Reflective, bi-stable magneto optical display architectures
AssigneeTRED Displays Corporation
InventorsCharles O. Edwards, James Caruso
Life of this patent
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Abstract
Reflective, low-cost display pixels and displays incorporating magneto-optical elements wherein an externally applied magnetic field is perpendicular to an axis of rotation of the magneto-optical elements and parallel to a viewing plane of a display made from these elements. The display elements have a restricted rotation about their long axis which can be actuated by an external magnetic field to produce a bistable, electronically writable image. In addition, architectural modifications to this arrangement can be made such that the power required to write the image to such a display is decreased, overall display efficiency is increased and cross-talk between pixels is nearly eliminated.
Claims19
A magnetic display element comprising:
- a first optical portion having a first color;
- a second optical portion having a second color, wherein the first and second optical portions bisect along a plane of color separation;
- and
- wherein the magnetic display element is magnetized such that a North-South dipole of the display element is coplanar the plane of color separation and perpendicular to an axis of rotation of the display element.
A display device configured to display one or more magnetic elements comprising:
- a one or two dimensional array of pixels, wherein one or more magnetic elements comprise each individual pixel of the array of pixels;
- a plurality of cavities configured to hold at least one pixel;
- wherein each pixel is separated from other the pixels of the display such that each pixel comprises an magnetic domain that is independent from the magnetic domain of any other pixel;
- wherein the independent magnetic domain of each pixel allows the one or more magnetic elements comprising each individual pixel to self-align in a first or second bistable state and to remain in the first or second bistable state in the absence of an outside magnetic force regardless of the actions of other pixels of the array;
- wherein the independent magnetic domain of each pixel allows the two or more magnetic elements comprising each individual pixel to rotate from the first bistable state to the second bistable state or from the second bistable state to the first bistable state when subjected to an outside magnetic force without affecting the orientation of the other pixels of the array;
- and
- wherein at least one of the one or more of the magnetic elements comprises:
- a first optical portion having a first color;
- a second optical portion having a second color, wherein the first and second optical portions bisect along a plane of color separation;
- and
- wherein said at least one magnetic element is magnetized such that a North-South dipole of said at least one magnetic element is coplanar the plane of color separation and perpendicular to an axis of rotation of said at least one magnetic element.
A display device configured to display one or more Magneto-Optical Elements (MOEs) comprising:
- a first plurality of MOEs having a first magnetic field strength and being configured in a first orientation;
- a second plurality of MOEs having a second magnetic field strength that is less than the first magnetic field strength and being configured in the first orientation, wherein the first and second plurality of MOEs are configured such that individual MOEs of the second plurality of MOEs are placed beside individual MOEs of the first plurality of MOEs in an alternating arrangement;
- wherein the first plurality of MOEs rotate to a second orientation in response to an external magnetic field;
- wherein the second plurality of MOEs rotate to the second orientation in response to the rotation of the first plurality of MOEs:
- and
- wherein at least one of the MOEs comprises:
- a first optical portion having a first color;
- a second optical portion having a second color, wherein the first and second optical portions bisect along a plane of color separation;
- and
- wherein said at least one MOE is magnetized such that a North-South dipole of said at least one MOE is coplanar the plane of color separation and perpendicular to an axis of rotation of said at least one MOE.
Dependencies are inferred from the claim text.