Optical laminate, optical laminate with polarizing film, and image display device

The optical laminate design with specific adhesive sheet properties addresses interference unevenness and adhesion issues, enhancing display characteristics and productivity by using a first and second liquid crystal alignment solidification layer with a controlled refractive index and thickness, and monomer/oligomer content in the adhesive sheet.

WO2026116029A1PCT designated stage Publication Date: 2026-06-04NITTO DENKO CORP
View PDF 10 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NITTO DENKO CORP
Filing Date
2025-11-04
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing optical laminates with liquid crystal alignment solidification layers joined via adhesive sheets exhibit localized unevenness (interference unevenness), degrading display characteristics and reducing manufacturing yield in image display devices.

Method used

An optical laminate design comprising a first liquid crystal alignment solidification layer, an adhesive sheet with specific refractive index and thickness, and a second liquid crystal alignment solidification layer, where the adhesive sheet contains monomers and oligomers within a defined range, ensuring the absolute value of the refractive index difference is less than 0.11, and the adhesive sheet thickness is less than 20 μm.

Benefits of technology

Improves display characteristics and manufacturing productivity by minimizing interference unevenness and enhancing adhesion between layers, resulting in a thinner and more stable optical laminate.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure JP2025038700_04062026_PF_FP_ABST
    Figure JP2025038700_04062026_PF_FP_ABST
Patent Text Reader

Abstract

Provided is an optical laminate including a first liquid crystal alignment solidified layer, an adhesive sheet, and a second liquid crystal alignment solidified layer in this order, wherein: the thickness of the adhesive sheet is less than 20 μm; the absolute value of the value calculated by the expression {(n1+n2) / 2-n} is less than 0.11 where n represents the average refractive index of the adhesive sheet, n1 represents the average refractive index of the first liquid crystal alignment solidified layer, and n2 represents the average refractive index of the second liquid crystal alignment solidified layer; the adhesive sheet includes at least one selected from the group consisting of monomers and oligomers; and the content of monomers and oligomers in the adhesive sheet is from 400 ppm to 130,000 ppm (mass basis). This optical laminate is suitable for improving the display characteristics of an image display device and improving the productivity of the optical laminate.
Need to check novelty before this filing date? Find Prior Art