Appeal No. 96-2025
Application 07/860,254
shows that the pulse width of the modulation voltage Vm of the
second field of positive drive is determined by inverting the
graduation display data at the time of input to the data
conversion circuit 18.
Appellants further disclose that the voltage waveform
applied to the picture element as shown in Figure 6 (3) is
determined by subtracting the modulation voltage waveform
shown in Figure 6 (1) from the writing voltage waveform shown
in Figure
6 (2). As shown in Figure 6 (3), the resulting voltage
waveform applied to the picture element is a symmetrical
voltage waveform.
The independent claim 1 is reproduced as follows:
1. A symmetrical drive method for driving a display
device formed by interposing a dielectric layer between a
plurality of scanning side electrodes and a plurality of data
side electrodes whose intersections form a plurality of
pixels, the symmetrical drive method comprising the steps of:
applying a positive writing voltage in one of a pair of
fields, and applying a negative writing voltage in the other
of the pair of fields, to each of the plurality of scanning
side electrodes;
3
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