Image sensors, especially ones with small pixels like in smartphones, feature an on-chip micro lens array to help guide all the arriving light to the sensor's photo diode. Right now, each pixel gets its own lens, but Sony has developed a way for four adjacent pixels to share a lens. This is aimed at Quad Bayer sensors where the four pixels already share a color filter. Differences in the sensitivity of pixels prevented such designs, but Sony says it has figured it out and calls its technology 2x2 On-Chip Lens (OCL). The main advantage of this design seems to be improved...
Source: https://www.gsmarena.com/sony_unveils_2x2_onchip_lens_tech_for_quad_bayer_sensors_which_promises_better_af_performance-news-40523.php
