Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-04-12
1994-09-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
257443, H01J 4014
Patent
active
053491742
ABSTRACT:
The image sensor (1a) has a transparent substrate (2) supporting a two dimensional array (3) of photosensitive and switching elements (4) with switching signal conductors (5) and data signal conductors (6) connected to the photosensitive and switching elements (4) for enabling individual photosensitive elements to be accessed. The photosensitive and switching elements (4) and the conductors (5 and 6) are arranged such that at least half of the area of the image sensor is transparent during operation. Each photosensitive element is electrically coupled to a respective capacitor (7) for storing charge generated as a result of light being incident on the photosensitive element. The capacitors (7) are formed so as to be transparent and so as to occupy a significant part of the entire area of the array (3). The transparent capacitors act effectively to increase the sensitivity of the photosensitive elements by enabling a high quantity of charge to be stored in response to light incident on the photosensitive elements so enabling the photosensitive elements (4) to be quite small while still providing sufficient signal to enable high accuracy in the sensing of an image.
REFERENCES:
patent: 3862360 (1975-01-01), Dill et al.
patent: 4388532 (1981-04-01), Garcia
patent: 4448491 (1980-08-01), Okubo
B. J. Lechner et al., "Liquid Crystal Matrix Displays", Proceedings of the IEEE, vol. 59, No. 11, Nov. 1971, pp. 1566-1579.
Bird Neil C.
Davies Oliver S.
Edwards Martin J.
Knapp Alan G.
Shannon John M.
Goodman Edward W.
Nelms David C.
U.S. Philips Corporation
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