Flexible electrochromic device

Patent metadata

Field	Value
Publication number	US-11835832-B2
Application number	US-202117342651-A
Country	US
Kind code	B2
Filing date	Jun 9, 2021
Priority date	Jun 10, 2020
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

The embodiments relate to an electrochromic device having flexibility while achieving an excellent light transmission variable function based on the electrochromic principle. The electrochromic device comprises a light transmission variable structure interposed between a first base layer and a second base layer, wherein the light transmission variable structure comprises a first chromic layer and a second chromic layer, and the value of ΔTTd24 as defined in Equation (1) is 3% or less.

First claim

The invention claimed is:

1. An electrochromic device, which comprises a light transmission variable structure interposed between a first base layer and a second base layer,
wherein the light transmission variable structure comprises a first chromic layer and a second chromic layer,
wherein the first chromic layer comprises a reducing chromic material and a polymer resin,
wherein the polymer resin is one or more selected from the group consisting of silicone-based resins, acrylic-based resins, phenolic-based resins, polyurethane-based resins, polyimide-based resins, or ethylene vinyl acetate-based resins,
wherein the value of ΔTTd 24 as defined in the following Equation (1) is 3% or less:
Δ TTd 24 (%)=| TTd 24 −TTd 0 |  (1)

wherein, in Equation (1), TTd 0 is the average transmittance (%) of visible light in the maximum decolored state when electric power is applied after the electrochromic device is deformed to have a radius of curvature of 17 mm,
wherein TTd 24 is the average transmittance (%) of visible light measured after TTd 0 is measured, the electric power is turned off, and the electrochromic device deformed to have a radius of curvature of 17 mm is maintained for 24 hours, and
wherein the electrochromic device has no cracks when it is deformed to have a radius of curvature of 70 mm.

2. The electrochromic device of claim 1 , wherein the value of ΔTTc 24 as defined in the following Equation (2) is 2% or less:
Δ TTc 24 (%)=| TTc 24 −TTc 0 |  (2)

in Equation (2), TTc 0 is the average transmittance (%) of visible light in the maximum colored state when electric power is applied after the electrochromic device is deformed to have a radius of curvature of 17 mm, and
TTc 24 is the average transmittance (%) of visible light measured after TTc 0 is measured, the electric power is turned off, and the electrochromic device deformed to have a radius of curvature of 17 mm is maintained for 24 hours.

3. The electrochromic device of claim 1 , wherein the value of TTRdc as defined in the following Equation (3) is 90% or more:
TTRdc (%)=(Δ TTdc 24 /ΔTTdc 0 )×100  (3)

in Equation (3), ΔTTdc 0 is the difference (%) between the average transmittance of visible light in the maximum decolored state and the average transmittance of visible light in the maximum colored state as measured after the electrochromic device is deformed to have a radius of curvature of 17 mm, and when electric power is applied, and
ΔTTdc 24 is the difference (%) between the average transmittance of visible light in the maximum decolored state and the average transmittance of visible light in the maximum colored state as measured after TTdc 0 is measured, the electric power is turned off, and the electrochromic device deformed to have a radius of curvature of 17 mm is maintained for 24 hours, and when electric power is applied.

4. The electrochromic device of claim 1 , wherein the first chromic layer comprises 2 to 12 parts by weight of the polymer resin relative to 100 parts by weight of the reducing chromic material.

5. The electrochromic device of claim 1 , wherein the second chromic layer comprises an oxidizing chromic material, and the first chromic layer and the second chromic layer are each formed by a wet coating method.

6. The electrochromic device of claim 1 , wherein the first chromic layer has a thickness of 100 nm to 1,000 nm, and the second chromic layer has a thickness of 100 nm to 1,000 nm.

7. The electrochromic device of claim 1 , wherein the first base layer and the second base layer each comprise one or more selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyimide (PI), polycyclohexylenedimethylene terephthalate (PCT), polyethersulfone (PES), nylon, polymethyl methacrylate (PMMA), and cycloolefin polymer (COP).

8. The electrochromic device of claim 1 , wherein the first base layer has a thickness of 10 μm to 300 μm and the second base layer has a thickness of 10 μm to 300 μm.

Assignees

• Skc Co Ltd

Inventors

• Oh Seung Bae
• La Yong Sang
• Lee Seong Hwan
• Shim Jongmin
• Yoo Il Hwan
• Ahn Byeong Uk

Classifications

• G02F1/1533 Primary

  structural features not otherwise provided for · CPC title

• G02F1/15165

  Polymers · CPC title

• E06B2009/2464

  featuring transparency control by applying voltage, e.g. LCD, electrochromic panels · CPC title

• G02F1/155

  Electrodes · CPC title

• G02F1/1514 Primary

  characterised by the electrochromic material, e.g. by the electrodeposited material · CPC title