Patent ID: 7892628

Claim:
An image sensor comprising: color filters formed on a central portion of a pixel array and an edge portion of the pixel array, wherein an incident angle of a light to the edge portion is greater than that of a light to the central portion; an over-coating layer formed on the color filters; a plurality of microlenses formed on the over-coating layer such that the microlenses of the plurality of microlenses correspond to the color filters, wherein the plurality of microlenses include a first plurality of microlenses formed over the central portion and a second plurality of microlenses formed over the edge portion; a medium layer covering the second plurality of microlenses over the edge portion but not covering the first plurality of microlenses over the central portion, wherein the medium layer has a refractive index higher than that of air; and a capping layer covering a resultant structure, wherein the resultant structure includes the medium layer over the edge portion and the first plurality of microlenses over the central portion.