Patent ID: 9749553
Date: 2017-08-29
CPC Classifications: H01L,H04N

Claim:
1. An imaging system, comprising: a first image sensor having a first plurality of photodiodes, wherein the first plurality of photodiodes are formed in a first semiconductor layer, wherein the first image sensor comprises visible imaging pixels and upper infrared imaging pixels, and wherein each of the visible imaging pixels and the upper infrared imaging pixels includes one of the photodiodes in the first plurality of photodiodes; a second image sensor having a second plurality of photodiodes, wherein the second plurality of photodiodes are formed in a second semiconductor layer, wherein the first image sensor is stacked on top of and bonded to the second image sensor, wherein the second image sensor comprises lower infrared imaging pixels, wherein each of the lower infrared imaging pixels includes one of the photodiodes in the second plurality of photodiodes, and wherein the upper infrared imaging pixels directly overlap the lower infrared imaging pixels; a microlens array formed over the first and second pluralities of photodiodes; and an array of filter elements interposed between the microlens array and the first semiconductor layer, wherein the array of filter elements comprises color filter elements formed over at least some of the first plurality of photodiodes and infrared filter elements formed over the second plurality of photodiodes, wherein the color filter elements transmit visible light, and wherein the infrared filter elements transmit infrared light.