| CPC H10F 39/8053 (2025.01) [H04N 25/704 (2023.01); H10F 39/024 (2025.01); H10F 39/182 (2025.01); H10F 39/8063 (2025.01); H10F 39/807 (2025.01)] | 20 Claims |
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1. An image sensor, comprising:
a substrate that includes a first surface and a second surface that oppose each other in a first direction, and a plurality of pixel areas arranged in directions parallel to the first surface;
a first device isolation film that separates each of the plurality of pixel areas;
four photodiodes disposed in each of the plurality of pixel areas inside of the substrate, and arranged in 2×2 array in directions parallel to the first surface;
a second device isolation film that separates the four photodiodes from each other;
a color filter disposed on the first surface of the substrate, wherein the color filter includes four regions that correspond to the four photodiodes, respectively, wherein each of the four regions has a convex upper surface; and
a first microlens disposed above the color filter and that corresponds to each of the plurality of pixel areas, wherein the first microlens has a convex upper surface and a concave lower surface whose curvature conforms to a curvature of an upper surface of a layer below the first microlens,
wherein, in a direction parallel to the direction in which the pixel areas are arranged, a first length of the first microlens is twice a diameter of the circular convex upper surface of each of the four regions, and
wherein in a direction that is diagonal to the direction in which the pixel areas arranged, a second length of the first microlens is greater than twice the diameter of a circular convex upper surface of each of the four regions.
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