Display module and display device

Abstract

The application discloses a display module and a display device. The display module comprises a display panel and a composite functional layer, and the display panel comprises a display part, a binding part and a bending part. The binding part is arranged on one side of the display part. One end of the bending part is connected to the display part, and the other end is bent towards the side of the display part close to the binding part and connected to the binding part. The composite functional layer comprises a buffer sublayer attached to the side of the display part close to the binding part, and a support sublayer attached to the side of the buffer sublayer away from the display part. The binding part is attached to the side of the support sublayer away from the buffer sublayer. The material of the buffer sublayer comprises a polyurethane rubber material containing silicon. The application can reduce the distance between the binding part and the display part, the bending radius of the bending part, and the frame width of the side of the display module corresponding to the bending part, so as to realize a narrow frame display module.

Description

TECHNICAL FIELD

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

[0002] In the modern communication industry, the market demand for products such as mobile phones, televisions, tablets, notebooks and digital cameras is increasing, and various display devices are also developing towards larger size and bendability. Pad-bending technology is one of the key technologies to realize narrow frame of flexible organic light-emitting diode (OLED) display panel. The technology is to fold the bending area of the terminal area of the display panel to the back of the display panel at a certain angle and radius to realize narrow frame.

[0003] The existing display panel can reduce the width of the lower frame to a certain extent even through bending binding, but at the lower frame of the display panel, a certain space is still needed to accommodate the part of the display panel for bending, so that the width of the lower frame of the display panel cannot be further reduced. SUMMARY

[0004] The embodiments of the present application provide a display module and a display device, which can reduce the frame width of the display module and improve the screen ratio of the display module.

[0005] The embodiments of the present application provide a display module, which comprises a display panel and a composite functional layer, and the display panel comprises:

[0006] a display part;

[0007] a binding part arranged on one side of the display part;

[0008] a bending part, one end of which is connected to the display part, and the other end is bent towards the side of the display part close to the binding part and connected to the binding part;

[0009] The composite functional layer comprises a buffer sublayer attached to the side of the display part close to the binding part, and a support sublayer attached to the side of the buffer sublayer away from the display part, and the binding part is attached to the side of the support sublayer away from the buffer sublayer, and the material of the buffer sublayer comprises a polyurethane rubber material containing silicon.

[0010] In an embodiment of the present application, the distance between the binding part and the display part in the thickness direction of the composite functional layer is less than 260 microns.

[0011] In an embodiment of the present application, the distance between the binding portion and the display portion along the thickness direction of the composite functional layer is greater than or equal to 128 microns and less than or equal to 248 microns.

[0012] In an embodiment of the present application, the thickness of the buffer sub-layer is greater than or equal to 40 microns and less than or equal to 150 microns, and the elastic modulus of the buffer sub-layer is greater than or equal to 50 kPa and less than or equal to 500 kPa.

[0013] In an embodiment of the present application, the elastic modulus of the support sub-layer is greater than or equal to 50 GPa and less than or equal to 250 GPa.

[0014] In an embodiment of the present application, the thickness of the support sub-layer is greater than or equal to 30 microns and less than or equal to 150 microns.

[0015] In an embodiment of the present application, the composite functional layer further comprises a first adhesive layer arranged between the buffer sub-layer and the display portion, and a second adhesive layer arranged between the buffer sub-layer and the support sub-layer.

[0016] In an embodiment of the present application, the thickness of the first adhesive layer is greater than or equal to 13 microns and less than or equal to 50 microns, and the thickness of the second adhesive layer is greater than or equal to 35 microns and less than or equal to 50 microns.

[0017] In an embodiment of the present application, at least one of the first adhesive layer and the second adhesive layer comprises a black adhesive material, and at least one of the first adhesive layer and the second adhesive layer is doped with carbon powder particles.

[0018] In an embodiment of the present application, the support sub-layer comprises a first sub-portion and a second sub-portion arranged on the side of the first sub-portion close to the bending portion, and the thickness of the second sub-portion is less than the thickness of the first sub-portion, and the distance from the surface of the second sub-portion away from the display portion to the display portion is less than the distance from the surface of the first sub-portion away from the display portion to the display portion.

[0019] In an embodiment of the present application, the binding portion is attached to the side of the second sub-portion away from the display portion.

[0020] In an embodiment of the present application, the composite functional layer comprises a third adhesive layer arranged between the binding portion and the support sub-layer, and the binding portion is attached to the side of the second sub-portion away from the display portion through the third adhesive layer.

[0021] In an embodiment of the present application, the thickness of the third adhesive layer is greater than or equal to the difference between the thickness of the first sub-portion and the thickness of the second sub-portion.

[0022] In an embodiment of the present application, the third adhesive layer has a thickness greater than or equal to 50 microns and less than or equal to 100 microns.

[0023] In an embodiment of the present application, the third adhesive layer comprises a first adhesive layer disposed between the binding portion and the support sub-layer, and a second adhesive layer attached to the bending portion on a side close to the composite functional layer, the second adhesive layer being connected to the first adhesive layer.

[0024] In an embodiment of the present application, at least one of the buffer sub-layer and the third adhesive layer is doped with carbon powder particles.

[0025] In an embodiment of the present application, in a direction along the second sub-portion pointing to the first sub-portion, the distance from the binding portion to the first sub-portion is greater than or equal to 0 and less than or equal to 300 microns.

[0026] According to the above-mentioned purposes of the present application, the embodiments of the present application further provide a display device, characterized in that the display device comprises the display module.

[0027] The present application has the following beneficial effects: The present application uses a polyurethane rubber material containing silicon to prepare a buffer sub-layer, so that the buffer sub-layer has certain support performance, better buffering performance, and anti-static performance, thereby replacing the buffer layer in the back plate and the heat dissipation composite material in the related art, effectively reducing the number of film layers in the display module, i.e., the thickness of the buffer sub-layer can be reduced relative to the sum of the thicknesses of the buffer layer in the back plate and the heat dissipation composite material, thereby reducing the distance between the binding portion and the display portion, reducing the bending radius of the bending portion, and further reducing the frame width on the side corresponding to the bending portion of the display module, thereby realizing a narrow-frame display module. BRIEF DESCRIPTION OF DRAWINGS

[0028] The technical solutions and other beneficial effects of the present application will become apparent through the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

[0029] Figure 1 FIG. 1 is a structural schematic diagram of a display module in the related art;

[0030] Figure 2 FIG. 2 is a structural schematic diagram of a display module according to an embodiment of the present application;

[0031] Figure 3 FIG. 3 is a structural schematic diagram of a buffer sub-layer, a first adhesive layer, and a second adhesive layer according to an embodiment of the present application;

[0032] Figure 4 FIG. 4 is a structural schematic diagram of a display panel, a buffer sub-layer, a first adhesive layer, and a second adhesive layer according to an embodiment of the present application;

[0033] Figure 5 A structure diagram of a support sub-layer provided by an embodiment of the present application is shown in the following figure;

[0034] Figure 6 A structure diagram of a display panel and a laminated structure of a composite functional layer provided by an embodiment of the present application is shown in the following figure;

[0035] Figure 7 Another structure diagram of a display module provided by an embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without any creative work fall within the protection scope of the present application.

[0037] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but a person skilled in the art can realize the application of other processes and / or the use of other materials.

[0038] Please refer to Figure 1In related technologies, the bottom bezel of the display module needs to be bent to reduce the bezel width. The back side of the panel body 1 is provided with a back plate 2 and a heat dissipation composite material 3. The binding section 6 of the panel body 1 needs to be bent through the bending section 7 to the side of the heat dissipation composite material 3 away from the back plate 2 to achieve bending binding. Two back plates 4 and an adhesive layer 5 are provided between the binding section 6 and the panel body 1 so that the binding section 6 can be attached to the heat dissipation composite material 3. Specifically, the backplate 2 generally includes a layered adhesive layer and a substrate layer, while the heat dissipation composite material 3 generally includes a layered heat dissipation layer, a heat dissipation layer, a mechanical property reinforcement layer, a buffer layer, and a light-shielding adhesive layer. Its film structure has many layers, resulting in a large thickness. Specifically, the thickness of the backplate 2 is generally 90-150 micrometers, the thickness of the heat dissipation composite material 3 is generally 260-350 micrometers, and the thickness of the adhesive layer 5 is generally 50-300 micrometers. Adding the thickness of the two backplates 4, the distance between the panel body 1 and the bonding section 6 is generally 490-950 micrometers. Consequently, the bending radius of the bending section 7 needs to be adapted to the distance between the panel body 1 and the bonding section 6, resulting in a large bending radius of the bending section 7. This limits the further reduction of the bottom bezel width of the display module, making it difficult to achieve a display module with a narrower bezel.

[0039] This invention provides a display module, please refer to... Figure 2 The display module includes a display panel 10 and a composite functional layer 20.

[0040] The display panel 10 includes a display part 11, a binding part 12, and a bending part 13. The binding part 12 is disposed on one side of the display part 11, and one end of the bending part 13 is connected to the display part 11, and the other end is bent toward the side of the display part 11 near the binding part 12 and connected to the binding part 12.

[0041] The composite functional layer 20 includes a buffer sub-layer 21 attached to the side of the display section 11 near the bonding section 12, and a support sub-layer 22 attached to the side of the buffer sub-layer 21 away from the display section 11. The bonding section 12 is attached to the side of the support sub-layer 22 away from the buffer sub-layer 21. The material of the buffer sub-layer 21 includes a polyurethane rubber material containing silicone.

[0042] In the implementation process, the application embodiment adopts the polyurethane rubber material containing silicon to prepare the buffer sub-layer 21, and the polyurethane rubber material containing silicon has higher density than the polyurethane rubber material, so that the buffer sub-layer 21 has certain supporting performance, better buffering performance and anti-static performance, thereby replacing the buffer layer in the back plate and the heat dissipation composite material in the related art, that is, the buffer sub-layer 21 in the application embodiment can reduce the number of film layers in the display module while ensuring good performance, thereby reducing the thickness, and effectively reducing the distance between the binding part 12 and the display part 11, thereby reducing the bending radius of the bending part 13, and further reducing the frame width of the display module corresponding to the bending part 13, thereby realizing the narrow frame display module.

[0043] Specifically, in one embodiment of the application, referring to Figure 2 The display module provided by the application embodiment comprises a display panel 10, a composite functional layer 20, a polarizing plate 31, a transparent adhesive layer 32 and a cover plate 33.

[0044] The display panel 10 comprises a display part 11, a binding part 12 and a bending part 13, the display part 11 is used for displaying a picture, the binding part 12 is located on the side of the display part 11 away from the display surface, one end of the bending part 13 is connected to the display part 11, and the other end is bent towards the side away from the display part 11 and connected to the binding part 12, so that the end of the display panel 10 close to the binding part 12 is bent to the back side of the display part 11 and used for binding the driving assembly.

[0045] The composite functional layer 20 is arranged between the display part 11 and the binding part 12 to support the display part 11 and the binding part 12, the polarizing plate 31 is arranged on the side of the display part 11 away from the binding part 12, the transparent adhesive layer 32 is arranged on the side of the polarizing plate 31 away from the display part 11, and the cover plate 33 is attached to the side of the polarizing plate 31 away from the display part 11 through the transparent adhesive layer 32; in addition, the display module further comprises a light shielding piece 34 arranged between the transparent adhesive layer 32 and the cover plate 33, and the light shielding piece 34 can be a light shielding adhesive tape or ink, so as to shield the frame part of the display module which does not display.

[0046] Further, the display module further comprises a driving chip 41 and a flexible circuit board 42 which are bound to the binding portion 12, and the display panel 10 further comprises a wiring portion 14 which is arranged on the bending portion 13, and the wiring portion 14 can transmit signals on the driving chip 41 and the flexible circuit board 42 to the display portion 11 to realize the display function of the display portion 11; wherein the wiring portion 14 can be arranged in a pattern, for example, an opening is arranged on the wiring in the wiring portion 14, so as to reduce the bending stress of the wiring portion 14 and improve the yield of the display panel 10; similarly, the base of the bending portion 13 can also be arranged in a pattern to further reduce the bending stress of the bending portion 13 in the bending process.

[0047] The display module further comprises a protective adhesive layer 43 which is arranged on the side of the bending portion 13 away from the composite functional layer 20 to cover the wiring portion 14 and the surface of the bending portion 13 away from the composite functional layer 20, and the material of the protective adhesive layer 43 can comprise UV adhesive material.

[0048] In the embodiment of the present application, the composite functional layer 20 comprises a buffer sublayer 21 which is attached to the side of the display portion 11 close to the binding portion 12, and a support sublayer 22 which is attached to the side of the buffer sublayer 21 away from the display portion 11.

[0049] Further, the composite functional layer 20 comprises a first adhesive layer 23, a second adhesive layer 24 and a third adhesive layer 25, wherein the buffer sublayer 21 is attached to the surface of the display portion 11 close to the binding portion 12 through the first adhesive layer 23, the support sublayer 22 is attached to the surface of the buffer sublayer 21 away from the display portion 11 through the second adhesive layer 24, and the binding portion 12 is attached to the surface of the support sublayer 22 away from the buffer sublayer 21 through the third adhesive layer 25.

[0050] The material of the buffer sublayer 21 comprises a polyurethane rubber material containing silicon, wherein the polyurethane rubber material containing silicon has higher density and more excellent buffering performance than conventional polyurethane rubber materials, and also has an antistatic effect. Furthermore, the buffer sublayer 21 in the embodiment of the present application has more good performances, and can replace the buffer layer in the back plate and the heat dissipation composite material in the related art to reduce the number of film layers in the display module and reduce the thickness of the composite functional layer 20.

[0051] It should be noted that, in the embodiment of the present application, the buffer sublayer 21 and the support sublayer 22 are both single-layer film layer structures, and thus the purpose of replacing a large number of film layers in the related art with a small number of film layers can be achieved to reduce the distance between the display portion 11 and the binding portion 12.

[0052] Optionally, the materials of the first glue layer 23, the second glue layer 24 and the third glue layer 25 can be silicon or acrylic glue materials, and the first glue layer 23 and / or the second glue layer 24 can be black glue materials to improve the light shielding effect of the composite functional layer 20. Meanwhile, at least one of the buffer sub-layer 21, the first glue layer 23, the second glue layer 24 and the third glue layer 25 is doped with carbon powder particles. That is, in the embodiment of the present application, the buffer sub-layer 21, the first glue layer 23, the second glue layer 24 and the third glue layer 25 can all be doped with carbon powder particles, thereby improving the heat dissipation performance of the buffer sub-layer 21, the first glue layer 23, the second glue layer 24 and the third glue layer 25. The composite functional layer 20 provided by the embodiment of the present application has good buffering capacity, anti-static capacity, light shielding capacity and heat dissipation capacity at the same time, so that the composite functional layer 20 has the above excellent properties, thereby replacing the back plate, the heat dissipation layer, the heat uniformization layer, the buffer layer and the light shielding adhesive layer in the related art, effectively reducing the number of functional film layers of the display module, so that the thickness of the composite functional layer 20 provided by the embodiment of the present application can be less than the sum of the thicknesses of the back plate and the heat dissipation composite material in the related art, so that the distance between the binding part 12 and the display part 11 is closer, that is, the distance between the binding part 12 and the display part 11 in the thickness direction of the composite functional layer 20 is smaller, so as to reduce the bending radius of the bending part 13, that is, to reduce the occupied space of the bending part 13, thereby reducing the frame width of the display module and realizing a narrow frame display module.

[0053] It can be understood that in the embodiment of the present application, while the distance between the binding part 12 and the display part 11 is reduced, the length of the binding part 12 and the bending part 13 also needs to be reduced compared with the related art, so that the bending radius of the bending part 13 can be effectively reduced.

[0054] Optionally, the elastic modulus of the buffer sub-layer 21 is greater than or equal to 50 kPa and less than or equal to 500 kPa, and the transmittance is greater than or equal to 88%.

[0055] In addition, the material of the support sub-layer 22 can include stainless steel, carbon fiber or aluminum alloy, and the elastic modulus of the above-mentioned materials is large, thereby playing a good supporting role. The material of the mechanical performance reinforcing layer in the related art is generally polyimide, and the supporting role of the support sub-layer 22 in the embodiment of the present application is better than that of the mechanical performance reinforcing layer in the related art. Therefore, while ensuring the same or better supporting role, the thickness of the support sub-layer 22 can be made thinner to further reduce the distance between the display part 11 and the binding part 12, further reduce the bending radius of the bending part 13 and reduce the frame width of the display module. Meanwhile, the support sub-layer 22 can be prepared by using a metal material, and the metal material also has good heat dissipation performance, thereby further improving the heat dissipation capacity of the composite functional layer 20.

[0056] Optionally, the elastic modulus of the support sub-layer 22 can be greater than or equal to 50 GPa and less than or equal to 250 GPa.

[0057] Please refer to Figure 2 The support sub-layer 22 comprises a first sub-portion 221 and a second sub-portion 222 connected together, wherein the thickness of the second sub-portion 222 is less than the thickness of the first sub-portion 221, the distance from the surface of the second sub-portion 222 away from the display portion 11 to the display portion 11 is less than the distance from the surface of the first sub-portion 221 away from the display portion 11 to the display portion 11, and the surface of the second sub-portion 222 close to the display portion 11 is flush with the surface of the first sub-portion 221 close to the display portion 11. The binding portion 12 is attached to the surface of the second sub-portion 222 away from the display portion 11 through the third adhesive layer 25, so as to further reduce the distance between the display portion 11 and the binding portion 12, further reduce the bending radius of the bending portion 13, and reduce the frame width of the display module.

[0058] It should be noted that, in the related art, as shown in Figure 1 , the binding segment 6 needs to be supported by the two-segment back plate 4 before being bent to the back side of the panel main body 1 for attachment, and then the two-segment back plate 4 and the adhesive layer 5 are clamped between the binding segment 6 and the heat dissipation composite material 3 after the attachment; in the embodiment of the present application, please continue to refer to Figure 2 , the PET protective film is attached to the side of the third adhesive layer 25 away from the binding portion 12 before the binding portion 12 is bent to the back side of the display portion 11 for attachment, which can support the binding portion 12 and protect the attachment surface of the third adhesive layer 25, and then the PET protective film is removed when the binding portion 12 is attached to the support sub-layer 22, so that the binding portion 12 is attached to the support sub-layer 22, and compared with the related art, the embodiment of the present application can reduce the setting of the two-segment back plate 4, further reduce the distance between the binding portion 12 and the display portion 11, reduce the bending radius of the bending portion 13, i.e. reduce the occupied space of the bending portion 13, and then the frame width of the display module can be reduced, and the narrow frame display module is realized.

[0059] In the embodiment of the present application, the distance between the binding part 12 and the display part 11 along the thickness direction of the composite functional layer 20 is less than 260 microns, which is much smaller than the distance between the panel body and the binding segment in the related art, i.e. 490-950 microns; further, in the embodiment of the present application, the buffer sublayer 21 has certain supporting performance, as well as good buffer performance and anti-static performance; and the carbon powder particles can be doped in one of the first glue layer 23, the second glue layer 24, the third glue layer 25 and the buffer sublayer 21, so that the composite functional layer 20 has good heat dissipation performance; and the first glue layer 23 and the second glue layer 24 can be black glue materials, so that the composite functional layer 20 also has light shielding performance; the supporting sublayer 22 can be supported by metal materials or carbon fibers, and has excellent supporting performance; that is, the composite functional layer 20 in the embodiment of the present application has the above excellent performances, so as to replace the back plate and the heat dissipation composite material in the related art, reduce the number of film layers in the display module, reduce the distance between the binding part 12 and the display part 11, so as to reduce the bending radius of the bending part 13, and further achieve the purpose of reducing the frame width of the display module.

[0060] Further preferably, the distance between the binding part 12 and the display part 11 along the thickness direction of the composite functional layer 20 is greater than or equal to 128 microns and less than or equal to 248 microns.

[0061] Specifically, the thickness of the buffer sub-layer 21 is greater than or equal to 40 microns and less than or equal to 150 microns, so that the composite functional layer 20 has sufficient buffering capacity and anti-static capacity; when the thickness of the support sub-layer 22 is too small, it is easy to produce marks and other adverse phenomena, and when the thickness of the support sub-layer 22 is too large, it is easy to peel off at the curved edge when the display panel is applied to a curved edge screen, the thickness of the support sub-layer 22 is greater than or equal to 30 microns and less than or equal to 150 microns, so that the composite functional layer 20 has good supporting capacity while the thickness is not too large; the thickness of the first adhesive layer 23 is greater than or equal to 13 microns and less than or equal to 50 microns, the thickness of the second adhesive layer 24 is greater than or equal to 35 microns and less than or equal to 50 microns, and the thickness of the third adhesive layer 25 is greater than or equal to 50 microns and less than or equal to 100 microns, so that each adhesive layer has sufficient adhesion capacity while reducing the thickness of the composite functional layer 20, and carbon powder particles can be doped in the buffer sub-layer 21, the first adhesive layer 23, the second adhesive layer 24 and the third adhesive layer 25 to improve the heat dissipation capacity of the composite functional layer 20, then the first adhesive layer 23, the second adhesive layer 24 and the third adhesive layer 25 in the embodiment of the application can realize other functions such as light shielding and heat dissipation on the basis of adhering the film layers in the composite functional layer 20, and further, the composite functional layer 20 in the embodiment of the application can replace part of the functional film layers in the heat dissipation composite material 3 in the related art on the basis of only arranging three adhesive layers, that is, the embodiment of the application can not only reduce the number of adhesive layers, but also reduce the number of other functional film layers, so as to further reduce the thickness of the composite functional layer 20.

[0062] Further, the embodiment of the application selects the thickness of each film layer in the composite functional layer 20 of the display panel and verifies its performance, specifically including:

[0063] Embodiment one, the first adhesive layer 23, the buffer sub-layer 21, the second adhesive layer 24 and the support sub-layer 22 can be formed in sequence on the back side of the sample panel; wherein the thickness of the first adhesive layer 23 is 35 microns, the thickness of the buffer sub-layer 21 is 50 microns, the thickness of the second adhesive layer 24 is 35 microns, and the thickness of the support sub-layer 22 is 70 microns, so that the total thickness of the first adhesive layer 23, the buffer sub-layer 21, the second adhesive layer 24 and the support sub-layer 22 is 190 microns.

[0064] Embodiment two, the first adhesive layer 23, the buffer sub-layer 21, the second adhesive layer 24 and the support sub-layer 22 can be formed in sequence on the back side of the sample panel; wherein the thickness of the first adhesive layer 23 is 35 microns, the thickness of the buffer sub-layer 21 is 50 microns, the thickness of the second adhesive layer 24 is 35 microns, and the thickness of the support sub-layer 22 is 100 microns, so that the total thickness of the first adhesive layer 23, the buffer sub-layer 21, the second adhesive layer 24 and the support sub-layer 22 is 220 microns.

[0065] In the comparative example, the back plate 2 and the heat dissipation composite material 3 can be sequentially formed on the back side of the sample panel, wherein the thickness of the back plate is 88 microns, the heat dissipation composite material comprises an opaque adhesive layer, a buffer layer and a copper layer, the copper layer can play a supporting and heat dissipation role; wherein the thickness of the opaque adhesive layer is 40 microns, the thickness of the buffer layer is 126 microns, and the thickness of the copper layer is 65 microns, and the total thickness of the back plate 2 and the heat dissipation composite material 3 is 319 microns.

[0066] It should be noted that the sample panels in the first example, the second example and the comparative example are all the same panel.

[0067] Specifically, the first example, the second example and the comparative example are subjected to indentation test, back side extrusion test and back side ball drop test to test the buffering performance and supporting performance of the composite functional layer 20 provided by the embodiment of the present application.

[0068] In the indentation test, the flat area of the display surface is marked in a dark room under strong light, and then a pressure head is pressed from the back side of the sample panel, specifically a 2.5*8mm stainless steel rectangular flat head is used, 4mm / min (i.e. 4mm per minute), pressure maintaining for 5s, the initial pressure is 11N, and each time it is increased by 1N until a large angle appearance indentation occurs, to obtain Table 1 as follows:

[0069] Table 1 Indentation test result table

[0070]

[0071] In the back side extrusion test, the sample panel is first lit, and then a ball head is pressed from the back side of the sample panel, a φ10mm stainless steel ball head is used, 4mm / min (i.e. 4mm per minute), pressure maintaining for 5s, the initial pressure is 160N, and each time it is increased by 20N until a bright spot / dark spot appears, to obtain Table 2 as follows:

[0072] Table 2 Back side extrusion test result table

[0073]

[0074] In the back side ball drop test, the sample panel is first lit, and a steel ball is controlled to fall from the back side of the sample panel, a φ14mm stainless steel ball head is used, the weight is 11.2g, 20 points (20 point positions are dropped) are dropped, starting from a height of 35mm, and each time it is increased by 5mm until a bright spot / dark spot appears, to obtain Table 3 as follows:

[0075] Table 3 Back side ball drop test result table

[0076]

[0077] From the above Table 1, Table 2 and Table 3, it can be seen that the composite functional layer 20 provided in the embodiments of the present application has better results than the back plate 2 and the heat dissipation composite material 3 in the imprint test, and the results thereof are equal to or slightly better than those of the back plate 2 and the heat dissipation composite material 3 in the back surface extrusion test, and the results thereof are also better than those of the back plate 2 and the heat dissipation composite material 3 in the back surface drop ball test. That is, the support performance and the buffering performance of the composite functional layer 20 provided in the embodiments of the present application are obviously better than those of the back plate 2 and the heat dissipation composite material 3, and the thickness of the composite functional layer 20 is much smaller than the sum of the thicknesses of the back plate 2 and the heat dissipation composite material 3. That is, the composite functional layer 20 in the embodiments of the present application can replace the back plate 2 and the heat dissipation composite material 3 in the related art, reduce the number of film layers in the display module, reduce the distance between the binding portion 12 and the display portion 11, reduce the bending radius of the bending portion 13, and thus achieve the purpose of reducing the frame width of the display module.

[0078] Further, the thickness of the third adhesive layer 25 is greater than or equal to the difference between the thickness of the first sub-portion 221 and the thickness of the second sub-portion 222, that is, the distance from the surface of the binding portion 12 away from the display portion 11 to the display portion 11 is greater than or equal to the distance from the surface of the first sub-portion 221 away from the display portion 11 to the display portion 11. This can prevent the flexible circuit board 42 from being lifted by the first sub-portion 221 when the binding portion 12 is attached to the second sub-portion 222, and thus the flexible circuit board 42 is in a position with high unevenness, and the phenomenon of disconnection of the flexible circuit board 42 can be reduced.

[0079] In the direction from the second sub-portion 222 to the first sub-portion 221, the distance from the binding portion 12 to the first sub-portion 221 is greater than or equal to 0 and less than or equal to 300 microns. That is, the boundary of the binding portion 12 cannot exceed the boundary of the second sub-portion 222 and the first sub-portion 221, so as to avoid the phenomenon of poor bonding such as warping of the binding portion 12 and the third adhesive layer 25 at the boundary of the second sub-portion 222 and the first sub-portion 221.

[0080] Preferably, the end of the third adhesive layer 25 close to the bending portion 13, the end of the second sub-portion 222 close to the bending portion 13, the end of the second adhesive layer 24 close to the bending portion 13, the end of the buffering sub-layer 21 close to the bending portion 13, and the end of the first adhesive layer 23 close to the bending portion 13 are all flush.

[0081] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6In the assembling process of the composite functional layer 20 and the display panel 10, the buffer sub-layer 21 is provided first, and the buffer sub-layer 21 is provided with glue on both sides, i.e., the buffer sub-layer 21 is provided with the first glue layer 23 and the second glue layer 24 on both sides respectively.

[0082] Then, the buffer sub-layer 21 is attached to the position of the display panel 10 corresponding to the display part 11 through the first glue layer 23; the support sub-layer 22 is attached to the side of the buffer sub-layer 21 away from the display part 11 through the second glue layer 24; in addition, the third glue layer 25 is arranged on the side of the binding part 12 close to the buffer sub-layer 21.

[0083] Next, the bending part 13 can be bent towards the side of the display part 11 close to the support sub-layer 22, so that the binding part 12 is attached to the side of the second sub-part 222 away from the display part 11 through the third glue layer 25.

[0084] It should be noted that the driving chip 41 and the flexible circuit board 42 (not shown in the figure) can be bound on the side of the binding part 12 away from the third glue layer 25 in advance.

[0085] As described above, the buffer sub-layer 21 is prepared by using the polyurethane rubber material containing silicon, and the support sub-layer 22 is prepared by using the material with a large elastic modulus such as stainless steel, carbon fiber or aluminum alloy, so that the buffer sub-layer 21 has good buffering performance, anti-static performance and heat dissipation performance, and the support sub-layer 22 has good supporting performance; compared with the heat dissipation composite material and the back plate in the related art, the buffer sub-layer 21 and the support sub-layer 22 in the embodiment of the present application can be thinned while ensuring good performance, so that the distance between the binding part 12 and the display part 11 along the thickness direction of the composite functional layer 20 is less than 260 microns, which is much smaller than 490-950 microns in the related art, thereby effectively reducing the distance between the binding part 12 and the display part 11, reducing the bending radius of the bending part 13, and further reducing the frame width on the side of the display module corresponding to the bending part 13, so as to realize the narrow frame display module.

[0086] Please refer to Figure 7 In another embodiment of the present application, the difference between the present embodiment and the previous embodiment is that the third glue layer 25 is not only arranged between the binding part 12 and the support sub-layer 22, but also can be arranged on the side of the bending part 13 close to the composite functional layer 20.

[0087] The third adhesive layer 25 includes a first adhesive 251 arranged between the binding portion 12 and the supporting sub-layer 22, and a second adhesive 252 arranged on the side of the bending portion 13 close to the composite functional layer 20, and the first adhesive 251 is connected with the second adhesive 252. Further, the elastic modulus of at least the second adhesive 252 is smaller than the elastic modulus of the first adhesive layer 23 and smaller than the elastic modulus of the second adhesive layer 24. Since the second adhesive 252 needs to bend along with the bending portion 13, the bending performance of the second adhesive 252 can be improved by reducing the elastic modulus of the second adhesive 252. In addition, the elastic modulus of the first adhesive 251 and the second adhesive 252 can be smaller than the elastic modulus of the first adhesive layer 23 and smaller than the elastic modulus of the second adhesive layer 24.

[0088] It should be noted that the thickness of the third adhesive layer 25 can be reduced in the embodiment of the present application to further improve the bending performance of the second adhesive 252, but the distance from the surface of the side of the binding portion 12 away from the display portion 11 to the display portion 11 needs to be greater than the distance from the surface of the side of the first sub-portion 221 away from the display portion 11 to the display portion 11.

[0089] As described above, the polyurethane rubber material containing silicon is used to prepare the buffer sub-layer 21, and the material with large elastic modulus such as stainless steel, carbon fiber or aluminum alloy is used to prepare the supporting sub-layer 22, so that the buffer sub-layer 21 has good buffer performance, anti-static performance and heat dissipation performance, and the supporting sub-layer 22 has good supporting performance. Compared with the heat dissipation composite material and the back plate in the related art, the buffer sub-layer 21 and the supporting sub-layer 22 in the embodiment of the present application can be thinned while ensuring good performance, so that the distance between the binding portion 12 and the display portion 11 along the thickness direction of the composite functional layer 20 is less than 260 microns, which is much smaller than 490-950 microns in the related art. Thus, the distance between the binding portion 12 and the display portion 11 is effectively reduced, the bending radius of the bending portion 13 is reduced, and the frame width of the display module corresponding to the side of the bending portion 13 is reduced, so that a narrow frame display module is realized. In the embodiment of the present application, the third adhesive layer 25 can extend to the side of the bending portion 13 close to the composite functional layer 20, so that the third adhesive layer 25 does not need to be cut with high precision in the previous embodiment, and the process procedure is simplified.

[0090] In addition, the embodiment of the present application further provides a display device, which includes a device main body and the display module described in the above embodiment, and the device main body and the display module are combined as a whole.

[0091] The device main body can include a frame, a power supply and other devices, and the display device can be a television, a mobile phone, a tablet computer and a display device of a computer.

[0092] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0093] The display module and the display device provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the technical solutions of the present application and the core ideas thereof. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display module, characterized by The display module comprises a display panel and a composite functional layer, and the display panel comprises: a display part; a binding part arranged on one side of the display part; a bending part having one end connected to the display part and the other end bent towards the side of the display part close to the binding part and connected to the binding part; wherein the composite functional layer comprises a buffer sub-layer attached to the side of the display part close to the binding part and a support sub-layer attached to the side of the buffer sub-layer away from the display part, and the binding part is attached to the side of the support sub-layer away from the buffer sub-layer, and the material of the buffer sub-layer comprises a polyurethane rubber material containing silicon. The support sub-layer comprises a first sub-part and a second sub-part arranged on the side of the first sub-part close to the bending part, and the thickness of the second sub-part is smaller than that of the first sub-part, and the distance from the surface of the side of the second sub-part away from the display part to the display part is smaller than the distance from the surface of the side of the first sub-part away from the display part to the display part; wherein the binding part is attached to the side of the second sub-part away from the display part.

2. The display module of claim 1, wherein, The distance between the binding part and the display part in the thickness direction of the composite functional layer is less than 260 microns.

3. The display module of claim 1, wherein, The distance between the binding part and the display part in the thickness direction of the composite functional layer is greater than or equal to 128 microns and less than or equal to 248 microns.

4. The display module of claim 1, wherein, The thickness of the buffer sub-layer is greater than or equal to 40 microns and less than or equal to 150 microns, and the elastic modulus of the buffer sub-layer is greater than or equal to 50 kPa and less than or equal to 500 kPa.

5. The display module of claim 1, wherein, The elastic modulus of the support sub-layer is greater than or equal to 50 GPa and less than or equal to 250 GPa.

6. The display module of claim 1, wherein, The thickness of the support sub-layer is greater than or equal to 30 microns and less than or equal to 150 microns.

7. The display module of claim 1, wherein, The composite functional layer further comprises a first adhesive layer arranged between the buffer sub-layer and the display part, and a second adhesive layer arranged between the buffer sub-layer and the support sub-layer. The thickness of the first adhesive layer is greater than or equal to 13 microns and less than or equal to 50 microns, and the thickness of the second adhesive layer is greater than or equal to 35 microns and less than or equal to 50 microns.

8. The display module of claim 7, wherein, At least one of the first adhesive layer and the second adhesive layer comprises a black adhesive material, and at least one of the first adhesive layer and the second adhesive layer is doped with carbon powder particles.

9. The display module of claim 1, wherein, The composite functional layer comprises a third adhesive layer arranged between the binding part and the support sub-layer, and the binding part is attached to the side of the second sub-part away from the display part through the third adhesive layer. The thickness of the third adhesive layer is greater than or equal to the difference between the thickness of the first sub-part and the thickness of the second sub-part.

10. The display module of claim 9, wherein, The thickness of the third adhesive layer is greater than or equal to 50 microns and less than or equal to 100 microns.

11. The display module of claim 9, wherein, The third adhesive layer comprises a first adhesive arranged between the binding part and the support sub-layer, and a second adhesive attached to the side of the bending part close to the composite functional layer, and the second adhesive is connected to the first adhesive.

12. The display module of claim 9, wherein, At least one of the buffer sub-layer and the third adhesive layer is doped with carbon powder particles.

13. The display module of claim 1, wherein, In a direction along the second sub-portion pointing to the first sub-portion, a distance from the binding portion to the first sub-portion is greater than or equal to 0 and less than or equal to 300 microns.

14. A display device comprising: The display device comprises the display module as claimed in any one of claims 1 to 13.

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