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In the BSI approach, OmniVision's traditional CameraChip sensor is turned upside down so that it collects light through what was previously the backside of the sensor, the silicon substrate. This approach differs from conventional FSI image sensors, where the amount of light reaching the photosensitive area is limited by the multiple metal and dielectric layers required to enable the sensor to convert photons into electrons.

Image Credit: OmniVision

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