Modeling and Investigation of Auto Focus Disparity Sensitivity for CMOS Image Sensors with Sub-Micrometer Scale Pixel Size

Modeling of simulation of auto focus (AF) disparity sensitivity for dual pixel CIS is conducted including module lens, pixel diffraction effect, and image signal processing. Additionally, investigation of the disparity sensitivity with respect to sub-micrometer scale pixel size are performed under the trend of reducing pixel size for high resolution. This methodology can be used to predict the AF performance from an imaging system perspective when scaling the pixel size below the subwavelength.