IMAGE SENSOR HAVING IMPROVED LIGHT UTILIZATION EFFICIENCY

摘要

An image sensor is provided including a photo sensor layer including a plurality of photo-sensing cells; a color separation layer disposed on the photo sensor layer and including color separation elements embedded in a transparent spacer layer; and a micro lens array arranged on the color separation layer, the micro lens array including a plurality of micro lenses. The color separation layer separates light by wavelength. The micro lens array concentrates incident light onto the plurality of color separation elements. The color separation elements include: a first main splitter which transmits light of a first primary color onto first photo-sensing cells which faces the first main splitter and diffracts and/or refracts light of colors other than the first primary color onto photo-sensing cells adjacent to the first photo-sensing cell; and a plurality of first auxiliary splitters which are arranged surrounding the first main splitter.

主权项

1. An image sensor comprising:
a photo sensor layer comprising a two-dimensional array of a plurality of photo-sensing cells; a color separation layer disposed on the photo sensor layer, the color separation layer comprising a transparent spacer layer and color separation elements disposed within the transparent spacer layer, wherein the color separation layer separates light incident thereon according to wavelength; and a micro lens array disposed on the color separation layer, the micro lens array comprising a two-dimensional array of a plurality of micro lenses, wherein each of the plurality of micro lenses concentrates light incident thereon onto one of the plurality of color separation elements, wherein the plurality of color separation elements comprise: a first main splitter which transmits light of a first primary color, without diffraction or refraction, onto a first photo-sensing cell and which diffracts and/or refracts light of mixed colors, other than the first primary color, onto photo-sensing cells adjacent to the first photo-sensing cell; and a plurality of first auxiliary splitters which are arranged around the first main splitter.