专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

US20090295965A1 METHOD AND CIRCUIT FOR DRIVING ACTIVE PIXELS IN A CMOS IMAGER DEVICE 审中-公开
标题翻译：用于在CMOS成像器件中驱动有源像素的方法和电路
公开(公告)号：US20090295965A1
公开(公告)日：2009-12-03
申请号：US12129900
申请日：2008-05-30
申请人： Desmond Yu Hin Cheung , Amit Mittra , Chi-Shao Lin
发明人： Desmond Yu Hin Cheung , Amit Mittra , Chi-Shao Lin
IPC分类号： H04N5/335 , H01L27/146
CPC分类号： H04N5/3745 , H01L27/14641 , H04N5/357
摘要： One embodiment of the present invention describes a pixel circuit that comprises at least one photodiode, a first transistor coupled between the photodiode and a floating diffusion node, a second transistor coupled between the floating diffusion node and a modifiable driving voltage signal, and a third transistor having a gate coupled to the floating diffusion node, a source coupled to a signal output, and a drain coupled to a constant voltage. Another embodiment of the present invention provides a method for driving the pixel circuit, which comprises resetting the photodiode and the floating diffusion node, exposing the photodiode to light to accumulate charges, selecting the pixel circuit by switching the driving voltage signal from a first voltage level to a second voltage level, retrieving a reference voltage from the selected pixel circuit, and retrieving an image signal from the selected pixel circuit corresponding to the accumulated charges.
摘要翻译：本发明的一个实施例描述了一种像素电路，其包括至少一个光电二极管，耦合在光电二极管和浮动扩散节点之间的第一晶体管，耦合在浮动扩散节点和可修改驱动电压信号之间的第二晶体管，以及第三晶体管具有耦合到浮动扩散节点的栅极，耦合到信号输出的源极和耦合到恒定电压的漏极。本发明的另一个实施例提供了一种用于驱动像素电路的方法，该方法包括复位光电二极管和浮动扩散节点，将光电二极管暴露于光以累积电荷，通过从第一电压电平切换驱动电压信号来选择像素电路获取第二电压电平，从所选择的像素电路检索参考电压，以及从对应于累积电荷的所选择的像素电路中检索图像信号。

IPRDB

热门服务

关于我们

友情链接

联系方式