Multi-stable electroresponsive smart window and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2020326580-A1
Application number	US-201816498755-A
Country	US
Kind code	A1
Filing date	Oct 10, 2018
Priority date	Apr 28, 2018
Publication date	Oct 15, 2020
Grant date	—

Abstract

A multi-stable electroresponsive smart window and preparation method thereof are disclosed. The multi-stable electroresponsive smart window comprises a first light transmitting conductive substrate, a parallel orientation layer, a positive polymer stabilized cholesteric texture layer, a positive cholesteric texture layer and a second light transmitting conductive substrate disposed in stack successively. The multi-stable electroresponsive smart window of the present disclosure can realize a diversified light transmission state such as colored and transparent state, colored and blur state, colorless and blur state, and colorless and transparent state by changing the magnitude of the access voltage, thereby satisfying the various demands in people's work and life. In addition, the multi-stable electroresponsive smart window of the present disclosure has the characteristics of simple production, rich patterns, energy saving and environmental protection, which has good application prospects in the fields of window glass, home glass window and glass curtain wall, and the like.

First claim

1 . A multi-stable electroresponsive smart window, comprising a first light transmitting conductive substrate, a parallel orientation layer, a positive polymer stabilized cholesteric texture layer, a positive cholesteric texture layer and a second light transmitting conductive substrate disposed in stack successively.

2 . The multi-stable electroresponsive smart window according to claim 1 , wherein the positive liquid crystal used in the positive cholesteric texture layer is the same as that used in the positive polymer stabilized cholesteric texture layer.

3 . The multi-stable electroresponsive smart window according to claim 1 , wherein the chiral dopant used in the positive cholesteric texture layer has the same chirality as the chiral dopant used in the positive polymer stabilized cholesteric texture layer.

4 . The multi-stable electroresponsive smart window according to claim 1 , wherein the positive polymer stabilized cholesteric texture layer is prepared by photocuring the raw materials comprising a polymeric monomer of 2% to 10%, a photoinitiator of 0.1% to 2%, a chiral dopant of 8% to 20%, and a positive liquid crystal of 68% to 89.9%.

5 . The multi-stable electroresponsive smart window according to claim 1 , wherein the positive cholesteric texture layer comprises a chiral dopant of 8% to 20% and a positive liquid crystal of 80% to 92%.

6 . The multi-stable electroresponsive smart window according to claim 1 , wherein the positive polymer stabilized cholesteric texture layer has a thickness of 5 to 50 μm.

7 . The multi-stable electroresponsive smart window according to claim 1 , wherein the positive cholesteric texture layer has a thickness of 5 to 50 μm.

8 . The multi-stable electroresponsive smart window according to claim 1 , further comprising a power supply assembly, the first light transmitting conductive substrate and the second light transmitting conductive substrate are electrically connected to the two poles of the power supply assembly, respectively.

9 . A method for preparing the multi-stable electroresponsive smart window according to claim 1 , comprising the steps of:
taking or preparing a first light transmitting conductive substrate, and preparing a positive polymer stabilized cholesteric texture layer on the surface of the first light transmitting conductive substrate; oppositely arranging the side of the first light transmitting conductive substrate on which the positive polymer stabilized cholesteric texture layer is prepared to the second light transmitting conductive substrate to prepare a liquid crystal cell; and filling the liquid crystal cell with positive cholesteric texture to prepare a positive cholesteric texture layer.

Assignees

• Univ South China Normal
• Shenzhen Guohua Optoelectronics Co Ltd
• Acad Shenzhen Guohua Optoelectronics

Inventors

• Zhou Guofu
• Hu Xiaowen
• Zhao Wei
• Sun Haitao

Classifications

• G02F1/13775

  Polymer-stabilized liquid crystal layers · CPC title

• E06B2009/2464

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

• E06B9/24

  Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; {Slat blinds}(operating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00) · CPC title

• G02F1/13718 Primary

  based on a change of the texture state of a cholesteric liquid crystal · CPC title

• G02F1/137 Primary

  characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering · CPC title