Abstract
The electrophoretic display (EPD) has been widely applied on electronic
readers (E-Readers) for displaying image/text contents. With a touch panel,
the user can put annotations on the contents at will. However, none of the
available E-Readers support the function of paintbrush, which allows the user
to plot gray tone figures. This is because the EPD is a bistable display whose
driving method is quite complicated. In this paper, we first discuss the issues
of realizing paintbrush function on the EPD display controller and then propose
a new signal processing engine for the paintbrush function. The engine contains
four stages: 1) screening the detected pixel coordinates; 2) interpolating
pixels; 3) performing image halftoning to generate more visual gray levels;
and 4) driving the pixels to the target states. The experimental results show
that the engine meets the real-time requirement to complete the pixel interpolation
as well as produce the gray-tone traces.
© 2014 IEEE
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