Solid-state image sensing device providing a logarithmically pro

Details Solid-state image sensing device providing a logarithmically pro Solid-state image sensing device providing a logarithmically pro

1992-09-09

1993-08-31

James, Andrew J.

Electrical pulse counters, pulse dividers, or shift registers: c

Charge transfer device

Particular input or output means

377 62, 257226, 257234, 257236, 257292, 257448, 257462, 257901, 307308, 307311, 307571, 307580, H01L 2978, H01L 2714, H01L 3100

Patent

active

052415759

ABSTRACT:
An image sensing device that outputs a signal logarithmically proportional to the intensity of the incident light. The image sensing device makes use of a sub-threshold current flowing between the drain and source of a MOS transistor when the gate voltage is below the threshold voltage (above which the MOS transistor is nominally conductive and below which nominally non-conductive). Since the logarithmic conversion is done in the photosensing section of a solid-state image sensing device, the output from the device is already compressed and is easily handled by a small capacity CCD. Some output systems for the image sensing device of the present invention are also described.

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