Title:
DEVICE WITH PROXIMITY DETECTION CAPABILITY
Document Type and Number:
WIPO Patent Application WO/2010/135072
Kind Code:
A3
Abstract:
The electrical equivalent of a relatively large area proximity detection capability is provided in a space limited electronic device (20, 30) with many individual input electrodes (24, 34, 44) by dynamically coupling parallel groups of the individual electrodes (24, 34, 44) and applying a proximity and/or contact test thereto. The parallel grouped electrodes act like a single large electrode and permit proximity detection at greater distances and with greater sensitivity. A multiplexer (74) automatically couples individual input electrodes (23, 24, 44) and then parallel grouped electrodes to the proximity (or contact) sensor(s) (46, 66), so that they are scanned and sensed individually and collectively in a time less than human reaction time, whereby the proximity sense function appear as if provided by a separate large area electrode. Proximity spatial detection accuracy is increased by using some of the electrodes (24, 34, 44) as driven shields to remove positional ambiguity.
Inventors:
OSOINACH BRYCE T (US)
KO TAK KWAN VINCENT (CN)
KO TAK KWAN VINCENT (CN)
Application Number:
PCT/US2010/033360
Publication Date:
February 03, 2011
Filing Date:
May 03, 2010
Export Citation:
Assignee:
FREESCALE SEMICONDUCTOR INC (US)
OSOINACH BRYCE T (US)
KO TAK KWAN VINCENT (CN)
OSOINACH BRYCE T (US)
KO TAK KWAN VINCENT (CN)
International Classes:
G06F3/02; G06F3/041
Domestic Patent References:
| WO2009037379A1 | 2009-03-26 |
Foreign References:
| JPH04123736A | 1992-04-23 | |||
| JP2008004465A | 2008-01-10 | |||
| JP2007242571A | 2007-09-20 | |||
| US20030021078A1 | 2003-01-30 |
Other References:
See also references of EP 2433202A4
Attorney, Agent or Firm:
KING, Robert L. et al. (MD: TX32/PL02Austin, TX, US)
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