Touch display screen and manufacturing method thereof

Abstract

The application discloses a touch display screen, comprising a touch module, a display module and a laminating layer, the touch module and the display module are bonded together by the laminating layer to form an integral structure, wherein the laminating layer comprises a micro-nano structure and a sticking part surrounding the periphery of the micro-nano structure for bonding the touch module and the display module. The application also discloses a manufacturing method of the touch display screen, which is used for manufacturing the above touch display screen. By setting the micro-nano structure and the sticking part surrounding the micro-nano structure, the touch display screen has a full-laminating effect, and the use cost of the sticking part can be reduced; meanwhile, by using the laminating layer with the design to stick the touch module and the display module, the thickness of the touch display structure can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of adhesive bonding technology for touch displays, and in particular to a touch display and its manufacturing method. Background Technology

[0002] Touchscreens on electronic devices have gained popularity, but when making external touchscreens, it is necessary to bond the touch module to the display module.

[0003] In existing technologies, when bonding touch modules and display modules, optical adhesive is typically used for full bonding. However, this method not only requires more optical adhesive, increasing costs, but also presents risks: if the adhesive layer is too thin, the touch module and display module may collide and be damaged; if the adhesive layer is too thick, it increases the overall thickness of the touch display structure.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a touch display screen and its manufacturing method, which reduces the thickness of the touch display screen while ensuring full lamination between the touch module and the display module.

[0006] The present invention provides a touch display screen, including a touch module, a display module and an adhesive layer, wherein the touch module and the display module are bonded together by the adhesive layer to form an integral structure, wherein the adhesive layer includes a micro-nano structure and an adhesive portion surrounding the micro-nano structure for bonding the touch module and the display module.

[0007] In one embodiment, the micro / nano structure has multiple protrusions, the cross-sectional shape of which is two arc-shaped sides extending from the side near the touch module toward the display module or from the side near the display module toward the touch module and intersecting.

[0008] In one embodiment, the thickness of the bonding layer is 20~200μm.

[0009] In one embodiment, the thickness of the bonding layer is 50 μm.

[0010] In one embodiment, the touch module includes a substrate, a first structural layer, an insulating support layer, and a second structural layer arranged sequentially from top to bottom. The second structural layer is disposed on the surface of the bonding layer away from the display module. The first structural layer includes a first photoresist layer and a first conductive layer, with the first conductive layer disposed on the first photoresist layer. The second structural layer includes a second photoresist layer and a second conductive layer, with the second conductive layer disposed on the second photoresist layer.

[0011] In one embodiment, the first photoresist layer has a first patterned groove, and the first conductive layer is embedded in the first patterned groove; the second photoresist layer has a second patterned groove, and the second conductive layer is embedded in the second patterned groove.

[0012] The present invention also provides a method for manufacturing a touch display screen, the method comprising:

[0013] Provide a touch module;

[0014] Provide a display module;

[0015] An adhesive layer is formed on the surface of the touch module or the display module. The adhesive layer includes a micro-nano structure and an adhesive portion surrounding the micro-nano structure for bonding the touch module and the display module.

[0016] The display module and the touch module are bonded together using the bonding layer to form a touch display screen.

[0017] In one embodiment, forming an adhesive layer on the surface of the touch module or the display module includes:

[0018] A layer of UV-curable adhesive is applied to the surface of the touch module or the display module;

[0019] The micro / nano structure is formed by imprinting and curing on the UV-curable adhesive.

[0020] An optical adhesive layer is coated around the micro / nano structure to form the adhesive portion, and the micro / nano structure and the adhesive portion form an bonding layer.

[0021] In one embodiment, the method for manufacturing the touch module includes:

[0022] Provide a transparent substrate;

[0023] A first conductive layer is prepared on the transparent substrate;

[0024] An insulating support layer is prepared on the first conductive layer;

[0025] A second conductive layer is prepared on the insulating support layer.

[0026] In one embodiment, the step of fabricating the first conductive layer on the transparent substrate specifically includes:

[0027] Apply a layer of UV-curable adhesive to the surface of a transparent substrate;

[0028] A first patterned groove is formed on the UV-curable adhesive by embossing, and after curing, a first optical adhesive layer is formed.

[0029] A first conductive layer is formed by filling the first patterned groove with conductive material.

[0030] In one embodiment, the specific steps for preparing the first conductive layer are as follows: a conductive material is printed onto the transparent substrate using a printing method, and the first conductive layer is formed after curing; or, a first patterned groove is formed on the transparent substrate using an embossing method, a conductive material is filled into the first patterned groove, and the first conductive layer is formed after curing.

[0031] In one embodiment, the specific steps for preparing the insulating support layer are as follows: a layer of UV-curable adhesive is coated on the first conductive layer, and the insulating support layer is formed after curing.

[0032] In one embodiment, the specific preparation steps of the micro / nano structure are as follows: coating a layer of UV-curable adhesive on the second conductive layer; imprinting and curing to form the micro / nano structure.

[0033] The touch display screen provided by this invention, by setting a micro-nano structure and an adhesive portion surrounding the micro-nano structure, provides support when the touch module and the display module are bonded together. This effectively prevents defects such as air bubbles caused by the touch module adsorbing onto the surface of the display module due to air gaps during bonding, thereby achieving a full bonding effect and enhancing touch sensitivity. At the same time, the bonding layer with this design, since the adhesive portion is located around the micro-nano structure, not only reduces the cost of using the adhesive portion but also reduces the bonding defect rate and effectively reduces the thickness of the touch display screen. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the touch display screen according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the touch module according to an embodiment of the present invention;

[0036] Figure 3 This is a flowchart illustrating the steps of a method for manufacturing a touch display screen according to the first embodiment of the present invention.

[0037] Figure 4 for Figure 3 Flowchart of the steps involved in manufacturing the touch module;

[0038] Figure 5 for Figure 3 Flowchart of the steps for preparing the first conductive layer;

[0039] Figure 6 for Figure 3 A flowchart illustrating the steps involved in preparing the second conductive layer. Detailed Implementation

[0040] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0041] Please refer to Figure 1 and Figure 2 The touch display screen provided in this embodiment of the invention includes a touch module 1, a display module 2, and an adhesive layer 3. The touch module 1 and the display module 2 are bonded together by the adhesive layer 3 to form an integral structure. The adhesive layer 3 includes a micro-nano structure 31 and an adhesive portion 32 surrounding the micro-nano structure 31 for bonding the touch module 1 and the display module 2.

[0042] In this embodiment, the bonding layer 3 is disposed on the surface of the touch module 1, and the cross-sectional shape of the protrusion of the micro-nano structure 31 is formed by two arc-shaped sides extending from the side near the touch module 1 toward the display module 2 and intersecting.

[0043] In other embodiments, the bonding layer 3 is disposed on the surface of the display module 2, and the cross-sectional shape of the protrusion of the micro-nano structure 31 is formed by two arc-shaped sides extending from the side near the display module 2 toward the touch module 1 and intersecting.

[0044] The adhesive part 32 is made of OCA optical adhesive; the adhesive part 32 is shaped like a square.

[0045] The thickness of the bonding layer 3 is slightly greater than the height of the micro / nano structure 31, and the thickness of the bonding layer 3 is equal to the thickness of the adhesive portion 32. Specifically, the thickness of the bonding layer is 20~200μm, preferably 50μm.

[0046] The touch module 1 also includes a substrate 11, a first structural layer 12, an insulating support layer 13, and a second structural layer 14. The substrate 11 is made of transparent PET, PC, or PMMA; the insulating support layer 13 is made of UV-curable adhesive.

[0047] The second structural layer 14 is disposed on the surface of the bonding layer 3 away from the display module 2; the insulating support layer 13 is disposed on the surface of the second structural layer 14 away from the bonding layer 3; the first structural layer 12 is disposed on the surface of the insulating support layer 13 away from the second structural layer 14; and the substrate 11 is disposed on the surface of the first structural layer 12 away from the insulating support layer 13.

[0048] The first structural layer 12 includes a first photoresist layer 121 and a first conductive layer 123, with the first conductive layer 123 disposed on the first photoresist layer 121; the second structural layer 14 includes a second photoresist layer 141 and a second conductive layer 143, with the second conductive layer 143 disposed on the second photoresist layer 141.

[0049] The first photoresist layer 121 has a first patterned groove 1213, and the first conductive layer 123 is embedded in the first patterned groove 1213; the second photoresist layer 141 has a second patterned groove 1413, and the second conductive layer 143 is embedded in the second patterned groove 1413.

[0050] Because corresponding patterned grooves are provided on both the first adhesive layer 121 and the second adhesive layer 141, the second adhesive layer 141, which serves as an insulating layer between the first conductive layer 123 and the second conductive layer 143, is relatively thin. This can cause the conductive material to penetrate through, easily leading to short circuits in the conductive layers and resulting in a very low product yield, making mass production impossible. Therefore, by providing an insulating support layer 13 between the first adhesive layer 121 and the second adhesive layer 141, the insulation effect between the first conductive layer 123 and the second conductive layer 143 is significantly improved, effectively preventing short circuits in the conductive layers. At the same time, while keeping the thickness of the touch module 1 unchanged or even thinner, the first adhesive layer 121 and the second adhesive layer 141 can be made appropriately thinner, leaving space for a separately provided insulating support layer 13 for insulation, thus further enhancing the insulation effect.

[0051] The touch module 1 also includes a surface layer 15, which is disposed on the surface of the substrate 11 away from the first structural layer 12. The surface layer 15 can be formed on the surface of the substrate by means of coating or imprinting. Specifically, the surface layer 15 is a hardened layer, which is made of UV-curable resin, nano-ceramic resin or other organic materials; the hardened layer can protect the surface of the substrate.

[0052] In other embodiments, surface layer 15 is an anti-glare layer that reduces glare on the surface of the touch display screen. Of course, surface layer 15 can also be a film layer with other functionalities.

[0053] First Embodiment

[0054] Please refer to Figure 3 The first embodiment of the present invention also provides a method for manufacturing a touch screen, the method comprising:

[0055] S1: Prepare a touch module;

[0056] S2: Provides a display module;

[0057] S3: Apply a layer of UV-curable adhesive to the surface of the touch module;

[0058] S4: Imprinting and curing on UV-curable adhesive to form a micro / nano structure with multiple protrusions;

[0059] S5: A layer of optical adhesive is coated around the micro / nano structure to form an adhesive part, and the micro / nano structure and the adhesive part form an bonding layer;

[0060] S6: The bonding layer is used to bond the display module and the touch module together to form a touch display screen.

[0061] In step S1 of preparing the touch module, as follows Figure 4 As shown, it also includes:

[0062] S11: Provides a transparent substrate;

[0063] S12: Prepare the first conductive layer on the transparent substrate;

[0064] S13: Prepare an insulating support layer on the first conductive layer;

[0065] S14: Prepare a second conductive layer on the insulating support layer.

[0066] In step S12, which involves preparing the first conductive layer on a transparent substrate, as follows: Figure 5 As shown, it also includes:

[0067] S121: Apply a layer of UV-curable adhesive to the surface of a transparent substrate;

[0068] S122: A first patterned groove is formed on a UV-curable adhesive by embossing, and a first glossy adhesive layer is formed after curing;

[0069] S123: The conductive material is filled into the first graphic groove by scraping, and after curing, a first conductive layer is formed.

[0070] The specific step S13 for preparing the insulating support layer is as follows: a layer of UV-curable adhesive is coated on the first conductive layer, and after curing, an insulating support layer is formed.

[0071] In step S14, where a second conductive layer is prepared on a transparent substrate, as follows: Figure 6 As shown, it also includes:

[0072] S141: Apply a layer of UV-curable adhesive to the insulating support layer;

[0073] S142: A second patterned groove is formed on the UV-curable adhesive by embossing, and a second glossy adhesive layer is formed after curing;

[0074] S143: The conductive material is filled into the second graphic groove by scraping, and a second conductive layer is formed after curing.

[0075] Following step S14, a surface layer preparation step S15 is also included. When the surface layer is a hardened coating, step S15 specifically involves: coating a UV-curable resin layer or a nano-ceramic resin layer onto the surface of the transparent substrate away from the first conductive layer, and curing it to form a hardened coating. Alternatively, aluminum or other inorganic materials can be plated onto the surface of the transparent substrate away from the first conductive layer to form a hardened coating.

[0076] When the surface layer is an anti-glare layer, step S15 specifically involves: coating a UV-curable adhesive layer on the surface of the transparent substrate away from the first conductive layer, forming an anti-glare structure by imprinting, and forming an anti-glare layer after curing.

[0077] In step S3, UV-curable adhesive is applied to the second conductive layer.

[0078] Second Embodiment

[0079] The difference between the touch display manufacturing method provided in the second embodiment of the present invention and the first embodiment is that, in this embodiment, the first conductive layer is directly prepared on a transparent substrate.

[0080] In this embodiment, the specific steps for preparing the first conductive layer are as follows: forming a first patterned groove on a transparent substrate by imprinting; filling the first patterned groove with conductive material, and then curing it to form the first conductive layer.

[0081] In other embodiments, the specific steps for preparing the first conductive layer are as follows: a conductive material is printed onto a transparent substrate using a printing method, and the first conductive layer is formed after curing.

[0082] Third Embodiment

[0083] The difference between the method for manufacturing a touch display screen provided in the third embodiment of the present invention and the first embodiment described above is that, in this embodiment, the bonding layer is prepared on the surface of the display module.

[0084] In this embodiment, the specific steps for preparing the micro-nano structure are as follows: a layer of UV-curable adhesive is coated on the surface of the display module; after imprinting and curing, a micro-nano structure is formed.

[0085] This invention has many advantages.

[0086] 1. By setting up micro-nano structures and adhesive parts surrounding the micro-nano structures, the touch display screen can achieve a full bonding effect while reducing the cost of adhesive parts and supporting the touch module or display module. Furthermore, since the adhesive parts are located around the micro-nano structures, the bonding defect rate can be reduced, thereby reducing the probability of rework. At the same time, by using this type of bonding layer to bond the touch module and the display module, the thickness of the touch display structure can be effectively reduced.

[0087] 2. The cross-sectional shape of the protrusions of the micro-nano structure is two arc-shaped edges that extend towards the display module or the touch module and intersect. The micro-nano structure not only serves to support and buffer the display module or the touch module, but also prevents air bubbles from forming when the touch module and the display module are bonded together, thereby enhancing the bonding firmness and the touch sensitivity of the touch screen.

[0088] 3. An insulating support layer is set between the first structural layer and the second structural layer. While strengthening the insulation effect, the insulating support layer forms a composite layer structure with the first and second structural layers, which increases the bending resistance of the conductive film, further improves the stability of the product, and expands the application scenarios of the product, making it suitable for the needs of flexible screens and other multi-touch applications.

[0089] In the accompanying drawings, the dimensions and relative dimensions of layers and regions are exaggerated for clarity. It should be understood that when an element, such as a layer, region, or substrate, is referred to as "formed on," "disposed on," or "located on" another element, the element may be directly disposed on said other element, or there may be intermediate elements present. Conversely, when an element is referred to as "directly formed on" or "directly disposed on" another element, there are no intermediate elements.

[0090] In this article, the sequential adjectives "first," "second," etc., used to describe elements are merely to distinguish elements with similar attributes and do not imply that the elements described in this way must follow a given order, or be subject to time, space, hierarchy, or other restrictions.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0093] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A touch display screen, characterized in that, The device includes a touch module, a display module, and an adhesive layer. The touch module and the display module are bonded together by the adhesive layer to form an integral structure. The adhesive layer includes a micro / nano structure and an adhesive portion surrounding the micro / nano structure for bonding the touch module and the display module. The micro / nano structure has multiple protrusions, and the cross-sectional shape of each protrusion is that two arc-shaped sides extend from the side near the touch module toward the display module or from the side near the display module toward the touch module and intersect. The thickness of the adhesive layer is slightly greater than the height of the micro / nano structure, and the thickness of the adhesive layer is equal to the thickness of the adhesive portion.

2. The touch display screen as described in claim 1, characterized in that, The thickness of the bonding layer is 20~200μm.

3. The touch display screen as described in claim 2, characterized in that, The thickness of the bonding layer is 50 μm.

4. The touch display screen as described in claim 1, characterized in that, The touch module includes a substrate, a first structural layer, an insulating support layer, and a second structural layer arranged sequentially from top to bottom. The second structural layer is disposed on the surface of the bonding layer away from the display module. The first structural layer includes a first photoresist layer and a first conductive layer, with the first conductive layer disposed on the first photoresist layer. The second structural layer includes a second photoresist layer and a second conductive layer, with the second conductive layer disposed on the second photoresist layer.

5. The touch display screen as described in claim 4, characterized in that, The first photoresist layer has a first patterned groove, and the first conductive layer is embedded in the first patterned groove; the second photoresist layer has a second patterned groove, and the second conductive layer is embedded in the second patterned groove.

6. A method for manufacturing a touch display screen, used to manufacture a touch display screen as described in any one of claims 1-5, characterized in that, The method includes: Provide a touch module; Provide a display module; An adhesive layer is formed on the surface of the touch module or the display module. The adhesive layer includes a micro-nano structure and an adhesive portion surrounding the micro-nano structure for bonding the touch module and the display module. The display module and the touch module are bonded together using the bonding layer to form a touch display screen.

7. The method for manufacturing a touch display screen as described in claim 6, characterized in that, The process of forming an adhesive layer on the surface of the touch module or the display module includes: A layer of UV-curable adhesive is applied to the surface of the touch module or the display module; The micro / nano structure is formed by imprinting and curing on the UV-curable adhesive. An optical adhesive layer is coated around the micro / nano structure to form the adhesive portion, and the micro / nano structure and the adhesive portion form an bonding layer.

8. The method for manufacturing a touch display screen as described in claim 6, characterized in that, The method for manufacturing the touch module includes: Provide a transparent substrate; A first conductive layer is prepared on the transparent substrate; An insulating support layer is prepared on the first conductive layer; A second conductive layer is prepared on the insulating support layer.

9. The method for manufacturing a touch display screen as described in claim 8, characterized in that, The specific steps of preparing the first conductive layer on the transparent substrate are as follows: Apply a layer of UV-curable adhesive to the surface of a transparent substrate; A first patterned groove is formed on the UV-curable adhesive by embossing, and after curing, a first optical adhesive layer is formed. A first conductive layer is formed by filling the first patterned groove with conductive material.

10. The method for manufacturing a touch display screen as described in claim 8, characterized in that, The specific steps for preparing the first conductive layer are as follows: a conductive material is printed on the transparent substrate using a printing method, and the first conductive layer is formed after curing; or, a first patterned groove is formed on the transparent substrate using an embossing method, a conductive material is filled into the first patterned groove, and the first conductive layer is formed after curing.

11. The method for manufacturing a touch display screen as described in claim 8, characterized in that, The specific steps for preparing the insulating support layer are as follows: a layer of UV-curable adhesive is coated on the first conductive layer, and the insulating support layer is formed after curing.

12. The method for manufacturing a touch display screen as described in claim 8, characterized in that, The specific preparation steps of the micro / nano structure are as follows: a layer of UV-curable adhesive is coated on the second conductive layer; the micro / nano structure is formed after imprinting and curing.

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