Light detection circuit for ambient light and proximity sensor

Details Light detection circuit for ambient light and proximity sensor Light detection circuit for ambient light and proximity sensor

2011-06-14

2011-06-14

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

07960699

ABSTRACT:
A circuit for implementing an ambient light sensing mode and a proximity sensing mode includes a first light sensor that is more sensitive to light in the infrared spectrum than to light in the visible spectrum and a light source that emits light in the infrared spectrum. The circuit further includes a second light sensor that is sensitive to light in the visible spectrum and a controller coupled to the first light sensor, the light source, and the second light sensor. The controller is configured to process an ambient light level output from the first light sensor without the light source energized with an output from the first light sensor with the light source energized to implement a proximity sensing mode. Further, the controller is configured to process an output from the second light sensor to implement an ambient light sensing mode.

REFERENCES:
patent: 4851681 (1989-07-01), DePauli
patent: 7148078 (2006-12-01), Moyer et al.
patent: 7235773 (2007-06-01), Newman
patent: 7265397 (2007-09-01), Tower et al.
patent: 2002/0109215 (2002-08-01), Iwaya et al.
patent: 2004/0149036 (2004-08-01), Foxlin et al.
patent: 2005/0087675 (2005-04-01), Ayres
patent: 2005/0162646 (2005-07-01), Tedesco et al.
patent: 2006/0044267 (2006-03-01), Xie et al.
patent: 2006/0128087 (2006-06-01), Bamji et al.
patent: 2006/0164533 (2006-07-01), Hsieh et al.
patent: 2007/0085157 (2007-04-01), Fadell et al.
patent: 2007/0102738 (2007-05-01), Adikisson et al.
patent: 2008/0006762 (2008-01-01), Fadell et al.
patent: 2008/0136336 (2008-06-01), Kalnitsky et al.
patent: 2008/0167834 (2008-07-01), Herz et al.
patent: 2008/0304790 (2008-12-01), Minamio et al.
International Search Report and Written Opinion in PCT/US09/05752 dated Dec. 23, 2009.
International Search Report and Written Opinion for PCT/US2010/021499.

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