GHOST KEY PREVENTING CIRCUIT
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United States of America Patent
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Issued Date -
Apr 4, 2024
app pub date -
Jan 5, 2023
filing date -
Oct 4, 2022
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Abstract
A ghost key preventing circuit includes plural driving lines, plural sensing lines, plural key switches, plural bias resistors and a controller. The plural driving lines and the plural sensing lines are collaboratively formed as a matrix circuit. The plural key switches are included in the matrix circuit. The plural bias resistors are connected with the corresponding sensing lines. When the key switch of a specified switch circuit is turned on, a divided voltage is generated and outputted from the specified switch circuit. The controller judges whether the key switch of the specified switch circuit is normally turned on or the key switch is a ghost key according to the divided voltage.
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