CMOS image sensor cell design improves colour accuracy

July 26, 2018 // By Julien Happich
During the Mobile World Congress Shanghai held last June, Samsung Electronics introduced its new ‘ISOCELL Plus’ technology, which the company claims allows CMOS image sensors to capture more light, significantly increasing light sensitivity and colour fidelity.

To take high-quality photographs, CMOS image sensors need to hold as much light, or photons, as possible and transmit the right colour information to the photodiode. Such requirements were resolved by the introduction of Samsung’s ISOCELL technology in 2013. ISOCELL forms a physical barrier between the neighbouring pixels, reducing colour crosstalk and expanding the full-well capacity. This enables each pixel to absorb and hold more light than the conventional backside-illuminated (BSI) image sensor design for superior image quality.

With the introduction of ISOCELL Plus, Samsung pushes pixel isolation technology to a new level through an optimized pixel architecture. In the existing pixel structure, metal grids are formed over the photodiodes to reduce interference between the pixels, which can also lead to some optical loss as metals tend to reflect and/or absorb the incoming light. For ISOCELL Plus, Samsung replaced the metal barrier with an innovative new material developed by Fujifilm, minimizing optical loss and light reflection.

The new ISOCELL Plus delivers higher colour fidelity along with up to a 15-percent enhancement in light sensitivity, according to the company. The technology also enables image sensors to equip 0.8-micrometer (µm) and smaller-sized pixels without any loss in performance, making it an optimal solution for developing super-resolution cameras with over 20 megapixels.

Samsung – www.samsung.com


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