Backflow-Blocking Patterns for LCD Alignment Layer Uniformity
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Solution Overview
Problem
In LCD panel manufacturing, the alignment layer is not uniformly formed due to repulsive forces between the raw material layer and patterns, leading to incomplete liquid crystal control and decreased display quality, especially at corner portions where the material rolls inward.
Innovation Solution
Incorporating backflow-blocking patterns with curvature on the display substrates and sealing members to prevent the alignment layer from rolling inward, ensuring uniform formation and maintaining coherence between substrates, while also forming spread-blocking patterns in seal line regions to prevent alignment layer spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the raw material layer is uniformly coated on the display substrate, then the coating process is simple and efficient, but the alignment layer rolls inward at corner portions due to repulsive forces, resulting in non-uniform formation
Solution Approach 1:
The display substrate is divided into multiple regions: a display region for the alignment layer and a peripheral region containing backflow-blocking patterns. This segmentation prevents the raw material from rolling inward at corners while maintaining uniform coating in the display region.
Solution Approach 2:
Backflow-blocking patterns are introduced as intermediary structures in the peripheral region. These patterns act as barriers that prevent the raw material layer from rolling inward toward the display region, ensuring uniform alignment layer formation.
2Reliability
If the alignment layer is formed only in the display region, then the liquid crystal control is complete, but the corner portions cause material rolling and incomplete formation in peripheral regions
Solution Approach 1:
The substrate is segmented into display and peripheral regions, with the alignment layer formed in both. The backflow-blocking patterns in the peripheral region prevent material rolling while allowing controlled formation in this area.
3Manufacturing precision
If backflow-blocking patterns are added to prevent material rolling, then alignment layer uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The backflow-blocking patterns are merged with the peripheral region structure of the display substrate. This integration prevents material rolling while minimizing additional structural complexity.
4Area of stationary object
If the alignment layer spreads into seal line regions, then coverage is increased, but the coherence between substrates is decreased and display quality is reduced
Solution Approach 1:
Backflow-blocking patterns serve as intermediary barriers that control the alignment layer formation. These patterns prevent excessive spreading into seal line regions while maintaining adequate coverage in the display region.
Solution Approach 2:
The alignment layer formation is optimized locally: extensive coverage in the display region for liquid crystal control, and controlled limitation in seal line regions to maintain substrate coherence.
Data Source
AI summary
In a display panel and a method of manufacturing the same, the display panel includes a first display substrate, a second display substrate and a sealing member. The first display substrate includes a first alignment layer in a first display region and a first peripheral region of a first base substrate, and a first backflow-blocking pattern in the first peripheral region and having a curvature to surround a vertex portion of the first display region. The second display substrate includes a second alignment layer in a second display region which faces the first display region and a second peripheral region of a second base substrate. The sealing member includes a corner portion having substantially the same curvature as the first backflow-blocking pattern to surround an outline of the first and second peripheral regions.