US 12,379,815 B1
Touch sensor, touch panel, and image display device
Kensuke Katagiri, Kanagawa (JP); and Tianhua Ouyang, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Oct. 10, 2024, as Appl. No. 18/911,924.
Claims priority of application No. 2024-030002 (JP), filed on Feb. 29, 2024; and application No. 2024-087034 (JP), filed on May 29, 2024.
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/044 (2006.01); H10K 59/40 (2023.01)
CPC G06F 3/0446 (2019.05) [H10K 59/40 (2023.02)] 14 Claims
OG exemplary drawing
 
1. A touch sensor comprising:
a substrate; and
a sensing electrode disposed on at least one surface side of the substrate,
wherein the substrate includes a visible light absorber, and
the substrate has an internal absorbance A1 of 0.0004 to 0.03 and a parameter X of 30 to 3000 m−1, the internal absorbance A1 and the parameter X being calculated with Test X:
Test X: a visible light reflectance ρ0 of a support white plate is obtained by a method described in JIS R 3106:2019; measurement light is made incident on a laminate formed by laminating the support white plate and the substrate on the substrate side of the laminate to obtain a visible light reflectance ρx by the method described in JIS R 3106:2019; the internal absorbance A1 of the substrate is calculated from the visible light reflectance ρ0 and the visible light reflectance ρx by formula (1) below; and the parameter X (m−1) is calculated from the calculated internal absorbance A1 and a thickness D1 (m) of the substrate by formula (2) below:
A1=−log10{(ρx/ρ0)0.5}  Formula (1)
X=A1/D1.  Formula (2)