US 12,078,904 B2
Electrochromic device, optical filter, lens unit, image pickup apparatus, window member, and electrochromic mirror
Wataru Kubo, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 15, 2021, as Appl. No. 17/552,046.
Claims priority of application No. 2020-212459 (JP), filed on Dec. 22, 2020; and application No. 2021-174640 (JP), filed on Oct. 26, 2021.
Prior Publication US 2022/0197098 A1, Jun. 23, 2022
Int. Cl. G02F 1/1514 (2019.01); H04N 23/84 (2023.01); H04N 25/11 (2023.01)
CPC G02F 1/1514 (2019.01) [H04N 23/84 (2023.01); H04N 25/11 (2023.01); G02F 2001/15145 (2019.01)] 19 Claims
OG exemplary drawing
 
1. An electrochromic device, comprising:
a first electrode;
a second electrode;
an electrochromic layer disposed between the first electrode and the second electrode, the electrochromic layer containing multiple anodic electrochromic compounds of low-molecular-weight organic compounds and a cathodic redox substance,
wherein the electrochromic device is intended for a photodetector having multiple detection light wavelength regions, and
RGmax is 1.37 or less, wherein RGmax is a maximum value among ratios between red-green-blue (RGB) signal ratios in a transmission state of the electrochromic device and in colored states of the multiple anodic electrochromic compounds, the RGB signal ratios are obtained from TA(λ) and sensitivity of the photodetector, and TA(λ) is a normalized variable transmittance obtained by a combination of absorptions of the multiple anodic electrochromic compounds.