公开(公告)号：US20010043728A1

公开(公告)日：2001-11-22

申请号：US09877440

申请日：2001-06-08

Applicant: STMicroelectronics, Inc.

Inventor： Alan Kramer ,  James Brady

IPC: G06K009/00

CPC classification number: G06K9/0002

Abstract: A scanning fingerprint detection system includes an array of capacitive sensing elements, the array having a first dimension greater than the width of a fingerprint and a second dimension less than the length of a fingerprint. Each of the capacitive sensing elements has first and second conductor plates connected across an inverting amplifier, the conductor plates forming capacitors with the ridges and valleys of a fingerprint of a finger pressed against a protective coating above the array, the inverting amplifier generating a signal indicative of a ridge or valley. Circuitry is provided for scanning the array to capture an image of a portion of fingerprint and for assembling the captured images into a fingerprint image.

Abstract translation: 扫描指纹检测系统包括电容感测元件阵列，该阵列具有大于指纹宽度的第一尺寸和小于指纹长度的第二维度。 每个电容感测元件具有连接在反相放大器上的第一和第二导体板，导体板形成电容器，其中脊和指纹的指纹压在阵列上方的保护涂层上，反相放大器产生指示信号 一个山脊或山谷。 提供电路用于扫描阵列以捕获一部分指纹的图像并将捕获的图像组装成指纹图像。

公开(公告)号：US20030035572A1

公开(公告)日：2003-02-20

申请号：US10253841

申请日：2002-09-23

Applicant: STMicroelectronics Inc.

Inventor： Alexander Kalnitsky ,  Alan Kramer

IPC: G06K009/00

CPC classification number: G06F3/044 ,  G06F2203/04107 ,  G06K9/00053 ,  H01L27/0248

Abstract: A planar fingerprint pattern detecting array includes a large number of individual skin-distance sensing cells that are arranged in a row/column configuration. Each sensing cell includes an amplifier having an ungrounded input mode and an ungrounded output node. Output-to-input negative feedback that is sensitive to the fingerprint pattern is provided for each amplifier by way of (1) a first capacitor plate that is placed vertically under the upper surface of a dielectric layer and is connected to the ungrounded amplifier input node, (2) a second capacitor plate that is placed vertically under the upper surface of the dielectric layer in close horizontal spatial relation to the first capacitor plate and is connected to the ungrounded output node, and (3) an ungrounded fingertip whose fingerprint pattern is to be detected, which ungrounded fingertip is placed on the upper surface of the dielectric layer in close vertical spatial relation with the first and second capacitor plates. Electrostatic discharge protection relative to electrostatic potential that may be carried by the ungrounded fingertip is provided by placing a number of grounded metal paths within the dielectric layer to spatially surround each of the first and second capacitor plates, this being done in a manner that does not disturb the ungrounded state of the fingertip.

公开(公告)号：US20020164057A1

公开(公告)日：2002-11-07

申请号：US10188791

申请日：2002-07-02

Applicant: STMicroelectronics Inc.

Inventor： Alan Kramer

IPC: G06K009/00

CPC classification number: G06K9/00899 ,  G06K9/0002 ,  G06K9/78 ,  G11C27/005

Abstract: An integrated circuit includes a sensor that reads a fingerprint and provides data corresponding to the fingerprint to a computation engine coupled to the sensor. The computation engine compares the data to stored data and enables a smart card coupled to the computation engine when the data and the stored data match. The computation engine may include an array of flash memory cells arranged in pairs of rows, where flash memory cells in any one row have sources coupled to a common row line and a plurality of conductance mode neurons each having first and second inputs coupled to first and second row lines forming a respective pair of rows. The neurons are coupled to the flash memory cells through a buffer circuit sets a drain-source voltage of the flash memory cells in the row pair coupled to the neuron.

公开(公告)号：US20020097059A1

公开(公告)日：2002-07-25

申请号：US10054182

申请日：2002-01-18

Applicant: STMicroelectronics, Inc.

Inventor： Marco Tartagni ,  Bhusan Gupta ,  Alan Kramer

IPC: G01R027/26

CPC classification number: G01B7/023 ,  G01B7/004 ,  G01B7/287 ,  G01B7/34 ,  G06K9/0002

Abstract: A distance sensor has a capacitive element in turn having a first capacitor plate which is positioned facing a second capacitor plate whose distance is to be measured. In the case of fingerprinting, the second capacitor plate is defined directly by the skin surface of the finger being printed. The sensor comprises an inverting amplifier, between the input and output of which the capacitive element is connected to form a negative feedback branch. By supplying an electric charge step to the input of the inverting amplifier, a voltage step directly proportional to the distance being measured is obtained at the output.