Liquid Crystal Display Seal Material Thickness Control
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Solution Overview
Problem
The existing methods for filling liquid crystals into liquid crystal display panels, such as One Drop Filling (ODF), lead to issues like penetration and leakage due to excessive liquid crystals, requiring costly equipment and processes for in-line control and recovery.
Innovation Solution
A thinner seal material layer is used, with a thickness equal to or less than the liquid crystal layer, and a seal seating layer is applied to manage the seal material, preventing penetration and leakage by ensuring the seal material layer is thinner than the liquid crystal layer in the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick seal material layer is used to prevent leakage, then sealing reliability is improved, but liquid crystal penetration into the seal material increases
Solution Approach 1:
The patent changes the thickness parameter of the seal material layer, making it thinner (equal to or less than the liquid crystal layer thickness) to prevent liquid crystal penetration while maintaining sealing effectiveness through optimized material composition and curing characteristics
2Object-generated harmful factors
If a thin seal material layer is used to prevent liquid crystal penetration, then penetration is reduced, but sealing reliability deteriorates
Solution Approach 1:
The patent uses composite seal material comprising multiple components (e.g., resin, crosslinking agent, filler) that work together to provide both structural integrity for sealing and controlled thickness to prevent liquid crystal penetration
3Object-generated harmful factors
If in-line control and recovery of liquid crystal amount is implemented, then leakage is prevented, but equipment investment and process complexity increase
Solution Approach 1:
The patent performs preliminary action by precisely controlling the seal material layer thickness before liquid crystal filling, which passively prevents liquid crystal penetration and leakage without requiring complex in-line control or recovery equipment
Data Source
AI summary
A production method of a liquid crystal display device that is constructed by placing liquid crystals between a first substrate and a second substrate. The production method includes a step of applying seal material onto the first substrate such that the seal material surrounds a liquid crystal filling area, and a step of bonding the first substrate and the second substrate together. The layer of the seal material is formed such that the thickness becomes smaller than the thickness of the liquid crystal layer in the portion corresponding to the display area when the first substrate and the second substrate are bonded together.