Image sensor including auto-focus pixels

An image sensor comprising:

• a pixel array including a first normal pixel group, a second normal pixel group, a first AF pixel group, and a second AF pixel group,
• wherein each of the first normal pixel group and the second normal pixel group includes at least one normal pixel having a same color filter,
• each of the first AF pixel group and the second AF pixel group includes AF pixels having a same color filter,
• the first normal pixel group and the first AF pixel group are adjacent in a first direction,
• the second AF pixel group and the second normal pixel group are adjacent in the first direction,
• each of the AF pixels includes at least two photodiodes,
• a first length of the first AF pixel group in the first direction is greater than a first length of the first normal pixel group in the first direction,
• a first length of the second AF pixel group in the first direction is greater than a first length of the second normal pixel group in the first direction,
• each of the first AF pixel group and the second AF pixel group has an octagonal shape,
• a second length of the first AF pixel group in a second direction intersect with the first direction is greater than a second length of the first normal pixel group in the second direction, and
• a second length of the second AF pixel group in the second direction is greater than a second length of the second normal pixel group in the second direction.

An image sensor comprising:

• a pixel array including pixels arranged in a first direction and a second direction, wherein the pixels include a first normal pixel, a second normal pixel, a first AF pixel and a second AF pixel,
• wherein each of the first normal pixel and the second normal pixel includes a single photodiode and a microlens,
• each of the first AF pixel and the second AF pixel includes at least two photodiodes and a microlens,
• the first normal pixel and the first AF pixel are adjacent in the first direction,
• the second AF pixel and the second normal pixel are adjacent in the first direction,
• the first normal pixel and the second AF pixels are adjacent in the second direction,
• a size of the first AF pixel is greater than a size of the first normal pixel,
• a size of the second AF pixel is greater than a size of the second normal pixel,
• each of the first AF pixel and the second AF pixel has an octagonal shape,
• a second length of the first AF pixel in the second direction is greater than a second length of the first normal pixel in the second direction, and
• a second length of the second AF pixel in the second direction is greater than a second length of the second normal pixel in the second direction.