Image charge relaxation in electrophoretic displays
AssigneeXonics, Inc.
InventorsJohn H. Lewis, Kathrine J. Lewis, Fremont Reizman, Murray S. Welkowsky
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Abstract
An electrostatic imaging chamber providing a real time visual image. An imaging chamber with electrophoretic particles in the electrode gap, with the particles being selectively moved to a transparent electrode as a result of the electrostatic charge image formed by incoming radiation. An imaging chamber which can be cyclicly operated at a relatively high repetition rate, typically 10 to 20 images per second, thereby providing real time viewing of the object. A conductivity control layer at the gap for discharging the electrostatic charge image each cycle after viewing.
Claims15
In an electrostatic imaging chamber for providing a visual image and having
- first and second electrodes;
- means for supporting said electrodes in spaced relation with a gap therebetween, with said first electrode being relatively transparent optically,
- a plurality of electrophoretic particles in said gap, and
- means for connecting an electric power source across said electrodes for attracting electrons and negative ions toward one electrode and positive ions toward the other depending upon the polarity of the power source and forming an electrostatic charge image,
- the improvement comprising a conductivity control layer at one surface of said gap, with said electrostatic charge image formed at said layer,
- with said particles being selectively moved toward said first electrode as a function of said electrostatic charge image forming a visual image viewable through said first electrode, and with said electrostatic charge image being discharged through said layer.
Dependencies are inferred from the claim text.