公开(公告)号：US11640078B2

公开(公告)日：2023-05-02

申请号：US17729623

申请日：2022-04-26

Applicant: TOPPAN Inc.

Inventor： Norihiko Kaneko ,  Souhei Abe

IPC: G02F1/1333 ,  G02F1/1337 ,  G02F1/1343 ,  G02F1/1334 ,  G02F1/133

Abstract: A driver circuit applies a voltage such that clarity of a light control sheet is 83% or less to bring the light control sheet into a first state, and applies a voltage such that haze of the light control sheet according to JIS K 7136 is 15% or less to bring the light control sheet into a second state. The clarity is calculated from the following Formula (1): 100×(LC−LR)/(LC+LR) . . . (1) where LC is an intensity of straight light traveling straight along a traveling direction of parallel light entering the light control sheet, and LR is an intensity of narrow-angle scattered light having an angle within ±2.5° relative to the traveling direction of the parallel light, in light that has passed through the light control sheet.

公开(公告)号：US12044919B2

公开(公告)日：2024-07-23

申请号：US17729680

申请日：2022-04-26

Applicant: TOPPAN Inc.

Inventor： Souhei Abe

IPC: G02F1/1335 ,  G02F1/1334 ,  G02F1/1343 ,  G02F1/1345

CPC classification number: G02F1/133504 ,  G02F1/1334 ,  G02F1/134309 ,  G02F1/13452 ,  G02F1/13454

Abstract: A light control sheet includes a first characteristic and a second characteristic selectively exhibited. In the first characteristic, an absolute value of a change in clarity per unit voltage is greater than an absolute value of a change in haze per unit voltage. In the second characteristic, an absolute value of a change in haze per unit voltage is equal to or greater than an absolute value of a change in clarity per unit voltage. Haze is calculated in accordance with JIS K 7136:2000. Clarity is calculated by 100×(LC−LR)/(LC+LR). LC is an intensity of straight light travelling straight along a travelling direction of parallel light that has entered the light control sheet, and LR is an intensity of narrow-angle scattered light having an angle within ±2.5° relative to the travelling direction of the parallel light.