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DA852x-UG02-608 Page 40 of 47
User Guide Release 2.0
DA852X E Ink Evaluation Kit
Display Controllers
5
Waveform Phase Table
The Appearance of the transitions between slides is controlled by the Waveform selection, 6 of which are already defined
(Local White then Black, Local Black then White, Slideshow White, Slideshow Black, Global White then Black, Global
Black then White). All use the concept of a waveform phase table as their core.
The ability to import a phase table permits fine control over image transitions, or allows new transition types to be
generated. Please note however that it is possible to generate waveforms which could damage the display by application
of incorrect signals.
The phase table is made up of up to 64 pairs of bytes. The first code byte describes the state of an individual output and
the top plane connection at an instant in time during the transition from one state to another.
A segment can only have one of 4 possible conditions when moving between states:
White > White , White > Black , Black > White, Black > Black as shown in the diagram below.
Since these cannot be accomplished at the same time, the Top Plane (TP) is controlled by the phase table.
0
0
0
Top Plane
Black>Black
White>White
Black>White
White>Black
A one in any location implies that any output of the device will be high if its state change matches the entry in the phase
table entry.
The second byte defines the duration of the phase in units of 10ms.
It is probably easiest to see this in action by considering the following waveform, taken from one of the predefined
waveforms. The parameters have been adjusted to give a larger number of transitions, and do not necessarily produce a
good image transition.
