A next-generation, back-illuminated CMOS image sensor from Sony layers the pixel section containing formations of back-illuminated structure pixels onto chips containing the circuit section for signal processing. This is instead of supporting substrates for conventional back-illuminated CMOS image sensors. The company claims that this structure enhances image quality, functionalities and provides a more compact size that will lead to the evolution of cameras for smaller size, high pixel rate versions. The sensor has large-scale signal processing circuits required for higher image quality. It has also been developed using the company's RGBW Coding function, which facilitates low noise, high quality image capture even in low light condition, and the proprietary High Dynamic Range Movie function, which achieves brilliant colour even when taking pictures against bright light. Conventional CMOS image sensors mount the pixel section and analogue logic circuit on top of the same chip, which require numerous constraints, for example, to suppress noise and optimise the characteristics of pixels and circuit transistors. As the pixel section and circuit section are independent chips, a manufacturing process can enable the pixel section to be specialised for higher image quality and the circuit section for higher functionality.
