Liquid crystal writing slate

Details Liquid crystal writing slate Liquid crystal writing slate

1990-08-09

1992-05-19

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 74, 359 83, 359 84, 340706, 340784, 178 18, G02F 1133, G09G 302, G09G 336, G08C 2100

Patent

active

051153300

ABSTRACT:
A slate, such as a writing/drawing slate, 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, a conductive layer on one surface of the LC-layer, and a substantially transparent protective overlayer on the other surface of the LC-layer, apparatus for transitory application of potential through the LC-layer to the conductive layer to produce an image on the image-displaying surface area, and apparatus secured to the base to facilitate erasing of the image. In preferred embodiments the other surface of the LC-layer is substantially conductor-free.

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