Phase difference film and production method for the same
US11346991B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2020 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Jul 31, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133638
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a phase difference film formed of a resin containing a polymer having crystallizability, and having an NZ factor of less than 1. A production method of the phase different film includes: bonding a second film to one or both surfaces of a first film formed of a resin containing the polymer having crystallizability and having a glass transition temperature Tg (° C.) and a melting point Tm (° C.), to obtain a third film, the second film having a shrinkage percentage in at least one direction at (Tg+30)° C. of 5% or more and 50% or less; heating the third film to Tg° C. or higher and (Tg+3)° C. or lower to obtain a fourth film; and heating the fourth film to (Tg+50)° C. or higher and (Tm−40)° C. or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.