A touchscreen that reduces water ripples when pressed and its bonding process

Abstract

This application provides a touchscreen that reduces pressure-induced water ripples and its bonding process. The touchscreen includes: a liquid crystal display screen and a cover plate fully bonded together using an optical adhesive film; a backlight frame housing a backlight source and the liquid crystal display screen bonded together using a light-shielding composite adhesive tape; a first adhesive layer of the light-shielding composite adhesive tape is disposed on the front side of the first adhesive tape base facing the liquid crystal display screen for bonding the liquid crystal display screen; a third adhesive layer is disposed on the back side of the second adhesive tape base facing the backlight frame for bonding the backlight frame; the second adhesive layer bonds the first and second adhesive tape bases; both the first and second adhesive tape bases are opaque; the width of the second adhesive tape base is shorter than that of the first adhesive tape base, and the area of ​​the second adhesive layer exposed on the second adhesive tape base facing the edge area of ​​the backlight source. The light-shielding composite adhesive tape provided in this application can buffer the touchscreen when it is squeezed, thereby reducing pressure-induced water ripples.

Description

Technical Field

[0001] This application belongs to the field of liquid crystal display equipment technology, and more specifically, relates to a touch screen that can reduce water ripples when pressed and its bonding process. Background Technology

[0002] In consumer tablets and PADs, the market demands thin and light touchscreens with high screen-to-body ratios. Therefore, display module design typically addresses these needs by reducing the thickness of the backlight, LCD module, and glass cover, and narrowing the bezels on all four sides of the LCD. For example, a common characteristic of widely used touchscreens is that when pressed, the screen deforms under pressure, altering the alignment of liquid crystal molecules and causing light variations at the deformation points. This results in a water ripple-like unevenness in the display. Conventional solutions to this problem include increasing product thickness, strength, or the thickness of adhesive used to bond components. However, when the backlight module's frame has slight warping, the localized water ripple effect becomes difficult to resolve, especially since slight warping of the frame due to the backlight module's manufacturing process is often unavoidable. Therefore, effectively improving the water ripple effect of touchscreens without significantly increasing their thickness has become a pressing issue for the industry. Summary of the Invention

[0003] The purpose of this application is to provide a touch screen that can reduce water ripples when pressed, so as to solve the technical problem that touch screens in the prior art are prone to water ripples when pressed.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a touchscreen that can reduce water ripple effects when pressed, comprising:

[0005] The display module includes a cover plate, an optical adhesive film, and a touch-enabled LCD screen. The front of the LCD screen and the cover plate are fully bonded together by the optical adhesive film.

[0006] A backlight module includes a backlight source and a backlight bezel, the backlight source being housed in the backlight bezel and stacked on the back of the liquid crystal display screen; and,

[0007] Light-shielding composite tape is placed on the edge area of ​​the back of the LCD screen, and the backlight frame and the LCD screen are bonded together by the light-shielding composite tape.

[0008] The light-shielding composite tape includes a first tape base layer, a second tape base layer, a first adhesive layer, a second adhesive layer, and a third adhesive layer. The first adhesive layer is located on the front side of the first tape base layer facing the LCD screen and is used to bond the LCD screen. The third adhesive layer is located on the back side of the second tape base layer facing the backlight frame and is used to bond the backlight frame. The second adhesive layer bonds the first tape base layer and the second tape base layer. Both the first tape base layer and the second tape base layer are opaque. The width of the second tape base layer is shorter than that of the first tape base layer, and the area of ​​the second adhesive layer exposed on the second tape base layer faces the edge area of ​​the backlight.

[0009] Optionally, the first adhesive tape base layer, the second adhesive tape base layer, the first adhesive layer, the second adhesive layer, and the third adhesive layer are flush with each other at one end facing the outer edge of the backlight frame; the first adhesive layer, the first adhesive tape base layer, and the second adhesive layer are flush with each other on the other side away from the outer edge of the backlight frame; and the second adhesive tape base layer and the third adhesive layer are flush with each other on the other side away from the outer edge of the backlight frame.

[0010] Optionally, the first and second adhesive tape base layers are PET tapes, and the first, second, and third adhesive layers are acrylic adhesives.

[0011] Optionally, the thickness of the light-shielding composite tape is 0.1mm, and the appearance is black.

[0012] Optionally, a strip of light-shielding composite tape is affixed to each of the four edges of the backlight.

[0013] Optionally, the backlight frame is provided with a backlight receiving groove that faces the LCD screen, and the backlight source is housed in the backlight receiving groove;

[0014] On the backlight frame, an annular groove is provided on the outer edge of the backlight receiving groove. The annular groove is connected to the backlight receiving groove and is arranged with an open center facing the LCD screen and towards the backlight frame. The third adhesive layer is bonded to the bottom surface of the annular groove.

[0015] Optionally, the outer edge of the liquid crystal display and the light-shielding composite tape has a gap with the inner wall of the annular groove, and the third adhesive layer protrudes from the annular groove.

[0016] This application also proposes a bonding process for a touchscreen that reduces pressure ripples. This bonding process is used to manufacture the aforementioned touchscreen that reduces pressure ripples. The bonding process for the touchscreen that reduces pressure ripples includes the following steps:

[0017] The cover plate and the touch-screen LCD display are bonded together with an optical adhesive film to form a fully laminated semi-finished product.

[0018] The backlight is assembled into a backlight frame to form a backlight module;

[0019] The third adhesive layer of the light-shielding composite tape is bonded to the bonding area located at the four edges of the backlight frame to form a backlight module with light-shielding composite tape.

[0020] The backlight module with light-shielding composite tape is bonded to the fully laminated semi-finished product using the light-shielding composite tape to form a touch screen that can reduce water ripples when pressed.

[0021] Optionally, the light-shielding composite tape is made by the following steps:

[0022] Apply adhesive to one side of the opaque tape to form a first tape roll, and apply adhesive to both sides of the opaque tape to form a second tape roll.

[0023] The first tape roll and the second tape roll are cut into strips according to their respective preset widths, with the width of the second tape roll being smaller than that of the first tape roll.

[0024] The first strip of adhesive tape and the second strip of adhesive tape are pulled onto two rollers with a preset gap and rotating relative to each other by rotating a round shaft. Then, the first strip of adhesive tape and the second strip of adhesive tape are combined by the squeezing and rotation of the two rollers to form a composite adhesive tape roll.

[0025] The composite tape roll is cut using a die to form multiple individual light-blocking composite tapes with the required shapes.

[0026] Optionally, after cutting the composite tape roll into multiple individual shapes of light-blocking composite tape using a die, the following steps are also included:

[0027] Prepare a transparent protective film based on the shape of the backlight frame;

[0028] The light-shielding composite tape is pasted onto the protective film to form a composite tape semi-finished product. The ends of four light-shielding composite tapes are spliced ​​together to form a composite tape frame that matches the shape of the bonding area.

[0029] When using automated equipment to assemble the backlight module, pick up the semi-finished composite tape and stick the light-shielding composite tape to the bonding area of ​​the backlight frame.

[0030] The beneficial effect of the touchscreen with reduced pressure ripples provided in this application is that the display module and backlight module can be bonded together using a light-shielding composite tape. Compared to conventional light-shielding tapes used in touchscreens, the multi-layer structure design of this light-shielding composite tape adds a second tape base layer and a third adhesive layer. This absorbs the structural differences caused by local deformation of the backlight frame of the backlight module. Thus, when the fully bonded touchscreen is subjected to pressure, the light-shielding composite tape can play a certain buffering role, thereby reducing pressure ripples. In other words, this technical solution uses a multi-layer light-shielding composite tape. By increasing the adhesive thickness and the number of composite layers, the pressure exerted by the backlight frame on the touch-enabled LCD screen during backlight deformation is buffered, thereby reducing the deformation of the touchscreen. Of course, the multi-layered light-shielding composite tape is cut to form a two-layer structure with different widths and shapes. The thickness of the first tape base layer can replace the structural thickness of the backlight frame to form a supporting structure. This structural design can avoid an increase in the overall thickness of the touch screen due to the increased thickness of the light-shielding composite tape. Furthermore, the technical solution of this application mainly optimizes the structure of the tape used to bond the display module and the backlight module. It does not affect the production equipment or the overall design process, thus achieving the goal of optimizing the product's performance without significantly increasing costs. In other words, this technical solution does not involve major changes to the current screen structure, does not require special processes or equipment, and can be quickly implemented in physical production applications. Therefore, the technical solution of this application has advantages such as simple structure, low cost, and low process difficulty. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A front view of the display module of the touch screen that can reduce water ripples when pressed, as provided in the embodiments of this application;

[0033] Figure 2 A front view of the backlight module of a touchscreen that can reduce water ripples when pressed, as provided in an embodiment of this application.

[0034] Figure 3 A partial structural cross-sectional view of a touch screen that can reduce water ripples when pressed, as provided in an embodiment of this application.

[0035] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0036] Figure 5 A cross-sectional view of the light-shielding composite tape provided in the embodiments of this application;

[0037] Figure 6 A front view of the composite tape semi-finished product provided in the embodiments of this application;

[0038] Figure 7 for Figure 6 A partial sectional view of the structure along the SS direction;

[0039] Figure 8 for Figure 6 Enlarged diagram of point B in the middle.

[0040] Explanation of icon numbers:

[0041] Detailed Implementation

[0042] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0043] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0044] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this application are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0049] This application provides a touch screen that can reduce water ripples when pressed.

[0050] Please see Figures 1 to 5In one embodiment, the touchscreen that reduces water ripples when pressed includes a display module 100, a backlight module 200, and a light-shielding composite tape 300. Specifically, the display module 100 includes a cover plate 110, an optical film 120, and a touch-enabled liquid crystal display 130. The front of the liquid crystal display 130 and the cover plate 110 are fully bonded together by the optical film 120. The backlight module 200 includes a backlight source 210 and a backlight frame 220. The backlight source 210 is housed in the backlight frame 220 and stacked on the back of the liquid crystal display 130. The light-shielding composite tape 300 is disposed on the edge area of ​​the back of the liquid crystal display 130, and the backlight frame 220 and the liquid crystal display 130 are bonded together by the light-shielding composite tape 300. The light-shielding composite tape 300 includes a first tape base layer 310, a second tape base layer 320, a first adhesive layer 330, a second adhesive layer 340, and a third adhesive layer 350. The first adhesive layer 330 is disposed on the front side of the first tape base layer 310 facing the liquid crystal display screen 130 and is used to bond the liquid crystal display screen 130. The third adhesive layer 350 is disposed on the back side of the second tape base layer 320 facing the backlight frame 220 and is used to bond the backlight frame 220. The second adhesive layer 340 bonds the first tape base layer 310 and the second tape base layer 320. Both the first tape base layer 310 and the second tape base layer 320 are light-proof. The width of the second tape base layer 320 is shorter than that of the first tape base layer 310, and the area of ​​the second adhesive layer 340 exposed on the second tape base layer 320 faces the edge area of ​​the backlight source 210.

[0051] It should be noted that the touchscreen that reduces pressure ripples is mainly suitable for 8 to 12-inch flat panel displays, but other suitable display products can also apply the technical solution of this application. In this embodiment, the display module 100 of the touchscreen that reduces pressure ripples is an in-cell type touch display module 100 that is fully laminated using OCA (Optical Clear Adhesive, optical film 120).

[0052] Based on this design, in this embodiment, the display module 100 and the backlight module 200 can be bonded together using a light-shielding composite tape 300. Compared to conventional light-shielding tapes used in touchscreens, the multi-layered structure of this light-shielding composite tape 300 adds a second tape base layer 320 and a third adhesive layer 350. This absorbs the structural differences caused by local deformation of the backlight frame 220 of the backlight module 200. Thus, when the fully bonded touchscreen is subjected to pressure, the light-shielding composite tape 300 can provide a certain buffering effect, thereby reducing the water ripple effect caused by pressure. In other words, this technical solution uses a multi-layered light-shielding composite tape 300. By increasing the adhesive thickness and the number of composite layers, the pressure exerted by the backlight frame 220 on the touch-enabled liquid crystal display 130 during backlight deformation is buffered, thereby reducing the deformation of the touchscreen. Of course, the multi-layered light-shielding composite tape 300 is cut to form a two-layer structure with different widths and shapes. The thickness of the first tape base layer 310 can replace the structural thickness of the backlight frame 220 to form a supporting structure. This structural design can avoid an increase in the overall thickness of the touch screen due to the increased thickness of the light-shielding composite tape 300. In addition, the technical solution of this application mainly optimizes the structure of the tape bonding the display module 100 and the backlight module 200. It will not affect the production equipment and the overall design process, thereby achieving the goal of optimizing the product's performance without significantly increasing costs. In other words, this technical solution does not involve major changes to the current screen structure and does not require special processes or equipment, thus it can be quickly introduced into physical production applications. Therefore, the technical solution of this application has the advantages of simple structure, low cost, and low process difficulty.

[0053] Please see Figure 3 and Figure 4 In this embodiment, the first adhesive tape base layer 310, the second adhesive tape base layer 320, the first adhesive layer 330, the second adhesive layer 340, and the third adhesive layer 350 are flush with each other at one end facing the outer edge of the backlight frame 220; the first adhesive layer 330, the first adhesive tape base layer 310, and the second adhesive layer 340 are flush with each other on the other side away from the outer edge of the backlight frame 220; the second adhesive tape base layer 320 and the third adhesive layer 350 are flush with each other on the other side away from the outer edge of the backlight frame 220. It can be understood that in this embodiment, such an adhesive tape structure design facilitates the manufacture of the light-shielding composite tape 300 and allows the light-shielding composite tape 300 to form a regular stepped cross-section, thereby facilitating its bonding with the display module 100 and the backlight module 200. It also helps to further reduce the thickness of the touchscreen, which already reduces the pressure ripple effect.

[0054] In this embodiment, the first adhesive tape base layer 310 and the second adhesive tape base layer 320 are preferably PET tapes, and the first adhesive layer 330, the second adhesive layer 340, and the third adhesive layer 350 are preferably acrylic adhesives. Specifically, the light-shielding PET tape is made of a transparent polyethylene terephthalate film with black ink printed on its surface, and its thickness is preferably 20 μm; the thickness of each adhesive layer is approximately 20 μm, and the color can be, but is not limited to, transparent or black. In addition, the thickness of the light-shielding composite tape 300 is 0.1 mm, and its appearance is black. Thus, this thinner light-shielding composite tape 300 not only helps to reduce the overall thickness of the touch screen, but the black tape can also play a good role in light shielding, preventing light emitted by the backlight 210 from leaking from the peripheral connection between the display module 100 and the backlight module 200. Of course, in other embodiments, the first tape base layer 310 and the second tape base layer 320 can also be made of other suitable materials, and the first adhesive layer 330, the second adhesive layer 340 and the third adhesive layer 350 can also be made of other suitable adhesives. The size, thickness and color of each tape base layer and adhesive layer can also be set according to actual needs.

[0055] Please see Figure 3 and Figure 6 In this embodiment, a strip of light-shielding composite tape 300 is attached to each of the four edges of the backlight 210, thereby achieving full bonding between the display module 100 and the backlight module 200.

[0056] Please see Figure 3 and Figure 4 In this embodiment, the backlight frame 220 has a backlight receiving groove 221 that faces the liquid crystal display screen 130, and the backlight source 210 is housed in the backlight receiving groove 221. On the backlight frame 220, at the outer edge of the backlight receiving groove 221, an annular groove 222 is also provided. The annular groove 222 communicates with the backlight receiving groove 221 and is positioned with an opening facing the liquid crystal display screen 130 and towards the center of the backlight frame 220; the third adhesive layer 350 is bonded to the bottom surface of the annular groove 222. It can be understood that this design, where the outer edge of the liquid crystal display screen 130 is bonded to the annular groove 222 of the backlight frame 220 by the light-shielding composite tape 300, can minimize the thickness of the touch screen, thereby helping to reduce the overall thickness of the touch screen while minimizing the pressure ripple effect.

[0057] Furthermore, such as Figure 4As shown, in this embodiment, the outer edges of the liquid crystal display screen 130 and the light-shielding composite tape 300 have a gap with the inner wall of the annular groove 222, and the third adhesive layer 350 partially protrudes from the annular groove 222. This gap between the outer edges of the liquid crystal display screen 130 and the light-shielding composite tape 300 and the inner wall of the annular groove 222 facilitates the assembly of the liquid crystal display screen 130. The partial protrusion of the third adhesive layer 350 from the annular groove 222 ensures that the light-shielding composite tape 300 can be completely bonded to the bottom surface of the annular groove 222, enhancing the bonding stability.

[0058] This application also proposes a bonding process for a touchscreen that reduces pressure ripples. In this embodiment, the bonding process for a touchscreen that reduces pressure ripples is used to manufacture the aforementioned touchscreen that reduces pressure ripples. Specifically, the bonding process for a touchscreen that reduces pressure ripples includes the following steps: First, a cover plate 110 and a liquid crystal touchscreen display are bonded together using an optical adhesive film 120 to form a fully bonded semi-finished product; then, a backlight source 210 is assembled in a backlight frame 220 to form a backlight module 200; then, the third adhesive layer 350 of a light-shielding composite tape 300 is bonded to the bonding area located at the periphery of the backlight frame 220 to form a backlight module 200 with the light-shielding composite tape 300; finally, the backlight module 200 with the light-shielding composite tape 300 is bonded to the fully bonded semi-finished product using a light-shielding composite adhesive to form a touchscreen that reduces pressure ripples.

[0059] In other words, this bonding process first bonds the cover plate 110 and the touch-enabled liquid crystal display 130 together using an optical adhesive film 120 to form a fully bonded semi-finished product, and then fully bonds it to the backlight module 200 with a light-shielding composite tape 300 to obtain a touch screen that reduces water ripples when pressed. Here, since the light-shielding composite tape 300 described above is used, it possesses all the beneficial effects of the technical solution described in the preceding embodiments. Specifically, the addition of the adhesive layer improves the effect of solving the pressing water ripple phenomenon caused by the slight local warping deformation of the backlight frame 220. At the same time, since the light-shielding composite tape 300 has a structure of two layers of PET tape, namely the first tape base layer 310 and the second tape base layer 320, by cutting, the bottom PET tape, namely the first tape base layer 310, the first adhesive layer 330 and the second adhesive layer 340, can replace part of the thickness of the backlight frame 220 through the stepped clearance structure design. Therefore, the overall structural thickness of the backlight module 200 will not increase due to the thickening of the light-shielding composite tape layer.

[0060] Further, in this embodiment, the light-shielding composite tape 300 is manufactured through the following steps: First, adhesive is applied to one side of the opaque tape to form a first tape roll, and adhesive is applied to both sides of the opaque tape to form a second tape roll; then, the first and second tape rolls are cut into strips according to their respective preset widths, with the width of the second tape roll being smaller than that of the first tape roll; then, the strips of the first and second tape rolls are pulled onto two rollers with a preset gap and rotating relative to each other via a rotating shaft, and then the first and second tape rolls are combined by the compression and rotation of the two rollers to form a composite tape roll; then, the composite tape roll is cut using a die to form multiple individual light-shielding composite tapes 300 with the required shapes.

[0061] Specifically, this light-blocking composite tape 300 is composed of a single-sided coated black PET tape (a second tape base layer 320 plus a third adhesive layer 350) and a double-sided coated black PET tape (a first tape base layer 310 plus a first adhesive layer 330 and a second adhesive layer 340). During manufacturing, the first tape roll (a roll of single-sided coated black PET tape) and the second tape roll (a roll of double-sided coated black PET tape) are first cut into strips using a circular cutter. Then, they are pressed together by two rollers to form a composite tape roll. Finally, a die is used to cut it to the required shape. Here, since the thickness of the light-shielding composite tape 300 is 0.1mm, in order to ensure the extrusion and bonding effect of the rollers, the gap between the two rollers should be slightly smaller than the design thickness of the light-shielding composite tape 300, that is, the preset gap can be 0.08mm.

[0062] Furthermore, such as Figures 6 to 8 As shown, in this embodiment, after cutting the composite tape roll into multiple individual light-shielding composite tapes 300 with the required shape using a die, the following steps are also included: First, a transparent protective film 400 is prepared with reference to the shape of the backlight frame 220; then, the light-shielding composite tape 300 is pasted onto the protective film 400 to form a composite tape semi-finished product, and the ends of four light-shielding composite tapes 300 are spliced ​​together to form a composite tape frame with the same shape as the bonding area; then, when the backlight module 200 is assembled using an automatic device, the composite tape semi-finished product is picked up and the light-shielding composite tape 300 is pasted onto the bonding area of ​​the backlight frame 220.

[0063] To facilitate automated application of the backlight module 200, four strips of light-shielding composite tape 300 can be first joined end-to-end on a transparent PET protective film 400 in a predetermined shape to form a composite tape frame, thus creating a semi-finished composite tape product. Then, when the backlight module 200 is assembled on the automated equipment, this semi-finished composite tape can be picked up and applied in one go. It should also be noted that, to avoid contamination of the adhesive surface before application, which could affect the bonding effect, a release liner 500 is attached to the side of the light-shielding composite tape 300 away from the protective film 400 for easy removal and application later. Furthermore, to better adapt to the specific product conditions, the four light-shielding composite tapes 300 can also have different shapes on different sides. For example, the light-shielding composite tapes 300 on the upper, left, and right sides are narrower, while those on the lower side are wider. In order to improve the bonding strength, the width of the second tape base layer 320 of the lower light-shielding composite tape 300 is the same as that of the first tape base layer 310, and the widths of the first adhesive layer 330, the second adhesive layer 340, and the third adhesive layer 350 are also the same.

[0064] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A touchscreen that reduces water ripple effects when pressed, characterized in that, include: The display module includes a cover plate, an optical film, and a liquid crystal display screen with touch function. The front of the liquid crystal display screen and the cover plate are fully bonded together by the optical film. A backlight module includes a backlight source and a backlight frame, wherein the backlight source is housed in the backlight frame and stacked on the back of the liquid crystal display screen; as well as, A light-shielding composite tape is provided on the edge area of ​​the back of the liquid crystal display screen, and the backlight frame and the liquid crystal display screen are bonded together by the light-shielding composite tape; The light-shielding composite tape includes a first tape base layer, a second tape base layer, a first adhesive layer, a second adhesive layer, and a third adhesive layer. The first adhesive layer is disposed on the front side of the first tape base layer facing the liquid crystal display screen and is used to bond the liquid crystal display screen. The third adhesive layer is disposed on the back side of the second tape base layer facing the backlight frame and is used to bond the backlight frame. The second adhesive layer bonds the first tape base layer and the second tape base layer. Both the first tape base layer and the second tape base layer are opaque. The width of the second tape base layer is shorter than that of the first tape base layer, and the area of ​​the second adhesive layer exposed on the second tape base layer faces the edge area of ​​the backlight source.

2. The touchscreen that reduces water ripples when pressed, as described in claim 1, is characterized in that... The first adhesive tape base layer, the second adhesive tape base layer, the first adhesive layer, the second adhesive layer, and the third adhesive layer are flush with each other at one end facing the outer edge of the backlight frame; the first adhesive layer, the first adhesive tape base layer, and the second adhesive layer are flush with each other on the other side away from the outer edge of the backlight frame; the second adhesive tape base layer and the third adhesive layer are flush with each other on the other side away from the outer edge of the backlight frame.

3. The touchscreen that reduces water ripples when pressed, as described in claim 1, is characterized in that... The first and second tape base layers are PET tapes, and the first, second, and third adhesive layers are acrylic adhesives.

4. The touchscreen that reduces water ripples when pressed, as described in claim 1, is characterized in that... The light-shielding composite tape has a thickness of 0.1 mm and is black in appearance.

5. The touchscreen that reduces water ripples when pressed, as described in claim 1, is characterized in that... One strip of the light-shielding composite tape is attached to each of the four edges of the backlight.

6. The touchscreen that reduces water ripples when pressed, as described in any one of claims 1 to 5, is characterized in that, The backlight frame is provided with a backlight receiving groove facing the liquid crystal display screen, and the backlight source is housed in the backlight receiving groove; On the backlight frame, an annular groove is provided on the outer edge of the backlight receiving groove. The annular groove is connected to the backlight receiving groove and is open to the center of the liquid crystal display screen and the backlight frame. The third adhesive layer is bonded to the bottom surface of the annular groove.

7. The touchscreen that reduces water ripples when pressed, as described in claim 6, is characterized in that... The outer edges of the liquid crystal display screen and the light-shielding composite tape have gaps with the inner sidewall of the annular groove, and the third adhesive layer partially protrudes from the annular groove.

8. A bonding process for a touchscreen that reduces water ripple effects when pressed, characterized in that, The bonding process of the touch screen that can reduce pressure ripples is used to manufacture the touch screen that can reduce pressure ripples as described in any one of claims 1 to 7. The bonding process for the touchscreen that reduces water ripples when pressed includes the following steps: The cover plate and the touch-enabled liquid crystal display screen are bonded together using the optical adhesive film to form a fully laminated semi-finished product. The backlight source is assembled into the backlight frame to form the backlight module; The third adhesive layer of the light-shielding composite tape is bonded to the bonding area located at the periphery of the backlight frame to form the backlight module with the light-shielding composite tape. The backlight module with the light-shielding composite tape is bonded to the fully laminated semi-finished product using the light-shielding composite tape to form the touch screen that can reduce water ripples when pressed.

9. The bonding process for a touchscreen that reduces water ripples when pressed, as described in claim 8, is characterized in that... The light-shielding composite tape is manufactured through the following steps: Apply adhesive to one side of the opaque tape to form a first tape roll, and apply adhesive to both sides of the opaque tape to form a second tape roll. The first tape roll and the second tape roll are cut into strips according to their respective preset widths, wherein the width of the second tape roll is smaller than that of the first tape roll. The first strip of adhesive tape roll and the second strip of adhesive tape roll are pulled onto two rollers with a preset gap and rotating relative to each other by rotating a round shaft. Then, the first strip of adhesive tape roll and the second strip of adhesive tape roll are combined by the squeezing and rotation of the two rollers to form a composite adhesive tape roll. The composite tape roll is cut using a die to form multiple individual light-shielding composite tapes with the required shapes.

10. The bonding process for a touchscreen that reduces water ripples when pressed, as described in claim 9, is characterized in that... After the step of cutting the composite tape roll using a die to form multiple individual shapes of the light-shielding composite tape as required, the following steps are also included: Prepare a transparent protective film based on the shape of the backlight frame; The light-shielding composite tape is pasted onto the protective film to form a composite tape semi-finished product. The ends of four light-shielding composite tapes are spliced ​​together to form a composite tape frame with the same shape as the bonding area. When using automated equipment to assemble the backlight module, the semi-finished composite tape is picked up and the light-shielding composite tape is pasted onto the bonding area of ​​the backlight frame.

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