Photo-sensor circuit with shutter function and operating method

Details Photo-sensor circuit with shutter function and operating method Photo-sensor circuit with shutter function and operating method

2005-10-25

2005-10-25

Ho, Tuan (Department: 2615)

Television

Camera, system and detail

Solid-state image sensor

C348S297000, C348S248000, C348S300000

Reexamination Certificate

active

06958775

ABSTRACT:
A photo-sensor circuit according to an embodiment of the present invention comprises a photo-detecting element (PD) for detecting a light signal and converting the same signal into an electric signal, a first MOS transistor (QT) for charging and discharging parasitic capacitance (C1), a capacitor (C2) for accumulating a terminal voltage of the photo-detecting element as a pixel signal, a second MOS transistor (Q2) for transferring a parasitic capacitance charge from the photo-detecting element to the capacitor (C2), a third MOS transistor (Q3) for amplifying the terminal voltage of the capacitor and a fourth MOS transistor (Q4) for selectively outputting an amplified pixel signal. In the above structure, the first MOS transistor and the second MOS transistor are turned ON for a certain period of time before accumulation of a pixel signal to equalize terminal voltages of the photo-detecting element and the capacitor by charging and discharging the parasitic capacitance of the photo-detecting element and the capacitor, the second MOS transistor is turned OFF and the capacitor is open after a certain period of time of accumulation of the pixel signal and then the fourth MOS transistor is switched ON. This photo-sensor circuit offers an advantageous feature of producing a pixel signal having high reproducibility.

REFERENCES:
patent: 6046444 (2000-04-01), Afghahi
patent: 6191408 (2001-02-01), Shinotsuka et al.
patent: 6317154 (2001-11-01), Beiley

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