FINGERPRINT SENSORS HAVING IN-PIXEL OPTICAL SENSORS
First Claim
1. A fingerprint sensor device for fingerprint detection, comprising:
- a light source configured to emit light at a wavelength; and
an array of sensor pixels configured to acquire an optical image indicative of a fingerprint,each sensor pixel including;
a photodetector configured to detect the emitted light reflected off of a target finger and outputs an optical signal based on the detected reflected light;
a collimator disposed over the photodetector to direct the reflected light in a substantially vertical direction from above the photodetector toward the photodetector; and
sensor signal detection circuitry communicatively coupled to the photodetector, the sensor signal detection circuitry configured to acquire the outputted optical signal.
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Accused Products
Abstract
In one aspect, a fingerprint sensor device for fingerprint detection includes a light source configured to emit light at a wavelength. The fingerprint sensor device includes an array of sensor pixels to acquire an optical image indicative of a fingerprint. Each sensor pixel includes a photodetector to detect the emitted light reflected off of a target finger and output an optical signal based on the detected reflected light. Each sensor pixel includes a collimator disposed over the photodetector to direct the reflected light in a substantially vertical direction from above the photodetector toward the photodetector. Each sensor pixel includes sensor signal detection circuitry communicatively coupled to the photodetector to acquire the outputted optical signal.
129 Citations
23 Claims
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1. A fingerprint sensor device for fingerprint detection, comprising:
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a light source configured to emit light at a wavelength; and an array of sensor pixels configured to acquire an optical image indicative of a fingerprint, each sensor pixel including; a photodetector configured to detect the emitted light reflected off of a target finger and outputs an optical signal based on the detected reflected light; a collimator disposed over the photodetector to direct the reflected light in a substantially vertical direction from above the photodetector toward the photodetector; and sensor signal detection circuitry communicatively coupled to the photodetector, the sensor signal detection circuitry configured to acquire the outputted optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A fingerprint sensor device for fingerprint identification, comprising:
an array of sensor pixel circuitry arranged to form groups of electrically connected sensor pixel circuitry operable to capture fingerprint pattern of a touched portion of a finger, each sensor pixel circuitry in the array including; a light source configured to emit light at a wavelength; a photodetector configured to detect the emitted light reflected off of the touch portion of the finger; and an electrically conductive electrode capacitively coupled to a local part of the touched portion of the finger to form a fingerprint associated capacitor, wherein the electrically conductive electrode is disposed substantially above the photodetector and structured to form a hole through the electrically conductive electrode to substantially collimate the reflected light in a vertical direction from above the electrically conductive electrode toward the photodetector. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for operating a fingerprint sensor device to detect a fingerprint, the method comprising:
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detecting, by an array of sensor pixel circuitry in the fingerprint sensor device, capacitance associated with a touch from a finger indicative of a fingerprint scan; detecting, by the array of sensor pixel circuitry in the fingerprint sensor device, an optical signal associated with light reflected from the finger; and outputting, by the array of sensor pixel circuitry, output signals responsive to the detected capacitance and optical signal. - View Dependent Claims (20, 21, 22, 23)
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Specification