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专利名称：Image sensor having improved moving
target discernment capabilities
发明人：Richard D. Nelson,A. James Hughes申请号：US05/857633申请日：19771205公开号：US04176369A公开日：19791127
摘要：A semiconductor image sensor comprises an array of charge collectionelements buried within the semiconductor for collecting charge photogenerated inresponse to the image. This sensor is easily configured to discern changes in an image.One or more charge transfer devices (CTD's) of an array are associated with each columnof charge collection elements. For readout, the charge collected by each charge
collection element is transferred to an associated storage cell of an array CTD associatedwith the column in which that charge collection element is disposed.
For discernment of moving targets or image changes, a difference between thecharge collected by a given charge collection element during a first frame and a secondframe is determined. To discern a moving target, each column of charge collectionelements has a first and a second array CTD associated therewith and a first image frameof charge is collected, transferred to and stored in the channels of the first array CTD's,after which a second image frame of charge is collected, transferred to and stored in thechannels of the second array CTD's. The charges in the first and second array CTD's arethen read out in parallel, thereby transferring the image frames in parallel. Output CTDchannels positioned to accept charge from the channels of the array CTD's have special
charge transfer control structures for transferring the charge from the channels of thearray's first CTD's to the channel of a first output CTD and from the channels of thearray's second CTD's to the channel of a second output CTD to ensure that paralleltransfer of the image frames continues in the output CTD's. This parallel in the array,parallel in the output (parallel-parallel) CTD transfer architecture minimizes interframecross-talk and maximizes resolution. Interleaved first and second array CTD's to whichcharge may be selectively transferred are achieved by splitting the propagationelectrodes for one phase into two electrodes each in order to control charge transferfrom the charge collectors to the first and second associated CTD's independently.
The CTD's (array and output together) may be combined with a prior art single-frame-at-a-time imager to form a system which appears (at the external system output)to be the same as the monolithic structure.
申请人：ROCKWELL INTERNATIONAL CORP
代理人：H. Fredrick Hamann,Gilbert H. Friedman
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