Dimming sheet and dimming device

The dimming sheet's innovative polymer compound structure with specific side-chain configurations addresses the challenge of achieving both transparency and light shielding by controlling liquid crystal molecule orientation, enhancing performance in both states.

JP7868433B2Active Publication Date: 2026-06-02TOPPAN HOLDINGS INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOPPAN HOLDINGS INC
Filing Date
2022-07-12
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing dimming sheets struggle to achieve both good transparency in the transmission state and sufficient light shielding in the scattering state due to the hindrance of liquid crystal molecule orientation by rigid cyclic structures in the polymer compound's main chain.

Method used

A dimming sheet design incorporating a polymer compound with specific side-chain structures, such as general formulas (1-1) and (1-2), which include alkyl or polyether chains between the cyclic structure and the main chain, allowing controlled orientation of liquid crystal molecules.

Benefits of technology

The design enables both good transparency in the transmission state and effective light shielding in the scattering state by facilitating the controlled orientation of liquid crystal molecules.

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Abstract

To provide a light control sheet and light control device, capable of providing both good transparency in the transmissive state and a good light blocking property in the scattering state.SOLUTION: Alignment layers 51 and 52 of a light control sheet 10 disclosed herein contain a polymeric compound having at least either of a structure represented by a general formula (1-1) below and a structure represented by a general formula (1-2) below in a side chain: A1-(CH2)m-A2-(A3)o-A4 ...(1-1), A1-(R-O)n-A2-(A3)o-A4 ...(1-2).SELECTED DRAWING: Figure 1
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