Optical laminate and image display device using the same

The optical laminate with a biaxially stretched polyester film and specific refractive index conditions addresses the issue of rainbow unevenness in image display devices, enhancing durability and visibility by suppressing double refraction patterns and improving mechanical properties.

JP2026084317APending Publication Date: 2026-05-21TOPPAN TOMOEGAWA OPTICAL FILM CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TOPPAN TOMOEGAWA OPTICAL FILM CO LTD
Filing Date
2024-11-11
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Conventional polarizer protection films, such as polyester films, exhibit significant birefringence leading to rainbow-like unevenness and reduced visibility in image display devices, especially with increased brightness and color purity, limiting their use in severe environments.

Method used

An optical laminate comprising a biaxially stretched polyester film with specific refractive index conditions (Re, Rth', and Nz') and an optical functional layer, which suppresses double refraction patterns and enhances mechanical properties like bending resistance and adhesion.

Benefits of technology

The optical laminate effectively minimizes moiré and rainbow unevenness while maintaining high durability and brightness, offering excellent bending resistance, pencil hardness, and adhesion in image display devices.

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Abstract

While being excellent in bend resistance, pencil hardness, adhesion, and bright contrast, it suppresses the occurrence of moiré even at low haze. It relates to an optical laminate and an image display device using the same. , 【Solution means】An optical laminate comprising a light-transmissive substrate made of a biaxially stretched PEs film and having birefringence, and an optical functional layer provided on one surface of the light-transmissive substrate, with a total haze of 10% or less, a thickness of the light-transmissive substrate of 20 to 70 μm, and values defined by Re = (nx - ny) × d, Rth’ = (nx - nz) × d, and Nz’ = Rth’ / Re simultaneously satisfying the following conditions (a) to (c ). 20 nm ≤ Re ≤ 400 nm ··· (a) ) 0 nm ≤ Rth’ ≤ 1500 nm ··· (b) 0 nm ≤ Rth’ ≤ 1500 nm ··· (b) Nz’ ≤ 18 ··· (c)​​
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