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In this paper, we describe a device structure and optical design for a CMOS image sensor with the phase-difference detection photodiodes (PD) for an autofocus (AF) function. This image sensor has a pixel separated into two PDs by a PN junction. All the effective pixels function as both the imaging and the phase-difference detection AF (PDAF). We have realized a low dark random noise (=1.8eat 1PD, 2.5eat 1pixel) and high sensitivity (=78,000e-/lx sec at 1green pixel) image sensor with the imaging and the PDAF functions in all the effective pixels. Introduction Recently, image sensors with the PDAF function at image plane has been developed [1], [2]. These realize the AF function by arranging exclusive pixels to detect the phase-difference. In these image sensors, a pair of partially light shielded PD is arranged in a part of pixel array. The focusing speed is extremely fast in comparison with conventional contrast detection AF. The sensitivity, however, is degraded by the light shielding structure and interpolation processing by neighboring pixels is necessary for image generation [2]. Therefore, the number of pixels for AF function is limited to avoid the deterioration of image quality. In this work, we developed an image sensor with the imaging and the PDAF functions in all the effective pixels without exclusive pixel for AF function. All the effective pixels have two PDs each to detect phase-difference in one pixel without partially light shielding structure. Therefore, one pixel works as one AF point, and the sum of two PD outputs equals one pixel output. Fig. 1: Principle of the PDAF function Principle Fig. 1 shows the principle of the PDAF function. Exit pupil of an optical lens and a PD of the image sensor are in optically conjugate relation by on-chip micro-lens (ML). Therefore, each pixel by separating into two PDs has the pupil split function for the PDAF function. A light flux which passes through a right half of the optical lens is led to the PD-A (the PD at left si of the optica side). Defocusing between th provided fro image-B (th The directi image-B is and the back These mea lens is drive defocusing a

[Paper] A Low Noise and High Sensitivity Image Sensor with Imaging and Phase-Difference Detection AF in All Pixels