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Electronic writing device with dot pattern recognition system

  • US 10,088,701 B2
  • Filed: 11/01/2013
  • Issued: 10/02/2018
  • Est. Priority Date: 11/01/2013
  • Status: Active Grant
First Claim
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1. An electronic writing device comprising:

  • a liquid crystal layer including cholesteric liquid crystal material dispersed in polymer;

    electrically conductive layers disposed on either side of said liquid crystal layer;

    a flexible outer polymer layer that is substantially transparent and is located adjacent one of said electrically conductive layers near a viewing side of the electronic writing device;

    a dot pattern that is optically detectable through said outer polymer layer and said liquid crystal layer;

    a light absorbing layer that absorbs light passing through said liquid crystal layer from the viewing side of the electronic writing device, said light absorbing layer being opaque or semitransparent;

    a stylus configured to apply writing pressure to said outer polymer layer that causes reflectance of said cholesteric liquid crystal material to change so as to display an image on said liquid crystal layer, wherein said stylus is further configured to include a tip that does not dispense ink by which said writing pressure is applied, a sensor adapted to optically record a portion of said dot pattern over which said stylus is moved, and electronic circuitry configured to read said optically recorded portion of said dot pattern and to provide therefrom a digital image or electrical image information of the image displayed on said liquid crystal layer, said electronic circuitry including a transmitter for transmitting to a remote processing device said digital image or said electrical image information; and

    erase electronics that apply a voltage to said electrically conductive layers that places said cholesteric liquid crystal material in an optical state that erases the image.

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