Liquid crystal writing slate with improved light-transmission retention
First Claim
1. In a device of the type having a liquid crystal layer providing two light-modulating characteristics, the improvement comprising:
- a laminate having an LC-layer with first and second surfaces and formed of polymeric material holding micro-volumes of liquid crystal material, and a conductive layer along the first surface, the second surface conductor-free on or along an image-accepting region of the laminate;
movable means for selective transitory application of electrical potential through the LClayer to the conductive layer; and
the LC-layer comprising at least 50% of the polymeric material and less than 50% of the liquid crystal material by weight of the LC-layer, the polymeric material having a volume resistivity of at least about 1015 ohm-centimeters,whereby the laminate has charge-retaining capabilities such that a light-modulating characteristic formed on the image-accepting region by transitory application of potential thereto persists for an extended duration following such application.
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Accused Products
Abstract
A liquid crystal display device includes a base supporting a laminate which has an LC-layer (liquid crystal layer) formed of polymeric material holding micro-volumes of liquid crystal material, and a conductive layer on one surface of the LC-layer, the other surface of the LC-layer being substantially conductor-free, and apparatus for transitory application of potential through the LC-layer to the conductive layer to produce an image. The LC-layer has at least about 50% by weight of the polymeric material and less than 50% of the liquid crystal material by weight of the LC-layer, and the duration of image retention after transitory application of potential ceases is significantly extended.
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Citations
14 Claims
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1. In a device of the type having a liquid crystal layer providing two light-modulating characteristics, the improvement comprising:
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a laminate having an LC-layer with first and second surfaces and formed of polymeric material holding micro-volumes of liquid crystal material, and a conductive layer along the first surface, the second surface conductor-free on or along an image-accepting region of the laminate; movable means for selective transitory application of electrical potential through the LClayer to the conductive layer; and the LC-layer comprising at least 50% of the polymeric material and less than 50% of the liquid crystal material by weight of the LC-layer, the polymeric material having a volume resistivity of at least about 1015 ohm-centimeters, whereby the laminate has charge-retaining capabilities such that a light-modulating characteristic formed on the image-accepting region by transitory application of potential thereto persists for an extended duration following such application. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification