SANDWICH TYPE FINGERPRINT RECOGNITION DEVICE
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United States of America Patent
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Dec 8, 2016
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Dec 10, 2015
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Abstract
The present invention discloses sandwich type fingerprint recognition devices, one embodiment of the sandwich type fingerprint recognition device includes a first transparent layer, a spatial filter layer with multiple through holes, a second transparent layer and an optical sensor. Another embodiment of the sandwich type fingerprint recognition device includes a first transparent layer, a spatial filter layer with multiple through holes and an optical sensor. With the implementation of the present invention, complex production process or equipment are not required for producing fingerprint recognition device that reduce costs; the size of the fingerprint recognition device is reduced; a variety of thickness choices for the first transparent layer or second transparent layer and a variety of colors can be used and more applications are thus possible; and the contrast of fingerprint signal is enhanced to enable clarifying fingerprint features and characteristics and thus recognition accuracy of fingerprints.
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