Spread Preventive Wall for Liquid Crystal Display Seal Integrity
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Solution Overview
Problem
In liquid crystal display devices, the alignment film liquid often encroaches upon the seal pattern during the coating process, leading to seal breakage and gap defects due to excessive spreadability and poor adhesiveness, resulting in light leakage and peeling issues.
Innovation Solution
A spread preventive wall is formed on the substrate between the active region and the seal pattern to prevent the alignment film liquid from spreading, comprising a first and second spread preventive wall spaced from each other, with a height lower than the column spacer, to confine the alignment film liquid and reduce the risk of overlap with the seal pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment film liquid is applied to the substrate with excessive spreadability, then the alignment film can be coated more uniformly, but the liquid encroaches upon the seal pattern causing seal breakage and gap defects
Solution Approach 1:
A barrier wall is introduced as an intermediary structure between the alignment film liquid and the seal pattern. This wall acts as a physical mediator that allows the alignment film liquid to spread uniformly in the display region while blocking its encroachment into the seal pattern region, thus resolving the contradiction between coating uniformity and seal integrity
Solution Approach 2:
The substrate surface is segmented into distinct regions by the barrier wall: a display region where alignment film liquid can spread, and a seal pattern region that is protected from liquid encroachment. This segmentation allows different functional requirements to be satisfied in different spatial zones
2Reliability
If alignment film liquid has poor adhesiveness to the seal pattern, then the seal pattern maintains its structural integrity, but the alignment film liquid encroaches and causes peeling and gap defects
Solution Approach 1:
The barrier wall serves as an intermediary that physically separates the alignment film liquid from the seal pattern, eliminating the need for strong adhesion between them. This mediator structure allows the seal pattern to maintain its structural integrity without requiring high adhesiveness to the alignment film liquid
Solution Approach 2:
The problematic interaction between alignment film liquid and seal pattern is extracted by removing the direct contact interface. The barrier wall extracts the seal pattern from the liquid's spread path, preventing the adhesion issues that would otherwise occur
3Ease of manufacture
If no barrier structure is provided, then the manufacturing process is simpler, but alignment film liquid encroaches causing seal breakage and light leakage
Solution Approach 1:
A barrier wall is introduced as a simple intermediary structure that effectively prevents harmful encroachment of alignment film liquid into the seal pattern region. This single structural element addresses multiple harmful effects including seal breakage, gap defects, and light leakage without complicating the overall manufacturing process
Data Source
AI summary
The present invention relates to a liquid crystal display device and a method for fabricating the same, which has a structure applied thereto for preventing a liquid applied to a substrate from passing through a display portion to encroach even to a seal pattern portion causing seal breakage or gap defect.The liquid crystal display device includes first and second substrates placed opposite to each other, each having an active region at a center thereof, a seal pattern formed on an outside circumference of the active region spaced from a boundary portion of the active region, between the first substrate and the second substrate, a spread preventive wall formed on the first substrate between the boundary portion of the active region and the seal pattern, and an alignment film formed on an inner side of the spread preventive wall on the first substrate.