Display device, display edge sealing method and equipment

Abstract

The invention belongs to the technical field of display device sealing, and discloses a display device and a display edge sealing method and equipment. The display device comprises a displayer and a sealing structure arranged on the back of the displayer, the sealing structure comprises side walls and a sealing filling part, the side walls are arranged on the surface of the back of the displayer and constructed in a layer-by-layer accumulation mode, and the side walls define a sealing area; the sealing filling part is arranged in the sealing area and is formed by injecting sealant in a layer-by-layer filling mode. According to the display device, production of the sealing structure on the display device gets rid of dependence on molds and low-pressure glue injection equipment, and the display device has the advantages that the production cost is reduced, the production efficiency is improved, the adaptability is enhanced and the like, and can meet the requirements in the fields of consumer electronics, industrial display, automobile display and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of display device sealing, and in particular to a display device, a display edge sealing method and equipment. Background Art

[0002] Display devices (such as car displays, smart phones, tablets, LED screens, etc.) are components used to display images or information. Current display devices generally include a display and a back cover. The back cover is used to protect the electronic components and structural frame inside the display. The edge sealing technology of the display is a key technology to ensure the stable operation of the display device in a complex environment. Its core function is to isolate the back of the display from the external environment through physical barriers and chemical bonding. Its main functions include waterproofing, dustproofing, impact resistance, and electromagnetic shielding.

[0003] The edge sealing of the current display is achieved through an annular sealing structure on the back of the display. The sealing structure adopts low-pressure injection molding. Specifically, the edge of the display is first fixed with a high-precision silicone mold, and then the ultraviolet light curing adhesive is injected into the mold cavity through a low-pressure injection device. After the glue fills the mold cavity with a complex structure, the glue is cured by a curing device, and then demolding is carried out and excess colloid is removed.

[0004] From the above, although the low-pressure injection molding process has the potential for high precision and automation, the current display device is updated and iterated at a fast speed, and the manufacturing of silicone molds involves precision processing and material matching. The cost of a single set can reach thousands to tens of thousands of yuan, and the lifespan is only hundreds of times. If a mold is customized for each product separately, the company's production costs will be greatly increased; secondly, the glue may produce cracks due to volume shrinkage during the curing process, causing the sealing performance to deteriorate. If the shrinkage rate is improved by adding fillers, the transmittance and weather resistance will be sacrificed, resulting in a decrease in the curing speed; in addition, current electronic products tend to have narrow bezel designs, and traditional molds are difficult to meet the sealing requirements of ultra-narrow bezels, which can easily cause edge stress concentration.

[0005] Therefore, the above problems need to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to provide a display device, a display edge sealing method and equipment to get rid of the dependence on molds, thereby reducing the production cost of the enterprise and meeting the current diverse sealing needs.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A display device includes a display and a sealing structure arranged at the back of the display, wherein the sealing structure includes:

[0009] A side wall is disposed on the back surface of the display and is constructed in a layer-by-layer accumulation manner, wherein the side wall defines a sealing area;

[0010] The sealing filling part is arranged in the sealing area and is formed by injecting the sealant in a layer-by-layer filling manner.

[0011] Preferably, the side wall comprises:

[0012] A first dam tape is arranged in a closed ring shape; and

[0013] A second damming tape is arranged at intervals on the outer circle of the first damming tape;

[0014] The sealing filling portion is arranged between the first damming tape and the second damming tape.

[0015] A display edge sealing method comprises the following steps:

[0016] On the back of the display, a dispensing device is used to build a side wall in a layer-by-layer cumulative manner, wherein the side wall is used to define a sealing area;

[0017] curing the sidewalls of each accumulation layer;

[0018] In the sealing area, a sealant is injected in a layer-by-layer filling manner using a dispensing device;

[0019] The sealant of each filling layer is cured.

[0020] Preferably, the constructing side wall comprises:

[0021] A first dam tape and a second dam tape are constructed in a layer-by-layer cumulative manner using a dispensing device, wherein the first dam tape is arranged in a closed ring, and the second dam tape is arranged at intervals on the outer ring of the first dam tape to form the sealing area between the first dam tape and the second dam tape.

[0022] Preferably, the construction of the first dam tape and the second dam tape comprises:

[0023] The first dam tape is constructed first, and then the second dam tape is constructed.

[0024] Preferably, the speed at which the glue dispensing device injects sealant into the sealing area is greater than the speed at which the glue dispensing device constructs the side wall.

[0025] Preferably, the viscosity of the glue used to construct the side wall is greater than the viscosity of the sealant.

[0026] Preferably, the sealant is a highly thixotropic glue.

[0027] A display edge sealing device, the display edge sealing device comprising:

[0028] A dispensing system configured to perform a layer-by-layer dispensing operation on a back surface of the display;

[0029] a curing system configured to cure the glue after dispensing; and,

[0030] The control system is configured to control the dispensing system and the curing system to perform the following steps:

[0031] Building a side wall at the back of the display in a layer-by-layer cumulative manner, the side wall being used to define a sealing area;

[0032] curing the sidewalls of each accumulation layer;

[0033] Injecting sealant into the sealing area in a layer-by-layer filling manner;

[0034] The sealant of each filling layer is cured.

[0035] Preferably, the glue dispensing system comprises a glue dispensing device and a glue supplying device, wherein the glue supplying device is configured to supply high thixotropic glue and low viscosity glue to the glue dispensing device, respectively, for constructing the side wall and filling the sealing area, respectively.

[0036] Beneficial effects of the present invention:

[0037] The display device of the present invention forms a sealing structure on the back of the display through side walls and a sealing filling part, wherein the side walls are constructed by a layer-by-layer accumulation method, and the sealing filling part is obtained by filling the sealant layer by layer; firstly, this sealing structure does not require the use of molds and low-pressure glue injection equipment during the production process, thereby saving the costs of developing, manufacturing and maintaining molds, and also saving the procurement costs of low-pressure glue injection equipment, greatly reducing the production cost; secondly, the glue cures faster during the layer-by-layer accumulation process, which can shorten the molding time while ensuring the strength, thereby improving production efficiency; in addition, the shape design of the sealing structure is not limited to the demolding direction, thereby greatly enhancing the adaptability, and is particularly suitable for currently popular narrow-frame display devices, ultra-thin display devices and other occasions with higher packaging requirements, and can meet the needs of consumer electronics, industrial displays, automotive displays and other fields.

[0038] The display edge sealing method of the present invention first forms a side wall on the back of the display by dispensing glue layer by layer, and then injects sealant into the sealing area by filling layer by layer, and finally forms a sealing structure to seal the edge of the display; compared with the existing technology of sealing by producing a sealing structure through mold forming, this sealing method has the advantages of cost saving, efficiency improvement and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a display device of the present invention;

[0040] Figure 2 is a cross-sectional view of the display device of the present invention along its thickness direction;

[0041] Figure 3 1 is a flow chart of a display edge sealing method of the present invention.

[0042] In the figure:

[0043] 100. Display; 200. Sealing structure; 1. Side wall; 11. First dam tape; 12. Second dam tape; 2. Sealing area; 3. Sealing filling part. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] Refer to the following Figures 1 to 3 The display device, display edge sealing method and equipment provided by the present invention are described.

[0049] Reference Figure 1 and Figure 2 In a first aspect, the present embodiment provides a display device, comprising a display 100, a back cover and a sealing structure 200, wherein the back cover is disposed on the back of the display 100, and the sealing structure 200 is located on the back of the display 100 and seals a gap between the display 100 and the back cover.

[0050] Specifically, the sealing structure 200 includes a side wall 1 and a sealing filling portion 3, wherein the side wall 1 is constructed in a layer-by-layer accumulation manner, and the side wall 1 defines a sealing area 2 on the back of the display 100. In this embodiment, the side wall 1 is constructed by dispensing glue layer by layer through a dispensing device. The sealing filling portion 3 is arranged in the sealing area 2 and is formed by injecting sealant in a layer-by-layer filling manner, so that the sealing filling portion 3 formed after the sealant is cured is bonded to the side wall 1 to ensure the strength of the sealing structure 200.

[0051] Based on the above, the sealing structure 200 can be formed by dispensing equipment, which gets rid of the dependence on molds and low-pressure glue injection equipment, not only saving a lot of costs, but also improving work efficiency. The shape of the sealing structure 200 can be adjusted arbitrarily according to the specifications and sealing requirements of the display 100. It is particularly suitable for the current popular narrow-frame display devices, ultra-thin display devices and other occasions with higher packaging requirements, and can meet the needs of multiple fields such as consumer electronics, industrial displays, and automotive displays.

[0052] Furthermore, the side wall 1 includes a first dam tape 11 and a second dam tape 12, the first dam tape 11 is arranged in a ring shape, the second dam tape 12 is located at the outer ring of the first dam tape 11, the first dam tape 11 and the second dam tape 12 are arranged at intervals, so that a sealing area 2 is defined between the first dam tape 11 and the second dam tape 12, and the sealing filling portion 3 is arranged between the first dam tape 11 and the second dam tape 12. A three-layer sealing structure 200 is formed on the back of the display 100 by sequentially arranging the first dam tape 11, the sealing filling portion 3 and the second dam tape 12, which helps to improve the sealing performance of the display device.

[0053] Reference Figure 3 In a second aspect, the present embodiment further provides a display edge sealing method, the display edge sealing method comprising the following steps:

[0054] S1. On the back of the display 100, a side wall 1 is constructed in a layer-by-layer accumulation manner using a dispensing device, and the side wall 1 is used to define a sealing area 2. During the layer-by-layer accumulation process, the side wall 1 of each accumulated layer is cured.

[0055] S2. In the sealing area 2, the sealant is injected layer by layer using a glue dispensing device; during the layer by layer filling process, the sealant of each filling layer is cured.

[0056] Based on the above, in the display edge sealing method of the present invention, the sealing structure 200 can be processed on displays 100 of various specifications and shapes only by using a dispensing device integrated with a curing system or by using a dispensing device in conjunction with a curing system, so that several different sealing structures 200 can be quickly produced without using molds and low-pressure glue injection equipment. First, the related costs of the mold and the purchase costs of the low-pressure glue injection equipment are saved, reducing the production cost; second, the fast fixation can be achieved during the dispensing process, improving the production efficiency; in addition, the limitation of the mold removal direction on the shape of the sealing structure 200 when the mold is applied is broken, and the processing of various complex shapes can be satisfied; through the precision dispensing technology and the curing process, the integrity and strength of the edge position of the sealing structure 200 can be ensured, further improving the reliability of the sealing structure 200.

[0057] Preferably, the dispensing equipment in this embodiment is a five-axis dispensing machine with a curing system. The five-axis dispensing machine uses a high-precision servo motor and control system, which can achieve precise control of the position and amount of glue, ensure the accuracy of dispensing, avoid problems such as glue overflow or insufficient dispensing, and thus improve the quality and reliability of the product. In addition, the five-axis dispensing machine can realize automated dispensing, greatly improving production efficiency and reducing errors and rework rates caused by human factors.

[0058] It is worth noting that, since the five-axis dispensing machine integrates a curing system, the glue after dispensing can be directly cured by the curing system. Of course, in some other embodiments, the glue can also be cured by other curing equipment, such as an ultraviolet light source or a hot air blower.

[0059] Further, in step S1, constructing the side wall 1 includes: using a dispensing device to construct a first dam tape 11 and a second dam tape 12 in a layer-by-layer accumulation manner, and the first dam tape 11 needs to be constructed first, and then the second dam tape 12. The first dam tape 11 is arranged in a closed ring, and the second dam tape 12 is arranged at intervals on the outer ring of the first dam tape 11 to form a sealing area 2 between the first dam tape 11 and the second dam tape 12. It should be noted that the layer-by-layer accumulation means stacking layer by layer along the thickness direction of the display 100, and the specific number of layers can be determined according to design requirements and the performance of the glue.

[0060] In this embodiment, the second dam tape 12 is arranged on the outer ring of the first dam tape 11, so that the first dam tape 11 is used as the inner ring, and it is more convenient to operate on the outer periphery of the inner ring, and it can also prevent the dispensing head from accidentally touching the first dam tape 11, and can appropriately increase the dispensing speed of the second dam tape 12. Optionally, in some other embodiments, the second dam tape 12 can also be used as the inner ring.

[0061] In addition, since the side wall 1 of each accumulated layer is cured separately during the layer-by-layer accumulation process, not only the curing speed is fast, but also each layer is glued on the cured glue, which can ensure the accuracy and strength of the first dam tape 11 and the second dam tape 12. The shrinkage of the glue can also be evaluated timely and accurately, and the number of layers can be adjusted according to the actual operation situation to reduce the adverse effects of the shrinkage of the glue on the sealing effect. Compared with the existing mold molding, the requirements for the shrinkage of the glue are lower, that is, the selectivity of the glue is wider.

[0062] In step S2, the speed at which the glue dispensing device injects sealant into the sealing area 2 is greater than the speed at which the glue dispensing device constructs the side wall 1. The molding speed of the sealing structure 200 can be accelerated by increasing the glue dispensing speed in step S2, thereby improving work efficiency.

[0063] Furthermore, in step S2, the viscosity of the glue used to construct the side wall 1 is greater than the viscosity of the sealant, and the area and shape of the first dam tape 11 and the second dam tape 12 are limited by the glue with poor fluidity, so as to prevent the glue from flowing out of control during the dispensing process and improve the curing speed of the glue. Filling the sealant with better fluidity into the sealing area 2 can not only improve the dispensing speed, but also make the sealant completely fill the sealing area 2, prevent bubbles from being generated inside the sealing area 2, and improve the molding quality of the sealing structure 200.

[0064] Preferably, the glue used to construct the side wall 1 is a highly thixotropic glue, and the highly thixotropic glue contains polyurethane acrylate. Thixotropy refers to a property in which the viscosity of an object (such as a colloid, a suspension, etc.) changes when subjected to shear force. For highly thixotropic glue, when an external force is applied (such as stirring, smearing, etc.), its viscosity will decrease, and its fluidity will increase, making it easier to construct; and when the external force stops, the glue will gradually restore its higher viscosity, maintaining a stable shape and performance, and is suitable for occasions where precise control of the flow of the glue and the range of application is required. In addition, highly thixotropic glue also has good adhesion, weather resistance, chemical corrosion resistance and other properties, which can meet the use requirements of different fields and scenarios.

[0065] The high thixotropic glue in this embodiment also contains polyurethane acrylate, which has excellent adhesion and curing speed and can be cured by a photoinitiator, thereby improving the curing efficiency.

[0066] On the other hand, this embodiment further provides a display edge sealing device, which is used to implement the above-mentioned display edge sealing method. For the specific structure of the display edge sealing device, please refer to the following content of this embodiment.

[0067] The display edge sealing device includes a dispensing system, a curing system and a control system. The dispensing system is configured to dispense glue layer by layer on the back surface of the display 100 and control the flow, speed and path of the glue; the curing system is configured to cure the glue after dispensing. The control system is configured to control the dispensing system and the curing system to perform the following steps:

[0068] S1. A side wall 1 is constructed on the back of the display 100 in a layer-by-layer manner, and the side wall 1 is used to define a sealing area 2. During the layer-by-layer accumulation process, the side wall 1 of each accumulated layer is cured. The side wall 1 includes a first dam tape 11 and a second dam tape 12. The first dam tape 11 is arranged in a ring shape, and the second dam tape 12 is located on the outer circle of the first dam tape 11. The first dam tape 11 and the second dam tape 12 are arranged at intervals, so that the first dam tape 11 and the second dam tape 12 define a sealing area 2.

[0069] S2, injecting sealant into the sealing area 2 in a layer-by-layer filling manner; in the process of layer-by-layer filling, curing the sealant of each filling layer.

[0070] The control system is used to control the dispensing system and the curing system to perform automatic operations, construct the side wall 1 on the back of the display 100 and fill the sealing area 2, so as to realize the automatic molding of the sealing structure 200, thereby improving production efficiency.

[0071] Specifically, the glue dispensing system includes a glue dispensing device and a glue supply device, wherein the glue dispensing device is any five-axis glue dispensing system in the prior art, capable of high-precision glue dispensing. The glue supply device is configured to supply high thixotropic glue and low viscosity glue to the glue dispensing device, respectively, for construction of the side wall 1 and filling of the sealing area 2, respectively.

[0072] Exemplarily, the curing system is any UV curing system in the prior art, which can use a high-intensity UV light source to quickly irradiate the glue, causing it to undergo a curing reaction in a short time, thereby achieving rapid fixation and bonding. The UV curing system usually includes optical components such as a UV light source, a reflector, and a lens to ensure that the ultraviolet light can evenly irradiate the surface of the glue. The dispensing and curing processes are completed on the same device, without waiting for the glue to dry or using additional curing equipment, which greatly improves production efficiency.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A display device, comprising a display (100) and a sealing structure (200) arranged on the back of the display (100), characterized in that: The sealing structure (200) comprises: A side wall (1) is disposed on the back surface of the display (100) and is constructed in a layer-by-layer accumulation manner, wherein the side wall (1) defines a sealing area (2); The sealing filling portion (3) is arranged in the sealing area (2) and is formed by injecting the sealing glue in a layer-by-layer filling manner.

2. A display device according to claim 1, characterized in that: The side wall (1) comprises: A first dam tape (11) is arranged in a closed ring shape; and A second damming tape (12) is arranged at intervals on the outer circle of the first damming tape (11); The sealing filling portion (3) is arranged between the first damming tape (11) and the second damming tape (12).

3. A display edge sealing method, characterized in that: The following steps are involved: On the back of the display (100), a side wall (1) is constructed in a layer-by-layer cumulative manner using a dispensing device, wherein the side wall (1) is used to define a sealing area (2); Performing a curing treatment on the side wall (1) of each accumulation layer; In the sealing area (2), a sealing glue is injected in a layer-by-layer filling manner using a glue dispensing device; The sealant of each filling layer is cured.

4. A display edge sealing method according to claim 3, characterized in that: The side wall construction (1) comprises: A first dam tape (11) and a second dam tape (12) are constructed in a layer-by-layer cumulative manner using a dispensing device, wherein the first dam tape (11) is arranged in a closed ring shape, and the second dam tape (12) is arranged at intervals on the outer ring of the first dam tape (11), so as to form the sealing area (2) between the first dam tape (11) and the second dam tape (12).

5. A display edge sealing method according to claim 4, characterized in that: The method of constructing the first dam tape (11) and the second dam tape (12) comprises: The first dam tape (11) is constructed first, and then the second dam tape (12) is constructed.

6. A display edge sealing method according to claim 3, characterized in that: The speed at which the glue dispensing device injects the sealant into the sealing area (2) is greater than the speed at which the glue dispensing device constructs the side wall (1).

7. The display edge sealing method according to claim 3, characterized in that: The viscosity of the glue used to construct the side wall (1) is greater than the viscosity of the sealant.

8. The display edge sealing method according to claim 7, characterized in that: The sealant is a highly thixotropic glue.

9. Display edge sealing device, characterized in that The display edge sealing device comprises: A glue dispensing system configured to perform a layer-by-layer glue dispensing operation on the back surface of the display (100); a curing system configured to cure the glue after dispensing; and, The control system is configured to control the dispensing system and the curing system to perform the following steps: A side wall (1) is constructed on the back of the display (100) in a layer-by-layer manner, wherein the side wall (1) is used to define a sealing area (2); Performing a curing treatment on the side wall (1) of each accumulation layer; Injecting sealant into the sealing area (2) in a layer-by-layer filling manner; The sealant of each filling layer is cured.

10. The display edge sealing device according to claim 9, characterized in that: The glue dispensing system comprises a glue dispensing device and a glue supply device, wherein the glue supply device is configured to supply high thixotropic glue and low viscosity glue to the glue dispensing device respectively, so as to be used for constructing the side wall (1) and filling the sealing area (2) respectively.

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