公开(公告)号：US5965871A

公开(公告)日：1999-10-12

申请号：US964924

申请日：1997-11-05

申请人： Zhimin Zhou ,  Zhongxuan Zhang ,  Li-yen Shih ,  Wei Li

发明人： Zhimin Zhou ,  Zhongxuan Zhang ,  Li-yen Shih ,  Wei Li

IPC分类号： G11C19/28 ,  H04N5/357 ,  H04N5/361 ,  H04N5/365 ,  H04N5/374 ,  H04N5/378 ,  H01L27/02 ,  H01L27/14

CPC分类号： H04N5/361 ,  G11C19/285 ,  H04N3/1568 ,  H04N5/3575 ,  H04N5/365

摘要： An active pixel sensing structure includes an array of pixel unit cells each of which an adapted to alternate between a light sensing mode wherein the cell outputs an image signal and a reset mode wherein the cell outputs a reset signal. The image signal is proportional to light incident on the cell, and the reset signal is proportional to a predefined reference potential. An improved readout circuit according to the present invention includes a first sample and hold component for receiving and storing the image signal, and second sample and hold component for receiving and storing the reset signal. A signal amplifier is provided for each sample and hold component. A switching circuit is operable between a first mode and a second mode. In the second mode, the first and second sample and hold components are operatively decoupled from the corresponding signal amplifiers while input terminals of the signal amplifiers are connected to a source of predetermined reference potential. With the switching circuit in the second mode, fixed pattern noise (FPN) attributable to the amplifiers is determined. With the switching means in the first mode, a voltage, D2, is determined across outputs of the signal amplifiers. The voltage, D2, is proportional to a voltage equal to the difference between the image signal and the reset signal plus the FPN voltage. A processing means subtracts the voltage, D1, from the voltage, D2, to develop a signal proportional to the light detected by the cell.

摘要翻译： 有源像素感测结构包括像素单元阵列阵列，每个像素单元阵列适于在单元输出图像信号的光感测模式和其中单元输出复位信号的复位模式之间交替。 图像信号与入射到单元上的光成比例，并且复位信号与预定义的参考电位成比例。 根据本发明的改进的读出电路包括用于接收和存储图像信号的第一采样和保持部件，以及用于接收和存储复位信号的第二采样和保持部件。 为每个采样和保持组件提供信号放大器。 开关电路可在第一模式和第二模式之间操作。 在第二模式中，第一和第二取样和保持分量在信号放大器的输入端连接到预定参考电位的源上时可操作地从相应的信号放大器去耦。 利用第二模式中的开关电路，确定归因于放大器的固定模式噪声（FPN）。 利用第一模式中的开关装置，在信号放大器的输出端上确定电压D2。 电压D2与与图像信号和复位信号之间的差加上FPN电压的电压成比例。 处理装置从电压D2减去电压D1，以产生与由单元检测到的光成比例的信号。

公开(公告)号：US06580455B1

公开(公告)日：2003-06-17

申请号：US09073128

申请日：1998-05-05

申请人： Chi-Shin Wang ,  Zhimin Zhou ,  Li-Yen Shih

发明人： Chi-Shin Wang ,  Zhimin Zhou ,  Li-Yen Shih

IPC分类号： H04N314

CPC分类号： H04N5/363 ,  H04N5/365

摘要： An improved image sensing array including a semiconductive substrate having formed therein an array of discrete substrate areas organized in rows and columns. The array of areas is segmented into a plurality of blocks, each including a sub-array of the areas. At least one of the rows of each block has at least one reader cell formed therein, and the remaining rows of the block have photosensor cells formed in each area thereof. Each column of each block forms a column block including a plurality of photosensor cells, and a node line communicatively coupling each photosensor cell of the column block to an associated reader cell. A row address line is coupled to each photosensor cell in a particular row of the array. A column bit line is coupled to each reader cell in a particular column of the array. A block select line is coupled to each reader cell in a particular row of the array containing reader cells. In response to row select and block select inputs to the row address lines and the block select lines respectively, image data captured by each the photosensor cell is read out to a corresponding column-bit line through an associated reader cell for input to an output processing means. The output processing means may include a device for interpolating the data state of the image data supplanted by each reader cell of the array.

摘要翻译： 一种改进的图像感测阵列，包括其中形成有以行和列组织的离散衬底区域的阵列的半导体衬底。 区域阵列被分割成多个块，每个块包括区域的子阵列。 每个块的行中的至少一行具有形成在其中的至少一个读取器单元，并且该块的其余行在其每个区域中形成有光电传感器单元。 每个块的每列形成包括多个光电传感器单元的列块，以及将列块的每个光电传感器单元通信耦合到相关读取器单元的节点线。 行地址线耦合到阵列的特定行中的每个光电传感器单元。 列位线耦合到阵列的特定列中的每个读取器单元。 块选择线耦合到包含读取器单元的阵列的特定行中的每个读取器单元。 响应于对行地址线和块选择线的行选择和块选择输入，每个光电传感器单元捕获的图像数据通过相关联的读取器单元读出到对应的列位线，以输入到输出处理 手段。 输出处理装置可以包括用于内插由阵列的每个读取器单元取代的图像数据的数据状态的装置。