Display device

Abstract

This invention discloses a display device, comprising: a frame having a receiving groove; a display panel located within the receiving groove, the display panel including a display area and a non-display area adjacent to the display area, the display panel including an encapsulating adhesive located in the non-display area, and the display panel including a light-emitting surface and a backlight surface opposite to each other; a first adhesive layer disposed between the backlight surface of the display panel and the frame, the first adhesive layer and the encapsulating adhesive at least partially overlapping along the light-emitting direction of the display panel; and a second adhesive layer located at least partially between the first adhesive layer and the frame along the light-emitting direction of the display panel, the elastic modulus of the material of the second adhesive layer being greater than the elastic modulus of the material of the first adhesive layer. The first adhesive layer is easily deformable under stress, and stress is rapidly transmitted, allowing the first adhesive layer to release stress, avoiding stress concentration, improving the breakage rate in mechanical strength tests caused by stress concentration at the boundary of the encapsulating adhesive, increasing mechanical strength, and improving the reliability and performance of the display device.

Description

Technical Field

[0001] This invention belongs to the field of electronic product technology, and in particular relates to a display device. Background Technology

[0002] With the advancement of technology, digital display devices such as smartphones and tablets have been widely used, and the display screen is an indispensable human-to-human communication interface in these devices. OLED (Organic Light Emitting Diode) display devices, for example, have advantages such as self-illumination, energy saving, flexibility, and good adaptability. Furthermore, these display devices do not require a backlight and feature fast response times and excellent display effects, attracting user attention and being widely used in smartphones, tablets, and other terminal products.

[0003] However, due to the structural limitations of existing display devices, the reliability of display devices cannot meet the requirements.

[0004] Therefore, a new display device is urgently needed. Summary of the Invention

[0005] This invention provides a display device in which the elastic modulus of the material of the first adhesive layer is limited to be less than that of the material of the second adhesive layer. This allows the first adhesive layer to release stress, avoid stress concentration, improve the breakage rate in mechanical strength tests caused by stress concentration at the boundary of the encapsulating adhesive, and increase mechanical strength. Meanwhile, the second adhesive layer, with its high elastic modulus, has better rigidity. The second adhesive layer is at least partially located between the first adhesive layer and the frame to ensure the overall airtightness requirements of the display device, thereby improving the reliability and performance of the display device.

[0006] In a first aspect, embodiments of the present invention provide a display device, comprising: a frame having a receiving groove; a display panel located within the receiving groove, the display panel including a display area and a non-display area adjacent to the display area, the display panel including an encapsulating adhesive located in the non-display area, the display panel including a light-emitting surface and a backlight surface opposite to each other; a first adhesive layer disposed between the backlight surface of the display panel and the frame, the first adhesive layer and the encapsulating adhesive at least partially overlapping along the light-emitting direction of the display panel; and a second adhesive layer located at least partially between the first adhesive layer and the frame along the light-emitting direction of the display panel, the elastic modulus of the material of the second adhesive layer being greater than the elastic modulus of the material of the first adhesive layer.

[0007] Compared with related technologies, the display device provided in this embodiment of the invention includes a frame, a display panel, a first adhesive layer, and a second adhesive layer. The first adhesive layer is disposed between the backlight surface of the display panel and the frame, and the elastic modulus of the material of the first adhesive layer is less than that of the material of the second adhesive layer. The first adhesive layer is easily deformed under stress, and the stress is quickly transmitted, so that the first adhesive layer plays a role in releasing stress, avoiding stress concentration, improving the breakage rate of mechanical strength test caused by stress concentration at the boundary of the encapsulating adhesive, and improving mechanical strength. The second adhesive layer with a high elastic modulus has better rigidity. The second adhesive layer is at least partially located between the first adhesive layer and the frame to ensure the overall airtightness requirements of the display device, thereby improving the reliability and performance of the display device. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of a display device according to an embodiment of the present invention;

[0010] Figure 2 This is provided by one embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0011] Figure 3 This is provided by another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0012] Figure 4 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0013] Figure 5 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0014] Figure 6 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0015] Figure 7 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0016] Figure 8 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA;

[0017] Figure 9 This is a schematic diagram of the structure of the first adhesive layer according to an embodiment of the present invention;

[0018] Figure 10 This is a schematic diagram of the structure of the first adhesive layer provided according to another embodiment of the present invention. Detailed Implementation

[0019] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0021] To better understand this invention, the following is combined with... Figures 1 to 10 The display device according to embodiments of the present invention will be described in detail.

[0022] Through research and experiments conducted by the inventors, it was discovered that in existing display devices, due to the limitation of the bezel width, the inner edge of the encapsulating adhesive coincides with the inner edge of the adhesive layer located between the display panel and the frame. The inner side of the encapsulating adhesive is a stress concentration point, and the display panel is prone to damage under stress at the corresponding location.

[0023] To address the aforementioned issues, the display device provided in this embodiment of the invention limits the elastic modulus of the material of the first adhesive layer to be less than that of the material of the second adhesive layer. The first adhesive layer is easily deformed under stress, and stress is transmitted rapidly, so that the first adhesive layer can play a role in releasing stress, avoiding stress concentration, and improving mechanical strength. Meanwhile, the second adhesive layer with a high elastic modulus has better rigidity. The second adhesive layer is at least partially located between the first adhesive layer and the frame to ensure the overall airtightness requirements of the display device and improve the performance of the display device.

[0024] Please refer to the following: Figures 1 to 2 , Figure 1 This is a schematic diagram of the structure of a display device according to an embodiment of the present invention; Figure 2 This is provided by one embodiment of the present invention. Figure 1 A cross-sectional view at point AA.

[0025] Power 1

[0026] This invention provides a display device, comprising: a frame 1 having a receiving groove; a display panel 2 located within the receiving groove, the display panel 2 including a display area AA and a non-display area NA adjacent to the display area AA, the display panel 2 including an encapsulating adhesive 21 located in the non-display area NA, the display panel 2 including a light-emitting surface and a backlight surface opposite to each other; a first adhesive layer 3 disposed between the backlight surface of the display panel 2 and the frame 1, along the light-emitting direction Y of the display panel 2, the first adhesive layer 3 and the encapsulating adhesive 21 at least partially overlapping; and a second adhesive layer 4 along the light-emitting direction Y of the display panel 2, the second adhesive layer 4 at least partially located between the first adhesive layer 3 and the frame 1, the elastic modulus of the material of the second adhesive layer 4 being greater than the elastic modulus of the material of the first adhesive layer 3.

[0027] The display device provided in this embodiment of the invention includes a frame 1, a display panel 2, a first adhesive layer 3, and a second adhesive layer 4. The first adhesive layer 3 is disposed between the backlight surface of the display panel 2 and the frame 1. The elastic modulus of the material of the first adhesive layer 3 is less than that of the material of the second adhesive layer 4. The first adhesive layer 3 is easily deformed under stress, and the stress is quickly transmitted, so that the first adhesive layer 3 plays a role in releasing stress, avoiding stress concentration, improving the mechanical strength test breakage rate caused by stress concentration at the boundary of the encapsulating adhesive 21, and improving mechanical strength. The second adhesive layer 4, with its high elastic modulus, has better rigidity. The second adhesive layer 4 is at least partially located between the first adhesive layer 3 and the frame 1 to ensure the overall airtightness requirements of the display device, thereby improving the reliability and performance of the display device.

[0028] In this embodiment, the frame 1 is used to accommodate and fix the display panel 2. Optionally, the frame 1 includes a base plate 11 and a side plate 12 connected to the base plate 11. The base plate 11 and the side plate 12 form a receiving groove.

[0029] The frame 1 can be a one-piece structure for ease of molding and higher structural strength. For example, the frame 1 can be integrally molded using die casting, where the base plate 11 and side plates 12 are connected as a whole. Alternatively, the frame 1 can be manufactured using processes such as stamping. Of course, the frame 1 can also be a split structure, where the base plate 11 and side plates 12 can be manufactured separately.

[0030] Display panel 2 can be an organic light-emitting diode (OLED) display panel 2, a quantum dot light-emitting diode (QLED) display panel 2, or a micro flat panel display panel 2 (Micro-OLED or Micro-LED), etc.

[0031] Optionally, the encapsulating adhesive 21 can be Frit (glass adhesive). The material of the first adhesive layer 3 includes a one-component epoxy resin; and / or, the material of the second adhesive layer 4 includes a one-component epoxy resin. That is, the first adhesive layer 3 and the second adhesive layer 4 can be prepared using the same material, but the elastic modulus of the material of the second adhesive layer 4 needs to be made greater than that of the material of the first adhesive layer 3 by controlling factors such as the process. Alternatively, the first adhesive layer 3 and the second adhesive layer 4 can also be prepared using different materials, as long as the bonding performance and elastic modulus requirements are guaranteed.

[0032] It should be noted that in this embodiment, the first adhesive layer 3 and the encapsulating adhesive 21 at least partially overlap along the light emission direction Y of the display panel 2. This means that the first adhesive layer 3 is at least partially located below the encapsulating adhesive 21, so as to absorb and release the stress of the display panel 2 corresponding to the encapsulating adhesive 21, that is, to provide a stress release channel, reduce the stress on the weak position (inner side of the encapsulating adhesive 21), and improve the overall strength.

[0033] Optionally, both the first adhesive layer 3 and the second adhesive layer 4 can be formed by staged injection molding, for example, by using LIPO (Low Injection Pressure Overmolding) process. The entire process of low-pressure injection molding (low pressure + adhesive + injection + demolding) is as follows: a special adhesive is filled into the melt tank of the injection molding equipment at a relatively low temperature (many materials for screens cannot withstand high temperatures) and melted. After melting, the liquid has very good fluidity and only requires a small pressure to flow into a small mold space. After the adhesive cools and solidifies, it can be demolded and formed.

[0034] In some optional embodiments, the ratio between the elastic modulus of the material of the second adhesive layer 4 and the elastic modulus of the material of the first adhesive layer 3 is greater than or equal to 2:1. For example, the ratio between the elastic modulus of the material of the second adhesive layer 4 and the elastic modulus of the material of the first adhesive layer 3 can be equal to 2:1, 3:1, 4:1, etc., to ensure that the stress absorption effect of the first adhesive layer 3 and the rigidity of the second adhesive layer 4 meet the requirements.

[0035] Optionally, the elastic modulus of the material of the first adhesive layer 3 is greater than or equal to 0.3 GPa and less than or equal to 3 GPa; and / or, the elastic modulus of the material of the second adhesive layer 4 is greater than or equal to 0.6 GPa and less than or equal to 6 GPa.

[0036] For example, when the elastic modulus of the material of the first adhesive layer 3 is equal to 0.3 GPa, the elastic modulus of the material of the second adhesive layer 4 can be equal to 0.6 GPa, or greater than 0.6 GPa, such as 1 GPa, 2 GPa, 3 GPa, etc. Or, when the elastic modulus of the material of the first adhesive layer 3 is equal to 3 GPa, the elastic modulus of the material of the second adhesive layer 4 can be equal to 6 GPa.

[0037] In some optional embodiments, the second adhesive layer 4 includes a first portion 41 and a second portion 42 connected together; the first portion 41 is disposed between the first adhesive layer 3 and the frame 1, and the second portion 42 is disposed on one side of the display panel 2 and the first adhesive layer 3 along the first direction X and is connected to the frame 1, wherein the first direction X intersects with the light emission direction Y of the display panel 2.

[0038] It should be noted that the first part 41 is located between the first adhesive layer 3 and the frame 1, and is made of a high elastic modulus material to ensure the rigidity of the adhesive, provide good flatness, and ensure the sealing performance of the fit with the bottom plate 11 of the frame 1. The second part 42 is located on one side of the display panel 2 and the first adhesive layer 3 along the first direction X, that is, the second part 42 is set on the side of the display panel 2 to achieve sealing and encapsulation of the side of the display panel 2.

[0039] Optionally, the first adhesive layer 3 and the first portion 41 are both located between the display panel 2 and the base plate 11, and the second portion 42 is located on one side of the display panel 2 and the first adhesive layer 3 along the first direction X, and is in contact with the side plate 12. The first adhesive layer 3 is positioned closer to the display panel 2 than the first portion 41. The first portion 41 can directly contact the base plate 11, while the second portion 42 can be in contact with the side of the display panel 2 and the first adhesive layer 3 along the first direction X.

[0040] Please see Figure 2 In some optional embodiments, the first adhesive layer 3 extends a predetermined distance along the first direction X toward the second portion 42 so that a portion of the first adhesive layer 3 is embedded in the second portion 42.

[0041] It should be noted that in this embodiment, by restricting the first adhesive layer 3 from extending along the first direction X to the second part 42, the stress borne by the first adhesive layer 3 is transferred to the second part 42, and the stress concentration point is transferred to the direction where the second part 42 is located, thereby reducing the stress on the weak position (inner side of the encapsulating adhesive 21) and improving the overall strength.

[0042] Optionally, along the first direction X, the first adhesive layer 3 includes a first edge B1 near the frame 1, and the first direction X intersects with the light emission direction Y of the display panel 2; the display panel 2 includes an array layer 42, and the encapsulating adhesive 21 is located on the side of the array layer 42 away from the first adhesive layer 3, and the array layer 42 includes a second edge B2 near the frame 1; along the light emission direction Y of the display panel 2, the first edge B1 and the second edge B2 at least partially overlap.

[0043] In this embodiment, the first adhesive layer 3 extends along the first direction X toward the second portion 42. The first edge B1 of the extended portion can be flush with the second edge B2 of the array layer 42, so that the first adhesive layer 3 can withstand and release stress from the corresponding position of the array layer 42, and avoid the array layer 42 from being damaged due to stress concentration.

[0044] Please see Figure 2 Optionally, along the light emission direction Y of the display panel 2, the orthographic projection of the first edge B1 on the substrate and the orthographic projection of the second edge B2 on the substrate coincide, that is, the first edge B1 can be flush with the second edge B2 of the array layer 42.

[0045] Optionally, the array layer 42 may include a driving circuit. For example, the array layer 42 may include a first conductive layer, a second conductive layer, and a third conductive layer disposed on one side of the substrate and stacked thereon. An insulating layer is disposed between adjacent conductive film layers. Exemplarily, the pixel driving circuit disposed on the array layer 42 includes a transistor and a storage capacitor. The transistor includes an active layer, a gate, a source, and a drain. The storage capacitor includes a first electrode and a second electrode. As an example, the gate and the first electrode may be located on the first conductive layer, the second electrode may be located on the second conductive layer, and the source and drain may be located on the third conductive layer.

[0046] Optionally, the display panel 2 may also include a light-emitting functional layer 23 disposed on the side of the array layer 42 away from the encapsulating adhesive 21. Optionally, the light-emitting functional layer 23 may include a first electrode layer, a light-emitting layer and a second electrode layer stacked in a direction away from the array layer 42.

[0047] Optionally, the light-emitting layer includes one or more of the following: an electron injection layer, an electron transport layer, a light-emitting material layer, a hole blocking layer, an electron blocking layer, a hole transport layer, and a hole injection layer. The specific selection depends on the type of light-emitting layer and is not particularly limited. The electron injection layer, electron transport layer, and hole blocking layer can be disposed between the second electrode layer and the light-emitting material layer. The electron blocking layer, hole transport layer, and hole injection layer can be disposed between the first electrode layer and the light-emitting material layer.

[0048] The material of the first electrode layer is generally a material with a high work function to improve hole injection efficiency. It can be gold (Au), platinum (Pt), titanium (Ti), silver (Ag), indium tin oxide (ITO), zinc tin oxide (IZO), or a transparent conductive polymer (such as polyaniline). For example, the first electrode layer can be made of an ITO-Ag-ITO composite material, without any particular limitation.

[0049] The material of the second electrode layer can be one of the following metals: silver (Ag), aluminum (Al), lithium (Li), magnesium (Mg), ytterbium (Yb), calcium (Ca), or indium (In). It can also be an alloy of the aforementioned metals, such as magnesium-silver alloy (Mg / Ag) or lithium-aluminum alloy (Li / Al). This embodiment does not limit the material in this regard.

[0050] Please see Figure 2 In some optional embodiments, along the first direction X, the encapsulating adhesive 21 includes a third edge B3 away from the frame 1, the first adhesive layer 3 includes a fourth edge B4 away from the frame 1, and the second adhesive layer 4 includes a fifth edge B5 away from the frame 1. Along the first direction X, the first direction X intersects with the light emission direction Y of the display panel 2; along the light emission direction Y of the display panel 2, the third edge B3, the fourth edge B4, and the fifth edge B5 at least partially overlap.

[0051] It should be noted that the overlap of the third edge B3, the fourth edge B4, and the fifth edge B5 along the light emission direction Y of the display panel 2 means that the orthographic projections of the third edge B3, the fourth edge B4, and the fifth edge B5 on the substrate at least partially coincide along the light emission direction Y of the display panel 2, so as to define the positional dimensions of the first adhesive layer 3 and the second adhesive layer 4 along the first direction X, thereby achieving the requirement of a narrow bezel.

[0052] Optionally, along the light emission direction Y of the display panel 2, the orthographic projections of the third edge B3, the fourth edge B4, and the fifth edge B5 on the substrate completely overlap.

[0053] Please see Figures 3 to 6 , Figure 3 This is provided by another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA; Figure 4 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA; Figure 5 This is provided by yet another embodiment of the present invention. Figure 1A cross-sectional view at point AA. In some optional embodiments, the cross-sectional area of ​​the first adhesive layer 3 decreases along the direction from the display area AA to the non-display area NA. This decreasing trend means that the cross-sectional area of ​​the first adhesive layer 3 can decrease uniformly or in a stepped manner. Specifically, the thickness of the first adhesive layer 3 can be limited to decrease along the direction from the display area AA to the non-display area NA. That is, the cross-sectional shape of the first adhesive layer 3 can be trapezoidal or a stepped shape formed by a combination of multiple rectangles along the direction from the display area AA to the non-display area NA.

[0054] In this embodiment, the cross-sectional area of ​​the first adhesive layer 3 decreases along the direction from the display area AA to the non-display area NA. That is, along the direction from the display area AA to the non-display area NA, the first adhesive layer 3 adopts a "wide in the front and narrow in the back" structure, and the stress concentration point is shifted to the narrow side position, which improves the stress relief effect at the weak position and enhances the overall strength.

[0055] Please see Figure 3 Optionally, along the light-emitting direction Y of the display panel 2, the first adhesive layer 3 includes a first surface F1 and a second surface F2 opposite to each other, the first surface F1 being disposed away from the display panel 2 relative to the second surface F2; the first surface F1 being disposed at an angle relative to the second surface F2.

[0056] It is understood that in this embodiment, along the light emission direction Y of the display panel 2, the cross-sectional shape of the first adhesive layer 3 can be trapezoidal, with the first surface F1 and the second surface F2 corresponding to the two sides of the trapezoid, and the length of the side of the trapezoid away from the frame 1 is greater than the length of the side of the trapezoid facing the frame 1, so that the cross-sectional area of ​​the first adhesive layer 3 decreases along the direction from the display area AA to the non-display area NA. If the tilt angle of the first surface F1 relative to the second surface F2 is too large or too small, it will not be able to transfer the stress concentration point of the first adhesive layer 3 to the narrow side position. Optionally, the tilt angle of the first surface F1 relative to the second surface F2 can be 30° to 60°.

[0057] Please see Figures 4 to 6 In some optional embodiments, along the light emission direction Y of the display panel 2, the first adhesive layer 3 includes a first surface F1 and a second surface F2 opposite to each other, the first surface F1 being disposed away from the display panel 2 relative to the second surface F2; the first surface F1 is a stepped surface.

[0058] It should be noted that the first surface F1 is a stepped surface, which means that the first surface F1 can have an ascending trend along the direction from the non-display area NA to the display area AA. Specifically, it can be a rectangular stepped surface or a trapezoidal stepped surface. Correspondingly, along the direction from the display area AA to the non-display area NA, the cross-sectional area of ​​the first adhesive layer 3 can have a progressively decreasing trend. On the same stepped surface, the cross-sectional area of ​​the first adhesive layer 3 at each position can be equal, while the cross-sectional area of ​​the first adhesive layer 3 corresponding to different stepped surfaces is different. Specifically, along the direction from the display area AA to the non-display area NA, the cross-sectional area of ​​the first adhesive layer 3 corresponding to each stepped surface is gradually reduced.

[0059] Optionally, the second surface F2 can be a plane or a stepped surface, without any special limitation.

[0060] Please see Figure 5 In some optional embodiments, along the first direction X, the first adhesive layer 3 includes at least two connected sub-parts 31, and the first direction X intersects the light emission direction Y of the display panel 2; along the first direction X, the lengths of two adjacent sub-parts 31 are equal.

[0061] It is understandable that when the first surface F1 is a stepped surface, each corresponding sub-part 31 can form a different stepped surface. That is, along the light emission direction Y of the display panel 2, the thickness of each sub-part 31 is at least partially different. Optionally, along the direction from the display area AA to the non-display area NA, the thickness of each sub-part 31 gradually decreases.

[0062] In this embodiment, along the first direction X, the lengths of two adjacent sub-parts 31 are equal, so that the thickness of the first adhesive layer 3 varies uniformly along the direction from the display area AA to the non-display area NA, which is convenient for preparation and ensures that the first adhesive layer 3 is subjected to uniform stress, avoiding the problem of stress concentration.

[0063] Please see Figure 4 In some alternative embodiments, the length of each sub-part 31 gradually increases along the direction from the display area AA to the non-display area NA. That is, the closer to the frame 1, the longer the sub-part 31 is along the first direction X, so as to progressively reduce stress and shift the stress concentration point of the first adhesive layer 3 to the sub-part 31 closer to the frame 1, so that the stress relief effect at the weak position is better and the overall strength is improved.

[0064] Or, such as Figure 6 As shown, some sub-parts 31 can also have equal lengths along the first direction X, while others can have unequal lengths along the first direction X.

[0065] Optionally, along the direction from the display area AA to the non-display area NA, the length of the one closer to the frame 1 in two adjacent sub-parts 31 is greater than or equal to twice the length of the other.

[0066] Please see Figure 5 In some optional embodiments, along the first direction X, the first adhesive layer 3 includes at least three connected sub-sections 31, the first direction X intersects the light emission direction Y of the display panel 2; the difference in thickness d between any two adjacent sub-sections 31 is equal.

[0067] It is understandable that the thickness of the sub-part 31 along the light emission direction Y of the display panel 2 will affect the stress release effect at the corresponding position of the first adhesive layer 3. The greater the thickness, the better the corresponding release effect. The difference between the thicknesses of any two adjacent sub-parts 31 is equal, so that the stress release effect of each sub-part 31 changes evenly, avoiding sudden changes that cause excessive stress on the first adhesive layer 3 at a certain point, and ensuring that the overall stress release effect of the first adhesive layer 3 meets the requirements.

[0068] It should be noted that the number of sub-parts 31 in the first adhesive layer 3 is not particularly limited, and needs to be selected according to the size of the display panel 2 and the size of the first adhesive layer 3. For example, the first adhesive layer 3 may include three, four, five or more connected sub-parts 31.

[0069] Please see Figures 7 to 8 , Figure 7 This is provided by yet another embodiment of the present invention. Figure 1 Schematic diagram of the cross section at point AA; Figure 8 This is provided by yet another embodiment of the present invention. Figure 1 A cross-sectional view at point AA; In some optional embodiments, along the light emission direction Y of the display panel 2, the first adhesive layer 3 includes a first surface F1 and a second surface F2 opposite to each other, the first surface F1 being disposed away from the display panel 2 relative to the second surface F2; the first surface F1 is provided with a protrusion T that protrudes toward the second adhesive layer 4, and the protrusion T is embedded in the second adhesive layer 4.

[0070] It is understandable that by providing a protrusion T embedded in the second adhesive layer 4 on the first surface F1, the bonding force between the first adhesive layer 3 and the second adhesive layer 4 can be increased, thereby preventing the first adhesive layer 3 and the second adhesive layer 4 from delaminating and improving reliability. The distance at which the protrusion T is embedded in the second adhesive layer 4 should not be too large. If it is too large, it may penetrate the second adhesive layer 4 and affect the sealing performance. If it is too small, the protrusion T may have limited effect and cannot effectively increase the bonding force between the first adhesive layer 3 and the second adhesive layer 4. The specific choice can be made according to the actual situation.

[0071] Please see Figure 9 , Figure 9This is a schematic diagram of the structure of the first adhesive layer 3 provided according to an embodiment of the present invention; in some optional embodiments, the first surface F1 includes a first region Q1 and a second region Q2. Along the first direction X, the first region Q1 is disposed away from the frame 1 relative to the second region Q2. The first direction X intersects with the light emission direction Y of the display panel 2. The distribution density of the protrusions T in the first region Q1 is greater than or equal to the distribution density of the protrusions T in the second region Q2.

[0072] It is understandable that the more protrusions T are provided, the larger the contact area between the protrusions T and the second adhesive layer 4 in the corresponding area, the stronger the bonding force between the protrusions T and the second adhesive layer 4, the less likely they are to separate, and the better the stress release effect. In this embodiment, the first region Q1 is located away from the frame 1 relative to the second region Q2, that is, the first region Q1 is closer to the inner edge of the encapsulating adhesive 21 than the second region Q2. This can limit the distribution density of protrusions T in the first region Q1 to be greater than the distribution density of protrusions T in the second region Q2, thereby enhancing the stress absorption and release capability of the first region Q1 on the display panel 2 corresponding to the encapsulating adhesive 21, reducing the stress on the inner side of the encapsulating adhesive 21, and improving the overall strength.

[0073] Of course, the distribution density of the protrusions T in the first region Q1 can also be equal to the distribution density of the protrusions T in the second region Q2, so as to achieve uniform setting of the protrusions T and ensure the consistency of the connection effect of the first adhesive layer 3 and the second adhesive layer 4.

[0074] It should be noted that, in order to make the distribution density of the protrusions T in the first region Q1 greater than or equal to the distribution density of the protrusions T in the second region Q2, the distance between adjacent protrusions T can be adjusted by making the number of protrusions T in the first region Q1 greater than or equal to the number of protrusions T in the second region Q2, thereby adjusting the distribution density of the protrusions T. Alternatively, the shape and size of the protrusions T in the first region Q1 and the second region Q2 can also be adjusted. For example, the orthographic projection area of ​​the protrusions T in the first region Q1 and the second region Q2 on the frame 1 along the light emission direction Y of the display panel 2 can be adjusted to adjust the distribution density of the protrusions T accordingly.

[0075] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of the first adhesive layer 3 according to another embodiment of the present invention. Optionally, along the light emission direction Y of the display panel 2, the orthogonal projection area of ​​the protrusion T in the first region Q1 on the frame 1 is greater than the orthogonal projection area of ​​the protrusion T in the second region Q2 on the frame 1.

[0076] It is understandable that the larger the orthographic projection area of ​​the protrusion T in the first region Q1 on the frame 1, the larger the contact area between the part of the protrusion T embedded in the second adhesive layer 4 and the second adhesive layer 4. By increasing the orthographic projection area of ​​the protrusion T in the first region Q1 on the frame 1, the distance between adjacent protrusions T can be reduced, thereby increasing the distribution density of protrusions T in the first region Q1.

[0077] Please see Figure 8 In some optional embodiments, along the light emission direction Y of the display panel 2, the protrusion height of the protrusion T in the first region Q1 is greater than or equal to the protrusion height of the protrusion T in the second region Q2.

[0078] It is understandable that the higher the protrusion height of the protrusion T, the greater the bonding force between the corresponding protrusion T and the second adhesive layer 4, the less likely it is to separate, and the better the stress release effect. In this embodiment, the protrusion height of the protrusion T in the first region Q1 is limited to be greater than that in the second region Q2 along the light emission direction Y of the display panel 2, so as to enhance the stress absorption and release capability of the first region Q1 for the part of the display panel 2 corresponding to the encapsulating adhesive 21, reduce the stress on the inner side of the encapsulating adhesive 21, and improve the overall strength.

[0079] In some optional embodiments, along the light emission direction Y of the display panel 2, the cross-sectional shape of the protrusion T is at least one of polygon and semi-circle. For example, the cross-sectional shape of the protrusion T can be rectangular, triangular, semi-circular, trapezoidal, etc. Optionally, in order to facilitate the insertion of the protrusion T into the second adhesive layer 4, along the light emission direction Y of the display panel 2, the protrusion T can be gradually widened so that the tip of the protrusion T can enter the second adhesive layer 4.

[0080] Optionally, along the light emission direction Y of the display panel 2, the orthographic projection shape of the protrusion T on the frame 1 is at least one of a polygon or a circle. In combination with the cross-sectional shape of the protrusion T along the light emission direction Y of the display panel 2, the protrusion T as a whole can be a cylinder, cone, rectangular prism, hemisphere, etc. The specific shape can be selected according to actual needs and there are no special limitations.

[0081] Optionally, the display device further includes a composite adhesive layer 5, which is at least partially disposed between the display panel 2 and the first adhesive layer 3, with the first adhesive layer 3 and the composite adhesive layer 5 in contact. In this embodiment, the composite adhesive layer 5 is disposed between the display panel 2 and the first adhesive layer 3, serving as an adhesive and providing a certain buffering effect. Optionally, the composite adhesive layer 5 includes a first adhesive layer, a foam layer, and a second adhesive layer stacked together.

[0082] Optionally, the display device may also include film components such as an encapsulation layer 6, a polarizer 7, an optical adhesive 8, and a cover plate 9 disposed on the light-emitting side of the display panel 2.

[0083] Optical Adhesive 8 can specifically be OCA (Optically Clear Adhesive). OCA adhesive uses optical acrylic adhesive as a base material, and then a release film is laminated on the top and bottom layers to obtain a double-sided adhesive tape without a substrate. OCA adhesive layers have uniform thickness, high flatness, high adhesion, and strong bonding strength after lamination. Of course, other adhesive materials can also be used for optical adhesive 8, such as double-sided tape.

[0084] Understandably, the cover plate 9 is a film layer made of materials such as glass with high light transmittance, which serves to protect the display panel 2. Specifically, the cover plate 9 can be made of rigid materials, which has a relatively low cost; or it can be made of flexible materials, so that the cover plate 9 can be folded, thus making it applicable to flexible and foldable display modules. Specifically, the cover plate 9 can be made of transparent, soft, and foldable materials such as UTG (Ultra Thin Glass), CPI (Colorless Polyimide), and PET (Polyethylene Terephthalate), so as to realize that the cover plate 9 can be bent and folded, making it easy to be used in foldable display panels 2.

[0085] Understandably, the encapsulation layer 6 is used to encapsulate and protect the display panel 2.

[0086] Optionally, the encapsulation layer 6 includes a first encapsulation layer. The material of the first encapsulation layer includes inorganic materials, such as silicon nitride, silicon oxide, and silicon oxynitride. Specifically, it can be formed using a CVD (Chemical Vapor Deposition) process.

[0087] Optionally, the encapsulation layer 6 also includes a second encapsulation layer located on the side of the first encapsulation layer opposite to the display panel 2. The material of the second encapsulation layer includes an organic material. The organic material can be made of resin or polymer organic material, and can be formed using IJP (Inkjet printing) process.

[0088] Optionally, the encapsulation layer 6 may also include a third encapsulation layer located on the side of the second encapsulation layer opposite to the display panel 2. The material of the third encapsulation layer includes inorganic materials. Adding an inorganic encapsulation layer outside the organic encapsulation layer can further improve the encapsulation effect of the encapsulation layer 6. In this embodiment, the material of the third encapsulation layer may be the same as or different from the material of the first encapsulation layer, and there is no special limitation.

[0089] Optionally, the materials of the first encapsulation layer and the third encapsulation layer are the same, so that the first encapsulation layer and the third encapsulation layer can be prepared using the same equipment, which can simplify the manufacturing process of the display device.

[0090] The display device provided in this embodiment of the invention can be applied to mobile phones or any electronic product with display function, including but not limited to the following categories: televisions, laptops, desktop monitors, tablets, digital cameras, smart bracelets, smart glasses, in-vehicle displays, medical devices, industrial control equipment, touch interactive terminals, etc. This embodiment of the invention does not impose any special limitations on these.

[0091] The above are merely specific embodiments of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

[0092] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

Claims

1. A display device, characterized in that, include: The frame has a receiving slot; A display panel is located within the receiving groove. The display panel includes a display area and a non-display area adjacent to the display area. The display panel includes encapsulating adhesive located in the non-display area. The display panel includes a light-emitting surface and a backlight surface facing each other. A first adhesive layer is disposed between the backlight surface of the display panel and the frame, along the light emission direction of the display panel, and the first adhesive layer and the encapsulating adhesive at least partially overlap. The second adhesive layer is located along the light emission direction of the display panel. The second adhesive layer is at least partially located between the first adhesive layer and the frame. The elastic modulus of the material of the second adhesive layer is greater than that of the material of the first adhesive layer. The second adhesive layer includes a first part and a second part connected to each other. The first part is located between the first adhesive layer and the frame. The second part is located on one side of the display panel and the first adhesive layer along a first direction and is in contact with the frame. The first direction intersects the light emission direction of the display panel.

2. The display device according to claim 1, characterized in that, The ratio between the elastic modulus of the material of the second adhesive layer and the elastic modulus of the material of the first adhesive layer is greater than or equal to 2:

1.

3. The display device according to claim 1, characterized in that, The elastic modulus of the material of the first adhesive layer is greater than or equal to 0.3 GPa and less than or equal to 3 GPa; and / or, The elastic modulus of the material of the second adhesive layer is greater than or equal to 0.6 GPa and less than or equal to 6 GPa.

4. The display device according to claim 1, characterized in that, The material of the first adhesive layer includes a one-component epoxy resin adhesive; and / or, The material of the second adhesive layer includes a one-component epoxy resin adhesive.

5. The display device according to claim 1, characterized in that, The frame includes a base plate and side plates connected to the base plate, the base plate and the side plates forming the receiving groove; The first adhesive layer and the first portion are both located between the display panel and the base plate, and the second portion is located on one side of the display panel and the first adhesive layer along the first direction and is in contact with the side plate.

6. The display device according to claim 1, characterized in that, The first adhesive layer extends a predetermined distance toward the second portion along the first direction, so that a portion of the first adhesive layer is embedded in the second portion.

7. The display device according to claim 1, characterized in that, Along a first direction, the first adhesive layer includes a first edge near the frame, and the first direction intersects with the light emission direction of the display panel; The display panel includes an array layer, the encapsulating adhesive is located on the side of the array layer opposite to the first adhesive layer, and the array layer includes a second edge near the frame; Along the light emission direction of the display panel, the first edge and the second edge at least partially overlap.

8. The display device according to claim 1, characterized in that, Along the first direction, the encapsulating adhesive includes a third edge away from the frame, the first adhesive layer includes a fourth edge away from the frame, and the second adhesive layer includes a fifth edge away from the frame. Along the first direction, the first direction intersects the light emission direction of the display panel. Along the light emission direction of the display panel, the third edge, the fourth edge, and the fifth edge at least partially overlap.

9. The display device according to claim 1, characterized in that, Along the direction from the display area to the non-display area, the cross-sectional area of ​​the first adhesive layer decreases.

10. The display device according to claim 9, characterized in that, Along the light emission direction of the display panel, the first adhesive layer includes a first surface and a second surface opposite to each other, with the first surface disposed away from the display panel relative to the second surface; The first surface is inclined relative to the second surface.

11. The display device according to claim 9, characterized in that, Along the light emission direction of the display panel, the first adhesive layer includes a first surface and a second surface opposite to each other, with the first surface disposed away from the display panel relative to the second surface; The first surface is a stepped surface.

12. The display device according to claim 9, characterized in that, Along a first direction, the first adhesive layer includes at least two connected sub-parts, and the first direction intersects with the light emission direction of the display panel; Along the first direction, the lengths of two adjacent sub-sections are equal, or, along the direction from the display area to the non-display area, the lengths of each sub-section gradually increase.

13. The display device according to claim 9, characterized in that, Along a first direction, the first adhesive layer includes at least three connected sub-parts, and the first direction intersects with the light emission direction of the display panel; The difference in thickness between any two adjacent sub-parts is equal.

14. The display device according to claim 1, characterized in that, Along the light emission direction of the display panel, the first adhesive layer includes a first surface and a second surface opposite to each other, with the first surface disposed away from the display panel relative to the second surface; The first surface has a protrusion that protrudes toward the second adhesive layer, and the protrusion is embedded in the second adhesive layer.

15. The display device according to claim 14, characterized in that, The first surface includes a first region and a second region. Along a first direction, the first region is disposed away from the frame relative to the second region. The first direction intersects with the light emission direction of the display panel. The distribution density of the protrusions in the first region is greater than or equal to the distribution density of the protrusions in the second region.

16. The display device according to claim 15, characterized in that, Along the light emission direction of the display panel, the protrusion height of the protrusion in the first region is greater than or equal to the protrusion height of the protrusion in the second region.

17. The display device according to claim 15, characterized in that, Along the light emission direction of the display panel, the projected area of ​​the protrusion in the first region on the frame is greater than the projected area of ​​the protrusion in the second region on the frame.

18. The display device according to claim 14, characterized in that, Along the light emission direction of the display panel, the cross-sectional shape of the protrusion is at least one of a polygon or a semicircle.

19. The display device according to claim 14, characterized in that, Along the light emission direction of the display panel, the orthographic projection shape of the protrusion on the frame is at least one of a polygon or a circle.

20. The display device according to claim 1, characterized in that, It also includes a composite adhesive layer, which is at least partially disposed between the display panel and the first adhesive layer, and the first adhesive layer and the composite adhesive layer are in contact.

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