Alignment Coating Method for Substrate with Blind Via
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Solution Overview
Problem
The increasing trend of screen-to-body ratio in mobile phone designs, particularly with blind via structures, leads to issues like color shift, Newton's rings, and rainbow patterns due to insufficient liquid crystal molecule arrangement around camera holes in display panels, resulting in suboptimal display effects.
Innovation Solution
An alignment coating structure and method where an opening on the alignment plate corresponds to the blind via, ensuring the polyimide liquid is transferred outside the camera hole area, increasing liquid crystal arrangement randomness and preventing optical distortions like Newton's rings and rainbow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polyimide liquid is coated uniformly across the entire substrate including blind via areas, then the alignment coating process is simple and efficient, but liquid crystal molecules arrange regularly around blind vias causing optical distortions such as color shift, Newton's rings, and rainbow patterns
Solution Approach 1:
The alignment plate is segmented into coating areas and non-coating areas by setting openings that correspond to blind via positions. This segmentation allows polyimide liquid to be applied selectively, preventing regular liquid crystal arrangement around blind vias while maintaining efficient coating processes for other areas.
Solution Approach 2:
Different regions of the alignment plate are given different properties: areas with openings prevent polyimide liquid application to avoid optical distortions, while areas without openings allow normal coating for proper liquid crystal alignment. This local differentiation resolves the contradiction between coating efficiency and optical quality.
2Object-affected harmful factors
If openings are added to the alignment plate to prevent polyimide liquid from coating blind via areas, then optical distortions are prevented, but the alignment plate structure and coating process become more complex
Solution Approach 1:
The alignment plate is divided into functional zones using openings that match blind via positions. This segmentation approach prevents optical distortions by excluding polyimide liquid from specific areas while maintaining a relatively simple overall plate structure that integrates easily into existing coating equipment.
3Object-affected harmful factors
If openings are made precisely matching blind via dimensions, then polyimide liquid is perfectly excluded from blind via areas, but manufacturing precision requirements increase
Solution Approach 1:
The openings in the alignment plate are designed with specific dimensional characteristics matched to blind via positions. By controlling the size, shape, and position of these openings locally, the patent achieves effective exclusion of polyimide liquid from blind via areas while managing manufacturing precision requirements through targeted design rather than uniform high precision across the entire plate.
Data Source
AI summary
An alignment coating method for a substrate includes providing at least one substrate and at least one alignment plate, covering the alignment plate on to the substrate, coating polyimide liquid on the alignment plate, and transferring a polyimide liquid on the alignment plate to a region out of a blind via on the substrate according to a preset printing direction through a printing mechanism. Each of the substrates has the blind via. The alignment plate has at least one opening. The opening corresponds to the blind via.