Magnetically Addressable Bistable Film
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United States of America Patent
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Issued Date -
Jan 14, 2010
app pub date -
Jul 10, 2009
filing date -
Jul 11, 2008
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Abandoned
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Abstract
A magnetically addressable bistable film includes a polymeric substrate impregnated with polymeric microcapsules that contain liquid-suspended magnetically orientable or magnetophoretic material. The material is subject to reorientation either in the plane or perpendicular to the plane of the film, as well to forces of attraction, due to an external magnetic field. The two states provide sufficient difference in light reflectivity to create visible contrast by addressing the film locally, either on a pixel-by-pixel basis or by spatially patterning the driving magnetic field itself. The congregation of magnetophoretic materials in one portion of the microcapsule may also provide sufficient difference in light reflectivity to create visible contrast.
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