Exmor is the name of a technology SONY implemented on some of their CMOS image sensors. It performs on-chip analogue/digital signal conversion and two-step noise reduction in parallel on each column of the CMOS sensor.

Exmor R is a back-illuminated version of SONY's CMOS image sensor. Exmor R usage is limited to smaller sensors for camcorders, compact cameras and mobile phones. It was announced by SONY on 11 June 2008 and was the world's first mass-produced implementation of the back-illuminated sensor technology SONY claims that Exmor R is approximately twice as sensitive as a normal front illuminated sensor. This active pixel sensor is found in several SONY mobile phones and cameras as well as Apple's iPhone 4S and 5. The Exmor R sensor allows the camera of the smartphone to capture high definition movies and stills in low lit areas.

Variety of high end smartphone manufacturers uses SONY’s Exmor imaging Sensors. This includes the latest IPhone 6 and the Samsung Galaxy S6 for a better picture quality.

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Article source: wikipedia.com