LCD Panel Sealant Alignment Marks for Line Width Control
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Solution Overview
Problem
The precision application of frame sealant in liquid crystal display (LCD) panel manufacturing is challenging due to equipment precision deviations, leading to non-uniform line widths, which can result in liquid crystal molecule leakage or contamination, affecting the uniformity and quality of the LCD panel.
Innovation Solution
The introduction of mark regions with parallel aligning marks and scales on the thin film transistor substrate allows for controlled application of frame sealant, ensuring precise alignment and line width, thereby maintaining the correct distance between substrates and preventing leakage or contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the frame sealant is applied directly onto the mark regions without aligning marks, then the application process is simpler, but the line width precision and uniformity deteriorate due to equipment precision deviations
Solution Approach 1:
The patent introduces aligning marks (such as cross marks or T-shaped marks) that are pre-formed on the substrate before frame sealant application. These marks serve as reference features that enable the application equipment to precisely position and align the frame sealant, thereby compensating for equipment precision deviations and achieving uniform line width without complicating the overall application process
2Reliability
If the frame sealant line width is made thinner to prevent liquid crystal leakage, then the risk of liquid crystal leakage decreases, but the uniformity of substrate distance deteriorates due to precision deviations
Solution Approach 1:
The patent replaces reliance on mechanical equipment precision with an optical/visual alignment system. By providing clearly visible aligning marks on the substrate, the system enables precise positioning of the frame sealant through visual or optical detection rather than depending solely on mechanical positioning accuracy, thereby achieving both thin uniform line width and consistent substrate spacing
3Reliability
If the frame sealant line width is made thicker to ensure adequate sealing, then the sealing reliability improves, but the risk of liquid crystal contamination increases due to position deviation
Solution Approach 1:
The aligning marks serve as feedback references that enable real-time or pre-positioned alignment verification. By detecting the position of these marks, the application process can adjust or ensure proper positioning of the frame sealant, allowing adequate line width for reliable sealing while preventing position deviations that would cause liquid crystal contamination
Data Source
AI summary
A liquid crystal display panel includes a color filter, a thin film transistor substrate in opposition to the color filter, a liquid crystal layer provided between the color filter and the thin film transistor substrate and a sealant provided corresponding to the mark regions and surrounding the liquid crystal layer. The mark regions are provided on periphery of the thin film transistor substrate and each includes a plurality of alignment marks as references for applying the frame sealant and therefore controlling the applying amount and rate of the frame sealant so that the applied frame sealant has line width of desired specification and that the distance between the substrates is desirably determined. A related method for manufacturing a liquid crystal display panel is also provided.