Higher-resolution cameras don’t necessarily equate to better photos. “It’s a tradeoff question between the pixel size and resolution,” Girardin said. “Pixel scaling means that it has more pixels. When the resolution is more than 40MP and 50MP, the capabilities may be beyond the human eye to see what they capture. For CMOS image sensors, the pixel with a better quantum efficiency (QE) and a signal-to-noise ratio are the most important things for image quality.” pixel scaling ( from microns to sub microns pixel pitch), new technology breakthrough must be introduced challenges: pixel crosstalk diffraction low light sensitivity Technology enablers to make a taller photodiode ( thicker active Si layer) , DTI ( Deep Trench Isolation) VTG (Vertical Transfer Gate) buried CFA usually realised as Back side Illumination (BSI) configuration narrow metal grids for crosstalk suppression narrow dielectric wall for Quantum Efficiency improvement new process: high-k passiv