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Optical distance measurement system and operation method thereof

  • US 9,204,843 B2
  • Filed: 09/13/2012
  • Issued: 12/08/2015
  • Est. Priority Date: 11/18/2011
  • Status: Active Grant
First Claim
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1. An optical distance measurement system configured to detect a finger distance of a finger of a user from the optical distance measurement system and a physiological characteristic of the user, the optical distance measurement system comprising:

  • a first light source configured to provide light of a first wavelength to the finger;

    a second light source configured to provide light of a second wavelength to the finger;

    a light control unit configured to control on-states of the first light source and the second light source;

    an image sensor configured to receive reflected light from the finger at a sampling frequency to generate a plurality of first image frames corresponding to the on-states of the first light source and a plurality of second image frames corresponding to the on-states of the second light source; and

    a processing unit configured tocalculate the finger distance and a finger motion of the finger according to the first image frames or the second image frames, andcalculate the physiological characteristic according to the first image frames and the second image frames when the finger distance is within a predetermined range, whereinthe finger motion is not calculated when the finger distance is within the predetermined range.

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