Pixel cell and its method for applying voltage generated in a photosensor to a gate capacitance and alternately resetting the applied voltage

摘要

A pixel cell, and a method of use thereof, the pixel cell including: an output, a photosensor configured to generate a first measuring current in a first measurement cycle and a second measuring current in a second measurement cycle as a function of radiation, an output node, a power storage device configured so that in a first operating mode a current can be injected by the power storage device as a function of the first measuring current, and so that in a second operating mode the power storage device is configured to hold the injected current so that the injected current can be detected at the output node, and a switching unit configured to form a difference between the injected current and the second measuring current at the output node in a reading cycle and to couple the output node to the output.

主权项

1. A pixel cell comprising:
a photosensor designed to generate a voltage over the photosensor dependent on a radiation; a first transistor designed to apply the voltage generated in the photosensor to a gate capacitance in order to store the voltage by the gate capacitance; a second transistor designed to reset the voltage on the gate capacitance to a reset voltage; a third transistor, at whose gate the gate capacitance is formed and designed to generate a voltage dependent on a voltage line on the gate capacitance and a source current on a source output of the third transistor; a fourth transistor designed to couple the source output to an output; and a fifth transistor designed to reset alternately the voltage via photosensor to a stipulated reference potential or decouple it from a given reference potential.