公开(公告)号：US12210238B2

公开(公告)日：2025-01-28

申请号：US18430877

申请日：2024-02-02

Applicant: TOPPAN Inc.

Inventor： Yoshitaka Matsubara

IPC: G02F1/1335 ,  G02B5/22 ,  G02F1/1339 ,  G02F1/1343 ,  G02F1/137

Abstract: A light control sheet includes: a laminate having a light control layer containing a liquid crystal compound and a dichroic dye; and a first protective layer and a second protective layer that are disposed to the laminate and absorb light in an absorption wavelength range including an ultraviolet region. The laminate in an opaque state has a chromaticity a* of −15 to 15 and a chromaticity b* of −16 to 15 in a CIE1976 (L*a*b*) color system in accordance with JIS-Z-8781-4. The smallest value of the absorption wavelength range is 360 nm or less, and the upper limit of the absorption wavelength range is 410 nm to 430 nm within the visible region. The protective layers have a chromaticity a* of −10 to 0 and a chromaticity b* of 0 to 15 in a CIE1976 (L*a*b*) color system in accordance with JIS-Z-8781-4.