Frame bonding structure of image display screen and protective cover plate

Abstract

A frame bonding structure of an image display screen and a protective cover plate includes an electronic display module, a double-sided adhesive tape and a protective cover plate. The double-sided adhesive tape is arranged between the electronic display module and the protective cover plate to bond the four peripheral edges of the two together, and the inner frame edge of the double-sided adhesive tape is cut flush with the outer edge of the image display screen of the electronic display module. The frame strip of the double-sided adhesive tape is provided with at least one air passage. The air passage penetrates the inner and outer sides of the frame strip. The pipeline inner diameter of the air passage is less than 0.5 mm. The air passage includes at least one bending part. The internal space formed by the frame bonding combination can automatically adjust the internal and external air pressure balance to avoid the optical interference phenomenon to reduce the viewability of the image display screen. The bending part can increase the length of the air passage to retain the water vapor and small dust from the outside to prevent the image display screen from being contaminated.

Description

Technical Field

[0001] This utility model relates to the assembly structure of electronic display modules, and in particular to a frame-attach structure for an image display screen and a protective cover. Background Technology

[0002] The image display screens on portable electronic devices are easily damaged by impacts and scratches during use. Therefore, a protective cover is installed on the image display screen. The common method of installing the protective cover is to apply an adhesive layer to the surface of the electronic display module and press it together with the protective cover to form a fully planar bonding structure. Although this fully planar bonding structure has advantages such as high joint strength, the bonding technology is difficult, so the yield rate is relatively low. If bonding defects, OCR adhesive leakage, or uneven UV curing occur during the bonding process, rework is not possible, resulting in damage or scrap of the electronic display module and the protective cover, which leads to an increase in production and processing costs. Moreover, the components of the electronic display module are expensive, and if they are damaged during the bonding process, the losses will be enormous. In particular, the larger the size now is, the more difficult the bonding process becomes, and the disadvantages of the fully planar bonding method become more and more serious.

[0003] To address the shortcomings of traditional full-coverage bonding methods, improve product yield, and reduce production costs, an improved frame-type bonding method has been proposed. This method uses U-shaped double-sided adhesive to bond and fix the image display screen of the electronic display module to the four sides of the protective cover plate. After the frame-bonding assembly, a space is formed within the frame of the U-shaped double-sided adhesive and between the image display screen and the protective cover plate. This space is a sealed space isolated from the outside environment. Under normal conditions, the upper surface of the image display screen is parallel to the lower surface of the protective cover plate, allowing the image on the image display screen to pass through. The display space and protective cover function normally; however, when subjected to temperature changes or external forces, such as pressure on the protective cover or changes in external air pressure during product air transport, the air inside the space is forcefully squeezed out, causing an imbalance in air pressure inside and outside the space. This not only risks damage to the bonding structure but may also cause warping and deformation of the laminated structure. The upper surface of the image display screen and the lower surface of the protective cover cannot maintain a parallel state. Therefore, when the image light from the image display screen is transmitted through this space, it will cause optical interference fringes (Newton's rings) and severely damage the image display screen. Utility Model Content

[0004] To overcome the shortcomings of traditional frame-mounting processes, the purpose of this utility model is to provide an improved frame-mounting structure for an image display screen and a protective cover. The internal space formed by the frame-mounting is equipped with a ventilation channel that can automatically adjust and balance the internal and external air pressure, avoiding optical interference phenomena that reduce the visibility of the image display screen. Furthermore, the ventilation channel is provided with a curved section to increase its length, so as to trap moisture and fine dust from the outside, preventing the image display screen from being contaminated.

[0005] To achieve the above objectives, the present invention provides a frame-attach structure for an image display screen and a protective cover, comprising an electronic display module, a U-shaped double-sided adhesive, and a protective cover. The U-shaped double-sided adhesive is disposed between the electronic display module and the protective cover, bonding the four perimeters of the two together, and the inner edge of the U-shaped double-sided adhesive is flush with the outer edge of the image display screen of the electronic display module. The frame of the U-shaped double-sided adhesive is provided with at least one ventilation channel, which extends through the inner and outer sides of the frame and includes at least one curved portion.

[0006] The inner diameter of the ventilation duct is less than 0.5 mm; preferably, a portion or all of the inner diameter of the ventilation duct is between 0.2 μm and 10 μm.

[0007] The electronic display module is selected from one of the following: electronic paper module (ePaper / E Ink), liquid crystal display module (LCD Module), organic light-emitting diode module (OLED Module), and light-emitting diode display module (LED Module), but the scope of implementation is not limited to the aforementioned types.

[0008] The material of the protective cover is selected from one of glass, polymethyl methacrylate (PMMA), polycarbonate (PC), polyester (PET), cyclic olefin copolymer (COC), and cyclic olefin polymer (COP), but the scope of implementation is not limited to the aforementioned materials. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram showing the separation of components in an embodiment.

[0010] Figure 2 This is a side cross-sectional view of the component assembly in the embodiment.

[0011] Figure 3 for Figure 2 A magnified view of part C.

[0012] Explanation of markings in the diagram: 1: Electronic display module; 1A: Image display screen; 2: Square-shaped double-sided tape; 2A: Inner frame area range; 21: Frame strip; 22: Airway; 22A: Bend; 3: Protective cover plate; 31: Decorative border; 4: Interior space. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. In order to provide a clearer description and make it easier to understand the technical features of the present invention, the parts in the drawings are not drawn according to their relative dimensions, and some dimensions have been exaggerated compared with other related dimensions; irrelevant details are also not fully drawn in order to simplify the drawings.

[0014] like Figures 1 to 3 This invention shows a preferred embodiment of the present invention. The frame-attach structure of the image display screen and the protective cover mainly includes: an electronic display module 1, a square-shaped double-sided adhesive 2, and a protective cover 3.

[0015] In this embodiment, the electronic display module 1 is a reflective display with low power consumption, which uses electrophoretic technology or cholesteric liquid crystal technology to present image signals as images on the image display screen 1A on the front of the electronic display module 1.

[0016] The protective cover 3 is a thin plate with excellent mechanical strength and high light transmittance, such as glass, polymethyl methacrylate, polycarbonate, polyester, cyclic olefin copolymer, or cyclic olefin polymer. In addition, a decorative frame 31 is provided around the perimeter of the bottom surface of the protective cover 3. The decorative frame 31 is an opaque or low light transmittance film layer made of non-conductive material, such as a low light transmittance film layer formed by printing or coating ink or photoresist on the periphery of the bottom surface of the protective cover 3. The decorative frame 31 is used to cover irregular patterns, lines, or structures below to beautify the surface appearance.

[0017] The inner frame area 2A defined by the four frame strips 21 of the U-shaped double-sided tape 2 is approximately equal in size to the image display screen 1A of the aforementioned electronic display module. Ventilation channels 22 are provided on the frame strips 21 of the U-shaped double-sided tape. The ventilation channels 22 can pass through the inner and outer sides of the frame strips 21. Furthermore, the ventilation channels 22 are provided with curved portions 22A to increase the length of the ventilation channels.

[0018] like Figures 1 to 3As shown, the U-shaped double-sided adhesive 2 is placed between the electronic display module 1 and the protective cover plate 3, so that the inner edge of the frame strip 21 of the U-shaped double-sided adhesive is flush with the outer edge of the image display screen 1A of the electronic display module and the inner edge of the decorative frame 31 of the protective cover plate. The U-shaped double-sided adhesive 2 is used to bond the electronic display module 1 and the protective cover plate 3 together on all four sides. This utility model has the advantages of fast bonding process, simple operation, reworkability, high yield of finished products, and reduced production costs. After the frame is bonded together, within the range of the frame strip 21 of the U-shaped double-sided adhesive and on the upper surface of the image display screen 1A, The inner space 4 is defined by the surface of the cover plate 3 and the lower surface of the protective cover plate 3. The inner space 4 is connected to the outside through the ventilation channel 22, which can automatically adjust and balance the internal and external air pressure. This avoids warping and deformation of the laminated structure after bonding, which would cause optical interference and reduce the visibility of the image on the image display screen 1A. In addition, the curved part 22A structure on the ventilation channel 22 can double the length of the ventilation channel 22. When the inner space 4 exchanges air with the outside, it allows moisture, fine dust and other impurities from the outside to stay in the ventilation channel 22 as much as possible, preventing impurities from easily entering the inner space 4 and contaminating the image display screen 1A. In this embodiment, the inner diameter of the ventilation duct 22 is set to less than 0.5 mm to balance ventilation efficiency and prevent easy contamination by dust. In other preferred embodiments, a portion or all of the inner diameter of the ventilation duct 22 can be set between 0.2 μm and 10 μm to achieve a pollution-proof effect that allows air to pass through while completely blocking moisture and fine dust.

[0019] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model, or reasonable combinations of features and solutions from various embodiments, are all within the protection scope of the present utility model.

Claims

1. A frame-attach structure for an image display screen and a protective cover, comprising an electronic display module, a U-shaped double-sided adhesive, and a protective cover, wherein the U-shaped double-sided adhesive is disposed between the electronic display module and the protective cover, bonding their four perimeters together, and the inner edge of the frame strip of the U-shaped double-sided adhesive is flush with the outer edge of the image display screen of the electronic display module, characterized in that... The frame of the square-shaped double-sided adhesive tape has at least one ventilation channel, which runs through the inner and outer sides of the frame. The inner diameter of the ventilation channel is less than 0.5 mm, and the ventilation channel includes at least one bend.

2. The frame-attach structure of the image display screen and protective cover as described in claim 1, characterized in that, The inner diameter of part or all of the ventilator is between 0.2 μm and 10 μm.

3. The frame-attach structure of the image display screen and protective cover as described in claim 1, characterized in that, The electronic display module is selected from electronic paper modules, liquid crystal display modules, organic light-emitting diode modules, or light-emitting diode display modules.

4. The frame-attach structure of the image display screen and protective cover as described in claim 1, characterized in that, The material of the protective cover is selected from glass, polymethyl methacrylate, polycarbonate, polyester, cyclic olefin copolymer or cyclic olefin polymer.

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