Display Activated by the Presence of a User
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United States of America Patent
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N/A
Issued Date -
Dec 6, 2007
app pub date -
Feb 18, 2005
filing date -
Feb 20, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A display, typically an electroluminescent display, of the type having both an activated, 'on', state and an inactivated, 'off', state, and being switchable between the two, which display incorporates a capacitance sensor, able to detect the near presence of a user, together with means able to utilise the output of this sensor to effect activation of the display accordingly. Preferably, the capacitance sensor comprises a pair of electrodes, one of which may be a front electrode of the electroluminescent display. The capacitance may be sensed by determining the time taken to charge a capacitance; the capacitance may be charged at two or more rates so as to decrease the time taken to measure the capacitance and so reduce the energy consumed.
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