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1. 发明授权

US08625012B2 Apparatus and method for improving dynamic range and linearity of CMOS image sensor 有权
标题翻译：提高CMOS图像传感器动态范围和线性度的装置和方法
公开(公告)号：US08625012B2
公开(公告)日：2014-01-07
申请号：US12697061
申请日：2010-01-29
申请人： Jie Yuan , Ho Yeung Chan
发明人： Jie Yuan , Ho Yeung Chan
IPC分类号： H04N3/14 , H04N5/335 , H01L27/00
CPC分类号： H04N5/37455 , H04N5/35527 , H04N5/365 , H04N5/3658
摘要： Described herein is a circuit and related method for improving the dynamic range and the linearity characteristic of a CMOS image sensor. In various embodiments of the CMOS image sensor, a current sampler, a comparator, and a 1-bit memory are incorporated in each pixel circuit. In the image sensor, pixels are arranged in columns and a column slice is used to read the digital and analog singles from each column. In addition, a calibration circuit is incorporated in the sensor circuit for providing calibration current, which is used to generate calibration parameter. The image sensor operates in three non-overlapping modes: the difference mode, the WDR mode, and the calibration mode. The image sensor is switched among the three modes by control signals, which are provided to the image sensor by various control circuits. The image sensor normally operates in the difference mode and switches to the WDR mode when the difference between consecutive frames is over a threshold. The calibration mode allows the image sensor generate calibration parameters which are used to improve the linearity of the sensor through a interpolation method.
摘要翻译：这里描述了一种用于改善CMOS图像传感器的动态范围和线性特性的电路和相关方法。在CMOS图像传感器的各种实施例中，电流采样器，比较器和1位存储器被并入每个像素电路中。在图像传感器中，像素按列排列，列切片用于从每列读取数字和模拟单声道。此外，校准电路被并入传感器电路中，用于提供用于产生校准参数的校准电流。图像传感器以三种不重叠的模式操作：差模式，WDR模式和校准模式。通过控制信号在三种模式之间切换图像传感器，控制信号由各种控制电路提供给图像传感器。图像传感器通常在差模式下工作，当连续帧之间的差超过阈值时，图像传感器切换到WDR模式。校准模式允许图像传感器生成用于通过插值方法提高传感器线性度的校准参数。

2. 发明申请

US20100194956A1 Apparatus and method for improving dynamic range and linearity of CMOS image sensor 有权
标题翻译：提高CMOS图像传感器动态范围和线性度的装置和方法
公开(公告)号：US20100194956A1
公开(公告)日：2010-08-05
申请号：US12697061
申请日：2010-01-29
申请人： Jie Yuan , Ho Yeung Chan
发明人： Jie Yuan , Ho Yeung Chan
IPC分类号： H04N5/335
CPC分类号： H04N5/37455 , H04N5/35527 , H04N5/365 , H04N5/3658
摘要： Described herein is a circuit and related method for improving the dynamic range and the linearity characteristic of a CMOS image sensor. In various embodiments of the CMOS image sensor, a current sampler, a comparator, and a 1-bit memory are incorporated in each pixel circuit. In the image sensor, pixels are arranged in columns and a column slice is used to read the digital and analog singles from each column. In addition, a calibration circuit is incorporated in the sensor circuit for providing calibration current, which is used to generate calibration parameter. The image sensor operates in three non-overlapping modes: the difference mode, the WDR mode, and the calibration mode. The image sensor is switched among the three modes by control signals, which are provided to the image sensor by various control circuits. The image sensor normally operates in the difference mode and switches to the WDR mode when the difference between consecutive frames is over a threshold. The calibration mode allows the image sensor generate calibration parameters which are used to improve the linearity of the sensor through a interpolation method.
摘要翻译：这里描述了一种用于改善CMOS图像传感器的动态范围和线性特性的电路和相关方法。在CMOS图像传感器的各种实施例中，电流采样器，比较器和1位存储器被并入每个像素电路中。在图像传感器中，像素按列排列，列切片用于从每列读取数字和模拟单声道。此外，校准电路被并入传感器电路中，用于提供用于产生校准参数的校准电流。图像传感器以三种不重叠的模式操作：差模式，WDR模式和校准模式。通过控制信号在三种模式之间切换图像传感器，控制信号由各种控制电路提供给图像传感器。图像传感器通常在差模式下工作，当连续帧之间的差超过阈值时，图像传感器切换到WDR模式。校准模式允许图像传感器生成用于通过插值方法提高传感器线性度的校准参数。

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