Via wave guide with cone-like light concentrator for image sensing devices
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United States of America Patent
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Issued Date -
Aug 30, 2007
app pub date -
Feb 24, 2006
filing date -
Feb 24, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A CMOS image sensor (CIS) device includes an array of pixels, each pixel including a sensing element (e.g., a photodiode) and access circuitry. To facilitate the passage of light to the photodiode, each pixel includes a via wave guide (VWG) defined in the metallization layer formed over the pixel's photodiode. The VWG includes an upper light concentrator having a cone-like surface (e.g., having a tapered roundish or polygonal cross-section) extending from a relatively wide upper opening to a relatively small lower opening. The VWG also includes an optional lower section extending between the lower opening of the light concentrator and the associated photodiode. A mirror coating is optionally formed on the surface of the VWG. An optional light-guiding material and/or color filter materials are disposed inside the VWG. An optional microlens is formed over the VWG.
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