TFT-drive image sensor capable of producing an offset-free image

Details TFT-drive image sensor capable of producing an offset-free image TFT-drive image sensor capable of producing an offset-free image

1995-09-08

1996-07-23

Greening, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

H04N 964

Patent

active

055394582

ABSTRACT:
A number of photodiodes are arranged in line and dark output generating diodes are associated with the respective photodiodes. The light incident side of each dark output generating diode is shielded by a metal film. Two thin-film transistors are respectively connected to the photodiode and the dark output generating diode to transfer charges generated in the respective diodes. A capacitor is connected between the sources of the two thin-film transistors, and stores charges corresponding to the difference between the charges transferred through the two thin-film transistors, i.e., charges generated in the photodiode in response to incident light. Alternatively, the charges transferred through the two thin-film transistors are respectively stored in first and second capacitors, and charges corresponding to the difference between the charges of the first and second capacitors are obtained by a differential amplifier and stored in a third capacitor.

REFERENCES:
patent: 4293877 (1981-10-01), Tsunekawa et al.
patent: 4484223 (1984-11-01), Tsunekawa
patent: 5117099 (1992-05-01), Schmidt
patent: 5162912 (1992-11-01), Ueno et al.
patent: 5235174 (1993-08-01), Ikeda et al.

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