CN111415592A - Back film for laminating flexible display panel, display device and laminating method - Google Patents
Back film for laminating flexible display panel, display device and laminating method Download PDFInfo
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- CN111415592A CN111415592A CN202010357582.4A CN202010357582A CN111415592A CN 111415592 A CN111415592 A CN 111415592A CN 202010357582 A CN202010357582 A CN 202010357582A CN 111415592 A CN111415592 A CN 111415592A
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The invention discloses a back film for laminating a flexible display panel, a display device and a laminating method. The back film comprises: a flexible substrate formed of a material having an elastic modulus of less than 150 MPa; the double-sided adhesive layer is positioned on one side of the flexible substrate; the anti-adhesive layer is positioned on one side of the flexible substrate, which is not provided with the double-sided adhesive layer. Therefore, the back film has enough flexibility and can support the flexible display panel to be attached to the curved cover glass, even the four-side curved cover glass.
Description
Technical Field
The invention relates to the field of display, in particular to a back film for attaching a flexible display panel, a display device and an attaching method.
Background
Although the display panel using a flexible substrate such as O L ED has good flexibility and can meet the requirements of curved display products and even four-sided curved display products (including 4 sidewalls and four R corners), the conventional attaching method has difficulty in attaching the display panel to the inner side of the cover glass in a curved edge intersection region, for example, the R corners have severe wrinkles during attachment.
Therefore, the current back film, display device and attaching method for attaching the flexible display panel still need to be improved.
Disclosure of Invention
The present invention aims to alleviate or solve at least to some extent at least one of the above mentioned problems.
In view of the above, in one aspect of the present invention, a back film for flexible display panel attachment is provided. The back film comprises: a flexible substrate formed of a material having an elastic modulus of less than 150 MPa; the double-sided adhesive layer is positioned on one side of the flexible substrate; the anti-adhesive layer is positioned on one side of the flexible substrate, which is not provided with the double-sided adhesive layer. Therefore, the back film has enough flexibility and can support the flexible display panel to be attached to the curved cover glass, even the four-side curved cover glass.
According to an embodiment of the invention, the material forming the flexible substrate comprises at least one of PO, TPU and PU. The above material has sufficient flexibility, and can prevent defects such as wrinkles generated when the flexible display panel and the cover glass are bonded due to excessive hardness of the back film.
According to an embodiment of the present invention, the material forming the flexible substrate has a strain at break of not less than 70%. Therefore, the attaching effect can be further improved.
According to an embodiment of the present invention, the detackifying adhesive layer is formed of at least one of an ultraviolet photosensitive adhesive and a thermal adhesive, the detackifying adhesive layer having an adhesive force of not less than 2000gf/inch before the detackifying treatment. Therefore, the structure after the flexible display panel is attached to the cover glass can be conveniently taken down from the profiling mold.
According to an embodiment of the present invention, the back film further comprises: the first protective layer is positioned on one side, away from the flexible base material, of the double-sided adhesive layer; the second protective layer is positioned on one side, away from the flexible substrate, of the anti-adhesive layer, and the first protective layer and the second protective layer are formed by PET and release films respectively and independently. Therefore, the service performance of the back film can be further improved.
In another aspect of the present invention, a method of attaching a flexible display panel to a cover glass is provided. The cover glass has a main body surface and a plurality of side walls extending to the same side of the main body surface, and the method comprises the following steps: adhering the back film to the flexible display panel, and adhering the double-sided adhesive layer of the back film to the flexible substrate of the flexible display panel to form a flexible panel prefabricated part; adhering the flexible panel prefabricated part to a profiling fixed part, and enabling the anti-adhesive layer of the back film in the flexible panel prefabricated part to be in contact with the profiling fixed part; stretching the flexible panel preform to make the back film and the flexible display panel have shapes suitable for fitting into the cover glass, and fitting the cover glass to the flexible panel preform; and performing viscosity reduction treatment on the viscosity-reducing adhesive layer so as to take down the flexible panel prefabricated member and the cover glass from the profiling fixing member. Therefore, the flexible display panel and the cover glass can be simply bonded, and defects such as wrinkles at the side wall of the cover glass and even at the R corner can be prevented.
According to an embodiment of the present invention, the profiling fixture has a body profile corresponding to a shape of the cover glass and a sidewall profile, the fixing the flexible panel preform to the body profile of the profiling fixture, and the stretching the flexible panel preform includes: utilize flexible pressure head will flexible panel prefabricated part to lateral wall profile modeling portion one side pushes down, so that flexible display panel with the notacoria is followed lateral wall profile modeling portion is tensile, and through after tensile can subtract the viscose layer and be fixed in on the lateral wall profile modeling portion, form the material of flexible pressure head includes liquid silica gel. Therefore, the flexible display panel prefabricated member can be well attached to the profiling fixing member.
According to the embodiment of the invention, before the flexible panel prefabricated member is adhered to the profiling fixture, the operation of fixing an auxiliary stretching film on the flexible panel prefabricated member is further included, the auxiliary stretching film comprises a hot melt adhesive layer, the hot melt adhesive layer is provided with an adhering area positioned in the middle and stretching areas positioned on two sides of the adhering area, rigid protective films are arranged on the surfaces of two sides of the hot melt adhesive layer at the stretching areas, and one side of the flexible panel prefabricated member is fixed to the adhering area of the hot melt adhesive layer. This can further improve the bonding effect of the method.
According to an embodiment of the present invention, after fixing the auxiliary stretch film on the flexible panel preform, further comprises: fixing the back film side of the flexible panel prefabricated member on the profiling fixing member, wherein the profiling fixing member is provided with a main body profiling surface and a side wall profiling part corresponding to the shape of the cover glass, fixing the flexible panel prefabricated member on the main body profiling surface of the profiling fixing member, stretching the auxiliary stretching film and the flexible panel prefabricated member to one side of the side wall profiling part through the rigid protective film at the stretching region, and fixing the flexible panel prefabricated member and the auxiliary stretching film on the side wall profiling part through the stretched anti-adhesive layer; and heating the hot melt adhesive layer to melt the hot melt adhesive layer, and laminating the flexible panel prefabricated member and the cover plate glass on the basis of hot melting of the hot melt adhesive layer. Therefore, the flexible display panel prefabricated member can be simply attached to the profiling fixing member.
According to an embodiment of the present invention, after the de-bonding treatment of the anti-adhesive layer and the removing of the flexible panel preform and the cover glass from the profiling fixture, further comprises: and carrying out curing treatment on the hot melt adhesive layer and carrying out cutting treatment so as to separate at least the stretching area of the auxiliary stretching film from the cover plate glass. Thereby, the stretched zone of the auxiliary stretched film and the cover glass can be easily separated.
In yet another aspect of the present invention, a display device is provided. The display device includes: the cover glass is provided with a main body surface and 4 side walls extending towards the same side of the main body surface; the flexible display panel is located on the inner surface of the cover plate glass, the inner surface faces one side of the extending direction of the side wall, and the display area of the flexible display panel at least extends to the junction of the two adjacent side walls. The display device is formed by bonding the flexible display panel and the cover glass by the method or the back film. Therefore, the display device has the advantages that four-curved-surface display can be realized, poor display is not easy to occur at the intersection of the side walls of the adjacent curved surfaces and the R angle, and the like.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic structural view of a backsheet according to one embodiment of the present invention;
FIG. 2 shows a schematic structural view of a backsheet according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a bonding method according to an embodiment of the present invention;
FIG. 4 shows a schematic structural diagram of a flexible display panel preform according to an embodiment of the present invention
FIG. 5 shows a schematic structural view of a profiling fixture according to one embodiment of the invention;
FIG. 6 is a schematic partial flow chart illustrating a bonding method according to an embodiment of the present invention;
FIG. 7 shows an enlarged view of a portion of the area in FIG. 6;
FIG. 8 shows a schematic structural view of an auxiliary stretch film according to one embodiment of the present invention;
FIG. 9 shows a schematic structural diagram of an auxiliary stretch film and a flexible display panel preform according to one embodiment of the invention;
fig. 10 is a partial schematic flow chart of a bonding method according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In one aspect of the invention, a backing film for flexible display panel attachment is presented. Referring to fig. 1, the back film includes a flexible substrate 100, a double-sided adhesive layer 200, and a detackifying adhesive layer 300. The elastic modulus of the material forming the flexible substrate 100 is less than 150MPa, the double-sided adhesive layer 200 is located on one side of the flexible substrate 100, and the anti-adhesive layer 300 is located on the side of the flexible substrate 100 where the double-sided adhesive layer 200 is not located. Therefore, the back film has enough flexibility and can support the flexible display panel to be attached to the curved cover glass, even the four-side curved cover glass.
For convenience of understanding, the following first briefly explains the principle by which the above-described advantageous effects can be achieved by the backsheet:
as mentioned before, when the flexible display panel needs to be attached to the glass cover plate with the four curved surfaces, the attachment wrinkles are easily generated at the position where the two curved side walls meet, and then the display at the position is affected. At present, in the related art, the attaching method mainly includes attaching a flexible screen to a back film (carrier film), placing the flexible screen on a profiling fixing member (the shape of which can be as shown in fig. 4) formed of materials such as silica gel and the like for profiling, and then pressing and attaching the flexible screen to cover glass. The attaching method can only correspond to the attaching of the bent cover plates on the two sides, and the attaching of the bent cover plates on the four sides cannot be closely contacted with the profiling fixing piece in the intersection area of the bent sides to achieve full profiling, so that serious wrinkles can be generated during attaching. Once the flexible display panel is wrinkled in the profiling process, the internal circuit of the flexible display panel at the wrinkled part is broken (crack), and the display at the position is poor or even impossible. The inventor has found that this is mainly due to the fact that the attachment of the four-sided curved cover (or when a four-sided display is to be achieved) requires a certain stretchability in the curved edge intersection region. And the conventional back film material basically has no stretchability, so the conventional back film can seriously restrict the stretchability of the flexible display panel, and the failure of the attaching precision, attaching crack and bubbles occur in the attaching process.
According to the embodiment of the invention, the flexible substrate in the back film has a lower elastic modulus, so that the flexibility is better, and the flexible substrate can be stretched along with the flexible display panel in the attaching process, so that the generation of wrinkles and bubbles can be relieved. According to some embodiments of the invention, 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, specifically, the material forming the flexible substrate includes at least one of PO (propylene oxide), TPU (thermoplastic polyurethane elastomer rubber), and PU (polyurethane). The above material has sufficient flexibility, and can prevent defects such as wrinkles generated when the flexible display panel and the cover glass are bonded due to excessive hardness of the back film.
According to the embodiment of the invention, the back film can be used for adhering the flexible display panel and the back plate through one side of the double-sided adhesive layer 200. The detackable adhesive layer 300 may lose its tackiness after the detackification process, and thus may be used to attach a backing film with a flexible panel attached thereto to a profiling fixture, and the detackable adhesive layer 300 may be subjected to the detackification process after the attachment of the cover glass and the flexible display panel is achieved, thereby separating the above-described structure from the profiling fixture. Specifically, the detackifying adhesive layer 300 may be formed of at least one of an ultraviolet photosensitive adhesive and a thermal adhesive, the detackifying adhesive layer 300 having an adhesive force of not less than 2000gf/inch before the detackifying process. Therefore, the structure after the flexible display panel is attached to the cover glass can be conveniently taken down from the profiling mold.
According to the embodiment of the present invention, since both sides of the flexible substrate of the back film are adhesive layers having adhesiveness, in order to facilitate transportation and handling of the back film during the lamination process, referring to fig. 2, the back film further includes a first protective layer 400 and a second protective layer 500. Specifically, the first protection layer 400 is located on the side of the double-sided adhesive layer 200 away from the flexible substrate 100, and the second protection layer can be located on the side of the anti-adhesive layer 300 away from the flexible substrate 100. The first protective layer and the second protective layer may be formed of PET or a release film, respectively and independently. Thereby, the adhesive surfaces of the double-sided adhesive layer 200 and the detackifying adhesive layer 300 can be protected from being contaminated by dust in the environment during transportation or the like to lose the adhesiveness.
In another aspect of the present invention, a method of attaching a flexible display panel to a cover glass is provided. The method adopts the back film, so that the defects of wrinkles, bubbles and the like caused by poor tensile property of the back film when the flexible display panel is adhered to the cover glass can be prevented. As described above, since the above-described back film has good flexibility, the cover glass of the multi-curved-surface side wall can be attached to the back film. That is, the cover glass in the method may have a main body surface and a plurality of side walls extending to the same side of the main body surface.
The individual steps of the method are described in detail below according to specific embodiments of the invention. Referring to fig. 3, the method may include the steps of:
s100: adhering the back film to the flexible display panel to form a flexible panel preform
According to an embodiment of the present invention, in this step, the above-mentioned back film and the flexible display panel are firstly bonded, and the double-sided adhesive layer of the back film is bonded to the flexible substrate of the flexible display panel to form the flexible panel preform. Referring to fig. 4 in particular, the flexible display panel 700 may be fixed on the double-sided adhesive layer 200, whereby a flexible panel preform 1000 including a back film and the flexible display panel 700 may be formed.
S200: adhering the prefabricated flexible panel onto the copying fixture
According to an embodiment of the invention, the flexible panel preform is attached to the profiling fixture in this step, with the layer of detackable glue of the backing film in the flexible panel preform being in contact with the profiling fixture. Referring specifically to fig. 5, the contoured mount may be a member formed of a material such as silicone, having a mounting function and a contoured surface. Specifically, the upper surface of the profiling fixture may have a profiling surface matching the shape of the inner side of the cover glass (the side to which the flexible display panel is to be attached). In particular, the profile surface may have one main body profile surface and 4 side wall profile portions extending to the same side (lower side). In this step, the prefabricated body of the sex panel can be stuck on the main body copying surface of the copying surface and fixed. Because the side wall profiling part extends downwards from the edge of the main body profiling surface, a certain gap is formed between the edge of the flexible panel prefabricated part fixed on the main body profiling surface and the main body profiling surface before the edge of the flexible panel prefabricated part is stretched, so that the flexible panel prefabricated part can be stretched.
S300: stretching the flexible panel preform and attaching it to the cover glass
According to an embodiment of the invention, the flexible panel preform is stretched in this step to give the backsheet and the flexible display panel a shape suitable for fitting into the cover glass, and the cover glass is fitted to the flexible panel preform.
Specifically, stretching the flexible panel preform may be accomplished using a flexible ram. For example, the flexible indenter may be made of liquid silicone (printing silicone), and referring to fig. 6 and 7, the flexible panel preform 1000 is pressed down to the side of the sidewall contour portion by the flexible indenter 20 in this step, so that the flexible display panel and the back film are stretched along the sidewall contour portion and fixed to the sidewall contour portion by the stretched anti-adhesive layer. The flexible pressure head made of the printing silica gel has excellent flexibility and certain gravity, in the process that the flexible pressure head 20 is pressed down, the flexible pressure head 20 can deform according to the shape of the profiling fixing piece 2000, the flexible panel prefabricated piece 1000 is pressed down to be attached to the profiling fixing piece 2000, the four corner regions of the flexible panel prefabricated piece 1000 with the stretching capability in the attaching process are transversely stretched and deformed under the action of the pulling force of two adjacent straight edges (shown as F1 in the figure), and meanwhile, as the liquid silica gel has certain gravity and certain friction coefficient on the surface, the four corner regions of the flexible panel prefabricated piece 1000 with the stretching capability can be driven to stretch and deform along the tangential direction of the arc edges of the profiling fixing piece 2000 (shown as F2 in the figure). Thereby, the flexible panel preform 1000 can be closely attached to the profiling fixture 2000. The cover glass may then be attached to the contoured flexible panel preform 1000, for example, by adhesively securing the flexible panel preform 1000 to the cover glass using an optical glue layer applied to the inside of the cover glass.
Alternatively, according to further embodiments of the present invention, this step may also be achieved by means of an auxiliary stretch film. In particular, the auxiliary stretch film may be secured to the flexible panel preform prior to affixing the flexible panel preform to the profile fixture. Referring to fig. 8 and 9, the auxiliary stretch film 600 may include a hot melt adhesive layer 610, the hot melt adhesive layer 610 has a bonding area 600C located in the middle and stretch areas (600A and 600B as illustrated in the figure) located at both sides of the bonding area, and the surfaces of both sides of the hot melt adhesive layer 610 at the stretch areas have rigid protective films, 620 and 630 as illustrated in the figure. The rigid protective film may be a film layer covering the entire surface of the hot melt adhesive layer 610, thereby protecting the attachment area of the hot melt adhesive layer between attaching the flexible panel preform 1000. The material of the hot melt adhesive layer 610 has the functions of heating, melting, flowing and UV curing, is in a solid film shape before heating, has the elongation rate of more than 100 percent, has better stretchability, has only physical adhesive force on the surface, and can better assist the flexible panel prefabricated member 1000 in stretching deformation. The optical adhesive has chemical adhesive force after being heated and has flowability, so that bubbles can be filled, and the chemical adhesive force can be kept to firmly adhere to the cover glass after being cured by UV, so that the optical adhesive can also replace an optical adhesive layer on the inner side of the cover glass.
Before the flexible panel preform 1000 and the auxiliary stretch film 600 are bonded, the rigid protective films on the two sides of the bonding area may be sequentially torn off, and then the flexible panel preform 1000 is bonded to the bonding area of the hot melt adhesive layer, and the double-sided adhesive layer in the flexible panel preform 1000 is brought into contact with the hot melt adhesive layer, so as to obtain the structure shown in fig. 9. In order to facilitate operation, the peeling force between the two rigid protective films and the hot melt adhesive layer can be different, and the rigid protective films with smaller peeling force can be removed firstly when the rigid protective films on the two sides of the pasting area are removed. At this time, the flexible panel preform 1000 and the stretching region (hot melt adhesive layer) of the auxiliary stretching film have good flexibility, and can be fully stretched in the subsequent attaching process. The rigid protective film is located in the stretching area, so that on one hand, stretching deformation of the flexible panel prefabricated member 1000 is not affected, and on the other hand, the rigid protective film which is not sticky and has certain hardness can be used as a stress point of stretching operation, so that a jig or a mechanical arm and other structures can conveniently tie up the residual rigid protective film at the stretching area for operation. To facilitate deformation and profiling of the hot melt adhesive layer, the flexible panel preform 1000 may be spaced apart from the rigid protective film remaining in the stretch zone by a distance, for example, the single edge spacing may be 15mm greater.
Referring to fig. 10, the operation of securing and stretching the flexible panel preform 1000 on the profile-securing portion 2000 may then be performed. At the moment, the hot melt adhesive layer only has physical adhesive force and can drive the attached flexible screen to deform correspondingly. The tensile district part that supplementary tensile membrane was got to usable tool clamp is the pulling downwards, and the flexible panel prefab of hot melt adhesive layer below is closely attached with the profile modeling mounting under hot melt adhesive layer's overdraft, realizes the profile modeling. Because the hot melt adhesive layer is soft and easy to stretch, the flexible screen can be driven to fully stretch and deform in the stretching process, so that the flexible screen can be more easily and tightly attached to the profiling fixing piece at the four corners, and the stress and the deformation are more sufficient. After the profiling is completed, a heat medium may be introduced into the heating passage 4100 of the cover plate jig 4000 for holding the cover plate glass 3000, and the hot melt adhesive layer may be hot-melted by the cover plate glass 3000 heated by the heat medium. For example, hot air at 50-65 deg.C can be introduced. In the laminating process, the hot melt adhesive layer starts to melt and flow under the heat action of the heated cover plate glass and has chemical adhesive force, and the hot melt adhesive layer flows and fills bubbles formed in the laminating process under the action of laminating pressure, so that the laminating and the bubble exhausting are carried out simultaneously. The hot melt adhesive layer can prevent the flexible panel prefabricated member 1000 from shrinking and deforming at four corners during bonding by heating and flowing, and can effectively prevent the formation of bonding wrinkles.
S400: performing viscosity reduction treatment on the viscosity-reducing adhesive layer to take down the flexible panel prefabricated member and the cover plate glass from the profiling fixing member
According to an embodiment of the invention, the detackifying means is provided in the step. The viscosity of the anti-adhesive layer is reduced after anti-adhesive treatment, so that the anti-adhesive layer can be taken down from the profiling fixing piece, and the attachment of the cover plate glass and the flexible panel is completed. The specific parameters of the detackifying treatment are not particularly limited and can be determined by one skilled in the art based on the specific chemical composition of the detackifying glue layer. For example, the anti-adhesive layer may be formed of an ultraviolet photosensitive adhesive, and the anti-adhesive treatment may be to irradiate the anti-adhesive layer with ultraviolet light through the transparent copying fixing portion (silica gel) to make the ultraviolet photosensitive adhesive on the back film lose adhesiveness, thereby achieving separation from the copying fixing portion.
According to some examples of the invention, in profiling and fixing with the auxiliary stretch film, after the mechanical energy debinding of the detackable adhesive layer and its removal from the profiling fixture, the operations of curing the hot melt adhesive layer of the auxiliary stretch film and cutting the stretch zone may be further included: can be used at UV wavelength of 365-410 nm and energy of more than or equal to 2500mJ/cm2The hot melt adhesive layer is solidified in the environment, and the stretching area material for copying grabbing is removed by using methods such as laser cutting and the like.
In yet another aspect of the present invention, a display device is provided. The display device includes: the cover glass is provided with a main body surface and 4 side walls extending towards the same side of the main body surface; the flexible display panel is located on the inner surface of the cover plate glass, the inner surface faces one side of the extending direction of the side wall, and the display area of the flexible display panel at least extends to the junction of the two adjacent side walls. The display device is formed by bonding the flexible display panel and the cover glass by the method or the back film. Therefore, the display device has the advantages that four-curved-surface display can be realized, poor display is not easy to occur at the intersection of the side walls of the adjacent curved surfaces and the R angle, and the like.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A backsheet for flexible display panel applications, comprising:
a flexible substrate formed of a material having an elastic modulus of less than 150 MPa;
the double-sided adhesive layer is positioned on one side of the flexible substrate;
the anti-adhesive layer is positioned on one side of the flexible substrate, which is not provided with the double-sided adhesive layer.
2. The backsheet of claim 1, wherein the material forming the flexible substrate comprises at least one of PO, TPU, and PU;
optionally, the material forming the flexible substrate has a strain at break of not less than 70%.
3. The backsheet according to claim 1, wherein the detackifying adhesive layer is formed of at least one of an ultraviolet photosensitive adhesive and a thermal adhesive, the detackifying adhesive layer having an adhesive force of not less than 2000gf/inch before the detackifying treatment.
4. The backsheet of claim 1, further comprising:
the first protective layer is positioned on one side, away from the flexible base material, of the double-sided adhesive layer;
a second protective layer positioned on one side of the anti-adhesive layer far away from the flexible base material,
the first protective layer and the second protective layer are respectively and independently formed of PET and a release film.
5. A method of attaching a flexible display panel to a cover glass, the cover glass having a body surface and a plurality of side walls extending toward a same side of the body surface, the method comprising:
adhering the back film of any one of claims 1-4 to the flexible display panel and adhering the double-sided adhesive layer of the back film to the flexible substrate of the flexible display panel to form a flexible panel preform;
adhering the flexible panel prefabricated part to a profiling fixed part, and enabling the anti-adhesive layer of the back film in the flexible panel prefabricated part to be in contact with the profiling fixed part;
stretching the flexible panel preform to make the back film and the flexible display panel have shapes suitable for fitting into the cover glass, and fitting the cover glass to the flexible panel preform;
and performing viscosity reduction treatment on the viscosity-reducing adhesive layer so as to take down the flexible panel prefabricated member and the cover glass from the profiling fixing member.
6. The method of claim 5, wherein the profiling fixture has a body profile corresponding to the shape of the cover glass and a sidewall profile, securing the flexible panel preform to the body profile of the profiling fixture, stretching the flexible panel preform comprising:
pressing the flexible panel prefabricated member downwards to one side of the side wall profiling part by using a flexible pressure head so as to stretch the flexible display panel and the back film along the side wall profiling part and fix the flexible display panel and the back film on the side wall profiling part through the stretched anti-adhesive layer,
the material forming the flexible indenter comprises liquid silicone.
7. The method according to claim 5, characterized in that before adhering the flexible panel preform to the profiling fixture, the method further comprises the operation of fixing an auxiliary stretching film on the flexible panel preform, wherein the auxiliary stretching film comprises a hot melt adhesive layer, the hot melt adhesive layer is provided with a sticking area in the middle and stretching areas on two sides of the sticking area, the surfaces on two sides of the hot melt adhesive layer at the stretching areas are provided with rigid protective films, and one side of the flexible panel preform is fixed on the sticking area of the hot melt adhesive layer.
8. The method of claim 7, further comprising, after securing the auxiliary stretch film to the flexible panel preform:
fixing the back film side of the flexible panel prefabricated member on the profiling fixing member, wherein the profiling fixing member is provided with a main body profiling surface and a side wall profiling part corresponding to the shape of the cover glass, fixing the flexible panel prefabricated member on the main body profiling surface of the profiling fixing member, stretching the auxiliary stretching film and the flexible panel prefabricated member to one side of the side wall profiling part through the rigid protective film at the stretching region, and fixing the flexible panel prefabricated member and the auxiliary stretching film on the side wall profiling part through the stretched anti-adhesive layer;
and heating the hot melt adhesive layer to melt the hot melt adhesive layer, and laminating the flexible panel prefabricated member and the cover plate glass on the basis of hot melting of the hot melt adhesive layer.
9. The method of claim 8, further comprising, after de-tacking the layer of de-tacking adhesive and removing the flexible panel preform and the cover glass from the profiling fixture:
and carrying out curing treatment on the hot melt adhesive layer and carrying out cutting treatment so as to separate at least the stretching area of the auxiliary stretching film from the cover plate glass.
10. A display device, comprising:
the cover glass is provided with a main body surface and 4 side walls extending towards the same side of the main body surface;
a flexible display panel located on an inner surface of the cover glass, the inner surface being a surface facing one side of an extending direction of the sidewall,
the display area of the flexible display panel at least extends to the junction of the two adjacent side walls.
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| CN202010357582.4A CN111415592B (en) | 2020-04-29 | 2020-04-29 | Method for attaching flexible display panel and cover glass and display device |
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| CN202010357582.4A CN111415592B (en) | 2020-04-29 | 2020-04-29 | Method for attaching flexible display panel and cover glass and display device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111883474A (en) * | 2020-07-31 | 2020-11-03 | 霸州市云谷电子科技有限公司 | Display device and preparation method of flexible display panel |
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| CN112053633A (en) * | 2020-09-16 | 2020-12-08 | 京东方科技集团股份有限公司 | Display device |
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| CN112652242A (en) * | 2020-12-09 | 2021-04-13 | 深圳一鑫新材料有限公司 | Flexible curved surface display screen laminating process |
| CN113053245A (en) * | 2021-03-11 | 2021-06-29 | 京东方科技集团股份有限公司 | Profiling device, laminating method and display device |
| US12076891B2 (en) | 2021-03-11 | 2024-09-03 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Profiling device, profiling method, bonding system, bonding method, and display device |
| CN113362722B (en) * | 2021-06-24 | 2023-05-30 | 云谷（固安）科技有限公司 | Cover plate, display panel and preparation method of display panel |
| CN113362722A (en) * | 2021-06-24 | 2021-09-07 | 云谷（固安）科技有限公司 | Cover plate, display panel and preparation method of display panel |
| CN114078396A (en) * | 2021-11-30 | 2022-02-22 | 云谷（固安）科技有限公司 | Bonding method and bonding apparatus |
| US11903240B2 (en) | 2021-11-30 | 2024-02-13 | Wuhan Tianma Microelectronics Co., Ltd. | Display device and preparation method thereof |
| CN114170906A (en) * | 2021-12-13 | 2022-03-11 | 合肥维信诺科技有限公司 | Method for manufacturing curved surface display device |
| CN114170906B (en) * | 2021-12-13 | 2024-04-26 | 合肥维信诺科技有限公司 | Method for manufacturing curved display device |
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