PHOTODETECTING DEVICE WITH PHOTODETECTORS WITH VERTICAL COLOUR SEPARATION Russian patent published in 2009 - IPC H01L27/146 

FIELD: information technology.

SUBSTANCE: invention relates to machine vision technology and can be used in high resolution video cameras and still cameras which use digital processing for optimising signals. The photodetecting device contains a signal processing device which corrects characteristics of colour channels based on their correlation, photodetector cells with vertical colour separation, each of which contains a reading circuit, detectors for blue, green and red components of received radiation, made in a semiconductor structure, with horizontal areas of first type of conductivity, lying on first, second and third depths with respect to the surface of the structure, respectively optimised on maximum absorption of blue, green and red radiation components, connected through p-n junctions by areas of first and/or second, opposite the first, type of conductivity with the near-surface areas of the second type of conductivity, surrounded by areas of the first type of conductivity with distribution of concentration of impurities, which creates a potential barrier for movement of minority current carriers in them. The following is proposed: a horizontal area, lying at the third depth, making a layer for all cells on the substrate with first type of conductivity, carry out correction of space-frequency characteristics for the red channel, spectral characteristics of blue, green and red colour channels in the signal processing device, suppression of specified spatial colour noise, regulate sharpness and depth taking into account technologically restricted spatial bands of the red component.

EFFECT: simpler technology, reduced cost while maintaining good characteristics of the photodetecting device due cheap digital correction of signals based on high correlation dependence of characteristics of colour components.

2 dwg