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backside illuminated (BSI)

The terms Backside Illuminated (BSI) and Frontside Illuminated (FSI) refer to the light guidance in digital cameras and smartphone

cameras. This refers to the direction from which the light

hits theimage sensor. In the case of Backside Ill

uminated,the image sensor with its light-sensitive structures is located directly behind the microlens and color filters, resulting in more light hitting the light-sensitive photodiodes

, givingthem better pixel performance, especially in low-light conditions.

Frontside Illuminated is a different story. With this commonly used technique, the light path to the light-sensitive photodiodes may be restricted or there may be interference between the conduction structure, located at the top of the image sensor, and the microlens.

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Englisch: backside illuminated - BSI
Updated at: 27.11.2013
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Translations: DE