Polarizer Non-Polarization Portion Shape Matching Degree
Solution Overview
Problem
Conventional polarizers for image display apparatuses, such as smartphones and notebooks, face challenges in achieving reduced shape unevenness in non-polarization portions, which can lead to alignment issues, especially for camera components.
Innovation Solution
A polarizer with a non-polarization portion having a shape matching degree of 0.05 or less, utilizing a dichromatic substance content of 1.0 wt % or less and an alkali metal and/or alkaline earth metal content of 3.6 wt % or less, specifically designed to match the camera portion of image display apparatuses, is developed. This polarizer includes a polarizing plate and an image display apparatus with a polarizing film laminate that reduces dichromatic substance content in exposed areas to form non-polarization portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the non-polarization portion is formed by removing dichromatic substance, then the transparency is improved, but the shape unevenness increases
Solution Approach 1:
The patent controls the shape matching degree parameter at 0.05 or less by adjusting the dichromatic substance content to 1.0 wt% or less and alkali metal/alkaline earth metal content to 3.6 wt% or less. This parameter control approach resolves the contradiction by finding the optimal balance point where transparency is sufficient while shape unevenness is minimized for camera alignment.
2Illumination intensity
If the dichromatic substance content is reduced to improve transparency, then the photographing performance is improved, but the polarization performance may be compromised
Solution Approach 1:
The patent applies local quality by creating a non-polarization portion with specific compositional characteristics (dichromatic substance content ≤1.0 wt%, alkali metal/alkaline earth metal content ≤3.6 wt%) in the camera area, while maintaining different composition in other areas. This allows the camera portion to have high transparency for good photographing performance while the rest of the polarizer maintains its polarization function.
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 solution improves alignment processability and prevents issues like cracking, delamination, and reduced transmittance, ensuring excellent photographing performance and stability of the camera portion by maintaining desired transparency and dimensional stability.
Implementation Method 1
the non-polarization portion has a dichromatic substance content of 1.0 wt % or less
Data Source
AI summary
Provided is a polarizer having a non-polarization portion with reduced shape unevenness. The polarizer of the present invention is a polarizer having a non-polarization portion, in which the non-polarization portion has a shape matching degree of 0.05 or less. In such polarizer, the number of portions where the shape of the non-polarization portion is distorted is small. Accordingly, when the non-polarization portion of the polarizer is used as, for example, a portion corresponding to a camera portion of an image display apparatus, alignment processability is improved and hence the alignment of the camera can be satisfactorily performed.