Display module and display device

Abstract

The application provides a display module and a display device. The display module comprises a cover plate, a display panel located on one side of the cover plate, an ultra-clean foam composite layer located on a side of the display panel away from the cover plate, and a protective film layer located on a surface of the ultra-clean foam composite layer away from the display panel. In a direction of the display panel away from the cover plate, the protective film layer comprises a first adhesive layer, a first polymer layer, a second adhesive layer, and a second polymer layer which are sequentially stacked. The protective film in the display module comprises a multi-layer structure, and the film layers for protection are divided into a first polymer layer and a second polymer layer. In the process of lamination, the first polymer layer can be well laminated with the ultra-clean foam composite layer, and lamination film printing is not prone to occur. After the overall lamination of the protective film layer, peeling between the film layers is not prone to occur, and bubbles are not prone to occur between the protective film layer and the ultra-clean foam composite layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular, to a display module and a display device. BACKGROUND

[0002] The OLED (Organic Light Emitting Diode) display module structure of a display device such as a mobile phone mainly comprises a CG (cover plate), a panel and a SCF (Super Clean Foam) structure. The SCF structure is attached to a protective film away from the surface of the cover plate. The protective film (non-flexible circuit board position) of the SCF is torn off when the display device is assembled. At present, the protective film of the SCF is prone to cause a high film printing level when attached to the surface of the metal layer of the SCF. In addition, there may be film layer peeling or air gap between the protective film and the SCF after attachment, which affects the subsequent assembly of the whole machine.

[0003] Therefore, the current display module and display device still need to be improved. SUMMARY

[0004] The present application aims to at least alleviate one of the technical problems in the related art.

[0005] In one aspect of the present application, a display module is provided. According to an embodiment of the present application, the display module comprises: a cover plate; a display panel located on one side of the cover plate; a super clean foam composite layer located on a side of the display panel away from the cover plate; and a protective film layer located on a surface of the super clean foam composite layer away from the display panel. In the direction of the display panel away from the cover plate, the protective film layer comprises a first adhesive layer, a first polymer layer, a second adhesive layer and a second polymer layer which are sequentially stacked. Thus, the protective film layer in the display module comprises a multi-layer structure, and the film layers for protection are divided into the first polymer layer and the second polymer layer. In the attachment process, the first polymer layer can be well attached to the super clean foam composite layer, and is not prone to cause film printing. After the overall attachment of the protective film layer, the film layer peeling problem between the film layers is not prone to occur, and air bubbles are not prone to occur between the protective film layer and the super clean foam composite layer.

[0006] According to an embodiment of the present application, the thickness of the first polymer layer is denoted as H1, and the thickness of the second polymer layer is denoted as H2. H1 and H2 satisfy the following condition: H2≥1.5H1. The first polymer layer is relatively thin, which is conducive to improving the attachment of the protective film layer to the super clean foam composite layer. The second polymer layer is relatively thick, which can better protect the super clean foam composite layer.

[0007] According to an embodiment of the present application, the display module satisfies at least one of the following conditions: the material of the first polymer layer comprises polyethylene terephthalate; the material of the second polymer layer comprises polyethylene terephthalate; 20 μm≤H1≤30 μm; 45 μm≤H2≤55 μm. Thus, the overall performance of the display module can be further improved.

[0008] According to an embodiment of the present application, the thickness of the first adhesive layer is denoted as H3, and the thickness of the second adhesive layer is denoted as H4. The thickness of the first adhesive layer satisfies the following condition: 8 μm≤H3≤10 μm, and / or the thickness of the second adhesive layer satisfies the following condition: 10 μm≤H4≤15 μm. The first adhesive layer and / or the second adhesive layer within the above thickness range can have a better bonding effect, so that the protective film layer can have a better protection effect.

[0009] According to an embodiment of the present application, the peeling force of the first adhesive layer is denoted as a, and the peeling force of the second adhesive layer is denoted as b. a and b satisfy the following condition: b≥24a. The peeling force of the first adhesive layer is small, which is conducive to reducing the difficulty of subsequent film tearing. The peeling force of the second adhesive layer is large, so that the protective film layer is not easy to delaminate during subsequent film tearing.

[0010] According to an embodiment of the present application, the peeling force a of the first adhesive layer and the peeling force b of the second adhesive layer satisfy the following condition: 15 gf / inch≤a≤25 gf / inch, b≥600 gf / inch. The peeling force of the first adhesive layer is small, so that a small force can be used to peel off the protective film layer before assembling the whole machine. The peeling force of the second adhesive layer is large, so that the bonding force between the first polymer layer and the second polymer layer is strong, and the protective film layer is not easy to delaminate during film tearing.

[0011] According to an embodiment of the present application, the cover plate is a curved cover plate. The protective film layer can be applied to a curved display module, and the protective film layer can also be well attached to the ultra-clean foam composite layer in the arc region.

[0012] According to an embodiment of the present application, the display module further comprises an optical transparent adhesive layer, which is located between the cover plate and the display panel. The display panel and the cover plate can be bonded by the optical transparent adhesive layer, and the optical transparent adhesive layer has good light transmission performance, which is conducive to improving the display effect of the display module.

[0013] According to an embodiment of the present application, the protective film layer has a planar portion and at least one curved portion, the curved portion is located at an edge region of the protective film layer, the edge region of the second polymer layer has at least one welt, the welt includes a plurality of spaced hollows, the welt is parallel to the boundary line of the planar portion and the curved portion, and the welt has an overlapping region with the curved portion. In this way, by arranging the welt, the stress of the film layer in the arc region can be better released, so that the protective film layer is more flat, and the adhesion with the super-clean foam composite layer is higher.

[0014] According to an embodiment of the present application, the edge region of the second polymer layer has a first welt, the first welt has an overlapping region with the boundary line of the planar portion and the curved portion, and the first welt is parallel to the boundary line of the planar portion and the curved portion; and / or, the edge region of the second polymer layer has a second welt, the second welt is parallel to the boundary line of the planar portion and the curved portion, the curved portion away from the surface of the cover plate has a center line, the center line is a line connecting the midpoints of two oppositely arranged edges on the surface of the curved portion away from the cover plate, the center line is parallel to the boundary line of the planar portion and the curved portion, and the second welt has an overlapping region with the center line. By arranging the welt on the second polymer layer, on the one hand, the stress of the arc region of the second polymer layer can be released, and on the other hand, the welt adhesion mark can be absorbed by the second adhesive layer, so that the welt adhesion mark cannot be transmitted to the super-clean foam composite layer, thereby avoiding forming a film mark on the super-clean foam composite layer or the optically transparent adhesive layer.

[0015] According to an embodiment of the present application, the protective film layer has a tear-off portion, so that when the whole machine needs to be assembled, the protective film layer can be torn off by starting to apply force from the tear-off portion.

[0016] In another aspect of the present application, a display device is provided. According to some embodiments of the present application, the display device is a whole machine obtained by assembling the display module after tearing off the protective film layer of the display module. In this way, the cover plate, the display panel, the super-clean foam composite layer and other structures in the display device do not have obvious film marks, which is beneficial to improve the production yield of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structural schematic diagram of a display module in the related art is shown;

[0018] Figure 2 A partial structural schematic diagram of a display module in the related art is shown;

[0019] Figure 3 A structural schematic diagram of a display module according to an embodiment of the present application is shown.

[0020] Figure 4 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0021] Figure 5 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0022] Figure 6 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0023] Figure 7 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0024] Figure 8 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0025] Figure 9 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0026] Figure 10 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0027] Figure 11 A structural schematic diagram of a display module according to another embodiment of the present application is shown;

[0028] Figure 12 A structural schematic diagram of a saddle stitch is shown according to an embodiment of the present application;

[0029] Figure 13 A structural schematic diagram of a saddle stitch is shown according to another embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 100: cover plate; 200: display panel; 300: super-clean foam composite layer; 310: third adhesive layer; 320: buffer layer; 330: heat dissipation layer; 400: protective film layer; 410: first adhesive layer; 420: first polymer layer; 430: second adhesive layer; 440: second polymer layer; 401: planar portion; 402: curved portion; 450: tear hand portion; 10: SCF protective film; 11: adhesive layer; 12: polymer layer; 20: gap; 50: saddle stitch; 50-1: first saddle stitch; 50-2: second saddle stitch; 51: hollowed portion; 1: boundary line; 2: first edge line; 3: second edge line; 4: third edge line; 5: center line; A: midpoint of the second edge line; B: midpoint of the third edge line. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below. The embodiments described below are exemplary only and are not intended to limit the present application, which can be embodied in various ways without departing from the spirit thereof. Unless otherwise defined, technical and scientific terms used herein have the same meaning as those of the documents cited in the description or those of the products.

[0033] In the related art, referring to Figure 1 , the super-clean foam composite layer 300 of the display module is arranged on the side of the display panel 200 away from the cover plate 100. Before assembling the display device, a super clean foam (SCF) protective film 10 is arranged on the side of the super-clean foam composite layer 300 away from the cover plate 100. The SCF protective film 10 is composed of an adhesive layer 11 and a polymer layer 12. If the SCF protective film 10 is thin, when it is attached to the surface of the super-clean foam composite layer 300, the optical transparent adhesive layer 500 will be deformed obviously due to the poor strength and supportability of the SCF protective film 10, and the level of the attached film will be high, thereby affecting the yield of the display module. If the SCF protective film 10 is thick, when it is attached to the surface of the super-clean foam composite layer 300, the film layer will be easily peeled off, and air bubbles will be generated. When the display module has an arc-shaped area, referring to Figure 2 , the film layer between the SCF protective film 10 and the super-clean foam composite layer 300 will be easily peeled off, and obvious gaps 20 will be generated. When assembling the whole machine, a circle of glue is usually applied to the periphery of the display panel 200 to prevent water. If there are gaps 20 between the film layers, the glue will be siphoned between the super-clean foam composite layer 300 and the SCF protective film 10 after the glue is applied. After the SCF protective film 10 is torn off, the glue will remain on the surface of the super-clean foam composite layer 300, thereby affecting the assembly of the whole machine.

[0034] In order to at least alleviate or even solve at least one of the above technical problems, in one aspect of the present application, the present application provides a display module. According to some embodiments of the present application, referring to Figures 3 to 6 , the display module can include a cover plate 100, a display panel 200, a super-clean foam composite layer 300, and a protective film layer 400. The display panel 200 is located on one side of the cover plate 100. The super-clean foam composite layer 300 is located on the side of the display panel 200 away from the cover plate 100. The protective film layer 400 is located on the surface of the super-clean foam composite layer 300 away from the display panel 200. The protective film layer 400 is arranged in the direction away from the cover plate 100 of the display panel 200 (for example, the direction of the arrow A in the figure). Figure 3 and Figure 4In the X direction shown in the figure), the protective film layer 400 can include a first adhesive layer 410, a first polymer layer 420, a second adhesive layer 430, and a second polymer layer 440 which are sequentially stacked. The protective film layer has two polymer layers, which can provide good protection on one hand, and the first polymer layer can be made relatively thin, which is close to the super-clean foam composite layer when the film layer is attached to the surface of the super-clean foam composite layer, which is conducive to improving the matching degree of the film layer attachment, and is not prone to film layer peeling and air gap at the attachment interface. The sum of the thicknesses of the two polymer layers is not too thin, and the attachment film is not prone to cause obvious attachment film printing.

[0035] According to some embodiments of the present application, the display panel 200 can be an OLED (Organic Light-Emitting Diode) display panel.

[0036] According to some embodiments of the present application, referring to Figures 4 to 6 , the display module can further include an optically transparent adhesive layer 500 between the cover plate 100 and the display panel 200. The optically transparent adhesive layer has good adhesion, which can firmly bond the display panel to the surface of the cover plate, and the optically transparent adhesive layer has good light transmission, which is conducive to improving the display effect of the display panel.

[0037] According to some embodiments of the present application, referring to Figures 3 to 5 , the cover plate 100 of the display module can be a flat cover plate. According to some other embodiments of the present application, referring to Figure 6 , the cover plate 100 of the display module can be a curved cover plate.

[0038] According to some embodiments of the present application, the cover plate 100 of the display module can be a glass cover plate.

[0039] According to some embodiments of the present application, referring to Figure 5 , in the X direction, the super-clean foam composite layer 300 can include a third adhesive layer 310, a buffer layer 320, and a heat dissipation layer 330 which are sequentially arranged. According to some embodiments of the present application, the material of the buffer layer 320 can include foam for buffering stress acting on the display panel. According to some embodiments of the present application, the material of the heat dissipation layer 330 can include at least one of copper or stainless steel, for example, the material of the heat dissipation layer 330 can be copper foil or stainless steel sheet, the heat dissipation layer 330 can dissipate heat generated by the display panel during operation to the external environment, avoiding the display panel from being too hot.

[0040] According to some embodiments of the present application, referring to Figure 3 and Figure 4The thickness of the first polymer layer 420 is denoted as H1, and the thickness of the second polymer layer 440 is denoted as H2, and H1 and H2 satisfy the following condition: H2 > H1. The first polymer layer is arranged close to the heat dissipation layer of the ultra-clean foam composite layer, and the first polymer layer is relatively thin and has high adhesion to the heat dissipation layer, so that the first polymer layer can be well adhered to the heat dissipation layer even in the arc-shaped area, and film layer peeling or air gap is less likely to occur.

[0041] According to some embodiments of the present application, the thickness H1 of the first polymer layer 420 and the thickness H2 of the second polymer layer 440 satisfy the following condition: H2 ≥ 1.5H1. The thickness of the first polymer layer is relatively thin compared to the second polymer, which is beneficial to improve the adhesion flatness of the protective film layer to the ultra-clean foam composite layer.

[0042] According to some embodiments of the present application, the material of the first polymer layer 420 can include polyethylene terephthalate (PET). According to some embodiments of the present application, the material of the second polymer layer 440 can include polyethylene terephthalate. The first polymer layer and / or the second polymer layer having the above-mentioned material can protect the display panel and the ultra-clean foam composite layer, and the use of PET, which is relatively inexpensive, as the material of the polymer layer of the protective film is beneficial to reduce the cost of the display module.

[0043] According to some embodiments of the present application, the thickness H1 of the first polymer layer 420 can be 20-30 μm, for example, the thickness H1 of the first polymer layer 420 can be 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, etc. The thickness of the first polymer layer in the above range is beneficial to further improve the adhesion flatness of the protective film layer to the ultra-clean foam composite layer, thereby improving the protection of the display panel and the ultra-clean foam composite layer.

[0044] According to some embodiments of the present application, the thickness H2 of the second polymer layer 440 can be 45-55 μm, for example, the thickness H2 of the second polymer layer 440 can be 45 μm, 47 μm, 50 μm, 53 μm, 55 μm, etc. The thickness of the second polymer layer in the above range can further improve the protection of the protective film layer.

[0045] According to some embodiments of the present application, referring to Figure 3 and Figure 4 , the thickness of the first adhesive layer 410 is denoted as H3, and the thickness of the second adhesive layer 430 is denoted as H4.

[0046] According to some embodiments of the present application, the thickness H3 of the first adhesive layer 410 can be 8-10 μm, for example, the thickness H3 of the first adhesive layer 410 can be 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, etc. The thickness of the first adhesive layer is set in the above range, which is beneficial to improve the flatness of the surface of the protective film layer and the ultra-clean foam composite layer.

[0047] According to some embodiments of the present application, the thickness H4 of the second adhesive layer 430 can be 10-15 μm, for example, the thickness H4 of the second adhesive layer 430 can be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc. Thus, the thickness of the second adhesive layer is set in the above range, the first polymer layer and the second polymer layer have better flatness, which is beneficial to improve the flatness of the overall protective film layer; when the second polymer layer is designed to have a welt (the welt can include a plurality of spaced hollow parts), the second adhesive layer with the above thickness can well absorb the film print of the welt, so that the film print is not transferred to the surface of the ultra-clean foam composite layer to form a poor film print.

[0048] According to some embodiments of the present application, the material of the first adhesive layer 410 and the second adhesive layer 430 can be the same, the thickness H3 of the first adhesive layer 410 is less than the thickness H4 of the second adhesive layer 430, thus, the second adhesive layer is thicker, the peeling force of the second adhesive layer is larger, which can better bond the first polymer layer and the second polymer layer, and when the protective film layer is peeled, the first polymer layer and the second polymer layer are not prone to film layer peeling problems.

[0049] According to some specific embodiments of the present application, the thickness H3 of the first adhesive layer 410 can be 8-10 μm, the thickness H1 of the first polymer layer 420 can be 25 μm, the thickness H4 of the second adhesive layer 430 can be 10-15 μm, and the thickness H2 of the second polymer layer 440 can be 50 μm.

[0050] According to some embodiments of the present application, the peeling force of the first adhesive layer 410 is denoted as a, and the peeling force of the second adhesive layer 430 is denoted as b, wherein a and b satisfy the following condition: b≥24a, the first adhesive layer directly contacts the ultra-clean foam composite layer, the peeling force of the first adhesive layer is smaller, when the whole machine needs to be assembled, the protective film layer can be torn off by a smaller force, and the adhesive residue is not easy to be left on the surface of the ultra-clean foam composite layer; the peeling force of the second adhesive layer is larger, which is beneficial to improve the bonding strength of the first polymer layer and the second polymer layer, and the first polymer layer and the second polymer layer are not prone to film layer peeling problems when tearing the film.

[0051] According to some embodiments of the present application, the peeling force a of the first adhesive layer 410 can satisfy the following condition: 15 gf / inch ≤ a ≤ 25 gf / inch, for example, the peeling force a of the first adhesive layer 410 can be 15 gf / inch, 18 gf / inch, 20 gf / inch, 22 gf / inch, 25 gf / inch, etc., the peeling force of the first adhesive layer is set in the above range, the protective film layer can be bonded on the surface of the super-clean foam composite layer, and the protective film layer can be peeled off by a small force.

[0052] According to some embodiments of the present application, the peeling force b of the second adhesive layer 430 can satisfy the following condition: b ≥ 600 gf / inch, for example, the peeling force b of the second adhesive layer 430 can be 600 gf / inch, 620 gf / inch, 650 gf / inch, 670 gf / inch, 700 gf / inch, etc., so that a strong bonding effect can be formed between the first polymer layer and the second polymer layer, which is beneficial to improve the overall stability of the protective film layer, and the first polymer layer and the second polymer layer are not prone to film peeling problems when the film is torn, and the first polymer layer and the second polymer layer can be easily torn off as a whole.

[0053] The specific composition of the first adhesive layer and the second adhesive layer is not specifically limited in the present application, and those skilled in the art can set and adjust it according to actual needs. In some embodiments of the present application, the material of the first adhesive layer can be a silicone system adhesive, and the material of the second adhesive layer can also be a silicone system adhesive. The above adhesive can have good antistatic effect, so that the display module is not prone to static damage and other problems.

[0054] According to some embodiments of the present application, referring to Figures 6 to 11 , the cover plate 100 is a curved cover plate, the protective film layer 400 can have a planar portion 401 and at least one curved portion 402, the curved portion 402 is located at the edge region of the protective film layer 400, the edge region of the second polymer layer 440 has at least one welt line 50, wherein the welt line 50 can include a plurality of spaced hollow portions 51 (as shown in Figure 12 and Figure 13 ), the welt line 50 is parallel to the boundary line 1 of the planar portion 401 and the curved portion 402, and the welt line 50 has an overlapping area with the curved portion 402. The second polymer layer 440 can be punched by a punching die to form a plurality of spaced through holes, so as to obtain the welt line. The welt line has an overlapping area with the curved portion, which means that at least a part of the welt line is located in the area where the curved portion is located. Therefore, the welt line can at least release the stress of the second polymer layer in the arc region to some extent, and the small hollow portion of the welt line can be absorbed by the second adhesive layer without being transmitted to the surface of the super-clean foam composite layer, so that the film mark is not easy to form.

[0055] According to some embodiments of the present application, referring to Figures 6 to 11 , the protective film layer 400 can have two curved sections 402. According to some other embodiments of the present application, the protective film layer can also have one, three or four curved sections.

[0056] According to some embodiments of the present application, the protective film layer 400 has two curved sections 402, the edge area of the second polymer layer 440 can have one stitch line 50 (as shown in Figure 8 ) or two stitch lines 50 (as shown in Figure 9 , one stitch line is arranged in each curved section 402 to release the stress of the second polymer in the arc area). According to some other embodiments of the present application, referring to Figure 10 and Figure 11 , the edge area of the second polymer layer 440 can have two stitch lines, both of which have overlapping areas with the same curved section 402, that is, both of which are arranged in the same curved area of the second polymer layer 440. According to some other embodiments of the present application, referring to Figure 7 , the edge area of the second polymer layer 440 can have four stitch lines, wherein the second polymer layer has two curved areas, and each curved area is respectively provided with two stitch lines (the first stitch line 50-1 and the second stitch line 50-2) for releasing the stress of each curved area of the second polymer layer. According to some other embodiments of the present application, three or more stitch lines can also be arranged in the arc area of the second polymer layer corresponding to each curved section for releasing stress.

[0057] According to some embodiments of the present application, referring to Figure 6 , Figure 7 , Figure 10 and Figure 11 , the edge area of the second polymer layer 440 has a first stitch line 50-1, the first stitch line 50-1 has an overlapping area with the boundary line 1 (referring to Figure 10 and Figure 11 ) of the planar section 401 and the curved section 402, and the first stitch line 50-1 is parallel to the boundary line 1. In this specification, "parallel" means approximately parallel. Due to the process precision problem, it is difficult to make two line segments or two planes absolutely parallel, therefore, the first stitch line 50-1 can be approximately parallel to the boundary line 1. The first stitch line is arranged at the boundary position of the planar section and the curved section, which can release the bending stress of the relatively thick second polymer layer in the arc area to a certain extent, and the film print of the small stitch line opening can be absorbed by the second adhesive layer, which will not be transmitted to the surface of the ultra-clean foam composite layer, so as not to form a film print.

[0058] According to some embodiments of the present application, referring to Figure 6 ,Figure 7 、 Figure 10 and Figure 11 , the edge region of the second polymer layer 440 has a second whip stitch line 50-2, the second whip stitch line 50-2 is parallel to the boundary line 1 of the planar part 401 and the curved part 402, the curved part 402 has a midline 5 (as shown in Figure 10 and Figure 11 ) away from the surface of the cover plate 100, wherein the midline 5 is a line connecting the midpoints of two oppositely arranged edges on the surface of the curved part 402 away from the cover plate 100, the midline 5 is parallel to the boundary line 1 of the planar part 401 and the curved part 402, and the second whip stitch line 50-2 has an overlapping region with the midline 5. It should be noted that the two oppositely arranged edges (referred to as the first edge line 3 and the second edge line 4 respectively) are both arc lines, and the midpoint of the arc line corresponds to the position of half the arc length of the arc line. The second whip stitch line 50-2 has an overlapping region with the midline 5, and the second whip stitch line 50-2 is parallel to the boundary line 1, which is beneficial to release the stress of the relatively thick second polymer layer in the arc-shaped region, thereby further improving the protection effect of the protective film layer. The small opening of the whip stitch line will be absorbed by the second adhesive layer and will not be transmitted to the surface of the ultra-clean foam composite layer, thereby avoiding the formation of film marks.

[0059] According to some embodiments of the present application, referring to Figure 10 and Figure 11 , the curved part 402 has a first edge line 2 and second and third edge lines 3 and 4 parallel to each other away from the surface of the cover plate 100, the first edge line 2 is perpendicular to the second edge line 3, the first edge line 2 is parallel to the boundary line 1 of the planar part 401 and the curved part 402, the edge region of the second polymer layer 440 has a second whip stitch line 50-2, the second whip stitch line 50-2 is parallel to the first edge line 2, and the second whip stitch line 50-2 has an overlapping region with a line (midline 5) connecting the midpoint A of the second edge line and the midpoint B of the third edge line. In this embodiment, referring to Figure 10 and Figure 11 , the curved part 402 itself has two arc surfaces parallel to each other, the edge lines corresponding to the two arc surfaces are parallel to each other, and the line connecting the midpoints of the two edge lines can be used as the midline 5, and the second whip stitch line 50-2 can be arranged along the midline 5.

[0060] The specific number of the first whip stitch line 50-1 and / or the second whip stitch line 50-2 can be set and adjusted according to the number of arc-shaped regions of the cover plate 100, for example, Figure 6 and Figure 7In some embodiments, both of the edge regions of the cover plate 100 are arc-shaped regions, and a first welt stitch 50-1 and a second welt stitch 50-2 can be arranged on the portions of the protective film layer corresponding to the two arc-shaped regions, respectively. When only one of the edge regions of the cover plate 100 is arc-shaped, only one first welt stitch 50-1 and one second welt stitch 50-2 can be arranged. When the number of arc-shaped regions of the cover plate 100 is other than two, the number of first welt stitches and the number of second welt stitches can be adjusted accordingly.

[0061] According to some embodiments of the present application, with reference to Figures 8 to 10 and Figure 12 , the hollow part 51 of the welt stitch 50 can be a long strip-shaped hollow part with smooth edges, i.e., two sides of the rectangle are replaced by a circular arc. According to other embodiments of the present application, with reference to Figure 11 and Figure 13 , the hollow part 51 of the welt stitch 50 can be a circular hollow part. In this way, the hollow part is less likely to cause material residues during production, and is also less likely to cause film printing when the protective film layer is later laminated with the ultra-clean foam composite layer.

[0062] According to some embodiments of the present application, with reference to Figure 12 , the length L1 of the long strip-shaped hollow part can be 0.5mm-1.5mm, for example, the length L1 of the long strip-shaped hollow part can be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, etc., and the width L2 of the long strip-shaped hollow part can be 0.1mm-0.2mm, for example, the width L2 of the long strip-shaped hollow part can be 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, etc. The length and width of the long strip-shaped hollow part are set in the above range, which is convenient for production, and is less likely to cause material residues and film printing, and can also effectively release the stress of the arc region of the second polymer layer.

[0063] According to some embodiments of the present application, with reference to Figure 12 , the spacing L3 between adjacent hollow parts 51 can be 0.5mm-1.5mm, for example, L3 can be 0.5mm, 0.7mm, 1mm, 1.3mm, 1.5mm, etc. The spacing is set in the above range, which is convenient for production, and the second polymer layer will not have a continuous broken region due to the arrangement of the welt stitch, and can still have a good protection effect.

[0064] According to some embodiments of the present application, with reference to Figure 13 , the diameter d1 of the circular hollow part can be 0.1mm-0.2mm, for example, d1 can be 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, etc. The size of the circular hollow part is set in the above range, the diameter is small, the second polymer layer still has a good supporting effect, and the arc region stress can also be effectively released.

[0065] According to some embodiments of the present application, the distance between adjacent hollow parts 51 can be equal to the length of the hollow part 51 (or the diameter of the hollow part 51).

[0066] According to some embodiments of the present application, referring to Figure 7 , the protective film layer 400 in the display module can also have a tear hand part 450, when it is necessary to tear the film, an action force can be applied through the tear hand part 450, and the protective film layer can be torn from the tear hand part 450. The specific number of the tear hand part 450 is not particularly limited in the present application, and one, two (as shown in Figure 7 ) or more can be provided.

[0067] In general, in the display module provided by the present application, the protective film layer includes two polymer layers, the first polymer layer can have a relatively thin thickness, so that the flatness of the protective film layer and the super-clean foam composite layer can be improved, and film layer peeling or interlayer gap is not easy to occur. The protective film layer can be attached to a plane, or to the surface of a super-clean foam composite layer having an arc region.

[0068] According to the embodiments of the present application, the display module described above can be used in mobile phones, iPads, notebooks and other display devices after the protective film layer is torn off.

[0069] In another aspect of the present application, a display device is provided. According to embodiments of the present application, the display device is a complete machine obtained by assembling the protective film layer of the display module described above.

[0070] Those skilled in the art can understand that, in addition to the super-clean foam composite layer, the display panel and the cover plate described above, the display device can also have the structures and components necessary for a conventional display device. Taking a mobile phone as an example, in addition to the super-clean foam composite layer, the display panel and the cover plate described above, the display device can also include a battery back cover, a middle frame, an audio module, a mainboard and other necessary structures and components.

[0071] The terms "first", "second", "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0072] In the description of the specification, the description of the terms "one embodiment", "another embodiment", "some embodiments", "some specific embodiments" or "other specific embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A display module, characterized by The display module comprises: a cover plate; a display panel located on one side of the cover plate; an ultra-clean foam composite layer located on the side of the display panel away from the cover plate; the ultra-clean foam composite layer comprises a third adhesive layer, a buffer layer and a heat dissipation layer arranged in sequence; a protective film layer located on the surface of the ultra-clean foam composite layer away from the display panel, in the direction of the display panel away from the cover plate, the protective film layer comprises a first adhesive layer, a first polymer layer, a second adhesive layer and a second polymer layer arranged in sequence; the thickness of the first polymer layer is denoted as H1, and the thickness of the second polymer layer is denoted as H2, H1 and H2 satisfy the following condition: H2≥1.5H1.

2. The display module of claim 1, wherein, At least one of the following conditions is satisfied: the material of the first polymer layer comprises polyethylene terephthalate; the material of the second polymer layer comprises polyethylene terephthalate; 20μm≤H1≤30μm; 45μm≤H2≤55μm.

3. The display module of claim 1, wherein, the thickness of the first adhesive layer is denoted as H3, and the thickness of the second adhesive layer is denoted as H4, the thickness of the first adhesive layer satisfies the following condition: 8μm≤H3≤10μm, and / or, the thickness of the second adhesive layer satisfies the following condition: 10μm≤H4≤15μm.

4. The display module of claim 1, wherein, the peeling force of the first adhesive layer is denoted as a, and the peeling force of the second adhesive layer is denoted as b, a and b satisfy the following condition: b≥24a.

5. The display module of claim 4, wherein, a and b satisfy the following condition: 15gf / inch≤a≤25gf / inch, b≥600gf / inch.

6. The display module of any one of claims 1-5, wherein, the cover plate is a curved cover plate; and / or, the display module further comprises an optically transparent adhesive layer located between the cover plate and the display panel.

7. The display module of claim 6, wherein, the protective film layer has a planar portion and at least one curved portion, the curved portion is located in the edge region of the protective film layer, the edge region of the second polymer layer has at least one welt line, the welt line comprises a plurality of spaced hollow portions, the welt line is parallel to the boundary line of the planar portion and the curved portion, and the welt line has an overlapping region with the curved portion.

8. The display module of claim 7, wherein, the edge region of the second polymer layer has a first welt line, the first welt line has an overlapping region with the boundary line of the planar portion and the curved portion, and the first welt line is parallel to the boundary line of the planar portion and the curved portion; and / or, the edge region of the second polymer layer has a second welt line, the second welt line is parallel to the boundary line of the planar portion and the curved portion, the surface of the curved portion away from the cover plate has a center line, the center line is the connecting line of the midpoints of the two oppositely arranged edges on the surface of the curved portion away from the cover plate, the center line is parallel to the boundary line of the planar portion and the curved portion, and the second welt line has an overlapping region with the center line. 9.The display module of any one of claims 1-5, 7 and 8, wherein, the protective film layer has a tear-off portion.

10. A display device, characterized by comprising: the display device is a complete machine obtained by assembling the protective film layer of the display module of any one of claims 1-9 after tearing off the protective film layer.

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