Patent ID: 7683607

Claim:
A connection testing apparatus, for testing a first connection and a second connection between a first substrate and a second substrate, comprising: a charge source, disposed on the first substrate, for providing charges to a first end of the first connection during a testing period; a first charge draining unit, disposed on the second substrate, for draining the charges from a second end of the first connection during the testing period; a second charge draining unit, disposed on the second substrate, for draining charges from a second end of the second connection during the testing period; and a first switch unit, disposed on the first substrate and coupled between the charge source and the first end of the first connection, so that the charge source is electrically connected to the first end of the first connection during a first sub-period of the testing period; a second switch unit, disposed on the first substrate and coupled between the charge source and a first end of the second connection, so that the charge source is electrically connected to the first end of the second connection during a second sub-period of the testing period; and a comparator, disposed on the first substrate, for comparing a voltage at the first end of the first connection with a reference voltage during the testing period, so as to determine whether the first connection is correct, and the comparator further comparing a voltage at the first end of the second connection and the reference voltage during the second sub-period of the testing period, so as to determine whether the second connection is correct.