公开(公告)号：US08508629B2

公开(公告)日：2013-08-13

申请号：US13736851

申请日：2013-01-08

Applicant: OmniVision Technologies, Inc.

Inventor： Yaowu Mo ,  Chen Xu

IPC: H04N9/64 ,  G03F3/08

CPC classification number: H04N5/361 ,  H04N5/3658 ,  H04N5/378

Abstract: A CMOS image sensor includes an image pixel array, a dark pixel array, data bit liens, reference bit lines, a driver, comparators, and analog-to-digital converter (“ADC”) circuits. The image pixel array generates analog image signals in response to incident light. The dark pixel array generates analog black reference signals for analog black level calibration of the analog image signals. In one embodiment, the data bit lines each coupled to a different column of image pixels of the image pixel array and the reference bit lines each coupled to a different column of black reference pixels within the dark pixel array. The driver is coupled to the reference bit lines to drive an analog black reference signal. The comparators each couple to one of the data bit lines and each coupled to an output of the driver and offset the analog image signals with the analog black reference signals in an analog domain. The ADC circuits each coupled to an output of a comparator.

Abstract translation: CMOS图像传感器包括图像像素阵列，暗像素阵列，数据位留置，参考位线，驱动器，比较器和模数转换器（“ADC”）电路。 图像像素阵列响应于入射光产生模拟图像信号。 暗像素阵列产生用于模拟图像信号的模拟黑电平校准的模拟黑参考信号。 在一个实施例中，每个耦合到图像像素阵列的不同列的图像像素的数据位线和每个耦合到暗像素阵列内的不同列的黑色参考像素的参考位线。 驱动器耦合到参考位线以驱动模拟黑色参考信号。 比较器每个耦合到数据位线中的一个，并且每个耦合到驱动器的输出，并且以模拟域中的模拟黑色参考信号偏移模拟图像信号。 ADC电路各自耦合到比较器的输出端。

公开(公告)号：US20130120619A1

公开(公告)日：2013-05-16

申请号：US13736851

申请日：2013-01-08

Applicant: OmniVision Technologies, Inc.

Inventor： Yaowu Mo ,  Chen Xu

IPC: H04N5/361

CPC classification number: H04N5/361 ,  H04N5/3658 ,  H04N5/378

Abstract: A CMOS image sensor includes an image pixel array, a dark pixel array, data bit liens, reference bit lines, a driver, comparators, and analog-to-digital converter (“ADC”) circuits. The image pixel array generates analog image signals in response to incident light. The dark pixel array generates analog black reference signals for analog black level calibration of the analog image signals. In one embodiment, the data bit lines each coupled to a different column of image pixels of the image pixel array and the reference bit lines each coupled to a different column of black reference pixels within the dark pixel array. The driver is coupled to the reference bit lines to drive an analog black reference signal. The comparators each couple to one of the data bit lines and each coupled to an output of the driver and offset the analog image signals with the analog black reference signals in an analog domain. The ADC circuits each coupled to an output of a comparator.

Abstract translation: CMOS图像传感器包括图像像素阵列，暗像素阵列，数据位留置，参考位线，驱动器，比较器和模数转换器（“ADC”）电路。 图像像素阵列响应于入射光产生模拟图像信号。 暗像素阵列产生用于模拟图像信号的模拟黑电平校准的模拟黑参考信号。 在一个实施例中，每个耦合到图像像素阵列的不同列的图像像素的数据位线和每个耦合到暗像素阵列内的不同列的黑色参考像素的参考位线。 驱动器耦合到参考位线以驱动模拟黑色参考信号。 比较器每个耦合到数据位线中的一个，并且每个耦合到驱动器的输出，并且以模拟域中的模拟黑色参考信号偏移模拟图像信号。 ADC电路各自耦合到比较器的输出端。