CN116209307A - Display module, display device and manufacturing method of display module - Google Patents

Abstract

The application relates to a display module, a display device and a manufacturing method of the display module. The display module includes: a display panel and a protective film layer. The display panel comprises a first plane area, a bending area and a second plane area, wherein the bending area is connected with the first plane area and the second plane area. The protective film layer is arranged at least covering the bending area on the display side of the display panel. The protective film layer comprises a first protective layer and a protective layer, the first protective layer is positioned between the protective layer and the display panel, the thickness of the protective film layer is H, and H is more than or equal to 10 mu m and less than or equal to 50 mu m. According to the embodiment of the application, the thickness of the protective film layer is reduced on the premise that the bending stress of the bending area is ensured, so that the area of the bending area of the display module occupying the non-display area is reduced, the narrow frame design of the display module is realized, and the experience of a user is improved.

Description

Display module, display device and manufacturing method of display module

Technical Field

The application relates to the technical field of display, in particular to a display module, a display device and a manufacturing method of the display module.

Background

With the development of OLED (Organic Light-Emitting Diode) technology, the middle-high-end market of the display device is currently occupied because of the advantages of being able to realize bending and folding, narrow frame, and the like. In order to further increase the screen ratio of the display device, the OLED flexible display device generally uses a substrate of a display panel as a flexible substrate, and in the process of the display device, a driving chip is bound to a bendable side of the flexible substrate, and then the flexible substrate is bent, so that the driving chip is disposed on the backlight side of the display panel.

Bending stress of a bending area is reduced and corrosion of external water vapor to a substrate is avoided by covering a bending protection layer (Bending Protection Layer, BPL) sealing glue on the bending area of the flexible substrate, however, the characteristic factor of the BPL sealing glue makes it difficult to further reduce the width of a frame of the display device and reduce the difficulty of a manufacturing process.

Disclosure of Invention

According to the display module, the display device and the manufacturing method of the display module, the frame size of the display module can be effectively reduced, and the narrow frame effect of the display module is improved.

In a first aspect, according to an embodiment of the present application, a display module is provided, including: the display panel comprises a first plane area, a bending area and a second plane area, wherein the bending area is connected with the first plane area and the second plane area; the display panel comprises a display panel, a protective film layer and a protective film layer, wherein the display side of the display panel is at least covered on a bending area, the protective film layer comprises a first protective layer and a second protective layer, the first protective layer is positioned between the second protective layer and the display panel, the thickness of the protective film layer is H, and H is more than or equal to 10 mu m and less than or equal to 50 mu m.

According to one aspect of the embodiments of the present application, the second protective layer has a thickness H1, H1 satisfying 5 μm.ltoreq.H2.ltoreq.40 μm. Preferably, the thickness of the second protective layer is H1, H1 satisfying 10 μm.ltoreq.H2.ltoreq.30μm.

According to one aspect of the embodiments of the present application, the first protective layer has a thickness D, D satisfying 0.5 μm.ltoreq.D.ltoreq.10 μm.

Preferably, the elastic modulus of the first protective layer is greater than the elastic modulus of the second protective layer.

According to one aspect of embodiments herein, the second protective layer includes a cured bondline and an extended film layer, the first protective layer and the extended film layer being bonded by the cured bondline.

Preferably, the material of the extensible film layer comprises one or more of polydimethylsiloxane, polyethylene terephthalate, polyborosiloxane, or boronated polydimethylsiloxane.

Preferably, the material of the cured bondline comprises a tackifying material.

According to one aspect of the embodiments of the present application, the first planar area includes a display area and a fan-out area, the fan-out area is located between the display area and the inflection area, and the protection film layer covers the fan-out area, the inflection area, and the second planar area.

In a second aspect, an embodiment of the present application further provides a display device, including a display module set as described above.

In a third aspect, an embodiment of the present application further provides a method for manufacturing a display panel, which is used for manufacturing the display panel according to the first aspect, where the manufacturing method includes: the display panel comprises a first plane area, a bending area and a second plane area which are distributed along a first direction, wherein the bending area is connected with the first plane area and the second plane area. At least the bending area is provided with a first protective layer towards one side. At least one side of the first protective layer away from the bending region is provided with a second protective layer. And bending the second plane area to the back surface of the first plane area, so that the first plane area and the second plane area are laminated, and the first direction is the length direction of the display panel.

According to an aspect of the embodiments of the present application, the first planar region includes a display region and a fan-out region distributed along a first direction, the fan-out region being located between the display region and the inflection region, and in the step of forming the first protection layer, the method includes: the first protection layer at least covers the fan-out area and the bending area.

Preferably, in the step of forming the second protective layer, it includes: arranging an adhesive layer and an extension film on one side of the first protective layer far away from the display panel, wherein the second protective layer covers the display area and the first protective layer; the adhesive layer covering the display area and the extension film are removed.

Preferably, the material of the extensible film layer adopts one or more of polydimethylsiloxane, polyethylene terephthalate, polyborosiloxane or boronated polydimethylsiloxane.

According to one aspect of the embodiments of the present application, in the step of removing the adhesive layer covering the display area and stretching the film, it includes: a light irradiation treatment is performed on one side of the display panel, and a first viscosity portion and a second viscosity portion are formed in the adhesive layer, wherein the viscosity of the first viscosity portion is smaller than that of the second viscosity portion. The first viscosity part is positioned in the display area, and the second viscosity part is positioned between the first protective layer and the extension film. The first viscosity part covered in the display area and the extension film are removed.

Preferably, in the step of forming the first protective layer, it includes: the first protection layer is made to cover the fan-out area, the bending area and the second plane area.

According to one aspect of the embodiments of the present application, the step of performing the light treatment on one side of the display panel includes: the material of the bonding layer arranged between the first protective layer and the extension film comprises a tackifying material, at least the area covered by the first protective layer is subjected to light treatment, and the bonding layer arranged between the first protective layer and the extension film forms a second viscosity part.

And/or the material of the bonding layer arranged between the display area and the extension film comprises an adhesion-reducing material, at least the area where the display area is positioned is subjected to light treatment, and the bonding layer between the display area and the extension film forms a first viscosity part.

According to the display module, the display device and the manufacturing method of the display module, the protective film layer is arranged on the display panel in a covering mode, and the second protective layer can effectively protect the bending area of the display panel and prevent the display panel from being invaded by water vapor. The first protective layer is located between the second protective layer and the bending area of the display panel, bending stress performance is adjusted for the bending area of the display module, the overall thickness of the protective film layer is limited to 10-50 mu m, the thickness of the protective film layer is reduced, the area of the non-display area occupied by the bending area of the display module is reduced, narrow frame design of the display module is achieved, and experience of a user is improved.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic top view of a display module according to some embodiments of the present disclosure;

FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1;

fig. 3 is a schematic structural diagram of a display module in a bent state according to some embodiments of the present application;

fig. 4 is an enlarged view of the portion Q of fig. 3;

fig. 5 is a schematic structural diagram of still another display module in a bent state according to some embodiments of the present disclosure;

fig. 6 is a flowchart illustrating a manufacturing method of a display module according to some embodiments of the present application;

fig. 7 is a flowchart illustrating a method for manufacturing a display module according to another embodiment of the present disclosure;

fig. 8a and 8b are sectional views illustrating steps of a method for manufacturing a display module according to some embodiments of the present disclosure;

fig. 9 is a flowchart illustrating a method for manufacturing a display module according to another embodiment of the present disclosure;

fig. 10a to 10c are sectional views illustrating steps of a method for manufacturing a display module according to some embodiments of the present disclosure.

Marking:

1. a display module;

10. a display panel; s1, a first plane area; s11, a display area; s12, a fan-out area; s2, bending areas; s3, a second plane area; 11. a first support; 12. a second support; 13. a flexible substrate; 131. a first portion; 132. a second portion; 133. a third section; 14. a wiring layer; 15. a device layer; 16. a circuit board;

20. a protective film layer; 21. a first protective layer; 22. a second protective layer; 221. curing the adhesive layer; 222. extending the film layer; n1, a tackifying material; n2, an adhesion-reducing material; 223. a bonding layer; 224. extending the film; 25. a light barrier; SA1, a first viscosity part; SA2, second viscosity unit;

30. a polarizing layer;

x, first direction.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and the specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

When the current flexible OLED display module is designed, a COP binding process (Chip On Pi Bending) is performed to bind a base film on a display panel with a drive chip IC, and the IC is bound on the base film at a certain distance; and then, performing a FOP binding process (FPC On COP Bending), binding a flexible circuit board FPC corresponding to the IC on the base film, and bending the base film to form the display module. However, the display panel formed by the process flow still has a certain frame on one or more sides, and the display panel brings poor user experience to consumers in the market pursuing a larger screen ratio.

The inventors have found in the study that a method of coating a glue material is generally adopted in the bending region, and bending is performed on the display panel when the glue material is not formed, so that bending stress required by the bending region is improved. However, the coated adhesive material cannot be bent after solidification, which limits the time required for the display module in the process. And the thickness of the coated glue material is between 80 micrometers and 100 micrometers due to the reason of a coating machine, and the thickness of the coated glue material is adjusted downwards again, so that the processing precision of the coating machine can be improved, and the cost of the coating machine is increased.

Therefore, in order to solve the above-mentioned problems, the embodiments of the present application provide a display module, a display device and a manufacturing method of the display module.

For better understanding of the present application, the first aspect is described in detail below with reference to fig. 1 to 10c, which illustrate a display module, a display device, and a method for manufacturing the display module according to an embodiment of the present application.

Fig. 1 is a schematic top view of a display module according to some embodiments of the present application. FIG. 2 is a schematic cross-sectional view of the structure A-A of FIG. 1. Fig. 3 is a schematic structural diagram of a display module in a bent state according to some embodiments of the present application.

As shown in fig. 1 to 4, the embodiment of the present application provides a display module 1 including: a display panel 10 and a protective film layer 20. The display panel 10 includes a first plane area S1, a bending area S2 and a second plane area S3. The inflection region S2 connects the first planar region S1 and the second planar region S3. The protective film layer 20 is at least covered on the bending area S2 on the display side of the display panel 10, the protective film layer 20 comprises a first protective layer 21 and a second protective layer 22, the first protective layer 21 is positioned between the second protective layer 22 and the display panel 10, the thickness of the protective film layer 20 is H, and H is more than or equal to 10 mu m and less than or equal to 50 mu m.

The display module 1 may be applied to a display module 1 such as a television, a mobile phone, a computer, a notebook computer, a tablet computer, a vehicle-mounted computer, a personal digital assistant (Personal Digital Assistant, PDA), etc., and the display device having the display module 1 is not limited in this application.

The display module 1 may include an OLED display panel, a quantum dot light emitting diode (Quantum Dot Light Emitting Diodes, QLED) display panel, and the like. The OLED display panel has advantages of small size, portability, realization of bending and folding, narrow frame, etc., and is increasingly applied to the field of high performance display. The following embodiments of the present application are explained by taking the display module 1 including an OLED display panel as an example.

On this basis, when the substrate in the OLED display panel is made of a flexible substrate material, the OLED display panel may be a flexible display panel. The following embodiments of the present application are explained by taking an OLED display panel as a flexible display panel as an example.

It should be noted that the flexible substrate material may include one or more of polyethylene terephthalate (Polyethylene terephthalate, PET), polyethylene naphthalate (Polyethylene naphthalate two formic acid glycol ester, PEN), polyimide (PI), and the like, which is not limited in the embodiments of the present application.

In some embodiments of the present application, as shown in fig. 2, the display module 1 may include a display panel 10, and the display panel 10 may include a first planar area S1, a bending area S2, and a second planar area S3.

The display panel 10 includes a first support 11, a second support 12, a flexible substrate 13, a trace layer 14, and a device layer 15.

In the first plane area S1 of the display panel 10, the first support 11, the first portion 131 of the flexible substrate 13, and the device layer 15 are sequentially stacked, and further, a portion of the wiring layer 14 and the protective film layer 20 are provided. The device layer 15 includes a driving circuit structure layer, a light emitting device layer, and an encapsulation layer; the driving circuit structure layer includes a thin film transistor. The light emitting device layer includes an anode, a light emitting layer, and a cathode. Since the driving circuit structure layer and the light emitting device layer are prior art, they will not be described here again.

In the bending region S2 of the display panel 10, the second portion 132 of the flexible substrate 13, the trace layer 14, and the protective film layer 20 are sequentially stacked. The trace layer 14 is electrically connected to the device layer 15.

In the second plane area S3 of the display panel 10, the second support 12, the third portion 133 of the flexible substrate 13, the portion of the wiring layer 14, and the portion of the protective film layer 20 are sequentially stacked. The second plane area S3 is a binding area for binding the driving chip and the circuit board 16, and the driving chip and the circuit board 16 control the operation of the display panel through the wiring layer 14 for displaying different pictures. Furthermore, it should be noted that the protective film 20 on the second planar region S3 is provided with a relief opening for relieving the driver chip and the circuit board 16, so that the driver chip and the circuit board 16 can be easily bonded.

As can be seen from the above, the flexible substrate 13 of the display panel 10 is made of a flexible material, so the display panel 10 is easily deformed, and the trace layer 14 is broken, thereby causing poor display. In order to prevent deformation of the display panel 10, in some embodiments of the present application, as shown in fig. 2, the first support 11 and the second support 12 under the display panel 10 may perform a bearing function on the display panel 10, preventing deformation of the device layer 15 of the display panel 10 and the third portion 133 of the display panel 10. In some embodiments of the present application, the protective film layer 20 includes a first protective layer 21 and a second protective layer 22, and the first protective layer 21 and the second protective layer 22 are sequentially laminated on the bending region S2 of the display panel 10. The first protective layer 21 may cover the material of the first protective layer 21 on the bent region of the display panel 10 by coating or the like. Specifically, the first protective layer 21 may be formed by coating in a slit coating manner.

It should be noted that, when the second protection layer 22 covers the bending region S2 of the display panel 10, the second protection layer 22 is a molded structure, the second protection layer 22 and the bending region S2 of the display panel 10 can be simultaneously bent at the same frequency, and the second protection layer 22 with the molded structure cannot be deformed irrecoverably during the bending process, so that the time requirement of the display panel 10 during the bending and fixing process is reduced. And the second protective layer 22 adopting the molding structure body reduces the thickness as much as possible under the premise of enough corrosion resistance in the manufacturing process, so as to reduce the overall thickness of the protective film layer 20, and the bending stress release performance required by the display module 1 in the bending region S2 is provided by the first protective layer 21, so that the requirement of the second protective layer 22 in terms of thickness is further reduced.

The thickness of the protective film layer 20 is H, and H is more than or equal to 10 mu m and less than or equal to 50 mu m. Alternatively, the thickness H of the protective film layer 20 may be 10 μm, 20 μm, 30 μm, 40 μm, and 50 μm.

It should be noted that, the thickness of the protective film 20 and the thickness of the protective film 20 appearing later are both the thicknesses of the protective film 20 following the bending of the display panel 10.

In some examples, the first protective layer 21 may extend from the inflection region S2 to a partial region in the first planar region S1; the first protection layer 21 may extend from the inflection region S2 to a partial region in the second plane region S3. It is understood that the second protection layer 22 may be disposed to extend above the first and second plane areas S1 and S3, thereby protecting the first protection layer 21.

The display module 1 further includes a polarizing layer 30, where the polarizing layer 30 is located on the light emitting side of the display panel 10. The protective film layer 20 extends from the bending region S2 toward the device layer 15, and the edge of the protective film layer 20 abuts against the edge of the polarizing layer 30, thereby increasing the bonding area of the protective film layer 20. When the display panel 10 is not bent, the edge of the protective film layer 20 may be in contact with the edge of the polarizing layer 30, and after the display panel 10 is bent, the edge of the protective film layer 20 is still in contact with the edge of the polarizing layer 30.

Optionally, an adhesive layer may be disposed on an edge side of the protective film layer 20, that is, a side where the protective film layer 20 abuts against the polarizing layer 30, so as to improve adhesive strength between the protective film layer 20 and the display panel 10 and improve adhesive reliability between the protective film layer 20 and the display panel 10.

According to the display module and the display device provided by the application, the protective film layer 20 is arranged on the display panel 10 in a covering manner, and the second protective layer 22 can effectively protect the bending area S2 of the display panel 10 and prevent the display panel 10 from being invaded by water vapor. The first protection layer 21 is located between the second protection layer 22 and the bending region S2 of the display panel 10, and adjusts bending stress performance for the bending region S2 of the display module, so that the overall thickness of the protection film layer 20 is limited to 10 μm to 50 μm, and the thickness of the protection film layer 20 is reduced, thereby reducing the area of the bending region S2 of the display module 1 occupying a non-display region, realizing narrow frame design of the display module 1, and improving the experience of a user.

In some alternative embodiments, as shown in FIGS. 3 and 4, the second protective layer 22 has a thickness H1, H1 satisfying 5 μm.ltoreq.H2.ltoreq.40 μm. Alternatively, the thickness H1 of the second protective layer 22 may be 5 μm, 10 μm, 15 μm, 20 μm … … 30 μm or 40 μm. Preferably, the thickness of the second protective layer 22 is H1, H1 satisfying 10 μm.ltoreq.H2.ltoreq.30μm. Alternatively, the thickness H1 of the second protective layer 22 may be 10 μm, 15 μm, 20 μm … … μm or 30 μm.

It should be noted that, the thickness of the second protective layer 22 occupies a certain specific gravity in the protective film layer 20, the thicker the thickness of the second protective layer 22, the thicker the thickness of the protective film layer 20, the larger the occupied frame space, the thinner the thickness of the second protective layer 22, and the thinner the thickness of the protective film layer 20, the poorer the corrosion resistance, the water vapor resistance, the oxidation resistance, and the like, and the bending stress performance provided to the bending region S2 can be achieved. In the display panel 10 of the present embodiment, the thickness of the second protection layer 22 is reduced as much as possible under the premise of ensuring the resistance and bending stress of the second protection layer 22, so as to reduce the frame size of the display module 1.

In some alternative embodiments, as shown in FIGS. 3 and 4, the first protective layer 21 has a thickness D, D satisfying 0.5 μm.ltoreq.D.ltoreq.10 μm. The thickness D of the first protective layer 21 may be, for example, 0.5 μm, 1 μm, 2 μm … … 5 μm or 10 μm. It should be noted that, the thinner the thickness of the first protective layer 21, the worse the adjusting effect of the first protective layer 21 on the stress generated in the bending process of the bending region S2; the thicker the first protective layer 21, the higher the required material cost, and the more difficult the installation of the display module, and the more difficult the bending.

In some alternative embodiments, the elastic modulus of the first protective layer 21 is greater than the elastic modulus of the second protective layer 22. The first protection layer 21 can adjust the stress received by the bending region S2 during the bending process, absorb the stress of the bending region, improve the bending stress release performance of the bending region, and reduce the possibility of breaking the substrate and the trace layer 14 in the bending region S2 in the bending state.

Fig. 5 is a schematic structural diagram of a display module in a bent state according to some embodiments of the present application.

In some alternative embodiments, as shown in fig. 5, the second protective layer 22 includes a cured adhesive layer 221 and an extension film layer 222, and the first protective layer 21 and the extension film layer 222 are bonded by the cured adhesive layer 221. The cured adhesive layer 221 may include a UV adhesive, a double-sided adhesive, a one-component modified silicone-type adhesive, a two-component modified silicone-type adhesive, and a hot melt-type adhesive. Preferably, the material of the cured bondline comprises a tackifying material.

In some alternative embodiments of the present application, the extensible film 222 may be a molded structure and the material of the extensible film 222 may comprise a synthetic material that is highly extensible.

Further, the material of the extension film layer 222 may include one or more of Polydimethylsiloxane (PDMS), polyethylene terephthalate (polyethylene glycol terephthalate, PET), polyborosiloxane, boronated Polydimethylsiloxane (PBDMS); preferably, the material of the extension film layer 222 in one embodiment is Polydimethylsiloxane (PDMS).

In the process of covering the second protective layer 22 on the display panel 10, the protective film 20 may be attached to the entire display panel 10 and the peripheral region of the display panel, and the unnecessary region of the protective film 20 on the peripheral region of the display panel 10 may be cut by laser, a cutter, or the like. Taking the cured adhesive layer 221 as an example, the cut first plane area S1, the bending area S2 and the second plane area S3 on the display panel 10 are covered with the protective film layer 20, and the partial areas of the first plane area S1 and the second plane area S3 on the display panel 10 are irradiated with UV ultraviolet light, so that the viscosity of the UV adhesive in the illumination area is reduced, and the protective film layer 20 in the area with low viscosity is removed, thereby realizing the manufacture of the protective film layer 20 in the bending area S2 of the display panel 10. Alternatively, a dividing line may be disposed on the second protective layer 22, where the dividing line is located at the junction between the to-be-torn-off region and the to-be-reserved region, and the dividing line is located at an end of the polarizing layer facing the bending region.

Fig. 5 is a schematic structural diagram of a display module in a bent state according to some embodiments of the present application.

In some alternative embodiments, as shown in fig. 5, the first planar region S1 includes a display region S11 and a fan-out region S12, the fan-out region S12 is located between the display region S11 and the inflection region S2, and the protection film layer 20 covers the fan-out region S12, the inflection region S2, and the second planar region S3.

In the embodiment of the present application, the first plane area S1 includes a display area S11 and a fan-out area S12, and specifically, the display area S11 is used for displaying a screen of the display panel 10. The fan-out region S12 is located between the display region S11 and the inflection region S2, and in some examples, some of the functional traces in the display region S11 may extend from within the display region S11 into the second planar region S2 through the fan-out region S12. Optionally, the second planar area S3 is a binding area, and the functional trace in the display area S11 may be connected to the chip in the binding area. The protection film layer 20 covers the fan-out area S12, the bending area S2 and the second plane area S3, so that the connection strength between the protection film layer 20 and the display panel 10 in the bending process of the display panel 10 can be further improved, and the reliability of the protection film layer 20 is improved. In a second aspect, an embodiment of the present application further provides a display device, including any one of the display modules described above.

Fig. 6 is a flowchart illustrating a method for manufacturing a display module according to an embodiment of the invention.

As shown in fig. 6, in a third aspect, an embodiment of the present application further provides a method for manufacturing a display module, where the method includes: step S110 to step S140.

In step S110, a display panel is provided, where the display panel includes a first plane area, a bending area and a second plane area distributed along a first direction, and the bending area connects the first plane area and the second plane area.

In step S120, a first protective layer is formed at least on one side of the bending region.

In some embodiments, the first protective layer may be disposed in a predetermined region of the inflection region S2 through a coating process or the like.

In step S130, a second protective layer is formed on at least one side of the first protective layer away from the bending region.

In some embodiments, the second protective layer 22 is a laminate structure and may include an adhesive layer 223 and an extensible film layer 224 on the adhesive layer 223. In other embodiments, the second protection layer 22 is a single-layer structure, and the second protection layer 22 is covered over the first protection layer 21 by electrostatic adsorption.

In step S140, the second planar area is folded to the back surface of the first planar area, so that the first planar area and the second planar area are stacked, and the first direction is the length direction of the display panel.

In some embodiments, as shown in fig. 3, the bending region S2 and the second plane region S3 bend towards a side away from the light-emitting surface, and the bending region S2 bends according to a preset bending axis, so that the first plane region S1 and the second plane region S3 may be stacked. It can be understood that the back surface of the first plane area S1 is a surface of the display panel 10 facing away from the display surface.

Fig. 7 is a flowchart illustrating a manufacturing method of a display module according to some embodiments of the present application. Fig. 8a and fig. 8b are cross-sectional views illustrating steps of a method for manufacturing a display module according to some embodiments of the present application.

In some alternative embodiments, the first planar area includes a display area and a fan-out area distributed along the first direction, the fan-out area being located between the display area and the inflection area, and in step S120, step S121 is included.

In step S121, the first protection layer is made to cover at least the fan-out area and the folded area.

In some embodiments, the first protection layer 21 covers the fan-out area S12 and the bending area S2, and the first protection layer 21 can enhance the bending release performance of the bending area S2 of the display panel, and reduce the possibility of damage to the film layers in the fan-out area S12 and the bending area S2 of the display panel 10.

In some alternative embodiments, as shown in fig. 7, in step S130, step S131 and step S132 are included.

In step S131, an adhesive layer and an extension film are disposed on a side of the first protective layer away from the display panel, and the second protective layer covers the display area and the first protective layer.

In some embodiments, as shown in fig. 8a and 8b, an adhesive layer 223 and an extension film 224 are provided at a side of the first protective layer 21 remote from the display panel 10, and in particular, the extension film 224 is connected to the first protective layer 21 through the adhesive layer 223. It will be appreciated that the stretch film 224 and the adhesive layer 223 together form the second protective layer 22. The second protective layer 22 covers the display area S11 and the first protective layer 21, and in particular, the second protective layer 22 is disposed on the display area of the display panel 10 and the side of the first protective layer 21 away from the display panel 10, and the second protective layer 22 is bonded to the display panel 10 by the adhesive layer 223 in the second protective layer 22. Alternatively, the coverage area of the second protection layer 22 may be larger than the entire area of the display panel 10, in other words, the second protection layer 22 may cover the display panel 10 and a blank area of the display panel 10, where the blank area is an area beyond the display panel 10, in the process of covering the display panel 10, so as to reduce the alignment accuracy of the second protection layer 22 in the manufacturing process; in the bonding process, a roller bonding or vacuum ESC (electronic stability control) mode can be used for bonding; alternatively, when the peripheral side margin area of the display panel 10 is covered with the second protective layer 22, the second protective layer 22 of the peripheral side margin area of the display panel 10 may be removed by means of a laser, a cutter, or the like.

In step S132, the adhesive layer and the extension film covering the display area are removed.

In some examples, the adhesive layer 223 and the extension film 224 of the display area S11 are removed, and the adhesive layer 223 and the extension film 224 of the display area S11 may be removed simultaneously, for example, by hand, by an instrument, or the like. Of course, a dividing line may be provided between the first display area S11 and the bending area S2, and the adhesive layer 223 and the extension film 224 of the display area S11 may be removed by the dividing line. Optionally, the split line comprises a half-cut line.

Fig. 9 is a flowchart illustrating a manufacturing method of a display module according to another embodiment of the present disclosure.

In some alternative embodiments, as shown in fig. 8b and 9, in step S132, steps S151 to S152 are included.

In step S151, a light irradiation treatment is performed on one side of the display panel, and a first viscosity portion and a second viscosity portion are formed in the adhesive layer, the first viscosity portion having a viscosity smaller than that of the second viscosity portion. The first viscosity part is positioned in the display area, and the second viscosity part is positioned between the first protective layer and the extension film.

In some embodiments, as shown in fig. 10a, when the material of the adhesive layer 223 is an ultraviolet light adhesive, when the side of the second protective layer 22 away from the display panel 10 is subjected to mask ultraviolet light irradiation, the second protective layer 22 may be subjected to mask treatment by using the light barrier 25, so that after the second protective layer 22 is subjected to ultraviolet light irradiation, the viscosity of the first viscosity portion SA1 formed in the adhesive layer 223 is less than the viscosity of the second viscosity portion SA2. Optionally, the materials in the adhesive layer 223 are all adhesion-reducing materials, and after ultraviolet light irradiation, the adhesion of the area which is not blocked by the light barrier 25 is smaller than that of the area which is blocked by the light barrier 25.

Note that, in the embodiment of the present application, specific materials of the light barrier 25 are not limited, and only the light leakage area of the light barrier 25 needs to be satisfied for forming the first viscosity portion SA1. In addition, the embodiment of the application does not limit specific parameters of ultraviolet irradiation, and only needs to determine optimal absorption light waves and energy according to the characteristics of the photoinitiator, so that the crosslinking reaction in the material after the irradiation treatment is ensured to be complete. Illustratively, the ultraviolet light has a wavelength of 365nm and an energy range of 300mj to 1000mj.

In step S152, the first viscosity part and the extension film covered in the display area are removed.

In some examples, the first viscosity portion SA1 and the extension film 224 located within the display area S11 are partially removed, for example, by manual tearing or by an instrument. Specifically, a dividing line may be disposed on the stretched film 224, and the first viscosity portion SA1 may be removed after the stretched film is irradiated with light, where the dividing line may be located at an end of the polarizing layer 30 facing the bending region S2.

Further, in step S120, step S122 is included.

In step S122, the first protection layer is made to cover the fan-out area, the inflection area, and the second plane area.

Specifically, as shown in fig. 10a, the first protection layer 21 covers the fan-out area S12, the bending area S2 and the second plane area S3, so as to further increase the bending release performance of the fan-out area S12, the bending area S2 and the second plane area S3 in the display panel 10, which is beneficial to improving the reliability of the display panel 10 after bending. It can be understood that the first protection layer 21 covers the fan-out area S12, the bending area S2 and the second planar area S3, the second protection layer 22 is located on a side of the first protection layer 21 away from the display panel 10, and the second protection layer 22 also covers the fan-out area S12, the bending area S2 and the second planar area S3. Alternatively, the first protective layer 21 and the second protective layer 22 may be located at a partial region of the second planar region S3.

In some alternative embodiments, step S1511 is included in step S151.

In step S1511, as shown in fig. 10a to 10c, the material of the adhesive layer disposed between the first protective layer and the stretched film includes a tackifying material, at least the area covered by the first protective layer is subjected to light irradiation treatment, and the adhesive layer disposed between the first protective layer and the stretched film forms a second viscosity portion. And/or the material of the bonding layer arranged between the display area and the extension film comprises an adhesion-reducing material, at least the area where the display area is positioned is subjected to light treatment, and the bonding layer arranged between the display area and the extension film forms the first viscosity part.

In some embodiments, the materials in the adhesive layer 223 may be the adhesion promoting materials N1, as shown in fig. 10b, the light barrier 25 may block the display area S11, so that the ultraviolet light irradiates the area of the display panel 10 except the display area S11, and after the adhesive layer 223 is irradiated by the ultraviolet light, the adhesion of the adhesive layer 223 is enhanced in the area of the display panel 10 except the display area S11, so as to form the second adhesive portion SA2. Illustratively, when the first protective layer 21 covers the fanout area S12 and the inflection area S2, the second viscosity portion SA2 is located at the fanout area S12 and the inflection area S2. When the first protection layer 21 covers the fan-out region S12, the inflection region S2, and the second plane region S3, the second viscosity region is located at the fan-out region S12, the inflection region S2, and the second plane region S3.

Further, the materials of the adhesive layers 223 may be all the adhesion-reducing materials N2. As shown in fig. 10a, the light barrier 25 blocks the fan-out area S12 and a side of the fan-out area S12 facing away from the display area S11, so that ultraviolet light irradiates the display area S11, and after the adhesive layer 223 is irradiated by the ultraviolet light, the viscosity of the adhesive layer 223 in the display area S11 is reduced, thereby forming a first viscosity portion SA1. The tackiness of the adhesion-reducing material N2 may be reduced from 200gf to 1gf to 5gf after irradiation with ultraviolet light.

In some alternative embodiments, as shown in fig. 10c, the material of the adhesive layer 223 may be both a tackifying material N1 and a tackifying material N2. The adhesion-reduction material N2 is disposed in the adhesive layer 223 in a region to be removed, and the adhesion-reduction material N2 is disposed in the display area S11, for example. The adhesion promoting material N1 is disposed in the area where the adhesion promoting layer 223 needs to remain, and illustratively, the adhesion promoting material N1 is disposed in the fan-out area S12, the bending area S2, and the second planar area S3. When the adhesion-promoting material N2 and the adhesion-promoting material N1 are simultaneously provided in the adhesive layer 223, the ultraviolet light may be directly irradiated to the side of the second protective layer 22 facing away from the display panel 10, the mask process using the light barrier 25 is not required, the area to be removed after the ultraviolet light irradiation is reduced in viscosity, the area to be removed is removed, the area to be retained is increased in viscosity, and the cured adhesive layer 221 and the extension film layer 222 are formed.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A display module, comprising:

the display panel comprises a first plane area, a bending area and a second plane area, wherein the bending area is connected with the first plane area and the second plane area;

the display panel comprises a display panel, a display area and a protective film layer, wherein the display side of the display panel is at least covered on the display area, the protective film layer comprises a first protective layer and a second protective layer, the first protective layer is positioned between the second protective layer and the display panel, the thickness of the protective film layer is H, and H is more than or equal to 10 mu m and less than or equal to 50 mu m.

2. The display module according to claim 1, wherein the thickness of the second protective layer is H1, H1 satisfies 5 μm and H1 and 40 μm;

preferably, the thickness of the second protective layer is H1, and H1 is 10 μm or less and H1 is 30 μm or less.

3. The display module according to claim 1, wherein the first protective layer has a thickness D, D satisfying 0.5 μm and D and 10 μm;

preferably, the elastic modulus of the first protective layer is greater than the elastic modulus of the second protective layer.

4. The display module of claim 1, wherein the second protective layer comprises a cured glue layer and an extended film layer, the first protective layer and the extended film layer being bonded by the cured glue layer;

preferably, the material of the extensible film layer comprises one or more of polydimethylsiloxane, polyethylene terephthalate, polyborosiloxane, or boronated polydimethylsiloxane;

preferably, the material of the cured bondline comprises a tackifying material.

5. The display module of claim 1, wherein the first planar region comprises a display region and a fan-out region, the fan-out region is located between the display region and the inflection region, and the protective film layer covers the fan-out region, the inflection region, and the second planar region.

6. A display device comprising a display module according to any one of claims 1 to 5.

7. The manufacturing method of the display module is characterized by comprising the following steps:

providing a display panel, wherein the display panel comprises a first plane area, a bending area and a second plane area which are distributed along a first direction, and the bending area is connected with the first plane area and the second plane area;

forming a first protection layer at least on one side of the bending region;

forming a second protective layer at least on one side of the first protective layer far away from the bending region;

bending the second plane area to the back surface of the first plane area, and enabling the first plane area and the second plane area to be stacked;

the first direction is the length direction of the display panel.

8. The method of claim 9, wherein the first planar region includes a display region and a fan-out region distributed along the first direction, the fan-out region being located between the display region and the inflection region,

in the step of forming the first protective layer, comprising: covering at least the fan-out region and the inflection region with the first protective layer;

preferably, in the step of forming the second protective layer, it includes: arranging an adhesive layer and an extension film on one side of the first protective layer far away from the display panel, wherein the second protective layer covers the display area and the first protective layer;

removing the adhesive layer and the extension film covering the display area;

preferably, the material of the extensible film layer adopts one or more of polydimethylsiloxane, polyethylene terephthalate, polyborosiloxane or boronated polydimethylsiloxane.

9. The method of manufacturing a display module according to claim 8, wherein the step of removing the adhesive layer and the extension film covering the display area comprises:

performing light irradiation treatment on one side of the display panel, and forming a first viscosity part and a second viscosity part in the adhesive layer, wherein the viscosity of the first viscosity part is less than that of the second viscosity part; the first viscosity part is positioned in the display area, and the second viscosity part is positioned between the first protective layer and the extension film;

removing the first viscosity part and the extension film covered in the display area;

preferably, in the step of forming the first protective layer, it includes: and enabling the first protection layer to cover the fan-out area, the bending area and the second plane area.

10. The method according to claim 9, wherein the step of performing the light treatment on the side of the second material facing away from the display panel comprises:

the material of the bonding layer arranged between the first protective layer and the extension film comprises a tackifying material, at least the area covered by the first protective layer is subjected to light treatment, and the bonding layer arranged between the first protective layer and the extension film forms the second viscosity part;

and/or the material of the adhesive layer arranged between the display area and the extension film comprises an adhesion-reducing material, at least the area where the display area is positioned is subjected to light treatment, and the adhesive layer arranged between the display area and the extension film forms the first viscosity part.

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