Sensors Back-Lit, What They Are and What Benefits Have

We are seeing them, increasingly, in many of the cameras presented during the last few days. Brands are embracing this technology gradually but although it seems a novelty of 2010 by the number of models that are including them, the backlit sensors Sony introduced them over the past year, under the name of Sony Exmor R.

The first cameras to adopt them were the Sony TX1 and WX1, but gradually other brands have gone them adopting, first Casio with its EX-FH25 and EX-FC150 and early 2010 as several brands are which include them in their models.

Ricoh, Fujifilm, Nikon, and many others that are yet to come, but what is a backlit sensor?

Backlit sensors: what are

Without going into many technical terms, conventional sensors, and that we have been using until now, have a design in which the “ circuitry ” sensor is placed ahead of the photodiodes, which are ultimately those who capture the light. To be in front of them, part of the light which should arrive, is bounced off and never arrive at their destination, finally reducing the amount of light that gets the sensitive part.

However, this backlit sensors set of circuits is placed behind the photodiodes, with the direct consequence that does not stand in the light that you have to get them.

Backlit sensors: what benefits have

Well all this is very well, very nice, but would that affect me me all this?

In bad light the sensor’s signals have to be electronically enhanced to compensate for the loss of light that reaches them and this causes noise and low definition images.

Greater amount of light reaching the photodiodes therefore has directly on the quality of image involved, since the sensors perform better in bad light conditions obtaining less noise and better defined images.

Although we are seeing it mostly in photo cameras, video cameras are also benefiting from this type of sensors, so it is not surprising that they begin to appear more and more models on the market in the near future.

For the curious, I leave you with a video in which the own Sony explains how your sensor, which although it is in English, is fairly well understood: