Regioselective substituted cellulose ester C+ compensation film with improved wavelength dispersion
By using a region-selective cellulose ester film, the color shift problem caused by forward wavelength dispersion of C+ film was solved, and reverse wavelength dispersion was achieved, thus improving the viewing quality of the display.
CN115087893BActive Publication Date: 2026-05-26EASTMAN CHEM CO
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- EASTMAN CHEM CO
- Filing Date
- 2021-02-10
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing C+ films typically exhibit positive wavelength dispersion, leading to color shift, and there is a lack of improved wavelength dispersion solutions.
Method used
A regioselectively substituted cellulose ester membrane, containing aromatic -CO-, C1-6 alkyl-CO- and hydroxyl substituents with specific degrees of substitution, combined with rings A, B, C and component A of specific structures, controls the ratio of in-plane phase difference to out-of-plane phase difference of the membrane, thereby achieving improved wavelength dispersion.
Benefits of technology
It achieves reverse wavelength dispersion, significantly suppresses color shift in the display, and improves the viewing quality of the display.
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Figure CN115087893B_ABST
Abstract
This application discloses a membrane comprising a regioselectively substituted cellulose ester and component A, wherein rings A, B, C, and R... 1 R 2 R 5 R 6 R 8 , m, n, and k are as defined herein. This film is a C+ film exhibiting improved wavelength dispersion.
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