Guide Patterns for LCD Seal Material Positioning
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Solution Overview
Problem
The existing methods for forming a liquid crystal layer in liquid crystal display devices, such as the one drop fill method, often result in unstable seal material application due to misalignment during the coating process, leading to off-centered loops and inconsistent seal material shapes.
Innovation Solution
The implementation of guide patterns with projections on the substrate periphery to stabilize the seal material application, allowing the seal material to be coated in a frame form and ensuring accurate positioning, even when the dispenser is misaligned, by utilizing capillary action and increased surface contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dispenser is used to dispense seal material to draw a closed loop, then the seal material can be applied to form a seal structure, but the dispenser may be misaligned causing the seal material to be applied to an incorrect position leading to an off-centered loop
Solution Approach 1:
The guide patterns are formed on the substrate before the seal material dispensing process. These pre-formed guide patterns serve as positioning references that compensate for potential dispenser misalignment, ensuring the seal material is applied to the correct position even when the dispenser is not perfectly aligned.
Solution Approach 2:
The guide patterns act as an intermediary element between the dispenser and the substrate. They mediate the positioning process by providing visual and physical guidance that translates dispenser movements into accurate seal material placement, effectively decoupling the dispenser alignment from the final seal position.
2Ease of manufacture
If the dispenser is misaligned during the drawing process, then the seal material application process remains simple, but the shape of the seal material becomes unstable and off-centered
Solution Approach 1:
The guide patterns are formed with a material that has different optical properties (appearance) compared to the substrate. This visual contrast allows the dispenser operator to easily track the guide patterns during the dispensing process, making it simpler to maintain accurate positioning even when the dispenser is not perfectly aligned.
Solution Approach 2:
The guide patterns serve as an intermediary positioning system that simplifies the manufacturing process by providing clear visual guidance. They enable operators to quickly and accurately position the seal material without requiring complex alignment procedures or highly precise dispenser calibration.
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 approach significantly reduces the variation in seal material position, achieving a stable and consistent seal material shape, thereby enhancing the reliability and consistency of the liquid crystal display device manufacturing process.
Implementation Method 1
by utilizing capillary action and increased surface contact area
Data Source
AI summary
A liquid crystal display device includes a pair of substrates and guide patterns provided at a periphery of one substrate of the pair of substrates. The guide patterns include a first projection, a second projection on the first projection, a pair of third projections provided on each side of the first and second projections, and a pair of fourth projections formed on the pair of third projections respectively. A seal material is provided on the guide patterns and covering at least one of the first projection and the second projection, and a liquid crystal layer is provided in an area partitioned by the pair of substrates and the seal material.