Display device

Abstract

The invention discloses a display device, and the display device comprises a frame body which is provided with a containing groove; the display panel is located in the containing groove, the display panel comprises a display area and a non-display area adjacent to the display area, the display panel comprises packaging glue located in the non-display area, and the display panel comprises a light emitting face and a backlight face which are opposite to each other; the first adhesive layer is arranged between the backlight surface of the display panel and the frame body, and the first adhesive layer and the packaging adhesive are at least partially overlapped in the light emitting direction of the display panel; the second adhesive layer is located between the first adhesive layer and the frame body at least partially in the light emitting direction of the display panel, and the elastic modulus of the material of the second adhesive layer is larger than that of the material of the first adhesive layer. The first adhesive layer is easy to deform when being stressed, and the stress is quickly transmitted, so that the first adhesive layer plays a role in releasing the stress, the stress concentration is avoided, the mechanical strength test fragment rate caused by the stress concentration at the packaging adhesive boundary is improved, the mechanical strength is improved, and the reliability and the use performance of the display device are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic products, and in particular relates to a display device. Background Art

[0002] With the advancement of technology, digital display devices such as smart phones and tablet computers have been widely used, among which the display screen is an indispensable interpersonal communication interface in these display devices. OLED (Organic Light Emitting Diode) display devices have the advantages of self-luminescence, energy saving and consumption reduction, bendability, good flexibility, etc., and the display device that realizes display does not require a backlight source, has the characteristics of fast response speed and good display effect, and has attracted the attention of users and is widely used in terminal products such as smart phones and tablet computers.

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

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

[0005] An embodiment of the present invention provides a display device, which limits the elastic modulus of the material of the first adhesive layer to be smaller than the elastic modulus of the material of the second adhesive layer, so that the first adhesive layer plays a role in releasing stress, avoids stress concentration, improves the mechanical strength test breakage rate caused by stress concentration at the boundary of the packaging adhesive, and improves the mechanical strength. The second adhesive layer with a high elastic modulus has good rigidity, and 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, an embodiment of the present invention provides a display device, comprising: a frame having a receiving groove; a display panel located in the receiving groove, the display panel comprising a display area and a non-display area adjacent to the display area, the display panel comprising a packaging glue located in the non-display area, and the display panel comprising a light emitting surface and a backlight surface relative to each other; a first glue layer, disposed between the backlight surface of the display panel and the frame, the first glue layer and the packaging glue at least partially overlapping along the light emitting direction of the display panel; a second glue layer, along the light emitting direction of the display panel, the second glue layer at least partially located between the first glue layer and the frame, the elastic modulus of a material of the second glue layer being greater than the elastic modulus of a material of the first glue layer.

[0007] Compared with the related art, the display device provided by the embodiment of the present invention includes a frame, a display panel, a first glue layer and a second glue layer. The first glue layer is arranged between the backlight surface of the display panel and the frame, and the elastic modulus of the material of the first glue layer is smaller than the elastic modulus of the material of the second glue layer. The first glue layer is easily deformed when subjected to force, and the stress is quickly transmitted, so that the first glue layer 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 packaging glue, and improving the mechanical strength. The second glue layer with a high elastic modulus has good rigidity, and the second glue layer is at least partially located between the first glue layer and the frame to ensure the overall airtightness requirements of the display device, thereby improving the reliability and performance of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0010] Figure 2 An embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0011] Figure 3 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0012] Figure 4 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0013] Figure 5 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0014] Figure 6 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0015] Figure 7 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0016] Figure 8 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle;

[0017] Fig. 9 is a schematic structural diagram of a first adhesive layer provided according to an embodiment of the present invention;

[0018] Fig.10 is a schematic structural diagram of a first adhesive layer provided according to another embodiment of the present invention. DETAILED DESCRIPTION

[0019] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0020] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0021] In order to better understand the present invention, Figures 1 to 10 A display device according to an embodiment of the present invention is described in detail.

[0022] The inventors have discovered through experimental research that in existing display devices, due to the limitation of the frame width of the display device, the inner edge of the encapsulation glue coincides with the inner edge of the glue layer between the display panel and the frame. The inner side of the encapsulation glue is a stress concentration point, and the display panel is easily damaged by force at the corresponding position.

[0023] In order to solve the above problems, the display device provided by the embodiment of the present invention limits the elastic modulus of the material of the first adhesive layer to be smaller than the elastic modulus of the material of the second adhesive layer. The first adhesive layer is easily deformed when subjected to force and the stress is quickly transmitted, so that the first adhesive layer plays a role in releasing stress, avoiding stress concentration and improving mechanical strength. The second adhesive layer with a high elastic modulus has good rigidity, and 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 performance of the display device.

[0024] Please also read Figure 1 to Figure 2 , Figure 1 is a schematic structural diagram of a display device provided according to an embodiment of the present invention; Figure 2 An embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle.

[0025] Right 1

[0026] An embodiment of the present invention provides a display device, comprising: a frame 1 having a receiving groove; a display panel 2 located in 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 a packaging glue 21 located in the non-display area NA, and the display panel 2 including a light emitting surface and a backlight surface relative 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 packaging glue 21 at least partially overlap; a second adhesive layer 4, along the light emitting direction Y of the display panel 2, the second adhesive layer 4 is at least partially located between the first adhesive layer 3 and the frame 1, and the elastic modulus of the material of the second adhesive layer 4 is greater than the elastic modulus of the material of the first adhesive layer 3.

[0027] The display device provided by the embodiment of the present 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 arranged between the backlight surface of the display panel 2 and the frame 1, and the elastic modulus of the material of the first adhesive layer 3 is smaller than the elastic modulus of the material of the second adhesive layer 4. The first adhesive layer 3 is easily deformed when subjected to force, 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 the boundary stress concentration of the packaging glue 21, and improving the mechanical strength. The second adhesive layer 4 with a high elastic modulus has good 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 bottom plate 11 and a side plate 12 connected to the bottom plate 11. The bottom plate 11 and the side plate 12 form a receiving groove.

[0029] The frame 1 can adopt an integrated structure to facilitate molding, and the integrated structure has higher structural strength. For example, the frame 1 can be integrally molded by a die-casting process, that is, the bottom plate 11 and the side plate 12 are connected as a whole, or the frame 1 can also be prepared and molded by a stamping process. Of course, the frame 1 can also adopt a split structure, that is, the bottom plate 11 and the side plate 12 can be prepared and molded separately.

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

[0031] Optionally, the encapsulation glue 21 may be Frit (glass glue). The material of the first glue layer 3 includes a single-component epoxy resin glue; and / or, the material of the second glue layer 4 includes a single-component epoxy resin glue, that is, the first glue layer 3 and the second glue layer 4 may be prepared from the same material, but the elastic modulus of the material of the second glue layer 4 must be greater than the elastic modulus of the material of the first glue layer 3 by controlling factors such as the process, or the first glue layer 3 and the second glue layer 4 may also be prepared from different materials, as long as the bonding performance and elastic modulus requirements are guaranteed.

[0032] It should be noted that, in the present embodiment, along the light emitting direction Y of the display panel 2, the first adhesive layer 3 and the packaging adhesive 21 at least partially overlap, which means that the first adhesive layer 3 is at least partially located below the packaging adhesive 21, so as to absorb and release the stress of the display panel 2 corresponding to the portion of the packaging adhesive 21, that is, to provide a stress release channel, reduce the force at the weak position (inside the packaging adhesive 21), and improve the overall strength.

[0033] Optionally, the first adhesive layer 3 and the second adhesive layer 4 can be formed by graded injection molding, for example, they can be prepared by LIPO (Low injection pressure overmolding) process, the whole process of low-pressure injection molding (low pressure + adhesive + injection + demolding): the special glue is filled into the sol cylinder of the injection molding equipment at a relatively low temperature (many materials of the screen cannot withstand high temperature) and melted. The liquid has very good fluidity after melting, and only needs very small pressure to flow into a very small mold space. After waiting for the glue to cool and solidify, it can be demolded.

[0034] In some optional embodiments, the ratio of the elastic modulus of the material of the second adhesive layer 4 to the elastic modulus of the material of the first adhesive layer 3 is greater than or equal to 2:1. For example, the ratio of the elastic modulus of the material of the second adhesive layer 4 to 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, for example, 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 that are connected to each other; the first portion 41 is disposed between the first adhesive layer 3 and the frame body 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 body 1, and the first direction X intersects with the light emitting direction Y of the display panel 2.

[0038] It should be noted that the first part 41 is disposed 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 colloid, provide good flatness, and ensure the sealing performance with the bottom plate 11 of the entire frame 1. The second part 42 is disposed 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 disposed corresponding to the side of the display panel 2 to achieve a sealed package for 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 bottom 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 disposed closer to the display panel 2 relative to the first portion 41, the first portion 41 may directly contact the bottom plate 11, and the second portion 42 may be in contact with the side of the display panel 2 and the first adhesive layer 3 along the first direction X.

[0040] See also Figure 2 In some optional embodiments, the first adhesive layer 3 extends a predetermined distance toward the second portion 42 along the first direction X, 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, the first adhesive layer 3 is restricted from extending along the first direction X toward the second portion 42, so as to transfer the stress borne by the first adhesive layer 3 to the second portion 42, and transfer the stress concentration point to the direction where the second portion 42 is located, thereby reducing the stress at the weak position (inside the packaging adhesive 21) and improving the overall strength.

[0042] Optionally, along the first direction X, the first adhesive layer 3 includes a first edge B1 close to the frame 1, and the first direction X intersects with the light emitting direction Y of the display panel 2; the display panel 2 includes an array layer 42, the encapsulation 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 close to the frame 1; along the light emitting 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, and 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 the stress from the corresponding position of the array layer 42, thereby preventing the array layer 42 from being damaged due to concentrated force.

[0044] See also Figure 2 Optionally, along the light emitting direction Y of the display panel 2 , the orthographic projection of the first edge B1 on the substrate coincides with the orthographic projection of the second edge B2 on the substrate, that is, the first edge B1 may 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 that are arranged on one side of the substrate and are stacked. An insulating layer is provided between adjacent conductive film layers. Exemplarily, the pixel driving circuit provided in 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 plate and a second plate. As an example, the gate and the first plate may be located in the first conductive layer, the second plate may be located in the second conductive layer, and the source and the drain may be located in the third conductive layer.

[0046] Optionally, the display panel 2 further includes a light-emitting functional layer 23 disposed on a side of the array layer 42 away from the packaging glue 21 . Optionally, the light-emitting functional layer 23 includes 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 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 type of the light-emitting layer can be selected without special limitation. The electron injection layer, the electron transport layer and the hole blocking layer can be arranged between the second electrode layer and the light-emitting material layer. The electron blocking layer, the hole transport layer and the hole injection layer can be arranged 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 in order to improve the hole injection efficiency, and may be gold (Au), platinum (Pt), titanium (Ti), silver (Ag), indium tin oxide (ITO, Indium Tin Oxide), zinc tin oxide (IZO) or a transparent conductive polymer (such as polyaniline), etc. For example, the first electrode layer may be made of an ITO-Ag-ITO composite material, without special limitation.

[0049] The material of the second electrode layer can be one of the metal materials such as silver (Ag), aluminum (Al), lithium (Li), magnesium (Mg), ytterbium (Yb), calcium (Ca) or indium (In), or it can be an alloy of the aforementioned metal materials, such as magnesium-silver alloy (Mg / Ag) and lithium-aluminum alloy (Li / Al), but this embodiment does not impose any limitation on this.

[0050] See also Figure 2 In some optional embodiments, along the first direction X, the encapsulation glue 21 includes a third edge B3 away from the frame body 1, the first glue layer 3 includes a fourth edge B4 away from the frame body 1, and the second glue layer 4 includes a fifth edge B5 away from the frame body 1. Along the first direction X, the first direction X intersects with the light emitting direction Y of the display panel 2; along the light emitting 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, along the light emitting direction Y of the display panel 2, the third edge B3, the fourth edge B4 and the fifth edge B5 at least partially overlap, which means that, along the light emitting direction Y of the display panel 2, the orthographic projection of the third edge B3 on the substrate, the orthographic projection of the fourth edge B4 on the substrate, and the orthographic projection of the fifth edge B5 on the substrate at least partially overlap, so as to limit the position dimensions of the first adhesive layer 3 and the second adhesive layer 4 along the first direction X to achieve the narrow frame requirement.

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

[0053] See also Figures 3 to 6 , Figure 3 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle; Figure 4 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle; Figure 5 Another embodiment of the present invention provides Figure 1In 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. The decreasing trend means that the cross-sectional area of ​​the first adhesive layer 3 can decrease evenly or in a step-like manner. Specifically, the thickness of the first adhesive layer 3 decreases 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 a trapezoid or a stepped shape formed by a combination of multiple rectangles.

[0054] In this embodiment, along the direction from the display area AA to the non-display area NA, the cross-sectional area of ​​the first adhesive layer 3 tends to decrease, 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 front and narrow in the back" structure, and the force concentration point is transferred to the narrow side position, the force unloading effect at the weak strength position is better, thereby improving the overall strength.

[0055] See also 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 relative to each other, the first surface F1 is arranged away from the display panel 2 relative to the second surface F2; the first surface F1 is arranged obliquely relative to the second surface F2.

[0056] It can be understood that, in the present embodiment, along the light emitting direction Y of the display panel 2, the cross-sectional shape of the first adhesive layer 3 can be a trapezoid, the first surface F1 and the second surface F2 correspond to the two sides of the trapezoid respectively, and the length of the side of the trapezoid away from the frame body 1 is greater than the length of the side of the trapezoid toward the frame body 1, so as to achieve a decreasing trend of the cross-sectional area of ​​the first adhesive layer 3 along the direction from the display area AA to the non-display area NA, and the inclination angle of the first surface F1 relative to the second surface F2 cannot play the role of transferring the force concentration point of the first adhesive layer 3 to the narrow side position if it is too large or too small. Optionally, the inclination angle of the first surface F1 relative to the second surface F2 can be 30° to 60°.

[0057] See also Figures 4 to 6 In some optional embodiments, 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, and the first surface F1 is arranged 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 step surface, which means that the first surface F1 may present an ascending trend along the direction from the non-display area NA to the display area AA, and may specifically present a rectangular step surface or a trapezoidal step 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 may present a progressively decreasing trend. On the same step surface, the cross-sectional areas of the first adhesive layer 3 corresponding to each position may be equal, while on different step surfaces, the cross-sectional areas of the first adhesive layer 3 corresponding to different step surfaces are different. Specifically, along the direction from the display area AA to the non-display area NA, the cross-sectional areas of the first adhesive layer 3 corresponding to each step surface are gradually reduced.

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

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

[0061] It can be understood that when the first surface F1 is a stepped surface, the corresponding sub-portions 31 can respectively form different stepped surfaces, that is, along the light emitting direction Y of the display panel 2, the thickness of each sub-portion 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-portion 31 gradually decreases.

[0062] In this embodiment, along the first direction X, the lengths of two adjacent sub-portions 31 are equal, so that the thickness of the first adhesive layer 3 changes evenly along the direction from the display area AA to the non-display area NA, which is easy to prepare and ensures that the force on the first adhesive layer 3 changes evenly to avoid stress concentration problems.

[0063] See also Figure 4 In some other optional embodiments, along the direction from the display area AA to the non-display area NA, the length of each sub-portion 31 is gradually increased, that is, the closer to the frame 1, the longer the length of the sub-portion 31 along the first direction X is, so as to progressively reduce the stress and transfer the force concentration point of the first adhesive layer 3 to the sub-portion 31 close to the frame 1, so that the force unloading effect of the weak strength position is better, thereby improving the overall strength.

[0064] Or, if Figure 6 As shown, the lengths of some of the sub-portions 31 along the first direction X may be equal, and the lengths of some of the sub-portions 31 along the first direction X may be unequal.

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

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

[0067] It can be understood that along the light emitting direction Y of the display panel 2, the thickness of the sub-portion 31 will affect the stress release effect of 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-portions 31 is equal, so that the stress release effect of each sub-portion 31 changes evenly, avoiding sudden changes that cause excessive stress on the first adhesive layer 3 at a certain location, 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-portions 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-portions 31.

[0069] See also Figures 7 and 8 , Figure 7 Another embodiment of the present invention provides Figure 1 Schematic diagram of the cross section at AA in the middle; Figure 8 Another embodiment of the present invention provides Figure 1 Schematic diagram of a cross-section at AA; in some optional embodiments, 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 relative to each other, and the first surface F1 is arranged away from the display panel 2 relative to the second surface F2; the first surface F1 is provided with a protrusion T protruding toward the second adhesive layer 4, and the protrusion T is embedded in the second adhesive layer 4.

[0070] It can be understood 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 to prevent the first adhesive layer 3 and the second adhesive layer 4 from being delaminated and improve reliability. The distance that 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. 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 selection can be made according to actual conditions.

[0071] See also Fig. 9 , Fig. 9is 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 area Q1 and a second area Q2, along the first direction X, the first area Q1 is arranged away from the frame 1 relative to the second area Q2, and the first direction X intersects with the light emitting direction Y of the display panel 2; the distribution density of the protrusions T in the first area Q1 is greater than or equal to the distribution density of the protrusions T in the second area Q2.

[0072] It can be understood that, the more the number of protrusions T is set, the larger the contact area between the protrusions T and the second adhesive layer 4 in the corresponding area, the greater the bonding force between the protrusions T and the second adhesive layer 4, the less likely they are to be separated, and the better the stress release effect. In the present embodiment, the first area Q1 is set away from the frame 1 relative to the second area Q2, that is, the first area Q1 is closer to the inner edge of the packaging glue 21 relative to the second area Q2, which can limit the distribution density of the protrusions T in the first area Q1 to be greater than the distribution density of the protrusions T in the second area Q2, so as to enhance the first area Q1's ability to absorb and release the stress of the display panel 2 corresponding to the packaging glue 21, reduce the force on the inner side of the packaging glue 21, and improve the overall strength.

[0073] Of course, the distribution density of the protrusions T in the first region Q1 may also be equal to the distribution density of the protrusions T in the second region Q2 to achieve uniform arrangement of the protrusions T and ensure consistency of connection effects of the first adhesive layer 3 and the second adhesive layer 4 at all locations.

[0074] It should be noted that, in order to make the distribution density of the protrusions T in the first area Q1 greater than or equal to the distribution density of the protrusions T in the second area Q2, the number of protrusions T in the first area Q1 can be adjusted to be greater than or equal to the number of protrusions T in the second area Q2, so as to adjust the distance between adjacent protrusions T to achieve the adjustment of the distribution density of the protrusions T. Alternatively, the shape and size of the protrusions T in the first area Q1 and the second area Q2 can be adjusted to achieve the adjustment. For example, the direct projection area of ​​the protrusions T in the first area Q1 and the second area Q2 on the frame 1 along the light emitting direction Y of the display panel 2 can be adjusted to adjust the distribution density of the protrusions T accordingly.

[0075] See also Fig.10 , Fig.10 2 is a schematic diagram of the structure of the first adhesive layer 3 provided according to another embodiment of the present invention. Optionally, along the light emitting direction Y of the display panel 2, the orthographic projection area of ​​the protrusion T in the first region Q1 on the frame body 1 is greater than the orthographic projection area of ​​the protrusion T in the second region Q2 on the frame body 1.

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

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

[0078] It can be understood 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. This embodiment can limit the protrusion height of the protrusion T in the first area Q1 along the light emitting direction Y of the display panel 2 to be greater than the protrusion height of the protrusion T in the second area Q2, so as to enhance the first area Q1's ability to absorb and release the stress of the display panel 2 corresponding to the packaging glue 21, reduce the force on the inner side of the packaging glue 21, and improve the overall strength.

[0079] In some optional embodiments, along the light emitting direction Y of the display panel 2, the cross-sectional shape of the protrusion T is at least one of a polygon and a semicircle. For example, the cross-sectional shape of the protrusion T may be a rectangle, a triangle, a semicircle, a trapezoid, etc. Optionally, in order to facilitate the embedding of the protrusion T into the second adhesive layer 4, along the light emitting direction Y of the display panel 2, the protrusion T may be gradually expanded so that the tip of the protrusion T enters the second adhesive layer 4.

[0080] Optionally, along the light emitting 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 and a circle. Combined with the cross-sectional shape of the protrusion T along the light emitting direction Y of the display panel 2, the protrusion T as a whole can be a cylinder, a cone, a rectangular cylinder, a prism, a hemisphere or other structures. The specific structure can be selected according to actual needs without special limitation.

[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, and the first adhesive layer 3 and the composite adhesive layer 5 are in contact. In this embodiment, the composite adhesive layer 5 is disposed between the display panel 2 and the first adhesive layer 3, and plays a bonding and certain buffering role. Optionally, the composite adhesive layer 5 includes a first adhesive layer, a foam layer, and a second adhesive layer that are stacked.

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

[0083] Optical adhesive 8 can specifically be OCA (Optically Clear Adhesive, optical adhesive 8). OCA adhesive is a double-sided adhesive tape without a base material obtained by making optical acrylic adhesive into a base material, and then laminating a layer of release film on the upper and lower base layers. The adhesive layer of OCA has uniform thickness and high flatness; it has high adhesion and high bonding strength after lamination. Of course, optical adhesive 8 can also use adhesive layers of other materials, such as double-sided tape.

[0084] It can be understood that the cover plate 9 is a film layer made of materials such as glass with high light transmittance, which plays a role in protecting the display panel 2. Specifically, the cover plate 9 can be made of rigid materials with relatively low cost; it can also be made of flexible materials so that the cover plate 9 can be folded, so that it can be applied 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), PET (Polyethylene Terephthalate), etc., so as to realize the bendability and foldability of the cover plate 9, which is convenient for application in the foldable display panel 2.

[0085] It can be understood that 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, and the material of the first encapsulation layer includes an inorganic material. The inorganic material may specifically be silicon nitride, silicon oxide, silicon oxynitride and the like, and may specifically be formed by a CVD (Chemical Vapor Deposition) process.

[0087] Optionally, the encapsulation layer 6 further includes a second encapsulation layer located on a side of the first encapsulation layer away from the display panel 2, and 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 by IJP (Inkjet printing) process.

[0088] Optionally, the encapsulation layer 6 also includes a third encapsulation layer located on the side of the second encapsulation layer away from the display panel 2, and the material of the third encapsulation layer includes an inorganic material. Continuing to add 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 can be the same as or different from the material of the first encapsulation layer, and there is no special limitation.

[0089] Optionally, the material of the first encapsulation layer is the same as the material of the third encapsulation layer, so that the first encapsulation layer and the third encapsulation layer can be prepared using the same equipment, which can simplify the preparation process of the display device.

[0090] The display device provided in the embodiment of the present invention can be applied to a mobile phone, or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiment of the present invention does not make any special limitations on this.

[0091] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the location process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

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

Claims

1. A display device, characterized in that: include: A frame body having a receiving slot; A display panel is located in the receiving groove, the display panel includes a display area and a non-display area adjacent to the display area, the display panel includes a packaging glue located in the non-display area, and the display panel includes a light emitting surface and a backlight surface opposite to each other; A first adhesive layer is provided between the backlight surface of the display panel and the frame body, and along the light emitting direction of the display panel, the first adhesive layer and the packaging adhesive at least partially overlap; A second adhesive layer is at least partially located between the first adhesive layer and the frame along the light emitting direction of the display panel, and the elastic modulus of the material of the second adhesive layer is greater than the elastic modulus of the material of the first adhesive layer.

2. The display device according to claim 1, characterized in that A ratio between an elastic modulus of a material of the second adhesive layer and an elastic modulus of a 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 single-component epoxy resin adhesive; and / or, The material of the second adhesive layer includes single-component epoxy resin adhesive.

5. The display device according to claim 1, characterized in that The second adhesive layer includes a first portion and a second portion connected to each other; The first portion is disposed between the first adhesive layer and the frame body, the second portion is disposed on one side of the display panel and the first adhesive layer along a first direction and connected to the frame body, and the first direction intersects with a light emitting direction of the display panel.

6. The display device according to claim 5, characterized in that: The frame includes a bottom plate and a side plate connected to the bottom plate, wherein the bottom plate and the side plate surround the receiving groove; The first adhesive layer and the first portion are both located between the display panel and the bottom 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 connected to the side plate.

7. The display device according to claim 5, characterized in that: The first adhesive layer extends toward the second portion along the first direction by a predetermined distance, so that a portion of the first adhesive layer is embedded in the second portion.

8. The display device according to claim 1, characterized in that: Along a first direction, the first adhesive layer includes a first edge close to the frame body, and the first direction intersects with a light emitting direction of the display panel; The display panel includes an array layer, the packaging glue is located on a side of the array layer away from the first glue layer, and the array layer includes a second edge close to the frame; Along the light emitting direction of the display panel, the first edge and the second edge at least partially overlap.

9. The display device according to claim 1, characterized in that: Along the first direction, the packaging glue includes a third edge away from the frame, the first glue layer includes a fourth edge away from the frame, and the second glue layer includes a fifth edge away from the frame along the first direction, and the first direction intersects with the light emitting direction of the display panel; Along the light emitting direction of the display panel, the third edge, the fourth edge and the fifth edge at least partially overlap.

10. 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 tends to decrease.

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

12. The display device according to claim 10, characterized in that: Along the light emitting direction of the display panel, the first adhesive layer includes a first surface and a second surface opposite to each other, and the first surface is arranged away from the display panel relative to the second surface; The first surface is a stepped surface.

13. The display device according to claim 10, characterized in that: Along a first direction, the first adhesive layer includes at least two connected sub-parts, and the first direction intersects with a light emitting direction of the display panel; Along the first direction, the lengths of two adjacent sub-portions are equal, or, along the direction from the display area to the non-display area, the lengths of the sub-portions are gradually increased.

14. The display device according to claim 10, characterized in that: Along a first direction, the first adhesive layer includes at least three connected sub-parts, and the first direction intersects with a light emitting direction of the display panel; The difference between the thicknesses of any two adjacent sub-sections is equal.

15. The display device according to claim 1, characterized in that: Along the light emitting direction of the display panel, the first adhesive layer includes a first surface and a second surface opposite to each other, and the first surface is arranged away from the display panel relative to the second surface; The first surface is provided with a protrusion protruding toward the second adhesive layer, and the protrusion is embedded in the second adhesive layer.

16. The display device according to claim 15, characterized in that: The first surface includes a first area and a second area, and along a first direction, the first area is arranged away from the frame relative to the second area, and the first direction intersects with a light emitting direction of the display panel; A distribution density of the protrusions in the first region is greater than or equal to a distribution density of the protrusions in the second region.

17. The display device according to claim 16, characterized in that: Along the light emitting direction of the display panel, a protrusion height of the protrusion in the first area is greater than or equal to a protrusion height of the protrusion in the second area.

18. The display device according to claim 16, characterized in that: Along the light emitting direction of the display panel, an orthographic projection area of ​​the convex portion in the first region on the frame body is larger than an orthographic projection area of ​​the convex portion in the second region on the frame body.

19. The display device according to claim 15, characterized in that: Along the light emitting direction of the display panel, the cross-sectional shape of the protrusion is at least one of a polygon and a semicircle.

20. The display device according to claim 15, characterized in that Along the light emitting direction of the display panel, the orthographic projection shape of the protrusion on the frame is at least one of a polygon and a circle.

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

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