Color filter array, imagers and systems having same, and methods of fabrication and use thereof
View Patent ↗A pixel cell with a photosensitive region formed in association with a substrate, a color filter formed over the photosensitive region, the color filter comprising a first material layer and a second material layer formed in association with the first shaping material layer.
1. A processor system, comprising:
a processor; and
an imager coupled to the processor, the imager comprising;
a pixel cell array formed in a substrate, the pixel cell array having an array of at least first, second, and third photosensors;
a color filter array comprising at least first, second, and third color filters corresponding to the first, second, and third photosensors, each of the first, second, and third color filters comprising respective first, second, and third conforming layers formed over first, second, and third base structures with different heights, wherein:
at least one of the color filters has a conforming layer having a middle portion lower than an edge of the conforming layer, and
the base structures are separated by one or more distances along a horizontal plane by a plurality of spacers, wherein a height of each of the plurality of spacers is substantially the same as the second base structure and higher than the first base structure; and
a microlens array formed over the color filter array.
2. The processor system of claim 1 , wherein the first, second, and third base structures have respective first, second, and third heights, and wherein the first, second, and third heights are different from one another.
3. The processor system of claim 2 , wherein the first, second, and third conforming layers have respective first, second, and third radius of curvatures, and wherein the first, second, and third radius of curvatures are different from one another.
4. The processor system of claim 3 , wherein the first, second, and third radius of curvatures have corresponding first, second, and third focal lengths, each corresponding to a different depth of respective photosensors.
5. The processor system of claim 1 , wherein the processing system is a digital camera system.
6. The processor system of claim 5 , wherein the processing system is a video camera system.
7. The processor system of claim 5 , wherein the processing system is a still camera system.
8. The processor system of claim 1 , wherein at least one of the first, second, and third conforming layers has a shape defined at least in part by the respective base material and the corresponding spacer structure.
9. The processor system of claim 1 , wherein one of the first, second, and third base structures has a different width than the other two of the first, second, and third base structures.