| 摘要 |
A sensor array comprising an array of pixels and a method of operating the same are disclosed. Each pixel of the sensor array comprises: a photodiode; a node arranged to develop a voltage based on charge accumulated at the photodiode due to photogeneration; and a first overflow unit 200 coupled to the node. The first overflow unit comprises a transistor and a capacitance. The sensor array is arranged to control the first overflow unit to accept overflow charge from the node into the capacitance of that overflow unit, and to subsequently read the overflow charge stored at the capacitance. Each pixel may comprise one or more further overflow units in series with the first overflow unit. The overflow units provide the sensor array with enhanced dynamic range. Also disclosed is a single pixel sensor with enhanced dynamic range. This arrangement results in a sensor array in which each pixel may have multiple capacitors. The arrangement also has readout circuitry 100 which can read the charge held by both the photodiode and overflow unit. |
