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1. 发明授权

US5940526A Electric field fingerprint sensor having enhanced features and related methods 失效
标题翻译：具有增强特征和相关方法的电场指纹传感器
公开(公告)号：US5940526A
公开(公告)日：1999-08-17
申请号：US858144
申请日：1997-05-16
申请人： Dale R. Setlak , Nicolaas W. Van Vonno , Rex Lowther , Dave Gebauer
发明人： Dale R. Setlak , Nicolaas W. Van Vonno , Rex Lowther , Dave Gebauer
IPC分类号： G01B7/28 , A61B5/117 , G06K9/00 , G06T1/00
CPC分类号： G06K9/0002
摘要： A fingerprint sensor includes a plurality of semiconductor devices adjacent a substrate and defining active circuit portions, and having only three metal layers. More particularly, the sensor may include a first metal layer interconnecting predetermined ones of the plurality of semiconductor devices; a second metal layer defining a ground plane; and a third metal layer comprising an array of electric field sensing electrodes connected to active circuit portions for generating an output related to a sensed fingerprint. The fingerprint sensor may also include a package surrounding the substrate and having an opening aligned with the sensing electrodes. In addition, a first external electrode may be carried by the package for contact by a finger. The sensor may thus also include an excitation drive circuit connected between the ground plane and the first external electrode for generating electric fields between the electric field sensing electrodes and adjacent finger portions. A power control circuit is for controlling operation of active circuit portions based upon sensing finger contact with the first external electrode so that the active circuit portions are powered upon sensing finger contact with the first external electrode and otherwise grounded. A second external electrode may be connected to a bleed resistor to bleed charge from the finger prior to switching from the grounded to the powered state. An amplifier connected between each electric field sensing electrode and associated shield electrode may be operated at a gain of greater than one for additional noise rejection.
摘要翻译：指纹传感器包括与基板相邻并且限定有源电路部分并且仅具有三个金属层的多个半导体器件。更具体地，传感器可以包括互连多个半导体器件中的预定半导体器件的第一金属层; 限定接地平面的第二金属层; 以及第三金属层，包括连接到有源电路部分的电场感测电极的阵列，用于产生与感测的指纹相关的输出。指纹传感器还可以包括围绕衬底并具有与感测电极对准的开口的封装。此外，第一外部电极可以由包装件携带以用手指接触。因此，传感器还可以包括连接在接地平面和第一外部电极之间的激励驱动电路，用于在电场感测电极和相邻的手指部分之间产生电场。功率控制电路用于基于感测到与第一外部电极的手指接触来控制有源电路部分的操作，使得有源电路部分被感测到与第一外部电极的手指接触并以其它方式接地。第二外部电极可以连接到放电电阻器，以在从接地切换到供电状态之前从手指泄放电荷。连接在每个电场感测电极和相关联的屏蔽电极之间的放大器可以以大于1的增益操作以用于附加的噪声抑制。

2. 发明授权

US06259804B1 Fingerprint sensor with gain control features and associated methods 失效
标题翻译：具有增益控制功能和相关方法的指纹传感器
公开(公告)号：US06259804B1
公开(公告)日：2001-07-10
申请号：US08858142
申请日：1997-05-16
申请人： Dale R. Setlak , John Cornett , Brian Kilgore , Daryl Williams , Dave Gebauer
发明人： Dale R. Setlak , John Cornett , Brian Kilgore , Daryl Williams , Dave Gebauer
IPC分类号： G06K900
CPC分类号： G06K9/0002 , G07C9/00158
摘要： A fingerprint sensor includes an array of fingerprint sensing elements; analog-to-digital (A/D) converters having a controllable range; a scanner to perform sequential A/D conversions of predetermined ones of the array of fingerprint sensing elements; and a range determining and setting circuit for controlling the range of the A/D converters based upon prior A/D conversions to thereby provide enhanced conversion resolution. A plurality of A/D converters are preferably used for simultaneously converting analog signals from a corresponding plurality of fingerprint sensing elements. The A/D converters may include at least one reference voltage input for permitting setting of first and second points of the range. The range scale determining and setting circuit may generate a histogram based upon prior A/D conversions. In addition, the range scale determining and setting circuit may set a default range for initial ones of the fingerprint sensing elements.
摘要翻译：指纹传感器包括指纹感测元件阵列; 具有可控范围的模数（A / D）转换器; 扫描器，用于执行指纹感测元件阵列中预定的那些的顺序A / D转换; 以及用于基于先前的A / D转换来控制A / D转换器的范围的范围确定和设置电路，从而提供增强的转换分辨率。多个A / D转换器优选地用于同时转换来自相应的多个指纹感测元件的模拟信号。 A / D转换器可以包括用于允许设置该范围的第一和第二点的至少一个参考电压输入。范围尺度确定和设置电路可以基于先前的A / D转换来生成直方图。此外，范围尺度确定和设置电路可以为指纹感测元件的初始值设置默认范围。

3. 发明授权

US6067368A Fingerprint sensor having filtering and power conserving features and related methods 失效
标题翻译：指纹传感器具有滤波和省电功能及相关方法
公开(公告)号：US6067368A
公开(公告)日：2000-05-23
申请号：US857524
申请日：1997-05-16
申请人： Dale Setlak , Dave Gebauer
发明人： Dale Setlak , Dave Gebauer
IPC分类号： G01B7/28 , A61B5/117 , G06K9/00 , G06K9/60 , G06T1/00 , G07C9/00
CPC分类号： G06K9/00912 , G06K9/0002 , G06K9/00067 , G06K9/60 , G07C9/00158
摘要： A fingerprint sensor includes an array of fingerprint sensing elements and associated active circuits and an impedance matrix filter connected to the active circuits for filtering the signals. The impedance matrix filter preferably comprises a plurality of impedance elements with a respective impedance element connectable between each the active circuit for each fingerprint sensing element and at least one other active circuit for an adjacent fingerprint sensing element. The impedance matrix filter may also include a plurality of switches with a respective switch connected in series with each impedance element. In one embodiment, the switches may be selectively operated to determine ridge flow directions of the fingerprint image. In addition, the ridge flow directions may be used to determined a core location of the fingerprint image. The switches may also be selectively operated to convert a gray scale fingerprint image to a binarized fingerprint image. Accordingly, processing of the fingerprint image may be carried out at the sensor and thereby reduce additional downstream computational requirements. In addition, sets of active circuits may be sequentially powered while the corresponding impedance elements are also sequentially connected. Further, subsets of active circuits may read during the sequential powering.
摘要翻译：指纹传感器包括指纹感测元件阵列和相关联的有源电路以及连接到有源电路的用于滤波信号的阻抗矩阵滤波器。阻抗矩阵滤波器优选地包括多个阻抗元件，其中相应的阻抗元件可在每个用于每个指纹感测元件的有源电路和用于相邻指纹感测元件的至少一个其它有源电路之间连接。阻抗矩阵滤波器还可以包括具有与每个阻抗元件串联连接的相应开关的多个开关。在一个实施例中，可以选择性地操作开关以确定指纹图像的脊流方向。此外，脊流动方向可用于确定指纹图像的核心位置。还可以选择性地操作开关以将灰度指纹图像转换为二值化指纹图像。因此，可以在传感器处执行指纹图像，从而减少额外的下游计算要求。此外，有源电路组可以顺序供电，同时相应的阻抗元件也顺序连接。此外，在顺序供电期间可以读取有源电路的子集。

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