Device for the regulation of light transmission

• US 10,705,365 B2
• Filed: 06/20/2016
• Issued: 07/07/2020
• Est. Priority Date: 07/16/2015
• Status: Active Grant

• Current Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Original Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Inventors: Van Oosten, Casper Laurens
• Primary Examiner(s): Vu, Phu
• Application Number:
  US15/745,317
• Publication Number:
  US 20180210272A1
• Time in Patent Office: 1,478 Days
• CPC Class Codes: B32B 17/10055 with at least one intermediate air space
• CPC Class Codes: B32B 17/10504 Liquid crystal layer
• CPC Class Codes: E06B 2009/2405 Areas of differing opacity for light transmission control
• CPC Class Codes: E06B 2009/2464 featuring transparency control by applying voltage, e.g. LCD, electrochromic panels
• CPC Class Codes: E06B 9/24 Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00
• CPC Class Codes: G02F 1/133374 for displaying permanent signs or marks
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/133391 Constructional arrangement for sub-divided displays

Abstract

The present application concerns a switchable device for the regulation of light transmission, which has a compartmented structure, where the switching state of each of the compartments can be controlled individually.

Claims

1. A window apparatus comprising:

a window and a switchable device for regulation of light transmission,

wherein said switchable device comprises;

a stack of layers which comprises a first substrate layer, a second substrate layer, a switching layer positioned between the first substrate layer and the second substrate layer wherein said switching layer comprises at least two separated compartments, a first conductive layer which is positioned between the switching layer and the first substrate layer, and a second conductive layer which is positioned between the switching layer and the second substrate layer, wherein said at least two separated compartments of said switching layer comprise a first compartment and a second compartment,

where each of the separated compartments of the switching layer comprises a material which changes light transmissivity upon application of a voltage, and the first compartment comprises a different composition of a switching layer material than the second compartment,

wherein the material in each of the compartments of the switching layer is, in each case independently, a liquid crystal switching layer material, and wherein the switching layer material of each compartment comprises one or more dichroic dyes dissolved in a liquid crystalline material,

wherein the separated compartments are formed by surrounding solid borders and said second compartment is formed by a surrounding solid border within the compartment of said first compartment.

2. The window apparatus according to claim 1, wherein at least one of the separated compartments is switched by application of an electric field between at least two different switching states, where one of the states is a dark state, and the other state is a clear state.

3. The window apparatus according to claim 1, wherein each separated compartment is switched individually by application of an electric field between at least two different switching states.

4. The window apparatus according to claim 1, wherein each compartment shows a different transmission while being switched by application of an electric field between at least two different switching states, individually.

5. The window apparatus according to claim 1, wherein isolating sections of each conducting layer are created by a method selected from laser ablation, chemical etching, laser photolithography, mechanical embossing techniques, and photo embossing;

or by sputtering an ITO (indium tin oxide) or similar conductive material coating as a conductive layer while certain sections are covered, and later on remove the covering material to obtain a glass section without the coating;

or by coating conductive material only in specific sections by inkjet printing of solution processable conductors.

6. The window apparatus according to claim 1, wherein the liquid crystal switching layer material is selected from polymer comprising liquid crystal switching layer materials and from small molecule based liquid crystal switching layer materials.

7. The window apparatus according to claim 1, wherein the liquid crystal switching layer material is selected from polymer comprising liquid crystal switching layer materials, which are polymer dispersed liquid crystal switching layer materials.

8. The window apparatus according to claim 1, wherein the liquid crystalline material comprises one or more liquid crystalline organic compounds, which are selected from small molecules and polymeric materials.

9. The window apparatus according to claim 8, wherein in a dark state, the liquid crystalline material is in a state selected from nematic non-twisted, nematic twisted and nematic supertwisted, whereas in a clear state, the liquid crystalline material is in a homeotropic state.

10. The window apparatus according to claim 1, wherein said apparatus comprises two of said switchable devices in a stack.

11. The window apparatus according to claim 1, further comprising a separate touch sensitive device.

12. The window apparatus according to claim 1, wherein said window is an insulated glass unit, and said switchable device is positioned inside of the insulated glass unit.

13. The window apparatus according to claim 11, wherein said separate touch sensitive device is positioned on a frame of the window.

14. The window apparatus according to claim 1, wherein the liquid crystal switching layer material in each compartment comprises at least one dichroic dye, wherein the dye concentration is in the range from 0.1% to 10%.

15. The window apparatus according to claim 1, wherein the liquid crystal switching layer material in each compartment comprises a stabilizer, wherein the stabilizer concentration is 0.1% to 30%.

16. The window apparatus according to claim 1, wherein the liquid crystal switching layer material in each compartment comprises a chiral dopant, wherein the chiral dopant concentration is 0.1% to 30%.

17. The window apparatus according to claim 1, wherein the liquid crystal switching layer material in each compartment has a nematic phase in a temperature range from 0°

C. to 50°

C.