Polymer-dispersed liquid crystal film and method for manufacturing polymer-dispersed liquid crystal film

The polymer-dispersed liquid crystal film addresses the uniform switching issue by employing non-polymerizable and polymerizable liquid crystal compounds to achieve selective transparency and scattering in specific regions, enhancing design flexibility.

TWI931571BActive Publication Date: 2026-07-11NITTO DENKO CORP
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Patent Information

Application Number
TW111132253
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-09-01
Filing Date
2022-08-26
Publication Date
2026-07-11
Estimated Expiration
2042-08-25

AI Technical Summary

Technical Problem

Existing polymer-dispersed liquid crystal (PDLC) films switch between transparent and scattering states uniformly across the entire surface, lacking the ability to selectively switch in specific areas.

Method used

A polymer-dispersed liquid crystal film with a PDLC layer comprising a polymer matrix and liquid crystal droplets, featuring distinct regions with different haze changes under voltage, utilizing non-polymerizable and polymerizable liquid crystal compounds to control haze in specific patterns.

Benefits of technology

The film achieves selective switching between transparent and scattering states in specific regions, providing a patterned appearance and uniform appearance in other regions, suppressing haze changes through controlled alignment of liquid crystal polymers.

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Abstract

This invention provides a polymer-dispersed liquid crystal film capable of switching between a transparent state and a scattering state only in specific regions. The polymer-dispersed liquid crystal film of this invention sequentially comprises: a first transparent conductive film, a polymer-dispersed liquid crystal layer comprising a polymer matrix and liquid crystal droplets dispersed in the polymer matrix, and a second transparent conductive film. The polymer-dispersed liquid crystal layer, when viewed from above, has a first region and a second region with different haze changes due to applied voltage. The haze change in the first region due to applied voltage is less than that in the second region. The liquid crystal droplets in the first region comprise non-polymerizable liquid crystal compounds and liquid crystal polymers.
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