Electrophoretic display panel with selective line erasure
First Claim
1. An electrophoretic display apparatus comprises a display panel having a display surface and containing an electrophoretic dispersion of particles in a suspension medium, writing means for forming an image on the display surface in a write mode by attracting charged particles from the dispersion onto the display surface in a plurality of image lines, and line erasing means for selectively erasing a particular image line from among said plurality of image lines during a line erase mode, said particular image being erased by repelling charged particles from only a portion of the display surface corresponding to the image line to be erased such that a remainder of said plurality of image lines remains undisturbed during said line erase mode thereby allowing a new frame having substantial portions the same as the previous frame.
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Accused Products
Abstract
An electrophoretic display apparatus has grid and cathode conductors arranged as an X-Y matrix spaced from an anode with an electrophoretic dispersion in between them. Pigment particles in the dispersion become charged at selected intersection areas of the X-Y matrix and migrate towards the anode to form a display image thereon by biasing the cathode negatively with respect to the anode, and the display image is erased by oppositely biasing the cathode and anode. The anode is formed with a multiplicity of parallel anode line segments corresponding to image lines of the display, and control circuitry is provided for individually controlling the potential applied to each anode line segment in order to allow selective erasure of one or more lines and rewriting of only those lines. A new image frame having a substantial portion thereof the same as a previous frame can thus be rewritten in a shorter time.
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Citations
15 Claims
- 1. An electrophoretic display apparatus comprises a display panel having a display surface and containing an electrophoretic dispersion of particles in a suspension medium, writing means for forming an image on the display surface in a write mode by attracting charged particles from the dispersion onto the display surface in a plurality of image lines, and line erasing means for selectively erasing a particular image line from among said plurality of image lines during a line erase mode, said particular image being erased by repelling charged particles from only a portion of the display surface corresponding to the image line to be erased such that a remainder of said plurality of image lines remains undisturbed during said line erase mode thereby allowing a new frame having substantial portions the same as the previous frame.
Specification