Polarizer with Localized Dichromatic Concentration for Camera Transmittance

The patent applies local quality by creating a low dichromatic substance concentration portion specifically in the camera area of the polarizer, while maintaining normal concentration in other areas. This allows the camera portion to have high transmittance for better image capture, while other portions maintain sufficient polarization performance. The selective concentration distribution resolves the contradiction by optimizing each region's properties according to its functional requirements.

The patent implements local quality by spatially differentiating the dichromatic substance concentration: low concentration (1.0 wt% or less) in the camera portion for high transmittance, and normal concentration in other portions for adequate polarization performance. This localized optimization allows the system to achieve high transmittance where needed without compromising overall polarization functionality.

The patent introduces boric acid as an intermediary substance in the resin film that acts as a dimensional stabilizer. The boric acid content is controlled at 5-20 wt% to prevent excessive swelling of the polyvinyl alcohol-based resin in humid environments. This intermediary component enables the polarizer to maintain dimensional stability while functioning in diverse environmental conditions including high humidity.

The patent applies parameter changes by optimizing the resin film thickness to 30 μm or less, balancing durability and transmittance requirements. This thickness parameter ensures sufficient mechanical strength and durability while maintaining high light transmittance, particularly in the camera portion where thinness is critical for image quality. The parameter optimization resolves the contradiction between durability and transmittance.