Patent ID: 8947572
Filing Date: 2015-02-03
Classification: H01L

Abstract:
1. A dual-sided image sensor including a pixel array, wherein each pixel of the pixel array comprises: a photosensitive region disposed within a single epitaxial layer; a metal stack disposed over a frontside of the single epitaxial layer and including an optical path through the metal stack to the photosensitive region for passing frontside incident light to the photosensitive region; a backside microlens disposed over a backside of the single epitaxial layer to direct backside incident light to the photosensitive region; pixel circuitry coupled to the photosensitive region to capture frontside image data and backside image data from the photosensitive region; and readout circuitry coupled to the pixel array to readout the frontside image data and the backside image data as a combination overlay image that combines the frontside image data with the backside image data, wherein the photosensitive region disposed within the single epitaxial layer receives light through the backside and the frontside of the single epitaxial layer.