Polarizing Plate Acicular Particle Alignment
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Solution Overview
Problem
Liquid crystal displays face issues of low visibility and brightness at lateral sides due to poor polarizing plate performance, which is exacerbated by the need for visibility-enhancing layers that complicate manufacturing and increase costs, and the plates' limited bendability and scratch resistance.
Innovation Solution
A polarizing plate with an optically functional layer containing an alkylene glycol group-containing matrix and acicular particles aligned in the in-plane direction, enhancing contrast ratio and bendability while suppressing curl generation and improving scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a visibility-enhancing layer with patterned resin layers is added to improve lateral visibility and contrast ratio, then the contrast ratio and visibility are improved, but the manufacturing complexity increases and processability deteriorates
Solution Approach 1:
The invention extracts and eliminates the complex patterned visibility-enhancing layer from the polarizing plate structure. Instead of using multiple resin layers with patterns at interfaces, the patent uses a simple single-layer optically functional layer containing aligned anisotropic particles that provide the necessary optical enhancement without requiring complex manufacturing processes.
Solution Approach 2:
The invention changes the optical parameters by introducing anisotropic particles with specific refractive index characteristics and alignment properties. The particles are oriented at angles of 45 degrees relative to the polarizing axis, creating the desired lateral visibility enhancement through controlled light scattering and refraction rather than through complex layered patterns.
2Strength
If the polarizing plate is made with high hardness to resist external impact and scratches, then scratch resistance and durability are improved, but the bendability and flexibility deteriorate
Solution Approach 1:
The invention uses a composite optically functional layer combining a polymer matrix material with dispersed anisotropic particles. This composite structure provides both the hardness and scratch resistance needed for durability and the flexibility required for bending applications. The matrix material serves as a flexible binder that maintains structural integrity while allowing the plate to bend without cracking.
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 polarizing plate achieves improved contrast ratio, bendability, and scratch resistance without the need for patterned layers, facilitating easier manufacturing and attachment to panels, and can be used in both flexible and non-flexible display applications.
Implementation Method 1
the optically functional layer includes an alkylene glycol group-containing matrix and anisotropic particles including acicular particles, the acicular particles being aligned with respect to a light absorption axis of the polarizer
Implementation Method 2
a polarizer; and an optically functional layer stacked on a surface of the polarizer
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and an optically functional layer stacked on a surface of the polarizer, and the optically functional layer includes an alkylene glycol group-containing matrix and anisotropic particles including acicular particles, the acicular particles being aligned with respect to a light absorption axis of the polarizer in an in-plane direction of the optically functional layer.