Patent
Capacitive fingerprint sensor and the panel thereof
Kai Lan Chuang,Ying Lieh Chen +1 more
TLDR
In this paper, a capacitive fingerprint sensor consisting of a fingerprint, a reference capacitor, a first transistor, a second transistor, and a comparator is configured to precharge the fingerprint and reference capacitors.Abstract:
A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor, a second transistor, a comparator and a multiplexer. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. One end of the reference capacitor CS is connected to the fingerprint capacitor, and the other end is connected to a trigger signal, wherein the trigger signal is initiated only during a precharge phase. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to precharge the fingerprint and reference capacitors. One end of the comparator is connected to the second transistor. The multiplexer is connected to another input end of the comparator for providing a first voltage VA and a threshold voltage Vth.read more
Citations
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Patent
Display panel and display device
TL;DR: In this paper, a display panel and a display device are provided, and the display panel comprises a central region and peripheral regions, where the peripheral regions are provided at two opposite ends of the display and have a first curvature.
Patent
Capacitive sensor packaging
Benjamin J. Pope,Shawn X. Arnold,Barry J. Corlett,Terry L. Gilton,Syed Husaini,Steven Webster,Scott A. Myers,Matthew D. Hill,Benjamin B. Lyon +8 more
TL;DR: In this article, an apparatus comprises a fingerprint sensor having a set of capacitive elements configured for capacitively coupling to a user fingerprint, and the fingerprint sensor is disposed under a control button or display element of an electronic device.
Patent
Fingerprint sensor in an electronic device
Marduke Yousefpor,Jean-Marie Bussat,Benjamin B. Lyon,Giovanni Gozzini,Steven Porter Hotelling,Dale R. Setlak +5 more
TL;DR: In this article, a fingerprint sensor can be implemented as an integrated circuit connected to a bottom surface of a cover sheet, near the bottom of the cover sheet or connected to the top of a display.
Patent
Apparatus and Method for TFT Fingerprint Sensor
TL;DR: In this article, a low cost, two-dimensional, fingerprint sensor includes a pixel array, each pixel including a switch and a pixel electrode for forming a capacitance with a fingertip.
Patent
Biometric sensor stack structure
TL;DR: In this article, various structures and methods are disclosed for packaging a biometric sensor, such as a capacitive sensor, which can incorporate various placements of the biometric sensors, structure surrounding a biometrics sensor, connection structures (electrical, physical, or both), and techniques for enhanced sensor imaging, sensor retention, and guiding a user's finger to a proper location above a Biometric sensor.
References
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Patent
Methods and systems for detecting a capacitance using sigma-delta measurement techniques
TL;DR: In this article, a voltage is applied to the measurable capacitance using a first switch to detect the position of a finger, stylus or other object with respect to a button, slider, touchpad or other input sensor.
Patent
Capacitance detector circuit, capacitance detection method, and fingerprint sensor using the same
Yuichi Umeda,Junichi Sato +1 more
TL;DR: In this article, a PN code generating unit is used to generate a code having orthogonality in time sequence to output the generated code as a column drive signal, a column line drive unit for driving a predetermined one of the column lines which are selected in response to the code, a capacitance detecting unit, connected to the row line, for detecting a voltage by converting a total sum of changes in capacitance at intersections of the selected column lines into the voltage, and a decode processing unit for performing a predetermined calculation on the detected voltage output from the capacitance detector unit
Patent
Capacitive fingerprint sensor with adjustable gain
TL;DR: In this paper, a planar array of closely-spaced capacitive sense elements is used to measure the distance between a finger and a single capacitive plate and the finger surface.
Patent
Electrostatic capacitance detection device
TL;DR: In this paper, the authors proposed a superior electrostatic capacitance detecting device, which can include M number of row lines, N number of column lines, and ECS devices formed at intersections of these lines.
Patent
Capacitive fingerprint sensor
TL;DR: In this article, a capacitive fingerprint sensor includes a plurality of capacitive sensing members arranged in a 2D array, and a charge-sharing principle is utilized to read signals in the capacitive sensor.