Patent ID: 8970768
Filing Date: 2015-03-03
Classification: H01L

Abstract:
1. A unit pixel array, comprising: a semiconductor substrate having a plurality of unit pixels; an interlayer insulating layer including at least one gate terminal of a transistor and at least one conductive line on a front side of the semiconductor substrate; a plurality of color filters on a back side of the semiconductor substrate; a plurality of light path converters, each of the light path converters being adjacent to at least one color filter, and having a pair of slanted side edges on opposing ends of a horizontal bottom edge; an anti-reflective layer between the color filters and the back side of the semiconductor substrate, the anti-reflective layer passing incident light and preventing the incident light from reflecting on the back side of the semiconductor substrate; and a plurality of micro lenses on the color filters, wherein a distance between opposing slanted side edges of adjacent light path converters is greater than a distance between the pair of slanted side edges of each of the light path converters and wherein each slanted side edge of the pair of slanted side edges of each of the light path converters extends at a same angle from an uppermost surface to a lowermost surface of the at least one color filter, wherein: the light path converters are reflective bodies that reflect the incident light, the reflective bodies include silicon (Si), titanium (Ti), titanium nitride (TiN), aluminum (Al), copper (Cu), tungsten (W), or combinations thereof, and the reflective bodies have a triangular cross section or a trapezoidal cross section.