Liquid Crystal Cell Assembly Two-Stage Drying for Bubble Prevention
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Solution Overview
Problem
Liquid crystal devices experience bubble formation under high temperature storage conditions, despite pre-drying of sub-assembly components before assembly.
Innovation Solution
A method involving a first drying process for barrier and polariser film components, either by reducing water vapour content in the environment or using a reduced pressure, followed by a second drying process for sub-assembly components before combining them with a liquid crystal cell, utilizing films with varying water vapour transmission rates to minimize moisture retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-assembly components are dried immediately before assembly, then assembly efficiency is improved, but moisture trapped in high WVTR films causes bubble formation under high temperature storage
Solution Approach 1:
The patent applies preliminary action by implementing a two-stage drying process: first drying the individual barrier film and polariser film components before assembly, then drying the assembled sub-assembly components. This preliminary moisture removal from films with high WVTR (water vapour transmission rate) before they are trapped in the final assembly prevents bubble formation during high temperature storage, while still maintaining efficient production throughput.
2Quantity of substance
If high WVTR films are used in sub-assembly components, then moisture transmission is improved for drying, but moisture becomes trapped causing bubbles under high temperature storage
Solution Approach 1:
The patent resolves this contradiction by performing preliminary drying actions on the high WVTR films before they are assembled into sub-assembly components. By drying the individual films first (when their high WVTR is beneficial for moisture removal), then assembling them, the moisture is removed at the optimal time before the films become encapsulated in the final structure where high WVTR would be harmful.
3Device complexity
If barrier film and polariser film components are assembled before drying, then assembly complexity is reduced, but moisture trapped during assembly causes bubbles under high temperature storage
Solution Approach 1:
The patent applies segmentation by dividing the drying process into separate stages: first drying the individual barrier film and polariser film components before assembly, then drying the assembled sub-assembly components. This segmented approach ensures moisture is removed from individual components before they are trapped in the final assembly, preventing bubble formation while maintaining a manageable assembly process.
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
The method significantly reduces bubble formation in liquid crystal devices during high temperature storage by effective degassing and moisture control, enhancing the reliability of the assembly process.
Implementation Method 1
subjecting at least one or more barrier film components and one or more polariser film components for a liquid crystal display device to a first drying process; subjecting the upper and lower sub-assembly components to a second drying process
Implementation Method 2
keeping the barrier film components and polariser components in a reduced pressure environment; keeping the sub-assembly components in a reduced pressure environment
Data Source
AI summary
A method comprising: subjecting at least one or more barrier film components and one or more polariser film components for a liquid crystal display device to a first drying process; thereafter combining at least said barrier film components and polariser components to assemble upper and lower sub-assembly components; subjecting the upper and lower sub-assembly components to a second drying process; and thereafter combining the upper and lower sub-assembly components with at least a liquid crystal cell component to assemble a liquid crystal device.