Patent ID: 8963091
Filing Date: 2015-02-24
Classification: G01J,H04N

Abstract:
1. A read-out integrated circuit (ROIC) of an infrared sensor, comprising: a cell array configured such that bolometers that detect infrared rays and output signal currents are arranged in an N×M matrix; a level generator configured to output a plurality of bias voltages corresponding to a plurality of bias levels; N non-uniformity correction (NUC) units disposed in a column direction of the cell array, and configured to supply different bias voltages to the respective bolometers; M NUC units disposed in a row direction of the cell array, and configured to supply different bias voltages to the respective bolometers; a control unit configured to set a bias voltage level of each of the NUC units in order to correct resistance non-uniformity of the cell array; and N integrators configured to integrate the signal currents output from the cell array; wherein the control unit: sequentially sets a plurality of resistance correction values, so that bias voltages corresponding to the resistance correction values are sequentially set for the respective bolometers, measures output voltages of the bolometers for each bias voltage, and selects and stores a resistance correction value at which a reference output voltage, is measured as an average of the output voltages; and when power is applied, sets corresponding bias voltages for the bolometers in accordance with the stored resistance correction values.