公开(公告)号：US12198324B2

公开(公告)日：2025-01-14

申请号：US18079311

申请日：2022-12-12

Applicant: TOPPAN Inc.

Inventor： Wataru Ookubo ,  Masanori Sakamoto ,  Norihiko Kaneko

IPC: G01N21/59 ,  G06T7/00 ,  G02F1/13

Abstract: The present disclosure provides an evaluation index calculation device, an evaluation index calculation method, and an evaluation index calculation program which are capable of diversifying an evaluation index representing an optical state of a light control sheet. The evaluation index calculation device acquires an evaluation image of an imaging target in a predetermined environment, captured via a light control sheet, and calculates a degree of obscuring caused by the light control sheet in the evaluation image, as an evaluation index, through image analysis of the evaluation image.

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.