Light sensor

Patent Granted In optical devices such as a light sensor provided with a photodiode which generates optical charges by receiving light and a transfer transistor (or an overflow gate) which transfers optical charges, and a solid-state image pickup device, optical charges overflowed from the photodiode are stored in a plurality of storage capacitor elements during storing operation, through the transfer transistor or the overflow gate. Thus, the optical devices which maintain a high sensitivity and a high S/N ratio and have a wide dynamic range can be obtained