Gyricon displays utilizing rotating elements and magnetic latching
First Claim
Patent Images
1. A material comprising:
- a) a substrate having two opposed surfaces,b) at least one element, which is capable of being made rotatable by a non-destructive operation, having a diameter and a circumference, disposed in the substrate, said element comprising at least two portions, each portion having an associated optical modulation characteristic, the optical modulation characteristic of at least one portion being different from the optical modulation characteristic of at least one other portion, wherein at least one portion is capable of being permanently magnetized and at least one portion is not capable of being permanently magnetized, and wherein the element has an anisotropy for providing an electrical dipole moment, the electrical dipole moment rendering the element electrically responsive such that when the rotating element is rotatably disposed in an electric field while the electrical dipole moment of the element is provided, the element tends to rotate to an orientation in which the electrical dipole moment aligns with the field, andc) at least one soft magnetic material pad disposed within said substrate associated with the at least one element, spaced from the associated element and so constructed and arranged such that when the at least one portion of the element which is capable of being permanently magnetized is magnetized and the element is oriented such that the at least one magnetized portion of the element is the portion of the element nearest the soft magnetic material pad a magnetic attractive force will exist between the soft magnetic material pad and the at least one magnetized portion.
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Abstract
A sheet material for use in a gyricon display in which a rotatable element, which has a portion which is capable of being permanently magnetized may be oriented to experience an attractive force between itself and a soft magnetic material pad. The attractive force between the element and the pad serve to latch the element in place and prevent unwanted display changes from taking place. The element may be constructed to be either cylindrically or spherically shaped. The element and the soft magnetic material pads may be arranged to provide multiple latching states as desired.
455 Citations
31 Claims
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1. A material comprising:
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a) a substrate having two opposed surfaces, b) at least one element, which is capable of being made rotatable by a non-destructive operation, having a diameter and a circumference, disposed in the substrate, said element comprising at least two portions, each portion having an associated optical modulation characteristic, the optical modulation characteristic of at least one portion being different from the optical modulation characteristic of at least one other portion, wherein at least one portion is capable of being permanently magnetized and at least one portion is not capable of being permanently magnetized, and wherein the element has an anisotropy for providing an electrical dipole moment, the electrical dipole moment rendering the element electrically responsive such that when the rotating element is rotatably disposed in an electric field while the electrical dipole moment of the element is provided, the element tends to rotate to an orientation in which the electrical dipole moment aligns with the field, and c) at least one soft magnetic material pad disposed within said substrate associated with the at least one element, spaced from the associated element and so constructed and arranged such that when the at least one portion of the element which is capable of being permanently magnetized is magnetized and the element is oriented such that the at least one magnetized portion of the element is the portion of the element nearest the soft magnetic material pad a magnetic attractive force will exist between the soft magnetic material pad and the at least one magnetized portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A material comprising:
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a) a substrate b) at least one rotatable element disposed in the substrate, said rotatable element having a diameter and a circumference and said element comprising at least two segments arrayed substantially parallel to one another, wherein each segment is adjacent to at least one other segment and to no more than two other segments, each segment adjacent to exactly one other segment is an exterior segment, and each segment adjacent to exactly two other segments is an interior segment, each segment having an associated optical modulation characteristic, the optical modulation characteristic of at least one segment being different from the optical modulation characteristic of at least one other segment, wherein at least one segment is capable of being permanently magnetized and at least one segment is not capable of being permanently magnetized, and wherein the element has an anisotropy for providing an electrical dipole moment, the electrical dipole moment rendering the element electrically responsive such that when the rotating element is rotatably disposed in an electric field while the electrical dipole moment of the element is provided, the element tends to rotate to an orientation in which the electrical dipole moment aligns with the field, and c) at least one soft magnetic material pad disposed within said substrate and associated with the at least one element, said at least one soft magnetic material pad being spaced from the associated element and so constructed and arranged such that when the at least one portion of the element which is capable of being permanently magnetized is magnetized and the element is oriented such that the at least one magnetized portion of the element is the portion of the element nearest the soft magnetic material pad a magnetic attractive force will exist between the soft magnetic material pad and the at least one magnetized portion.
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31. A material comprising:
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a) a substrate b) at least one rotatable element disposed in the substrate, said rotatable element comprising; i) a substantially clear cylindrical shape having a circumference, a length and a longitudinal axis, ii) at least three display surfaces, the display surfaces being arranged in a circumferential direction around the longitudinal axis to form a substantially polyhedral column having at least three vertices and which extends substantially parallel to the longitudinal axis wherein each display surface has an associated optical modulation characteristic, and the polyhedral column is substantially enclosed by the substantially clear cylindrical shape, and iii) at least three magnetic portions, each magnetic portion being capable of being permanently magnetized and being substantially parallel to the longitudinal axis, the at least three magnetic portions being so constructed and arranged such that each vertex substantially contains one of the at least three magnetic portions, wherein the element has an anisotropy for providing an electrical dipole moment, the electrical dipole moment rendering the element electrically responsive such that when the rotating element is rotatably disposed in an electric field while the electrical dipole moment of the element is provided, the element tends to rotate to an orientation in which the electrical dipole moment aligns with the field, and, c) at least three soft magnetic material pads disposed within said substrate and associated with the at least one element, said at least three soft magnetic material pads being spaced from the associated element and separated from each other around the circumference of the and element, and being so constructed and arranged such that when the at least one portion of the element which is capable of being permanently magnetized is magnetized and the element is oriented such that the at least one magnetized portion of the element is the portion of the element nearest the soft magnetic material pad a magnetic attractive force will exist between the soft magnetic material pad and the at least one magnetized portion.
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Specification