Omnivision Proposes BSI Sensor with No Color Filter

Omnivision patent application US20140084135 "Backside-Illuminated Photosensor Array With White, Yellow ad Red-Sensitive Elements" by Gang Chen, Duli Mao, Hsin-Chih Tai proposes to use different PD depths in BSI sensor to get pixels sensitive to white (PD extends all the way to the backside), Yellow, and Red (shallow PD). I'm not sure what are the advantages of this approach, but it's a simple and nice idea:

Omnivision Proposes BSI Sensor with No Color Filter
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