Solid state image sensor array having photochromic layer surroun

Details Solid state image sensor array having photochromic layer surroun Solid state image sensor array having photochromic layer surroun

1994-10-27

1996-12-03

Razavi, Michael T.

Television

Camera, system and detail

Solid-state image sensor

348207, 348340, 348902, 348273, H04N 5335, H04N 314

Patent

active

055813003

ABSTRACT:
A solid state image sensor is provided having a vertical charge transfer unit, a horizontal charge transfer unit, a photoelectric conversion unit including a plurality of photoelectric conversion elements arranged in a matrix manner, each photoelectric conversion element having a photodiode and switching MOS transistors to output a signal accumulated in the photodiode, and a charge accumulation controller for controlling a charge accumulated by each photodiode in logarithmical proportion to the quantity of light incident on each corresponding photoelectric conversion element corresponding to one pixel. The charge accumulation controller includes a photochromic color filter layer made of a photochromic material. Alternatively, the charge accumulation controller includes a photochromic layer which is formed over an existing color filter layer at a light receiving window area. With this construction, the quantity of light incident on a surface to be image-scanned is not controlled based on the average illumination of an image, but based on the unit of the photoelectric conversion element corresponding to one pixel. Accordingly, it is possible to prevent degradation in image quality at dark areas relative to light areas upon photographing an object including the dark and light areas.

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Keiji Tanaka Mar. 31, 1987 Light intensity dependence of Photodarkening in Amorphous As.sub.2 S.sub.3 Films.

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