Display Panel Adhesive Edge Roughness for Sealing Reliability
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Solution Overview
Problem
Conventional display panels face reliability issues due to insufficient adhesion between the sealant and substrates, leading to liquid crystal leakage and moisture ingress.
Innovation Solution
The display panel incorporates a shading layer with a first contact surface and an adhesive agent having second contact surfaces with increased line edge roughness, enhancing the contact length and adhesive capability between the substrates, and optionally includes embossed patterns, bubbles, and grooves to further improve adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is applied to the periphery of the TFT substrate to enclose liquid crystals, then the liquid crystals can be contained within the display panel, but the adhesion between the sealant and substrates is insufficient causing liquid crystal leakage and moisture ingress
Solution Approach 1:
The patent applies different surface roughness characteristics to different regions of the adhesive agent. The second edge near the active area has greater line edge roughness to enhance adhesion in the critical sealing region, while other regions maintain standard characteristics. This local differentiation of surface properties optimizes adhesion strength where it is most needed without unnecessarily complicating the entire structure.
Solution Approach 2:
The patent transitions from considering only the planar dimensions of the sealant to incorporating the third dimension of surface roughness. By increasing the line edge roughness of the second edge, the patent effectively increases the contact length and surface area for adhesion in the critical region, adding a dimensional aspect to the sealing structure that enhances bonding strength.
2Ease of manufacture
If the adhesive agent has smooth edges for easy manufacturing, then the manufacturing process is simplified, but the adhesion strength between the adhesive agent and substrates is reduced
Solution Approach 1:
The patent implements local quality by applying increased surface roughness only to the second edge near the active area, while other edges maintain standard smooth characteristics. This allows the critical sealing region to have enhanced adhesion properties without requiring all edges to be manufactured with complex rough surfaces, thus balancing manufacturing ease with adhesion strength requirements.
Solution Approach 2:
The patent applies partial action by enhancing the roughness of only the second edge (the critical sealing edge) rather than all edges of the adhesive agent. This partial enhancement provides sufficient adhesion improvement in the most critical region without the need to manufacture all edges with enhanced roughness, thereby maintaining relative manufacturing simplicity while achieving the required adhesion strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly enhances the adhesion strength between the adhesive agent and substrates, minimizing liquid crystal leakage and external moisture ingress, thereby improving the overall reliability of the display panel.
Implementation Method 1
the adhesive agent includes two second contact surfaces respectively facing the first substrate and the second substrate, one of the second surfaces has a second edge near the active area, and the line edge roughness of the second edge is greater than that of the first edge
Data Source
AI summary
A display panel includes an active area and a peripheral area surrounding the active area, and includes first and second substrates, a shading layer and an adhesive agent. The second substrate is disposed opposite the first substrate. The shading layer is disposed on the first substrate and corresponds to the peripheral area. The shading layer includes a first contact surface contacting with the first substrate, the first contact surface has a first edge. The adhesive agent is disposed between the first substrate and the second substrate and corresponds to the shading layer. The adhesive agent includes two second contact surfaces respectively facing the first substrate and the second substrate, one of the second surfaces has a second edge near the active area, and the line edge roughness of the second edge is greater than that of the first edge.