part 120 are of an integral structure. Through making first supporting part 110 and second supporting part 120 structure as an organic whole, can promote the overall structure intensity of support piece 10 to promote first supporting part 110 and second supporting part 120 tensile strength, prevent that the patterning metal of originated stiff end from being broken, thereby realized promoting the purpose that flexible display module curled the performance.

As shown in fig. 4 and 5, the first support portion 110 and the second support portion 120 are separated from each other. Through making for the components of a whole that can function independently structure between first supporting part 110 and the second supporting part 120, can promote the ability of can curling of first supporting part 110 and second supporting part 120, avoid appearing leading to the stress in curling not matching for the problem that the dependability became invalid, thereby realized promoting the purpose that flexible display module curled the performance.

Wherein, the first supporting part 110 and the second supporting part 120 are made of the same material. For example, the support 10 is made of 304 stainless steel material. Of course, the materials of the first supporting portion 110 and the second supporting portion 120 may also be different, and the disclosure does not limit this.

The thickness of the first supporting portion 110 may be 50 μm to 150 μm, such as 50 μm, 70 μm, 90 μm, 100 μm, 120 μm, 130 μm, 150 μm, etc., which are not listed herein; of course, the thickness of the first support part 110 may be less than 50 μm or greater than 150 μm, which is not limited by the present disclosure. The thickness of the second supporting portion 120 may be 250 μm to 350 μm, such as 250 μm, 270 μm, 290 μm, 300 μm, 320 μm, 330 μm, 350 μm, etc., which are not enumerated herein; of course, the thickness of the second support part 120 may be less than 250 μm or greater than 350 μm, which is not limited by the present disclosure.

Wherein, the thickness difference between the first supporting portion 110 and the second supporting portion 120 is 150 μm to 250 μm, such as 150 μm, 170 μm, 190 μm, 200 μm, 220 μm, 230 μm, 250 μm, etc., which is not enumerated herein; of course, the thickness of the first supporting portion 110 and the second supporting portion 120 may be less than 150 μm or greater than 250 μm, which is not limited by the present disclosure.

Through having carried out design constraint to the thickness of first supporting part 110 and second supporting part 120, the thickness of first supporting part 110 is lower, and the thickness of second supporting part 120 is higher, and the difference of the thickness of first supporting part 110 and second supporting part 120 is the thickness of whole module of curling, is about 200 um. Through the design, on one hand, the strength of the fixed end and the edge of the supporting piece 10 can be improved, so that the fixed end can bear larger pulling force, and the supporting piece 10 can be conveniently patterned in a subsequent fixed area; on the other hand, the thickness of the fixed end of the supporting member 10 is increased, the supporting member 10 and the flexible cover plate 50 can be conveniently attached together through the frame glue 40, the supporting member 10 is driven to roll the flexible cover plate 50, the fixed film layer is transferred to the supporting member 10 through the flexible cover plate 50 in a mode of fixing the supporting member 10, and meanwhile, the supporting member 10 is prevented from being independently fixed, so that the module is rebounded and cut in the curling process, the edge is affected, and the flexible display substrate 30 is easily stripped from the packaging position to cause the display module to fail.

The present disclosure also provides a display device, which includes the above flexible display module. The display device can be a mobile phone, an electronic reader, a flat-panel telegraph and the like, which are not listed in the disclosure. The beneficial effects of the display device provided by the present disclosure refer to the above discussion about the beneficial effects of the flexible display module, and are not described in detail herein.

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. The utility model provides a flexible display module assembly which characterized in that includes:

2. The flexible display module of claim 1, further comprising:

3. The flexible display module of claim 1, further comprising:

4. The flexible display module of claim 1, wherein a gap is provided between the first support and the second support, and the void fraction of the first support is greater than the void fraction of the second support.

5. The flexible display module of claim 1, wherein the first support portion and the second support portion are a unitary structure.

6. The flexible display module of claim 1, wherein the first support portion and the second support portion are separated from each other.

7. The flexible display module of claim 1, wherein the difference in thickness between the first support and the second support is 150 μ ι η -250 μ ι η.

8. The flexible display module of claim 1, wherein the first support and the second support are made of the same material.

9. The flexible display module of claim 1, wherein the support is formed from a stainless steel material.

10. A display device comprising the flexible display module according to any one of claims 1 to 9.