OPTICAL SENSING MODULE AND FINGERPRINT SENSING DEVICE
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United States of America Patent
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Issued Date -
Nov 9, 2017
app pub date -
May 5, 2017
filing date -
May 6, 2016
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Abstract
An optical sensing module is configured to sense a fingerprint of a finger. The optical sensing module includes an image sensor, a light transmissive layer, and an image selecting layer. The light transmissive layer is disposed on the image sensor, and the image selecting layer is disposed on the light transmissive layer. When the finger touches a side of the optical sensing module adjacent to the image selecting layer, air in valleys of the fingerprint contacts the optical sensing module, so that the image selecting layer has a first transmittance for light from the valleys; ridge of the fingerprint contact the optical sensing module, so that the image selecting layer has a second transmittance for light from the ridges. The first transmittance is not equal to the second transmittance. A fingerprint sensing device is also provided.
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