Interline CCD implementation of hybrid two color per pixel architecture
View Patent ↗An image sensor includes at least first and second photo-sensitive regions; a color filter array having at least two different colors that selectively absorb specific bands of wavelengths, and the two colors respectively span portions of predetermined photo-sensitive regions; and wherein the two photo sensitive regions are doped so that electrons that are released at two different depths in the substrate are collected in two separate regions of the photo sensitive regions so that, when wavelengths of light pass through the color filter array, light is absorbed by the photo sensitive regions which photo sensitive regions consequently releases electrons at two different depths of the photo sensitive regions and are stored in first and second separate regions; at least two charge-coupled devices adjacent the first photo sensitive regions; and a first transfer gate associated with the first photo sensitive region that selectively passes charge at first and second levels which, when at the first level, causes the charge stored in the first region to be passed to one of its associated charge-coupled devices, and when the transfer gate is at the second level, charge stored in the second region is passed to one of the associated charge-coupled devices.
1. An image sensor comprising:
(a) at least first and second photosensitive regions;
(b) a color filter array having at least two different colors that selectively absorb specific bands of wavelengths of light, and the at least two colors respectively span portions of predetermined photosensitive regions;
wherein the first photosensitive region is doped so that charge representing one color is collected and stored in one depth region of the first photosensitive region and charge representing a different color is collected and stored at a separate depth region of the first photosensitive region and the second photosensitive region is doped so that charge representing one color is collected and stored in at least one depth region of the second photosensitive region;
(c) at least a first charge-coupled device and a second charge-coupled device adjacent the first photosensitive region;
(d) at least a third charge-coupled device and a fourth charge-coupled device adjacent the second photosensitive region;
(e) at least two transfer gates associated with the first photosensitive region, wherein a first transfer gate selectively passes the charge representing the one color to the first charge-coupled device when energized at one voltage level and a second transfer gate selectively passes the charge representing the different color to the second charge-coupled device when energized at a different voltage level; and
(f) at least two transfer gates associated with the second photosensitive region, wherein a third transfer gate selectively passes the charge representing the one color to the third charge-coupled device when energized at one voltage level and a fourth transfer gate selectively passes the charge representing the one color to the fourth charge-coupled device when energized at a different voltage level.