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公开(公告)号：US20040227109A1
公开(公告)日：2004-11-18
申请号：US10820464
申请日：2004-04-08
Applicant: STMicroelectronics Ltd.
Inventor： Graeme Storm , Jonathan Ephriam David Hurwitz
IPC: H01L027/00
Abstract: An image sensor includes an array of pixels, with each pixel including a photodiode, and a first output circuit for deriving a linear output signal by applying a reset signal to the photodiode and reading a voltage on the photodiode after an integration time. A second output circuit derives a logarithmic output signal by reading a near instantaneous illumination-dependent voltage on the photodiode that is a logarithmic function of the illumination. In the logarithmic mode, the pixels are calibrated to remove fixed pattern noise. The pixels may be operated in linear and log modes sequentially, with the linear output being selected for low light signals and the log output being selected for high light signals.
Abstract translation: 图像传感器包括像素阵列，每个像素包括光电二极管，以及第一输出电路，用于通过将复位信号施加到光电二极管并在积分时间之后读取光电二极管上的电压来导出线性输出信号。 第二输出电路通过读取作为照明的对数函数的光电二极管上的近瞬时照明相关电压来导出对数输出信号。 在对数模式下，校准像素以去除固定模式噪声。 像素可以顺序地以线性和对数模式操作，对于低光信号选择线性输出，并且对于高光信号选择对数输出。
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公开(公告)号：US20040227831A1
公开(公告)日：2004-11-18
申请号：US10820463
申请日：2004-04-08
Applicant: STMicroelectronics Ltd.
Inventor： Graeme Storm , Jonathan Ephriam David Hurwitz
IPC: H04N005/335
CPC classification number: H04N5/35518
Abstract: A logarithmic pixel is formed by a photodiode connected to a semiconductor device that is operating based upon a sub-threshold. A logarithmic output is taken from an output node connected to the pixel via an amplifier. To calibrate the pixel, the photodiode is isolated by a switch and a ramp voltage is applied as reference voltage to the amplifier. The ramp voltage acts across the constant internal capacitance of the pixel to produce in-pixel a constant current for calibration purposes.
Abstract translation: 对数像素由连接到基于子阈值操作的半导体器件的光电二极管形成。 通过放大器从连接到像素的输出节点获取对数输出。 为校准像素，光电二极管由开关隔离，斜坡电压作为参考电压施加到放大器。 斜坡电压作用在像素的恒定内部电容上，以产生像素内的恒定电流用于校准目的。
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