Liquid crystal display panel with reinforced sealant structure

Abstract

The utility model relates to liquid crystal display panel technical field, specifically disclose a liquid crystal display panel with reinforced frame sealant structure, including upper glass substrate, lower glass substrate, liquid crystal layer and annular frame sealant, annular frame sealant is enclosed in liquid crystal layer outside, for fixing upper and lower substrate and sealing liquid crystal layer, the side of upper glass substrate near the edge is equipped with the stepped recess, the stepped recess is continuously enclosed and presents closed annular along its four edges, the position of lower glass substrate corresponding stepped recess is equipped with the stepped terrace matched with it, the stepped terrace presents closed annular, the stepped terrace and stepped recess present concave-convex cooperation's occlusion structure, the stepped recess and the stepped terrace all include two levels of steps, each level of steps forms complete closed loop, and the stepped terrace and the stepped recess are reserved radial clearance and axial clearance between. The utility model discloses through closed annular multistage stepped occlusion and double clearance design, and the anchoring force, sealing stability and anti failure ability of reinforced frame sealant structure.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display panel technology, and specifically to a liquid crystal display panel with a reinforced sealing adhesive structure. Background Technology

[0002] As a mainstream display device, liquid crystal display (LCD) is widely used in mobile phones, televisions, automotive displays and other scenarios. Its core structure includes a square (or rectangular) upper glass substrate, a square (or rectangular) lower glass substrate, a liquid crystal layer and an annular sealing adhesive. The core function of the sealing adhesive is to fix the upper and lower substrates and seal the liquid crystal layer to prevent liquid crystal leakage and moisture intrusion.

[0003] In existing technologies, the sealing adhesive structure mostly adopts a single groove or planar bonding design, which has the following defects: 1. Insufficient mechanical anchoring force. The bonding between the sealing adhesive and the substrate mainly relies on chemical bonding. Under long-term use or when affected by temperature changes or mechanical stress, the adhesive layer is prone to peeling. 2. The problem of stress concentration is prominent. The difference in the coefficient of thermal expansion between the upper and lower substrates and the sealing adhesive is large. During temperature cycling, stress concentration is prone to occur at the interface and substrate corners, leading to cracking of the adhesive layer. 3. Some reinforcement solutions are complex in structure and expensive, making them difficult to be compatible with existing production lines. Therefore, they cannot meet the needs of production and use. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a liquid crystal display panel with a reinforced sealing adhesive structure. Through a closed-loop multi-stage stepped interlocking and double-gap design, the anchoring force, sealing stability, and failure resistance of the sealing adhesive structure are enhanced, solving the problems of weak anchoring force, insufficient sealing stability, and stress concentration that exist in existing sealing adhesive structures.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A liquid crystal display panel with a reinforced sealing adhesive structure includes an upper glass substrate, a lower glass substrate, a liquid crystal layer, and an annular sealing adhesive. The annular sealing adhesive surrounds the outside of the liquid crystal layer and is used to fix the upper and lower substrates and seal the liquid crystal layer. The upper glass substrate has a stepped groove on one side near the edge, and the stepped groove is continuously enclosed in a closed ring along its four sides. The lower glass substrate has a matching stepped step at the position of the stepped groove, and the stepped step is in a closed ring. The stepped step and the stepped groove have a convex-concave interlocking structure. Both the stepped groove and the stepped step include at least two steps, and each step forms a complete closed ring. Radial gaps and axial gaps are reserved between the stepped step and the stepped groove.

[0007] Preferably, the side of the stepped step facing the stepped groove is provided with several micro-serrations.

[0008] Preferably, the inner wall edge of the stepped groove and the outer wall edge of the stepped step are both chamfered, and the four corners of the upper glass substrate and the lower glass substrate are all rounded. The chamfer extends to the radial gap area and smoothly transitions with the rounded corner.

[0009] Preferably, each step of the stepped groove is provided with micro-guide grooves distributed along a closed ring on the step surface.

[0010] Preferably, the side surface of the stepped steps is provided with an elastic buffer layer.

[0011] Preferably, the elastic buffer layer is methyl vinyl silicone rubber.

[0012] The beneficial effects of this invention are as follows: the stepped grooves on the upper glass substrate and the stepped steps on the lower glass substrate form a concave-convex interlocking structure, with at least two steps being complete closed loops. This significantly improves the mechanical anchoring force between the sealant and the substrate, breaking through the limitations of traditional single chemical bonding and effectively preventing adhesive peeling caused by long-term use or temperature and mechanical stress. The reserved radial and axial gaps can buffer the difference in thermal expansion coefficients between the upper and lower substrates and the sealant, significantly alleviating stress concentration at the interface and substrate corners during temperature cycling and preventing adhesive cracking. The closed-loop stepped enclosure ensures continuous sealing, and the simple structure requires no complex additional devices, is compatible with existing production lines, and meets production and usage requirements. Attached Figure Description

[0013] Figure 1 This is an exploded structural diagram of an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the upper glass substrate structure in an embodiment of the present invention, viewed from below.

[0015] Figure 3 This is a partial cross-sectional view of the stepped steps and stepped grooves according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached diagram: 10-Upper glass substrate, 11-Stepped groove, 12-Micro guide groove, 20-Lower glass substrate, 21-Stepped step, 22-Micro serrations, 30-Liquid crystal layer, 40-Annular sealing adhesive. Detailed Implementation

[0017] To more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments:

[0018] This embodiment: as follows Figure 1-3As shown, a liquid crystal display panel with a reinforced sealing adhesive structure includes an upper glass substrate 10, a lower glass substrate 20, a liquid crystal layer 30, and an annular sealing adhesive 40. The annular sealing adhesive 40 surrounds the outside of the liquid crystal layer 30 and is used to fix the upper and lower substrates and seal the liquid crystal layer 30.

[0019] The upper glass substrate 10 has a stepped groove 11 near its edge. The stepped groove 11 is continuously enclosed in a closed ring along its four sides. The lower glass substrate 20 has a matching stepped step 21 at the position of the stepped groove 11. The stepped step 21 is a closed ring. The stepped step 21 and the stepped groove 11 have a convex-concave interlocking structure. The stepped groove 11 of the upper glass substrate 10 and the matching stepped step 21 of the lower glass substrate 20 form a convex-concave interlocking structure. At least two steps are complete closed rings, which greatly improves the mechanical anchoring force between the sealant and the substrate, breaks through the limitations of traditional single chemical bonding, and effectively avoids the peeling of the adhesive layer caused by long-term use or temperature and mechanical stress.

[0020] The stepped step 21 has several micro-serrations 22 on the side facing the stepped groove 11. The micro-serrations 22 have a height of 1-2μm, a tooth pitch of 3-5μm, and a triangular tooth shape. Each step of the stepped groove 11 has micro-guide grooves 12 distributed in a closed ring on the step surface. The micro-guide grooves 12 have a width of 2-3μm, a depth of 1-2μm, and a spacing of 5-8μm between adjacent micro-guide grooves 12. The two work together to form micro-protrusions and depressions, increasing the contact area between the sealant and the substrate and improving the sealing stability.

[0021] Both the stepped groove 11 and the stepped step 21 include two steps, each step forming a complete closed loop. Radial and axial gaps are reserved between the stepped step 21 and the stepped groove 11. The single-stage radial gap is 1-2μm, the total radial gap of the two stages is 3-6μm, and the axial gap is 0.5-1μm. The reserved radial and axial gaps can buffer the difference in thermal expansion coefficients between the upper and lower substrates and the sealing adhesive, significantly alleviate the stress concentration at the interface and substrate corners during temperature cycling, prevent the adhesive layer from cracking, meet the capillary filling requirements of the sealing adhesive, and provide space for the curing shrinkage of the sealing adhesive, reduce curing stress, and avoid the adhesive layer cracking.

[0022] The inner wall edge of the stepped groove 11 and the outer wall edge of the stepped step 21 are both chamfered. The four corners of the upper glass substrate 10 and the lower glass substrate 20 are all rounded. The chamfer extends to the radial gap area and smoothly transitions with the rounded corner. This can disperse stress peaks, prevent substrate cracking or adhesive layer cracking, guide the sealant to flow smoothly, improve the filling rate, effectively eliminate bubbles or unfilled areas caused by right-angle dead corners, and reduce leakage rate.

[0023] The side surface of the stepped step 21 is provided with an elastic buffer layer. The elastic buffer layer is made of methyl vinyl silicone rubber with a thickness of 0.1-0.3mm and is fixed by a coating process. This elastic buffer layer can work for a long time from -70℃ to 200℃, and is suitable for a wide temperature range of -40℃ to 125℃. It covers complex environments such as automotive and outdoor displays, and has excellent aging resistance and ozone resistance. With the double gap design, it can effectively compensate for the thermal expansion difference between the upper glass substrate 10, the lower glass substrate 20 and the sealing glue, so that the product can still maintain its sealing performance after damp heat aging and extend its service life. At the same time, its high elasticity can absorb mechanical vibration energy, and for large-size display panels, it can also suppress film oscillation, avoid image ripples or alternating bright and dark areas, and improve visual stability.

[0024] It should be noted that the two-stage stepped structure of the upper glass substrate 10 and the lower glass substrate 20 in this liquid crystal display panel is formed in one step by femtosecond laser, which is compatible with existing substrate processing production lines and requires no additional equipment investment. Subsequent processes such as single-frame adhesive coating and substrate alignment are fully compatible with traditional production processes and do not require adjustment of process parameters, thus greatly reducing the threshold for industrialization.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A liquid crystal display panel with a reinforced sealing adhesive structure, comprising an upper glass substrate, a lower glass substrate, a liquid crystal layer, and an annular sealing adhesive, wherein the annular sealing adhesive surrounds the outer side of the liquid crystal layer for fixing the upper and lower substrates and sealing the liquid crystal layer, characterized in that: The upper glass substrate has a stepped groove on one side near the edge. The stepped groove is continuously enclosed in a closed ring along its four sides. The lower glass substrate has a matching stepped step at the position of the stepped groove. The stepped step is a closed ring. The stepped step and the stepped groove have a convex-concave interlocking structure. Both the stepped groove and the stepped step include at least two steps. Each step forms a complete closed ring. Radial and axial gaps are reserved between the stepped step and the stepped groove.

2. A liquid crystal display panel with a reinforced sealing adhesive structure according to claim 1, characterized in that: The side of the stepped step facing the stepped groove has several micro-serrations.

3. A liquid crystal display panel with a reinforced sealing frame structure according to claim 1, characterized in that: The inner edge of the stepped groove and the outer edge of the stepped step are both chamfered, and the four corners of the upper and lower glass substrates are rounded. The chamfer extends to the radial gap area and smoothly transitions with the rounded corner.

4. A liquid crystal display panel with a reinforced sealing frame structure according to any one of claims 1-3, characterized in that: Each step of the stepped groove is provided with micro-guide grooves distributed along a closed ring on the step surface.

5. A liquid crystal display panel with a reinforced sealing adhesive structure according to any one of claims 1-3, characterized in that: The side surfaces of the stepped steps are provided with an elastic buffer layer.

6. A liquid crystal display panel with a reinforced sealing frame structure according to claim 5, characterized in that: The elastic buffer layer is made of methyl vinyl silicone rubber.

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