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Fingerprint sensor with controllable resolution

A fingerprint and finger technology, applied in the field of capacitive fingerprint sensors, can solve the problems of low yield, unrealistic component density, expensive processing nodes, etc., and achieve the effect of low manufacturing cost, high process yield, and mass production.

Active Publication Date: 2019-07-09
FINGERPRINT CARDS ANACATUM IP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dimensions of the sensing structure (pixels) and local amplifiers are mostly fixed, while different resolutions represent a complete redesign of the sensor without addressing the different needs of different markets and customers
Additionally, scaling up the resolution and measurement method only results in unrealistic component densities in the imaging matrix, resulting in the need for smaller and more expensive processing nodes, or in lower yields

Method used

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  • Fingerprint sensor with controllable resolution
  • Fingerprint sensor with controllable resolution
  • Fingerprint sensor with controllable resolution

Examples

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Embodiment Construction

[0046] In this detailed description, various embodiments of a fingerprint sensing device according to the present invention are described mainly with reference to a capacitive fingerprint sensing device included in a mobile phone.

[0047] figure 1 The application of the fingerprint sensing device 100 according to an example embodiment of the present invention is schematically shown in the form of a mobile phone 102 with an integrated fingerprint sensing device 100 . For example, fingerprint sensing device 100 may be used to unlock mobile phone 102 and / or to authorize transactions using the mobile phone, among other things. The fingerprint sensing device 100 according to various embodiments of the present invention may also be used in other devices such as tablet computers, notebook computers, smart cards or other types of consumer electronics.

[0048] figure 2 is a schematic cross-sectional view and a circuit diagram of a part of the fingerprint sensing device 100 accordi...

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PUM

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Abstract

A capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger is provided, the capacitive fingerprint sensor comprising: a protective dielectric top layer to be touched by a finger; a two-dimensional conductive sensing structure disposed below the top layer array; readout circuitry coupled to each of the conductive sensing structures to receive a sense signal indicative of a distance between the finger and the sensing structure, the readout circuitry comprising a plurality of signal amplifiers below the array, wherein the number of signal amplifiers is less than the number of sensing structures; and selection circuitry, which couples each of the sensing structures to at least one signal amplifier and is configured to select the Sensing structures coupled to corresponding signal amplifiers. The present invention also provides a method for controlling a fingerprint sensing device.

Description

technical field [0001] The present invention relates to fingerprint sensors. In particular, the present invention relates to capacitive fingerprint sensors with controllable resolution. Background technique [0002] In order to provide increased security and / or enhanced user convenience, various types of biometric systems are increasingly used. In particular, fingerprint sensing systems have been employed in, for example, consumer electronic devices due to their small form factor, high performance, and user acceptance. [0003] Of the various fingerprint sensing principles available (eg, capacitive, optical, thermal, etc.), capacitive sensing is the most commonly used, especially in applications where size and power consumption are important issues. [0004] All capacitive fingerprint sensors provide a measure representing the capacitance between each of several sensing structures and a finger placed on or moving across the surface of the fingerprint sensor. [0005] With...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06F3/044G06V40/13
CPCG06V40/1306G06V40/1329
Inventor 弗兰克·里戴克汉斯·特恩布卢姆丹尼尔·安德森
Owner FINGERPRINT CARDS ANACATUM IP AB