Reflective polarizer and optical system including same

EP4747667A1Pending Publication Date: 2026-05-273M INNOVATIVE PROPERTIES CO
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
3M INNOVATIVE PROPERTIES CO
Filing Date
2024-07-15
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

Existing reflective polarizers face challenges in achieving a very low pass state reflectance throughout a visible wavelength range due to differences in dispersion of refractive index with wavelength in conventional material choices for alternating layers.

Method used

The use of different materials for different polymeric layers, specifically combining multiple lower index (LIO) materials and higher index (HIO) materials in alternating layers, to achieve a closer refractive index match across a predetermined wavelength range, thereby minimizing pass state reflectance.

Benefits of technology

This approach results in a reflective polarizer with an average optical reflectance greater than 60% for block polarization and less than 2% for pass polarization across a 50 nm wide wavelength range, effectively reducing ghost images and improving optical system performance.

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Abstract

A reflective polarizer includes a plurality of alternating first and second polymeric layers. For different first and second wavelengths in a predetermined wavelength range and for first and second pairs of adjacent first and second polymeric layers where the first and second pairs are spaced apart along a thickness direction of the reflective polarizer: the first and second polymeric layers of the first pair, but not the second pair, have refractive indices along an in-plane axis that differ by less than about 0.002 for the first wavelength; and the first and second layers of the second pair, but not the first pair, have refractive indices along the in-plane axis that differ by less than about 0.002 for the second wavelength. An optical system can include the reflective polarizer.
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