Iodine Polarizer Transparent Portion for Camera Transmittance
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Solution Overview
Problem
Existing image display apparatus, such as smartphones and tablets, face challenges in enhancing camera performance and accommodating diverse shapes and high functionality, particularly in terms of polarizer performance under varying environmental conditions.
Innovation Solution
A polarizer with a resin film containing iodine, featuring a transparent portion with high transmittance and controlled iodine and metal content, designed to maintain optical characteristics across different temperatures and humidity levels, is integrated into the image display apparatus. This polarizer is produced using a method involving decolorization with basic and acidic solutions to create a transparent portion that prevents adverse effects on camera performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polarizer uses a resin film with iodine content to achieve polarization performance, then the polarization performance is improved, but the transmittance stability under high temperature and humidity conditions deteriorates
Solution Approach 1:
The patent applies local quality by creating a transparent portion with different iodine content (1.0 wt% or less) compared to other portions of the polarizer. This localized variation in composition allows the transparent portion to maintain transmittance stability under high temperature and humidity conditions while other portions maintain polarization performance.
Solution Approach 2:
The patent changes the iodine content parameter in different regions of the polarizer. By controlling the iodine content to be 1.0 wt% or less in the transparent portion, the transmittance change (ΔTs) is limited to 10% or less after exposure to 60°C and 90% humidity for 2 hours, thus improving transmittance stability.
2Illumination intensity
If the polarizer is designed with high transmittance in the transparent portion, then the camera performance is improved, but the polarization performance in that region deteriorates
Solution Approach 1:
The patent creates different functional regions within the polarizer: a transparent portion with low iodine content (1.0 wt% or less) for high transmittance to improve camera performance, and other portions with higher iodine content for maintaining polarization performance. This spatial variation in material properties resolves the contradiction between transmittance and polarization performance.
3Strength
If the polarizer uses a thicker resin film to improve durability, then the strength is improved, but the transmittance and camera performance deteriorate
Solution Approach 1:
The patent optimizes the thickness parameter of the resin film to be 8 μm or less. This thickness reduction improves light transmittance for better camera performance while maintaining sufficient durability through proper material selection and composition control, particularly the controlled iodine content and addition of alkali metal or alkaline earth metal compounds.
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 polarizer ensures excellent camera performance by maintaining transmittance stability under harsh conditions, preventing issues like cracking and delamination, and enhancing the overall functionalization of image display devices.
Implementation Method 1
decolorizing a desired portion of a resin film containing a dichromatic substance... the decolorizing is performed by bringing a basic solution into contact with the resin film containing the dichromatic substance
Implementation Method 2
bringing an acidic solution into contact with a portion of the resin film with which the basic solution has been brought into contact
Implementation Method 3
the polarizer has formed therein a transparent portion having a transmittance higher than that of another portion
Data Source
AI summary
There is provided a polarizer that can realize multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus. A polarizer according to an embodiment of the present invention includes a resin film containing iodine, wherein the polarizer has formed therein a transparent portion having a transmittance higher than that of another portion, and when the polarizer is placed under an environment having a temperature of 60° C. and a humidity of 90% for 2 hours, a transmittance change (ΔTs) of the transparent portion is 10% or less.