Appeal No. 2003-1955
Application 09/447,544
specification. Figure 1 shows a block diagram of a column driver
circuit. Figure 2 shows a first embodiment according to the
Appellant’s invention. See page 18 of Appellant’s specification.
Figure 2 shows a plurality of column driver circuits 12, each
being adapted for selectively reading the appropriate column.
The output generated by each column driver 12 is multiplexed onto
a test line 18 by multiplexer circuits 19, and further
multiplexed by multiplexer circuit 20 with the output 21 of the
spare column driver 10 to the column drive line of the column
drive circuit 23 under test. See page 20 of Appellant’s
specification. The multiplexed line 18 is fed to an analog
comparator 25, and compared against the output 21 of the spare
column driver 10. If the comparator 25 determines that the
column driver circuit 23 on the test is defective, the column
driver circuit under test is replaced with spare column driver
circuit 10. See page 21 of Appellant’s specification.
Independent claim 1 is representative of Appellant’s claimed
invention and is reproduce as follows:
1. A matrix access system having a plurality of columns,
comprising:
(a) a plurality of circuits each being adapted for
selectively accessing one of said columns;
(b) an interface, communicating data with said plurality of
2
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