Ambient light rejection for non-imaging contact sensors
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United States of America Patent
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Jul 17, 2018
Grant Date -
May 16, 2013
app pub date -
Nov 13, 2012
filing date -
Nov 11, 2011
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Abstract
A sensor for capturing images of skin topology is provided having a platen, and a one or two-dimensional array of light sensing pixel elements for receiving light representative of skin topology when skin, such as finger(s), are present upon the platen. Such sensor being improved by structures, layers, or methods for reducing or blocking ambient light which would hinder the light sensing pixel elements from sensing the light representative of skin topology. The sensors are non-imaging contact sensors as they have platen to contact skin to be imaged, and do not require optics, such as lenses for focusing and/or magnification, to enable proper capture of light representative of skin topology on the sensor's light sensing pixel elements.
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