Device for regulating the passage of energy
First Claim
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1. A device suitable for regulating the passage of energy through a surface, comprisingat least two switching layers S(1) and S(2), each of which comprises a liquid-crystalline medium having a clearing point in the temperature range of 70°
- C. to 170°
C. and comprising three or more dichroic compounds, andorientation layers O(1), O(2), O(3) and O(4),where the said switching layers and orientation layers are present in the device in mutually parallel planes in the sequence O(1), S(1), O(2), O(3), S(2), O(4),where an orientation axis OA(1)* of the molecules of the liquid-crystalline medium of S(1) which are adjacent to O(2) is present in at least one switching state of the device, and an orientation axis OA(2)* of the molecules of the liquid-crystalline medium of S(2) which are adjacent to O(3) is present, and orientation axes OA(1)* and OA(2)* are not parallel to one another and are parallel to the plane of the switching layers,wherein the device is arranged to have the capability to switch between a bright state and a dark state,wherein the device is electrically switchable from a dark state to a bright state and vice versa, wherein the degree of light transmission in the bright state is 60% to 90%, andwherein the device is not goggles, visors or eyeglasses suitable for regulation of the incidence of light on the eyes.
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Abstract
The present application relates to a device for regulating the passage of energy which is characterised in that it comprises at least two switching layers S(1) and S(2) arranged one behind the other, where the switching layers comprise a liquid-crystalline medium comprising at least one dichroic compound.
26 Citations
20 Claims
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1. A device suitable for regulating the passage of energy through a surface, comprising
at least two switching layers S(1) and S(2), each of which comprises a liquid-crystalline medium having a clearing point in the temperature range of 70° - C. to 170°
C. and comprising three or more dichroic compounds, andorientation layers O(1), O(2), O(3) and O(4), where the said switching layers and orientation layers are present in the device in mutually parallel planes in the sequence O(1), S(1), O(2), O(3), S(2), O(4), where an orientation axis OA(1)* of the molecules of the liquid-crystalline medium of S(1) which are adjacent to O(2) is present in at least one switching state of the device, and an orientation axis OA(2)* of the molecules of the liquid-crystalline medium of S(2) which are adjacent to O(3) is present, and orientation axes OA(1)* and OA(2)* are not parallel to one another and are parallel to the plane of the switching layers, wherein the device is arranged to have the capability to switch between a bright state and a dark state, wherein the device is electrically switchable from a dark state to a bright state and vice versa, wherein the degree of light transmission in the bright state is 60% to 90%, and wherein the device is not goggles, visors or eyeglasses suitable for regulation of the incidence of light on the eyes. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- C. to 170°
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2. A device suitable for regulating the passage of energy through a surface, comprising
at least two switching layers S(1) and S(2), each of which comprises a liquid-crystalline medium having a clearing point in the temperature range of 70° - C. to 170°
C. and comprising three or more dichroic compounds, andorientation layers O(1), O(2), O(3) and O(4), where the said switching layers and orientation layers are present in the device in mutually parallel planes in the sequence O(1), S(1), O(2), O(3), S(2), O(4), where an orientation axis OA(1)* of the molecules of the liquid-crystalline medium of S(1) which are adjacent to O(2) is present in at least one switching state of the device, and an orientation axis OA(2)* of the molecules of the liquid-crystalline medium of S(2) which are adjacent to O(3) is present, and orientation axes OA(1)* and OA(2)* are not parallel to one another and are parallel to the plane of the switching layers, wherein the device is arranged to have the capability to switch between a bright state and a dark state, and wherein the device is not goggles, visors or eyeglasses suitable for regulation of the incidence of light on the eyes, wherein the device is electrically switchable, and which device is installed in an opening of a building, a container, a vehicle or another substantially closed space.
- C. to 170°
Specification