Kent Displays, Inc.

Don Davis

Clinton Braganza

Duane Marhefka

Todd C Ernst

Forrest Nicholson

Anthony Daniels

Nathan Hirt

A writing device includes a liquid crystal layer including reflective cholesteric liquid crystal material. There are electrically conductive layers between which the liquid crystal layer is disposed. At least one of the electrically conductive layers includes at least two conductive sections. There is a front substrate that is flexible and a back substrate between which the electrically conductive layers and the liquid crystal layer are disposed. Neither the front substrate nor the back substrate includes separated sections. Application of pressure to the front substrate changes a reflectivity of a portion of the cholesteric liquid crystal material to form an image. In one aspect, there is electronic erase circuitry including at least one actuator that independently applies an erase voltage waveform to each of at least two of the conductive sections. In another aspect the electronic erase circuitry includes at least one actuator that independently applies an erase voltage waveform to each of the conductive sections, and that applies erase voltage waveforms to at least two of the conductive sections in combination.

Writing device including cholesteric liquid crystal and having sectional erase

A liquid crystal display with an identifier such as a watermark, serial number, logo or other graphic design, is disclosed. The identifiers can be read electronically or with the human eye. Methods are described for fabricating identifiers on cholesteric writing tablets in particular, with varying shades of gray and hence different degrees of visibility. The identifiers are permanent and not erased when a liquid crystal image on the display is erased.

Liquid crystal display with identifiers

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Conneaut Lake, PA, United States of America

Don Davis