Appeal No. 1997-0321
Application 08/052,494
The invention is related to a display driver circuit
which includes a means for determining the integrity of the
bond of the output of a display driver circuit to an LCD
display. The driver circuit comprises a bond integrity
detector which makes use of operational aspects of essentially
all of the circuitry associated with the driver. The
integrity detector includes means for driving the display
driver output to a first voltage level. The output of the
display driver is coupled to an output pad which is bonded to
the display. The detector also includes means for applying a
test mode current to the output to change the voltage at the
output pad to a second level. The detector includes means for
defining a sampling time following initiation of the
application of the test mode current to the output. The
detector further includes means for indicating whether the
voltage on the output has reached the second voltage level at
the sampling time, which in turn indicates whether or not the
bonding of the output of the display driver circuit is of
adequate integrity.
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