Single MOS transistor active pixel sensor cell with automatic an

Details Single MOS transistor active pixel sensor cell with automatic an Single MOS transistor active pixel sensor cell with automatic an

1995-09-20

1996-12-24

Tran, Minhloan

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Charge transfer device

257290, 257291, 257292, 257445, 257462, H01L 31062

Patent

active

055875963

ABSTRACT:
The size of an active pixel sensor cell is reduced by utilizing a single MOS transistor formed in a well to perform the functions conventionally performed by a photogate/photodiode, a sense transistor, and an access transistor. Light energy striking the well varies the potential of the well which, in turn, varies the threshold voltage of the transistor. As a result, the current sourced by the transistor is proportional to the received light energy.

REFERENCES:
patent: 5191398 (1993-03-01), Mutoh
patent: 5289023 (1994-02-01), Mead
"A Randon Access Photodiode Array for Intelligent Image Capture", IEEE Transactions of Electron Devices, vol. 38, No. 8, Aug. 1991, Pecht et al.
Fossum, Eric R., "Active-Pixel Sensors Challenge CCDs", Laser Focus World, Jun. 1993, pp. 83-87.
Dickinson, A. et al., "tp 13.5: A 256.times.256 CMOS Active Pixel Image Sensor with Motion Detection", ISSCC95/SESSION 13/IMAGE SENSORS AND SYSTEMS/ PAPER TP 1., 1995.

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