Capacitive coupled bipolar active pixel imager having overflow p

Details Capacitive coupled bipolar active pixel imager having overflow p Capacitive coupled bipolar active pixel imager having overflow p

1997-05-29

2000-07-11

Garber, Wendy

Television

Camera, system and detail

Solid-state image sensor

348362, 257291, H04N 314, H04N 9083, H04N 5335, G03B 700

Patent

active

060880589

ABSTRACT:
An imaging array having overflow protection and electronic shuttering features is realized without an increase in pixel complexity. Overflow protection is provided by pulsing each row of the imager with a small overflow pulse during the sense amplifier reset phase. An electronic shutter is realized using a modified version of the pixel readout timing. The shutter provides sub-frame exposure by restricting the number of line-times a pixel is allowed to integrate. For a full-frame exposure, each pixel is read out once per frame; during readout of the other rows of the array, the pixel integrates. For subframe exposure, the pixel is continually reset, using a shutter pulse applied to the row lines during sense amplifier reset, until a certain number of rows (line-times) before it is to be read out. The pixel then is allowed to integrate until it is read out normally.

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Theuwissen, A., "Solid-State Imaging for Television Applications," Solid-State Imaging with Charge-Coupled Devices, Chapter 6, pp. 176-191 (1995).

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