Polarizing Plate Laminate Sagging Prevention
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Solution Overview
Problem
Existing liquid crystal display devices face issues with obtaining a clear image when viewed from directions other than the front, particularly in vehicle displays where the display position and driver's line of sight are not parallel, leading to problems with viewing angle and contrast ratio.
Innovation Solution
A polarizing plate laminate is developed, comprising a polarizing plate with a first adhesive layer and a first separate film on one surface, and a second adhesive layer and a second separate film on the other surface, where the second separate film has a total thickness of more than 75 μm and 150 μm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thin second separate film is used, then the device complexity is reduced, but the polarizing plate sags during attachment process causing bubbles
Solution Approach 1:
The patent changes the thickness parameter of the second separate film to a specific range (75-150 μm) to prevent sagging during the attachment process. This parameter optimization ensures the film provides sufficient structural support while maintaining functionality, resolving the contradiction between simplicity and reliability.
2Reliability
If the second separate film thickness is increased, then the sagging phenomenon is prevented, but the manufacturing cost increases
Solution Approach 1:
The patent optimizes the thickness parameter to a specific range (75-150 μm) that provides the minimum necessary support to prevent sagging while avoiding excessive material usage. This balanced parameter selection resolves the contradiction between reliability and material cost.
3Reliability
If a thick second separate film is used, then bubbles are suppressed during attachment, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines a specific thickness range (75-150 μm) that balances bubble prevention with manufacturability. This range is thick enough to prevent sagging and bubbles but not so thick as to demand extreme manufacturing precision, resolving the contradiction between reliability and manufacturing precision.
Data Source
AI summary
A polarizing plate laminate according to an exemplary embodiment of the present disclosure includes: a polarizing plate; a first adhesive layer and a first separate film which are provided on one surface of the polarizing plate; and a second adhesive layer and a second separate film which are provided on the other surface of the polarizing plate, in which the second separate film has a total thickness of more than 75 μm and 150 μm or less.