Undulating Barrier Segments for Liquid Crystal Diffusion Control
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Solution Overview
Problem
In liquid crystal display panel fabrication, the diffusion rate of liquid crystal molecules is critical; if too high, contamination by the sealant occurs, and if too low, bubbles form in the peripheral area, leading to display defects that are difficult to detect during quality control.
Innovation Solution
A display substrate with a barrier layer in the peripheral area featuring undulating barrier segments that slow down liquid crystal molecule diffusion and prevent bubble migration into the display area, comprising a base substrate with a barrier layer having a first side proximal to the interface between the display and peripheral areas with a convex surface and a second side distal to the interface with a concave surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal molecules diffuse rapidly to fill the peripheral area, then the peripheral area is filled with liquid crystals, but liquid crystal molecules contaminate the sealant before it solidifies
Solution Approach 1:
The sealant is applied and allowed to solidify in advance before liquid crystal molecules are introduced into the peripheral area. This preliminary solidification creates a barrier that prevents contamination while still allowing liquid crystals to fill the peripheral area through controlled diffusion pathways
Solution Approach 2:
The peripheral area is divided into multiple regions by introducing barrier structures that segment the diffusion pathway. This segmentation allows controlled movement of liquid crystal molecules while preventing direct contact with the sealant, resolving the contradiction between filling efficiency and contamination prevention
2Object-affected harmful factors
If liquid crystal molecules diffuse slowly to prevent contamination, then contamination is avoided, but bubbles form in the peripheral area
Solution Approach 1:
Barrier structures with controlled permeability are introduced as intermediary elements between the display area and peripheral area. These intermediaries allow slow, controlled diffusion of liquid crystal molecules while maintaining contamination prevention and enabling bubble migration to the peripheral area without forming defects
Solution Approach 2:
The barrier structures are designed with porous characteristics that allow selective passage of liquid crystal molecules. The porous structure enables controlled diffusion that prevents contamination while allowing bubbles to migrate to the peripheral area where they can be safely contained
3Reliability
If bubbles migrate to the peripheral area, then display quality is maintained, but bubbles are difficult to detect during quality control
Solution Approach 1:
Detection markers or contrast-enhancing structures are introduced in the peripheral area to create visual differences that make bubbles easily detectable during quality control. These markers may change color or create optical contrast when bubbles are present, solving the detection difficulty while maintaining display quality
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
Prevents contamination of liquid crystal molecules by the sealant and effectively guides bubbles into the peripheral area, preventing them from returning to the display area, thus maintaining display quality.
Implementation Method 1
the diffusion rate of liquid crystal molecules is critical; if too high, contamination by the sealant occurs
Implementation Method 2
at least one bubble trap arranged in the outer part of the sealant within the non-display area and patterned to have a concave surface facing toward outside of the non-display area
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3A~3C
AI summary
A display substrate having a display area (6) and a peripheral area (8) is disclosed. The display substrate includes a base substrate, and a barrier layer on the base substrate in the peripheral area including a barrier having a first side (S1) proximal to an interface between the display area (6) and the peripheral area (8) and a second side (S2) distal to the interface (IF) between the display area (6) and the peripheral area (8). The first side (S1) has a first undulating shape, and the second side (S2) has a second undulating shape. The barrier includes a plurality of barrier segments (1), two adjacent barrier segments (1) are spaced apart from each other, thereby forming an opening between the two adjacent barrier segments (1) of the barrier. At least one of the plurality of barrier segments (1) has a bend protruding towards the interface (IF) between the display area (6) and the peripheral area (8), thereby forming a convex surface on the first side (S1) and a concave surface on the second side (S2).