Display device and manufacturing method thereof

Abstract

The present application provides a display device and a method for manufacturing the same. The display device includes: a display panel; a cover plate disposed opposite the display panel; a connecting layer located between the cover plate and the display panel, and disposed in a non-display area between the cover plate and the display panel; the connecting layer is formed by solidifying liquid glue; wherein a negative pressure cavity is formed between the display panel, the cover plate, and the connecting layer. The display device of the present application can improve the problem that the existing bonding process cannot achieve low difficulty and low cost while ensuring a seal between the display panel and the cover plate.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display device and a method for manufacturing the same. Background Art

[0002] With the development of information technology, display panels have been widely used in various industries. To protect display panels from impact, scratches, and other impacts, a protective cover is usually added in front of the display panel. Currently, to achieve a seal between the display panel and the cover, full lamination and zero lamination processes are commonly used. However, both of these processes have high lamination requirements and high costs. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a display device and a preparation method thereof, so as to improve the problem that "the existing bonding process cannot achieve low difficulty and low cost of the bonding process while ensuring the sealing between the display panel and the cover plate."

[0004] The present invention is achieved in that:

[0005] In a first aspect, an embodiment of the present application provides a display device, comprising: a display panel; a cover plate, arranged opposite to the display panel; a connecting layer, located between the cover plate and the display panel, and arranged in a non-display area of the cover plate and the display panel; the connecting layer is formed by solidifying liquid glue; wherein a negative pressure cavity is formed between the display panel, the cover plate and the connecting layer.

[0006] In an embodiment of the present application, a connecting layer formed by solidifying liquid glue is provided between the cover plate and the display panel, and a negative pressure cavity is formed between the display panel, the cover plate, and the connecting layer. The connecting layer and the negative pressure cavity together serve to bond the display panel and the cover plate, thereby ensuring a seal between the cover plate and the display panel. Furthermore, when manufacturing the display device, only the display panel and the cover plate need to be bonded together using liquid glue, resulting in a simple manufacturing process. Compared to existing bonding processes that require large amounts of glue or other additional structural components, the cost of the display device is also low.

[0007] In combination with the technical solution provided in the first aspect above, in some possible implementations, the viscosity of the liquid glue is greater than or equal to 50 Pa·s, and its elongation is greater than or equal to 200%.

[0008] In the embodiments of the present application, the viscosity of the liquid glue is set to be greater than or equal to 50 Pa·s to ensure that the glue is properly shaped after dispensing. In addition, the elongation of the liquid glue is set to be greater than or equal to 200%, which ensures that the cover plate and display panel are resistant to mechanical vibration and thermal expansion and contraction after bonding, thereby improving the stability of the display device.

[0009] In combination with the technical solution provided in the first aspect above, in some possible implementations, the pressure of the negative pressure chamber is 0.5 to 0.99 atmospheres.

[0010] In the embodiment of the present application, the pressure of the negative pressure chamber is set to 0.5 to 0.99 atmospheres, which can have a bonding effect on the cover plate and the display panel, thereby achieving sealing between the cover plate and the display panel.

[0011] In combination with the technical solution provided in the first aspect above, in some possible implementations, the thickness of the connecting layer is 20 um to 200 um.

[0012] In the embodiment of the present application, the thickness of the connection layer is set to between 20um and 200um, which can ensure a tight connection between the display panel and the cover plate, thereby ensuring that the display panel, the cover plate and the connection layer are in a sealed state.

[0013] In combination with the technical solution provided in the first aspect above, in some possible implementations, the surface of the display panel closest to the cover plate and / or the surface of the cover plate closest to the display panel is a matte surface.

[0014] In the embodiments of the present application, due to the presence of an air layer between the display panel and the cover plate, the display device has at least three reflective surfaces. Since reflected light (from the same source) reflects off different reflective surfaces with different optical path lengths, Newton rings are likely to occur, thereby affecting the usability of the display device. Therefore, setting the surface of the display panel closest to the cover plate, or the surface of the cover plate closest to the display panel, to a matte surface, or setting both the surface of the display panel closest to the cover plate and the surface of the cover plate closest to the display panel to a matte surface, can eliminate the effect of Newton rings and thus ensure the clarity of the display device.

[0015] In combination with the technical solution provided in the first aspect above, in some possible implementations, the haze value of the matte surface is 4% to 20%.

[0016] In the embodiment of the present application, the haze value of the matte surface is set to 4% to 20%, which can eliminate the influence of Newton rings between the display panel and the cover plate. The purpose of eliminating Newton rings will not be achieved due to the haze value being set too low, nor will the display device be unclear due to the haze value being set too high.

[0017] In combination with the technical solution provided in the first aspect above, the display panel and the cover plate have the same size.

[0018] In a second aspect, an embodiment of the present application provides a method for preparing a display device, the method comprising: dispensing liquid glue on a non-display area of a display panel; when the dispensed glue area is cured to a preliminary cured state, adhering a cover plate to the surface of the display panel having the liquid glue, the preliminary cured state being a state in which the liquid glue can be compressed to a preset size by the gravity of the cover plate when the cover plate is adhered to the display panel.

[0019] In the embodiments of the present application, when the glue-applied area has cured to a pre-cured state, the cover plate is bonded to the surface of the display panel with the liquid glue. This allows the pre-cured liquid glue to be compressed to a predetermined size by the weight of the cover plate itself. Furthermore, manufacturing the display device in this manner reduces the difficulty of the bonding process and eliminates the need for specialized manufacturing equipment or a specific manufacturing environment, thereby improving manufacturing convenience. Furthermore, since a large amount of glue or other additional structural components is not required, the manufacturing cost of the display device is also relatively low.

[0020] In combination with the technical solution provided in the second aspect above, in some possible implementations, dispensing liquid glue on the non-display area of the display panel includes: dispensing the liquid glue on the non-display area of the display panel simultaneously by multiple dispensing machines.

[0021] In the embodiment of the present application, multiple dispensing machines are used to dispense liquid glue on the non-display area of the display panel at the same time, which can avoid the dispensing time being too long, resulting in the glue being solidified before the dispensing is completed.

[0022] In combination with the technical solution provided in the second aspect above, in some possible implementations, the liquid glue is a moisture-curing glue or an ultraviolet light delayed-curing glue.

[0023] In the embodiment of the present application, the liquid glue is set to moisture-curing glue or ultraviolet light delayed-curing glue, which can make the liquid glue exist in a preliminary cured state after dispensing, thereby facilitating the subsequent bonding of the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic structural diagram of the first display device provided in an embodiment of the present application.

[0026] Figure 2 This is a schematic structural diagram of a second display device provided in an embodiment of the present application.

[0027] Figure 3 This is a schematic structural diagram of the third display device provided in an embodiment of the present application.

[0028] Figure 4 A flowchart of the steps of a method for preparing a display device provided in an embodiment of the present application.

[0029] Figure 5 Schematic diagram of the connection between the cover plate, liquid glue and display panel provided in an embodiment of the present application.

[0030] Figure 6 Schematic diagram of the initial solidification state to the fully solidified state of the liquid glue provided in an embodiment of the present application.

[0031] Icon: 100-display device; 10-display panel; 20-cover plate; 30-connection layer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0033] Since the existing bonding process cannot ensure the sealing between the display panel and the cover plate while achieving low difficulty and low cost, the inventors of this application have proposed the following embodiments to solve the above problems after research and exploration.

[0034] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a first display device 100 provided in an embodiment of the present application. The display device 100 includes: a display panel 10; a cover plate 20 disposed opposite the display panel 10; and a connection layer 30 located between the cover plate 20 and the display panel 10 and disposed in the non-display area of the cover plate 20 and the display panel 10. The connection layer 30 is formed by curing liquid glue. A negative pressure chamber is formed between the display panel 10, the cover plate 20, and the connection layer 30.

[0035] The display panel 10 may be an LCD (Liquid Crystal Display) display panel, an OLED (Organic Light-Emitting Diode) display panel, a Mini LED display panel, or a Micro LED display panel, without limitation. The cover plate 20 may be made of glass or a hard organic transparent material, such as acrylic. Furthermore, the non-display area of the cover plate 20 is its silk-screened area, while the non-display area of the display panel 10 is its inactive area. Specifically, liquid glue is applied to the silk-screened area of the cover plate 20 and the inactive area of the display panel 10, with the liquid glue located between the cover plate 20 and the display panel 10.

[0036] In an embodiment of the present application, a display device 100 includes a display panel 10, a cover plate 20, and a connection layer 30. The connection layer 30 is formed by curing liquid glue and is disposed in a non-display area between the cover plate 20 and the display panel 10. A negative pressure cavity is formed between the display panel 10, the cover plate 20, and the connection layer 30. The connection layer 30 and the negative pressure cavity together serve to bond the display panel 10 and the cover plate 20, thereby ensuring a seal between the cover plate 20 and the display panel 10. Furthermore, when manufacturing the display device 100, it is only necessary to dispense liquid glue onto the non-display area of the display panel 10, wait for a preset period of time, and then bond the cover plate 20 to the surface of the display panel 10 coated with liquid glue. This simplifies the bonding process and, compared to existing bonding processes that require a large amount of glue or other additional components, reduces the manufacturing cost of the display device 100.

[0037] In this embodiment, the viscosity of the liquid glue is greater than or equal to 50 Pa·s, for example, the viscosity can be 60 Pa·s, 70 Pa·s, or 80 Pa·s. By setting the viscosity of the liquid glue to be greater than or equal to 50 Pa·s, the plasticity of the liquid glue after dispensing can be ensured. The elongation of the liquid glue is greater than or equal to 200% (2 times), for example, the elongation can be 260%, 300%, or 350%. By setting the elongation of the liquid glue to be greater than or equal to 200%, it can be ensured that the display device 100 has the performance of resisting mechanical vibration and thermal expansion and contraction, thereby improving the overall stability of the display device 100.

[0038] In addition, in this embodiment, the liquid glue is transparent, so that when the glue covers the display panel 10 , the pixels of the display device 100 will not be significantly changed.

[0039] In this embodiment, the display panel 10 and the cover plate 20 have similar or identical shapes, for example, the display panel 10 and the cover plate 20 are both rectangular, or the display panel 10 and the cover plate 20 are both circular. Figure 1 As shown, the display panel 10 and the cover plate 20 have the same size, so that the display panel 10 and the cover plate 20 are easily prepared.

[0040] like Figure 2-Figure 3 As shown, in other embodiments, the display panel 10 and the cover plate 20 have different sizes. Figure 2 As shown, the size of the cover plate 20 is smaller than that of the display panel 10; Figure 3 As shown, the size of the cover plate 20 is larger than that of the display panel 10 .

[0041] In this embodiment, the connecting layer 30 is formed by curing liquid glue, and the thickness of the connecting layer 30 is 20um to 200um, for example, the thickness of the connecting layer 30 can be 50um, 80um, 120um, or 160um. By setting the thickness of the connecting layer 30 to 20um, a tight connection between the display panel 10 and the cover plate 20 can be ensured, thereby ensuring that the display panel 10, the cover plate 20, and the connecting layer 30 are in a sealed state. In addition, the width of the connecting layer 30 is 0.5mm to 5mm, for example, the width of the connecting layer 30 can be 1mm, 2mm, 3mm, or 4mm. By setting the width of the connecting layer 30 to 0.5mm to 5mm, a tight connection between the display panel 10 and the cover plate 20 can be ensured. In addition, since the connecting layer 30 is arranged in the non-display area of the display panel 10 and the cover plate 20, the corresponding width of the connecting layer 30 should be selected according to the width of the non-display area of the display panel 10 and the cover plate 20, so as to avoid the liquid glue overflowing from the non-display area of the display panel 10 and the cover plate 20 when preparing the display device 100, causing an impact on the display area.

[0042] In this embodiment, the surface of the display panel 10 closest to the cover plate 20 and / or the surface of the cover plate 20 closest to the display panel 10 are matte surfaces. That is, the surface of the display panel 10 closest to the cover plate 20 may be matte, the surface of the cover plate 20 closest to the display panel 10 may be matte, or both the surface of the display panel 10 closest to the cover plate 20 and the surface of the cover plate 20 closest to the display panel 10 may be matte. In this way, the effect of Newton rings generated between the display panel 10 and the cover plate 20 can be eliminated.

[0043] Furthermore, in this embodiment, the haze value of the matte surface is 4% to 20%, for example, the haze value can be 6%, 10%, 15%, or 19%. By setting the haze value of the matte surface to 4% to 20%, the Newton ring effect between the display panel 10 and the cover plate 20 can be eliminated. Setting a lower haze value will not result in failure to eliminate Newton rings, nor will setting a higher haze value cause the display device 100 to be unclear.

[0044] In addition, in this embodiment, the pressure of the negative pressure cavity between the display panel 10, the cover plate 20, and the connection layer 30 is 0.5 to 0.99 atmospheres. For example, the pressure of the negative pressure cavity can be 0.6 atmospheres, 0.8 atmospheres, or 0.9 atmospheres. By setting the pressure of the negative pressure cavity to 0.5 to 0.99 atmospheres, a better stabilization effect can be achieved.

[0045] See also Figure 4 Based on the same inventive concept, combined with the structure of the display device described above, the following is combined Figure 4 The specific process and steps of the method for preparing the display device are described.

[0046] Step S101: dispensing liquid glue on the non-display area of the display panel.

[0047] The liquid glue may be a moisture-curing glue or an ultraviolet light-delayed curing glue.

[0048] Specifically, multiple dispensing machines are used to dispense liquid glue on the non-display area of the display panel at the same time.

[0049] It should be noted that the number of the above-mentioned dispensing machines can be determined based on the preset dispensing time and the operation time of the liquid glue; wherein the above-mentioned operation time is the length of time it takes for the liquid glue to complete the initial solidification state. The above-mentioned initial solidification state is the state in which the liquid glue can be compressed to a preset size by the gravity of the cover plate when the cover plate is attached to the display panel. The above-mentioned preset dispensing time is:

[0050]

[0051] In formula (1), S is the total side length of the display panel, and v1 is the movement speed of the dispensing machine. The movement speed v1 of the dispensing machine is:

[0052]

[0053] In formula (2), v2 is the dispensing valve dispensing speed, d is the dispensing head diameter, and h is the glue layer thickness.

[0054] By using formula (1) and formula (2), the preset dispensing time for a dispensing machine to dispense glue on the display panel can be obtained. According to the preset dispensing time and the liquid glue operation time, multiple dispensing machines can be set to dispense glue on the non-display area of the display panel, which can avoid the dispensing time being too long, resulting in the liquid glue being solidified before the dispensing is completed.

[0055] After the glue dispensing on the display panel is completed, step S102 is performed.

[0056] Step S102: When the glue-dispensed area is cured to a preliminary cured state, the cover plate is attached to the surface of the display panel with the liquid glue.

[0057] like Figure 5-Figure 6 As shown, Figure 5 Schematic diagram of the connection between the cover plate, liquid glue, and display panel provided in an embodiment of the present application, wherein the areas of the cover plate and display panel marked with bold black lines are non-display areas of both, and the liquid glue is located between the non-display areas. It should be noted that the solid line between the cover plate and the display panel represents the initial curing state of the liquid glue, and the dashed line rectangle represents the fully cured state of the liquid glue. Figure 6 A schematic diagram of the transition from the initial curing state to the fully cured state of the liquid glue provided in an embodiment of the present application is shown, wherein the solid line represents the initial curing state of the liquid glue, and the dashed line represents the fully cured state of the liquid glue. Specifically, when the liquid glue is cured to the initial curing state, its thickness is h1 and its width is d1. When the cover plate is attached to the display panel with the liquid glue, the cover plate's own weight compresses the liquid glue, causing the liquid glue to deform, resulting in a thickness of h2 and a width of d2 after the liquid glue is fully cured. The preset dimensions are h2 and d2 of the fully cured liquid glue, 20 μm ≤ h2 ≤ 200 μm, 0.5 mm ≤ d2 ≤ 5 mm, and h1 × d1 = h2 × d2. It should be noted that the thickness h1 and width d1 of the liquid glue in the initial curing state need to be obtained experimentally based on the weight of the cover plate and the thickness h2 and width d2 of the liquid glue in the fully cured state.

[0058] In the embodiments of the present application, when the glue-applied area has cured to a pre-cured state, the cover plate is bonded to the surface of the display panel with the liquid glue. This allows the pre-cured liquid glue to be compressed to a predetermined size by the weight of the cover plate itself. Furthermore, manufacturing the display device in this manner reduces the difficulty of the bonding process and eliminates the need for specialized manufacturing equipment or a specific manufacturing environment, thereby improving manufacturing convenience. Furthermore, since a large amount of glue or other additional structural components is not required, the manufacturing cost of the display device is also relatively low.

[0059] When the liquid glue is a UV-curable glue, an optional implementation is to irradiate the glue-applied area with UV light while it is curing to a preliminary cured state. This approach can shorten the curing time of the liquid glue on the display panel, thereby improving production efficiency.

[0060] When the liquid glue is moisture-curing glue, an optional embodiment is to leave the glue-applied area untreated during the process of curing to a preliminary cured state, allowing it to cure naturally in the air. This approach can reduce the cost of manufacturing the display device.

[0061] In addition, it should be noted that the cover plate and the display panel can be directly bonded in a standard atmospheric pressure environment, directly utilizing the negative pressure naturally formed when the cover plate and the display panel are bonded; or a negative pressure device can be used to bond the display panel and the cover plate, thereby controlling the pressure of the negative pressure cavity between the cover plate, the display panel and the connecting layer.

[0062] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0063] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0065] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display device, characterized in that: The device comprises: Display panel; a cover plate, arranged opposite to the display panel; a connecting layer, located between the cover plate and the display panel, and disposed in the non-display area of the cover plate and the display panel; the connecting layer is formed by curing liquid glue; Wherein, a negative pressure cavity is formed between the display panel, the cover plate and the connection layer; The viscosity of the liquid glue is greater than or equal to 50 Pa∙s, and its elongation is greater than or equal to 200%. The display panel and the cover plate are bonded together in a standard atmospheric pressure environment, or a negative pressure device is used to bond the display panel and the cover plate together. The surface of the display panel closest to the cover plate and / or the surface of the cover plate closest to the display panel is a matte surface.

2. The device according to claim 1, characterized in that The pressure of the negative pressure chamber is 0.5-0.99 atmospheres.

3. The device according to claim 1, characterized in that The thickness of the connecting layer is 20um~200um.

4. The device according to claim 1, characterized in that The haze value of the matte surface is 4% to 20%.

5. The device according to claim 1, characterized in that The display panel and the cover plate have the same size.

6. A method for preparing a display device according to any one of claims 1 to 5, characterized in that: The method comprises: Dispensing liquid glue on the non-display area of the display panel; When the glue-dotting area is cured to a preliminary curing state, the cover plate is attached to the surface of the display panel having the liquid glue. The preliminary curing state is a state in which the liquid glue can be compressed to a preset size by the gravity of the cover plate when the cover plate is attached to the display panel.

7. The method according to claim 6, characterized in that The dispensing of liquid glue on the non-display area of the display panel includes: The non-display area of the display panel is dispensed with the liquid glue by using a plurality of dispensing machines at the same time.

8. The method according to claim 6, characterized in that The liquid glue is moisture-curing glue or ultraviolet light delayed-curing glue.

Images