Television – Camera – system and detail – Combined image signal generator and general image signal...
Reexamination Certificate
1995-03-27
2001-07-24
Garber, Wendy R. (Department: 2612)
Television
Camera, system and detail
Combined image signal generator and general image signal...
C348S312000, C348S314000, C348S317000, C257S223000, C257S230000, C257S247000
Reexamination Certificate
active
06266087
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to image sensors, and more specifically to charge coupled devices.
BACKGROUND OF THE INVENTION
Smear is an unwanted phenomenon in charge coupled device (CCD) image sensors which occurs when charge is transferred from the image sensing area to the memory area. Smear is the result of charge generation in the imaging area during this transfer. Since the charge transfer speed is finite, charge generated by a bright source is added to the wrong pixels during the transfer. As charge from a particular pixel in the image area is shifted through other pixels on the way to the memory area, the light source continues to generate additional charge in these other pixels. This additional charge adds to the original amount of charge to distort the image signal. Smear is the result of this additional charge.
SUMMARY OF THE INVENTION
Generally, and in one form of the invention, the image sensing device includes an image sensing area having an antiblooming drain structure; and a frame memory area coupled to the image sensing area for storing charge from the image sensing area, wherein during charge integration, the antiblooming drain is biased at a first level, and during charge transfer to memory, the antiblooming drain is biased at a second level such that the image sensing area will a higher charge capacity than during the charge integration.
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Fritz Matthew J.
Hynecek Jaroslav
Brady III Wade James
Garber Wendy R.
Stewart Alan K.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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