Appeal No. 99-0872
Application 08/885,399
The appellants explain that their invention solves the
competing problems by providing a large number of data input
lines without leading to a difficult packaging problem or a
costly and complex external drive system requiring additional
high voltage DACs or video amplifiers. (Br. at 5-6). This is
done by providing the large number of input lines by coupling
the active matrix liquid crystal display to “a single crystal
driver chip” of the type commonly used to drive amorphous
silicon TFT AMLCDs [active matrix liquid crystal displays].
(Br. at 5).
The appellants further state (Br. at 5-6):
An example of such a driver chip is the Vivid
VS1184, although others are available. These chips
accept low voltage (3.3v or 5v) digital data through
a bus only one or two pixels wide, and output analog
data of the required amplitude in parallel. The
VS1184, for example, provides 384 outputs. . . .
Since there are now many input leads, the
multiplexer width is narrow (i.e., the number of
array data lines associated with each input lead is
small) and the charging time available for each data
line is long. Thus, each data line can be charged
more precisely, and the voltage signals ultimately
delivered to the pixels and AMLCD cells are more
accurate, allowing accurate rendition of gray levels
and high image fidelity.
. . . . The data input is via the low voltage
digital bus of the driver IC, and the control
signals for this device are similarly low voltage
and easy to generate. The only high voltage signals
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