Frame structure of video display panel and protective cover plate

Abstract

To provide a frame bonding structure for a video display panel and a protective cover plate, which prevents optical interference (Newton's rings) and lamination deformation caused by air pressure differences in the internal space when the video display panel and the protective cover plate are bonded to a frame, and can suppress deterioration of visibility and contamination. [Solution] A square-shaped double-sided tape 2 is interposed between an electronic display module 1 and a protective cover plate 3, and the four peripheries are fixed with adhesive. The frame strip 21 of the square-shaped double-sided tape 2 has an air passage 22 that penetrates both the inside and outside of the module. The air passage has an inner diameter of 0.5 mm or less and further includes at least one bend. This automatically balances the internal and external air pressures, preventing optical interference, and the bend in the air passage prevents moisture and dust from entering from the outside, preventing contamination of the image display panel 1A. This structure allows for easy lamination, a high yield, and a display module with excellent optical quality and environmental resistance.

Description

[Technical Field]

[0001] The present invention relates to an assembly structure for an electronic display module, and more particularly to a frame structure for attaching a display panel and a protective cover plate. [Background technology]

[0002] Display panels installed in portable electronic devices are susceptible to damage from collisions and scratches during use, so a protective cover plate (cover lens) is attached to the surface of the display panel. A typical protective cover plate attachment method involves applying an adhesive layer to the surface of the electronic display module and then applying pressure to the protective cover plate to form a full-surface lamination structure. While this full-surface lamination structure offers advantages such as high bonding strength, it requires a high level of lamination technology and therefore has a relatively low yield rate. If poor lamination, OCR adhesive leakage, or uneven UV curing occurs during the lamination process, rework is not possible, resulting in the loss or disposal of the electronic display module and protective cover plate, thereby increasing production costs. Furthermore, since the components of electronic display modules are expensive, any damage during lamination can result in significant losses. In particular, as display sizes have become larger in recent years, lamination has become increasingly difficult, exacerbating the drawbacks of the full-surface lamination method.

[0003] To address the shortcomings of the conventional full-surface lamination method, improve product yields, and reduce production costs, an improved frame-type lamination method has been proposed. In this method, a square-shaped double-sided tape is used to adhesively secure the four edges of the display panel and protective cover plate of an electronic display module. After frame lamination, a space is formed between the inside of the frame strips of the square-shaped double-sided tape and between the display panel and protective cover plate, creating an enclosed space that is isolated from the outside. Under normal conditions, the top surface of the display panel is kept parallel to the bottom surface of the protective cover plate, and images on the display panel are displayed normally through this space and the protective cover plate. However, when exposed to temperature changes or external forces, such as pressure on the protective cover plate or changes in external air pressure during air transport, the air in the space can be strongly compressed or expelled, causing an imbalance in the air pressure inside and outside the space. This not only risks damaging the laminated structure, but also warping and deformation of the laminated structure, making it impossible to maintain parallelism between the top surface of the image display panel and the bottom surface of the protective cover plate. As a result, optical interference fringes (Newton's rings) occur when the image light from the image display panel passes through the space, significantly impairing the display quality of the image display panel. Summary of the Invention

[0004] To overcome the drawbacks of conventional frame lamination methods, the present invention aims to provide an improved frame lamination structure for a display panel and a protective cover plate. The frame lamination structure of the present invention provides an air passage in the internal space formed by the frame lamination, automatically equalizing the internal and external air pressures, preventing optical interference and ensuring good visibility of the display panel. Furthermore, the air passage is provided with a bent section to increase its length, capturing moisture and fine dust particles that enter from the outside and preventing contamination of the display panel.

[0005] To achieve the above object, the present invention provides a frame bonding structure for an image display panel and a protective cover plate, which includes an electronic display module, a rectangular double-sided tape, and a protective cover plate. The rectangular double-sided tape is disposed between the electronic display module and the protective cover plate, adhesively fixing the four sides of the two together. The inner edge of the rectangular double-sided tape is aligned with the outer edge of the image display panel of the electronic display module. At least one air passage is provided on the frame strip of the double-sided tape, the air passage passing through both the inside and outside of the frame strip, and the air passage includes at least one bent portion.

[0006] The inner diameter of the air passage is 0.5 mm or less. Preferably, the inner diameter of part or all of the air passage is in the range of 0.2 μm to 10 μm.

[0007] The electronic display module may be selected from an electronic paper module (ePaper / E Ink), a liquid crystal display module (LCD module), an organic light emitting diode module (OLED module), and a light emitting diode display module (LED module), but the scope of implementation is not limited to these types.

[0008] The material of the protective cover plate is selected from glass, polymethyl methacrylate (PMMA), polycarbonate (PC), polyester (PET), cycloolefin copolymer (COC), and cycloolefin polymer (COP), but the scope of implementation is not limited to these materials. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic three-dimensional view of components according to the embodiment separated from each other. [Figure 2] 1 is a schematic cross-sectional side view of an assembled component according to an embodiment of the present invention. [Figure 3] 2. FIG. 3 is a partially enlarged view of part C in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in more detail below with reference to the accompanying drawings and specific examples. The examples shown are intended to enable those skilled in the art to better understand and practice the technical contents of the present invention, and are not intended to limit the present invention. In order to facilitate a clearer description and understanding of the technical features, the depictions of the various parts in the drawings are not drawn according to relative dimensions, and some dimensions are exaggerated relative to other elements. In addition, irrelevant details are omitted to maintain the simplicity of the drawings.

[0011] As shown in FIGS. 1 to 3, the frame bonding structure of the image display panel and the protective cover plate according to the preferred embodiment of the present invention mainly comprises an electronic display module 1, a square-shaped double-sided tape 2, and a protective cover plate 3.

[0012] In this embodiment, the electronic display module 1 is a low-power reflective display device that uses an electrophoretic or cholesteric liquid crystal method to display a video signal as an image on a video display panel 1A provided in front of the electronic display module 1.

[0013] The protective cover plate 3 is a thin plate having excellent mechanical strength and high light transmittance, and is made of a material such as glass, polymethyl methacrylate (PMMA), polycarbonate (PC), polyester (PET), cycloolefin copolymer (COC), or cycloolefin polymer (COP). Furthermore, a decorative frame 31 is provided on the peripheral edge of the lower surface of the protective cover plate 3. The decorative frame 31 is an opaque or low-light-transmittance thin film layer made of a non-conductive material, and is a low-light-transmittance thin film layer formed by printing or coating on the peripheral edge of the lower surface of the protective cover plate 3 using, for example, ink or a photoresist material. This decorative frame 31 serves to shield irregular patterns, wiring, or structures located below, thereby improving the aesthetic appearance.

[0014] The size of the inner frame area 2A surrounded by the four frame strips 21 of the square-shaped double-sided tape 2 is approximately equal to the area of ​​the image display panel 1A of the electronic display module 1.

[0015] An air passage 22 is provided on the frame strip 21 of the square-shaped double-sided tape, and the air passage 22 penetrates both the inside and outside of the frame strip 21. Furthermore, a bent portion 22A is provided on the air passage 22, which increases the length of the air passage.

[0016] 1 to 3, the square-shaped double-sided tape 2 is disposed between the electronic display module 1 and the protective cover plate 3. As a result, the inner edges of the frame strips 21 of the square-shaped double-sided tape are aligned and attached to the outer edges of the image display panel 1A of the electronic display module 1, and are also aligned and attached to the inner frame edge of the decorative frame 31 of the protective cover plate 3.

[0017] The electronic display module 1 and the protective cover plate 3 are attached to each other at their four sides by the double-sided tape 2 . The present invention has the advantages of rapid lamination, easy operation, reworkability, high yield, and reduced production costs. After the frame is attached, an internal space 4 is formed within the area surrounded by the frame strips 21 of the double-sided tape 2 and between the upper surface of the image display panel 1A and the lower surface of the protective cover plate 3.

[0018] The internal space 4 communicates with the outside via the ventilation path 22 and has the function of automatically equalizing the internal and external air pressures, thereby preventing warpage and deformation of the laminated structure after lamination, suppressing the occurrence of optical interference, and preventing impairment of the visibility of the image on the image display panel 1A.

[0019] Furthermore, the structure of the bent portion 22A provided in the ventilation path 22 doubles the length of the ventilation path 22, and when ventilation is performed between the internal space 4 and the outside, impurities such as moisture and fine dust from the outside are more likely to remain in the ventilation path 22, preventing these impurities from easily entering the internal space 4 and contaminating the image display panel 1A.

[0020] In this embodiment, the inner diameter of the air passage 22 is set to 0.5 mm or less to ensure a balance between ventilation performance and dust prevention performance.

[0021] In another preferred embodiment, the inner diameter of part or all of the air passage 22 is set in the range of 0.2 μm to 10 μm, thereby achieving an anti-fouling effect that completely blocks moisture and fine dust while allowing ventilation.

[0022] The above-described embodiments are merely preferred embodiments shown to fully explain the present invention, and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make various equivalent substitutions, modifications, or appropriate combinations of the features and configurations of each embodiment based on the disclosure of the present invention, all of which are within the scope of the technical idea of ​​the present invention. [Explanation of symbols]

[0023] 1: Electronic display module 1A: Video display panel 2: Double-sided tape 2A: Inner frame area range 21: Frame 22: Air passage 22A: Bend section 3: Protective cover plate 31: Decorative Border 4: Interior space

Claims

1. A frame bonding structure of a video display panel and a protective cover plate, It includes an electronic display module, a double-sided tape, and a protective cover plate. the square-shaped double-sided tape is disposed between the electronic display module and the protective cover plate, adhesively joining the four peripheries of the two, and the inner edge of the frame strip of the square-shaped double-sided tape is aligned with the outer edge of the image display panel of the electronic display module; At least one air passage is provided on the frame strip of the double-sided tape, the air passage penetrates both the inside and outside of the frame strip, the inner diameter of the air passage is 0.5 mm or less, and the air passage further includes at least one bent portion.

2. 2. The frame structure of a video display panel and a protective cover plate according to claim 1, wherein the inner diameter of the air passage is in the range of 0.2 μm to 10 μm in part or all of the air passage.

3. 2. The frame bonding structure of a video display panel and a protective cover plate according to claim 1, wherein the electronic display module is any one of an electronic paper module, a liquid crystal display module, an organic light emitting diode module, and a light emitting diode display module.

4. 2. The frame-bonded structure of a video display panel and a protective cover plate according to claim 1, characterized in that the material of the protective cover plate is any one of glass, polymethyl methacrylate (PMMA), polycarbonate (PC), polyester (PET), cycloolefin copolymer (COC), and cycloolefin polymer (COP).

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