Image sensor for compensating for signal difference between pixels

An image sensor, comprising:

• a first phase-difference detection pixel and a second phase-difference detection pixel directly adjacent to the first phase-difference detection pixel in a first direction, the first and second phase-difference detection pixels being formed in a first row;
• a first peripheral pixel disposed from the first phase-difference detection pixel in a second direction perpendicular to the first direction;
• a second peripheral pixel disposed from the second phase-difference detection pixel in the second direction;
• and
• a plurality of microlens formed on the first and second phase-difference detection pixels,
• wherein the first and second peripheral pixels are formed in a second row next to the first row,
• wherein the microlens expands toward a space between the first and second peripheral pixels so that a part of the microlens is formed in the second row,
• wherein the first and second phase-difference detection pixels are surrounded by a plurality of adjacent pixels,
• wherein the plurality of adjacent pixels includes the first and second peripheral pixels, and
• wherein the plurality of adjacent pixels has at least three green filters, at least one red filter, and at least one blue filter.