Finger sensing device with low power finger detection and...

Details Finger sensing device with low power finger detection and... Finger sensing device with low power finger detection and...

2007-08-01

2011-10-04

Pham, Toan N (Department: 2612)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S005520, C340S005820, C340S005830, C382S115000, C382S124000

Reexamination Certificate

active

08031046

ABSTRACT:
A finger sensing device may include an array of finger sensing electrodes, and a processor cooperating with the array of finger sensing electrodes for operation in a lower power consumption finger detecting mode, and for operation in a higher power consumption reading mode upon detection of a finger. The processor may selectively bus together finger sensing electrodes into at least one group from the array thereof when in the lower power consumption finger detecting mode to thereby detect a finger adjacent the array of finger sensing electrodes. Accordingly, a finger may be accurately detected and while in a low power mode, such as may be particularly beneficial to extend battery life for portable electronic devices.

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