Liquid Crystal Display Seal Line Measurement Using Dummy Region Marks
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Solution Overview
Problem
In liquid crystal display devices, the seal line width and position cannot be accurately measured in real time during the fabrication process, leading to potential misalignment of liquid crystal molecules and image deterioration, as current methods rely on human eye inspection or estimation based on sealant deposition amounts, resulting in defective substrates and increased costs.
Innovation Solution
Incorporating a plurality of measuring marks in the dummy region of the liquid crystal display device, which can be overlapped with the seal line, allowing for real-time measurement of the seal line's position and width using a camera and image analysis unit, enabling precise detection and judgment of seal line quality during fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If seal line measurement is performed using human eye inspection or estimation based on sealant deposition amount, then the fabrication process can proceed without additional measurement devices, but the measurement precision and manufacturing precision deteriorate leading to defective substrates
Solution Approach 1:
The patent applies preliminary action by forming measuring marks (such as metal patterns) on the substrate before the seal line deposition process. These pre-positioned marks serve as reference points that enable accurate measurement of the seal line's position and width after deposition, without requiring complex measurement devices during the fabrication process. The measuring marks are strategically placed in the dummy region to facilitate subsequent measurement while maintaining process simplicity.
2Manufacturing precision
If real-time seal line measurement is implemented during fabrication, then manufacturing precision improves and defective substrates are reduced, but the device complexity and measurement system requirements increase
Solution Approach 1:
The patent uses measuring marks that create a measurable pattern (such as metal patterns with specific geometries) that can be easily captured and measured by simple imaging devices like cameras. The measuring marks serve as physical copies or references that translate the complex measurement task into a simple image analysis problem, where the position and width of the seal line can be determined by comparing it against the known positions and dimensions of the measuring marks.
3Productivity
If seal line width and position are not accurately measured, then the fabrication process remains simple and fast, but liquid crystal molecule alignment deteriorates and image quality decreases
Solution Approach 1:
The patent implements feedback by measuring the position and width of the seal line using the pre-formed measuring marks and analyzing the measurement results to determine whether the seal line meets specification requirements. This feedback mechanism allows for real-time quality control during fabrication, enabling immediate detection of deviations in seal line positioning or width that could compromise liquid crystal molecule alignment and image quality, while maintaining efficient production throughput.
Data Source
AI summary
The present invention disposes a plurality of measuring marks on a dummy region having a seal line to detect a position and a width of the seal line during a fabrication process of a liquid crystal display device and then process can be terminated without further processes in case of bad quality of the seal line, thereby process delay and cost may be minimized.