Polarizer Non-Polarization Portion Recess Depth Control

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Solution Overview

Problem

Current polarizers for image display devices, such as smartphones and notebook PCs, face challenges in achieving multi-functionalization and high-functionalization while maintaining dimensional stability and external appearance, particularly in areas like camera lenses, where a non-polarization portion is required.

Innovation Solution

A polarizer with a non-polarization portion is designed, featuring a thin-walled recessed area on a resin film with a dichromatic substance content of 1.0 wt% or less and a depth of 2 μm or less, allowing for high transmittance and excellent dimensional stability, achieved through a chemical decoloring treatment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a non-polarization portion is formed by chemical decoloring treatment to increase transmittance, then the transmittance of the non-polarization portion is improved, but a recessed portion is formed causing poor external appearance and dimensional instability

Engineering Contradiction:

ImprovetransmittanceVSAvoidexternal appearance

Core Design Contradiction:

Illumination intensityVSShape

Solution Approach 1:

The patent applies parameter changes by precisely controlling the depth of the recessed portion (2 μm or less) and the dichromatic substance content (1.0 wt% or less) in the non-polarization portion. This allows the recess to be shallow enough to suppress visibility and maintain external appearance while still achieving the desired high transmittance through controlled chemical decoloring treatment.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If a non-polarization portion is formed by chemical decoloring treatment to increase transmittance, then the transmittance of the non-polarization portion is improved, but dimensional stability deteriorates

Engineering Contradiction:

ImprovetransmittanceVSAvoiddimensional stability

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The patent controls the dichromatic substance content in the non-polarization portion at 1.0 wt% or less, which maintains sufficient structural integrity and dimensional stability while achieving the required high transmittance. This precise parameter control prevents excessive material removal that would compromise dimensional stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a polyvinyl alcohol-based resin film containing iodine as the dichromatic substance, creating a composite material structure that provides both the desired optical properties (high transmittance in non-polarization portions) and mechanical properties (dimensional stability) through the combination of the resin matrix and dichromatic substance.

Inventive Principle:

Principle #40Composite materials

3Illumination intensity

If the depth of the recessed portion is increased to improve transmittance, then the transmittance is improved, but the recess becomes visible affecting external appearance

Engineering Contradiction:

ImprovetransmittanceVSAvoidvisibility of recess

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent establishes a critical parameter threshold by limiting the recessed portion depth to 2 μm or less. This precise parameter control ensures that the recess is shallow enough to remain invisible from the front surface while still creating sufficient optical path difference to achieve high transmittance in the non-polarization portion.

Inventive Principle:

Principle #35Parameter changes

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 provides a polarizer with improved dimensional stability and external appearance, ensuring high transmittance and suitable arrangement for camera lenses, suppressing the visibility of recesses even after filling with adhesives, and maintaining desired optical characteristics.

Implementation Method 1

a resin film containing a dichromatic substance

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

achieved through a chemical decoloring treatment

Methodology Applied

Scientific EffectChemical decoloring:

Data Source

PatentUS10503004B2Polarizer

Publication Date: 2019.12.10 NITTO DENKO CORP

AI summary

There is provided a polarizer having a non-polarization portion that can achieve the multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus, the polarizer being excellent in dimensional stability and external appearance of the non-polarization portion. A polarizer according to an embodiment of the present invention includes a resin film containing a dichromatic substance, wherein: the polarizer has a non-polarization portion at a predetermined position; and the non-polarization portion includes a thin-walled portion thinner than another portion of the resin film.