Polarizing Plate Soft Layer Bending Resistance
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Solution Overview
Problem
Existing polarizing plates lack sufficient bending resistance, making them unsuitable for flexible display devices that require thin, lightweight, and foldable designs.
Innovation Solution
A polarizing plate structure comprising a substrate with a polarizing coating layer, adhesive layers, and retardation coating layers, topped with a soft layer that enhances bending resistance through a specific toughness range of 1,000 to 40,000 MPa%, achieved by optimizing the stress-strain curve properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional polarizing plate structure is used, then the device achieves basic polarizing function, but the bending resistance is insufficient for flexible displays
Solution Approach 1:
The patent applies composite materials by combining multiple functional layers including a polarizing layer, retardation layers, adhesive layers, and a soft protective outer layer. This composite structure enhances bending resistance through the synergistic properties of each layer, particularly the soft outer layer that provides flexibility and protection against cracking during bending operations.
Solution Approach 2:
The patent implements flexible shells and thin films by using a soft outer layer with specific mechanical properties (elongation at break of 20-100%) that enables the entire polarizing plate to flex without cracking. This soft layer acts as a protective shell that maintains structural integrity during bending, allowing the polarizing plate to be used in flexible display devices.
2Length of moving object
If the polarizing plate is made thinner for slim design, then the weight and thickness are reduced, but the folding characteristic deteriorates
Solution Approach 1:
The patent uses a soft outer layer with controlled thickness (1-10 μm) and specific mechanical properties (elongation at break of 20-100%) that provides flexibility and prevents cracking during folding. This thin yet resilient layer enables the polarizing plate to maintain both slim profile and reliable folding characteristics.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the thickness and mechanical properties of each layer. The soft outer layer has an elongation at break of 20-100% and specific tensile strength parameters that optimize the balance between thinness and folding resistance, allowing the polarizing plate to be both slim and reliable during folding operations.
3Weight of moving object
If a thin film structure is used to reduce weight, then the weight is reduced, but the bending resistance becomes insufficient
Solution Approach 1:
The patent uses composite materials with a multi-layer structure where each layer contributes specific properties. The soft outer layer with high elongation at break (20-100%) provides bending resistance, while the overall thin film structure keeps the weight low. The composite nature allows the thin structure to achieve sufficient bending resistance through the synergistic effect of different materials.
Solution Approach 2:
The patent implements flexible thin films with optimized mechanical properties, particularly the soft outer layer with elongation at break of 20-100% that provides bending resistance despite the thin overall structure. This thin flexible film structure achieves both low weight and adequate bending resistance for flexible display applications.
Data Source
AI summary
The present invention provides a polarizing plate comprising a substrate, a polarizing coating layer formed on one side of the substrate, a first adhesive layer formed on the polarizing coating layer, a first retardation coating layer formed on the first adhesive layer, a second adhesive layer formed on the first retardation coating layer, a second retardation coating layer formed on the second adhesive layer, and a soft layer formed on the second retardation coating layer, wherein, the soft layer has an amended toughness of 1,000 to 40,000 MPa·%. The polarizing plate according to the present invention has excellent bending resistance and thus can be effectively used for a flexible display.